Some standard content:
ICS71.060.20
Registration No. 145—1997
Chemical Industry Standard of the People's Republic of China
HG/T2834—1997
Zine oxide for soft magnetic ferrites use1997-02-04 Issued
Ministry of Chemical Industry of the People's Republic of China
1997-10-01 Implementation
HG/T2834—1997
This standard is formulated according to the specifications of well-known foreign companies and with reference to domestic enterprise standards. Its technical requirements and test methods have reached the international level.
Compared with domestic enterprise standards, this standard adds four indicators: cadmium, nickel, chloride and apparent density. The content of cadmium and nickel in the newly added items shall be determined by flame atomic absorption spectrometry; the content of chloride shall be determined by limited turbidimetry; the apparent density shall be controlled according to bulk density and compactness respectively, the bulk density shall be determined by free fall method, and the compactness shall be determined by vibration method. This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Tianjin Chemical Research Institute of the Ministry of Chemical Industry. The drafting units of this standard are Tianjin Chemical Research Institute of the Ministry of Chemical Industry and Jiangsu Xinghua Zinc Oxide Factory. The main drafters of this standard are Lu Siwei, Li Guangming, Liu Zhenghe, Yang Heping and Sun Zhihong. This standard is entrusted to the technical unit responsible for standardization of inorganic salts of the Ministry of Chemical Industry for interpretation. I
1 Scope
Chemical Industry Standard of the People's Republic of China
Zine oxide for soft magnetic ferrites use
Zine oxide for soft magnetic ferrites useHG/T2834—1997
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of zinc oxide for soft magnetic ferrites. This standard applies to zinc oxide for soft magnetic ferrites produced by an indirect method. This product is mainly used in the electronics industry to manufacture deflection cores and other zinc-magnesium ferrite cores.
Molecular formula: Zno
Relative molecular mass: 81.38 (according to the 1993 international relative atomic mass) 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191-90
Pictorial markings for packaging, storage and transportation
GB/T601—88
GB/T602—88
GB/T 603—88
Preparation of standard solutions for titration analysis (volumetric analysis) Chemical reagents
Preparation of standard solutions for impurity determination (neqISO6353/1:1982) Chemical reagents
Preparation of preparations and products used in chemical reagent test methods (neqISO6353/1:1982) GB/T1250—89
9 Methods for expressing and determining limit values GB/T3185— 92 Zinc oxide (indirect method) GB/T6678-86 General rules for sampling of chemical products GB/T6682-92
GB/T8946-88
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987) Plastic woven bags
GB/T9723-88
3 Chemical reagents Flame atomic absorption spectrometry General rules 3 Requirements
3.1 Appearance: White light powder.
3.2 Zinc oxide used for soft ferrites shall meet the requirements of Table 1. Table 1 Requirements
Zinc oxide (Zno), %
Water-soluble matter content, %
Approved by the Ministry of Chemical Industry of the People's Republic of China on February 4, 1997
Qualified products
Implementation on October 1, 1997
Content of hydrochloric acid insoluble matter, %
Metallic zinc content, %
Loss on ignition, %
Chloride (as Cl) content, %
Lead (Pb) content ，%
Manganese (Mn) content，%
Copper (Cu) content，%
Cadmium (ca) content，%
Nickel (Ni) content，%
105℃ volatile matter，%
Compactness，g/mL
Apparent density
Bulk density，g/mL
Sieve residue (45um test sieve),%
4 Sampling
4.1 Each batch of products shall not exceed 20t.
HG/T2834—1997
Table 1 (end)
Qualified products
4.2 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678-86. When sampling, insert the sampler obliquely from the top of the packaging bag to 3/4 of the depth of the material layer for sampling. After mixing the collected samples, divide them into quarters to about 500g, and pack them into two clean and dry wide-mouth bottles with stoppers and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, grade, batch number, sampling date and name of the sampler. One bottle is used as a laboratory sample, and the other bottle is kept for three months for reference. 4.3 If one of the test results does not meet the requirements of this standard, re-samples should be taken from twice the amount of packaging for verification. If even one of the verification results does not meet the requirements of this standard, the entire batch of products will be unqualified. 5 Test methods
5.1 All fourteen indicators specified in this standard are type test items, of which zinc oxide, water-soluble matter, hydrochloric acid insoluble matter, ignition loss, chloride, apparent density, and sieve residue are routine test items and should be tested batch by batch. Under normal production conditions, type tests should be carried out at least once a month.
5.2 The rounded value comparison method specified in 5.2 of GB/T1250-89 shall be used to determine whether the test results meet the standard. 5.3 The reagents and water used in this standard, unless otherwise specified, refer to analytical pure reagents and grade 3 water specified in GB/T6682.
The standard titration solution, impurity standard solution, preparation and products used in the test, unless otherwise specified, shall be prepared in accordance with the provisions of 2
HG/T2834-1997
GB/T601, GB/T602 and GB/T603. 5.4 Determination of zinc oxide content
The method of 5.1 of GB/T3185-92 shall be followed. 5.5 Determination of water-soluble matter content
The method of 5.9 of GB/T3185-92 shall be followed. 5.6 Determination of hydrochloric acid insoluble matter
Perform according to the method of 5.6 of GB/T3185-92. 5.7 Determination of metallic zinc content
Perform according to the method of 5.2 of GB/T3185-92. 5.8 Determination of loss on ignition
Perform according to the method of 5.7 of GB/T3185-92. 5.9 Determination of chloride content
5.9.1 Summary of the method
In nitric acid medium, chloride ions and silver ions generate insoluble silver chloride. When the chloride ion content is low, the silver chloride will be suspended for a certain period of time, making the solution turbid, which can be used for the visual turbidimetric determination of chloride. 5.9.2 Reagents and materials
5.9.2.1 Nitric acid solution: 1+15
5.9.2.2 Silver nitrate solution: 17g/L;
5.9.2.3 Chloride standard solution: 1mL solution contains 0.01mgCl, prepared before use; use a pipette to transfer 10mL of the chloride standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute with water to the scale, and shake well.
5.9.3 Analysis steps
5.9.3.1 Preparation of test solution
Weigh about 1.0g of sample (accurate to 0.01g), place it in a 50mL beaker, add a small amount of water to moisten it, add 25mL nitric acid solution to completely dissolve the sample, transfer the solution to a 100mL volumetric flask, dilute to the scale, and shake well. 5.9.3.2 Analysis steps
Use a pipette to transfer 10mL of the test solution, place it in a 50mL colorimetric tube, add water to about 40mL, add 5mL of nitric acid solution, 1mL of silver nitrate solution, dilute with water to the scale, and shake well. Let it stand for 2 minutes, and the turbidity should not be deeper than that of the standard turbidimetric solution. Preparation of standard turbidimetric solution: Use a pipette to transfer 5mL (first-class) chloride standard solution and treat it in the same way as the test solution. 5.10 Determination of lead content
Perform according to method 5.3 of GB/T3185-92. 5.11 Determination of manganese content
Perform according to method 5.4 of GB/T3185-92. 5.12 Determination of copper content
Perform according to method 5.5 of GB/T3185-92. 5.13 Determination of cadmium content
5.13.1 Method summary
See Chapter 3 of GB/T9723-88.
5.13.2 Reagents and materials
5.13.2.1 Hydrochloric acid solution: 1+1;
5.13.2.2 Cadmium standard solution: 1mL solution contains 0.1mgCd. 5.13.3 Instruments and equipment
5.13.3.1 Atomic absorption spectrophotometer; 5.13.3.2 Light source: cadmium hollow cathode lamp; 5.13.3.3 Wavelength: 228.8nm;
5.13.3.4 Flame: acetylene-air.
5.13.4 Analysis steps
5.13.4.1 Preparation of test solution
HG/T2834—1997
Weigh about 5g of sample (accurate to 0.01g). Place in a 250mL beaker, add a small amount of water to moisten, add 50mL of hydrochloric acid solution, and heat to dissolve it completely. Transfer to a 250mL volumetric flask, dilute to the mark with water, and shake well. This is test solution A, which is used to determine the content of cadmium and nickel.
5.13.4.2 Determination
Use a pipette to transfer 10mL of test solution A (5.13.4.1), a total of four portions. Place each in a 100mL volumetric flask, and follow the steps in 6.2.2 of GB/T9723-88 starting from “.……·(1) portion without adding standard solution, ….…”. 5.13.5 Expression of analysis results
The cadmium (Cd) content X1 expressed as mass percentage is calculated according to formula (1): X,_X100×10-6
m×250
Wherein: c——the cadmium concentration obtained from the standard curve, g/mL; m——the mass of the sample referred to in 5.13.4.1, 8. 5.13.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.0005% for first-class products and 0.005% for qualified products.
5.14 Determination of nickel content
5.14.1 Summary of the method
See Chapter 3 of GB/T9723-88.
5.14.2 Reagents and materials
Nickel standard solution: 1 mL of solution contains 0.1 mg of Ni. 5.14.3 Instruments and equipment
5.14.3.1 Atomic absorption spectrophotometer; 5.14.3.2 Light source: nickel hollow cathode lamp; 5.14.3.3 Wavelength: 232.0 nm
5.14.3.4 Flame: acetylene-air.
5.14.4 Analysis steps
Use a pipette to transfer 10 mL of test solution A (5.13.4.1), a total of four portions. Place each in a 100 mL volumetric flask, and follow the following steps according to 6.2.2 of GB/T9723-88, starting from "(1) portion without adding standard solution." 5.14.5 Expression of analysis results
The nickel (Ni) content X2 expressed as mass percentage is calculated according to formula (2):4
Wherein: c-
HG/T2834—1997
cX100×10-6
-the nickel concentration found from the standard curve, ug/mL;-the mass of the sample stated in 5.13.4.1, g. 5.14.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.04%. 5.15 Determination of volatile matter content at 105℃
Carry out according to the method in 5.10 of GB/T3185-92. 5.16 Determination of apparent density
5.16.1 Bulk density
5.16.1.1 Summary of method
The sample falls freely through a funnel into a measuring cylinder of known mass and volume. After weighing and calculation, the bulk density (bulk density) of the sample is determined.
5.16.1.2 Instruments and equipment
Bulk density (bulk density) measuring instrument
As shown in the figure: The funnel is fixed on the bracket, and the measuring cylinder is located below the center line of the funnel, with a spacing of 30 mm. The material is organic glass. 1
1 Hopper: 2 baffle; 3 support; 4 measuring cup (500mL) Figure 1 Bulk density tester
5.16.1.3 Analysis steps
Within 1 minute, let the sample fall freely through the funnel into a measuring cylinder of known mass and volume. The top of the sample cone should be higher than the wall of the measuring cylinder. Use a ruler to scrape off the higher part and accurately weigh the measuring cylinder containing the sample (accurate to 0.01g). 5.16.1.4 Expression of analysis results
Bulk density X expressed as mass per unit volume: Calculate according to formula (3): 5
Where: m1-
-mass of sample and measuring cylinder, g;
mass of measuring cylinder, g;
V-volume of measuring cylinder, mL.
5.16.1.5 Allowable difference
HG/T2834—1997
_m1-m2×100
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.16.2 Compactness
5.16.2.1 Method Summary
In a measuring cylinder of a certain volume, add the sample to the specified volume, vibrate, add the sample to the specified volume, repeat several times, weigh the sample mass, and determine the compactness of the sample. 5.16.2.2 Instruments and equipment
Tightness tester
As shown in the figure:
1 Measuring cylinder (volume is 2501mL), 2 Stand, 3 Rubber pad Figure 2 Tightness tester
5.16.2.3 Analysis steps
Take enough sample and add it to the measuring cylinder of known mass through the funnel, add it to the 100mL mark, gently hold the upper part of the measuring cylinder with your hand, raise it to 50mm, let go and let the measuring cylinder fall on the stand, repeat the vibration once, then add the sample steadily, add it to the 200mL mark, raise the measuring cylinder to 50mm, shake it twice, and finally add the sample to the 250mL mark, and after shaking it twice at a height of 50mm, add the sample to the 250mL mark. Accurately weigh the measuring cylinder with the sample (accurate to 0.01g). 5.16.2.4 Expression of analysis results
The compactness X expressed as the mass per unit volume is calculated according to formula (4): m-m2×100
Wherein: m1——mass of the sample and measuring cylinder, g; m2——mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5 Allowable error
HG/T2834—1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.17 Determination of sieve residue content
Carry out according to the method in 5.8 of GB/T3185-92. 6 Marking, packaging, transportation, storage
6.1 The packaging bags of zinc oxide for soft ferrites should have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "wet-afraid" mark in GB191. 6.2 Each batch of zinc oxide for soft ferrites shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 6.3 The packaging of zinc oxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.04~0.08mm; the outer packaging is a plastic woven bag, and its performance and inspection methods should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 20kg. 6.4 When packaging soft ferrites with zinc oxide, the inner bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the mouth should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length should be not less than 10mm, the stitches should be neat and uniform, and there should be no leakage or skipping. 6.5 Zinc oxide for soft ferrites should be covered during transportation to prevent rain and moisture. 6.6 Zinc oxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture. 73.4 Flame: acetylene-air.
5.13.4 Analysis steps
5.13.4.1 Preparation of test solution
HG/T2834—1997
Weigh about 5g of sample (accurate to 0.01g). Place in a 250mL beaker, add a small amount of water to moisten, add 50mL of hydrochloric acid solution, and heat to dissolve it completely. Transfer to a 250mL volumetric flask, dilute to the mark with water, and shake well. This is test solution A, which is used to determine the content of cadmium and nickel.
5.13.4.2 Determination
Use a pipette to transfer 10mL of test solution A (5.13.4.1), a total of four portions. Place each in a 100mL volumetric flask, and follow the steps in 6.2.2 of GB/T9723-88 starting from “.……·(1) portion without adding standard solution, ….…”. 5.13.5 Expression of analysis results
The cadmium (Cd) content X1 expressed as mass percentage is calculated according to formula (1): X,_X100×10-6
m×250
Wherein: c——the cadmium concentration obtained from the standard curve, g/mL; m——the mass of the sample referred to in 5.13.4.1, 8. 5.13.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.0005% for first-class products and 0.005% for qualified products.
5.14 Determination of nickel content
5.14.1 Summary of the method
See Chapter 3 of GB/T9723-88.
5.14.2 Reagents and materials
Nickel standard solution: 1 mL of solution contains 0.1 mg of Ni. 5.14.3 Instruments and equipment
5.14.3.1 Atomic absorption spectrophotometer; 5.14.3.2 Light source: nickel hollow cathode lamp; 5.14.3.3 Wavelength: 232.0 nm
5.14.3.4 Flame: acetylene-air.
5.14.4 Analysis steps
Use a pipette to transfer 10 mL of test solution A (5.13.4.1), a total of four portions. Place each in a 100 mL volumetric flask, and follow the following operations according to 6.2.2 of GB/T9723-88, starting from "(1) portion without adding standard solution." 5.14.5 Expression of analysis results
The nickel (Ni) content X2 expressed as mass percentage is calculated according to formula (2):4
Wherein: c-
HG/T2834—1997
cX100×10-6
-the nickel concentration found from the standard curve, ug/mL;-the mass of the sample stated in 5.13.4.1, g. 5.14.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.04%. 5.15 Determination of volatile matter content at 105℃
Carry out according to the method in 5.10 of GB/T3185-92. 5.16 Determination of apparent density
5.16.1 Bulk density
5.16.1.1 Summary of method
The sample falls freely through a funnel into a measuring cylinder of known mass and volume. After weighing and calculation, the bulk density (bulk density) of the sample is determined.
5.16.1.2 Instruments and equipment
Bulk density (bulk density) measuring instrument
As shown in the figure: The funnel is fixed on the bracket, and the measuring cylinder is located below the center line of the funnel, with a spacing of 30 mm. The material is plexiglass. 1
1 Hopper: 2 baffle; 3 support; 4 measuring cup (500mL) Figure 1 Bulk density tester
5.16.1.3 Analysis steps
Within 1 minute, let the sample fall freely through the funnel into a measuring cylinder of known mass and volume. The top of the sample cone should be higher than the wall of the measuring cylinder. Use a ruler to scrape off the higher part and accurately weigh the measuring cylinder containing the sample (accurate to 0.01g). 5.16.1.4 Expression of analysis results
Bulk density X expressed as mass per unit volume: Calculate according to formula (3): 5
Where: m1-
-mass of sample and measuring cylinder, g;
mass of measuring cylinder, g;
V-volume of measuring cylinder, mL.
5.16.1.5 Allowable difference
HG/T2834—1997
_m1-m2×100
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.16.2 Compactness
5.16.2.1 Method Summary
In a measuring cylinder of a certain volume, add the sample to the specified volume, vibrate, add the sample to the specified volume, repeat several times, weigh the sample mass, and determine the compactness of the sample. 5.16.2.2 Instruments and equipment
Tightness tester
As shown in the figure:
1 Measuring cylinder (volume is 2501mL), 2 Stand, 3 Rubber pad Figure 2 Tightness tester
5.16.2.3 Analysis steps
Take enough sample and add it to the measuring cylinder of known mass through the funnel, add it to the 100mL mark, gently hold the upper part of the measuring cylinder with your hand, raise it to 50mm, let go and let the measuring cylinder fall on the stand, repeat the vibration once, then add the sample steadily, add it to the 200mL mark, raise the measuring cylinder to 50mm, shake it twice, and finally add the sample to the 250mL mark, and after shaking it twice at a height of 50mm, add the sample to the 250mL mark. Accurately weigh the measuring cylinder with the sample (accurate to 0.01g). 5.16.2.4 Expression of analysis results
The compactness X expressed as the mass per unit volume is calculated according to formula (4): m-m2×100
Wherein: m1——mass of the sample and measuring cylinder, g; m2——mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5 Allowable error
HG/T2834—1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.17 Determination of sieve residue content
Carry out according to the method in 5.8 of GB/T3185-92. 6 Marking, packaging, transportation, storage
6.1 The packaging bags of zinc oxide for soft ferrites should have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "wet-afraid" mark in GB191. 6.2 Each batch of zinc oxide for soft ferrites shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 6.3 The packaging of zinc oxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.04~0.08mm; the outer packaging is a plastic woven bag, and its performance and inspection methods should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 20kg. 6.4 When packaging soft ferrites with zinc oxide, the inner bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the mouth should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length should be not less than 10mm, the stitches should be neat and uniform, and there should be no leakage or skipping. 6.5 Zinc oxide for soft ferrites should be covered during transportation to prevent rain and moisture. 6.6 Zinc oxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture. 73.4 Flame: acetylene-air.
5.13.4 Analysis steps
5.13.4.1 Preparation of test solution
HG/T2834—1997
Weigh about 5g of sample (accurate to 0.01g). Place in a 250mL beaker, add a small amount of water to moisten, add 50mL of hydrochloric acid solution, and heat to dissolve it completely. Transfer to a 250mL volumetric flask, dilute to the mark with water, and shake well. This is test solution A, which is used to determine the content of cadmium and nickel.
5.13.4.2 Determination
Use a pipette to transfer 10mL of test solution A (5.13.4.1), a total of four portions. Place in 100mL volumetric flasks respectively, and follow the following operations according to 6.2.2 of GB/T9723-88 starting from ".……·(1) portion without adding standard solution, ….…". 5.13.5 Expression of analysis results
The cadmium (Cd) content X1 expressed as mass percentage is calculated according to formula (1): X,_X100×10-6
m×250
Wherein: c——the cadmium concentration obtained from the standard curve, g/mL; m——the mass of the sample referred to in 5.13.4.1, 8. 5.13.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.0005% for first-class products and 0.005% for qualified products.
5.14 Determination of nickel content
5.14.1 Summary of the method
See Chapter 3 of GB/T9723-88.
5.14.2 Reagents and materials
Nickel standard solution: 1 mL of solution contains 0.1 mg of Ni. 5.14.3 Instruments and equipment
5.14.3.1 Atomic absorption spectrophotometer; 5.14.3.2 Light source: nickel hollow cathode lamp; 5.14.3.3 Wavelength: 232.0 nm
5.14.3.4 Flame: acetylene-air.
5.14.4 Analysis steps
Use a pipette to transfer 10 mL of test solution A (5.13.4.1), a total of four portions. Place each in a 100 mL volumetric flask, and follow the following steps according to 6.2.2 of GB/T9723-88, starting from "(1) portion without adding standard solution." 5.14.5 Expression of analysis results
The nickel (Ni) content X2 expressed as mass percentage is calculated according to formula (2):4
Wherein: c-
HG/T2834—1997
cX100×10-6
-the nickel concentration found from the standard curve, ug/mL;-the mass of the sample stated in 5.13.4.1, g. 5.14.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.04%. 5.15 Determination of volatile matter content at 105℃
Carry out according to the method in 5.10 of GB/T3185-92. 5.16 Determination of apparent density
5.16.1 Bulk density
5.16.1.1 Summary of method
The sample falls freely through a funnel into a measuring cylinder of known mass and volume. After weighing and calculation, the bulk density (bulk density) of the sample is determined.
5.16.1.2 Instruments and equipment
Bulk density (bulk density) measuring instrument
As shown in the figure: The funnel is fixed on the bracket, and the measuring cylinder is located below the center line of the funnel, with a spacing of 30 mm. The material is organic glass. 1
1 Hopper: 2 baffle; 3 support; 4 measuring cup (500mL) Figure 1 Bulk density tester
5.16.1.3 Analysis steps
Within 1 minute, let the sample fall freely through the funnel into a measuring cylinder of known mass and volume. The top of the sample cone should be higher than the wall of the measuring cylinder. Use a ruler to scrape off the higher part and accurately weigh the measuring cylinder containing the sample (accurate to 0.01g). 5.16.1.4 Expression of analysis results
Bulk density X expressed as mass per unit volume: Calculate according to formula (3): 5
Where: m1-
-mass of sample and measuring cylinder, g;
mass of measuring cylinder, g;
V-volume of measuring cylinder, mL.
5.16.1.5 Allowable difference
HG/T2834—1997
_m1-m2×100
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.16.2 Compactness
5.16.2.1 Method Summary
In a measuring cylinder of a certain volume, add the sample to the specified volume, vibrate, add the sample to the specified volume, repeat several times, weigh the sample mass, and determine the compactness of the sample. 5.16.2.2 Instruments and equipment
Tightness tester
As shown in the figure:
1 Measuring cylinder (volume is 2501mL), 2 Stand, 3 Rubber pad Figure 2 Tightness tester
5.16.2.3 Analysis steps
Take enough sample and add it to the measuring cylinder of known mass through the funnel, add it to the 100mL mark, gently hold the upper part of the measuring cylinder with your hand, raise it to 50mm, let go and let the measuring cylinder fall on the stand, repeat the vibration once, then add the sample steadily, add it to the 200mL mark, raise the measuring cylinder to 50mm, shake it twice, and finally add the sample to the 250mL mark, and after shaking it twice at a height of 50mm, add the sample to the 250mL mark. Accurately weigh the measuring cylinder with the sample (accurate to 0.01g). 5.16.2.4 Expression of analysis results
The compactness X expressed as the mass per unit volume is calculated according to formula (4): m-m2×100
Wherein: m1——mass of the sample and measuring cylinder, g; m2——mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5 Allowable error
HG/T2834—1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.17 Determination of sieve residue content
Carry out according to the method in 5.8 of GB/T3185-92. 6 Marking, packaging, transportation, storage
6.1 The packaging bags of zinc oxide for soft ferrites should have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "wet-afraid" mark in GB191. 6.2 Each batch of zinc oxide for soft ferrites shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 6.3 The packaging of zinc oxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.04~0.08mm; the outer packaging is a plastic woven bag, and its performance and inspection methods should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 20kg. 6.4 When packaging soft ferrites with zinc oxide, the inner bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the mouth should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length should be not less than 10mm, the stitches should be neat and uniform, and there should be no leakage or skipping. 6.5 Zinc oxide for soft ferrites should be covered during transportation to prevent rain and moisture. 6.6 Zinc oxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture. 71. The mass of the sample referred to in 8. 5.13.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results is not more than 0.0005% for first-class products and not more than 0.005% for qualified products.
5.14 Determination of nickel content
5.14.1 Summary of the method
See Chapter 3 of GB/T9723-88.
5.14.2 Reagents and materials
Nickel standard solution: 1mL solution contains 0.1mgNi. 5.14.3 Instruments and equipment
5.14.3.1 Atomic absorption spectrophotometer; 5.14.3.2 Light source: nickel hollow cathode lamp; 5.14.3.3 Wavelength: 232.0nm
5.14.3.4 Flame: acetylene-air.
5.14.4 Analysis steps
Use a pipette to take 10mL of test solution A (5.13.4.1), a total of four portions. Place each portion in a 100mL volumetric flask. The following operations are carried out according to 6.2.2 of GB/T9723-88, starting from "(1) portion without adding standard solution". 5.14.5 Expression of analysis results
The nickel (Ni) content X2 expressed as mass percentage is calculated according to formula (2): 4
Where: c-
HG/T2834-1997
cX100×10-6
-the nickel concentration found from the standard curve, ug/mL; -the mass of the sample stated in 5.13.4.1, g. 5.14.6 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the parallel determination results shall not exceed 0.04%. 5.15 Determination of volatile matter content at 105℃
Perform according to the method in 5.10 of GB/T3185-92. 5.16 Determination of apparent density
5.16.1 Bulk density
5.16.1.1 Summary of method
The sample falls freely through a funnel into a measuring cylinder of known mass and volume. After weighing and calculation, the bulk density (bulk density) of the sample is determined.
5.16.1.2 Instruments and equipment
Bulk density (bulk density) measuring instrument
As shown in the figure: The funnel is fixed on the bracket, and the measuring cylinder is located below the center line of the funnel, with a spacing of 30 mm. The material is plexiglass. 1
1 Hopper: 2 baffle; 3 support; 4 measuring cup (500mL) Figure 1 Bulk density tester
5.16.1.3 Analysis steps
Within 1 minute, let the sample fall freely through the funnel into a measuring cylinder of known mass and volume. The top of the sample cone should be higher than the wall of the measuring cylinder. Use a ruler to scrape off the higher part and accurately weigh the measuring cylinder containing the sample (accurate to 0.01g). 5.16.1.4 Expression of analysis results
Bulk density X expressed as mass per unit volume: Calculate according to formula (3): 5
Where: m1-
-mass of sample and measuring cylinder, g;
mass of measuring cylinder, g;
V-volume of measuring cylinder, mL.
5.16.1.5 Allowable difference
HG/T2834—1997
_m1-m2×100
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.16.2 Compactness
5.16.2.1 Method Summary
In a measuring cylinder of a certain volume, add the sample to the specified volume, vibrate, add the sample to the specified volume, repeat several times, weigh the sample mass, and determine the compactness of the sample. 5.16.2.2 Instruments and equipment
Tightness tester
As shown in the figure:
1 Measuring cylinder (volume is 2501mL), 2 Stand, 3 Rubber pad Figure 2 Tightness tester
5.16.2.3 Analysis steps
Take enough sample and add it to the measuring cylinder of known mass through the funnel, add it to the 100mL mark, gently hold the upper part of the measuring cylinder with your hand, raise it to 50mm, let go and let the measuring cylinder fall on the stand, repeat the vibration once, then add the sample steadily, add it to the 200mL mark, raise the measuring cylinder to 50mm, shake it twice, and finally add the sample to the 250mL mark, and after shaking it twice at a height of 50mm, add the sample to the 250mL mark. Accurately weigh the measuring cylinder with the sample (accurate to 0.01g). 5.16.2.4 Expression of analysis results
The compactness X expressed as the mass per unit volume is calculated according to formula (4): m-m2×100
Wherein: m1——mass of the sample and measuring cylinder, g; m2——mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5 Allowable error
HG/T2834—1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.17 Determination of sieve residue content
Carry out according to the method in 5.8 of GB/T3185-92. 6 Marking, packaging, transportation, storage
6.1 The packaging bags of zinc oxide for soft ferrites should have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "wet-afraid" mark in GB191. 6.2 Each batch of zinc oxide for soft ferrites shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 6.3 The packaging of zinc oxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.04~0.08mm; the outer packaging is a plastic woven bag, and its performance and inspection methods should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 20kg. 6.4 When packaging soft ferrites with zinc oxide, the inner bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the mouth should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length should be not less than 10mm, the stitches should be neat and uniform, and there should be no leakage or skipping. 6.5 Zinc oxide for soft ferrites should be covered during transportation to prevent rain and moisture. 6.6 Zinc oxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture. 71. The mass of the sample referred to in 8. 5.13.6 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results is not more than 0.0005% for first-class products and not more than 0.005% for qualified products.
5.14 Determination of nickel content
5.14.1 Summary of the method
See Chapter 3 of GB/T9723-88.
5.14.2 Reagents and materials
Nickel standard solution: 1mL solution contains 0.1mgNi. 5.14.3 Instruments and equipment
5.14.3.1 Atomic absorption spectrophotometer; 5.14.3.2 Light source: nickel hollow cathode lamp; 5.14.3.3 Wavelength: 232.0nm
5.14.3.4 Flame: acetylene-air.
5.14.4 Analysis steps
Use a pipette to take 10mL of test solution A (5.13.4.1), a total of four portions. Place each portion in a 100mL volumetric flask. The following operations are carried out according to 6.2.2 of GB/T9723-88, starting from "(1) portion without adding standard solution". 5.14.5 Expression of analysis results
The nickel (Ni) content X2 expressed as mass percentage is calculated according to formula (2): 4
Where: c-
HG/T2834-1997
cX100×10-6
-the nickel concentration found from the standard curve, ug/mL; -the mass of the sample stated in 5.13.4.1, g. 5.14.6 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference between the parallel determination results shall not exceed 0.04%. 5.15 Determination of volatile matter content at 105℃
Perform according to the method of 5.10 of GB/T3185-92. 5.16 Determination of apparent density
5.16.1 Bulk density
5.16.1.1 Summary of method
The sample falls freely through a funnel into a measuring cylinder of known mass and volume. After weighing and calculation, the bulk density (bulk density) of the sample is determined.
5.16.1.2 Instruments and equipment
Bulk density (bulk density) measuring instrument
As shown in the figure: The funnel is fixed on the bracket, and the measuring cylinder is located below the center line of the funnel, with a spacing of 30 mm. The material is plexiglass. 1
1 Hopper: 2 baffle; 3 support; 4 measuring cup (500mL) Figure 1 Bulk density tester
5.16.1.3 Analysis steps
Within 1 minute, let the sample fall freely through the funnel into a measuring cylinder of known mass and volume. The top of the sample cone should be higher than the wall of the measuring cylinder. Use a ruler to scrape off the higher part and accurately weigh the measuring cylinder containing the sample (accurate to 0.01g). 5.16.1.4 Expression of analysis results
Bulk density X expressed as mass per unit volume: Calculate according to formula (3): 5
Where: m1-
-mass of sample and measuring cylinder, g;
mass of measuring cylinder, g;
V-volume of measuring cylinder, mL.
5.16.1.5 Allowable difference
HG/T2834—1997
_m1-m2×100
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.16.2 Compactness
5.16.2.1 Method Summary
In a measuring cylinder of a certain volume, add the sample to the specified volume, vibrate, add the sample to the specified volume, repeat several times, weigh the sample mass, and determine the compactness of the sample. 5.16.2.2 Instruments and equipment
Tightness tester
As shown in the figure:
1 Measuring cylinder (volume is 2501mL), 2 Stand, 3 Rubber pad Figure 2 Tightness tester
5.16.2.3 Analysis steps
Take enough sample and add it to the measuring cylinder of known mass through the funnel, add it to the 100mL mark, gently hold the upper part of the measuring cylinder with your hand, raise it to 50mm, let go and let the measuring cylinder fall on the stand, repeat the vibration once, then add the sample steadily, add it to the 200mL mark, raise the measuring cylinder to 50mm, shake it twice, and finally add the sample to the 250mL mark, and after shaking it twice at a height of 50mm, add the sample to the 250mL mark. Accurately weigh the measuring cylinder with the sample (accurate to 0.01g). 5.16.2.4 Expression of analysis results
The compactness X expressed as the mass per unit volume is calculated according to formula (4): m-m2×100
Wherein: m1——mass of the sample and measuring cylinder, g; m2——mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5 Allowable error
HG/T2834—1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.17 Determination of sieve residue content
Carry out according to the method in 5.8 of GB/T3185-92. 6 Marking, packaging, transportation, storage
6.1 The packaging bags of zinc oxide for soft ferrites should have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "wet-afraid" mark in GB191. 6.2 Each batch of zinc oxide for soft ferrites shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 6.3 The packaging of zinc oxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.04~0.08mm; the outer packaging is a plastic woven bag, and its performance and inspection methods should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 20kg. 6.4 When packaging soft ferrites with zinc oxide, the inner bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the mouth should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length should be not less than 10mm, the stitches should be neat and uniform, and there should be no leakage or skipping. 6.5 Zinc oxide for soft ferrites should be covered during transportation to prevent rain and moisture. 6.6 Zinc oxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture. 72 Instruments and equipment
Bulk density (bulk density) tester
As shown in the figure: the funnel is fixed on the bracket, and the measuring cylinder is located below the center line of the funnel, with a spacing of 30mm. The material is organic glass. 1
1 Hopper: 2 Baffle; 3 Bracket; 4 Measuring cup (500mL) Figure 1 Bulk density tester
5.16.1.3 Analysis steps
Within 1 minute, let the sample fall freely through the funnel into a measuring cylinder with known mass and volume. The cone top of the sample should be higher than the wall of the measuring cylinder. Use a ruler to scrape off the higher part and accurately weigh the measuring cylinder containing the sample (accurate to 0.01g). 5.16.1.4 Expression of analysis results
Bulk density X expressed as mass per unit volume: Calculate according to formula (3): 5
Wherein: m1-
-mass of the sample and the measuring cylinder, g;
mass of the measuring cylinder, g;
V-volume of the measuring cylinder, mL.
5.16.1.5 Allowable difference
HG/T2834—1997
_m1-m2×100
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.16.2 Compactness
5.16.2.1 Summary of method
In a measuring cylinder of a certain volume, add the sample to the specified volume. After vibration, add the sample to the specified volume. Repeat this process several times. Weigh the sample and determine its compactness. 5.16.2.2 Instruments and equipment
Tightness tester
As shown in the figure:
1 Measuring cylinder (volume is 2501mL), 2 Stand, 3 Rubber pad Figure 2 Tightness tester
5.16.2.3 Analysis steps
Take enough sample and add it to the measuring cylinder of known mass through the funnel, add it to the 100mL mark, gently hold the upper part of the measuring cylinder with your hand, raise it to 50mm, let go and let the measuring cylinder fall on the stand, repeat the vibration once, then add the sample steadily, add it to the 200mL mark, raise the measuring cylinder to 50mm, shake it twice, and finally add the sample to the 250mL mark, and after shaking it twice at a height of 50mm, add the sample to the 250mL mark. Accurately weigh the measuring cylinder with the sample (accurate to 0.01g). 5.16.2.4 Expression of analysis results
The compactness X expressed as the mass per unit volume is calculated according to formula (4): m-m2×100
Wherein: m1——mass of the sample and measuring cylinder, g; m2——mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5 Allowable error
HG/T2834—1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.17 Determination of sieve residue content
Carry out according to the method in 5.8 of GB/T3185-92. 6 Marking, packaging, transportation, storage
6.1 The packaging bags of zinc oxide for soft ferrites should have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "wet-afraid" mark in GB191. 6.2 Each batch of zinc oxide for soft ferrites shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 6.3 The packaging of zinc oxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.04~0.08mm; the outer packaging is a plastic woven bag, and its performance and inspection methods should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 20kg. 6.4 When packaging soft ferrites with zinc oxide, the inner bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the mouth should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length should be not less than 10mm, the stitches should be neat and uniform, and there should be no leakage or skipping. 6.5 Zinc oxide for soft ferrites should be covered during transportation to prevent rain and moisture. 6.6 Zinc oxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture. 72 Instruments and equipment
Bulk density (bulk density) tester
As shown in the figure: the funnel is fixed on the bracket, and the measuring cylinder is located below the center line of the funnel, with a spacing of 30mm. The material is organic glass. 1
1 Hopper: 2 Baffle; 3 Bracket; 4 Measuring cup (500mL) Figure 1 Bulk density tester
5.16.1.3 Analysis stepsWww.bzxZ.net
Within 1 minute, let the sample fall freely through the funnel into a measuring cylinder with known mass and volume. The cone top of the sample should be higher than the wall of the measuring cylinder. Use a ruler to scrape off the higher part and accurately weigh the measuring cylinder containing the sample (accurate to 0.01g). 5.16.1.4 Expression of analysis results
Bulk density X expressed as mass per unit volume: Calculate according to formula (3): 5
Wherein: m1-
-mass of sample and measuring cylinder, g;
mass of measuring cylinder, g;
V-volume of measuring cylinder, mL.
5.16.1.5 Allowable difference
HG/T2834—1997
_m1-m2×100
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.16.2 Compactness
5.16.2.1 Summary of method
In a measuring cylinder of a certain volume, add the sample to the specified volume. After vibration, add the sample to the specified volume. Repeat this process several times. Weigh the sample and determine its compactness. 5.16.2.2 Instruments and equipment
Tightness tester
As shown in the figure:
1 Measuring cylinder (volume is 2501mL), 2 Stand, 3 Rubber pad Figure 2 Tightness tester
5.16.2.3 Analysis steps
Take enough sample and add it to the measuring cylinder of known mass through the funnel, add it to the 100mL mark, gently hold the upper part of the measuring cylinder with your hand, raise it to 50mm, let go and let the measuring cylinder fall on the stand, repeat the vibration once, then add the sample steadily, add it to the 200mL mark, raise the measuring cylinder to 50mm, shake it twice, and finally add the sample to the 250mL mark, and after shaking it twice at a height of 50mm, add the sample to the 250mL mark. Accurately weigh the measuring cylinder with the sample (accurate to 0.01g). 5.16.2.4 Expression of analysis results
The compactness X expressed as the mass per unit volume is calculated according to formula (4): m-m2×100
Wherein: m1——mass of the sample and measuring cylinder, g; m2——mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5 Allowable error
HG/T2834—1997
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02g/mL. 5.17 Determination of sieve residue content
Carry out according to the method in 5.8 of GB/T3185-92. 6 Marking, packaging, transportation, storage
6.1 The packaging bags of zinc oxide for soft ferrites should have firm and clear markings, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "wet-afraid" mark in GB191. 6.2 Each batch of zinc oxide for soft ferrites shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality meets this standard and this standard number. 6.3 The packaging of zinc oxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.04~0.08mm; the outer packaging is a plastic woven bag, and its performance and inspection methods should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 20kg. 6.4 When packaging soft ferrites with zinc oxide, the inner bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the mouth should be sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitch length should be not less than 10mm, the stitches should be neat and uniform, and there should be no leakage or skipping. 6.5 Zinc oxide for soft ferrites should be covered during transportation to prevent rain and moisture. 6.6 Zinc oxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture. 7
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