Some standard content:
ICS71.060.20
Registration No. 146—1997
Chemical Industry Standard of the People's Republic of China
HG/T2835—1997
Mangano-Manganic Oxide for Soft Magnetic Ferrites Use1997-02-04 Issued
Ministry of Chemical Industry of the People's Republic of China
1997-10-01 Implementation
WHG/T2835—1997
This standard is formulated according to the specifications of well-known foreign companies and with reference to domestic enterprise standards. The technical requirements and test methods have reached the international advanced level.
Compared with domestic enterprise standards, this standard adds three indicators: sulfate, sieve residue and bulk density. The sulfate content adopts the visual colorimetric method, the sieve residue adopts the test sieve, and the bulk density adopts the free fall 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, Hunan Chemical Reagent General Factory, Nanjing Magnetic Material Factory of Ma'anshan Mining Research Institute.
The main drafters of this standard are Lu Siwei, Li Guangming, Yin Zhaowu, Lin Li, Li Zhijun, and Zhang Ye. This standard is entrusted to the technical unit responsible for inorganic salt standardization of the Ministry of Chemical Industry for interpretation. 1
W.bzsoso.con Chemical Industry Standard of the People's Republic of China
Mangano-Manganic Oxide for Soft Magnetic Ferrites
Mangano-Manganic Oxide for Soft Magnetic Ferritesuse1 Scope
HG/T2835—1997
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation, and storage of manganese tetraoxide for soft magnetic ferrites.
This standard applies to manganese tetraoxide for soft magnetic iron oxide made from manganese metal or manganese compounds. This product is mainly used in the manufacture of soft magnetic ferrite cores in the electronics industry. Molecular formula: Mn0
Relative molecular mass: 228.81 (according to the 1993 international relative atomic mass) 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T601—88 Chemical reagents
Preparation of standard solutions for titration analysis (volume analysis) GB/T602—88
Chemical reagents
Preparation of standard solutions for impurity determination (neqISO6353/1:1982) Preparation of preparations and products used in test methods (neqISo6353/1:1982) GB/T603—88
Chemical reagents
GB/T1250—89||tt| |9Expression and determination methods of limit values 5Test sieves
GB/T6003—85
GB/T6678—86
6General 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 bagsbZxz.net
8General rules for flame atomic absorption spectrometry of chemical reagents GB/T 9723—88
GB/T13390—92Determination of specific surface area of metal powdersNitrogen adsorption method 3Requirements
3.1Appearance: brownish red or brown crystalline powder. 3.2Manganese tetraoxide used for soft ferrites shall meet the requirements of Table 1. Approved by the Ministry of Chemical Industry of the People's Republic of China on February 4, 1997 and implemented on October 1, 1997
ww.bzsoso:com Manganese (Mn) content, %
Silicon dioxide (SiO2) content, %
Potassium (K) content, %
Sodium (Na) content, %
Calcium (Ca) content, %
Magnesium (Mg) content, %
Lead (Pb) content, %
Sulfate (in So.) content, %
Specific surface area, m2/g
Sieve residue (45um test sieve), %
Bulk density, g/mL
4 Sampling
4.1 Each batch of products shall not exceed 10t.
HG/T2835—1997
Table 1 Requirements
Superior products
First-class products
Qualified products
4.2 Determine the number of sampling units according to 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 to take samples. After mixing the collected samples, reduce them to about 500g by quartering method, and divide them into two clean and dry wide-mouth bottles with stoppers and seal them. Labels are attached to 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 future reference. 4.3 If any indicator of the test results does not meet the requirements of this standard, re-sampling should be carried out from twice the amount of packaging for verification. If even one indicator 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 the products listed in this standard Eleven indicators are type test items, of which eight indicators, namely manganese, silicon dioxide, potassium, sodium, calcium, magnesium, lead and sulfate, are routine test items and should be tested batch by batch. Under normal production conditions, type tests should be carried out at least once every three months.
5.2 Determine whether the test results meet the standards by the rounded value comparison method specified in 5.2 of GB/T1250-89. 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 product used in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603.
5.4 Determination of manganese content
5.4.1 Summary of the method
W.bzsos o.coDHG/T2835—1997
The sample is dissolved in hydrochloric acid, triethanolamine and hydroxylamine hydrochloride are used as masking agents, EDTA forms a stable complex with manganese ions under alkaline conditions, and chrome black T is used as an indicator to titrate the manganese content by titration. 5.4.2 Reagents and materials
5.4.2.1 Hydrogen peroxide;
5.4.2.2 Hydrochloric acid solution: 1+4;||tt ||5.4.2.3 Ammonia solution: 1+2.5;
Triethanolamine solution: 1+1;
Hydroxylamine hydrochloride solution: 1g/L;
5.4.2.6 Ammonia-ammonium chloride buffer solution (pH~10);5.4.2.7 Ethylenediaminetetraacetic acid disodium standard titration solution: c (EDTA) ~0.05mol/L;5.4.2.8 Chrome black T indicator solution: 5g/L.
5.4.3 Analysis steps
Weigh about 0.1g of sample (accurate to 0.0002g), place it in a 250mL conical flask, moisten it with a small amount of water, add 6mL of hydrochloric acid solution, heat to dissolve the sample completely, add 1 drop of hydrogen peroxide to fade the color, cool it, add 100mL of water, 6mL of ammonia solution, 5mL of triethanolamine solution and 5mL of hydroxylamine hydrochloride solution, and shake well. Add 10mL of ammonia-ammonium chloride buffer solution and 5 drops of chrome black T indicator solution, and shake well. Titrate with disodium ethylenediaminetetraacetic acid standard titration solution until the test solution turns pure blue, which is the end point. 5.4.4 Expression of analytical results
The manganese (Mn) content X expressed as mass percentage is calculated according to formula (1): X1 = V·cX 0. 054 93 × 100
Wherein, V is the volume of disodium ethylenediaminetetraacetic acid standard titration solution consumed in titrating the test solution, mL; c is the actual concentration of disodium ethylenediaminetetraacetic acid standard titration solution, mol/L; m is the mass of the sample, g;
0.05493 is the mass of manganese expressed in grams equivalent to 1.00mL disodium ethylenediaminetetraacetic acid standard titration solution [cEDTA) = 1.000mol/L].
5.4.5 Allowable difference
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 0.2%. 5.5 Determination of silicon dioxide content
5.5.1 Method Summary
Add hydrofluoric acid to the sample treated under certain conditions to convert the silicon dioxide in the sample into silicon tetrafluoride, burn it at high temperature until constant weight, and determine the silicon dioxide content based on the reduced mass of the sample. 5.5.2 Reagents and Materials
5.5.2.1 Hydrogen peroxide;
5.5.2.2 Hydrochloric acid solution: 1+4;
5.5.2.3 Hydrochloric acid solution: 1+9;
5.5.2.4 Hydrochloric acid solution: 1+65;
5.5.2.5 Sulfuric acid solution: 1+1;
5.5.2.6 Hydrofluoric acid solution: 1+2.5;
5.5.3 Instruments and Equipment
High temperature furnace: the temperature can be controlled at 1000~1100℃. 5.5.4 Analysis steps
WHG/T2835—1997
Weigh about 30g of sample (accurate to 0.1g), place in a 300mL beaker, moisten with a small amount of water, add 60mL of hydrochloric acid solution (5.5.2.2), heat to dissolve the sample completely, add 5 to 10 drops of hydrogen peroxide to fade the color, place in a boiling water bath to evaporate, and cool. Dissolve the residue with 50mL of hydrochloric acid solution (5.5.2.3), add water to 200mL, filter with slow quantitative filter paper, wash the precipitate with hot hydrochloric acid solution (5.5.2.4), and then wash with hot water until neutral. Transfer the precipitate and the filter paper to platinum and ash at low temperature. Place in a high-temperature furnace, burn to constant weight at 1000℃, and weigh. Then add 34 drops of sulfuric acid solution and 5 mL of hydrofluoric acid solution to the weighed platinum, heat on an electric hot plate in a fume hood until white smoke is gone, and burn in a high-temperature furnace at 1000°C to constant weight. 5.5.5 Expression of analysis results
The silicon dioxide (SiO2) content X2 expressed as mass percentage is calculated according to formula (2): X.-m=\2×100..
Where: m1—mass of the platinum crucible and residue before adding hydrofluoric acid, g; m2—mass of the platinum crucible and residue after adding hydrofluoric acid, g; m——mass of the sample, g.
5.5.6 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.002%. 5.6 Determination of potassium content
5.6.1 Summary of the method
Same as Chapter 3 of GB/T9723-88.
5.6.2 Reagents and materials
5.6.2.1 Hydrogen peroxide;
5.6.2.2 Hydrochloric acid solution: 1+4;
5.6.2.3 Potassium standard solution: 1mL solution contains 0.1mgK. 5.6.3 Instruments and equipment
5.6.3.1 Atomic absorption spectrophotometer;
5.6.3.2 Light source: potassium hollow cathode lamp;
5.6.3.3 Wavelength: 766.5nm;
5.6.3.4 Flame: acetylene-air.
5.6.4 Analysis steps
5.6.4.1 Preparation of test solution
Weigh about 25g 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. Add 5 drops of hydrogen peroxide to fade the color. 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 potassium, sodium, calcium, magnesium, and lead. 5.6.4.2 Determination
Use a pipette to transfer 10mL of test solution A (5.6.4.1), 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, ……." 5.6.5 Expression of analysis results
Potassium (K) content X expressed as mass percentage: calculated according to formula (3): 4
W.bzsoso.coIHG/T2835-1997
X- cX100×10-6
m×250
-. ×0.25
Wherein: c--potassium concentration found from the standard curve, ug/mL; m
-mass of the sample stated in 5.6.4.1, 8. 5.6.6 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.0005% for superior products, and not exceed 0.005% for standard products and qualified products.
5.7 Determination of sodium content
5.7.1 Summary of the method
Same as Chapter 3 of GB/T9723-88.
5.7.2 Reagents and materials
Sodium standard solution: 1 mL of solution contains 0.1 mg of Na. 5.7.3 Instruments and equipment
5.7.3.1 Atomic absorption spectrophotometer;
5.7.3.2 Light source: sodium hollow cathode lamp;
5.7.3.3 Wavelength: 588.9 nm
5.7.3.4 Flame: acetylene-air.
5.7.4 Analysis steps
Use a pipette to take 10 mL of test solution A (5.6.4.1), four times in total. Place them in 100mL volumetric flasks respectively, and perform the following operations according to 6.2.2 of GB/T9723-88 starting from “..···(1) parts without adding standard solution, …”. 5.7.5 Expression of analysis results
The sodium (Na) content X expressed as mass percentage is calculated according to formula (4): X, = X100 × 10-6
m×250
where c is the sodium concentration found from the standard curve, ug/mL; - the mass of the sample stated in 5.6.4.1, 8. m
5.7.6 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 0.004%. 5.8 Determination of calcium content
5.8.1 Summary of the method
Same as Chapter 3 of GB/T9723-88.
5.8.2 Reagents and materials
Calcium standard solution: 1 mL of solution contains 0.1 mg Ca. (4)
W.5.8.3 Instruments and equipment
5.8.3.1 Atomic absorption spectrophotometer;
5.8.3.2 Light source: calcium hollow cathode lamp;
5.8.3.3 Wavelength: 422.7 nm;
5.8.3.4 Flame: acetylene-air.
5.8.4 Analysis steps
HG/T2835-1997
Use a pipette to take 10 mL of test solution A (5.6.4.1), a total of four portions. Place in 100mL volumetric flasks respectively, and proceed as follows from 6.2.2 of GBT9723-88, starting from "(1) without adding standard solution." 5.8.5 Expression of analytical results
Calcium (Ca) content X expressed as mass percentage. Calculate according to formula (5): Xg=×100×10-6
m×250
Where: c——Calcium concentration obtained from the standard curve, ug/mL; m
-The mass of the sample stated in 5.6.4.1, 8. 5.8.6 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.004%. 5.9 Determination of magnesium content
5.9.1 Summary of method
Same as Chapter 3 of GB/T9723-88.
5.9.2 Reagents and materials
Magnesium standard solution: 1 mL of solution contains 0.1 mg Mg. 5.9.3 Instruments and equipment
5.9.3.1 Atomic absorption spectrophotometer;
5.9.3.2 Light source: magnesium hollow cathode lamp;
5.9.3.3 Wavelength: 285.2 nm,
5.9.3.4 Flame: acetylene-air.
5.9.4 Analysis steps
Use a pipette to take 5 mL of test solution A (5.6.4.1), a total of four portions. Place each in a 100 mL volumetric flask, and follow the following steps according to 6.2.2 of GBT9723-88, starting from "... (1) portion without adding standard solution." 5.9.5 Expression of analysis results
Magnesium (Mg) content X expressed as mass percentage. Calculate according to formula (6): X. = ×100 ×10- × 100
m×250
WHG/T2835—1997
Where: o—
-Mg concentration obtained from the standard curve, ug/mL; m
-Mass of the sample stated in 5.6.4.1, g. 5.9.6 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 superior products, and not more than 0.005% for standard products and qualified products.
5.10 Determination of lead content
5.10.1 Summary of the method
Same as Chapter 3 of GB/T9723-88.
5.10.2 Reagents and materials
Lead standard solution: 1mL solution contains 0.1mgPb. 5.10.3 Instruments and equipment
5.10.3.1 Atomic absorption spectrophotometer; 5.10.3.2 Light source: lead hollow cathode lamp; 5.10.3.3 Wavelength: 283.3nm;
5.10.3.4 Flame: acetylene-air.
5.10.4 Analysis steps
Use a pipette to transfer 20mL of test solution A (5.6.4.1), a total of four portions. Place each in a 100mL volumetric flask, and follow the following operations according to 6.2.2 of GB/T9723-88, starting from "(1) portion without adding standard solution". 5.10.5 Expression of analysis results
The lead (Pb) content X expressed as mass percentage is calculated according to formula (7): X, = × 100 × 10-6
m × 250
Where: c - the lead concentration found from the standard curve, ug/mL; - the mass of the sample stated in 5.6.4.1, 8. m
5.10.6 Tolerance
(7)
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results shall not exceed 0.0005% for superior and first-class products, and 0.005% for qualified products. 5.11 Determination of sulfate content
5.11.1 Method summary
In an acidic medium, sulfate ions and barium ions generate insoluble barium sulfate. When the sulfate ion content is low, barium sulfate will be suspended for a certain period of time, making the solution turbid. It can be used for the visual turbidimetric determination of sulfate. 5.11.2 Reagents and materials
5.11.2.1 Hydrogen peroxide;
5.11.2.2 Hydrochloric acid solution: 1+4
5.11.2.3 Cyclopentane solution: 250g/L; 5.11.2.4 Sulfate standard solution: 1mL of solution contains 0.01mgSO4. Prepare before use: Pipette 10mL of sulfate standard solution prepared according to GB/T602 into a 100mL volumetric flask, dilute to the scale with water, and shake well.
W.bzsoso.coI5.11.3 Analysis steps
5.11.3.1 Preparation of test solution
HG/T2835—1997
Weigh about 1g of sample (accurate to 0.01g), place in a 50mL beaker, add a small amount of water to moisten, add 10mL of hydrochloric acid solution to completely dissolve the sample, add hydrogen peroxide to fade the color, and evaporate to dryness on a water bath. Dissolve the residue with water, transfer the solution to a 100mL volumetric flask, dilute to the scale, and shake well.
5.11.3.2 Determination
Use a pipette to transfer 20mL of the test solution, place in a 50mL colorimetric tube, add water to about 10mL, add 1mL of hydrochloric acid solution, 1mL of barium chloride solution, dilute to the scale with water, and shake well. Let stand for 5min, and the turbidity should not be greater than that of the standard turbidity solution. Preparation of standard turbidity solution: Use a pipette to transfer 4mL (superior product) and 6mL (first-class product) of sulfate standard solution, and treat it in the same way as the test solution.
5.12 Determination of specific surface area
Determine according to GB/T13390.
5.13 Determination of sieve residue content
5.13.1 Instruments and equipment
5.13.1.1 Test sieve: R40/3 series in accordance with GB/T6003-85, Φ75mm×50mm/45μm5.13.1.2 Soft brush;
5.13.1.3 Electric oven: The temperature can be controlled at 105~110℃. 5.13.2 Analysis steps
Weigh about 10g of sample (accurate to 0.01g). Place the sample on a test sieve that has been pre-weighted, wet the sample with water, immerse the lower part of the test sieve in water, and gently scrub it with a soft brush. Replace the water as appropriate until the water is clear and there is no sample on the soft brush. Then rinse the test sieve and the soft brush twice with water. Place the test sieve in an electric oven and dry it at 105-110℃ until it reaches constant weight. 5.13.3 Expression of analysis results
Sieve residue X expressed as mass percentage. Calculate according to formula (8): =ml×100
Where: m1——mass of sieve residue, g; m——mass of sample, g.
5.14 Determination of bulk density
5.14.1 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 of the sample is determined. 5.14.2 Instruments and equipment
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 30 mm. The material is organic glass. 8
W.bzsoso.coI5.14.3 Analysis steps
HG/T2835-1997
1-hopper: 2-baffle; 3-bracket; 4-measuring cup (250mL) Figure 1 Bulk density tester
Within 1m, let the sample fall freely through the funnel into a measuring cylinder with 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). 5.14.4 Expression of analysis results
Bulk density X expressed as mass per unit volume. Calculate according to formula (9): Xg = ml = m2 × 100
Where: ml
-mass of the sample and the measuring cylinder, g;
-mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5.14.5 Allowable difference
The arithmetic mean of the results of parallel determinations shall be taken as the determination result. The absolute difference of the results of parallel determinations shall not exceed 0.02g/mL. 6 Marking, packaging, transportation, storage
(9)
6.1 The packaging bags of manganese tetraoxide for soft ferrites shall be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, and number of this standard. 6.2 Each batch of manganese tetraoxide for soft ferrites shall 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 complies with this standard and the number of this standard. 6.3 The packaging of manganese tetraoxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.40.8mm; the outer packaging is a plastic woven bag, and its performance and inspection method should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 25kg, 50kg or the packaging specifications can be determined according to user requirements. 6.4 The inner bag of manganese tetraoxide for soft ferrites is manually tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the opening is 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 is not less than 10mm, the stitches are neat and the stitch length is uniform. There is no leakage or skipping. 6.5 Manganese tetraoxide for soft ferrites should be covered during transportation to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.
HG/T2835—1997
Manganese tetraoxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.2. Start the operation from "(1) without adding standard solution". 5.10.5 Expression of analysis results
The lead (Pb) content X expressed as mass percentage is calculated according to formula (7): X, = × 100 × 10-6
m × 250
Where: c - the lead concentration found from the standard curve, ug/mL; - the mass of the sample mentioned in 5.6.4.1, 8. m
5.10.6 Allowable difference
(7)
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 superior and first-class products, and not exceed 0.005% for qualified products. 5.11 Determination of sulfate content
5.11.1 Method summary
In an acidic medium, sulfate ions and barium ions generate insoluble barium sulfate. When the sulfate ion content is low, barium sulfate will be suspended for a certain period of time, making the solution turbid. It can be used for visual turbidimetric determination of sulfate. 5.11.2 Reagents and materials
5.11.2.1 Hydrogen peroxide;
5.11.2.2 Hydrochloric acid solution: 1+4
5.11.2.3 Sodium chloride solution: 250g/L; 5.11.2.4 Sulfate standard solution: 1mL solution contains 0.01mgSO4. Prepare before use. Use a pipette to transfer 10mL of sulfate standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute to the mark with water, and shake well.
W.bzsoso.coI5.11.3 Analysis steps
5.11.3.1 Preparation of test solution
HG/T2835—1997
Weigh about 1g of sample (accurate to 0.01g), place in a 50mL beaker, add a small amount of water to moisten, add 10mL of hydrochloric acid solution to completely dissolve the sample, add hydrogen peroxide to fade the color, and evaporate to dryness on a water bath. Dissolve the residue with water, transfer the solution to a 100mL volumetric flask, dilute to the scale, and shake well.
5.11.3.2 Determination
Use a pipette to transfer 20mL of the test solution, place in a 50mL colorimetric tube, add water to about 10mL, add 1mL of hydrochloric acid solution, 1mL of barium chloride solution, dilute to the scale with water, and shake well. Let stand for 5min, and the turbidity should not be greater than that of the standard turbidity solution. Preparation of standard turbidity solution: Use a pipette to transfer 4mL (superior product) and 6mL (first-class product) of sulfate standard solution, and treat it in the same way as the test solution.
5.12 Determination of specific surface area
Determine according to GB/T13390.
5.13 Determination of sieve residue content
5.13.1 Instruments and equipment
5.13.1.1 Test sieve: R40/3 series in accordance with GB/T6003-85, Φ75mm×50mm/45μm5.13.1.2 Soft brush;
5.13.1.3 Electric oven: The temperature can be controlled at 105~110℃. 5.13.2 Analysis steps
Weigh about 10g of sample (accurate to 0.01g). Place the sample on a test sieve that has been pre-weighted, wet the sample with water, immerse the lower part of the test sieve in water, and gently scrub it with a soft brush. Replace the water as appropriate until the water is clear and there is no sample on the soft brush. Then rinse the test sieve and the soft brush twice with water. Place the test sieve in an electric oven and dry it at 105-110℃ until it reaches constant weight. 5.13.3 Expression of analysis results
Sieve residue X expressed as mass percentage. Calculate according to formula (8): =ml×100
Where: m1——mass of sieve residue, g; m——mass of sample, g.
5.14 Determination of bulk density
5.14.1 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 of the sample is determined. 5.14.2 Instruments and equipment
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 30 mm. The material is organic glass. 8
W.bzsoso.coI5.14.3 Analysis steps
HG/T2835-1997
1-hopper: 2-baffle; 3-bracket; 4-measuring cup (250mL) Figure 1 Bulk density tester
Within 1m, let the sample fall freely through the funnel into a measuring cylinder with 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). 5.14.4 Expression of analysis results
Bulk density X expressed as mass per unit volume. Calculate according to formula (9): Xg = ml = m2 × 100
Where: ml
-mass of the sample and the measuring cylinder, g;
-mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5.14.5 Allowable difference
The arithmetic mean of the results of parallel determinations shall be taken as the determination result. The absolute difference of the results of parallel determinations shall not exceed 0.02g/mL. 6 Marking, packaging, transportation, storage
(9)
6.1 The packaging bags of manganese tetraoxide for soft ferrites shall be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, and number of this standard. 6.2 Each batch of manganese tetraoxide for soft ferrites shall 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 complies with this standard and the number of this standard. 6.3 The packaging of manganese tetraoxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.40.8mm; the outer packaging is a plastic woven bag, and its performance and inspection method should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 25kg, 50kg or the packaging specifications can be determined according to user requirements. 6.4 The inner bag of manganese tetraoxide for soft ferrites is manually tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the opening is 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 is not less than 10mm, the stitches are neat and the stitch length is uniform. There is no leakage or skipping. 6.5 Manganese tetraoxide for soft ferrites should be covered during transportation to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.
HG/T2835—1997
Manganese tetraoxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.2. Start the operation from "(1) without adding standard solution". 5.10.5 Expression of analysis results
The lead (Pb) content X expressed as mass percentage is calculated according to formula (7): X, = × 100 × 10-6
m × 250
Where: c - the lead concentration found from the standard curve, ug/mL; - the mass of the sample mentioned in 5.6.4.1, 8. m
5.10.6 Allowable difference
(7)
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 superior and first-class products, and not exceed 0.005% for qualified products. 5.11 Determination of sulfate content
5.11.1 Method summary
In an acidic medium, sulfate ions and barium ions generate insoluble barium sulfate. When the sulfate ion content is low, barium sulfate will be suspended for a certain period of time, making the solution turbid. It can be used for visual turbidimetric determination of sulfate. 5.11.2 Reagents and materials
5.11.2.1 Hydrogen peroxide;
5.11.2.2 Hydrochloric acid solution: 1+4
5.11.2.3 Sodium chloride solution: 250g/L; 5.11.2.4 Sulfate standard solution: 1mL solution contains 0.01mgSO4. Prepare before use. Use a pipette to transfer 10mL of sulfate standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute to the mark with water, and shake well.
W.bzsoso.coI5.11.3 Analysis steps
5.11.3.1 Preparation of test solution
HG/T2835—1997
Weigh about 1g of sample (accurate to 0.01g), place in a 50mL beaker, add a small amount of water to moisten, add 10mL of hydrochloric acid solution to completely dissolve the sample, add hydrogen peroxide to fade the color, and evaporate to dryness on a water bath. Dissolve the residue with water, transfer the solution to a 100mL volumetric flask, dilute to the scale, and shake well.
5.11.3.2 Determination
Use a pipette to transfer 20mL of the test solution, place in a 50mL colorimetric tube, add water to about 10mL, add 1mL of hydrochloric acid solution, 1mL of barium chloride solution, dilute to the scale with water, and shake well. Let stand for 5min, and the turbidity should not be greater than that of the standard turbidity solution. Preparation of standard turbidity solution: Use a pipette to transfer 4mL (superior product) and 6mL (first-class product) of sulfate standard solution, and treat it in the same way as the test solution.
5.12 Determination of specific surface area
Determine according to GB/T13390.
5.13 Determination of sieve residue content
5.13.1 Instruments and equipment
5.13.1.1 Test sieve: R40/3 series in accordance with GB/T6003-85, Φ75mm×50mm/45μm5.13.1.2 Soft brush;
5.13.1.3 Electric oven: The temperature can be controlled at 105~110℃. 5.13.2 Analysis steps
Weigh about 10g of sample (accurate to 0.01g). Place the sample on a test sieve that has been pre-weighted, wet the sample with water, immerse the lower part of the test sieve in water, and gently scrub it with a soft brush. Replace the water as appropriate until the water is clear and there is no sample on the soft brush. Then rinse the test sieve and the soft brush twice with water. Place the test sieve in an electric oven and dry it at 105-110℃ until it reaches constant weight. 5.13.3 Expression of analysis results
Sieve residue X expressed as mass percentage. Calculate according to formula (8): =ml×100
Where: m1——mass of sieve residue, g; m——mass of sample, g.
5.14 Determination of bulk density
5.14.1 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 of the sample is determined. 5.14.2 Instruments and equipment
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 30 mm. The material is organic glass. 8
W.bzsoso.coI5.14.3 Analysis steps
HG/T2835-1997
1-hopper: 2-baffle; 3-bracket; 4-measuring cup (250mL) Figure 1 Bulk density tester
Within 1m, let the sample fall freely through the funnel into a measuring cylinder with 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). 5.14.4 Expression of analysis results
Bulk density X expressed as mass per unit volume. Calculate according to formula (9): Xg = ml = m2 × 100
Where: ml
-mass of the sample and the measuring cylinder, g;
-mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5.14.5 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 0.02g/mL. 6 Marking, packaging, transportation and storage
(9)
6.1 The packaging bag of manganese tetraoxide for soft ferrites shall be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, and this standard number. 6.2 Each batch of manganese tetraoxide for soft ferrites shall 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 complies with this standard and the number of this standard. 6.3 The packaging of manganese tetraoxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.40.8mm; the outer packaging is a plastic woven bag, and its performance and inspection method should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 25kg, 50kg or the packaging specifications can be determined according to user requirements. 6.4 The inner bag of manganese tetraoxide for soft ferrites is manually tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the opening is 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 is not less than 10mm, the stitches are neat and the stitch length is uniform. There is no leakage or skipping. 6.5 Manganese tetraoxide for soft ferrites should be covered during transportation to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.
HG/T2835—1997
Manganese tetraoxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.01g), place it in a 50mL beaker, add a small amount of water to moisten it, add 10mL hydrochloric acid solution to completely dissolve the sample, add hydrogen peroxide to fade the color, and evaporate it on a water bath to dryness. Dissolve the residue with water, transfer the solution to a 100mL volumetric flask, dilute to the scale, and shake well.
5.11.3.2 Determination
Use a pipette to transfer 20mL of the test solution, place it in a 50mL colorimetric tube, add water to about 10mL, add 1mL hydrochloric acid solution, 1mL barium chloride solution, dilute to the scale with water, and shake well. Place it for 5min, and the turbidity should not be greater than that of the standard turbidity solution. Preparation of standard turbidity solution: Use a pipette to transfer 4mL (superior product) and 6mL (first-class product) of sulfate standard solution, and treat it in the same way as the test solution.
5.12 Determination of specific surface area
Determine according to GB/T13390.
5.13 Determination of sieve residue content
5.13.1 Instruments and equipment
5.13.1.1 Test sieve: R40/3 series in accordance with GB/T6003-85, Φ75mm×50mm/45μm5.13.1.2 Soft brush;
5.13.1.3 Electric oven: the temperature can be controlled at 105~110℃. 5.13.2 Analysis steps
Weigh about 10g of sample (accurate to 0.01g). Place it in a test sieve that has been weighed constant in advance, moisten the sample with water, immerse the lower part of the test sieve in water, and gently brush it with a soft brush. Replace the water as appropriate until the water is clear and there is no sample on the soft brush. Then rinse the test sieve and soft brush with water twice. Place the test sieve in an electric oven and dry it at 105~110℃ until constant weight. 5.13.3 Expression of analysis results
Sieve residue X expressed as mass percentage. Calculate according to formula (8): = ml × 100
Where: m1——mass of sieve residue, g; m——mass of sample, g.
5.14 Determination of bulk density
5.14.1 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 of the sample is determined. 5.14.2 Instruments and equipment
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 distance of 30 mm. The material is organic glass. 8
W.bzsoso.coI5.14.3 Analysis steps
HG/T2835—1997
1—hopper: 2—baffle; 3—support; 4—measuring cup (250mL)Figure 1 Bulk density tester
Within 1m, let the sample fall freely through the funnel into a measuring cylinder with known mass and volume. The top of the cone 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). 5.14.4 Expression of analysis results
Bulk density X expressed as mass per unit volume. Calculate according to formula (9): Xg = ml = m2 × 100
Where: ml
-mass of the sample and the measuring cylinder, g;
-mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5.14.5 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 0.02g/mL. 6 Marking, packaging, transportation and storage
(9)
6.1 The packaging bag of manganese tetraoxide for soft ferrites shall be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, and this standard number. 6.2 Each batch of manganese tetraoxide for soft ferrites shall 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 complies with this standard and the number of this standard. 6.3 The packaging of manganese tetraoxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.40.8mm; the outer packaging is a plastic woven bag, and its performance and inspection method should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 25kg, 50kg or the packaging specifications can be determined according to user requirements. 6.4 The inner bag of manganese tetraoxide for soft ferrites is manually tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the opening is 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 is not less than 10mm, the stitches are neat and the stitch length is uniform. There is no leakage or skipping. 6.5 Manganese tetraoxide for soft ferrites should be covered during transportation to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.
HG/T2835—1997
Manganese tetraoxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.01g), place it in a 50mL beaker, add a small amount of water to moisten it, add 10mL hydrochloric acid solution to completely dissolve the sample, add hydrogen peroxide to fade the color, and evaporate it on a water bath to dryness. Dissolve the residue with water, transfer the solution to a 100mL volumetric flask, dilute to the scale, and shake well.
5.11.3.2 Determination
Use a pipette to transfer 20mL of the test solution, place it in a 50mL colorimetric tube, add water to about 10mL, add 1mL hydrochloric acid solution, 1mL barium chloride solution, dilute to the scale with water, and shake well. Place it for 5min, and the turbidity should not be greater than that of the standard turbidity solution. Preparation of standard turbidity solution: Use a pipette to transfer 4mL (superior product) and 6mL (first-class product) of sulfate standard solution, and treat it in the same way as the test solution.
5.12 Determination of specific surface area
Determine according to GB/T13390.
5.13 Determination of sieve residue content
5.13.1 Instruments and equipment
5.13.1.1 Test sieve: R40/3 series in accordance with GB/T6003-85, Φ75mm×50mm/45μm5.13.1.2 Soft brush;
5.13.1.3 Electric oven: the temperature can be controlled at 105~110℃. 5.13.2 Analysis steps
Weigh about 10g of sample (accurate to 0.01g). Place it in a test sieve that has been weighed constant in advance, moisten the sample with water, immerse the lower part of the test sieve in water, and gently brush it with a soft brush. Replace the water as appropriate until the water is clear and there is no sample on the soft brush. Then rinse the test sieve and soft brush with water twice. Place the test sieve in an electric oven and dry it at 105~110℃ until constant weight. 5.13.3 Expression of analysis results
Sieve residue X expressed as mass percentage. Calculate according to formula (8): = ml × 100
Where: m1——mass of sieve residue, g; m——mass of sample, g.
5.14 Determination of bulk density
5.14.1 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 of the sample is determined. 5.14.2 Instruments and equipment
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 distance of 30 mm. The material is organic glass. 8
W.bzsoso.coI5.14.3 Analysis steps
HG/T2835—1997
1—hopper: 2—baffle; 3—support; 4—measuring cup (250mL) Figure 1 Bulk density tester
Within 1m, let the sample fall freely through the funnel into a measuring cylinder with known mass and volume. The top of the cone 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). 5.14.4 Expression of analysis results
Bulk density X expressed as mass per unit volume. Calculate according to formula (9): Xg = ml = m2 × 100
Where: ml
-mass of the sample and the measuring cylinder, g;
-mass of the measuring cylinder, g;
V——volume of the measuring cylinder, mL.
5.14.5 Allowable difference
The arithmetic mean of the results of parallel determinations shall be taken as the determination result. The absolute difference of the results of parallel determinations shall not exceed 0.02g/mL. 6 Marking, packaging, transportation, storage
(9)
6.1 The packaging bags of manganese tetraoxide for soft ferrites shall be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, grade, net weight, batch number or production date, and number of this standard. 6.2 Each batch of manganese tetraoxide for soft ferrites shall 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 complies with this standard and the number of this standard. 6.3 The packaging of manganese tetraoxide for soft ferrites is double-layer packaging: the inner packaging is a polyethylene plastic film bag with a thickness of 0.40.8mm; the outer packaging is a plastic woven bag, and its performance and inspection method should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 25kg, 50kg or the packaging specifications can be determined according to user requirements. 6.4 The inner bag of manganese tetraoxide for soft ferrites is manually tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the opening is 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 is not less than 10mm, the stitches are neat and the stitch length is uniform. There is no leakage or skipping. 6.5 Manganese tetraoxide for soft ferrites should be covered during transportation to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.
HG/T2835—1997
Manganese tetraoxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.3. The packaging of manganese tetraoxide for soft ferrite is double-layer packaging: the inner packaging is polyethylene plastic film bag, thickness: 0.40.8mm; the outer packaging is plastic woven bag, and its performance and inspection method should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 25kg, 50kg or the packaging specifications can be determined according to the user's requirements. 6.4. The inner bag of manganese tetraoxide for soft ferrite is tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is 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 is not less than 10mm, the stitches are neat and the stitch length is uniform. There is no leakage and skipping. 6.5 Manganese tetraoxide for soft ferrites should be covered during transportation to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.
HG/T2835—1997
Manganese tetraoxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.3. The packaging of manganese tetraoxide for soft ferrite is double-layer packaging: the inner packaging is polyethylene plastic film bag, thickness: 0.40.8mm; the outer packaging is plastic woven bag, and its performance and inspection method should comply with the provisions of GB/T8946-88B. The net weight of each bag of this product is 25kg, 50kg or the packaging specifications can be determined according to the user's requirements. 6.4. The inner bag of manganese tetraoxide for soft ferrite is tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the bag edge, and the edge is 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 is not less than 10mm, the stitches are neat and the stitch length is uniform. There is no leakage and skipping. 6.5 Manganese tetraoxide for soft ferrites should be covered during transportation to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.
HG/T2835—1997
Manganese tetraoxide for soft ferrites should be stored in a cool and dry place to prevent rain and moisture, and should not be mixed with acids, oxidants, etc.
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