Some standard content:
HG/T2773—1996
In this standard, the superior and first-class products are not equivalent to the Russian Federation Standard TOCT21907:1976 (revised in 1989 and implemented from January 1, 1990).
This standard divides the products into three grades according to the actual situation in my country. The main technical differences with the Russian Federation standard are as follows: 1 The index of the total content of zirconium dioxide and hafnium dioxide, iron oxide content, silicon dioxide content and aluminum oxide content are better than the Russian Federation standard level.
According to the actual situation, the index of the sieve residue is not specified, but it is noted that it can be produced according to user requirements. 2
3 The total content of zirconium dioxide and hafnium dioxide, iron oxide content, silicon dioxide content, aluminum oxide content and titanium dioxide content are determined by the national standard methods of GB/T2590 series in my country. The calcium oxide content and magnesium oxide content are determined by atomic absorption spectrophotometry. 4
Appendix A of this standard is the appendix of the standard. 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, Jiaozuo Chemical General Plant of Henan Province, and Yixing Chemical Plant of Jiangsu Xinxing Chemical Group Corporation.
The main drafters of this standard are: Wang Qi, Sun Yaguang, Zang Jincheng, Yang Xinmin, and Yang Fupei. 254
Chemical Industry Standard of the People's Republic of China
Industrial Zirconium Dioxide
HG/T 2773—1996
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation, and storage of industrial zirconium dioxide. This standard applies to industrial zirconium dioxide. This product is mainly used in ceramics, refractory materials, optical glass, ceramic glazes and other industries. Molecular formula: 2rOz
Relative molecular mass: 123.22 (according to the international relative atomic mass in 1991). Cited 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 191---1990
Packaging, storage and transportation pictorial marking
Preparation of standard solutions for titration analysis (volume analysis) Chemical reagents
GB/T 601—1988
GB/T 602—1988
GB/T 603—1988
Chemical reagents
Preparation of standard solutions for determination of impurities (neqISO6353-1:1982) Preparation of preparations and products used in test methods (neqISO6353-1:1982) Chemical reagents
GB/T 1250—1989
Expression and determination methods of limit values GB/T2590.1-1981
GB/T 2590. 2-
GB/T 2590. 3---1981
GB/T 2590. 4—1981
GB/T 2590. 6---1981
GB/T 6003-—1985
GB/T 6678—1986
GB/T 6682--1992
GB/T 8946-1988
3 Requirements
Determination of the total amount of zirconium oxide and hafnium oxide in zirconium oxide and hafnium oxide (mandelic acid gravimetric method) Determination of the amount of iron in zirconium oxide and hafnium oxide (sulfosalicylic acid absorptiometry) Determination of the amount of silicon in zirconium oxide and hafnium oxide (silicon molybdenum blue absorptiometry) Determination of the amount of aluminum in zirconium oxide and hafnium oxide (chrome azurol S-tetradecylpyridine chloride absorptiometry) Determination of the amount of titanium in zirconium oxide and hafnium oxide (diantipyridine methane absorptiometry) Test sieve
General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987) Plastic woven bags
3.1 Appearance: white amorphous particles.
3.2 Industrial zirconium dioxide shall meet the requirements of Table 1: Item
Total amount of zirconium dioxide (ZrO) and hafnium dioxide (HfO2) Iron oxide (FezO) content
Silicon dioxide (SiO2) content
Approved by the Ministry of Chemical Industry of the People's Republic of China on January 24, 1996 Requirements of Table 1
Superior product
First-class product
Qualified product
Implemented on January 1, 1997
Total amount of sodium oxide (Naz) and potassium oxide (KO) Ignition loss
Aluminum oxide (Al,O,) content
Titanium dioxide (TiO,) content
Calcium oxide (Ca()) content
Magnesium oxide (Mg (O) content
Phosphorus pentoxide (P2) content
Sulfur (measured in SO:) content
HG/T2773—1996
Table 1 (end)
Superior products
·Qualified products
3.3 Residue on sieves: The content of residue on sieves shall meet the requirements of users, and the test method shall be carried out in accordance with the provisions of Appendix A (Appendix to the standard). 4 Sampling
4.1 Each batch of products shall not exceed 1t.
Qualified products
4.2 Determine the number of sampling units in accordance with the provisions of GB/T66786.6. 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, reduce them to no less than 500g by the quartering method, and divide them into Place in two clean and dry wide-mouth bottles with stoppers and seal. 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 is kept for three months for future reference. 4.3 If any indicator in the test results does not meet the requirements of this standard, re-sample from twice the amount of packaging should be conducted for verification. Even if one of the indicators in the verification results does not meet the requirements of this standard, the entire batch of products will be unqualified. 5 Test method
5.1 All eleven indicator items specified in this standard are type test items, of which the total amount of zirconium dioxide and hafnium dioxide, iron oxide content, silicon dioxide content, total amount of sodium oxide and potassium oxide, and loss on ignition are routine test items and should be tested batch by batch. Under normal production conditions 5.2 The rounding values specified in GB/T12505.2 shall be used to compare and determine whether the test results meet the standards. 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 solutions, impurity standard solutions, preparations and products used in the test, unless otherwise specified, shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603.
Determination of the total amount of zirconium dioxide and hafnium dioxide 5.4
Perform in accordance with GB/T2590.1.
5.5 Determination of iron oxide content
Perform in accordance with GB/T2590.2.
The iron oxide (Fe2O) content X expressed as a mass percentage is calculated according to formula (1): X = 1. 430 × Y
Wherein: Y1----the percentage of iron measured according to GB/T2590.2; 1.430 is the coefficient for converting iron into iron oxide.
5.6 Determination of silicon dioxide content
It shall be carried out in accordance with the provisions of GB/T2590.3.
The silicon dioxide (SiO2) content X expressed as a mass percentage is calculated according to formula (2): 256
HG/T 2773—1996
X: - 2. 139 XY2
Wherein: Y2—-.-the percentage of silicon measured according to GB/T2590.3; 2.139.-the coefficient for converting silicon into silicon dioxide. 5.7 Determination of the total amount of sodium oxide and potassium oxide
5.7.1 Summary of the method
Dissolve the sample in sulfuric acid and ammonium sulfate, and use the standard addition method on a flame photometer or an atomic absorption spectrophotometer with flame emission to determine the sodium oxide and potassium oxide content based on the spectral intensity excited by the flame combustion of sodium and potassium respectively. 5.7.2 Reagents and materials
5.7.2.1 Sulfuric acid;
5.7.2.2 Ammonium sulfate;
5.7.2.3 Sodium and potassium standard solutions: 1ml. The solution contains 0.01mgNa and 0.01mgK. Take 10.0ml. of the sodium standard solution and potassium standard solution prepared according to GB/T602, respectively, place them in a 100mL volumetric flask, dilute to the scale with water, and shake well. The solution should be prepared just before use. The solution should be stored in a polyethylene plastic bottle. 5.7.3 Apparatus and equipment
Flame photometer or atomic absorption spectrophotometer with flame emission. 5.7.4 Analysis steps
Weigh about 1g of sample (accurate to 0.01g) and place it in a 100mL beaker. Add 10mL sulfuric acid and 5g ammonium sulfate, cover the surface III, and heat until the sample is completely dissolved. Cool, blow water to wash the surface blood and the wall of the cup and dilute to about 50mL, transfer to a 100ml volumetric flask, add water to the scale, and shake the hook. Take 3 portions of 20.0mL of test solution, place them in 3 100mL volumetric flasks, then add 0, 2.00, and 4.00mL sodium and potassium standard solutions respectively, dilute to the scale with water, and shake the hook. Measure the radiation intensity on a flame photometer or an atomic absorption spectrophotometer with flame emission (sodium at a wavelength of 589.0nm and potassium at a wavelength of 766.5nm). Use the graphic epitaxy method to calculate the amount of sodium and potassium in the test solution respectively.
5.7.5 Expression of analysis results
Content X of sodium oxide (NazO) and potassium oxide (KO) expressed as mass percentage: calculated according to formula (3): Xx 1.348Xm+ 1.205Xm2 ×100m×10×%
0.674 0Xm.+0.602 5×m2
Wherein: ml--the amount of sodium in the test solution obtained by the graphic epitaxy method, mg; m2--the amount of potassium in the test solution obtained by the graphic epitaxy method, mg; 1.348--the coefficient for converting sodium into sodium oxide; 1.205--the coefficient for converting potassium into potassium oxide; m--the mass of the sample, g.
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 0.002%. 5.8 Determination of loss on ignition
(3)
5.8.1 Analysis procedure
Weigh about 2 g of sample (accurate to 0.0002 g), place in porcelain that has been ignited to constant weight at 1000℃～1100℃, and ignite at 1000℃～1100℃ to constant weight. 5.8.2 Expression of analysis results
The loss on ignition X expressed as a mass percentage is calculated according to formula (4): 257
HG/T 2773—1996
Where: m,--mass of porcelain crucible and sample before ignition, g; m
-mass of porcelain crucible and sample after ignition, g; m. mass of sample, g.
5.8.3 Allowable difference
= 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 0.1%. 5.9 Determination of aluminum oxide content
Perform according to GB/T2590.4.
Aluminum oxide (Al.O:) content X expressed as mass percentage. Calculate according to formula (5): X; = 1. 890 X Ys
Where: Y. ---Aluminum content measured according to GB/T2590.4; 1.890-
Coefficient for converting aluminum to aluminum oxide.
5.10 Determination of titanium dioxide content
Perform according to GB/T2590.6.
Titanium dioxide (TiO2) content X expressed as mass percentage. Calculate according to formula (6): X = 1.668 X Y.
Wherein, Y
is the percentage of titanium measured according to GB/T2590.6; the coefficient for converting titanium into titanium dioxide.
5.11 Determination of calcium oxide content
(4)
(5)
5.11.1 Summary of method
Dissolve the sample in sulfuric acid and ammonium sulfate, and determine it on an atomic absorption spectrophotometer using a wavelength of 422.7nm and an air-acetylene flame using the standard addition method.
5.11.2 Reagents and materials
5.11.2.1 Sulfuric acid;
5.11.2.2 Ammonium sulfate;
5.11.2.3 Calcium standard solution: 1mL of solution contains 0.1mgCa. 5.11.3 Instruments and equipment
Atomic absorption spectrophotometer: equipped with a calcium hollow cathode lamp. 5.11.4 Analysis steps
Weigh about 1g of sample (accurate to 0.01g) and place it in a 100mL beaker. Add 10mL sulfuric acid and 5g ammonium sulfate, cover the surface IIIL, and heat until the sample is completely dissolved. Cool, blow water to wash the surface III and the wall of the cup and dilute to about 50ml, transfer to a 100mL volumetric flask, add water to the scale, and shake well. Take 3 portions of 20.0ml of the test solution, place them in 3 100mL volumetric flasks, then add 0, 0.20, and 0.50ml of the calcium standard solution respectively, dilute to the scale with water, and shake well. On the atomic absorption spectrophotometer, use a wavelength of 422.7nm and an air-acetylene flame to measure its absorbance. Use the graphic epitaxy method to determine the amount of calcium in the test solution. 5.11.5 Expression of analysis results
Calcium oxide (CaO) content X expressed as mass percentage is calculated according to formula (7): X = -m X1. 399
m×1000×1%
0.700×ml
--calcium content in the test solution obtained by graphical extrapolation method, mg;; Where: mi
--mass of the sample, g;
. (7)
Coefficient for converting calcium to calcium oxide.
5.11.6 Allowable difference
HG/T 2773-1996
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 0.003%. 5.12 Determination of magnesium oxide content
5.12.1 Method summary
Dissolve the sample with sulfuric acid and ammonium sulfate, and determine it on an atomic absorption spectrophotometer using a wavelength of 285.2nm and an air-acetylene flame using the standard addition method.
5.12.2 Reagents and materials
5.12.2.1 Sulfuric acid;
5.12.2.2 Ammonium sulfate;
5.12.2.3 Magnesium standard solution: 1mL solution contains 0.1mgMg5.12.3 Instruments and equipment
Atomic absorption spectrophotometer: equipped with a magnesium hollow cathode lamp. 5.12.4 Analysis steps
Weigh about 0.5g of the sample (accurate to 0.01g) and place it in a 100mL beaker. Add 5mL of sulfuric acid and 3g of ammonium sulfate, cover the surface with blood, and heat until the sample is completely dissolved. Cool, rinse surface III and the cup wall with water and dilute to about 50ml, transfer to a 100mL volumetric flask, add water to the mark, and shake well. Take 3 portions of 20.0mL of the test solution, place them in 3 100mL volumetric flasks, then add 0, 0.10, and 0.30ml of magnesium standard solution respectively, dilute to the mark with water, and shake well. On an atomic absorption spectrophotometer, use a wavelength of 285.2nm and an air acetylene flame to measure its absorbance. Use the graphic epitaxy method to determine the amount of magnesium in the test solution. 5.12.5 Expression of analysis results
Magnesium oxide (MgO)X expressed as mass percentage. Calculate according to formula (8): Xg = mi X1.658
-×100
m×1000×1%
_ 0.829 Xml
Wherein: mi-
is the amount of magnesium in the test solution obtained by the graphic extension method, mg; the mass of the sample, g;
1.658 is the coefficient for converting magnesium into magnesium oxide. 5.12.6 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 0.003%. 5.13 Determination of phosphorus pentoxide content
·(8)
5.13.1 Summary of method
In an acidic medium, phosphate reacts with molybdate to form phosphomolybdic acid, which is reduced to phosphomolybdic blue by ascorbic acid. Its absorbance is measured at 760 nm using a spectrophotometer.
5.13.2 Reagents and Materials
5.13.2.1 Potassium pyrosulfate;
5.13.2.2 Sulfuric acid solution: 1+39;
5.13.2.3 Ascorbic acid solution: 10g/I, stored in a brown bottle, shelf life is 14d; 5.13.2.4 Zirconium sulfate standard solution: 1mL solution contains 0.01g ZrOz; Weigh 13.10g zirconium oxychloride octahydrate (zirconium oxychloride), place in a 300mL beaker, moisten with water, add 25mL sulfuric acid, carefully heat to boiling and keep sulfur trioxide gas escaping for 3min. After cooling, carefully rinse the wall of the cup with 5mL~10mL water, and reheat until sulfur trioxide gas escapes. Cool, add 200mL water to dissolve, filter and wash, collect all the filtrate and washing liquid in a 500mL volumetric flask, dilute with water to the scale, and shake the hook.
HG/T 2773—1996www.bzxz.net
5.13.2.5 Phosphorus standard solution: 1 mL of solution contains 0.01 mg P; take 10.0ml phosphorus standard solution prepared according to GB/T602, placed in a 100ml volumetric flask, diluted with water to the mark, and shaken. Prepare this solution before use.
5.13.2.6 Ammonium molybdate sulfuric acid solution: 50g/1. Weigh 5.00g of ammonium molybdate dried to constant weight at 105℃~~110℃. Dissolve in 50mL~60mL water under heating. Cool, filter into a 100ml volumetric flask, and wash. Add 10mL 1+1 sulfuric acid solution, dilute with water to the mark, and shaken. Use this solution within 30 days.
5.13.3 Instruments and equipment
Spectrophotometer: with 1cm absorption cell.
5.13.4 Analysis steps
5.13.4.1 Drawing of working curve
In 6 50mL volumetric flasks, add 4mL zirconium sulfate standard solution, add 1.0ml, 2.0ml, 4.0ml, 6.0ml, 8.0ml, 10.0ml phosphorus standard solution, add sulfuric acid solution to about 30mL, add 5ml ammonium molybdate solution, wash the bottleneck with 1ml ascorbic acid solution under continuous mixing, and dilute to the scale with sulfuric acid solution. Place the volumetric flask in a boiling water bath for 15min. At the same time, perform a blank test with the same amount of reagents and the same operation, except that zirconium sulfate standard solution and phosphorus standard solution are not added. Use a 1cm absorption cell and blank solution as reference to measure its absorbance at 760nm. Draw a working curve with phosphorus content as the horizontal axis and the corresponding absorbance as the vertical axis.
5.13.4.2 Determination
Weigh about 0.05g of sample (accurate to 0.0002g), place it in a porcelain crucible, add 3g of potassium pyrosulfate, melt it at 500℃~600℃, rotate the crucible to mix the melt, and then burn it at 750℃~800℃ for 10min~12min to obtain a transparent melt. Cool it, add sulfuric acid solution to it and heat it to dissolve it, and transfer it to a 50mL volumetric flask with a funnel. Cool it, add 5ml of ammonium molybdate solution, rinse the bottle wall with sulfuric acid solution, add 1ml of ascorbic acid solution, mix it, dilute it to the scale with sulfuric acid solution, and shake it well. Place it in a boiling water bath for 15 min.
Carry out a blank test at the same time.
Use a 1cm absorption cell and measure its absorbance at 760nm with the blank test solution as a reference. 5.13.5 Expression of analysis results
Content X of phosphorus pentoxide (P2O) expressed as mass percentage is calculated according to formula (9): X = mlX2.292
m×100%×100
Wherein: m---mass of phosphorus obtained from the working curve, mg, mass of the sample, g;
2.292---coefficient for converting phosphorus to phosphorus pentoxide. (9)
5.13.6 Allowable difference
The arithmetic mean of the results of parallel determinations is taken as the determination result. The absolute difference of the results of parallel determinations is not more than 0.02% for superior products and not more than 0.03% for first-class products.
5.14 Determination of sulfur content
5.14.1 Summary of the method
Sulfur reacts with oxygen at high temperature to form sulfur dioxide. The sulfur dioxide gas is absorbed by iodine. The sulfur content is calculated by the amount of iodine standard titration solution consumed.
5.14.2 Reagents and materials
5.14.2.1 Oxygen;
5. 14. 2. 2
Silicon dioxide;
5.14.2.3 Iodine standard titration solution: c(1/2I2) about 0.005 mol/L; 260
HG/T 2773—1996
a) Preparation: Weigh 0.65 g iodine and 1.75 g potassium iodide, dissolve in 100 ml water, dilute to 1000 ml, shake well, and store in a brown stoppered bottle.
b) Calibration: Weigh 0.15g of standard arsenic trioxide (accurate to 0.0001g) that has been dried to constant weight in a sulfuric acid dryer in advance, and place it in a 100ml beaker. Add 4ml of sodium hydroxide solution [c(Na0H)=1mol/L to dissolve, add 50ml of water, add 2 drops of phenolphthalein indicator solution (10g/1), neutralize with sulfuric acid solution [r(1/2H,SO)=1mol/IJ, transfer to a 500ml volumetric flask, dilute with water to the scale, and shake. Take 25.0ml and place it in an iodine volumetric flask, add 3g of sodium bicarbonate and 3ml of starch indicator solution (5g/I.). Titrate with the prepared iodine standard titration solution until the solution turns light blue. Perform a blank test at the same time. c) The concentration of the iodine standard titration solution is calculated according to formula (10): 25
(Vi-V2)X0.049 46
_1.011 Xm
Wherein: m-…mass of arsenic trioxide, g; Vh
the amount of iodine standard titration solution used, mL;
V---the amount of iodine standard titration solution used in the blank test, mL.; 0.04946--
(10)
the mass of arsenic trioxide in grams equivalent to 1.00mL of iodine standard titration solution Lc (1/212) = 1.000mol/L).
5.14.2.4 Starch absorption solution.
Weigh 0.5g of soluble starch (accurate to 0.01g) and place it in a porcelain mortar. Add 50mL of water and grind carefully, pour into 950mL of boiling water, add 2 drops of hydrochloric acid, boil for 2min~3min, cool, and filter. 5.14.3 Instruments and equipment
1-Oxygen cylinder: with pressure reducing valve; 2-Gas washing bottle: filled with potassium permanganate alkaline solution (dissolve 400g of potassium hydroxide in water, add 40g of potassium permanganate, after dissolving, add water to dilute to 1L), 3-Gas washing bottle: filled with concentrated sulfuric acid; 4--U-shaped tube: the left half is filled with soda lime, and the right half is filled with granular calcium chloride; 5--Ceramic tube: inner diameter 18~~20mtm, length should exceed the furnace length 160~170mm; 6. Horizontal Tubular electric furnace: can be heated to 1300℃; 7—temperature control device; 8—platinum-platinum thermocouple; 9. Porcelain boat; 10—glass ball or U-shaped tube: filled with glass wool; 11-microburette: graduation value is 0.02ml.; 12—glass absorption tube; 13-bubbler equipped with anti-back-absorption device; 14—glass absorption tube Figure 1 Sulfur content determination device diagram
5.14.4 Analysis steps
5.14.4.1 Instrument installation
HG/T 2773—1996
Connect the determination device according to Figure 1. Plug the two ends of the ceramic tube with rubber plugs lined with insulation pads and inserted with glass tubes or brass tubes, and check the air tightness of the device. When the temperature in the furnace rises to 1250℃, add 2/3 volume of starch absorption liquid to glass absorbers 12 and 14 respectively, and add iodine standard titration solution to make it light blue. One is used as absorption liquid and the other is used as reference solution. Oxygen is introduced at a rate of 3 to 5 bubbles per second. The color of the absorption liquid in the absorber should remain unchanged within 3 minutes. 5.14.4.2 Determination
Weigh 0.5g of sample (accurate to 0.0002g), place it in a porcelain boat that has been calcined at 1250℃~1300℃ under oxygen conditions, add 0.5g of silicon dioxide, mix well and spread into a thin layer. Place the porcelain boat in the direction of oxygen flow into the highest temperature part of the ceramic tube and immediately plug it.
According to the color change of the absorption liquid, use a microburette to add iodine standard titration solution to the absorption tube until the color of the absorption liquid is consistent with that of the reference solution and remains unchanged for 3 minutes. 5.14.5 Expression of analysis results
Sulfur content (in terms of SO3) expressed as mass percentage X1. Calculate according to formula (11): Xi = Yc×0.04003×100
Wherein: V—volume of titration consumption and iodine standard titration solution, mL; c—actual concentration of iodine standard titration solution, mol/L; (11)
m——mass of sample, g;
0.04003——mass of sulfur trioxide expressed in grams equivalent to 1.00mL iodine standard titration solution [c (1/212) = 1.000mol/L].
5.14.6 Allowable difference
Take the arithmetic mean of the parallel determination results as the determination result. The absolute difference of the parallel determination results: for superior products, not more than 0.02%; for standard products, not more than 0.03%.
6 Marking, packaging, transportation, storage
6.1 The packaging of industrial zirconium dioxide should have firm and clear markings, including: manufacturer name, address, product name, trademark, grade, net weight, batch number or production date, this standard number and the "wet-afraid" mark specified in GB191. 6.2 Each batch of industrial zirconium dioxide shipped out of the factory should be accompanied by a quality certificate. The contents include: manufacturer name, address, product name, trademark, grade, net weight, batch number or production date, proof that the product quality complies with this standard and this standard number. 6.3 Industrial zirconium dioxide is packaged in two ways. 6.3.1 Kraft paper barrel packaging. The inner packaging is made of two layers of polyethylene plastic film bags and one layer of plastic woven bags. The thickness of the film bags shall not be less than 0.05mm. The performance and inspection methods of the plastic woven bags shall comply with the provisions of Type A of GB/T8946. The outer packaging is made of kraft paper barrels, and its performance and inspection methods shall comply with relevant regulations. The net weight of each barrel is 25kg or 50kg. 6.3.2 Iron barrel packaging. The inner packaging is made of two layers of polyethylene plastic film bags, and the thickness shall not be less than 0.05mm. The outer packaging is made of iron barrels, and the thickness of the iron sheet shall not be less than 0.5mm. Its performance and inspection methods shall comply with relevant regulations. The net weight of each barrel is 25kg or 40kg. 6.4 Industrial zirconium dioxide is sealed in two ways. 6.4.1 When using kraft paper barrel packaging, the inner bag is tied with two layers of vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the kraft paper barrel is covered and clamped. 6.4.2 When using iron drums for packaging, the inner bag shall be tied with two layers of vinyl rope or other ropes of equivalent quality, or sealed with other equivalent methods; the iron drum shall be sealed with a pressure cover and welded firmly. 6.5 Industrial zirconium dioxide shall be covered during transportation to prevent rain and moisture. 6.6 Industrial zirconium dioxide shall be stored in a cool and dry place to prevent rain and moisture. 262
A1 Instruments and Equipment
HG/T2773—1996
Appendix A
(Standard Appendix)
Determination of sieve residue
A1.1 Test sieve: Φ200mm×50mm, the sieve mesh diameter shall be determined according to user requirements and shall comply with the R40/3 series of GB6003, and shall be equipped with a sieve bottom and sieve cover;
A1.2 Vibrating sieve machine.
A2 Analysis steps
Weigh 100g of sample (accurate to 0.1g) and place it in a test sieve with a sieve bottom installed, cover the sieve cover, and sieve on a vibrating sieve machine; or place the sample on a sieve and wet sieve under running water, and dry the sieve and the sieve residue at 105℃~110℃ to constant weight. Weigh the mass of the sieve residue (accurate to 0.0001g).
Explanation of analysis results
The content of the sieve residue X expressed as a mass percentage. Calculate according to formula (a): X. =㎡l×100
Where: mi-
The mass of the sieve residue, g;
mThe mass of the sample, g.
A4 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 0.1%. .(a)
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