Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2769—1996
Magnesium Oxide for Soft Ferrites
Published on January 24, 1996
Ministry of Chemical Industry of the People's Republic of China
Implemented on January 1, 1997
WHG/T2769—1996
This standard is formulated based on the technical requirements of well-known foreign companies and with reference to domestic enterprise standards. Compared with domestic enterprise standards, this standard adds aluminum oxide, average particle size and other items. Aluminum oxide adopts the limited colorimetric method, and the average particle size is determined by negotiation between the supply and demand parties. 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. This standard was drafted by: Qingdao Sanhe Chemical Co., Ltd., Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Shanghai Jinxing Chemical Plant, Shanghai Dunhuang Chemical Plant
The main drafters of this standard are: Lu Siwei, Yu Qingwen, Li Guangming, Zhu Minghua, Shen Jinxi. 1
W.bzsoso.con1Scope
Chemical Industry Standard of the People's Republic of China
Magnesium Oxide for Soft Ferrites
HG/T2769—1996
This standard specifies the requirements, sampling, test methods, marking, packaging, transportation and storage of magnesium oxide for soft ferrites. This standard applies to magnesium oxide for soft ferrites produced by brine method or magnesium-containing ore method. This product is mainly used in the manufacture of deflection cores and other magnesium-zinc ferrite cores in the electronics industry. Molecular formula: MgO
Relative molecular mass: 40.30 (according to the 1991 international relative atomic mass) 2 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. GB191-90 Pictorial symbols for packaging, storage and transportation
GB/T601-88 Preparation of standard solutions for titration analysis (volume analysis) of chemical reagents GB/T602-88 Preparation of standard solutions for determination of impurities of chemical reagents (neqISO6353/1:1982) GB/T603-88 Preparation of reagents and products used in chemical reagent test methods (neqISO6353/1:1982) GB/T1250-89 Methods for expressing and determining limit values GB/T3049-8 6 General method for determination of iron content in chemical products O-phenanthroline spectrophotometry (neqISO6685: 1982)
GB/T3051-82 General method for determination of chloride content in inorganic chemical products Mercury titration (neqISO5790: 1979) GB/T6678-86 General rules for sampling of chemical products GB/T6682-92
2 Specifications and test methods for water used in analytical laboratories (eqvISO3696: 1987) 8 Plastic woven bags
GB/T 8946-88
HG/T2573-94 Industrial magnesium oxide
3 Requirements
3.1 Appearance, white light powder.
3.2 Magnesium oxide for soft ferrites shall meet the requirements of Table 1. Table 1 Requirements
Magnesium oxide (MgO) content, %
Calcium oxide (CaO) content, %
Ministry of Chemical Industry of the People's Republic of China approved on January 24, 1996
Qualified products
Implementation on January 1, 1997
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Content of hydrochloric acid insoluble matter, %
Sulfate (as SO.) content, %
Aluminum oxide (as A1) content, %
Iron oxide ( Content (in Fe), %
Manganese (Mn) content, %
Ignition loss, %bZxz.net
Chloride (in C1), %
Bulk density, g/mL
Sieve residue (150μm test sieve), %
HG/T2769—1996
Table 1 (end)
First-class products
0.15~0.25
If the user has requirements for the average particle size of the product, the indicators and test methods determined by the supply and demand parties can be followed. 4 Sampling
4.1 Each batch of products shall not exceed 20t.
Qualified products
4.2 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678. 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, they are divided into about 500g according to the quartering method and divided into two clean and dry wide-mouth bottles with stoppers and sealed. Labels are attached to the bottles, indicating the 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, the sample should be re-sampled from the twice-sized packaging for verification. If even one of the test results does not meet the requirements of this standard, the entire batch of products is unqualified. 5 Test method
5.1 All eleven indicators specified in this standard are type test items, of which magnesium oxide, calcium oxide, hydrochloric acid insoluble matter, sulfate, ferric oxide, ignition loss and chloride 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 The rounded value comparison method specified in 5.2 of GB/T1250 is 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 analytically 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, are prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603.
5.4 Determination of magnesium oxide content
According to method 4.1 of HG/T2573.
5.5 Determination of calcium oxide content
According to method 4.2 of HG/T2573.
5.6 Determination of hydrochloric acid insoluble matter content
According to method 4.3 of HG/T2573.
5.7 Determination of sulfate content
According to method 4.4 of HG/T2573.
5.8 Determination of ferric oxide content
According to method 4.6 of HG/T2573.
5.9 Determination of manganese content
According to method 4.7 of HG/T2573.
5.10 Determination of chloride content
According to method 4.8 of HG/T2573.
5.11 Determination of loss on ignition
According to method 4.9 of HG/T2573.
5.12 Determination of bulk density
HG/T2769—1996
According to method 4.10 of HG/T2573. 5.13 Determination of aluminum oxide content
5.13.1 Method summary
In acidic medium, aluminum forms a blue complex with chrome azure S, and aluminum is determined by the limiting colorimetric method. 5.13.2 Reagents and materials
5.13.2.1 Hydrochloric acid solution: 1+1;
5.13.2.2 Hydrochloric acid solution: 1+15;
5.13.2.3 Ascorbic acid solution: 10g/L;5.13.2.4 Chrome azure S mixed solution;
5.13.2.5 Acetic acid-sodium acetate buffer solution (pH~6.5);5.13.2.6 Aluminum standard solution: 1mL solution contains 0.01mgAl. Use a pipette to transfer 10mL of the aluminum standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute it to the mark with water, and shake it well. This solution is prepared before use.
5.13.3 Analysis steps
5.13.3.1 Preparation of test solution
Weigh about 1g of the sample (accurate to 0.01g), place it in a 50mL beaker, add a small amount of water to moisten it, add hydrochloric acid solution (5.13.2.1) dropwise to completely dissolve the sample, and evaporate it on a water bath to dryness. After dissolving it with water, transfer the solution to a 100mL volumetric flask, dilute it to the mark, and shake it well.
5.13.3.2 Determination
Use a pipette to transfer 1.00mL (first-class product) and 0.4mL (qualified product) of the test solution into a 25mL colorimetric tube, add water to about 10mL, add 0.15mL of hydrochloric acid solution (5.13.2.2), 1mL of ascorbic acid solution, and 5mL of chrome azuro blue S mixed solution, and shake well. Add 2.5mL acetic acid-sodium acetate buffer solution, dilute to the scale, shake well. Let stand for 30 minutes, the blue color should not be deeper than the standard colorimetric solution. Preparation of standard colorimetric solution: Use a pipette to transfer 0.2mL aluminum standard solution and treat it in the same way as the test solution. 5.14 Determination of sieve residue content
According to the method in 4.5 of HG/T2573.
6 Marking, packaging, transportation and storage
6.1 The packaging bag of magnesium oxide for soft ferrites should have firm and clear markings, including the manufacturer's 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 magnesium oxide for soft ferrites shipped out of the factory should be accompanied by a quality certificate. The content includes the manufacturer's name, 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 magnesium 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 method should comply with the provisions of Type B in GB/T8946. The net weight of each bag of this product is 20kg. 6.4 The packaging of magnesium oxide for soft ferrites is done by manually tying the inner bag with vinyl rope or a rope of equivalent quality, or sealing it with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the edge of the bag, and the opening is sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the edge of the bag. 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 Magnesium oxide for soft ferrites should be covered during transportation to prevent rain and moisture. 6.6 Magnesium oxide for soft ferrites should be stored in a cool, dry place to prevent rain and moisture.
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