Theme content and scope of application This standard specifies the classification, technical requirements, test methods, inspection rules and signs, packaging, transportation and storage of calcined a-alumina products.
This standard applies to the use of industrial aluminum hydroxide or industrial alumina as raw materials, at a suitable temperature, calcined stable a-type alumina products. Mainly used for the production of raw materials such as ceramics and refractory materials.
2 Reference standards
Determination of GB 6523 Alumina Powder Effective Density Pycnometer Method
GB 6609.2^-6609.5 Alumina chemical analysis method
GB 8170 Numerical Rounding Rules
3 Product classification According to different physical and chemical indicators, the product is divided into low sodium type and medium sodium type, a total of 7 brands.
4 Technical requirements The physicochemical indexes of various brands of products should meet the requirements in Table 1.
4.2 Appearance is a white crystalline powder.
4.3 When there are special requirements for dopants, impurities, etc., the supply and demand parties shall jointly negotiate and resolve.
5 test methods
5.1 Chemical composition analysis method according to GB6609.2 ~ 6609.5.
5.2 true density test method according to GB 6523
5.3 Determination of a-Al2O3, according to Appendix A.
6 Inspection Rules
6.1 The product is inspected by the supplier's technical supervision department to ensure that the product meets the requirements of this standard and fills in the quality certificate
6.2 The acquirer may inspect the received product. If the inspection result is inconsistent with the provisions of this standard, it shall be submitted to the supplier within one month from the date of receipt of the product. The supply and demand shall be settled through consultation.
6.3 The product shall be submitted for acceptance in batches. Each batch consists of the same mixture.
6.4 Each batch of products shall be sampled according to the same brand number before leaving the factory. Each batch weight does not exceed 20t. Sampling should be representative, continuous sampling can also be taken from 20 different parts of the same amount of sample, the total amount of not less than 5 kg. The content of a-Al2O3 is only type analysis.
6.5 Mix the product sample obtained in 6.4, and divide it into four parts to a weight of not less than 1kg. Divide into 3 parts, two of which are for inspection and the other sealed for 3 months for future reference.
7 signs, packaging, transportation, storage
7.1 The logo product packaging should have obvious signs. Indicate: supplier name, product name, registered trademark, brand name, batch number, weight, and date of manufacture. When bulk, submit the same card with the same content.
7.2 Packing Product packaging uses packaging materials with sufficient strength and density and does not contaminate the product. The weight of each bag is 5 okg ± 5kg. It can also be negotiated by the supply and demand sides and other appropriate weights and packaging materials or bulk packaging.
7.3 Transport of transportation products, loading and unloading of non-permissive impurities, and measures for protection against moisture and rain
7.4 Stored products should be stored in batches and in separate storerooms in warehouses that are not subject to moisture. They must not be mixed and must not be mixed with impurities.
7.5 Quality Certificates Each batch of products should be accompanied by a quality certificate stating:
a. supplier name;
b. Product name and brand number;
c. lot number;
d. Analysis of test results and technical supervision department certification;
e. the standard number;
f. Factory date.
Folding knife, a kind of knife, can be folded. The folding knife is mainly connected with a knife body which can be rotated into by a pivot assembly at the front end of the handle. The knife body is provided with a safety buckle relative to the side of the knife body, and an elastic strip relative to the back end of the knife body. The back end of the knife body is provided with a stop part and a stop concave part which can be butted by the elastic strip, and the safety buckle has a tilted elastic buckle part, The elastic strip is arranged in the holding chamber of the handle, one end of which is fixed, and the other end of which is connected with the stop part of the tool body, so as to provide the thrust to assist the rotation of the handle when the tool body is rotated out of the handle, In addition to the simple semi-automatic operation mode of turning out and positioning by using the elastic auxiliary push knife body, the overall thickness of the folding knife is reduced by the refined and simplified structural design, which is convenient for the collection and carrying of the folding knife and makes the operation of the folding knife easier.
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