JB/T 5893.4-1991 Gongxian Special Grade Alumina Powder for Electrical Porcelain JB/T5893.4-1991 Standard Download Decompression Password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
Raw Materials for Electrical Porcelain
1 Subject Content and Scope of Application
Gongxian Special Grade Alumina Powder
JB/T5893.4-91
This standard specifies the technical performance indicators, test methods, acceptance rules and storage and transportation procedures of Gongxian QLM-1 special grade alumina powder (abbreviated as alumina powder) in Henan Province.
This standard is applicable to Gongxian QLM-1 special grade alumina powder, a raw material for the manufacture of aluminum high-strength electrical porcelain. 2 Reference standards
GB2009
GB5689
GB6900.16900.11
GB7322
JB/T5893.5
3 Terminology
3.1 High-alumina bauxite
Sampling and preparation methods for bulk bauxite
General provisions for packaging, marking and quality certificates of metallurgical mineral productsChemical analysis methods for clay and high-alumina refractoriesTest methods for refractoriness of refractory materials
Test methods for physical properties of raw materials for electrical porcelain
Sedimentary rocks rich in aluminum minerals, the main mineral components of which are diaspore and boehmite. 3.2 QLM-1 Special Grade Alumina Powder
High-quality high-alumina alumina clinker sintered at a temperature above 1450℃, fine powder obtained by jet milling after coarse and fine crushing. Other terms are the same as those specified in JB/T5893.3. 4
Technical Indicators
The chemical composition of alumina powder shall comply with the provisions of Table 1. Sio
The physical properties of alumina powder shall comply with the provisions of Table 2. Item
True density
Table 1 Chemical composition
Cao+Mgo
Table 2 Physical properties
Particle size
>63μm,
4.3 The total amount of corundum and mullite in the main crystal phase of alumina powder shall be ≥80% 5 Test method
5.1 The chemical composition analysis of alumina powder shall be carried out in accordance with GB6900.1~6900.11. Approved by the Ministry of Machinery and Electronics Industry on October 24, 1991 K0+Na0bZxz.net
Magnet aspirated content
Refractory
Implemented on October 1, 1992
JB/T5893.4-91
5.2 The physical property test of alumina powder shall be carried out in accordance with JB/T5893.5. 5.3 The refractoriness test of alumina powder shall be carried out in accordance with GB7322. 5.4 X-ray diffraction method is recommended for the main crystal phase inspection of alumina powder. Inspection rules
The quality of alumina powder shall be inspected by the technical inspection department of the supplier in accordance with this standard. Alumina powder leaving the factory shall meet the requirements of this standard. 6.1
6.2 Each batch of alumina powder shall be inspected in accordance with the provisions of Article 4.1. Article 4.3 of this standard stipulates the irregular inspection items, and the supplier shall provide an appraisal report. Batch: Each batch shall not exceed 200t, and each batch shall be an inspection unit. 6.3
6.4 The sampling of alumina powder shall be carried out in accordance with GB2009, or no less than 20 bags shall be randomly sampled from each batch, and the total amount of samples shall not be less than 5kg. 6.5 If the purchaser has any objection to the quality of alumina powder, or the inspection result does not meet the standard, it shall be submitted to the supplier within one month after receiving the alumina powder, and the supply and demand parties shall jointly conduct re-inspection in accordance with the provisions of this standard. 7 Storage, transportation and quality certificate.
Storage, transportation and quality certificate shall be carried out in accordance with the provisions of GB5689. o
Additional remarks:
This standard was proposed by the National Technical Committee for Standardization of Insulators and is under the jurisdiction of the Xi'an Electric Ceramics Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Xi'an Electric Ceramics Research Institute. The main drafter of this standard is Zhou Ruxin.
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