With the development of alumina varieties, especially the development of chemical alumina, whiteness has become an important quality indicator of the product. Since alumina, aluminum hydroxide and its chemical products industry do not have uniform whiteness determination (industry) standards, production units each implement non-standard internal corporate standards, control over production indicators, disputes over marketing quality, and export product quality agreements. In, it brings many problems. According to the Chinese Nonferrous Metals Industry Association [2002] No. 122, Aluminum Corporation of China Co., Ltd. Shandong Branch was responsible for the drafting of the industry standard YS/T 469 “Alumina, aluminum hydroxide whiteness measurement methodâ€.
This standard adopts and refers to international and national standards and is fully in line with international standards. In order to ensure the reliable traceability of the whiteness test method, the analysis and test data are unified and accurate, and the national solid standard magnesium oxide whiteness standard GSB A 67001 is used as the basis for the calibration of the whiteness meter.
The standard for determining whiteness was reviewed by experts organized by the Nonferrous Metals Light Standards Committee. All representatives agreed that the standard fully adopts the International Commission on Illumination CIE 1964 Supplementary Standard Colorimetric System and related national standards to determine the optical conditions and whiteness of this standard. Representation (calculation) methods, technical conditions are in line with international standards, standard test data are accurate and reliable, and scientific demonstrations are conducted. Comprehensive evaluation of the standard has reached the international advanced level. After the standard drafting unit is revised according to the revision clauses listed in this Minor, it can be issued as a recommendation standard of the People's Republic of China Nonferrous Metals Industry.
After the standard was released, it was quickly promoted in the non-ferrous industry. At present, all product standards involving whiteness have clearly defined the adoption of the YS/T 469-2004 standard. Because of the high starting point of the standard and the internationally accepted whiteness measurement The principle and method are fully integrated and the method is fully tested. From the sampling method, sample preparation (pressing), to the determination of the analyzer, the calibration of the working whiteboard, the calculation of whiteness, etc. Conditions, the use of standards to reach the international advanced level. The implementation of the standard is very significant, especially in international trade, as a scientific and standardized technical platform has been established, the technical content of products has been increased, technical friction has been reduced, and the international market for products has been expanded.
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