The revision of the “tungsten concentrate†industry standard was recommended by the Secretariat of the Rare Metals Sub-Committee to be included in the 2005-2006 revision plan project. According to the project requirements, Zhangzhou Nonferrous Metallurgy Research Institute organized relevant departments and personnel to carry out their work earnestly. On the basis of the revised opinions on more than 30 representative mines and smelting enterprises across the country, the colored standard “Tungsten†was completed. Pre-review of the mine.
The standard of "tungsten concentrate" was released after the standard cleaning and rectification in 1994, and the original national standard "Tungsten Concentrate Technical Conditions" was renumbered. The technical content and standard text were unchanged. The original standard has been released and implemented for more than 20 years, which is quite different from the current actual situation of production and trade. The tungsten concentrate has not been exported. Tungsten resources, especially black tungsten resources, have gradually decreased, and the level of domestic smelting technology has been greatly improved. Most of the tungsten concentrate production mines and smelting enterprises are no longer strictly enforced. Many companies have proposed amendments to tungsten Mine's standard requirements.
The revised “Tungsten Concentrate†pre-review draft has adjusted the original standard variety from 20 to 15, and the special grade only retains one black and white tungsten concentrate, cancels the third category, and adds the third and fourth grades. Grade 5 and tungsten fine mud types; the chemical composition of each variety has been modified accordingly. The revised "Tungsten Concentrate" new standard will promote the comprehensive utilization level of China's tungsten resources, improve the recovery rate of tungsten mines, improve the technical level of tungsten smelters, and improve the overall economic benefits of the tungsten industry. effect.
Lamp accessories are various parts and accessories used to install, secure and connect lighting fixture. They play an important role, not only to ensure the normal operation of the lamp, but also to improve the use effect and aesthetics of the light.
There are many materials for making lamp accessories, generally speaking, there are metal, plastic, glass, ceramics, etc. Metal generally has a long service life, corrosion resistance, and should not be aged, such as iron product lamps, which have a long service life; Plastic lighting product have a short use time, a faster aging speed, and are easy to deform when heated; The service life of glass and ceramic lighting is long as well.
Nowadays, the lighting and lighting accessories industry uses metal materials as the most widely used base, generally used materials are zinc alloy, aluminum alloy, steel, stainless steel, etc. The use of technology is mainly electroplating, painting, oxidation and electrophoretic coating. With the current people to lighting accessories product performance requirements and environmental awareness improved, electrophoretic coating process has gradually become the preferred process for surface treatment of lighting accessories.
Lighting Accessories,Lamp Accessories,lighting fixtures bathroom
Zhengdong Lighting Co., Ltd. , https://www.sundint.com