Quartz is a hard, wear-resistant, chemically stable silicate mineral. Its main mineral component is SiO2. The color of quartz is milky white or colorless and translucent. The hardness is 7, it is brittle and has no cleavage. It has a shell-like fracture. Grease luster, density is 2.65, its chemical, thermal and mechanical properties have obvious anisotropy, insoluble in acid, slightly soluble in KOH solution, melting point 1750℃.
High-purity quartz is the main raw material for the production of high-performance materials such as monocrystalline silicon, polycrystalline silicon, quartz glass, optical fibers, solar cells, and integrated circuit substrates. High-purity quartz sand is mainly used in industries such as quartz glass and IC integrated circuits, and its high-end products are widely used in large-scale and ultra-large-scale integrated circuits, optical fibers, lasers, military and aerospace industries. The importance of high-purity quartz also lies in the preparation of metal silicon for polycrystalline silicon, making it a key raw material for crystalline silicon and its solar photovoltaic industry.
Mineralization type of quartz ore
Quartz mineral resources that can be used as industrial applications in nature are generally collectively referred to as siliceous raw materials, and mainly include vein quartz, quartzite, quartz sandstone, powder quartz and natural quartz sand, and natural crystal and granite. "High-purity quartz raw material" refers to natural quartz mineral resources whose SiO2 purity can be purified to 99.9% or above by the existing mature mineral processing technology. The purified high-purity quartz sand meets the strict requirements of current high-tech industries.
Initially, high-purity quartz generally uses natural crystal as raw material, and then it can meet the quality index requirements after being selected and purified. However, in the world, there is a shortage of high-grade quartz raw materials, and the reserves of natural crystal are declining year by year, which is expensive and gradually exhausted. Therefore, it is of great significance to use other siliceous mineral resources to replace natural crystal stones. Vein quartz, quartzite and quartz sandstone are common natural quartz mineral resources. As industrial minerals, they have been used in traditional industries such as glassware, refractory products, and building materials for many years. These quartz raw materials have also become the research objects of smelting crystal substitute raw materials.
There are big differences in the scale of quartz deposits of different geological origin types, the composition and structure of quartz ore, and the crystal structure, crystal chemistry, grain size and shape of quartz minerals. Therefore, the industrial application of quartz is closely related to its mineralization type, and different mineralization types of quartz have different application characteristics. Therefore, how to develop and utilize quartz in a targeted manner according to the characteristics of different industrial types of mineral deposits is related to the success or failure of quartz material technology and projects. At the request of colleagues in the industry, China Powder Network is scheduled to hold the "2018 Second Quartz Fine Processing and Application Technology Exchange Conference" on November 21-22, 2018. At that time, Professor Wang Ling will bring a wonderful report on "Industrial Types and Application Features of Quartz Deposits".
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