Quartz is one of the most widely distributed non-metallic minerals on the earth's surface, and it is a hard crystalline mineral, which is composed of silicon dioxide. Atoms are connected in the continuous skeleton of SiO4 silicon-oxygen tetrahedron, and each oxygen is shared between the two tetrahedrons, giving the overall chemical formula of SiO2.
Quartz is the second most abundant mineral in the earth's continental crust, second only to feldspar. Colorless and transparent, it often contains a small amount of impurities, and becomes translucent or opaque crystals with hard texture. quartz is a mineral resource with very stable physical and chemical properties, and its crystal belongs to the oxide mineral of tripartite system.
Ordinary quartz sand: SiO _ 2 ≥ 90-99%, FeO≤0.06-0.02%, fire resistance of 1750-1800℃, large particles in appearance, and yellow skin on the surface.
Refined quartz sand: SiO _ 2 ≥ 99-99.5%, Fe2O3≤0.02-0.015%, which is made by carefully selecting high-quality ores for complex processing. The particle size range is 5-480 mesh, and the appearance is white or crystalline.
High-purity quartz sand: SiO _ 2 ≥ 99.5-99.9%, FeO≤0.005%, which is made of grade 1-3 natural crystals and high-quality natural stones through careful selection and fine processing.
Melted quartz sand. Chemical composition: SiO 2: 99.9-99.99%; Fe2O3：10PPM-25PPM； MaxLi2O content: 1-2ppm; MaxAl2O3 content: 20-30 ppm; MaxK2O content: 20-25PPM；; MaxNa2O content: 10-20PPM.
Silicon micropowder, which is gray or off-white in appearance. Fire resistance > 1600℃. Bulk density: 200-250kg/m3.
Metallurgy: quartz, as a type of non-metallic minerals, is mainly used as raw materials, additives and fluxes for manufacturing silicon metal, ferrosilicon alloy and silicon-aluminum alloy.
Glass: As the main raw material for making glass, quartz can be used to manufacture flat glass, float glass, glass products, optical glass, glass fiber, glass instruments, conductive glass, glass cloth and radiation-proof special glass. 3. Architecture: quartz is an important building cornerstone. It can be used to manufacture concrete, cementing materials, road building materials, artificial marble, cement physical performance testing materials, etc.
Chemical industry: Silica can be used to make various silicides, silicates and nitrates, and those with good quality can be used as fillings in acid-resistant sulfuric acid towers.
Jewelry: quartz is actually the mineral name of crystal, which has the same chemical composition. The difference is that gem-grade crystal can be used as a gem material and can be processed into various ornaments. However, most of the dyed polycrystalline quartzite can only be used as imitations of jade, such as jadeite, xiuyan jade and dushan jade. Single crystal quartz can also be cracked first and then dyed to imitate tourmaline and other precious stones.
Aerospace: quartz's internal molecular chain structure, crystal shape and lattice change law. It has high temperature resistance, small thermal expansion coefficient, high insulation, corrosion resistance, piezoelectric effect, resonance and its unique optical characteristics.
