The unique physical and chemical properties of quartz sand make quartz sand play an important role in aviation, aerospace, electronics, machinery, and the rapidly developing IT industry nowadays. Especially, its intrinsic molecular chain structure, crystal shape and lattice change rule make quartz sand have high temperature resistance, low thermal expansion coefficient and high insulation. Edge, corrosion resistance, piezoelectric effect, resonance effect and its unique optical properties.
　　Refractories are mainly composed of quartz sand. They have the characteristics of compact structure, obvious coagulation effect, continuous self-cleaning and filtration, reducing the suspended solids (SS) content of raw water and long service life. According to various needs, different additives are added scientifically. The advantages are low price, good acid resistance and non-sticking slag. Refractory quartz sand is a necessary material for lining of induction furnace for metal smelting.
　　The main technical indexes of quartz sand as refractory are as follows:
　　SiO2 > 97.5%
　　Al2O3:0.7-0.3%
　　Fe2O3:0.4-0.1%
　　H_2O is less than 0.5%.
　　Bulk bulk density: 1.9 - 2.1g/cm.
　　Liner bulk density: 1.75 - 1.8g/cm.
　　Fire resistance: A [1500 - 1700 degrees].
　　Refractory: H, C [1300 - 1450 degrees]
　　Particle size: 5.1 - - - 0.021 mm.
　　Refractory quartz sand is widely used in power frequency, intermediate frequency, frequency conversion and core induction furnace lining for melting black and non-ferrous metals. The reason why quartz sand can be used as refractory is that the physical and chemical indexes of quartz sand below 1750 degrees Celsius are very stable. The quartz sand filter material is white and is a kind of crystal. It is a kind of white spherical crystal under normal conditions. High purity quartz sand is mainly used in the blasts and glazes of porcelain, high silica bricks for kilns, ordinary silica bricks and silicon carbide.