What is quartz sand

Quartz sand is a hard, wear-resistant, chemically stable silicate minerals, the main mineral constituent is SiO2. Quartz sand color variety usually white, colorless, gray. Hardness of 7, brittle, no cleavage, conchoidal fracture. Grease gloss, density 2.65 g / cm3, chemical, thermal and mechanical properties have obvious anisotropy, insoluble in acid, slightly soluble in KOH solution, melting point 1750 ° C. It is piezoelectric.

Main type

Quartz sand can be divided into ordinary quartz sand, refined quartz sand, high-purity quartz sand and fused silica sand according to its quality.

1, ordinary quartz sand:

SiO2≥90~99%, FeO≤0.06~0.02%, refractoriness 1750~1800°C, large part of the appearance, yellow skin encapsulation on the surface. The particle size range is 5~220 mesh, which can be produced according to the user's requirements. Main uses: metallurgy, ink silicon carbide, glass and glass products, enamel, cast steel, water filtration, sodium silicate, chemical, sandblasting and other industries.

2, refined quartz sand:

SiO2 ≥ 99 ~ 99.5%, Fe2O3 ≤ 0.02 ~ 0.015%, selected high-quality ore for complex processing. The particle size range is from 5 to 480 mesh, which can be produced according to user requirements, and the appearance is white or crystalline. Main uses: high-grade glass, glass products, refractory materials, smelting stones, precision casting, grinding wheel and other materials.

3, high purity quartz sand:

SiO2 ≥ 99.5~99.9%, FeO ≤ 0.005%, is made of 1~3 grade natural crystal stone and high quality natural stone, carefully selected and finely processed. Particle size range 1~0.5mm, 0.5~0.1mm, 0.1~0.01mm, 0.01~0.005mm.

4, fused silica sand

Chemical composition: SiO2: 99.9 ~ 99.99%; Fe2O3: 10PPM ~ 25PPM; Max Li2O content: 1 ~ 2PPM; Max Al2O3 content: 20 ~ 30PPM; Max K2O content: 20 ~ 25PPM; Max Na2O content: 10 ~ 20PPM. Physical properties: Appearance is colorless and transparent, granular or white powder. True specific gravity: 2.21; Mohs hardness: 7.0; PH value: 6.0

5, silicon micropowder

Silicon micropowder: Appearance is gray or off-white powder. Refractoriness > 1600 ° C. Bulk density: 200 ~ 250 kg / cubic meter.

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