The main specifications and standards of quartz sand

2021-10-08

Quartz has high fire resistance. In the industry, quartz sand is often divided into: ordinary quartz sand, refined quartz sand, high-purity quartz sand, fused quartz sand and silica powder.

1. Ordinary quartz sand: SiO2≥90-99% Fe2O3≤0.06-0.02%, refractoriness 1750℃, some large particles in appearance, yellow skin cysts on the surface. The particle size range is 5-220 mesh, and can be produced according to user requirements. Main applications: metallurgy, ink silicon carbide, glass and glass products, enamel, cast steel, water filtration, soda, chemical, spray and other industries.

2. Refined quartz sand: SiO2≥99-99.5％, Fe2O3≤0.02—0.015%, which is made of carefully selected high-quality ore for complex processing.

The particle size range is 5-480 mesh, which can be produced according to user requirements, and the appearance is white or crystalline. Main applications: high-grade glass, glass products, refractory materials, smelting stones, precision casting, grinding wheel grinding materials, etc.

3. High-purity quartz sand: SiO2≥99.5-99.9% Fe2O3≤0.005%, which is made of 1-3 grade natural crystal stones and high-quality natural stones, after careful selection and fine processing. The particle size range is 1—0.5mm, 0.5—0.1mm, 0.1—0.01mm, 0.01—0.005mm, and can be produced according to user requirements.

4. Fused silica sand: chemical composition:
SiO2 99.9-99.95%
Fe2O3 5PPM-25PPM max
Li2O 1-2PPM max
Al2O3 20-30PPM max
K2O 20-25PPM max
Na2O 10-20PPM max (PPM is one part per million)

Physical properties:
Appearance is colorless transparent block, granule or white powder.
Relative proportion: 2.21;
Mohs hardness: 7.0;
PH value: 6.0;
Five, silicon powder
Silica powder: The appearance is gray or off-white powder, and the refractoriness is >1600°C. Bulk density: 200～250 kg/m3. The chemical composition of silicon powder is shown in the following table:
Project  SiO2 Al2O3 Fe2O3 MgO CaO NaO PH
Average 75～96% 1.0±0.2% 0.9±0.3% 0.7±0.1% 0.3±0.1% 1.3±0.2% neutral