Silicon Dioxide

Silica sand (Silicon dioxide) is quartz particles produced by crushing and processing quartz. Quartz stone is a non-metallic mineral, which is a hard, wear-resistant and chemically stable silicate mineral. The color of quartz sand is milky white, or colorless translucent, Mohs hardness 7.
Quartz sand is an important industrial mineral raw material, non-chemical dangerous goods, widely used in glass, casting, ceramics and fireproof materials, smelting ferrosilicon, metallurgical flux, metallurgy, construction, chemical industry, plastics, rubber, abrasives, filter media and other industries.

Quartz sand is a hard, wear-resistant, chemically stable silicate mineral, its main mineral composition is SiO2, quartz sand color is milky white, or colorless translucent, hardness 7, brittle no cleavage, shell fracture, grease luster, density of 2.65, bulk density (1-20 mesh is 1.6~1.8), 20-200 mesh is 1.5. Its chemical, thermal and mechanical properties have obvious anisotropy, insoluble in acid, slightly soluble in KOH solution, melting point 1750℃.
Common specifications are: 0.5-1mm, 1-2mm, 2-4mm, 4-8mm, 8-16mm, 16-32mm, 10-20 mesh, 20-40 mesh, 40-80 mesh, 100-120 mesh.
Quartz sand is a variant of colorless, transparent quartz, which the Greeks called "Krystallos," meaning "white ice," convinced that quartz is durable and strong ice. Ancient Chinese believed that cold crystals in the mouth could quench thirst. Quartz sandstone is a consolidated clastic rock, quartz debris content of more than 95%, from a variety of magmatic rocks, sedimentary rocks and metamorphic rocks, less heavy minerals, associated minerals for feldspar, mica and clay minerals. Quartzite can be divided into two types of sedimentary origin and metamorphic origin. The former refers to the quartzite ore with deep metamorphism and pure quality, and the boundary between clastic particles and cements is not obvious. Gangue is formed by hydrothermal process, almost all composed of quartz, dense block structure. The mineral content of quartz sand varies greatly, mainly quartz, followed by feldspar, mica, cuttings, heavy minerals, clay minerals and so on.

【 Use 1 】
To be used as dehumidifying desiccant, dehydrating agent, moisture-proof agent and air humidity regulator. Also used for gas drying. It is also used as catalyst and catalyst body, reinforcing agent of silicone rubber, and sizing agent used in textile industry.

【 Use 2 】
Mainly used as liquid adsorbent, desiccant and spice carrier, can also be used as catalyst carrier.

【 Use 3 】
As a hygroscopic agent, its color changes from blue to red with the increase of hygroscopic amount to show the change in the humidity of the space medium of the sealed package.

【 Use 4 】
It is used as catalyst carrier of benzic anhydride, aniline, maleic anhydride, melamine, butadiene rubber, acrylonitrile and other important petrochemical products. It is also widely used for refining petrochemical products, removing aromatics, selective adsorption separation of some organic gases and liquids. It can also be used as an ion exchanger to remove polyvalent harmful elements from water. It is also used for dry storage of materials, instruments and other items and dewatering and refining of high purity gas.

【 Use 5 】
Instead of ethyl silicate for precision casting, in order to reduce production costs, improve the operating environment, improve product quality. Used as a adhesive for refractories and other materials. It is a coating material that prevents the oxidation of certain products. As a coating material (internal and external waterborne coatings) to improve bonding, fastness, wear resistance, pollution resistance. As a synthetic fiber treatment agent to improve the friction coefficient of the fiber. As a warp sizing agent in woolen spinning industry, it can improve spinnability, handiness, reduce flying hair and broken head, and increase production. Used in paper industry to improve paper smoothness and paper strength. It is also used as an abrasive and catalyst for finishing electronic materials, and a coagulant for sulfuric acid in batteries.

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Quartz has a high fire resistance, the industrial quartz sand is often divided into: ordinary quartz sand, refined quartz sand, high purity quartz sand, molten quartz sand and silica powder.

Ordinary quartz sand
Ordinary quartz sand, that is, SiO2≥ 90-99%, Fe2O3≤ 0.06-0.02%, refractoriness 1750℃, appearance: some large particles have yellow skin capsule on the surface. Ordinary quartz sand is generally a kind of water treatment filter material made of natural quartz ore by crushing, washing, drying and secondary screening; The filter material has the characteristics of: no impurities, no edges, high density, high mechanical strength, long service cycle of fouling capacity line, and is an ideal material for chemical water treatment. Grain size range 5-220 mesh, can be produced according to user requirements. Main applications: metallurgy, ink silicon carbide, glass and glass products, enamel, cast steel, water filtration, foam alkali, chemical industry, spray noise and other industries.

Refined quartz sand
Also known as pickling quartz sand, SiO2≥ 99-99.5%, Fe2O3≤0.005%, the use of high-quality natural quartz sand, mortar.

High purity quartz sand
SiO2≥ 99.5-99.9%, Fe2O3≤0.001%, the use of high-quality natural quartz stone, mortar. (mm is millimetres)

Molten quartz 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:
The appearance is colorless transparent block, granule or white powder.
Relative gravity: 2.21.
Mohs hardness: 7.0.
pH value: 6.0.

Silica powder
Silicon powder: the appearance is gray or gray white powder, refractoriness >1600℃. Bulk weight: 200 ~ 250 kg/m3.

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