Potassium fluoride,anhydrous
           Potassium fluoride,extra pure
           Potassium fluoride,Granular
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           Hydrofluoric acid
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           Ammonium bifluoride
           Potassium Bifluoride
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           Sodium fluoride
           Potassium Fluorosilicate
           Fluorosilicic Acid
           Sodium silicofluoride
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           Magnesium fluorosilicate
           Barium Fluoride
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University Department of Materials Engineering Laboratory, the powder in the acid leaching, the use of hydrochloric acid - hydrofluoric acid mixing method, can be purified SiO2 at atmospheric pressure, at room temperature. Since hydrofluoric acid etching of SiO2 has a role, not only can the particle surface iron impurities SiO2 and other metallic impurities are removed, and the particles of the fluid inclusions inside the solid inclusions and impurities removal effect is also very good. Given the limited capacity of hydrofluoric acid dissolution, particles larger internal dissolution of impurities is difficult, so the purification process scheduled for later on SiO2 ultrafine mineral processing carried out, the finer processing, better purification effect, but must ensure that the process does not etching can not go out with other impurities. University Department of Materials Engineering Laboratory powder using special processes and materials, in a similar way, to achieve a good ultra-fine purification effect, applied to Lianyungang annual 2000t ultra-fine high-purity electronic grade silicon powder production system, make the product the SiO2 purity of 99.9%, the three main products harmful impurities Fe3 +, Cl-, Na + ion content index and conductivity indicators are more than similar products of international quality indicators.

Hydrofluoric acid method: SiO2 hydrofluoric acid treatment can be carried out without heating at room temperature. The washing over SiO2 into hydrofluoric acid solution. If the solution is added 0.02% to 0.2% sodium dithionite, then the mass fraction of hydrofluoric acid solution can be as low as 0.02% to 0.1%. SiO2 stirred in the solution after 5min,

In addition to its iron content by the effect can Fe2O3 0.15%, 0.113%, 0.065%, 0.070%, respectively, decreased to 0.028%, 0.032%, 0.026%, 0.027%. Hubei 40 to 140 mesh SiO2 by a pulse after the flotation, SiO2 content of 99.79%, Fe2O3 content of 0.0026%. Mainly in iron and trace minerals iron exists in the form of machinery and iron. Hydrofluoric acid leaching treatment, and treated with sodium bisulfite as a reducing agent. Acid leaching conditions of 55% hydrofluoric acid in an amount of 16kg / t, sodium bisulfite (solid) in an amount of 16kg / t, acid leach slurry mass fraction of 60%, acid leaching time was 24h. After washing and drying, the resulting high-purity SiO2 yield 97.4%, SiO2 content of 99.82%, Fe2O3 content of 0.00094%.