Quartz sand profile
Jin Lin quartz sand is a hard, wear-resisting, stable chemical properties of silicate minerals, the main mineral composition is SiO2, quartz sand color for the milky white or colorless translucent, mohs hardness 7, sexual brittle cleavage, conchoidal fracture, oily luster, density 2.65, bulk density (1-20 mesh is 1.6), 20-200 mesh is 1.5, the chemical, thermal and mechanical properties has obvious anisotropy, insoluble in acid, slightly soluble in KOH solution, melting point 1750 ℃. Quartz sand is important industrial mineral raw material, the hazardous chemicals, widely used in glass, casting, ceramics and refractories, smelting ferrosilicon, metallurgical flux, metallurgy, construction, chemical, plastic, rubber, abrasive, filter material and other industries.
Quartz purification process
Jin Lin quartz sand in the industrial production to meet the different needs, can through the process of improve its grade. Some purification methods mainly include the following:
1, swab swab desliming - refers to the aid of mechanical force and sand grain peel force to remove the film on the surface of the quartz sand grinding impurity iron, bonding and clay mineral and further chopped into single mineral aggregate, then through classification work to achieve the effect of further refining quartz sand. At present there are mainly rod friction washing and mechanical scrubbing. The main factors influencing the scrubbing effect for scrubbing machine structure characteristic and configuration form; Secondary factors to scrub, scrub time concentration (scrub concentration is 50%, 60%).
2, magnetic separation, magnetic separation is mainly used for removing the magnetic minerals in quartz sand, such as by strong magnetic machine to remove hematite, limonite, biotite weak magnetic minerals, such as the strong magnetic minerals, such as magnetite by weak magnetic separator can be removed.
3, flotation, flotation is used to remove the feldspar, mica quartz sand and so on some magnetic separation to remove impurities, to further improve its purity.
4, acid leaching, acid leaching is the use of quartz insoluble in acid (except for HF acid), the characteristics of mineral and other impurities can be acid to dissolve, can realize further purification of quartz.
5, microbiological leaching, microbial leaching is the use of microorganisms in addition to quartz sand particles on the surface of the film iron or iron and this is a newly developed a kind of iron removal technology.
Classification of quartz sand
1 ordinary quartz sand; SiO2 acuity 90-99% Fe2O3 0.06 or less - 99%; Refractoriness 1750 ℃; Large particles, the surface has yellow skin cyst; Ordinary quartz sand is usually is made of natural quartz ore, after washing, drying, crushing.
2. Refined quartz sand is also called the pickling quartz sand, SiO2 acuity 99-99.5%, Fe2O3 0.005% or less, is made of high quality natural quartz sand, carefully selected, fine processedcasting modelling of quartz sand, etc.
3. High purity quartz sand; SiO2 acuity 99.5-99.9% Fe2O3 0.001% or less, USES the high quality of natural quartz, carefully selected, fine processing and into. Main application: metallurgy, ink silicon carbide, glass and glassware, enamel, cast steel, water filtration, paohuajian, chemical industry, spray noisy, etc.
4. The fused quartz sand; Chemical composition: 99.9 99.95% SiO2, Fe2O3 0.005% to 0.025%. Appearance is colorless transparent block, granular or white powder; Relative weight: 2.21 g/cm3, mohs hardness: 7.0, PH: 6.0.
5. Silicon micro powder; Appearance is gray or gray powder, refractoriness > 1600 ℃, unit weight of 200 ~ 250 kg/m3.
