Introduction
Pickling quartz sand
Pickling quartz sand is wet pickling, which uses various acids. Such as hydrochloric acid, sulfuric acid, oxalic acid, hydrofluoric acid, etc. Wet crushing is adopted before pickling, and some of them are broken by mechanical method, such as hammer crushing. In this way, the crushed materials contain a large amount of mechanical iron. Mechanical iron and quartz sand react slowly in water. Generally, mechanical iron will be oxidized into trivalent iron and turn red and yellow after several days. After soaking in acid, the oxidation rate of iron in bare air is faster
technological process
Quartz sand crushing - water washing - magnetic separation - acid leaching - water washing - dehydration - drying
After the broken quartz sand is washed with water, some impurities can be removed. Magnetic separation can remove more than 99% of mechanical iron. Acid leaching can add various acids according to the actual situation. Acid leaching equipment must be acid and alkali resistant plastic containers, and stainless steel is not recommended. Some acids corrode stainless steel. If conditions permit, it is recommended to use a reactor or a container with heating and stirring. Make the acid leaching more thorough and the reaction more sufficient. Water washing also needs to be stirred to clean thoroughly.
Detailed introduction
In order to eliminate the surface adsorption of quartz sand raw material quartzite and diatomite carrier and reduce chromatographic peak delamination, the carrier needs to be pickled before production and processing. Pickling is to soak the carrier with 6mol / L hydrochloric acid for 2h or heat it with concentrated hydrochloric acid for 30min, filter it, wash it with water to neutral and dry it. Pickling can remove iron and aluminum from the surface wait.
Refined quartz sand is a kind of silicate mineral with hard, wear-resistant and stable chemical properties. Its main mineral component is SiO2. The color of quartz sand is milky white, or colorless and translucent, with hardness of 7, brittleness, no cleavage, shell fracture, grease luster and density of 2.65, The bulk density (1-20 mesh is 1.6 and 20-200 mesh is 1.5). Its chemical, thermal and mechanical properties have obvious anisotropy. It is insoluble in acid and slightly soluble in KOH solution. The melting point is 1750 ℃
