Production process of preparing high-purity silica by virtue of quartz sands
A technology of silica and production technology, which is applied in the chemical industry, sustainable manufacturing/processing, inorganic chemistry, etc., and can solve the problems such as difficulty in guaranteeing the purity of high-purity ultra-fine quartz powder, large differences in impurity content, and large consumption of coal and natural gas , to achieve the effect of reducing energy consumption, improving purity and reducing corrosion
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Embodiment 1
[0026] A production process for preparing high-purity silicon dioxide from quartz sand, comprising the following steps: 1) crushing; 2) calcining; 3) water quenching; 4) grinding; 5) magnetic separation; 6) electrostatic separation; 7) pickling ; 8) cleaning with deionized water; 9) drying;
[0027] Wherein, in the process 1), while pulverizing, abrasive materials are added for scrubbing and desliming, and the abrasive materials include: 20wt% boron carbide, 30wt% silicon carbide and 50wt% corundum;
[0028] In operation 3), the liquid used for water quenching is an aqueous solution comprising 0.5wt% potassium chloride and 0.2wt% ferric nitrate; when water quenching, an ultrasonic instrument is arranged in the liquid used for water quenching, and the ultrasonic frequency of the ultrasonic instrument is 150Hz;
[0029] In process 9), the heat used for drying comes from the waste heat in the calciner in process 2), and a heat collecting cabin is arranged on the outer wall of th...
Embodiment 2
[0033] A production process for preparing high-purity silicon dioxide from quartz sand, comprising the following steps: 1) crushing; 2) calcining; 3) water quenching; 4) grinding; 5) magnetic separation; 6) electrostatic separation; 7) pickling ; 8) cleaning with deionized water; 9) drying;
[0034]Wherein, in the step 1), abrasives are added for scrubbing and desliming while pulverizing, and the abrasives preferably include: 25wt% boron carbide, 40wt% silicon carbide and 35wt% corundum.
[0035] In operation 3), the liquid used for water quenching is an aqueous solution comprising 1.5wt% potassium chloride and 0.4wt% ferric nitrate; during water quenching, an ultrasonic instrument is arranged in the liquid used for water quenching, and the ultrasonic frequency of the ultrasonic instrument is 200Hz.
[0036] In process 9), the heat used for drying comes from the waste heat in the calciner in process 2), and a heat collecting cabin is arranged on the outer wall of the calcinin...
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