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石英砂提纯
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石英砂提纯工艺及设备
Crushing and Screening Stage - The initial step involves selecting high-purity, low-gray particles from larger ore types like quartzite, followed by crushing using jaw or cone crushers, ensuring the desired particle size through a closed-loop system with vibrating screens [2] - The crushed product is then processed in a sand-making machine to obtain quartz sand of specific granularity [2] Grinding Stage - Quartz sand grinding typically employs a single-stage or two-stage overflow ball mill, with the second stage forming a closed-loop cycle with a spiral classifier or hydrocyclone to ensure the required fineness [3] Beneficiation Stage - To achieve high-purity industrial quartz sand, further purification processes are necessary after obtaining quartz sand of a certain granularity, including washing, classification, scrubbing, magnetic separation, flotation, and acid leaching [4] - Washing and classification are essential to remove clay and impurities, as the quality of quartz sand decreases with smaller particle sizes [4] - Scrubbing utilizes mechanical force to remove iron films or adhering impurities from quartz particles, followed by separation of finer particles using a hydrocyclone [4] - Magnetic separation effectively removes weakly magnetic impurities like hematite and biotite, using wet permanent magnetic drum separators for weak magnetic and high-gradient magnetic separators for strong magnetic separation [4] - Flotation aims to remove non-magnetic impurities such as feldspar and mica, with HF commonly used as an activator in the process [5] - Acid leaching exploits the solubility properties of quartz to separate and purify it, as quartz is nearly insoluble in common acids except for HF [5] - Microbial leaching is an emerging technique that uses specific microorganisms to remove iron films from quartz sand, showing promising results in laboratory settings but requiring further industrial research [5]