Quartz sand purification is removal of a small amount of impurities and the high difficulty separation technique to obtain refined quartz sand or high purity quartz sand. The purification technologies of quartz sand at home and abroad are washing, classifying and desliming, scrubbing, magnetic separation, flotation, acid leaching, microbial leaching, etc.
The SiO2 grade in quartz sand decreases by quartz sand size becoming finer, so washing and desliming of crude quartz sand is necessary before next step.
Scrubbing is the way to remove film iron and impurity minerals on the surface of quartz by mechanical force and crush these mineral aggregate. The quartz sand gets further purification by classification. There are two kinds of methods, including rod scrubbing and mechanical scrubbing.
The separation of mica and quartz is difficult, but there are two effective methods: anionic collector in acid condition and anionic - cationic collector in alkaline condition. The purification of quartz sand can reach 99% after scrubbing, desliming, magnetic separation and flotation.
Dilute acid had a significant effect on removing iron and aluminum, and concentrated acid for the removal of titanium and chromium, and mixed acid for mineral impurity. Control various factors of acid leaching should be based on quartz final grade requirements, and as far as possible reduce the acid concentration, temperature and dosage to achieve quartz purification.
Quartz sand ore in a certain place in Yunnan is mainly composed of quartz, accounting for 95-97%, siliceous cement accounting for 8-23%, and impurity minerals are mainly hematite, limonite, etc., accounting for about 1-3%. The original concentrator adopts the screening and classification-dry magnetic separation-dosing strong scrubbing-flotation process, the final SiO2≥97.62%, Fe2O3≤0.24, Al2O3≤1.11%, the indicators are poor, which seriously affects the production indicators and economic benefits. Therefore, the processing plant entrusted Xinhai to do technical transformation. Xinhai decided to adopt the beneficiation process of screening and classification-dry magnetic separation-dosing strong scrubbing-acid leaching through beneficiation experiments, and the quality index of the obtained fine sand was excellent.
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