Experimental Study on the Preparation of High Purity Quartz Sand from Lepidolite Tailings
With the rapid development of strategic emerging industries such as semiconductors and photovoltaics,quartz resources,as the key basic raw materials,have become increasingly scarce.Efficient separation and purification based on low-quality quartz sands in tailings can effectively alleviate the shortage of high-purity quartz resources in China.The beneficiation test of quartz sand from lithium mica tailings in Jiangxi Province was carried out,and the influence of different factors on the purification of quartz sand was studied via"magnetic separation-scrubbing-flotation-acid leach-ing".The results showed that SiO2 content in quartz sand increased from 73.75%to 99.90%while the total contents of impurity elements in concentrate decreased to 977.83 μg/g,Fe2O3 content decreased from 0.42%to 87.21 μg/g,and Al2O3 content decreased from 14.28%to 584.12 μg/g,the Fe2O3 and Al2O3 removal rates were 97.91%and 99.59%,respectively,the purification effect was good and the concetrate met the quality requirements for photo-voltaic sand in JC/T 2314-2015"Silicon based Raw Materials for Photovoltaic Glass".Therefore,this study is conducive to promoting the comprehen-sive utilization of lithiumite associated quartz ore and increasing the value of associated quartz ore.
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