江西某锂云母尾矿制备高纯石英砂试验研究

Experimental Study on the Preparation of High Purity Quartz Sand from Lepidolite Tailings

随着半导体、光伏等战略新兴产业的高速发展,其关键基础原材料石英资源变得愈发紧缺,对尾矿中的低品质石英砂进行高效分选提纯,可有效缓解我国高纯石英资源短缺的局面。本试验对江西某锂云母尾矿中的石英砂进行选矿试验研究,采用“磁选-擦洗-浮选-酸浸”试验工艺流程,研究不同试验因素对石英砂提纯效果的影响。结果表明,石英砂中SiO_(2)含量(质量分数,下同)由原矿73.75%提至99.90%,精矿总杂质元素含量降至977.83μg/g,其中Fe_(2)O_(3)含量从0.42%降至87.21μg/g,Al_(2)O_(3)含量从14.28%降至584.12μg/g,去除率分别为97.91%与99.59%,提纯效果较好,满足JC/T 2314—2015《光伏玻璃用硅质原料》对光伏砂质量要求。本研究有利于提升锂云母伴生石英矿的综合利用,提高伴生石英矿的价值。

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 leaching".The results showed that SiO_(2) content in quartz sand increased from 73.75%to 99.90%while the total contents of impurity elements in concentrate decreased to 977.83μg/g,Fe_(2)O_(3) content decreased from 0.42%to 87.21μg/g,and Al_(2)O_(3) content decreased from 14.28%to 584.12μg/g,the Fe_(2)O_(3) and Al_(2)O_(3) removal rates were 97.91%and 99.59%,respectively,the purification effect was good and the concetrate met the quality requirements for photovoltaic sand in JC/T 2314—2015"Silicon based Raw Materials for Photovoltaic Glass".Therefore,this study is conducive to promoting the comprehensive utilization of lithiumite associated quartz ore and increasing the value of associated quartz ore.