安徽太湖脉石英制备高品质电子级硅微粉的试验研究

Experimental Study on Preparation of High Quality Electronic Grade Silicon Powder from Vein Quartz in Taihu Anhui Province

以安徽太湖脉石英为原料,通过工艺矿物学对矿物成分及组成特征进行分析,矿物经破碎、磨矿、水力分级、磁选及硫酸擦洗后获得高品质石英精砂,化学组成为:SiO_(2),99.90%;Al_(2)O_(3),0.050%;Fe_(2)O_(3),0.0019%,进一步对石英砂采用无污染磨矿、去离子水清洗及KH-570改性后,粉体萃取液电导率3.01μs/cm,粉体活化指数82.3%,指标高于电子工业部SJ/T10675—2002中电子级活性硅微粉质量要求。

High quality electronic grade silica powder was prepared from Taihu vein quartz in Anhui province.The mineral composition and gangue mineral composition characteristics were analyzed by process mineralogy.After crushing,grinding,hydraulic classification,magnetic separation and sulfuric acid scrubbing,the minerals obtained high-quality quartz fine sand.The chemical composition was:SiO_(2),99.90%;Al_(2)O_(3),0.050%;Fe_(2)O_(3),0.0019%.Then the quartz sand was further cleaned by non pollution grinding,deionized water and modified by KH-570.The conductivity of the extraction liquid of the powder was 3.01μs/cm,and the activation index of the powder was 82.3%,which was higher than the quality requirements of the electronic grade active silicon micro powder in SJ/t10675—2002 issued by the ministry of electronic industry.