广西某高岭土尾矿经擦洗、磨矿、分级、强磁选可产出SiO2品位达99.82％的石英砂,但其Fe2O3含量较高,为113μg／g,且铁主要赋存于云母和电气石中.为将该石英砂的Fe2O3含量降至80μg／g以下以满足光伏产业用石英砂的要求,对其进行了除铁即脱除云母和电气石的浮选试验.试验结果表明:先在pH =2.5的酸性条件下用混合胺和煤油进行1次云母反浮选,然后在pH=7.8的偏碱性条件下用油酸钠进行1次电气石反浮选,所得最终石英砂的Fe2O3含量可降至74 μg/g,SiO2品位提高至99.89％,SiO2回收率为94.61％.%The slag of kaolin in Guangxi after scrubbing,grinding,classification,high intensity magnetic separation,can produce the quartz sand with SiO2 99. 82% ,but the content of Fe2O3 is high to 113 μg/g,and the iron hosts in the mica and tourmaline. The flotation test was carried out to remove iron in the mica and tourmaline,to make the Fe2 O3 content in quartz sand decrease to 80 μg/g and meet the requirements of the photovoltaic industrial. The results show that; first,mica reverse flotation was carried out in the acidic condition of pH =2. 5 by using mixed amine and kerosene,and then tourmaline reverse dotation was carried out under the subalkaline condition of pH = 7. 8 by using sodium oleate,the Final proceeds of the Fe2 O3 content of the quartz sand can be reduced to 74 μg/g,the purity of SiO2 can be increased to 99. 89% ,and the recovery rate of SiO2 is 94. 61%.
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