广西某高岭土尾矿产石英砂浮选除铁试验

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113 μg/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80 μg/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%。

Experiment of Iron Removal by Flotation from the Quartz sand Produced by the Slag of Kaolin in Guangxi

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 Fe₂O₃ 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 flotation was carried out under the subalkaline condition of pH=7.8 by using sodium oleate, the final proceeds of the Fe₂O₃ 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%.