High silicon iron tailings were treated by acid leaching process to prepare Fe2O3 and SiO2 powders, which can be used as industrial materials. The optimum process conditions are as follows: reaction temperature 100 ℃, reaction time 90 min, median diameter of iron tailings 6.19 μm, volume fraction of hydrochloric acid 60%. Under these conditions, the yield of SiO2 product (the mass ratio of SiO2 in the product to that in the iron tailings) is 98. 2% , and its quality can meet the standard of YB/T 115 -2004 for sign SF96; the yield of Fe2O3 product is 78. 8% , and its quality can meet the standard of GB1863 -89.%采用酸浸法处理高硅铁尾矿,制备工业原料Fe2O3和SiO2微粉.最佳工艺条件为:反应温度100℃,反应时间90 min,铁尾矿中位粒径6.19 μm,盐酸体积分数60%.在上述最佳条件下,制备的SiO2产率(所得产品中SiO2的质量占原铁尾矿中SiO2质量的比例,下同)达98.2%,品质达到YB/T 115-2004《不定形耐火材料用二氧化硅微粉》中SF96牌号的要求;制备的Fe2O3产率为78.8%,品质符合GB1863-89《氧化铁红颜料》的要求.
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