以铁尾矿为原料,研究了矿中SiO2的NaOH浸出过程,确定了铁尾矿用碱(NaOH)浸出过程中,影响SiO2浸出率的主要因素为:铁尾矿和NaOH与水的固液比,浸出反应温度,浸出反应时间.以此为条件,研究了铁尾矿在碱溶液中浸取SiO2反应的动力学行为.结果表明:铁尾矿中SiO2浸出的最佳因素为,固液比1:2,反应温度110℃,反应时间6 h.SiO2的浸出动力学过程可用界面反应模型来描述,其浸出反应动力学方程为1-(3-X)2/3+2(1-X)=k＂2t,表观活化能约为14.2 kJ/mol,属于固体内扩散控制.
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