通过正交试验,研究了红土镍矿高浓度碱浸脱硅过程中浸出温度、碱初始浓度、浸出时间、碱矿质量比对SiO2提取率的影响.结果表明,影响SiO2提取率的主次顺序为浸出温度＞碱初始浓度＞浸出时间＞碱矿质量比;并得到优化的浸出条件为:浸出温度220℃,碱初始浓度85%,浸出时间90min,碱矿质量比5∶1.在溶出过程探讨了加水量、时间和洗涤次数对SiO2提取率的影响,并确定了一次溶出两次洗涤的工艺.
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