针对钴矿石含有大量可溶性碱性脉石的特点,提出酸浸—摇床重选除可溶性碱性脉石的预处理方案,并通过对比试验来验证该方案.结果表明:经过酸浸—摇床重选预处理后,酸浸矿中钙的质量分数由8.61％降至2.87％,去除率达74.32％,而金属钴损失率仅为0.15％.经过酸浸—摇床重选预处理,避免了浸出体系酸度不稳定的情况发生,减少了铁矾沉淀的生成量,同时也避免了硫酸钙沉淀的生成.酸浸矿体系钴回收率为87.7％,较原矿体系提高35.2％,效果良好.经过酸浸—摇床重选预处理不但使该钴矿石适合采用微生物浸出技术回收钴,而且也缓解了该矿山大量硫酸无法消耗的情况.
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