刚果(金)某氧化钴矿还原酸浸试验

Study on Acid Reduction Leaching of Cobalt Oxidized Ore from Democratic Republic of Congo

采用亚硫酸钠为还原剂对来自刚果(金)某钴含量为1.10%的氧化钴矿进行了还原酸浸试验研究,考察了还原剂用量、硫酸用量、浸出温度、液固比等因素对浸出率的影响。结果显示:最优浸出条件为:反应温度70℃,液固比1.5,还原剂用量为钴锰完全还原理论用量1.8倍,在此条件下钴的浸出率可达94.86%,锰浸出率97.43%,铁浸出率15.56%,铝浸出率42.53%,浸渣含钴0.059%。对浸出前后的物料进行分析表明,还原酸浸过程充分破坏了金属矿物结构,使有价金属以离子形式进入溶液,实现了有价元素的选择性浸出。

The acid leaching experiments for oxidized cobalt ore which from democratic republic of Congo (DRC) with 1.10% Co was carried out, and sodium sulfite was used as reducing agent. Effects of reducing agent, acid content, temperature, liquid-solid ratio and reaction time on the leaching behaviors were investigated. Results show that the most optimum conditions as follows: liquid-solid ratio 1.5, reaction temperature 70 ℃, reduction agent dosage is 1.8 times of theoretical amount, and the best reaction time was 2 h, under these conditions, the extraction efficiency of Co is as high as 94.86%, and Mn is 97.43%,Fe is 15.56%,Al is 42.53%,cobalt content in residue is 0.059%. The metallic minerals structure was dissociated during reducing leaching process, valuable metals get into solution as form of ions, and the selective leaching of minerals has been realized.