刚果(金)某氧化钴矿还原酸浸试验

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。

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

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.