非洲某氧化铜钴矿高效浸出钴铜的工艺研究

Study on high efficiency leaching process of cobalt and copper from a copper-cobalt oxide ore in Africa

针对非洲某氧化铜钴矿还原浸出工艺,研究了矿样粒度、单还原剂和双还原剂、硫酸浓度、浸出时间、浸出温度、液固比等因素对钴铜浸出率的影响。结果表明:双还原剂优于单还原剂;最佳工艺条件为:球磨矿样粒度120目,加入浓硫酸使其质量浓度为0..15g/L;按照先后顺序加入自来水体积8%的双氧水+矿样质量10%的亚硫酸钠,液固比为5∶1,浸出温度70℃,浸出时间30min。钴、铜浸出率分别为99.01%和98.44%,浸出渣中w(Co)为0.12%、w(Cu)为0.052%。该最佳工艺条件可适用于非洲w(Co)为0.62%~8.88%的复杂品位氧化铜钴矿,尤其是低品位氧化铜钴矿处理。

Cobalt and copper were leached from a copper-cobalt oxide ore in Africa with reductive acid leaching method.The effects of sample size,single reductant and double reductant,sulphuric acid concentration,leaching temperature,leaching time and liquid-solid ratio on the leaching rates of cobalt and copper were investigated.The results showed that the double reductant was superior to the single reductant.The optimal conditions are as follows: the ore particles size was 120 mesh,the concentration of H2SO4 was 0.15 g/L,8% hydrogen peroxide by volume of tap water and 10% sodium sulfite by mass of ore sample were added in sequence;the liquid-solid ratio was 5∶ 1,leaching temperature was 70 ℃,the leaching time was 30 min.Under these conditions,the leaching rates of cobalt and copper were 99.01% and 98.44% respectively.The cobalt and copper content in leaching residue were 0.12% and 0.052% respectively.The optimal conditions can be applied to the complex grade copper-cobalt oxide ore with the cobalt content of 0.62%-8.88% in Africa,especially the low-grade copper-cobalt oxide ore.