某铜钴矿的硫酸还原浸出研究

研究了刚果(金)某铜钴矿的硫酸还原浸出。结果表明,在矿样粒度为-0.074mm占90%、终点pH为1.5、SO2用量为理论量的1.5倍(4kg/t)、浸出温度80℃、浸出时间120min、液固比4∶1的条件下,铜、钴浸出率分别达到了93.35%和90.13%。在此基础上进行了模拟堆浸的柱浸试验,柱浸采用先浸铜再还原浸钴的分步浸出方式,铜浸出率达72%,钴浸出率为66%。

Study on Sulfuric Acid Reduction Leaching on Copper-Cobalt Ore

The sulfuric acid reduction leaching on copper-cobalt ore of Congo(DRC)was investigated.The results show that the leaching rate of copper and cobalt reaches 93.35 % and 90.13%respectively under the following conditions including ore particle size of sample of 90%-0.074mm,terminal pH value of 1.5,dosage of SO2of 1.5times of theoretical amount,reaction temperature of 80℃,reaction time of 120 min,and ratio of liquid to solid of 4∶1.Based on the above results,the column leaching test to simulate heap leaching is conducted.The multistage leaching process is adopted to leach copper firstly and then reduction leach cobalt by column leaching process.The leaching rate of copper and cobalt reaches 72% and 66%respectively.