低品位氧化铜钴矿堆浸试验研究

Heap Leaching of Low-Grade Copper-Cobalt Oxide Ore

对刚果(金)某低品位氧化铜钴矿资源进行了堆浸试验研究,考察了喷淋强度、喷淋酸度和矿石粒度对铜钴浸出率的影响。结果表明,喷淋酸度和喷淋强度对铜钴浸出速度和累计浸出率影响显著,而矿石粒度对浸出过程影响不大。确定了低品位氧化铜钴矿适宜的堆浸条件为:喷淋酸度20 g/L,喷淋强度15 L/(m^(2)·h),矿石粒度-40 mm。在此条件下,堆浸100 d,铜和钴累计浸出率分别可达90.89%和82.27%。

A heap leaching test was carried out for the low⁃grade copper⁃cobalt oxide ores from Congo(DRC),and effects of spray intensity,spray acidity and ore particle size on the leaching rates of copper and cobalt were investigated.The results show that both acidity and intensity of spray bring significant impact to the speed and cumulative rates of copper and cobalt leaching,while the ore particle size has little effect on leaching process.And finally,the optimal conditions for heap leaching of low⁃grade copper⁃cobalt ore were determined,including spray acidity at 20 g/L,spray intensity of 15 L/(m^(2)·h),and ore particle size of less than 40 mm.It is shown that the cumulative leaching rates of copper and cobalt can reach 90.89%and 82.27%,respectively,after 100 days of heap leaching.