复杂氧化铜矿堆浸生产实践

赞比亚某复杂氧化矿采用堆浸方式回收铜资源。但由于当地降雨量大,矿石粉矿率高、且易于泥化等因素,导致浸出渗透性差、生产无法连续,以及矿堆边坡不稳定等问题出现。通过技术创新,实现了全年连续性浸出生产,各项经济指标均得到大幅提升。浸出率由66.41%提高到77.90%,比设计值高出5.9个百分点,每年多产3 000t铜;酸耗由4.61t/t降低到2.87t/t,吨铜成本节约近200美元;同时,闭堆周期由695d降到407d,大大提高了浸出效率。

Plant Practice of Complex Oxide Ore Heap Leaching

Copper was recovered from complex oxide ore in Zambia by heap leaching. However, high prevalent rainfall and ore fines, and easy argillization, bring about difficulty of percolation of irrigation solution through heap pad, continuous production is not reliable with instability of stockpile slope. Implementation of technological innovations makes it possible to ensure continuous production with remarkable productivity. Copper recovery improved from 66.41% to 77.90% with 5.9 percent points higher than the design value and increase of copper production by 3 000 tonnes per annum. Sulfuric acid consumption drops from 4.61 t/t to 2.87 t/t copper. The overall cost of one ton copper reduces $200 and irrigation period reduces from 695 days to 407 days. Leaching efficiency is improved greatly.