铜钴浸出渣高纯空气加压浸出工艺

High-purity Air Pressure Leaching Process of Copper-Cobalt Leaching Residue

刚果(金)铜钴矿资源丰富,硫化矿经浮选得到的铜钴精矿主要采用硫酸化焙烧-酸浸工艺进行处理。受矿石成分复杂多变及焙烧操作水平的影响,焙烧酸浸后的浸出渣仍含有较多的铜和钴。针对如何高效回收浸出渣中残存的铜和钴,本文进行了高纯空气加压浸出试验研究。在液固比6∶1、酸矿比60%、浸出温度180℃、高纯空气分压1.1 MPa、浸出4 h的条件下,铜和钴的浸出率分别为91.37%和74.79%,浸出效果不理想。将高纯空气改为纯氧,纯氧分压为0.8 MPa,其他条件不变,铜、钴浸出率分别达到96.31%和98.55%。

Democratic Republic of Congo(DRC)is rich in copper-cobalt ore resources,and the copper-cobalt concentrate obtained by flotation of sulfide ore is mainly processed by the sulfuration roasting-acid leaching process.Affected by the complex and variable composition of the ore and the level of roasting operation,the leaching residue after roasting and acid leaching still contains more copper and cobalt.Aiming at how to efficiently recover the remaining copper and cobalt in the leaching residue,this paper conducted a high-purity air pressure leaching experiment.Under the conditions of liquidsolid ratio of 6∶1,acid-ore ratio of 60%,leaching temperature of 180℃,high-purity air partial pressure of 1.1 MPa,leaching for 4 hours,the leaching rates of copper and cobalt are 91.37%and 74.79%,respectively,and the leaching effect is not ideal.The high-purity air is changed to pure oxygen,the partial pressure of oxygen is 0.8 MPa,other conditions remain unchanged,the leaching rates of copper and cobalt reach 96.31%and 98.55%,respectively.