有色金属(冶炼部分)

刚果（金）SICOMINES两种氧化铜钴矿1#矿和2#矿的铜、钴品位分别为6.041%、0.08%和3.031%、0.516%。1#矿和2#矿中主要含铜矿物均为孔雀石、硅孔雀石，但1#矿中含钴矿物主要为含钴褐锰矿，以及少量水钴矿，而2#矿中钴矿物主要为钴褐锰矿和水钴矿。浸出试验结果表明，溶液终点酸度、磨矿粒度对两种氧化铜钴矿的铜、钴浸出率影响均不大。不使用还原剂，直接酸浸，1#矿铜、钴浸出率均较高(>85%),2#矿铜浸出率为95%左右，但钴浸出率较低，不到25%，主要是2#矿的溶液电位较高，钴离子在酸性溶液中的溶解度很低，需要被还原溶解到溶液中。通过添加还原剂焦亚硫酸钠，浸出温度控制在60℃，可将2#矿矿石Co浸出率提升至80.47%，但将1#矿与2#矿矿石进行配矿，在不额外添加还原剂，不加温条件下，1#矿对2#矿矿石浸出协同作用明显，可促进2#矿矿石Co的浸出，当配矿分数为50%时，2#矿Co浸出率从22.54%增加到76.04%。

The copper and cobalt grades of the two oxidized copper-cobalt ores, No.1 and No.2, in SICOMINES, the Democratic Republic of the Congo, are 6.041%, 0.08% and 3.031%, 0.516%, respectively. The main copper minerals in both ore No.1 and No.2 are malachite and chrysocolla, but the cobalt minerals in ore No.1 mainly consist of cobalt-bearing braunite and a small amount of cobalt-bearing heterogenite, while the cobalt minerals in ore No.2 are mainly cobalt-bearing braunite and cobalt-bearing heterogenite. The gangue minerals of both are mainly quartz, iron chlorite, etc. The leaching test results indicate that the final acidity of the solution and the grinding particle size have little effect on the leaching rate of copper and cobalt of the two oxidized copper-cobalt ores. Without the use of reducing agents and direct acid leaching yields higher copper and cobalt leaching rates for ore No.1(>85%), copper leaching rate of ore No.2 is about 95%, but the cobalt leaching rate for ore No.2 is relatively low(<25%). This is mainly because the solution potential of ore No.2 is relatively high(～700 mV), the higher solution potential is difficult to meet the reaction requirement of cobalt-bearing phases related to 2# ore. The solubility of cobalt ions in ore No.2 in acidic solutions is very low, so they need to be reduced and dissolved into the solution. By adding the reducing agent sodium metabisulfite and controlling the leaching temperature at 30 ℃, the solution potential is adjusted to 300–380 mV, the Cu leaching rate of ore No.2 is basically unaffected, and the cobalt leaching rate is increased from 23.56% to about 71%. Furthermore, increasing the leaching temperature to 60 ℃ can increase the cobalt leaching rate of ore No.2 to 80.47%. In addition, because the slurry potential of ore No.1 is low and has a certain degree of reducing properties, it is considered to reduce the slurry potential of ore No.2 by adding a certain proportion of ore No.1 or even add additional reducing agents, so as to ensure the recovery rate of cobalt. The results of the ore blending test show, ore No.1 and ore No.2 are mixed, without adding additional reducing agent or heating, the synergistic effect of ore No.1 on the leaching of ore No.2 is obvious, which can promote the leaching of cobalt from ore No.2. When the ore blending fraction of ore No.1 rises from 0 to 50%, the cobalt leaching rate of ore No.2 increases from 22.54% to 76.04%.