Integrated Leaching of Cobalt Hydroxide Intermediate and Nickel-cobalt Sulfide Intermediate
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摘要:
研究了氢氧化钴中间品和硫化镍钴中间品联合氧化还原浸出，在较佳反应条件下，硫化镍钴中间品与氢氧化钴中间品质量比1/5、反应初始酸度为4 mol/L、反应温度为70 ℃、反应液固比为3∶1、反应时间为2.5 h，氢氧化钴中间品中锰的浸出率和硫化镍钴中间品的利用率分别达到99.92%和90.65%。本工艺避免了氢氧化钴中间品单独浸出的还原剂消耗和硫化镍钴中间品单独浸出的氧化剂消耗，实现了氢氧化钴中间品和硫化镍钴中间品协同浸出，且操作简便，适于工业生产应用。
Abstract:The integrated leaching of cobalt hydroxide intermediate and nickel-cobalt sulfide intermediate was studied. The experimental results show that the recovery of manganese in cobalt hydroxide intermediate and the utilization of nickel and cobalt sulfide intermediate were 99.92% and 90.65%, respectively, at the optimum conditions including quality ratio of cobalt hydroxide intermediate and nickel-cobalt sulfide intermediate of 1/5, initial acidity of reaction of 4 mol/L, reaction temperature of 70 ℃, liquid-solid reaction ratio of 3:1 and reaction time of 2.5 h. The residue could be used for leaching cobalt hydroxide intermediate as reductant. The objective of integrated leaching of cobalt hydroxide intermediate and nickel-cobalt sulfide intermediate was attained without the addition of any other oxygenant or reductant. Most importantly, the integrated process leaching is simple and feasible to operate and suitable for industrial production.
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表 1 氢氧化钴中间品和硫化镍钴中间品主要化学成分
Table 1. Main chemical composition of cobalt hydroxide intermediate and nickel-cobalt sulfide intermediate
干基/% 水分
/%Ni Co Mn Fe Cu Si 氢氧化钴 0.32 25.45 8.54 1.81 0.36 0.69 33.74 硫化镍钴 30.61 16.97 <0.001 59.95 
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表 2 优化条件下实验结果
Table 2. Test results at optimum conditions
序号 浸出液 浸出渣 钴中间品
Mn浸出率
/%NiS利
用率
/%pH值 金属合量/（mol/L） 渣率
/%Ni
/%Co
/%Mn
/%1 1.36 1.98 3.22 9.83 9.45 0.10 99.93 90.63 2 1.30 1.99 2.87 8.35 7.43 0.12 99.93 88.69 3 1.27 2.04 3.18 7.82 8.33 0.13 99.91 92.64 平均 — — 3.09 — — — 99.92 90.65
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