两段沉淀法处理刚果(金)低品位氧化钴矿制备粗制钴盐的研究
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摘要
以刚果(金)低品位氧化钴矿冶炼过程净化后液为原料,提出了采用两段逆流沉淀法制备高品质粗制氢氧化钴的新工艺,并考察了影响沉淀过程的各种因素。试验结果表明,在反应时间2.5 h、反应温度25℃、氧化镁的加入量为溶液中钴的摩尔量的1.6倍、氯化铵的加入量为溶液中钴的摩尔量的0.4倍、搅拌速度350 r/min的条件下,钴沉淀率为99.29%,所得氢氧化钴中镁含量为1.50%。
The two-stage precipitation process was applied to product high-quality crude cobalt salt with purified solution as raw material,which formed during smelting process of low-grade cobalt oxide ore in Congo(Kinshasa),and the relevant factors influencing the process of precipitation were investigated.The experimental results show that under the optimum conditions,including the reaction time of 2.5 h,the reaction temperature of 25℃,the amount of magnesium oxide is 1.6 times of cobalt molar quantities in solution,the amount of ammonium chloride is 0.4 times of cobalt molar quantities in solution,and the stirring speed is up to 350 r/min,the precipitation rate of cobalt is 99.29% and the content of magnesium in cobalt hydroxide is 1.50%.
The two-stage precipitation process was applied to product high-quality crude cobalt salt with purified solution as raw material,which formed during smelting process of low-grade cobalt oxide ore in Congo(Kinshasa),and the relevant factors influencing the process of precipitation were investigated.The experimental results show that under the optimum conditions,including the reaction time of 2.5 h,the reaction temperature of 25℃,the amount of magnesium oxide is 1.6 times of cobalt molar quantities in solution,the amount of ammonium chloride is 0.4 times of cobalt molar quantities in solution,and the stirring speed is up to 350 r/min,the precipitation rate of cobalt is 99.29% and the content of magnesium in cobalt hydroxide is 1.50%.
引文
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[4]刁微之,徐远志,马启坤,等.粗氢氧化钴中钴的提取工艺及生产实践[J].云南冶金,2001,30(2):31-35.
[5]阮书锋,居中军,李强,等.活性氧化镁从硫酸盐介质中选择性沉淀镍钴的研究[J].有色金属(冶炼部分),2013(9):1-3.
[6]邓永贵,尹少林.利用低活性工业氧化镁从低浓度浸出液中制取粗制钴盐[J].工业技术创新,2017,4(3):39-42.
[7]张军.硫酸钴溶液除镁试验研究与应用[J].化工管理,2017(33):223.