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首页> 外文期刊>Separation and Purification Technology >Selective recovery of nickel and cobalt from cobalt-enriched Ni-Cu matte by two-stage counter-current leaching
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Selective recovery of nickel and cobalt from cobalt-enriched Ni-Cu matte by two-stage counter-current leaching

机译：两阶段逆流浸出从富钴镍铜雾中选择性回收镍和钴

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摘要

This work presents investigations on the selective recovery of Ni and Co from Ni-Cu matte by two-stage counter-current leaching.The investigations indicated that the sulphuric acid used during leaching can be fully replaced by sulphur.The leaching behavior of nickel and cobalt were determined and the influences of temperature,the amount of sulphur and oxygen pressure on leaching process were also investigated.A pilot plant experiment was carried out to confirm the developed process.It is found that,under two leaching conditions:(1) Ambient pressure leaching:sulphur coefficient = 1.15,T=85±5°C and time = 2.5 h with a liquid to solid ratio of 5:1 (i.e.,L/S = 5:l),and (2) Elevated pressure leaching:L/S = 5:1,T= 150 ± 5 °C,pressure = 1.45 MPa,air flowrate = 1500 ± 50 N m3/h and time = 6 h;the achieved recoveries of Ni and Co were >96.02%.The ratio of Cu/Ni is higher than 45 in the resulting residue,which is favorable for effective recovery Cu by simple H2SO4 leaching followed by electrowinning step to obtain copper metal.Therefore,the leaching liquor can be used to recover Ni and Co after removal of iron and Cu can be extracted from the residue.
机译：这项工作提出了通过两阶段逆流浸出从Ni-Cu磨砂中选择性回收Ni和Co的研究，研究表明浸出过程中使用的硫酸可以被硫完全替代。镍和钴的浸出行为确定了试验条件，并研究了温度，硫和氧气压力的量对浸出过程的影响。进行了中试实验，以验证开发的过程。发现在两种浸出条件下：（1）环境压力浸出：硫系数= 1.15，T = 85±5°C，时间= 2.5 h，液固比为5：1（即，L / S = 5：l），（2）高压浸出：L / S = 5：1，T = 150±5°C，压力= 1.45 MPa，空气流量= 1500±50 N m3 / h，时间= 6 h; Ni和Co的回收率> 96.02％。残留物中Cu / Ni的含量高于45，这有利于通过简单的H2SO4浸提然后电沉积来有效回收Cu因此，在除去铁后，可使用浸出液回收镍和钴，并从残留物中提取铜。

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