用N235从大洋多金属结核萃铜余液中萃取钴

Study on Selective Extracting Co with N235 from Cu Extraction Raffinate of Ocean Polymetallic Nodules

研究了用N235从大洋多金属结核熔炼-锈蚀-萃取工艺中所产出的萃铜余液中萃取分离钴的方法。实验结果表明,N235萃取钴效果明显,负载有机相中的钴能被稀酸反萃完全。采用N235萃取和稀酸反萃方法可以把Co(Ⅱ)、N i(Ⅱ)分离开。从含钴0.85 g/L的料液中,按相比VO/VA=1/2,经四级逆流萃取,二级反萃可将钴富集到15.20 g/L,萃余液中含钴0.0055 g/L,萃余液中N i/Co高达1 838,反萃液中Co/N i=1 520,产品质量符合优质工业氯化钴质量要求,钴镍萃取分离效果甚佳,钴的回收率大于98%。

The extraction of Cobalt from the Cu extraction raffinate from melting-rusting-solvent extraction circuit with N235 for Ocean Polymetallic Nodules was studied.The experimental results demonstrate an excellent performance of N235 for Cobalt extraction,while Cobalt can be completely reverse extracted from loaded organic phase by dilute acid.Cobalt（Ⅱ） and Ni（Ⅱ） can be separated from each other by the processes of extraction with N235 and re-extraction with dilute acid.The solution containing 0.85 g/L of Co at a phase ratio VO/VA=1/2 was processed by four-stage countercurrent extraction and two-stage re-extraction,cobalt can be concentrated to be 15.20 g/L.While the extraction raffinate containing 0.0055 g/L of Co.Ni/Co in the extraction raffinate is up to 1838 and Co/Ni in re-extraction solution is 1520.The recovery rate of Co is more than 98%,indicating a good separating result for Co and Ni.The product also meets the standard for high-quality cobalt chloride for industry.