Co、Ni离子分离研究

文档编号:HG234 文档字数:10856,页数:21

摘要：由于钴镍在矿床中常共生、伴生，并随着钴与镍资源的日益枯竭，它们的分离与回收显得十分重要。通过对相关文献进行调研，总结了目前国内外钴与镍的分离与回收技术的现状：目前常用的方法有化学沉淀法、萃取法和树脂法，详细介绍了相关的研究和应用，对其他方法进行了简单介绍，同时介绍了作者的耦合分离技术的设想和实践。将电渗析与萃取耦合，对NiCl2•6H2O与CoCl2•6H2O的混合溶液进行分离。系统地描述了过程行为规律，考察了萃取剂种类、原料浓度、流量、电流强度、加酸方式、循环处理、萃取剂回用等对分离效果的影响，计算了电流效率。结果表明：P507分离效果好于P204；原料液浓度低、电流强度小、流量适中和一次加酸方式有利于分离；过程可以采用多级操作即料液循环、萃取剂经重新皂化回用；电流效率大于80%。
关键词：钴； 镍； 电渗析； 萃取； 分离

Abstract:  As Co and Ni are often symbiosised or associated in deposit and their resources are shortage, become the separation and recovery of Co and Ni more important Through the investigation of relative literatures, the technical status at home and abroad is summarized. The current conventional methods have chemical precpitation ,extraction and ion-exchange resin. The related research and application are introduced in detail. The other methods are simple introduced. Meanwhile the author’s ideas and practice of coupling separation technology are introduced.The extraction was coupled with electrodialysis.  The mixed solution of NiCl2 • 6H2O and CoCl2 • 6H2O were separated.  The rules of the process behavior were descripted systematically. The effects of separating conditions, such as the types of extractant, the concentration of raw materials, the flow rate, the current strength, the way of adding acid,recycling treatment, the reusing of extractant, The results indicated that the separating effect of P507 was better than P204; low concentration of raw materials and small current strength and moderate flow rate and at one time adding were favorable to separated; the process could  be multiple operated, the feed solution was cycle, the extractant was re-saponification to reuse; the current efficiency was more than 80%.
Key words: Cobalt;  Nickel;  Electrodialysis ; Extraction;  Separation

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