Recovery of Co(Ⅱ) and Ni(Ⅱ) from hydrochloric acid solution of alloy scrap  

作　　者：申勇峰 薛文颖 牛文勇 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University [2]School of Material and Metallurgy,Northeastern University [3]State Key Laboratory of Rolling and Automation,Northeastern University

出　　处：《中国有色金属学会会刊：英文版》2008年第5期1262-1268,共7页Transactions of Nonferrous Metals Society of China

基　　金：Projects(47202010, 50725102) supported by the National Natural Science Foundation of China

摘　　要：A hydrometallurgical process was developed for recovery of nickel and cobalt from the hydrochloric acid leaching solution of alloy scraps.The process consists of five major unit operations: 1) leaching with 6 mol/L hydrochloric acid under the L/S ratio of 10:1 at 95 ℃ for 3 h; 2) copper replacement by iron scraps under pH value of 2.0 at 80 ℃,and stirring for 1 h; 3) removal of iron and chromium by chemical precipitation: iron removal under pH value of 2.0 at 90 ℃ by dropwise addition of sodium chlorate and 18% sodium carbonate solution,then chromium removal under pH value of 4.0 at 70 ℃ by addition of nickel carbonate solution,stirred by air flow for 2 h; 4) selective separation of cobalt from nickel by extraction using 30% trialkyl amine+50% kerosene (volume fraction) and tri-n-butylphosphate (TBP) as a phase modifier with the O/A ratio of 2:1,and stripping of cobalt with 0.01 mol/L HCl; 5) crystallization of nickel chloride and electrodeposition of cobalt.It is found that the nickel recovery of 95% and the cobalt recovery of approximately 60% with purity over 99.9% are obtained by this process.A hydrometallurgical process was developed for recovery of nickel and cobalt from the hydrochloric acid leaching solution of alloy scraps. The process consists of five maj or unit operations： 1） leaching with 6 mol/L hydrochloric acid under the L/S ratio of 10：1 at 95 ℃ for 3 h; 2） copper replacement by iron scraps under pH value of 2.0 at 80 ℃, and stirring for 1 h, 3） removal of iron and chromium by chemical precipitation： iron removal under pH value of 2.0 at 90 ℃ by dropwise addition of sodium chlorate and 18% sodium carbonate solution, then chromium removal under pH value of 4.0 at 70 ℃ by addition of nickel carbonate solution, stirred by air flow for 2 h; 4） selective separation of cobalt from nickel by extraction using 30% trialkyl amine＋50% kerosene （volume fraction） and tri-n-butylphosphate （TBP） as a phase modifier with the O/A ratio of 2：1, and stripping of cobalt with 0.01 mol/L HCl; 5） crystallization of nickel chloride and electrodeposition of cobalt. It is found that the nickel recovery of 95% and the cobalt recovery of approximately 60% with purity over 99.9% are obtained by this process.

关 键 词：合金废料 镍 钴 回收利用 三烃基胺 

分 类 号：TF803.2[冶金工程—有色金属冶金]