期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 18, 期 5, 页码 1262-1268出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(08)60214-9
关键词
alloy scrap; nickel; cobalt; recovery; trialkyl amine
资金
- National Natural Science Foundation of China [47202010, 50725102]
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 degrees C for 3 h; 2) copper replacement by iron scraps under pH value of 2.0 at 80 degrees C, and stirring for 1 h; 3) removal of iron and chromium by chemical precipitation: iron removal under pH value of 2.0 at 90 degrees C by dropwise addition of sodium chlorate and 18% sodium carbonate solution, then chromium removal under pH value of 4.0 at 70 degrees C 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 eletrodeposition 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.
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