Separation of Nickel and Cobalt from Nickel Chloride Solution by P204+N235 Combined Extraction Process
Combined extraction of nickel and cobalt from nickel chloride solution using di(2-ethylhexyl)phosphonic acid(P204)and triisooctylamine(N235)as extractants was studied.The effects of organic phase P204 volume fraction,phase ratio,solution pH,saponification rate,organic phase N235 volume fraction,Cl-mass concentration,and reaction temperature on the purification and impurity removal of nickel chloride solution were investigated.The results show that after removing impurities by P204 extraction,N235 is used to extract cobalt and molybdenum from P204 raffinate,the mass concentrations of Ni2+is 218.10 g/L,and the mass concentrations of Cu2+,Fe3+,Co2+,and Zn2+in the residual solution 1.1,1.2,1.0 and 0.1 mg/L,respectively,under the conditions of 20％volume fraction of P204 in the organic phase of the P204 extraction and impurity removal process,VO/VA=1.5/1,raw material solution pH=3.5,saponification rate of 50％,reaction temperature of 40～50 ℃,and N235 volume fraction of 16％in the organic phase of the N235 extraction process,VO/VA=1.2/1,Cl-mass concentration≥280 g/L,reaction temperature of 40～50 ℃,P204 Raffinate pH=3.0,and hydrochloric acid acidification concentration of 3 mol/L,which can meet the requirements of producing high quality electrodeposited nickel cathodes.
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维普
