Copper, Indium Extraction And Separation From Copper, Indium, Zinc Solution

This paper is directed to a kind of copper, indium, zinc and other metal ion-containing solution from which the extraction of copper and indium were researched. Finally, after experimental research, all of the extraction process parameters were obtained.The paper first has elaborated the chemical and physical properties of copper and indium, their uses, the extraction method of solvent extraction, and on this basis, launched a detailed introduction about the experiment which includes previous preparation, plan, process, results analysis, and conclusion, etc.Extraction of indium was to use P204extraction agent, extraction of copper was to use domestic extraction agent ZJ988. Firstly the experiment explored the extraction sequence. After extraction from stock solution respectively, it is found that the rate of phase separation will be extremely slow which takes1hour or so if the first extraction of indium, on the contrary, while extracted copper after indium extraction, the rate of phase separation will be very quick which takes less than a minute.Secondly for the copper extraction and stripping experiments, the condition experiments for obtaining the optimal parameters and the multi-stage counter current extraction experiments which simulate industrial continuous production all have been carried out respectively. The final result shows that the optimal parameters for copper extraction at room temperature are40%of organic phase concentration, the phase ratio of O/A=3:1.3minutes of mixing time,3minutes of phase separation time, five stage counter current extraction. Extraction rate of copper can be achieved more than99%with these conditions, and zinc and indium, almost no losses in the aqueous phase so as not to affect the subsequent extractions. With acidic copper sulfate solution as the stripping solution, the optimal conditions for stripping of40%copper loaded organic phase are200-220g/L of sulfuric acid concentration,5-10g/L of Cu+content, the phase ratio of O/A=1:(1-2),3minutes of mixing time,3minutes of phase separation time. Using seven stage counter current extraction, stripping rate of copper can reach more than95%. The last is the research on the extraction of indium; the factors of organic phase concentration, mixing time and phase ratio were all be investigated respectively at room temperature. It is concluded that the best conditions for extraction rate of indium are20%of organic phase concentration,3-4minutes of mixing time, the phase ratio of O/A=1:1-1:4,2minutes of phase separation time and a single extraction rate of indium can reach above98%under these conditions. While adopting seven or more countercurrent extraction methods under the condition of the phase ratio of O/A=1:4-1:6, the extraction rate of indium can reach more than98%also, this method has reduced the consumption of the P204extraction agent. With HCl solution as the stripping solution of indium, the optimal conditions for stripping indium are the phase ratio of O/A=1:1,2minutes of mixing time,4mol/L of hydrochloric acid concentration,2minutes of phase separation time.The process used in this study has the following advantages:(1) First separation of copper, next extraction of indium, finally zinc which remains in solution is concentrated and crystallized, as a result, these three metals all have been fully recovered.(2) The multi-stage countercurrent extraction method which is used for the extraction has good operability and high feasibility, and the environmental pollution is small, the cost is low, the recovery effect is good.