Separation And Recovery Of Indium And Copper In Reductive Leaching Solution Of High - Iron Sphalerite

High quality zinc resources peter out with the development and utilization of zinc resources, in order to meet the requirements of raw materials, the development and utilization of high iron sphalerite aroused people’s attention. In this paper, the reduction leaching liquid in zinc hydrometallurgical process of high iron sphalerite of copper indium-rich have been researched. Two methods of direct extraction of indium-direct extraction of copper and cementation copper-extraction of indium have been used to separate and recover copper and indium efficiently. The main results obtained are as follows:The behavior of extraction indium and copper from high marmatite reduction leaching liquid in direct extraction of indium-direct extraction of copper process have been studied. The results show that P204is good selective extraction indium, basic not extraction of bivalent iron and copper, indium. The optimum extraction condition is organic phase composition15%P204+85%sulfonated kerosene, solution pH value of0.5, phase ratio (A/O) of2:1, stirring speed of1000r/min, mixed time of1min. The indium extraction rate is above98%and Indium iron separation factor reached more than10000and the separation of indium copper coefficient reached more than7000. The optimum stripping condition is hydrochloric acid concentration4mol/L, zinc chloride concentration of lmol/L, stirring speed1200r/min, stripping time of5min, phase ratio (O/A)4:1. The indium stripping rate is above99%. The results show that N902is good selective extraction copper from the solution after extratting indium. The opimum contion of extraction copper is organic phase composition15%P204+85%sulfonated kerosene, solution pH value of2.0, phase ratio (A/O) of2:1, stirring speed of1000r/min, mixed time of4min. The copper extraction rate is above98%and copper iron separation factor reached more than3200. The optimum condition of stripping copper is sulfuric acid concentration of2mol/L, phase ratio (O/A) of4:1, stirring speed of1000r/min, stripping time of8min. The copper stripping rate is above98%.Cementation copper-extraction of indium have been used to separate and recover copper and indium efficiently. In the method of cementation copper-extraction the behavior of the iron cementation copper and liquid extraction of indium have been investigated. The results show that copper has a good iron sedimentation effect, also can achieve a better reduction of ferric iron. The optimum condion of cementation is temperature of80℃, adding iron coefficient of1.1, reaction time of20min, stirring speed of400r/min. Research results show that copper precipitation rate is above99%in the best experimental conditions of iron cementation copper, the grade of copper is high in slag, indium loss rate is about0.9%, the iron grade in copper slag is1～3%, ferric iron is reducted basicly, only a few milligrams of copper in the sink copper solution is suit the requirements of the follow-up processing. The solution after cemetation copper without the need for pH adjustment is used to directly extract using P204-hydrochloric acid stripping indium. The optimum extraction condition is organic phase composition15%P204+85%sulfonated kerosene, solution pH value of0.5, phase ratio (A/O) of2:1, stirring speed of1000r/min, mixed time of1min. The indium extraction rate is above98%and Indium iron separation factor reached more than10000. The optimum stripping condition is hydrochloric acid concentration4mol/L, zinc chloride concentration of1mol/L, stirring speed1200r/min, stripping time of5min, phase ratio (O/A)4:1. The indium stripping rate is above99%.Two methods of comprehensive analysis shows that two methods can separate and recycle copper and indium efficielly in high marmatite reduction leaching liquid. Through the comparative analysis, the cementation copper-extraction method of indium economic cost is low, technology is relatively simple, the solution is easily disposed in the subsequent processing, on craft is a matur.