Comprehensive Recovery of Indium,Germanium and Gallium from Indium Slag
Journal Title: 河南科技大学学报（自然科学版） - Year 2017, Vol 38, Issue 2
Abstract
The scattered rare metals( In,Ge and Ga) were comprehensively recovered from indium slag via a series of processes including acid leaching,the extraction of indium and gallium,and the precipitation of germanium. The optimum parameters were attained. The effects of leaching temperature,leaching time and initial mass fraction of sulfuric acid on the leaching rates of In,Ge and Ga were investigated. The leaching effects of In,Ge and Ga are optimal when the leaching temperature is 80 ℃,and the leaching time is 80 min,and the initial mass fraction of sulfuric acid is 180 g / L. In and Ga were extracted with the organic phase( 30%P204 + sulfonated kerosene) and the other one( 10% P204 + 1. 5% YW100 + sulfonated kerosene),respectively. The influences of the phase ratio O / A,mixing time and inctial acidity of feed liquid on the extraction rates of In and Ga were studied. The results show that the extraction rates of In and Ga are 88. 5%and 77. 2% respectively under each optimum extraction conditions,such as O / A at 1∶ 1,mixing time of 5 min,and the initial acid pH = 0. 2 for In,and O / A at 1∶ 1,mixing time of 3 min,pH = 0. 5 for Ga. The parameters of Ge precipitation temperature,pH value,stirring time and tannic acid ratio also had effects on the precipitation rate of Ge. The optimum parameters of Ge precipitation process are that the precipitation temperature is 70 ℃,and the value of pH is 2. 5,and the stirring time is 10 min and the tannins-to-germanium ratio is 20∶ 1.
Authors and Affiliations
Liuliang DING, Wei LIU, Mingyi GUO, Xinling DU, Jiwen LI
Keywords
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