Process development for impurity removal from a tin gravity concentrate |
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| Affiliation: | 1. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;2. Engineering Technology Research Center for Comprehensive Utilization of Rare Earth, Rare Metal and Rare-Scattered in Non-ferrous Metal Industry, CUMTB, Beijing 100083, China;3. Key Laboratory of Separation and Processing of Symbiotic-Associated Mineral Resources in Non-ferrous Metal Industry, CUMTB, Beijing 100083, China;4. Liuzhou China-Tin Nonferrous Design and Research Institute Co. Ltd, CHINA TIN GROUP, Liuzhou 545006, China |
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| Abstract: | A new process for the removal of impurities from tin gravity concentrate using flotation has been developed in this work. Removal of zircon, tantalum and columbite from a tin gravity concentrate has been accomplished by direct tin flotation using a mixture of sulphosuccinate collectors modified with fatty alcohol ester sulphate, and depression of impurities using organic acids and sodium silicate. When using this method, more than 90% of the impurities were removed from the gravity concentrate. The concentrate was upgraded from 58% to approximately 90% SnO2.The major factors affecting selective flotation of tin from tantalum, niobium and zircon were the degree of collector modification, type and amount of depressant, and the flotation pH. The process has been confirmed in a number of continuous batch tests. |
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