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A method of recovering indium from complex smelting residue containing indium was investigated. Indium was extracted by technique of low acid leaching and solvent extraction. The conditions of separating iron and indium were studied and the optimal conditions were determined. When the residue is two-class-countercurrent leached with 2 mol/L H2SO4 and 30–40 g/L NaCl at 100 °C, the leaching rate of...
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