Recovery of zinc,gallium and indium from La Oroya zinc ferrite using Na 2 CO 3 roasting

Abstract

Process flowsheets for the recovery of zinc, indium and gallium from La Oroya zinc ferrite residue (19˙5%Zn, 26˙6%Fe, 0˙052%Ga, 0˙075%In) using Na₂CO₃ roasting are proposed. While several leaching flowsheets are discussed, the flowsheet where zinc ferrite is roasted with Na₂CO₃ and MnCO₃, followed by two stages of leaching (hot water and H₂SO₄), iron reduction and precipitation of In and Ga as hydroxides, Fe as FeOOH and zinc as basic zinc sulphate from solution appears to be the most promising option for metals recovery from this material using Na₂CO₃ roasting. Sulphuric acid for leaching may be regenerated using either Na₂SO₄ metathesis or solvent extraction/ion exchange and Na₂CO₃ can be recovered for recycle to roasting from solution using precipitation and calcination of NaHCO₃. Future research on these potential flowsheets is required, including possible methods for the recovery of iron, silver and gallium from the various process streams.

Keywords

ZINC GALLIUM INDIUM ZINC FERRITE SODIUM CARBONATE ROASTING METALS RECOVERY FLOWSHEET DEVELOPMENT

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