Abstract:Address to high content of water-soluble zinc in Pb-Ag residue and jarosite residue produced by zinc hydrometallurgy, washing-purification-solvent extraction process was adopted to recover zinc. Effects of reaction temperature, acidity and time on zinc recovery were investigated to obtain the optimum process conditions. Zinc recovery in Pb-Ag residue and jarosite residue is 61.4% and 79.6% respectively when washing is carried out at room temperature with L/S=5, washing water acidity of 5 g/L and washing time of 30 min. Solution after washing is neutralized and purified with hydrated lime as neutralizer by controlling final pH value at 4.0. Iron in solution can be completely precipitated and removed, while zinc loss is 0.9% below. Zinc extraction rate of three-stage countercurrent extraction is 96% above under the conditions including organic phase composition of 30% P204+70% sulfonated kerosene, extraction ratio O/A=2/3, and extraction time of 3 min. Zinc-rich solution is obtained by stripping with zinc electrowinning lean solution. This hydrometallurgical process is simple in operation and realizes resource utilization of water-soluble zinc entrained in zinc leaching residues. It can be integrated with the original zinc process.