Abstract：In order to improve the comprehensive recovery rate of indium from the zinc hydrometallurgy process, a direct solvent extraction process was employed to selectively extract indium from the leaching solution of zinc oxide. The extraction rates of indium and other ions with P204 were studied under different parameters such as concentration of extractant, contact time, acid concentration, and temperature. Besides, the effects of concentration of HCl and phase ratio on the stripping rate of indium were carried out. Extraction and stripping isotherm were prepared to determine the number of stages required for quantitative extraction and stripping of indium at the chosen aqueous to organic phase ratio (A/O ratio). A pilot test and continuous countercurrent extraction test were developed to study the behavior of various metal ions. Quantitative indium was extracted by 10% P204 with three stages countercurrent extraction at A/O ratio of 2/1. The extraction rate of indium reached 99.9%, while the extraction rates of iron, zinc and cadmium were 1.5%, 0.5% and 1.1%，respectively. Indium in the P204 loaded organic was effectively stripped by 6 mol/L HCl with four stages at A/O ratio of 1/5 and the stripped organic phase can be reused in the extraction process.
郭小东 魏昶 李兴彬 邓志敢 李存兄 樊刚. 次氧化锌酸性浸出液中直接萃取铟[J]. 过程工程学报, 2017, 17(5): 982-988.
Xiaodong GUO Chang WEI Xingbin LI Zhigan DENG Cunxiong LI Gang FAN. Direct Solvent Extraction of Indium from the Leaching Solution of Zinc Oxide. Chin. J. Process Eng., 2017, 17(5): 982-988.
Kang H N, Kim K Y, Kim J Y. Recovery and purification of indium from waste sputtering target by selective solvent extraction of Sn[J]. Green Chem., 2013, 15(8): 2200-2207.
Alfantazia A M, Moskalykb R R. Processing of indium: a review[J]. Miner. Eng., 2003, 16 (8): 687-694.
Lupi C, Pilone D. In (III) hydrometallurgical recovery from secondary materials by solvent extraction[J]. J. Environ. Eng., 2014, 2(1):100-104.
He J, Wang R X, Liu W. Recovery of indium and lead from lead bullion[J]. J. Cent. South Univ. Technol., 2008, 15(6):835-839
Zhu G C, Zheng M D, Fan G L, et al. Recovering indium with sulfating roasting from copper-smelting ash[J]. Rare Metals, 2007, 26(5): 488-491.
Liu Q, Yang S H, Chen Y M, et al. Selective recovery of lead from zinc oxide dust with alkaline Na2EDTA solution[J]. Trans. Nonferrous Met. Soc. China, 2014, 24(4):1179-1186
Pathak A, Roy A, Manna M. Recovery of zinc from industrial waste pickling liquor[J]. Hydrometallurgy, 2016,163(S1): 161–166.
Zhang Y Y, Li X H, Pan L P, et al.. Studies on the kinetics of zinc and indium extraction from indium-bearing zinc ferrite[J]. Hydrometallurgy, 2010, 100(3):172-176
Zeng D M, Hu A P, Shu W Y, et al.. Study on the method of recovering and separating indium from residue containing indium[J]. J. Cent. South Univ. Technol., 2002, 9(2): 104-106.
Li X B, Deng Z G, Li C X, et al. Direct solvent extraction of indium from a zinc residue reductive leach solution by D2EHPA [J]. Hydrometallurgy, 2015, 156(1): 1-5.
Lee M S, Ahn J G, Lee E C. Solvent extraction separation of indium and gallium from sulphate solutions using D2EHPA[J]. Hydrometallurgy, 2002, 63(3):269-276
Long H Z, Chai L Y, Qin W Q, et al. Solvent extraction of zinc from zinc sulfate solution[J]. J. Cent. South Univ. Technol., 2010, 17(4):760-764
2017, Vol. 17 
