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.
Xiaodong GUO Chang WEI Xingbin LI Zhigan DENG Cunxiong LI Gang FAN
. Direct Solvent Extraction of Indium from the Leaching Solution of Zinc Oxide[J]. The Chinese Journal of Process Engineering, 2017
, 17(5)
: 982
-988
.
DOI: 10.12034/j.issn.1009-606X.217119
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