Abstract: The extraction of the cations such as Fe²⁺,Mn²⁺,Zn²⁺ and In³⁺ in the simulated sulfate solution by P₂04 has been examined from a technology solution-reduction solution with adding manganese,that was obtained by reduction of the high leached solution in the hydrometallurgy of zinc without iron residue.The optimum separation conditions have been determined as:(1) component of the organic phase being 30% kerosene+ 70% sulfidized kerosene,(2) extraction temperature being 20 ℃,（3）progressions being 3,(4) ratio of O/A being 3∶1,and (5) extration time being 5 min.Under the optimum extraction conditions,the extration rate of indium is not less than 99.4%.the saturated capacities of P₂0₄ on In³⁺,Zn²⁺ and Mn²⁺ were measured for 54.0 mg·mL^-1，22.0　mg·mL^-1　and 2.0　mg·mL^-1respectively.The direct recovery rate of indium for the whole flow sheet arrived at 77.58% and the total recovery rate reached 95.0%,In comparision with the traditional flow sheet the total recovery rate of indium was higher than 20%.

Key words: indium, etraction, hydrometallurgy of Zinc, without iron residue