Method for reducing ferric ions in pickle liquor containing Ge, In and Zn into ferrous ions

The invention relates to the technical field of wet metallurgy, in particular to a method for reducing ferric ions in pickle liquor containing Ge, In and Zn into ferrous ions. The method comprises the steps that firstly, stirring treatment is conducted for 40-60 minutes in the environment with the temperature ranging from 60 DEG C to 70 DEG C through ZnSO3; secondly, scrap iron is added, and a stirring reaction is conducted continuously for at least 30 minutes, so that the content of the ferric ions in an extraction pre-solution is reduced to the level below 200 mg/L. By means of the method, the problems that the cost is high by purely adopting zinc to reduce the ferric ions, the slag discharge amount is large and the cost is high by purely adopting the scrap iron to reduce the ferric ions and crystals produced by ferrous sulfate blocks a pipeline are solved, and the difficulty of consequent reactions is reduced; moreover, the defect that the difficulty of subsequently electrolyzing zinc is large when ferrous sulfate is adopted to reduce the ferric ions in the prior art is overcome; the germanium and indium content in the extraction pre-solution is prevented from being reduced; the extraction recovery rate of germanium and indium is guaranteed, and the additional value is increased.