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

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for reducing ferric ions in an acid immersion solution containing Ge, In and Zn into ferrous ions. Background technique [0002] In various hydrometallurgical extraction processes, in order to ensure the normal progress of the extraction process, minimize the poisoning and aging of the extracted organic phase, and prolong the service life of the extraction agent, the requirements for the content of silica in the pre-extraction liquid It should be controlled below 300mg / L, and the content of ferric ions should be controlled below 200mg / L. Especially when P204 and N235 are used as extraction agents, the extraction agents are easily poisoned and aged by iron ions, and most of the acid leaching solutions containing Ge, In, and Zn contain relatively high Fe 3+ , and in order to increase the leaching rate of Ge, In, and Zn, oxidation leaching is often required, so tha...

AI Technical Summary

Problems solved by technology

However, when adopting zinc reduction treatment, due to the high price of zinc powder, the cost of treatment is relatively high, and the chemical activity of zinc is strong, while reducing iron ions, it also replaces the iron ions in the pre-extraction solution. The content of In and Ge in the solution reduces the content of In and Ge in the solution, which is not conducive to the extraction and separation of Ge, In, and Zn; thus, iron filings are generally used to reduce the iron ions in the acid leaching solution containing Ge, In, and Zn. , but the reduction of iron ions by iron filings will inevitably increase the content of ferrous ions in the solution, and then when the ferric ions in the solution are at 10g / L, after the final reduction, the total amount of iron in the solution will reach more than 15g / L. Not only will the crystallization of ferrous sulfate that will be produced, but also block the pipeline, making it difficult to transport and extract the solution; More consumption, more consumption of neutralizing agent, which not only results in higher processing costs, but also makes a large amount of slag discharge, which in turn makes it difficult to recover a large amount of zinc

[0004] Based on this, some researchers use sodium sulfite to reduce ferric ions, and then solve the defects of using iron filings to reduce iron ions in the prior art, and this replacement has also achieved certain success, but this method brings a lot of Sodium ions, and sodium ions are not easy to remove in the process of electrolytic zinc, so that after the sodium ions are enriched to a certain extent, the normal progress of the electrolytic zinc process is affected, resulting in high energy consumption for electrolytic zinc