Method for extracting indium and preparing iron oxide by slag-free zinc hydrometallurgy of zinc concentrate

Abstract

The invention relates to a method for extracting indium and preparing iron oxide by slag-free zinc hydrometallurgy of zinc concentrate, which comprises the following steps of: 1, performing fluidized bed roasting, neutral leaching, low acid leaching, purification and electrodeposition on the zinc concentrate to prepare electric zinc; 2, performing high acid leaching, reduction, preneutralization and displacement to remove copper on low acid leaching residue and waste electrolyte after the electrodeposition to prepare the electric zinc; 3, neutralizing the liquid from which the copper is removed to settle the indium; 4, vulcanizing the liquid in which the indium is settled to remove heavy metal and then adding lime milk to neutralize the liquid to obtain deeply purified liquid; 5, settling iron in the deeply purified liquid by a hydrothermal method to obtain hematite powder; and 6, removing impurities from the hematite powder to obtain soft magnetic iron oxide. In the method, the indium is settled by neutralizing and the iron is settled by the hydrothermal method, so that the indium is separated from the iron, the indium is separated from the zinc, the hematite powder is formed, and the requirement of the soft magnetic iron oxide is met through impurity removal treatment. The method has the advantages of simple process, high recovery rate of the indium and the zinc, short flow for separating the iron from the zinc, high purity of the iron, environmental friendliness, suitability for industrial application, and capability of replacing the conventional slag-free zinc hydrometallurgy process for extracting the indium and making effective use of the iron resource in the zinc concentrate in a form of the soft magnetic iron oxide.

Description

technical field [0001] The invention discloses a method for extracting indium and producing iron oxide through wet smelting of zinc ore without iron slag, and relates to the fields of hydrometallurgy and material preparation. Background technique [0002] In the process of extracting indium from traditional zinc hydro-smelting, the iron is opened with the slag, and the indium also enters the slag. In order to recover indium, the slag must be treated by pyrolysis to volatilize indium and zinc, but produce a large amount of low-concentration sulfur dioxide and high-speed iron kiln slag pollute the environment. The direct stacking of low-indium jarosite slag causes long-term pollution of heavy metals, and the disposal of the jarosite slag has become a worldwide problem. [0003] Although some foreign factories use hematite iron precipitation method to separate zinc-iron and regenerate sulfuric acid, the hematite slag produced is very impure and can only be disposed of as waste...

AI Technical Summary

Problems solved by technology

No. ZL03118199.6 invention patent makes zinc concentrate iron resources into manganese-zinc soft magnetic ferrite material, so as to achieve zinc extraction by wet smelting without iron slag, which not only avoids iron slag and sulfur dioxide pollution, but also greatly improves indium and zinc Recovery rate; but this patent encounters the following problems in the practice process: (1) When the extraction method is used to recover indium, the amount of extractant used is large, and the extracted solution is not as good as it seems. 2) The iron-zinc separation process is long, and the sulfate radical combined with iron cannot regenerate sulfuric acid, but can only be produced in the form of ammonium sulfate

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