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Diluted liquid leaching method for wet type indium smelting

A technology of immersion and wet method, applied in the field of dilute immersion solution for wet indium smelting, which can solve the problems of excessive waste water and increased volume

Active Publication Date: 2018-11-16
刘罗平 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding water in the dilute immersion step will increase the volume of the overall reaction, resulting in more and more waste water in the end.

Method used

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Effect test

Embodiment 1

[0011] The improvement of the present invention for the wet method of indium smelting is as follows:

[0012] One, two cycle leaching:

[0013] First use 98% concentrated sulfuric acid to carry out high-acid leaching on the secondary raw material (this raw material is the slag material after pressure filtration after dilute acid leaching). The general amount of acid used is 200-300 kg per ton of dry material, and the reaction time is 4 hours. About hours, after the reaction, the frame filter press is used for liquid-solid separation, the solution (called high immersion solution) is used for dilute immersion, and the solid residue (being sulfate) becomes available sulfate after rinsing with the raffinate. It is generally lead sulfate, which is sent to crude lead factories as raw materials for refining crude lead. The high immersion liquid is transported to the dilute leaching reaction kettle to react with the raw materials. The reaction between raw materials and sulfuric acid ...

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Abstract

The invention discloses a diluted liquid leaching method for wet type indium smelting. The diluted liquid leaching method comprises the following steps of step 1, adding magnesium oxide into a dilutedsulfuric acid leaching liquid, adjusting the pH (potential of hydrogen) value of the diluted sulfuric acid leaching liquid to 0.8 to 1.5, and leaching out the impurity components in the diluted sulfuric acid leaching liquid, so as to obtain the settled impurities and the purified diluted sulfuric acid leaching liquid; step 2, separating the settled impurities and the purified diluted sulfuric acid leaching liquid by a filter press method. The diluted liquid leaching method has the advantages that the pH value of the solution in the diluted liquid leaching step is increased by the magnesium oxide, the volume of the reaction system is not increased, the drainage amount of sewage is greatly reduced, and a foundation is provided for the sealed type indium smelting method without adding of reaction system and drainage of sewage.

Description

technical field [0001] The invention belongs to the field of metal smelting, in particular to a dilute immersion solution method for wet smelting indium. Background technique [0002] Metal indium is a rare metal, which is widely used in aerospace, radio and electronic industries, medical treatment, national defense, high-tech, energy and other fields. The distribution of indium in the earth's crust is relatively small and scattered. Its rich ore has not been found, but it exists as an impurity in zinc and some other metal ores, so it is listed as a rare metal. The content of indium in the mineral is between 0.0001% and 0.1%. The estimated global indium reserves are only 5 tons. At present, indium is usually smelted by wet method, that is, leaching indium by dilute sulfuric acid, and then performing a dilute immersion step, that is, adding water to increase the pH to about 1, so that tin, bismuth, antimony and other metals in it are precipitated, and then the solution is e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B3/44C22B58/00
CPCC22B3/08C22B3/44C22B58/00Y02P10/20
Inventor 刘罗平李楷
Owner 刘罗平
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