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Method for separating, enriching and recycling indium from low-concentration indium sulphate solution

A technology of separation and enrichment and indium sulfate, applied in the direction of improving process efficiency, etc., can solve the problems of unresolved chlorine-containing waste acid discharge, unsuitable for separation and recovery, etc., to reduce adverse effects, eliminate dispersion losses, and reduce production cost effect

Active Publication Date: 2015-11-04
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The paper "Industrial Practice of Recovering Indium from Chlorinated Distillation Raffinate of Germanium Extraction" published in "Nonferrous Metallurgy of China" in 2011 disclosed a method of using TBP-P204 combined extraction process for recovering indium, but this process technology is only suitable for separating and recovering indium from hydrochloric acid solution, not suitable for separating and recovering indium from sulfuric acid solution, and finally adopts 6mol / L hydrochloric acid to back-extract indium, and the back-extraction solution is passed through After the aluminum plate replaces the sinking indium, a large amount of high-concentration chlorine-containing wastewater is produced, which still does not solve the problem of the discharge of chlorine-containing waste acid in the indium recovery process

Method used

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  • Method for separating, enriching and recycling indium from low-concentration indium sulphate solution
  • Method for separating, enriching and recycling indium from low-concentration indium sulphate solution
  • Method for separating, enriching and recycling indium from low-concentration indium sulphate solution

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Embodiment 1

[0029] Such as figure 1As shown, the method for separating, enriching and recovering indium from a low-concentration indium sulfate solution comprises: first extracting the low-concentration indium sulfate solution with P204, and then back-extracting it with hydrochloric acid to obtain an indium chloride back-extraction solution; The obtained indium chloride back-extraction solution is then extracted with TBP, back-extracted with dilute sulfuric acid to obtain a high-concentration indium sulfate solution, and finally the high-concentration indium sulfate solution is replaced by metal to obtain sponge indium.

[0030] The specific steps are:

[0031] (1) P204 extraction: first mix P204 and sulfonated kerosene at a volume ratio of 20:80 to obtain an organic phase, then mix the low-concentration indium sulfate solution and the organic phase at a volume ratio of 2:1 and add them to a box-type mixing and settling tank Three-stage counter-current extraction was carried out in 50°C...

Embodiment 2

[0037] Such as figure 1 As shown, the method for separating, enriching and recovering indium from a low-concentration indium sulfate solution comprises: first extracting the low-concentration indium sulfate solution with P204, and then back-extracting it with hydrochloric acid to obtain an indium chloride back-extraction solution; The obtained indium chloride back-extraction solution is then extracted with TBP, back-extracted with dilute sulfuric acid to obtain a high-concentration indium sulfate solution, and finally the high-concentration indium sulfate solution is replaced by metal to obtain sponge indium.

[0038] The specific steps are:

[0039] (1) P204 extraction: First, mix P204 and sulfonated kerosene at a volume ratio of 30:70 to obtain an organic phase, then mix the low-concentration indium sulfate solution and the organic phase at a volume ratio of 2:1 and add them to a box-type mixing and settling tank Four-stage counter-current extraction was carried out in 45°...

Embodiment 3

[0045] Such as figure 1 As shown, the method for separating, enriching and recovering indium from a low-concentration indium sulfate solution comprises: first extracting the low-concentration indium sulfate solution with P204, and then back-extracting it with hydrochloric acid to obtain an indium chloride back-extraction solution; The obtained indium chloride back-extraction solution is then extracted with TBP, back-extracted with dilute sulfuric acid to obtain a high-concentration indium sulfate solution, and finally the high-concentration indium sulfate solution is replaced by metal to obtain sponge indium.

[0046] The specific steps are:

[0047] (1) P204 extraction: first mix P204 and sulfonated kerosene at a volume ratio of 25:75 to obtain an organic phase, then mix the low-concentration indium sulfate solution and the organic phase at a volume ratio of 2:1 and add them to a box-type mixing and settling tank Three-stage counter-current extraction was carried out in 40°...

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Abstract

The invention relates to a method for separating, enriching and recycling indium from a low-concentration indium sulphate solution, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: firstly performing P204 extraction on the low-concentration indium sulphate solution, and then performing hydrochloric acid back extraction so as to obtain an indium chloride strip solution; performing TBP extraction on the obtained indium chloride strip solution; performing dilute sulphuric acid back extraction so as to obtain a high-concentration indium sulphate solution; and finally performing metal replacement on the high-concentration indium sulphate solution so as to obtain sponge indium. According to the method disclosed by the invention, the indium is obtained through back extraction of sulphuric acid in the end, the high-concentration indium sulphate solution is produced, the hydrochloric acid used in a middle process can be circularly used, so that the consumption of the hydrochloric acid is reduced, large-scale emission of chloride waste water can be avoided, and negative influences of chlorine ions on zinc hydrometallurgy electrodeposition operational procedures are reduced.

Description

technical field [0001] The invention relates to a method for separating, enriching and recovering indium from a low-concentration indium sulfate solution, and belongs to the technical field of hydrometallurgy. Background technique [0002] As a dispersed element, indium rarely forms independent deposits. Indium mainly exists in a dispersed state in nature, and is often associated with sulfide minerals such as zinc, lead, tin, and copper, among which sphalerite is its main source. At present, indium is mainly recovered from the intermediate slag of zinc smelting, copper smelting and tin smelting. The main process of recovering indium from these indium-containing intermediate slags is leaching→extraction→replacement→electrodeposition to produce refined indium. Due to the low content of indium in raw materials, the concentration of indium in the leaching solution obtained by leaching is usually only tens to hundreds of milligrams per liter, and most of the leaching solutions ...

Claims

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Application Information

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IPC IPC(8): C22B58/00C22B3/26C22B3/46
CPCY02P10/20
Inventor 魏昶李兴彬李存兄邓志敢樊刚李旻廷荣浩
Owner KUNMING UNIV OF SCI & TECH
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