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Process for comprehensively and efficiently recycling zinc and indium in indium raffinate

An indium raffinate and raffinate technology are applied in the field of raffinate recycling, can solve the problems of affecting the electrolytic zinc process, cannot be decomposed and destroyed by heavy metals, and have high processing costs, achieve significant environmental protection effects, and achieve environmental protection effects. Achieve emission-free results

Inactive Publication Date: 2009-04-22
CHENZHOU FENGYUE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these treatment methods cannot decompose and destroy the heavy metals in them, but can only transfer their existing positions and their physical and chemical forms
At present, the raffinate of small and medium-sized indium smelters uses the neutralization method to precipitate metals, and the water is discharged after the treatment reaches the standard, and the treatment cost is high
[0006] There has never been a practice of recycling the raffinate from indium recovery to electrolyze zinc, because the large amount of impurities contained in the raffinate will seriously affect the process of electrolyzing zinc

Method used

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  • Process for comprehensively and efficiently recycling zinc and indium in indium raffinate
  • Process for comprehensively and efficiently recycling zinc and indium in indium raffinate
  • Process for comprehensively and efficiently recycling zinc and indium in indium raffinate

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Raw material: secondary zinc oxide, the ingredients are as shown in Table 1

[0049] Indium raffinate, the composition is as follows Table 2

[0050] Electric zinc production process

[0051] 1. Neutralization and leaching

[0052] at 50m 3 In the mechanically stirred reaction tank, add sulfuric acid, remove the raffinate of the organic phase and the electrolytic waste liquid of electrolytic zinc when recovering indium, ensure the initial acid 150g / L, the liquid-solid mass ratio is 6:1, slowly add 8t of sub-zinc oxide, Raise the temperature to 60°C, react for 1.5 hours, and when the measured pH value reaches 4.5, press filter, and the press filter residue is subjected to acid leaching to extract indium, and the filtrate is sent to the iron precipitation process.

[0053] Table 1

[0054]

[0055] The results show that there is a small amount of indium in the solution, and most of the indium enters the slag.

[0056] 2. Alum sinking process

[0057] Inject the i...

Embodiment 2

[0088] 1. Neutralization and leaching

[0089] at 50m 3 Add sulfuric acid to the mechanically stirred reaction tank, add sulfuric acid, remove the raffinate of the organic phase, start acid 170g / L, slowly add zinc oxide 9t, liquid-solid volume ratio: 6:1, raise the temperature to 65°C, measure the pH value after 2 hours of reaction When it reaches 4.0, press filter, the press filter residue is acid leached to extract indium, and the filtrate is sent to the iron precipitation process.

[0090] 2. Alum sinking process

[0091] Pour the neutralizing solution into 50m 3 A mechanically stirred reaction tank with a volume of 45m 3 . Use the electrolytic waste solution to adjust the pH to 2.0, (stir evenly, take a sample for testing), raise the temperature to about 60°C, add manganese powder according to the iron test result, the liquid-solid volume ratio: 5:1, and raise the temperature to 90°C. Reaction 3h. When Fe≤0.02g / L is tested, add lime milk, adjust the pH value to 5.4, ...

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Abstract

The invention provides a process for comprehensively and efficiently recovering zinc and indium in indium raffinate. The process adopts an iron-indium technique, adds the procedures of precipitating alum and removing iron, removes impurities, and determines a principle of returning raffinate to an electrolytic zinc system in a process of producing electrolytic zinc through wet smelting and comprehensively recovering indium. The process recycles a large amount of sulphuric acid and zinc metal in the raffinate without affecting the running of the electrolytic zinc system, and saves cost without polluting environment at the same time.

Description

[0001] Field [0002] The invention belongs to the field of hydrometallurgy and relates to comprehensive and efficient recovery of precious metals such as zinc and indium in indium raffinate by adopting a new process, and the key point is the recycling of raffinate. Background technique [0003] At present, there are the following problems in the comprehensive recovery and utilization of the raffinate produced by hydrometallurgy of indium. [0004] The process of recovering zinc and indium from secondary zinc oxide is basically two separate processes. The recovery rate of zinc in the process of recovering zinc is only 80%; the recovery rate of indium in the process of recovering indium is only 85%. During the extraction of indium, the raffinate is directly discharged because it contains a large amount of organic phase and metal impurities and cannot be recycled, and a large amount of sulfuric acid, zinc metal and part of indium contained in it are also wasted, which also pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/00C25C1/16C22B58/00C22B3/06
CPCY02P10/20
Inventor 曹亮发尹健夫曾林灿欧阳勇彭志平
Owner CHENZHOU FENGYUE ENVIRONMENTAL PROTECTION TECH
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