Technological method for extracting indium from zinc oxide generated from waste residue from zinc by hydro-smelting

A technology of wet smelting and process method, applied in the field of extracting indium, can solve the problems of high concentration of back-extracting agent, large loss of extracting agent, weak regeneration ability, etc. Effect

Active Publication Date: 2009-12-09
青海西部铟业有限责任公司
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  • Application Information

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Problems solved by technology

[0008] Domestically, P204 is used as the main extraction agent for extracting indium, but this extraction agent has disadvantages such as extraction emulsification, high concentration of stripping agent, large loss of extraction agent, low extraction rate, etc., and its regeneration ability is not strong

Method used

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  • Technological method for extracting indium from zinc oxide generated from waste residue from zinc by hydro-smelting
  • Technological method for extracting indium from zinc oxide generated from waste residue from zinc by hydro-smelting
  • Technological method for extracting indium from zinc oxide generated from waste residue from zinc by hydro-smelting

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Embodiment 1

[0027] The main chemical composition of the indium extraction material (zinc oxide produced from zinc hydrometallurgy waste slag): Zn: ≥ 35%; In: ~0.05%.

[0028] Zinc oxide acid leaching process

[0029] Sulfuric acid is used in the acid leaching process, and the main reactions are as follows:

[0030] ZnO+H 2 SO 4 =ZnSO 4 +H 2 o

[0031] In 2 o 3 +3H 2 SO 4 = In 2 (SO 4 ) 3 +3H 2 o

[0032] PbO+H 2 SO 4 =PbSO 4 +H 2 o

[0033] At the same time, impurities such as Cu and Fe in the zinc oxide material also partially react with sulfuric acid to form soluble sulfate and enter the solution. Since iron is a trivalent ion, it has a great impact on indium during extraction, while other ions are not extracted. .

[0034] Acidity, temperature, pickling time, etc. have a great influence on the leaching rate. With the increase of acidity, the leaching rate of various components increases.

[0035] by right figure 2 , 3 , 4, and combined with the characteristics of ...

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Abstract

The invention relates to the technical field of smelting indium, in particular to relates to a technological method for extracting indium from zinc oxide generated from waste residue from zinc by hydro-smelting. In the process of acidization, the zinc oxide of the invention is acidated by sulphuric acid; after the acid leaching of the zinc oxide, oxyful is used for the deep removal of iron by oxidation in the process of impurity removal of liquid; after the acidization of the zinc oxide, sulphuric acid is used for acidization leaching in a secondary leaching process; the multistage centrifugal extraction which is rich in indium liquid after impurity removal adopts the mixture of Cyanex923 and P204 as a composite extractant; and the back extraction adopts the mixed liquid of 3 mol/L HCL and 2 mol/L ZnC as a back-extractant. The technological method for extracting the indium from the zinc oxide generated from the waste residue from zinc by hydro-smelting has the advantages that the indium smelting production technology parameter and equipment adapt to high altitude and low air pressure environment, the technology is simple, and the operability is high; and the application of the method and the composite extractant of the invention can increase the recovery rate of indium by 10 to 15 percent.

Description

technical field [0001] The invention relates to the technical field of indium smelting, in particular to a process for extracting indium from zinc oxide produced from zinc hydrometallurgy waste slag. Background technique [0002] Zinc hydrometallurgy waste slag is a kind of waste slag with complex composition and many valence elements, which is difficult to handle and comprehensively utilize. Domestic comprehensive recovery methods include flocculant flotation, evaporation by collecting oxide dust and wet leaching to recover gallium, germanium, indium, etc.; abroad, hot acid leaching and extraction recovery are mostly used. [0003] The flotation method realizes the separation of substances based on the mechanism that the surface of mineral particles has hydrophobicity or the hydrophobicity is generated or enhanced by the action of flotation reagents. [0004] The port of Marghera in France is the first factory in the world to realize the extraction of gallium, indium and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/08C22B3/38C22B58/00
CPCY02P10/20
Inventor 宋裕华
Owner 青海西部铟业有限责任公司
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