Method for extracting indium from alkali oxidation scum rich in indium

A technology of indium-rich alkali and scum, which is applied in the direction of improving process efficiency, can solve the problems of low indium efficiency, and achieve the effects of fast leaching speed, short process flow and high leaching rate

Inactive Publication Date: 2010-09-15
HULUDAO ZINC IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the problem of low efficiency of indium leaching by secondary countercurrent sulfuric acid, the present invention proposes a method for extracting indium from indium-rich alkali oxidation scum

Method used

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  • Method for extracting indium from alkali oxidation scum rich in indium

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Experimental program
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Embodiment 1

[0027] Get 500 grams of indium-rich alkali oxidation scum, the mass percent of its composition is: In4.86%, Zn 5.33%, Pb 60.21%, Cu 0.12%, Bi 0.59%, Sb 0.57%, Fe0.20%, Sn 0.12%, the balance is alkalized. The mass ratio of water washing residue and solvent during leaching is 1:5. The concentration of sulfuric acid in the solvent is 6mol / L, and the concentration of chloride (ion) is 0.5mol / L. The leaching temperature is 60-70°C, and the leaching time is 5 hours. Separation by filtration, washing, drying and weighing. It is measured that the mass percentage of indium in the leaching slag is 0.018%, and the leaching rate of indium in the leaching process is 99.70%.

Embodiment 2

[0029] Get 500 grams of indium-rich alkali oxidation scum, the mass percent of its composition is: In5.19%, Zn 2.76%, Pb 62.28%, Cu 0.10%, Bi 0.50%, Sb 0.26%, Fe0.18%, Sn 0.08%, the balance is alkalized. During leaching, the mass ratio of washing residue and solvent is 1:5, the concentration of sulfuric acid in the solvent is 4mol / L, and the concentration of chloride is 1.5mol / L. The leaching temperature is 70-80°C, and the leaching time is 5 hours. Separation by filtration, washing, drying and weighing. It is measured that the mass percentage of indium in the leaching slag is 0.02%, and the leaching rate of indium in the leaching process is 99.69%.

Embodiment 3

[0031] Get 500 grams of indium-rich alkali oxidation scum, the mass percent of its composition is: In8.53%, Zn 1.20%, Pb 58.26%, Cu 0.11%, Bi 0.60%, Sb 0.65%, Fe0.22%, Sn 0.08%, the balance is alkalized. During leaching, the mass ratio of washing residue and solvent is 1:5, the concentration of sulfuric acid in the solvent is 3mol / L, and the concentration of chloride is 2mol / L. The leaching temperature is 80-90°C, and the leaching time is 5 hours. Separation by filtration, washing, drying and weighing. It is measured that the mass percentage of indium in the leaching slag is 0.03%, and the leaching rate of indium in the leaching process is 99.71%.

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Abstract

The invention relates to a method for extracting indium from alkali oxidation scum rich in the indium. Crude indium is obtained through the following working procedures of: (1) washing the alkali oxidation scum rich in the indium by using water; (2) washing by using water and leaching; (3) washing leached scum by using water; (4) displacing aluminum in leaching liquor; (5) briquetting indium sponges; (6) smelting briquetted alkali; and (7) removing cadmium and thallium in the smelting material. In the method, a solvent consisting of sulfuric acid and chlorides is used for leaching the alkali oxidation scum rich in the indium at a time, and the leaching rate of the indium can reach higher than 99.5 percent. Compared with traditional secondary dilute sulfuric acid counter current leaching, the method has the advantages of short process flow, high leaching speed, low reaction temperature, simple operation, low content of leaching liquid impurities, high indium leaching rate, and the like and is suitable to being applied to extracting metal indium from crude lead alkali oxidation scum rich in the indium.

Description

technical field [0001] The invention relates to a comprehensive recycling technology for non-ferrous metal smelting, in particular to a method for extracting indium from indium-rich alkali oxidation scum. technical background [0002] In the process of crude zinc distillation, high boiling point metals such as lead and indium are enriched in the melting furnace of the rectifying lead column, and after melting and separation, crude lead containing indium is obtained. At present, the recovery of valuable metals such as indium from indium-rich crude lead usually involves adding an oxidant to the molten crude lead for oxidation and slagging. Since indium and most impurity metal elements have a greater affinity for oxygen than lead, these metal elements preferentially react with oxygen to generate slagging, thereby achieving the purpose of effectively enriching indium and refining lead. The oxidant usually used is compressed air. Since air is used as the oxidant, the reaction te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B58/00C22B3/08C22B3/46
CPCY02P10/20
Inventor 刘庆杰郭天立贾乙东武江曹秀红周洪杰
Owner HULUDAO ZINC IND CO LTD
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