Method for directly leaching zinc and recovering gallium, germanium and indium from zinc sulfide concentrate

A zinc sulfide concentrate and leaching technology, applied in the field of hydrometallurgy, can solve the problems of large amount of leaching slag and difficult separation, and achieve the effect of less leaching slag

Inactive Publication Date: 2012-08-01
CINF ENG CO LTD +1
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Problems solved by technology

[0015] Using high temperature and high pressure direct leaching process, the resulting supernatant contains mostly Fe 3+ , the leached iron is difficult to separate from gallium, germanium, and indium, and only the main

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  • Method for directly leaching zinc and recovering gallium, germanium and indium from zinc sulfide concentrate
  • Method for directly leaching zinc and recovering gallium, germanium and indium from zinc sulfide concentrate

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Embodiment Construction

[0031] From figure 1 Can find out that technological process of the present invention, its concrete implementation steps are:

[0032] (1) After the zinc concentrate is ground, the particle size is about 25-40 μm. It will be pumped into the first-stage reactor, and oxygen with a concentration of more than 98% will be introduced. It will be leached with low-temperature, low-pressure and low-acid, and the temperature will be within the range of 105-120°C. The pressure is in the range of 200-350kPa, and the acidity is in the range of 10-20g / l. The temperature used in this embodiment is 110° C., the pressure is 300 kPa, and the acidity is 15 g / l. In this way, the sulfur in the zinc sulfide is oxidized to elemental sulfur, and the zinc becomes soluble zinc sulfate. After the leached pulp is cooled and pressure-reduced in the flash tank, it is sent to a thickener for separation, and the supernatant of the first stage is leached into the zinc sulfate solution.

[0033] (2) Pump th...

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Abstract

The invention discloses a method for directly leaching zinc and recovering gallium, germanium and indium from zinc sulfide concentrate. The method comprises the following steps of: grinding the zinc sulfide concentrate, directly leaching the zinc sulfide concentrate at a low temperature under a low pressure by adopting low acid, leaching the leached slag at a high temperature under a high pressure by adopting high acid, neutralizing and displacing the leachate, conveying the filter residue to a gallium, germanium and indium recovery system, removing iron from the filtrate, purifying, performing electro-deposition, and smelting to produce zinc ingots. By the method, the zinc can be directly leached from the zinc sulfide concentrate, and dissipated metals such as gallium, germanium and indium are comprehensively recovered when the zinc is recovered.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for directly leaching zinc from zinc sulfide concentrate and recovering gallium, germanium and indium. Background technique [0002] At present, the process of recovering gallium, germanium, and indium from zinc leaching slag has been studied and applied at home and abroad. In summary, there are mainly the following methods. [0003] 1. Chlorination volatilization method [0004] The chlorination and volatilization method is to add chlorination agent to the zinc leaching slag and roast, gallium, germanium, and indium are chlorinated and volatilized at high temperature in the form of chlorides for recovery, reduction sulfidation smelting, and direct magnetic separation separation and enrichment processes. The biggest problem existing in this method It is the corrosion of chlorides to equipment and the pollution to the environment, and the technical indicators ar...

Claims

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Application Information

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IPC IPC(8): C22B3/04C22B19/00C22B41/00C22B58/00
CPCY02P10/20
Inventor 何醒民潘晨湘余刚李夏湘左小红邓孟俐蔡江松徐毅刘野平张登凯林裕安王李娟
Owner CINF ENG CO LTD
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