Method for recovering indium and germanium from zinc leaching residue

A technology of zinc leaching slag and germanium precipitation, applied in the direction of improving process efficiency, etc., can solve the problems of unrecyclable tailings, complicated operation process, high cost, etc., and achieve the effects of stable indicators, short process flow and low cost

Inactive Publication Date: 2012-10-03
GUANGXI JINSHAN INDIUM & GERMANIUM METALLURGICAL CHEM
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Problems solved by technology

[0011] The deficiencies in the above-mentioned documents are that some of them use substances that are easy to pollute the environment, some need to be carried out under high temperature and high pressu

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  • Method for recovering indium and germanium from zinc leaching residue

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Embodiment 1

[0061] Use 100 tons of zinc leaching slag from Nandan County, Guangxi, which (containing 0.4% indium and 0.08% germanium) is first added to leaching with 80% concentrated sulfuric acid for 2-3 hours, and the leaching slag is recovered by flotation beneficiation. Lead and silver , the solution is then adjusted according to 0.5~0.6 times w(Fe 3+ ), add iron powder, stir and heat to 55-60°C, react for 1-2h, remove ferric iron, then add 50mg / l industrial gelatin to flocculate and remove silicon, react for 30min, after removing silicon, press water / organic Phase = 4:1 Add hydroxamic acid + P204 kerosene organic phase, synergistically extract indium and germanium at room temperature, and return the raffinate to the electrolytic zinc production system to extract the organic phase for use; the organic phase is based on kerosene: P204 = 8:2, Hydroxamic acid: where P204+kerosene=1-1.25%, extract 99% of indium and germanium, and then add 1mol / l ammonium fluoride to the extracted organic ...

Embodiment 2

[0063] Use 100 tons of zinc leaching slag from Gejiu County, Yunnan Province (containing 0.5% indium and 0.3% germanium) for leaching with 80% concentrated sulfuric acid for 2-3 hours, and use flotation beneficiation to recover lead and silver from the leaching slag. The solution is then adjusted according to 0.5~0.6 times w(Fe 3+ ), add iron powder, stir and heat to 55-60°C, react for 1-2h, remove ferric iron, then add 50mg / l industrial gelatin to flocculate and remove silicon, react for 30min, after removing silicon, press water / organic Phase = 4:1 Add hydroxamic acid + P204 kerosene organic phase, synergistically extract indium and germanium at room temperature, and return the raffinate to the electrolytic zinc production system to extract the organic phase for use; the organic phase is based on kerosene: P204 = 8:2, Hydroxamic acid: where P204+kerosene=1-1.25%; extract 90% of indium and germanium, and then add 1mol / l ammonium fluoride to the extracted organic phase accordi...

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Abstract

The invention discloses a method for recovering indium and germanium from a zinc leaching residue. The method comprises the following steps of: leaching the zinc leaching residue containing the indium and the germanium by using a sulfuric acid, eliminating ferric iron and removing silicon, and then, adding a hydroximic acid and P204 kerosene to synergistically extract the indium and the germanium, extracting 99% of the germanium and the indium, and then carrying out back extraction on the germanium through an ammonium fluoride and precipitating the germanium by ammonia gas or ammonia water, carrying out the back extraction on the indium through concentration and a hydrochloric acid, replacing the indium with aluminum, and roasting a germanium precipitation residue to respectively obtain an indium ingot and a germanium concentrate. By using the method, the germanium and the indium can be extracted from slag with a lower grade; a procedure is simple; the operation is easy; and fewer pollutants are discharged.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a method for recovering rare metal indium and germanium from zinc leaching slag produced by wet method. Background technique [0002] Indium, element symbol: In, the distribution of indium in the earth's crust is relatively small and scattered. Its rich ore has not been found, but it exists as an impurity in zinc and some other metal ores, so it is listed as a rare metal. Indium ingots are mainly used in the production of ITO targets (for the production of liquid crystal displays and flat panel screens) due to their strong light permeability and electrical conductivity. This use is the main consumption area of ​​indium ingots, accounting for 70% of the global indium consumption. China is the main producer of indium, so China is the main supplier of indium and germanium in the world. Indium is mainly associated with lead-zinc mines. In China, it is main...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/08C22B3/30C22B41/00C22B58/00
CPCY02P10/20
Inventor 高军段志勇王振峰邓金卓刘运生戴伟明吴军莫文俊杨永明
Owner GUANGXI JINSHAN INDIUM & GERMANIUM METALLURGICAL CHEM
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