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Method for recovering germanium from zinc dross

A zinc slag and hydrogen peroxide technology, applied in the field of germanium recovery, can solve the problems of inability to realize oxidation, inability to release germanium, inability to recover zinc slag, etc., and achieve the effects of low cost, stable recovery rate and high recovery rate

Active Publication Date: 2010-06-30
YUNNAN WUXIN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under alkaline conditions, it is impossible to oxidize lead, indium, gallium, arsenic and other elements by using hydrogen peroxide, so that the germanium wrapped by these main components cannot be released, so the above two patented methods cannot be used to recover germanium in zinc slag

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: In a 1000L reactor, 50-150L of water was added, and 6 parts of 2.4% zinc slag with a grade of 150-200 kg were added to the reactor respectively, and 6 tests were carried out. Start stirring to fully mix the zinc slag, then add 100-200L of 10mol / L industrial hydrochloric acid for the first time, stir evenly to fully react the zinc slag and the material, then slowly add H2O with a mass concentration of 30-50% 2 o 2 60-112.5L, add 350-900L of industrial hydrochloric acid for the second time, and carry out 6 tests under the operating control conditions in Table 1. The obtained germanium recovery data are shown in Table 1.

[0028] Table 1

[0029] Test No.

[0030] Test No.

Embodiment 2

[0031]Embodiment 2: Firstly, in a 1000L reactor, add 50-150L of water, then add 5 parts of 1.01% zinc slag with a grade of 150-200 kg into the reactor respectively, and carry out 5 tests. Start stirring to fully mix the zinc slag, then add 100-200L of 10mol / L industrial hydrochloric acid for the first time, stir evenly to fully react the zinc slag and the material, then slowly add H2O with a mass concentration of 30-50% 2 o 2 60-112.5L, add 350-900L of industrial hydrochloric acid for the second time, and carry out 5 tests under the operating control conditions in Table 2. The germanium recovery data obtained are shown in Table 2.

[0032] Table 2

[0033] Test No.

[0034] Test No.

Embodiment 3

[0035] Embodiment 3: first in the reactor of 1000L, add the water of 50-150L, ​​then be 5 parts of the zinc slag of 1.01% with grade, every part 150-200 kilogram, join in the reactor, start stirring to make the zinc slag fully Mix well, then add 100-200L of 10mol / L industrial hydrochloric acid for the first time, stir evenly to fully react the zinc slag with the material, then slowly add 30-50% H 2 o 2 60-112.5L, add industrial hydrochloric acid 350-900L for the second time, and carry out 5 tests under the operating control conditions in Table 3. The germanium recovery data obtained are shown in Table 3.

[0036] table 3

[0037] Test No.

[0038] Test No.

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PUM

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Abstract

Then invention relates to a method for recovering germanium from zinc dross, belonging to the technical field of non-ferrous metallurgy. After the secondary extracted zinc is leached by adopting the wet method, and the leached dross can be pre-treated, the germanium can be converted into the germanic from the low-valence in metal or germanium monoxide. Namely, hydrogen peroxide is used for oxidizing germanium, lead, indium, arsenic and other elements in the hydrochloric acid medium, so that the elements can be oxidized from low valence to high valence; the lead, indium, arsenic, gallium and the like react into solution, the low-valence germanium wrapped by the elements can be exposed and oxidized to be the germanic by the hydrogen peroxide under the acid condition into hydrochloric acid solution, and the germanic can escape in a form of germanium tetrachloride by evaporation, so as to realize the separation with other purities; and then, the separated germanium tetrachloride is purified and hydrolyzed, so as to prepare germanium dioxide. In the zinc dross with the germanic being more than 2.0%, the recovery rate of the germanic can reach more than 98%; in the zinc dross with the germanic being more than 1.0-2.0%, the recovery rate of the germanic can reach more than 95%; and in the zinc dross with the germanic being 0.1-1.0%, the recovery rate of the germanic can reach more than 90%.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and specifically relates to a method for recovering germanium from zinc slag containing more than 0.1 percent germanium. Background technique [0002] In the process of zinc smelting, after carbon reduction, the valuable elements in zinc ore such as zinc, lead, indium, iron, silver, and arsenic are all reduced to elemental or low-valence compounds; After germanium is reduced by carbon, it remains in the zinc distillation residue in the form of elemental germanium or germanium monoxide. The zinc slag after separating a large amount of zinc by fire distillation generally contains 0.05-5.0% germanium. The method for reclaiming germanium from zinc slag is mainly to crush the zinc slag to 100-200 mesh at present, and then use sulfuric acid to leach and recover zinc, while valuable metals such as germanium, indium, and gallium remain in the leaching slag. The leach residue is then acid-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B41/00C22B3/10
CPCY02P10/20
Inventor 余树华
Owner YUNNAN WUXIN IND
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