Method for reducing arsenic in amine extracted germanium organic phase

An organic phase and extraction technology, applied in the direction of improving process efficiency, etc., can solve the problems that arsenic cannot be removed and reduce the arsenic content of germanium concentrate

Active Publication Date: 2010-01-06
YUNNAN WUXIN IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the arsenic content of germanium concentrate, raw materials with low arsenic content can be selected as much as possible or the raw materials containing arsenic can be pretreated by alkali washing and other methods, but a considerable part of arsenic still exists in the raw materials and cannot be removed. A difficult problem in industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: Sulfuric acid leaching solution contains germanium 75.2mg / l, arsenic 1.19g / l, adds Na by 4g / l 2 SO 3 , and adjust the final acid pH of leaching to be 1.2, after desiliconization and filtration, add the organic complexing agent of germanium for tartaric acid / germanium=11 by weight, extract germanium with N235 kerosene system, the gained germanium-containing organic phase concentration by weight volume percentage is Washing once with 2% oxalic acid solution, followed by alkali stripping and hydrolysis to prepare germanium concentrate, the germanium concentrate contains 0.5% arsenic. According to the conventional process, the obtained germanium concentrate contains 1.7% arsenic.

Embodiment 2

[0025] Embodiment 2: sulfuric acid leaching solution contains germanium 75.2mg / l, arsenic 1.19g / l, adds Na by 1g / l 2 SO 3 , and adjust the leaching final acid pH to be 0.7, after desiliconization and filtration, add the organic complexing agent of germanium for tartaric acid / germanium=8 by weight, extract germanium with N235 kerosene system, the gained germanium-containing organic phase has a weight volume percentage concentration of Wash twice with 1% oxalic acid solution, and then carry out alkali stripping and hydrolysis to prepare germanium concentrate, which contains 0.25% arsenic.

Embodiment 3

[0026] Embodiment 3: sulfuric acid leaching solution contains germanium 75.2mg / l, arsenic 1.19g / l, adds zinc powder by 5g / l, and adjusts to leach final acid PH to be 1.5, after desiliconization filter, by weight ratio is citric acid / germanium= 10 Add an organic complexing agent for germanium, extract germanium with N235 kerosene system, wash the obtained germanium-containing organic phase with oxalic acid solution with a concentration of 1.5% by weight and volume percentage for three times, and then carry out alkali stripping and hydrolysis to prepare germanium concentrate, germanium concentrate The ore contains 0.15% arsenic.

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PUM

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Abstract

The invention relates to a method for reducing arsenic in amine extracted germanium organic phase, which belongs to the technical field of non-ferrous metallurgy. Material containing germanium and arsenic is leached by sulfuric acid, arsenic reducing agent capable of reducing As5<+> into As3<+> is added into leaching solution according to 1-5g/l, and final acid PH is adjusted to 0.5-1.5; after desilication and filtration, germanium organic complexing agent is added into the solution according to the weight ratio of 8-12 of germanium organic complexing agent to germanium to increase the selective extraction of germanium; and germanium is extracted by a N235 kerosene system, obtained germanium organic phase is washed by oxalic acid solution with the weight percentage of 1-2 percent, and then alkalistripping and hydrolysis are carried out to prepare germanium concentrate. The Na2SO3 is preferably adopted as arsenic reducing agent, and tartaric acid is preferably adopted as the organic complexing agent. The method has the advantages that even the solution has high arsenic concentration, the arsenic content of the produced germanium concentrate can be reduced to below 1 percent to meet the requirements of deep processing of germanium.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy. Background technique [0002] When using a tertiary amine (N235) kerosene system to extract germanium from a sulfuric acid solution containing germanium and arsenic, a considerable amount of arsenic will be extracted at the same time, and the arsenic will be hydrolyzed into the germanium concentrate when the germanium is hydrolyzed to prepare the germanium concentrate. , which not only reduces the quality of germanium concentrate, but also causes harm to the deep processing of germanium. When the solution contains high arsenic, the germanium concentrate can contain more than 1% arsenic. In order to reduce the arsenic content of germanium concentrate, raw materials with low arsenic content can be selected as much as possible or the raw materials containing arsenic can be pretreated by alkali washing and other methods, but a considerable part of arsenic still exists in the raw materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/28C22B41/00
CPCY02P10/20
Inventor 李世平张本聪余树华
Owner YUNNAN WUXIN IND
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