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Method for efficiently extracting germanium from zinc-germanium leaching solution

A leaching solution, zinc germanium technology, applied in chemical instruments and methods, improvement of process efficiency, sugar derivatives, etc., can solve the problems of high price of tannic acid, can not be recycled, expensive, etc., to improve the rate of germanium deposition and single The effect of improving the purity of germanium, reducing production costs and improving the rate of germanium deposition

Pending Publication Date: 2021-04-16
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

At present, representative enterprises in my country mainly extract germanium from the leaching solution obtained by acid leaching of by-products of zinc smelting. The main methods include zinc powder replacement method, extraction method, and tannin precipitation method. However, zinc powder replacement and extraction methods have pollution to the environment and the price of extractants. Expensive, not recyclable and other disadvantages, so the tannin precipitation method is widely used now
However, since tannic acid will react with other impurity ions such as iron and arsenic, it not only increases the amount of tannic acid, but also affects the grade of germanium concentrate. more and more important

Method used

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  • Method for efficiently extracting germanium from zinc-germanium leaching solution
  • Method for efficiently extracting germanium from zinc-germanium leaching solution
  • Method for efficiently extracting germanium from zinc-germanium leaching solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: a kind of method (see figure 1 ),Specific steps are as follows:

[0020] (1) Add the purifying agent (catechol) to the zinc-germanium leaching solution, and react for 10 minutes under stirring conditions to precipitate and react impurity ions such as arsenic and iron with catechol to obtain the solution system A, and separate the solid and liquid to obtain the solution B; wherein zinc content is 100g / L in zinc-germanium leach solution, and Ge content is 50mg / L, and Fe content is 5g / L, and Mg content is 60g / L, and As content is 0.5g / L, purifying agent (catechol ) in an amount of 5g / L; the pH value of the solution system A is 1; the Zn content in the solution B is 98.9g / L, the Ge content is 49.5mg / L, the Fe content is 2.1g / L, and the Mg content is 59.3g / L, the As content is 0.2g / L, and the pH value of solution system B is 1;

[0021] (2) Add tannic acid extract (Vitex bark extract) to solution B in step (1), react for 1 minute under stirring conditions, t...

Embodiment 2

[0025] Embodiment 2: a kind of method (see figure 1 ),Specific steps are as follows:

[0026] (1) Add the purifying agent (biochar) into the zinc-germanium leaching solution, and react for 15 minutes under stirring conditions so that the impurity ions such as arsenic and iron are adsorbed and precipitated with the biochar to obtain the solution system A, and the solid-liquid separation obtains the solution B; wherein the zinc Zinc content is 150g / L in germanium leaching solution, and Ge content is 75mg / L, and Fe content is 7.5g / L, and Mg content is 80g / L, and As content is 0.75g / L, and the add-on of purification agent (biochar) is 7.5g / L; pH value of solution system A is 1.5; Zn content in solution B is 149.2g / L, Ge content is 74.5mg / L, Fe content is 3.8g / L, Mg content is 79.3g / L, As The content is 0.28g / L; the pH value of solution system B is 1.5;

[0027] (2) Add tannin extract (almond bark tannin extract) to solution B in step (1), react for 5 minutes under stirring condi...

Embodiment 3

[0031] Embodiment 3: a kind of method (see figure 1 ),Specific steps are as follows:

[0032] (1) Add the purifying agent (D001 resin) to the zinc-germanium leaching solution, and react for 20 minutes under stirring conditions to adsorb and precipitate impurity ions such as arsenic and iron with biochar to obtain solution system A, and separate solid-liquid to obtain solution B; The zinc content in the germanium leaching solution is 200g / L, the Ge content is 100mg / L, the Fe content is 10g / L, the Mg content is 100g / L, the As content is 1g / L, and the addition amount of the purifying agent (D001 resin) is 10.0g / L; the pH value of the solution system A is 3.0; the Zn content in the solution B is 199.3g / L, the Ge content is 99.5mg / L, the Fe content is 3.2g / L, the Mg content is 99.6g / L, and the As content is 0.23g / L; pH value of solution system A is 3.0;

[0033] (2) Add tannin extract (larch tannin extract) to solution B in step (1), react under stirring conditions for 10 minute...

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Abstract

The invention relates to a method for efficiently extracting germanium from a zinc-germanium leaching solution, and belongs to the technical field of hydrometallurgy in nonferrous metallurgy. The method comprises the following steps of adding a purifying agent into the zinc-germanium leaching solution, reacting for 10-20 minutes under a stirring condition so as to obtain a solution system A, and carrying out solid-liquid separation so as to obtain a solution B; and adding a tannin extract into the solution B, reacting for 1-10 minutes under a stirring condition, then slowly adding tannic acid, reacting for 10-20 minutes so as to obtain a system C, carrying out solid-liquid separation so as to obtain germanium-precipitated liquid and tannin germanium slag, and washing the tannin germanium slag so as to obtain tannin germanium. According to the method, the purifying agent is added to react with impurity ions so as to generate insoluble substances, a filtrate with high germanium content and low impurity element content is obtained through filtration, then germanium precipitation is carried out in sequence after the tannin extract and the tannic acid are added, the germanium precipitation rate reaches 98.9%, the germanium content in the tannin germanium reaches 5%, the purity of the tannin germanium is improved, the tannin extract is lower in price and lower in production cost compared with the tannic acid, and an existing germanium precipitation process can be obviously optimized. The method has the characteristics of low labor intensity, high germanium extraction rate and low production cost.

Description

technical field [0001] The invention relates to a method for efficiently extracting germanium from a zinc-germanium leaching solution, belonging to the technical field of hydrometallurgy in nonferrous metallurgy. Background technique [0002] Germanium (Ge) is a rare metal, and its distribution in the earth's crust is extremely scattered. It is mainly associated with bauxite, lead-zinc ore and coal mines. It is the most important semiconductor material other than silicon, and is widely used in optical fibers, solar cells, medical It is also an indispensable important metal in the fields of national defense, aviation and space development, and is an important strategic reserve resource of our country. At present, representative enterprises in my country mainly extract germanium from the leaching solution obtained by acid leaching of by-products of zinc smelting. The main methods include zinc powder replacement method, extraction method, and tannin precipitation method. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B41/00C07H1/00C07H1/06C07H23/00C22B3/44
CPCY02P10/20
Inventor 张利波杨芳芳杨坤狄浩凯梁明
Owner KUNMING UNIV OF SCI & TECH
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