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A cascade leaching process of germanium-rich zinc oxide fumes

A technology of zinc oxide and soot, which is applied to germanium and the process of synchronously controlling the valence state of iron in the solution, in the field of efficient zinc leaching by zinc oxide soot, can solve the problems of difficult control of ferric iron concentration and high equipment requirements, and reduce the amount of leaching slag, The effect of high leaching rate and simple operation

Active Publication Date: 2020-10-09
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Oxygen pressure leaching can greatly increase the leaching rate of zinc and germanium, but compared with the normal pressure leaching process, the required equipment is more demanding, and the concentration of ferric iron in the leach solution is not easy to control, and the impact of high concentration of ferric iron on the subsequent recovery of germanium from the leach solution Larger, need to add a special reduction process to ensure that the iron in the leachate is divalent iron

Method used

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  • A cascade leaching process of germanium-rich zinc oxide fumes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The main components of germanium-rich zinc oxide dust provided by a certain factory are as follows: Zn: 45.33wt%, Fe: 3.22wt%, S: 2.05wt%, Pb13.89wt%, Ge: 1972g / t, zinc hydrometallurgy The main components of the electrolytic waste solution are as follows: H 2 SO 4 : 155g / L, Zn: 46g / L;

[0030] ① Mix 1.67kg of germanium-rich zinc oxide dust with 3g of sodium lignosulfonate, add 3L of water, and perform mechanical activation through a wet ball mill to obtain a finely ground pulp with a dust particle size of less than 0.074mm;

[0031] ②According to the ratio of adding 11L of wet zinc electrolysis waste liquid to 1 kg of finely ground pulp on a dry basis, mix the finely ground pulp with the wet zinc electrolysis waste liquid, control the terminal acidity to 100g / L, and conduct a first-level high Acid leaching, after 1.5 hours of reaction, the high-acid leaching pulp overflows to the 1# oxidation leaching tank;

[0032]③According to the mixing ratio of 0.80kg of finely g...

Embodiment 2

[0037] The main components of germanium-rich zinc oxide dust provided by a certain factory are as follows: Zn: 47.26wt%, Fe: 5.03wt%, S: 7.98wt%, Pb12.57wt%, Ge: 506g / t, zinc hydrometallurgy The main components of the electrolytic waste solution are as follows: H 2 SO 4 : 185g / L, Zn: 53g / L;

[0038] ① Mix 1.7 kg of germanium-rich zinc oxide dust with 5 g of calcium lignosulfonate, add 4 L of the lotion in step ⑤ of Example 1 to adjust the pulp, and perform mechanical activation through a wet ball mill to obtain a finely ground pulp with a dust particle size of less than 0.074 mm;

[0039] ②According to the ratio of adding 9L of wet zinc electrolysis waste liquid to 1 kg of finely ground pulp on a dry basis, mix the finely ground pulp with wet zinc electrolysis waste liquid, control the terminal acidity to 90g / L, and conduct a first-level high Acid leaching, after 1 hour of reaction, the high-acid leaching pulp overflows to the 1# oxidation leaching tank;

[0040] ③According...

Embodiment 3

[0045] The main components of germanium-rich zinc oxide dust provided by a certain factory are as follows: Zn: 47.17wt%, Fe: 4.03 wt%, S: 6.45 wt%, Pb11.96 wt%, Ge: 721g / t, zinc hydrometallurgy The main components of the electrolytic waste solution are as follows: H 2 SO 4 : 165g / L, Zn: 49g / L;

[0046] ①Mix 1.6kg of germanium-rich zinc oxide fumes with 1.6g of sodium lignosulfonate, add 3.4L of the lotion in step ⑤ of Example 2 to adjust slurry, and perform mechanical activation through a wet ball mill to obtain finely ground dust with a particle size of less than 0.074mm pulp;

[0047] ②According to the ratio of adding 10L of wet zinc electrolysis waste liquid to 1 kg of finely ground pulp on a dry basis, mix the finely ground pulp with the wet zinc electrolysis waste liquid, control the final acidity to 80g / L, and the reaction temperature to 85°C for a first-level high Acid leaching, after 2 hours of reaction, the high-acid leaching pulp overflows to the 1# oxidation leac...

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Abstract

The invention discloses a gradient leaching process of zinc oxide fume rich in germanium and relates to the process where zinc and germanium are efficiently leached from the zinc oxide fume rich in germanium and the iron valence state in a solution is controlled synchronously. Traditional multi-stage leaching is adjusted into single-stage continuous gradient leaching, the zinc and germanium leaching rates and the iron ion reduction and leach liquor final acidity are controlled step by step gradually, and zinc and germanium efficient leaching and control over ferric iron in leach liquor in thesmelting process are achieved. The process flow is simple, the zinc and germanium leaching rates are high, energy consumption is low, cleanliness and environment friendliness are achieved, and comprehensive recovery and utilization of resources are facilitated.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and relates to a cascade leaching process of germanium-rich zinc oxide fumes, in particular to a process for efficiently leaching zinc and germanium from germanium-rich zinc oxide fumes and synchronously controlling the valence state of iron in the solution. Background technique [0002] As a scattered metal, germanium is widely used in high-tech fields due to its unique physical and chemical properties. There are very few germanium deposits that can be independently mined in nature. At present, the recovery of germanium mainly comes from the zinc smelting industry. In the process of smelting by the traditional method, germanium will be enriched in the zinc leaching slag, which has become an important resource for the recovery of gallium and germanium. The methods for recovering germanium from germanium-containing zinc leaching slag are mainly fire reduction volatilization method and wet ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/02C22B19/30C22B19/20C22B41/00
CPCC22B7/007C22B7/02C22B19/22C22B19/30C22B41/00Y02P10/20
Inventor 邓志敢魏昶朱应旭李兴彬李旻廷樊刚刘慧杨杨源曾涛
Owner KUNMING UNIV OF SCI & TECH
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