Method for extracting germanium from zinc smelting replacement slag

A zinc smelting and germanic acid technology, applied in the field of wet recovery of valuable metals, can solve the problems of low germanium leaching rate and recovery rate, long process, etc., and achieve the effect of improving acid leaching capacity, short process and low production cost

Inactive Publication Date: 2017-06-13
六盘水中联工贸实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problems of long flow process, low germanium leaching rate and low recovery rate in the existing technology o...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] First prepare 105g / L H2SO4 solution and HF solution of 50 g / L as leaching agent, prepare 20 g / L hydrogen peroxide solution as oxidizing agent, weigh 500g particle size to be -60 mesh containing germanium 0.36wt%, zinc 22.45wt%, Zinc smelting replacement slag containing 4.18wt% copper, 9.82wt% iron, and 9.30% silicon is placed in a high-pressure reactor, and the leaching agent is added according to the ratio of liquid to solid mass ratio of 4:1. 5% by weight of oxidant is added, the temperature is controlled at 120°C, the pressure is 1MPa, and the material is discharged after reacting for 2 hours to obtain a mixed material;

[0035] The above mixed material is 1.2 times of the silicon content in the zinc smelting replacement slag, and potassium sulfate is added as a filter aid to remove silicon. After stirring and reacting for 1 hour, the germanium-containing acid leaching solution can be obtained by solid-liquid separation. The leaching rate of germanium is 95.60%.

[...

Embodiment 2

[0038] First prepare 55g / L H2SO4 solution and 20g / L HF solution as leaching agent, prepare 50 g / L hydrogen peroxide solution as oxidant, weigh 500g particle size of -60 mesh containing germanium 0.23wt%, zinc 20.75wt%, containing Zinc smelting replacement slag containing 5.26wt% copper, 9.32wt% iron, and 9.52% silicon is placed in a high-pressure reactor, and the leaching agent is added according to the ratio of liquid to solid mass ratio of 8:1. 10% of the oxidizing agent was added, the temperature was controlled at 140 ° C, the pressure was 0.8 MPa, and the material was discharged after 3 hours of reaction to obtain a mixed material;

[0039] Add potassium sulfate as a filter aid to remove silicon by adding 0.8 times the silicon content in the zinc smelting replacement slag to the above mixed material, stir and react for 1.5 hours, and then obtain germanium-containing acid dipping solution through solid-liquid separation. The leaching rate of germanium is 95.28%.

[0040] Add...

Embodiment 3

[0042] First prepare 100g / L H2SO4 solution and 60g / L HF solution as leaching agent, prepare 40 g / L hydrogen peroxide solution as oxidizing agent, weigh 500g particle size of -60 mesh containing germanium 0.18wt%, zinc 23.19wt%, containing Zinc smelting replacement slag containing 3.65wt% copper, 9.96wt% iron, and 9.36% silicon is placed in a high-pressure reactor, and the leaching agent is added according to the ratio of liquid to solid mass ratio of 5:1. 8% of the oxidant was added, the temperature was controlled at 160°C, the pressure was 1.2MPa, and the material was discharged after 1 hour of reaction to obtain a mixed material;

[0043] Add potassium sulfate as a filter aid to remove silicon by adding 1.1 times the silicon content in the zinc smelting replacement slag to the above mixed material, stir and react for 1 hour, and then obtain germanium-containing acid leaching solution through solid-liquid separation. The leaching rate of germanium is 95.41%.

[0044] Add iro...

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PUM

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Abstract

The invention discloses a method for extracting germanium from zinc smelting replacement slag. According to the method, germanium-containing leachate is obtained through an oxygen pressure acid leaching process; and after an ion masking agent is added into the leachate, tannin is added to enable germanium to settle, tannin germanium sediment is obtained, the tannin germanium sediment is calcined, and then germanium concentrate is obtained. Compared with a traditional process, the method has the beneficial effects that 1, the oxygen pressure acid leaching process is adopted, mixed acid of sulfuric acid and hydrofluoric acid is used as a leaching agent, the leaching influences of silicone and iron on germanium are eliminated, the acidolysis speed is increased by 2 times or above, the leaching rate of germanium is increased, and the leaching rate of germanium reaches 95% or above; 2, by reducing the content of silicone and iron in the germanium leachate, the extraction influences of silicone and iron on germanium are eliminated, the recovery rate of germanium is increased, the quality of the germanium concentrate is improved, the recovery rate of germanium reaches 95% or above, and the mass fraction of germanium in the germanium concentrate is larger than 20%; and 3, the method is short in flow, low in energy consumption, easy to operate and low in production cost, and facilitates industrial production.

Description

technical field [0001] The invention relates to a wet recovery method of valuable metals, in particular to a method for extracting germanium from zinc smelting replacement slag. Background technique [0002] The bulk industrial solid waste generated when zinc powder is used to replace and remove impurities in the purification section of the hydrometallurgy enterprise is called zinc smelting replacement slag. Discharging it will cause serious environmental pollution and is classified as national hazardous waste. Zinc smelting replacement slag is usually rich in scattered metal germanium, the germanium grade is 0.1-0.5%, and has a very high recovery value. However, because the slag contains a large amount of impurity elements iron and silicon, which have a great influence on the occurrence and existence of germanium, germanium usually exists in the slag in the form of inclusions, which makes the extraction of germanium difficult. This type of slag uses the rotary kiln volatil...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B41/00
CPCC22B7/007C22B41/00Y02P10/20
Inventor 钟波钟思河刘安荣王振杰罗玉德
Owner 六盘水中联工贸实业有限公司
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