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Method for extracting silver from silver-extracted sediment

A technology for separating silver slag and central silver, which is applied in the field of industrial waste treatment, can solve problems such as unsuitability for silver extraction and environmental pollution, and achieves the effects of high silver leaching rate, environmental friendliness and pollution reduction.

Inactive Publication Date: 2011-09-14
GEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the methods for leaching silver mainly include ammonia leaching method and sodium sulfite leaching method, but these two methods are mainly suitable for situations with high silver content, and are not suitable for extracting silver from silver slag with low silver content.
In addition, the ammonia used in the ammonia leaching method may cause pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for extracting silver from silver slag, comprising the following steps:

[0014] (1) Initial leaching: take the silver slag, add water for slurrying according to the solid-liquid mass ratio of 1:6, then add sodium thiosulfate and copper sulfate respectively, stir, and the final concentration of sodium thiosulfate is 120g / L , the final concentration of copper sulfate is 40g / L, leaching at a temperature of 60°C for 2 hours, filtering and separating the solid and liquid, and the initial leaching of the filter residue into step (2), adding sodium dithionite to reduce silver in the initial leaching filtrate, the sodium dithionite The final concentration is 2g / L, and it is reduced at a temperature of 60°C for 2 hours. After reduction, the solution returns to leaching silver;

[0015] (2) Secondary leaching: get the initial leaching filter residue, add water, sodium thiosulfate and copper sulfate respectively, stir, the final concentration of sodium thiosulfate is 120...

Embodiment 2

[0018] A method for extracting silver from silver slag, comprising the following steps:

[0019] (1) Initial leaching: Take the silver slag, add water for slurrying according to the solid-liquid mass ratio of 1:5, then add sodium thiosulfate and copper sulfate respectively, stir, and the final concentration of sodium thiosulfate is 200g / L , the final concentration of copper sulfate is 50g / L, leaching at a temperature of 50°C for 3 hours, filtering and separating the solid and liquid, and the initial leaching of the filter residue into step (2), adding sodium dithionite to reduce silver in the initial leaching filtrate, the sodium dithionite The final concentration is 5g / L, and it is reduced for 3 hours at a temperature of 50°C. After reduction, the solution returns to leaching silver;

[0020] (2) Secondary leaching: get the initial leaching filter residue, add water, sodium thiosulfate and copper sulfate respectively, stir, the final concentration of sodium thiosulfate is 200...

Embodiment 3

[0023] A method for extracting silver from silver slag, comprising the following steps:

[0024] (1) Initial leaching: Take the silver slag, add water for slurrying according to the solid-liquid mass ratio of 1:8, then add sodium thiosulfate and copper sulfate respectively, stir, and the final concentration of sodium thiosulfate is 80g / L , the final concentration of copper sulfate is 20g / L, leaching at a temperature of 70°C for 0.5 hour, filtering to separate the solid and liquid, the initial leaching of the filter residue into step (2), adding sodium dithionite to reduce silver in the initial leaching filtrate, the sodium dithionite The final concentration is 0.2g / L, and it is reduced at a temperature of 70°C for 3 hours, and the solution returns to leaching silver after reduction;

[0025] (2) Secondary leaching: get the initial leaching filter residue, add water, sodium thiosulfate and copper sulfate respectively, stir, the final concentration of sodium thiosulfate is 80g / L...

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PUM

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Abstract

The invention provides a method for extracting silver in silver-extracted sediment. In the method, sodium thiosulfate and copper sulfate which serve as leachate are leached twice to extract the silver, so the method is high in the leaching rate of the silver and environment-friendly; and the silver is reduced by adopting sodium dithionite and the reduced liquid is regenerated to be used for leaching, so the cost is saved greatly.

Description

technical field [0001] The invention relates to the treatment of industrial waste, in particular to a method for extracting silver from silver-separating slag. Background technique [0002] Silver-separating slag is the residual residue after copper anode slime is extracted with precious metals such as silver, gold, platinum and palladium, which still contains a small amount of precious metals such as silver, gold, platinum and palladium, and has certain comprehensive utilization value. Generally, the methods for leaching silver mainly include ammonia leaching and sodium sulfite leaching, but these two methods are mainly suitable for situations with high silver content, and are not suitable for extracting silver from silver slag with low silver content. In addition, the ammonia used in the ammonia leaching method may cause pollution to the environment. [0003] Therefore, it is very important to seek a new method with high silver leaching rate, environmental friendliness an...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 许开华曹卉
Owner GEM CO LTD
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