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Method for comprehensively recovering zinc, lead and silver from waste residues generated in zinc smelting

A zinc smelting and waste residue technology, applied in the field of comprehensive recovery of zinc, lead and silver, can solve problems such as failure to obtain comprehensive recovery, waste of resources, environmental impact, etc., so as to save costs and expenses, improve enterprise economic benefits, environmental protection and social benefits Effect

Active Publication Date: 2012-10-10
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of zinc smelting slag is produced every year at home and abroad, and the valuable metals in it are generally disposed of by stockpiling and cannot be comprehensively recycled, which not only causes waste of resources, but also has potential impact on the environment

Method used

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  • Method for comprehensively recovering zinc, lead and silver from waste residues generated in zinc smelting
  • Method for comprehensively recovering zinc, lead and silver from waste residues generated in zinc smelting
  • Method for comprehensively recovering zinc, lead and silver from waste residues generated in zinc smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Zinc smelting waste residue is first mixed with 15% sulfuric acid solution, the liquid-solid mass ratio after mixing is 2:1, the temperature is 80°C, fully reacted for 2 hours, and the acid leaching residue is filtered out; then mixed with 30% sulfuric acid solution The solutions are mixed, the liquid-solid mass ratio after mixing is 2:1, the temperature is 80°C, and the reaction is sufficient for 2 hours to obtain the acid leaching solution containing valuable metals such as zinc and the acid leaching residue containing valuable metals such as lead and silver;

[0024] Add lime to the acid leaching solution, control the pH value = 3.5, purify and remove iron at room temperature, add a sodium sulfide solution with a mass fraction (mass fraction of sodium sulfide solution) of 15% in the solution after iron removal to precipitate zinc, until acid leaching The zinc in the solution is all precipitated, and the zinc concentrate and zinc-precipitated solution containing more t...

Embodiment 2

[0031] Zinc smelting waste slag is first mixed with 15% sulfuric acid solution, the liquid-solid mass ratio after mixing is 3:1, the temperature is 85°C, fully reacted for 3 hours, and the acid leaching residue is filtered out; then mixed with 30% sulfuric acid solution The solution is mixed, the liquid-solid mass ratio after mixing is 3:1, the temperature is 85°C, and the reaction is fully carried out for 3 hours to obtain the acid leaching solution containing valuable metals such as zinc and the acid leaching residue containing valuable metals such as lead and silver;

[0032] Add lime to the acid leaching solution, control the PH value = 3.8, purify and remove iron at room temperature, add a sodium sulfide solution with a mass fraction (mass fraction of sodium sulfide solution) of 15% to precipitate zinc, until the acid leaching The zinc in the solution is all precipitated, and the zinc concentrate and zinc-precipitated solution containing more than 45% zinc are obtained;

...

Embodiment 3

[0039] Zinc smelting waste residue is first mixed with 15% sulfuric acid solution, the liquid-solid mass ratio after mixing is 4:1, the temperature is 90°C, fully reacted for 4 hours, and the acid leaching residue is filtered out; then mixed with 30% sulfuric acid solution The solution is mixed, the liquid-solid mass ratio after mixing is 4:1, the temperature is 90°C, and the reaction is fully carried out for 4 hours to obtain the acid leaching solution containing valuable metals such as zinc and the acid leaching residue containing valuable metals such as lead and silver;

[0040] Add lime to the acid leaching solution, control the PH value = 4.0, purify and remove iron at room temperature, add a sodium sulfide solution with a mass fraction (mass fraction of sodium sulfide solution) of 15% in the solution after iron removal to precipitate zinc, until acid leaching The zinc in the solution is all precipitated, and the zinc concentrate and zinc-precipitated solution containing m...

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Abstract

The invention relates to a method for comprehensively recovering zinc, lead and silver from waste residues generated in zinc smelting. The method comprises process steps of conducting acid leaching and zinc leaching by sections, removing impurities by using pickle liquor, leaching lead with alkali section by section, vulcanizing settled lead from alkali leaching liquid, cyaniding leached silver by alkali leaching residues and replacing zinc powders to extract silver through a leaching agent. According to the method, zinc, lead and silver in the waste residues generated by smelting zinc are effectively and comprehensively recovered, not only can resources of waste residues generated by smelting zinc be comprehensively utilized, also the processing process of residues generated by smelting zinc is innovated, the cost and expense are reduced, the economical benefits of enterprises are improved, and reat environment-friendly and social benefits are also created.

Description

technical field [0001] The invention relates to a method for comprehensively recovering zinc, lead and silver from zinc smelting waste residue, and belongs to the technical field of nonferrous metal metallurgy and chemical industry. Background technique [0002] The main raw material of the zinc smelting industry is zinc concentrate, which contains valuable metals such as lead and silver in addition to metal zinc. At present, zinc concentrates are generally processed through oxidation roasting, roasting flue gas purification to produce acid, calcination leaching, leachate purification, electrowinning zinc extraction, and leaching slag storage. The obtained waste slag still contains a small amount of zinc, lead and silver. Due to the different smelting technology levels, the contents of zinc, lead and silver in the waste slag are about 4-10%, 3-12% and 100-300g / t respectively. A large amount of zinc smelting slag is produced every year at home and abroad, and the valuable me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B19/30C22B11/08C22B13/00
CPCY02P10/20
Inventor 徐永祥吕寿明于先进王立新梁志伟
Owner SHANDONG GUODA GOLD
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