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Method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud

A technology for copper smelting and acid sludge, which is applied in the field of comprehensive recovery of selenium, mercury, and lead in copper smelting acid sludge, can solve the problems of adverse effects of selenium recovery and purification, complex composition of copper smelting acid sludge, complicated technological process, etc. It is difficult to deal with mercury-containing flue gas, improving separation efficiency and treatment effect, and the effect of simple process

Inactive Publication Date: 2018-06-29
云南省固体废物管理中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the complex composition of copper smelting acid mud, it is extremely difficult to process
At present, the existing acid mud treatment method is krafting and roasting method. The acid mud is dried and then roasted, and the mercury in the roasting flue gas is recovered by condensation. Complex process and other issues
However, the method of directly leaching selenium from the acid mud can also be adopted, but the mercury element in the acid mud will have an adverse effect on the recovery and purification of selenium
The recovery method of valuable metals in other acid muds is complex in process and high in cost

Method used

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  • Method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The chemical composition of the copper smelting acid sludge treated in this embodiment includes: Pb 53.64-57.7%, Se 1.03-2.52%, Hg 0.70-1.31%, Cu 0.21%-0.28, As 0.13-0.34%.

[0029] A method for comprehensively recovering lead, mercury and selenium in copper smelting acid mud, specifically comprising the following steps:

[0030] 1) Mix 20g of copper smelting acid mud with 1.5mol / L nitric acid solution at a liquid-solid ratio of 5:1, gradually add 1.0mol / L sodium hypochlorite solution at 20vol% to carry out oxidation leaching reaction, stir and leaching for 60min at room temperature, and the stirring rate is 500r / min to obtain a mixed solution containing mercuric chloride and selenic acid. The chemical reaction of the leaching process is as follows:

[0031] HgSe+3NaClO+2HNO 3 →HgCl 2 +NaCl+H 2 SeO 3 +2NaNO 3,

[0032] 2) Separating the leachate obtained in step 1) into solid-liquid, the oxidizable selenium and mercury in the acid mud enter the leachate in a solu...

Embodiment 2

[0038] The chemical composition of the copper smelting acid sludge treated in this embodiment includes: Pb 53.64-57.7%, Se 1.03-2.52%, Hg 0.70-1.31%, Cu 0.21%-0.28, As 0.13-0.34%.

[0039] A method for comprehensively recovering lead, mercury and selenium in copper smelting acid mud, specifically comprising the following steps:

[0040] 1) Mix 20g of copper smelting acid mud with 1.2mol / L nitric acid solution at a liquid-solid ratio of 6:1, gradually add 1.0mol / L sodium hypochlorite solution at 15vol% to carry out oxidation leaching reaction, stir and leaching for 60min at room temperature, and the stirring rate is 500r / min to obtain a mixed solution containing mercuric chloride and selenic acid. The chemical reaction of the leaching process is as follows:

[0041] HgSe+3NaClO+2HNO 3 →HgCl 2 +NaCl+H 2 SeO 3 +2NaNO 3,

[0042] 2) Separating the leachate obtained in step 1) into solid-liquid, the oxidizable selenium and mercury in the acid mud enter the leachate in a solu...

Embodiment 3

[0048] The chemical composition of the copper smelting acid sludge treated in this embodiment includes: Pb 53.64-57.7%, Se 1.03-2.52%, Hg 0.70-1.31%, Cu 0.21%-0.28, As 0.13-0.34%.

[0049] A method for comprehensively recovering lead, mercury and selenium in copper smelting acid mud, specifically comprising the following steps:

[0050] 1) Mix 20g of copper smelting acid mud with 1.5mol / L nitric acid solution at a liquid-solid ratio of 6:1, gradually add 1.0mol / L sodium hypochlorite solution at 20vol% to carry out oxidation leaching reaction, stir and leaching for 45min at room temperature, and the stirring rate is 500r / min to obtain a mixed solution containing mercuric chloride and selenic acid. The chemical reaction of the leaching process is as follows:

[0051] HgSe+3NaClO+2HNO 3 →HgCl 2 +NaCl+H 2 SeO 3 +2NaNO 3,

[0052] 2) Separating the leachate obtained in step 1) into solid-liquid, the oxidizable selenium and mercury in the acid mud enter the leachate in a solu...

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Abstract

The invention relates to a method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud, and belongs to the technical field of comprehensive utilization of solid waste.The method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud specifically includes the following steps that copper smelting acid mud and a nitric acid solution are mixed at a liquid-solid ratio of 5:1, the stirring rate is 500 r / min, and sodium hypochlorite is gradually added and reacted at normal temperature for 60 minutes to obtain a mixed solution containing mercury chloride and selenic acid; separated filter residues are sent to a lead smelting system for recycling, and sodium hypophosphite is added into filtrate to reduce ionized mercury in the solutionto settleable elemental mercury, after flocculation and sedimentation, the mercury-containing slag is separated by microfiltration, and refined mercury is obtained by continuous rectification and purification; and sodium sulfite is added into the filtrate for reduction to obtain crude selenium, and the wastewater can be returned to the leaching process for recycling after neutralization reaction.The method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud adopts leaching and sectional reduction to realize effective separation of mercury and selenium, the recovery rate of selenium is 98.7%, and the recovery rate of mercury is up to 98.9%. The operation is simple, the cost is low, and the lead-containing filter residue returning process after leaching canrealize comprehensive utilization of resources.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and in particular relates to a method for comprehensive recovery of lead, mercury and selenium in copper smelting acid mud. Background technique [0002] In the process of producing acid from the flue gas of non-ferrous metal copper smelting, the heavy metals volatilized in the raw materials are washed and settled by dynamic wave washing during flue gas purification to form acid mud, which mainly contains lead, selenium, mercury and other components. Due to different sources of raw materials, the content of selenium It can be as high as 2-10%, and the mercury content can reach 0.5-5%. In addition, there are a small amount of heavy metal elements such as zinc, cadmium, copper, and arsenic. Copper smelting acid sludge is a high-value-added hazardous waste. If it is not properly treated and disposed of, it will cause great harm to the environment and human health. ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00C22B43/00C01B19/02
CPCC01B19/02C22B7/007C22B13/045C22B43/00Y02P10/20
Inventor 黄凯孙科源胡若鹏李贞邢杰王晓丽何宗良杨雪
Owner 云南省固体废物管理中心
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