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Method for recovering mercury from mercury-contained tailings through complexing extraction and consolidating decomposition

A technology for leaching slag and tailings, applied in the field of mercury recovery, can solve problems such as large amount and complex composition, and achieve the effects of simple operation, low solubility and complete reaction

Active Publication Date: 2014-09-10
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a solution using complexation leaching-strengthening for the mercury-containing tailings produced in the production process of non-ferrous metal mines and non-ferrous smelting enterprises. A method for decomposing and recovering mercury from mercury-containing tailings. This method is simple to operate and converts the migratory mercury in mercury-containing tailings into mercuric sulfide and / or mercury selenide precipitates with low solubility, high stability and low toxicity. Recycling helps reduce the pollution hazards of mercury in mercury-containing tailings to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 1kg of mercury-containing tailings, add 3L concentration of 30g / L sodium thiosulfate and 0.3g / L sodium selenosulfate mixed solution, stir and leaching at room temperature for 1.0h, and obtain leaching tailings, leachate and Washing liquid; sampling analysis shows that the leaching rate of migratory mercury in the leaching tailings is 99%, and the separated leaching tailings are piled up;

[0027] Combine the leaching solution and the washing solution to obtain 4L of a solution containing soluble mercury complexes, heat the solution to 85°C and forcefully decompose it for 12 hours, then add 0.04L of 1g / L polyacrylamide slurry for liquid-solid separation to obtain the decomposition solution And mercury selenide precipitation, 99.98% of the mercury in the solution is converted into mercury-containing precipitates.

Embodiment 2

[0029] Get 1kg of mercury-containing tailings, add 10L concentration of 30g / L sodium thiosulfate solution, stir and leaching at room temperature for 3.0h, obtain leaching tailings, leaching liquid and washing liquid after liquid-solid separation; sampling analysis, leaching tailings can be The leaching rate of mobile mercury is 99%, and the separated leaching tailings are stored;

[0030] Combine the leaching liquid and washing liquid to obtain 11L solution containing soluble mercury complex, heat the solution to 60°C, blow in carbon dioxide gas at a volume of 0.5L per minute, force decomposition for 10h, and then add 2g / L polyacrylamide slurry 0.2L, for liquid-solid separation to obtain decomposition liquid and mercury sulfide precipitate, 99.96% of mercury in the solution is converted into mercury-containing precipitate;

[0031] Add sodium thiosulfate to the obtained decomposed solution to make the concentration 30g / L, and then return to the stirring and leaching step to ci...

Embodiment 3

[0033] Take 1 kg of mercury-containing tailings, add 10 L of a mixed solution with a concentration of 10 g / L sodium thiosulfate and 0.15 g / L sodium selenosulfate, stir and leaching at room temperature for 5.0 h, and obtain leaching tailings, leachate and Washing liquid; sampling analysis shows that the leaching rate of migratory mercury in the leaching tailings is 99%, and the separated leaching tailings are piled up;

[0034] Combine the leaching liquid and washing liquid to obtain 11L solution containing soluble mercury complexes, heat the solution to 75°C, blow in carbon dioxide gas at a volume of 0.25L per minute, force decomposition for 4 hours, and then add 2g / L polyacrylamide slurry 0.15L, for liquid-solid separation to obtain decomposition liquid and mercury selenide precipitate, 99.97% of mercury in the solution is converted into mercury-containing precipitate.

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Abstract

The invention belongs to the field of environmental protection; and aiming at problems of high quantity, complex components and no proper process treatment of mercury-contained tailings generated by nonferrous metal mines and nonferrous smelting enterprises in a production process, the invention discloses a method for recovering mercury from the mercury-contained tailings through complexing extraction and consolidating decomposition. The method comprises the following steps: the complexing extraction is performed for the mercury-contained tailings by adopting mixed solution of thiosulfate and selenium generation of sulfate, so that transfer-state mercury in the mercury-contained tailings is transferred into leaching agent; and the consolidating decomposition is performed for the mercury in the leaching agent and a complex, formed by a thiosulfuric acid radical and a selenium generation of sulfuric acid radical, through a method of heating and feeding carbon dioxide gas, so that the mercury is finally converted to stable mercury sulfide / mercury selenide to form precipitates. The method is simple in operation; and the transfer-state mercury in the mercury-contained tailings is converted to a form of mercury sulfide and / or mercury selenide precipitates with low solubility, high stability and low toxicity, so that the pollution harm of the mercury in the mercury-contained tailings to environment is effectively reduced.

Description

technical field [0001] The invention belongs to the field of environmental protection and relates to a method for recovering mercury from mercury-containing tailings by adopting complexation leaching and enhanced decomposition. Background technique [0002] Mercury is a heavy metal pollutant with strong biological toxicity in the environment. It is difficult to be excreted after entering the organism, which seriously threatens human health. In the past ten years, the concentration of mercury in the environment has continued to rise around the world, which has attracted great attention from governments and environmental protection organizations, and has become another global environmental problem after climate change. [0003] At present, absorption method, adsorption method, gas phase reaction method, cooling method and combined purification method are commonly used in domestic purification of mercury vapor. Among them, the absorption method mostly uses substances with high...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B43/00
CPCY02P10/20
Inventor 路殿坤畅永锋谢锋韩超张廷安
Owner NORTHEASTERN UNIV
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