Method for recovering mercury from mercury-contained tailings in form of selenide

A technology for selenide and tailings, which is applied in the field of mercury recovery, can solve problems such as complex components, and achieve the effects of simple operation, fast reaction speed, and reduction of pollution hazards.

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

In the non-ferrous metal smelting process, the treatment of mercury-containing wastewater and mercury-containing wastewater is the most conce...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 1kg of mercury-containing tailings, add 3L of sodium thiosulfate solution with a concentration of 20g / L, stir and leaching at 50°C for 0.5h, and obtain leaching tailings, leaching liquid and washing liquid after liquid-solid separation; The leaching rate of mobile mercury in the medium is 99%;

[0026] Store the separated leaching tailings; combine the leaching solution and washing solution to obtain 4L of a solution containing 700mg of mercury, and add 0.42g of sodium selenide to the solution. After 5 minutes of reaction, add 1g / L 0.08 L of polyacrylamide slurry was subjected to liquid-solid separation to obtain decomposed liquid and mercury selenide precipitate, which was a recovered product, and 99.98% of the mercury in the solution was converted into mercury selenide precipitate.

Embodiment 2

[0028] Take 1 kg of mercury-containing tailings, add a mixed solution of sodium thiosulfate with a concentration of 8 g / L and ammonium thiosulfate with a concentration of 6 g / L, and add 6 L; stir and leaching at 35 ° C for 2 hours, and obtain after liquid-solid separation Leach tailings, leaching solution and washing solution; sampling analysis shows that the leaching rate of migratable mercury in leaching tailings is 99%;

[0029] Store the separated leaching tailings; combine the leaching solution and washing solution to obtain 7L of a solution containing soluble mercury complexes, which contains 700mg of mercury, add 0.54g of sodium selenide to the solution and react for 10min, then add 2g / L poly 0.09L of acrylamide slurry is subjected to liquid-solid separation to obtain decomposition liquid and mercury selenide precipitate, which is the recovered product, and 99.99% of the mercury in the solution is converted into mercury selenide precipitate;

[0030] The decomposition s...

Embodiment 3

[0032] Take 1kg of mercury-containing tailings, add 10L of sodium thiosulfate solution with a concentration of 8g / L, stir and leaching at 20°C for 3h, and obtain leaching tailings, leaching liquid and washing liquid after liquid-solid separation; sampling analysis, leaching tailings The leaching rate of mobile mercury is 99%;

[0033] Store the separated leaching tailings; combine the leaching solution and washing solution to obtain 11L of a solution containing soluble mercury complexes, which contains 700mg of mercury, add 0.70g of sodium selenide to the solution, react for 7min, add 1.5g / L 0.22 L of polyacrylamide slurry was subjected to liquid-solid separation to obtain decomposed liquid and mercury selenide precipitate, which was a recovered product, and 99.99% of the mercury in the solution was converted into mercury selenide precipitate.

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Abstract

The invention belongs to the field of environmental protection; and aiming at problems of complex components and no proper method for treatment of mercury-contained tailings produced in a nonferrous metal smelting process, the invention discloses a method for recovering mercury from the mercury-contained tailings in a form of selenide. The mercury contained in the mercury-contained tailings is leached out by adopting thiosulfate; and alkali metal selenide is added in solution containing the mercury and thiosulfuric acid radical complex ions, so that the mercury is converted to mercury selenide precipitates with stability, low solubility and low toxicity. The method is simple in operation; after the complex leaching treatment is performed with the thiosulfate solution, the transfer-state mercury in the mercury-contained tailings is largely decreased; and the mercury is finally converted to the precipitates in the form of stored and stable mercury selenide, so that the pollution harm of the mercury in the mercury-contained tailings to the environment is eliminated.

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 in the form of selenide. Background technique [0002] As a typical global pollutant, mercury can threaten the human living environment through migration, transformation and accumulation. For this reason, all countries are very concerned about the harm of mercury, and require to reduce mercury emissions, reduce the supply and demand of mercury, control the amount of mercury used in products, prevent mercury exposure, increase awareness of mercury control, and promote international mercury control. [0003] At present, the national environmental protection department has formulated clear discharge standards for the discharge of mercury-containing waste gas and mercury-containing wastewater. Regarding the mercury removal treatment of mercury-containing waste gas and mercury-containing wastewater before discharge,...

Claims

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Application Information

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