Method for treating mercury-contained tailings by heap leaching-precipitate stabilization

A technology of stabilization treatment and heap leaching, applied in the direction of improvement of process efficiency, etc., can solve the problems of no effective treatment of mercury-containing cyanide tailings, environmental pollution hazards, etc., achieve low treatment cost, reduce pollution hazards, and simple operation Effect

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 addition, in the smelting process of extracting gold by cyanidation method, due to the high grade of mercury in some gold ore raw ores, after cyanidation treatment, mercury is mainly dispersed into cyanide tailing liquid and cyanide tailings, and this part contains mercury cyanide. There is no effective way to deal with the tailings
[0006] The existence of a large amount of mercury-containing tailings brings serious potential pollution hazards to the environment
However, due to its large amount, remote location, and limited by traffic and cost factors, a large amount of mercury-containing tailings cannot be effectively treated by the mature roasting-condensation method.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Sodium thiosulfate solution with a concentration of 20g / L was used as the heap leaching solution for heap leaching of mercury-containing tailings, and the spray intensity was 10L / m 2 h, after 12 hours of spraying and sampling analysis, the remaining migratable mercury in the mercury-containing tailings was 3.8mg / kg, and the mercury content in the leachate was 1.2g / L;

[0025] Store the tailings after heap leaching; collect the leaching solution into the decomposition tank, under natural conditions, through the joint action of ultraviolet and visible light in sunlight and oxygen and carbon dioxide contained in the air, after 48 hours of decomposition, the mercury content in the leaching solution 99.98% of the mercury in the leach solution is converted into mercury sulfide precipitates.

Embodiment 2

[0027] Ammonium thiosulfate solution with a concentration of 10g / L was used as the heap leaching solution for heap leaching of mercury-containing tailings, and the spray intensity was 30L / m 2 h, after 24 hours of spraying and sampling analysis, the remaining migratable mercury in the mercury-containing tailings was 4.2mg / kg, and the mercury content in the leachate was 1.1g / L;

[0028] Store the tailings after heap leaching; collect the leaching solution into the decomposition tank, under natural conditions, through the joint action of ultraviolet and visible light in sunlight and oxygen and carbon dioxide contained in the air, after 72 hours of decomposition, the mercury content in the leaching solution Reduced to 0.3mg / L, 99.97% of the mercury in the leach solution is converted to mercury sulfide precipitation;

[0029] Add the ammonium thiosulfate to the leach solution after the decomposition, after making the ammonium thiosulfate concentration in the solution be 10g / L, the ...

Embodiment 3

[0031] Use a mixed solution of ammonium thiosulfate with a concentration of 10g / L and sodium thiosulfate with a concentration of 10g / L for heap leaching of mercury-containing tailings, with a spray intensity of 20L / m 2 h, after 12 hours of circulating spray heap leaching, sampling and analysis of the remaining migratable mercury in the mercury-containing tailings was 3.5mg / kg, and the mercury content in the leachate was 1.2g / L;

[0032] Store the tailings after heap leaching; collect the leaching solution into the decomposition tank, under natural conditions, through the joint action of ultraviolet and visible light in sunlight and oxygen and carbon dioxide contained in the air, after 48 hours of decomposition, the mercury content in the leaching solution 99.97% of the mercury in the leach solution is converted into mercury sulfide precipitates.

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Abstract

The invention belongs to the field of environmental protection; and as mercury-contained tailings produced by the nonferrous metal smelting industry cannot be effectively treated, and bring serious potential pollution hazard to the environment, the invention provides a method for treating the mercury-contained tailings by adopting heap leaching-precipitate stabilization. The method adopts thiosulfate solution as heap leaching liquid to perform the heap leaching for the mercury-contained tailings, and adopts a circular spray heap leaching mode to obtain leaching liquid; the obtained leaching liquid is gathered in a decomposition pool; a thiosulfate complex of mercury is decomposed and precipitated to stable mercury sulfide; and the decomposed leaching liquid is continuously returned to the heap leaching step to be used as the heap leaching liquid. As the mercury, in a transfer state, in the mercury-contained tailings is finally converted to mercury sulfide precipitate with high stability, low solubility and low toxicity, the stability of the mercury in the mercury-contained tailings is realized, and the environmental pollution hazard from the mercury in the mercury-contained tailings can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a heap leaching-sedimentation stabilization method for treating mercury-containing tailings. Background technique [0002] Mercury and its compounds are mostly highly toxic substances. For this reason, strict discharge standards have been set for mercury-containing waste gas and mercury-containing wastewater to avoid the harm of mercury to the environment and human body. [0003] In order to prevent mercury from polluting the atmosphere, absorption methods, adsorption methods, gas phase reaction methods, cooling methods and combined purification methods are commonly used to purify mercury vapor. For typical mercury-containing solid wastes such as waste fluorescent lamps, waste batteries, waste thermometers, etc., they are mostly collected and treated by roasting-condensation method. In the mercury smelting process, the processing and use of mercury-containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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