An ecological restoration method for layered coverage of gold mine tailings

A technology of ecological restoration and gold mine tailings, applied in the restoration of polluted soil, etc., can solve the problems of unsustainable deep restoration of tailings, secondary environmental pollution, and long restoration period, and achieve obvious effects of ecological environment improvement and low cost Low cost, simple and easy operation

Active Publication Date: 2021-03-26
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ecological restoration method provided by the present invention belongs to the physical-chemical-biological joint restoration method, which can continuously and deeply repair the heavy metal pollution problem of gold mine tailings, and breaks through the secondary environmental pollution and restoration efficiency existing in the existing gold mine tailings restoration methods Low, long remediation period, and the limitations of heavy metal pollution in tailings that cannot be continuously and deeply remediated

Method used

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  • An ecological restoration method for layered coverage of gold mine tailings
  • An ecological restoration method for layered coverage of gold mine tailings
  • An ecological restoration method for layered coverage of gold mine tailings

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preparation example Construction

[0050] The preparation method of the barrier is not particularly limited in the present invention. It is preferred to mix the straw, nano-iron oxide and graphene, and place it in a muffle furnace at 300-450°C for 1.5-3 hours of anoxic carbonization to obtain the barrier. Fe / graphene / biomass carbon composites.

[0051] In the present invention, the graphene / biomass charcoal in the barrier has good adsorption capacity and complexation capacity for heavy metals, which can weaken the mobility of heavy metals and prevent heavy metals from volatilizing or moving upwards with capillary action.

[0052] In the present invention, the bio-organic fertilizer is fermented by EM bacteria starter from raw materials including fungus residue and plant seedlings.

[0053] The present invention does not specifically limit the type of the mushroom residue, preferably at least one of the mushroom residue of Pleurotus eryngii, Pleurotus eryngii, Lentinus edodes and Coprinus comatus. When the bact...

Embodiment 1

[0061] Taking the ecological restoration implemented in a gold mine tailings pond in Pingdu City as an example, the method of layered covering and restoration of gold mine tailings is explained. A comparative experiment on the effects of heavy metal content in surface soil and heavy metal content in plant shoots after applying the ecological restoration method of covering gold mine tailings in layers.

[0062] In the plot test, heavy metal passivation agent and 1% water-soluble carboxymethyl chitosan were used to treat gold mine tailings soil as heavy metal passivation restoration, Fe / graphene / biomass charcoal as barrier, and compound bacterial slag organic fertilizer as Reinforce barriers and cover farmland soil as surface soil, and cover with different coverings to set up different partitions, each with an area of ​​8.0m×10.0m.

[0063] The specific design is as follows: CK group, common farmland soil; T1 group, cover 10.0cm thick common farmland soil on the copper tailings ...

Embodiment 2

[0075] Taking the ecological restoration of a gold mine tailings reservoir in Laizhou as an example, the method of layered covering and restoration of gold mine tailings is explained. After applying the ecological restoration method of covering gold mine tailings in layers, the content of heavy metals in the surface soil, the content of heavy metals in the aboveground parts of plants, and the impact of the form of heavy metals in the tailings were compared.

[0076] In the plot test, heavy metal passivation agent and 1% water-soluble carboxymethyl chitosan were used to treat gold mine tailings soil as heavy metal passivation restoration, Fe / graphene / biomass charcoal as barrier, and compound bacterial slag organic fertilizer as Reinforce barriers and cover farmland soil as surface soil, and cover with different coverings to set up different partitions, each with an area of ​​8.0m×10.0m.

[0077] The specific design is as follows:

[0078] CK group, common farmland soil;

[00...

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Abstract

The invention provides an ecological remediation method for layered coverage gold mine tailings, and relates to the technical field of the mine ecological remediation. The provided remediation methodcomprises the following steps: (1) after covering a surface layer of the gold mine tailings by a heavy metal composite passivator, turning over, and spraying 0.8-1.2% of water-soluble carboxymethyl chitosan solution, to obtain a heavy metal passivated restoration substance; and (2) successively covering the heavy metal passivated restoration substance obtained in the step (1) by an obstructing substance, a bio-organic fertilizer and soil, and realizing ecological remediation of the gold mine tailings. The provided ecological remediation method belongs to a physical-chemical-biological combinedremediation method, and is capable of continuously and deeply remedying a heavy metal pollution problem of the gold mine tailings, and breaking through limitation of a current gold mine tailings remediation method that secondary environment pollution is existent, remediation efficiency is low, a remediation period is long and heavy metal pollution in the tailings cannot be continuously and deeplyremedied.

Description

technical field [0001] The invention relates to the technical field of mine ecological restoration, in particular to an ecological restoration method for covering gold mine tailings in layers. Background technique [0002] With the rapid development of industrial society, the demand for minerals is increasing, and the environmental damage and waste discharge caused by the development and utilization of mineral resources, especially gold mines, have become serious problems. Years of gold mining, heavy metals such as cadmium, lead, and mercury are discharged into the environment along with tailings and wastewater, resulting in serious deterioration of the mine environment. Gold mine tailings dust is easy to fly in the wind, and it is easy to be lost in water. Long-term stacking not only takes up a lot of land, but also poses a hazard to the surrounding natural ecological environment and poses a threat to human health. Therefore, it is of great practical significance to take e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/00B09C1/10
Inventor 宋宁宁王凯荣
Owner QINGDAO AGRI UNIV
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