Five-layer coverage forced reduction in-situ mineralization restorative method

A repair method and in-situ technology, applied in botany equipment and methods, restoration of contaminated soil, horticulture, etc., can solve heavy metal pollution of tailings ponds, water and soil loss of tailings ponds, and secondary environmental pollution that cannot be continuously and deeply repaired and other issues, to achieve the effect of reducing rainwater infiltration, low cost, and solving pollution

Active Publication Date: 2017-11-21
北科蕴宏环保科技(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a five-layer covering strong reduction in-situ mineralization repair method to solve the environmental pollution caused by water and soil loss and dust in the tailings reservoir, the secondary environmental pollution existing in the existing tailings reservoir restoration technology and the existing tailings reservoir. Problems such as heavy metal pollution in tailings ponds cannot be continuously and deeply repaired in mine restoration technology

Method used

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  • Five-layer coverage forced reduction in-situ mineralization restorative method

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Experimental program
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Effect test

Embodiment 1

[0045] The five-layer structure from top to bottom in the five-layer covering strong reduction in-situ mineralization restoration method is as follows:

[0046] Non-polluted guest soil layer 1 is composed of non-polluted guest soil with a thickness of 20cm;

[0047] The clay sealing layer 2 is composed of cohesive soil and has a thickness of 5 cm;

[0048] Biomass reduction sealing layer 3, by weight percentage, includes 20% of straw and 80% of chicken manure, and its thickness is 5cm;

[0049] The main reaction layer 4, by weight percentage, includes 1% of steel slag powder, 1% of desulfurized gypsum, 2% of straw, 4% of chicken manure, and 92% of tailings, and its thickness is 30cm;

[0050] Raw tailings layer 5.

[0051] The steps of the five-layer covering strong reduction in-situ metallogenic restoration method to control heavy metal pollution in mines are as follows:

[0052] (1) 1% of steel slag powder, 1% of desulfurized gypsum, 2% of straw, and 4% of chicken manure ...

Embodiment 2

[0064] The five-layer structure from top to bottom in the five-layer covering strong reduction in-situ mineralization restoration method is as follows:

[0065] Non-polluted guest soil layer 1 is composed of non-polluted guest soil with a thickness of 25cm;

[0066] The clay sealing layer 2 is composed of bentonite and has a thickness of 2 cm;

[0067] Biomass reduction sealing layer 3, by weight percentage, includes bagasse 30%, pig manure 70%, and its thickness is 3cm;

[0068] The main reaction layer 4, by weight percentage, includes 0.5% of lime powder, 1% of phosphogypsum, 1% of bagasse, 2.5% of pig manure, and 95% of tailings, and its thickness is 25cm;

[0069] Raw tailings layer 5.

[0070] The steps of the five-layer covering strong reduction in-situ metallogenic restoration method to control heavy metal pollution in mines are as follows:

[0071] (1) 0.5% of lime powder, 1% of phosphogypsum, 1% of bagasse, and 2.5% of pig manure according to the main reaction laye...

Embodiment 3

[0084] The five-layer structure from top to bottom in the five-layer covering strong reduction in-situ mineralization restoration method is as follows:

[0085] Non-polluted guest soil layer 1 is composed of non-polluted guest soil with a thickness of 30cm;

[0086] The clay sealing layer 2 is composed of kaolin and has a thickness of 1 cm;

[0087] Biomass reduction sealing layer 3, by weight percentage, includes sawdust 10%, cow dung 90%, and its thickness is 5cm;

[0088] The main reaction layer 4, by weight percentage, includes fly ash powder 2%, lemon gypsum 4%, sawdust 0.5%, cow dung 3.5%, tailings 90%, and its thickness is 40cm;

[0089] Raw tailings layer 5.

[0090] The steps of the five-layer covering strong reduction in-situ metallogenic restoration method to control heavy metal pollution in mines are as follows:

[0091] (1) 2% of fly ash powder, 4% of lemon gypsum, 0.5% of sawdust, and 3.5% of cow dung according to the weight percentage of the main reaction lay...

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Abstract

The invention provides a five-layer coverage forced reduction in-situ mineralization restorative method, and belongs to the technical field of mine environment ecological restoration. A five-layer structure involved in the method particularly comprises a non-pollution new soil layer, a clay sealing layer, a biomass reduction sealing layer, a main reaction layer and an original tailing layer. The method comprises the steps that organic matter in biomass on the main reaction layer is taken as the reducing agent, arsenic in a high oxidation state is reduced into arsenic in a low oxidation state or in a reduced state under the effect of anaerobic bacteria, and sulphur in a high oxidation state is reduced into sulphur in a reduced state, so that the minerals of realgar, orpiment and the like are formed again; and meanwhile, a large amount of iron is reduced to form iron pyrite, arsenopyrite, pyrrhotite and other minerals with the low solubility, and the heavy metals of Pb<2+>, Zn<2+>, Cu<2+>, Hg<2+>, Cd<2+>, Sb<3+> and the like form galena, blende, copper pyrites, cinnabar, greenockite, stibnite and other sulfide minerals with the extremely low solubility, so that mine heavy metal pollution in-situ mineralization restoration is achieved.

Description

technical field [0001] The invention relates to the technical field of ecological restoration of mine environment, in particular to a five-layer covering strong reduction in-situ mineralization restoration method. Background technique [0002] The current industrial system is actually a process of mining resources and discharging waste. Mining activities are the main source of waste discharge to the environment, and its solid waste discharge accounts for 80% to 85% of industrial waste discharge. There are more than 9,000 large and medium-sized mines and 260,000 small mines in China, and the land area occupied by mining is close to 40,000km 2 , resulting in an area of ​​330 km of abandoned land 2 / a. In the process of mining, open-pit mining sites, dumps, tailings sites, subsidence areas, and lands polluted by heavy metals that have lost economic value are called mine wastelands. Mine solid wastes such as coal gangue, power plant fly ash, and metal mine tailings are a maj...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09B3/00A01G1/00
CPCA01G22/00B09B3/00B09C1/00B09C1/105B09C2101/00
Inventor 倪文高巍马旭明徐东王珂李涵
Owner 北科蕴宏环保科技(北京)有限公司
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