Improvement method of extremely acidified mine soil

A soil and mine technology, applied in the field of contaminated soil remediation, can solve problems such as difficult to achieve, high cost, incomplete oxidation of metal sulfides, etc., to achieve the effects of inhibiting dissolution, improving physical structure, and reducing the catalytic ability of iron oxidation

Pending Publication Date: 2020-03-06
SHAOGUAN TAOLIN GREEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical isolation method is to cover one to several layers of inert materials on the surface of acidic soil to form isolation layers such as low-permeability sealing layer, moisture isolation layer, and erosion prevention layer. This method is usually very expensive, and it is difficult to accomplish
The alkaline neutralization method is to add an alkaline neutralizer to neutralize the acid in the acidic soil. However, in many cases, it is difficult to completely neutralize the acidic substances produced by the oxidation of pyrite by applying an alkaline neutralizer alone. , even if the existing soil acidity is effectively neutralized in a short period of time, the metal sulfides stored in the soil generally cannot be completely oxidized. The soil begins to acidify again

Method used

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  • Improvement method of extremely acidified mine soil
  • Improvement method of extremely acidified mine soil
  • Improvement method of extremely acidified mine soil

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1 Soil Improvement of Copper Mine Tailings Pool

[0036] The implementation site is located in the acidification tailings pond of a copper mine in Jiujiang, Jiangxi Province, and a 100m×40m area was selected as the experimental site. The original soil conditions in this area are very harsh, the pH of the tailings is as low as 2.5, the degree of soil acidification and acid production potential are very serious, and there is no plant growth in the area. The area is governed by the following method steps:

[0037] (1) Surface modification of extremely acidified mine soil;

[0038] (2) Apply plant growth-promoting bacteria, phosphate-dissolving bacteria, and sulfate-reducing bacteria in the lower layer of acidified soil, and the application rate is 0.6 tons / ha (the three kinds of bacteria are applied in equal proportions). When applying, the soil is opened to a depth of 10 cm, and the backfill the soil;

[0039] (3) Spread one deck of slaked lime on the surface o...

Embodiment 2

[0046] Embodiment 2 Copper Mine Dump Soil Improvement

[0047] The implementation site is located on the top plane of the acid dump of a copper mine in Shangrao, Jiangxi Province, and a 200m×40m area was selected as the experimental site. The original condition of the soil in this area is very bad, with a pH as low as 2.6, the degree of acidification and acid production potential of the soil are very serious, basically covered by gravel, and there is no plant growth in the area. The area is governed by the following method steps:

[0048] (1) Surface modification of extremely acidified mine soil;

[0049] (2) Apply plant growth-promoting bacteria and sulfate-reducing bacteria bacterial agents in the lower layer of acidified soil, and the application rate is 0.5 tons / ha (the two bacterial agents are applied in equal proportions). When applying, the soil is turned to a depth of 10 cm, and the soil is backfilled after application;

[0050] (3) pave one deck of slaked lime on th...

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Abstract

Belonging to the technical field of contaminated soil remediation, the invention particularly relates to an improvement method of extremely acidified mine soil. The method utilizes an improving agentand a microbial agent to change the microbial community structure of soil, especially reduce the relative abundance of iron-sulfur oxidation acid production microorganisms and inhibit metal sulfide from oxidizing and producing acid. The improving agent can be utilized for adsorption, chelation, complexing and immobilization of heavy metal ions and reduction of the biological toxicity, thus reducing the diffusion and leakage of heavy metal ions to surrounding soil or water. The improvement method provided by the invention has the advantages of low investment cost, good acidification control andheavy metal stabilization effect, substantial increase of nutrient content, no destruction of the soil structure, and easy implementation.

Description

technical field [0001] The invention relates to a method for improving extremely acidified mine soil, and belongs to the technical field of contaminated soil remediation. Background technique [0002] Acidification of mining waste is a very serious environmental problem that is getting more and more attention in China and even in the world. Most non-ferrous metal ores exist as various types of metal sulfides, such as pyrite (FeS 2 ), chalcopyrite (CuFeS 2 ), sphalerite (ZnS), galena (PbS), arsenopyrite (FeAsS), etc. The chemical and biological properties of sulfide in ore are very stable, and its chemical oxidation is a very slow process. However, activities such as mining, dressing and smelting will bring metal-sulfur minerals (mainly pyrite FeS 2 ) exposed to the air, coupled with the effect of natural forest solution, fully contacted with air and water vapor, under the catalysis of iron ions and iron / sulfur oxidizing microorganisms, the oxidation reaction will rapidly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08B09C1/10A01B79/02A01C21/00A01G22/00A01G17/00C05G3/80C09K17/40C09K101/00C09K109/00
CPCA01B79/02A01C21/00A01G17/005A01G22/00B09C1/00B09C1/08B09C1/10B09C1/105B09C2101/00C05D3/02C09K17/40C09K2101/00C09K2109/00
Inventor 杨涛涛舒玮杨金金毛喆张金桃曾俊英
Owner SHAOGUAN TAOLIN GREEN TECH
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