Remediation method for mercury-contaminated acid soil of mine

A technology of acidic soil and remediation method, which is applied in the field of mercury-contaminated soil vegetation remediation, which can solve the problems of unsuitable mine environment, large soil disturbance, and high remediation cost, so as to reduce leaching and migration, strengthen fixation effect, and reduce environmental risks. Effect

Inactive Publication Date: 2021-06-22
江苏和而同环境建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the harm caused by mercury leaching from mercury-contaminated acidic soil into surface water bodies, and the technical problems of existing metho

Method used

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  • Remediation method for mercury-contaminated acid soil of mine

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Comparison scheme
Effect test

Embodiment 1

[0027] A method for remediating acidic soil contaminated by mercury in mines, comprising the steps of:

[0028] (1) Pretreatment of the contaminated soil area to be repaired: remove construction waste, crush the contaminated soil in the area to be repaired to a particle diameter of 2.5 mm to 3 mm, and control the soil moisture content to 35 wt% by spraying water;

[0029] (2) In-situ curing / stabilization repair: After crushing, add compound curing / stabilizing agent, the compound curing / stabilizing agent is a mixture of iron sulfide, cement, and quicklime, and the amount of quicklime and cement added is 3% of the soil quality and 2% of the soil quality of iron sulfide. Use an excavator to mix the soil and the agent evenly until the soil color is uniform and the particles are uniform. After mixing evenly, cure for 1-2 days;

[0030] (3) Barrier and anti-seepage: cover clay, layered compaction, the average thickness of the cover clay after compaction is 300mm, the top compaction ...

Embodiment 2

[0036] A method for remediating acidic soil contaminated by mercury in mines, comprising the steps of:

[0037] (1) Pretreatment of the contaminated soil area to be repaired: remove construction waste, crush the contaminated soil in the area to be repaired to a particle diameter of 1 mm to 2.5 mm, and control the soil moisture content to 30 wt% by spraying water;

[0038](2) In-situ curing / stabilization repair: After crushing, add compound curing / stabilizing agent, the compound curing / stabilizing agent is a mixture of iron sulfide, cement, and quicklime, and the amount of quicklime added is 1 / 2 of the soil mass. 2%, the amount of cement added is 3% of the soil mass, and the amount of iron sulfide added is 2% of the soil mass. Use an excavator to mix the soil and the agent evenly until the soil color is uniform and the particles are uniform. After mixing evenly, cure for 1- 2 days;

[0039] (3) Barrier and anti-seepage: cover clay, layered compaction, the average thickness of ...

Embodiment 3

[0045] A method for remediating acidic soil contaminated by mercury in mines, comprising the steps of:

[0046] (1) Pretreatment of the contaminated soil area to be repaired: remove construction waste, crush the contaminated soil in the area to be repaired to a particle diameter of 3 mm to 4.5 mm, and control the soil moisture content to 40 wt% by spraying water;

[0047] (2) In-situ curing / stabilization repair: After crushing, add compound curing / stabilizing agent, the compound curing / stabilizing agent is a mixture of iron sulfide, cement, and quicklime, and the amount of quicklime added is 1 / 2 of the soil mass. 3%, the amount of cement added is 2% of the soil mass, and the amount of iron sulfide added is 2% of the soil mass. Use an excavator to mix the soil and the agent evenly until the soil color is uniform and the particles are uniform. After mixing evenly, cure for 1- 2 days;

[0048] (3) Barrier and anti-seepage: cover clay, layered compaction, the average thickness of...

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Abstract

The invention relates to a restoration method for mercury-contaminated acid soil of a mine. The restoration method comprises the steps of pretreatment of a to-be-restored area of the contaminated soil, in-situ solidification/stabilization restoration, blocking and seepage prevention, building of a retaining wall, covering of foreign soil, building of a drainage ditch and restoration of vegetation. In allusion to mine acid mercury-contaminated soil, especially farmland remediation in a mine area, the compound mercury contamination treatment agent is adopted, a mixture of iron sulfide, cement and quick lime is added, the addition amounts of the quick lime and the cement are respectively 2-3% of the mass of the soil, and the addition amount of the iron sulfide is 2% of the mass of the soil. The mercury content in the contaminated soil containing water can be reduced to an extremely small amount, the fixing effect on mercury pollutants is enhanced, the mercury pollutants are prevented from being leached into surrounding water, the property of acid soil is improved, plant growth is facilitated, and the aim of ecological remediation is achieved. The method is low in cost, high in compressive strength and obvious in economic benefit.

Description

technical field [0001] The invention relates to the technical field of vegetation restoration of mercury-contaminated soil, in particular to a restoration method for mercury-contaminated acidic soil in mines. Background technique [0002] With the promulgation of the country's "Ten Soil Articles", soil pollution control has become an important content in the field of environmental pollution prevention and control. In the prevention and control of soil pollution, the prevention and control of heavy metal pollution is the job with the widest coverage, the heaviest task, the most difficult and the most investment. [0003] my country is a major producer and consumer of mercury, accounting for about 50% of the world's total consumption. The amount of mercury released into the atmosphere by human-made mercury sources is about 600 tons per year, accounting for about 25% of global emissions. Mercury pollution is not only large in quantity, but also has a wide range of impacts, inv...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08B09C1/10
CPCB09C1/00B09C1/08B09C1/105B09C2101/00
Inventor 陈博阳孙进赵雅楠刘沁一
Owner 江苏和而同环境建设有限公司
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