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Method for repairing cyanide-polluted soil by physical heat analysis technology

A technology for polluted soil and cyanide, applied in the field of soil remediation, can solve problems such as difficult large-scale engineering applications, changing soil physical and chemical properties, and increasing remediation costs.

Inactive Publication Date: 2016-03-23
ZHONGKE DINGSHI ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding chemical agents to the soil not only greatly changes the physical and chemical properties of the soil, but the additional liquid phase also puts forward high requirements on the subsequent dehydration of the soil, which greatly increases the cost of remediation and makes it difficult for large-scale engineering applications

Method used

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  • Method for repairing cyanide-polluted soil by physical heat analysis technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The cyanide-contaminated soil of a certain site has been tested to have a volatile cyanide content of 560mg / kg, and it is required to restore it to below 8.0mg / kg (Class B of the "Soil Environmental Quality Evaluation Standard for Exhibition Sites").

[0023] Method flow chart as figure 1 As shown, the specific operation steps are as follows:

[0024] (1) The moisture content of the cyanide-contaminated soil at the site by physical means θ m Control is 13%;

[0025] (2) Mechanically crush the cyanide-contaminated soil until the diameter of the aggregate is less than 2cm, and carry out quality control through a hanging vibrating screen, and the oversize can be mechanically crushed again by physical means before screening;

[0026] (3) Put the cyanide-contaminated soil in batches for roasting in a tube furnace. The roasting temperature is selected to be 300-600° C., and the roasting time is 10-20 minutes. After the soil physical thermal analysis is completed, it is cool...

Embodiment 2

[0031] The cyanide-contaminated soil of a certain site was tested to have a total cyanide content of 157.2 mg / kg, which needs to be restored to below 0.90 mg / kg (Class A of the "Soil Environmental Quality Evaluation Standard for Exhibition Sites").

[0032] Method flow chart as figure 1 As shown, the specific operation steps are as follows:

[0033] (1) The moisture content of the cyanide-contaminated soil at the site by physical means θ m Control is 18%;

[0034] (2) Mechanically crush the cyanide-contaminated soil until the diameter of the aggregate is less than 2cm, and carry out quality control through a hanging vibrating screen, and the oversize can be mechanically crushed again by physical means before screening;

[0035] (3) Put the cyanide-contaminated soil in batches for roasting in a tube furnace. The roasting temperature is selected to be 300-600° C., and the roasting time is 10-20 minutes. After the soil physical thermal analysis is completed, it is cooled to roo...

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Abstract

The invention discloses a method for repairing cyanide-polluted soil by a physical heat analysis technology. The method comprises such steps as control of a water content theta m of the cyanide-polluted soil below 20%, smashing of the soil to reach an aggregate diameter below 2 cm, feeding of the soil into a physical heat analysis kiln for repairing and tail gas treatment. The method is adopted to repair the cyanide-polluted soil, so that the high-concentration cyanide-polluted soil can be treated, the problem that the soil physicochemical properties are largely changed by a chemical oxidation method is solved, the soil dehydration difficulty in actual engineering operation is prevented, and the repair rate can reach above 99%.

Description

technical field [0001] The invention relates to a repair method for cyanide-contaminated soil, in particular to a method for repairing cyanide-contaminated soil by using physical thermal analysis technology, and the invention belongs to the technical field of soil repair. Background technique [0002] Soil is the material basis for human survival. With the rapid development of industry, cyanide enters the soil system through various channels, endangering human health. my country's cyanide-contaminated soil has a long history of pollution, a large area of ​​pollution, high remediation costs, and low remediation effects. There is a huge difference from foreign contaminated sites. Therefore, the development of new remediation methods has become an urgent requirement. [0003] The remediation of cyanide-contaminated soil abroad mostly adopts physical and biological methods. However, physical methods, such as fake seal method and foreign soil method, require a large amount of en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/065B09C1/08
Inventor 殷晓东杨勇黄海何云飞李鹏张文牛静田立斌杜伟徐峰
Owner ZHONGKE DINGSHI ENVIRONMENTAL ENG CO LTD
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