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Heavy metal immobilizing agent and method for immobilization and stabilization of soil heavy metals by using heavy metal immobilizing agent

A curing agent and heavy metal technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve problems such as affecting social stability, harming people's health, endangering environmental safety, etc., and achieving good curing effect and raw materials. Inexpensive, good curing effect

Inactive Publication Date: 2014-06-04
云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, heavy metal pollution has a great impact on people's quality of life and physical health, seriously damages public health, endangers environmental safety, and affects social stability.

Method used

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  • Heavy metal immobilizing agent and method for immobilization and stabilization of soil heavy metals by using heavy metal immobilizing agent
  • Heavy metal immobilizing agent and method for immobilization and stabilization of soil heavy metals by using heavy metal immobilizing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, the mass percentages of the components of curing agent A are: fly ash 70%, cement 10%, carbide slag 20%; solid-liquid ratio of curing agent B is 0.3W / W. The specific method steps are as follows:

[0038] a. Select the heavy metal-contaminated soil and the solidifying agent A at a mass ratio of 20:100 to select the heavy metal-contaminated soil, mix and stir the heavy metal-contaminated soil and the solidifying agent A to obtain a uniform mixture;

[0039]b. Bake the homogeneous mixture in step a in an oven at 105°C for 2h to 4h;

[0040] c. Add curing agent B according to the solid-to-liquid ratio of 0.3W / W, stir evenly, and put it into a mold for molding;

[0041] d. Remove the mold after 24 hours, and maintain them for 28 days under natural conditions.

[0042] f. Use "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007) to carry out toxic leaching of heavy metal contaminated soil after curing agent treatmen...

Embodiment 2

[0048] The mass percentages of the components of curing agent A in this embodiment are: fly ash 65%, cement 10%, carbide slag 25%; solid-liquid ratio of curing agent B is 0.3W / W. The specific method steps are as follows:

[0049] a. Select the heavy metal-contaminated soil and the solidifying agent A at a mass ratio of 25:100 to select the heavy metal-contaminated soil, mix and stir the heavy metal-contaminated soil and the solidifying agent A to obtain a uniform mixture;

[0050] b. Bake the homogeneous mixture in step a in an oven at 105°C for 2h to 4h;

[0051] c. Add curing agent B according to the solid-to-liquid ratio of 0.3W / W, stir evenly, and put it into a mold for molding;

[0052] d. Remove the mold after 24 hours, and maintain them for 28 days under natural conditions.

[0053] f. Use "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007) to carry out toxic leaching of heavy metal contaminated soil after curing agent treatmen...

Embodiment 3

[0056] In this embodiment, the mass percentages of the components of curing agent A are: fly ash 60%, cement 15%, carbide slag 25%; solid-liquid ratio of curing agent B is 0.4W / W. The specific method steps are as follows:

[0057] a. Select the heavy metal-contaminated soil and the solidifying agent A at a mass ratio of 30:100 to select the heavy metal-contaminated soil, mix and stir the heavy metal-contaminated soil and the solidifying agent A to obtain a uniform mixture;

[0058] b. Bake the homogeneous mixture in step a in an oven at 105°C for 2h to 4h;

[0059] c. Add curing agent B according to the solid-to-liquid ratio of 0.4W / W, stir evenly, and put it into a mold for molding;

[0060] d. Remove the mold after 24 hours, and maintain them for 28 days under natural conditions.

[0061] f. Use "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007) to carry out toxic leaching of heavy metal contaminated soil after curing agent treatme...

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Abstract

The invention belongs to the technical field of restoration of heavy metal-contaminated soil and especially relates to a heavy metal immobilizing agent and a method for immobilization and stabilization of soil heavy metals by using the heavy metal immobilizing agent. The heavy metal immobilizing agent is composed of an immobilizing agent A and an immobilizing agent B, wherein the immobilizing agent A comprises, by mass, 40 to 80% of fly ash, 5 to 20% of cement and 20 to 40% of carbide slag, and the immobilizing agent B is an aqueous alkali (with a solid-liquid ratio of 0.2 to 0.6). The invention has the following advantages: (1) used raw materials are cheap, and a part of industrial waste is utilized, thereby realizing treatment of wastes with the waste; and (2) the prepared heavy metal immobilizing agent has a good immobilization effect, and the heavy metal leaching rate of immobilized heavy metal-contaminated soil meet requirements prescribed in Identification Standards for Hazardous Wastes (GB5085.3-2007).

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil, and in particular relates to a heavy metal curing agent and a method for curing and stabilizing soil heavy metals using the heavy metal curing agent. Background technique [0002] At present, heavy metal pollution has a great impact on people's quality of life and physical health, seriously damages public health, endangers environmental safety, and affects social stability. Heavy metal pollution has the characteristics of long-term, cumulative, latent and irreversible. It is harmful, difficult to control, and high in cost. In particular, the risk of ecotoxicity induced by heavy metals has attracted more and more attention, especially those related to food production. Soil heavy metal pollution has received widespread attention. [0003] In recent years, my country has also attached great importance to the prevention and control of heavy metal pollution. In April ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/12C09K17/10B09C1/08
Inventor 吴学勇张涛尚江涛牛学奎王金华毕延涛
Owner 云南省环境科学研究院(中国昆明高原湖泊国际研究中心)
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