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Curing and stabilizing agent capable of reducing leaching toxicity of heavy metals in soil and preparation method of curing stabilizer

A stabilizer and heavy metal technology, which is applied in the field of solidification stabilizer and its preparation to reduce the leaching toxicity of heavy metals in soil, can solve the problems of competing adsorption and affecting the analysis of heavy metals, so as to improve the compressive strength and crack resistance , shrinkage and expansion coefficient reduction effect

Active Publication Date: 2018-01-19
CHINESE RES ACAD OF ENVIRONMENTAL SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, if a variety of anions coexist, there will be a problem of competing for adsorption with each other, which will affect the analysis of heavy metals to varying degrees.

Method used

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  • Curing and stabilizing agent capable of reducing leaching toxicity of heavy metals in soil and preparation method of curing stabilizer
  • Curing and stabilizing agent capable of reducing leaching toxicity of heavy metals in soil and preparation method of curing stabilizer
  • Curing and stabilizing agent capable of reducing leaching toxicity of heavy metals in soil and preparation method of curing stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0037] See Table 1 for the components of the solidification stabilizer for reducing the leaching toxicity of heavy metals in soil provided by Examples 1-4 and the parts by weight of each component.

[0038] The parts by weight of each embodiment curing stabilizer composition of table 1

[0039] Example

Embodiment 5-8

[0041] See Table 2 for the components of the solidification stabilizer for reducing the leaching toxicity of heavy metals in soil provided in Examples 5-8 and the parts by weight of each component.

[0042] The parts by weight of each embodiment curing stabilizer composition of table 2

[0043] Example

Embodiment 9-12

[0045] See Table 3 for the components of the solidification stabilizer for reducing the leaching toxicity of heavy metals in soil provided by Examples 9-12 and the parts by weight of each component.

[0046] The parts by weight of each embodiment curing stabilizer composition of table 3

[0047] Example

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Abstract

The invention provides a curing and stabilizing agent capable of reducing leaching toxicity of heavy metals in soil and a preparation method of the curing and stabilizing agent. The curing and stabilizing agent is mainly prepared from cement, sodium sulfide slag, ferrous chloride, phosphogypsum and an additive, can reduce the leaching toxicity of the heavy metals such as Pb and Cd in the soil, canpersistently and effectively cure and stabilize heavy metal pollutants in the soil, and has a good repair effect on the soil; a content of the available heavy metals in the repaired soil is significantly lower than that specified in the national standard; the heavy metals have low possibility of leaching; and the possibility of a secondary pollution phenomenon is low.

Description

technical field [0001] The invention belongs to the field of soil stabilizers, in particular to a solidification stabilizer for reducing the leaching toxicity of heavy metals in soil and a preparation method thereof. Background technique [0002] When the soil is polluted by heavy metals, pH adjustment is often used to make heavy metals form insoluble hydroxides to reduce the bioavailability of heavy metals in soil and stabilize heavy metals. The stability of heavy metal hydroxides has a very narrow optimal pH value range, usually falling between 9-11, and its stability is quite sensitive to pH changes, usually a change of one pH value unit (whether it is acidic or alkaline) change) will result in a solubility increase of ≥ 1 order of magnitude. When soil pH changes with natural conditions, the solubility of heavy metal hydroxides also changes, heavy metals are easy to dissolve again, and the stabilization effect is also lost, forming a rebound. [0003] The solubility of ...

Claims

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Application Information

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IPC IPC(8): C04B28/14
Inventor 刘俐马福俊伍斌张倩谷庆宝
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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