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Solidifying stabilizer for reducing leaching toxicity of heavy metals in soil and preparation method thereof

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 , Durable and effective curing and stabilization effect

Active Publication Date: 2020-12-22
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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  • Solidifying stabilizer for reducing leaching toxicity of heavy metals in soil and preparation method thereof
  • Solidifying stabilizer for reducing leaching toxicity of heavy metals in soil and preparation method thereof
  • Solidifying stabilizer for reducing leaching toxicity of heavy metals in soil and preparation method thereof

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 1 2 3 4 cement 10 20 30 40 Soda sulfide slag 30 35 15 20 Ferrous chloride 10.5 7.2 9 5 Phosphogypsum 10 15 5 6 Ca-montmorillonite -- 5 8 6.5 potassium iodide -- 1.5 2.5 1 clay -- 3 5 6.5

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 5 6 7 8 cement 45 25 35 30 Soda sulfide slag 10 20 25 30 Ferrous chloride 8 10.5 7.5 9 Phosphogypsum 4 7 12 9.5 Ca-montmorillonite 6 9.5 7 10 potassium iodide 3.5 3 1.5 2.8 clay 14 10 4 9 Dioctyl sodium sulfosuccinate 2.5 0.5 1 1.5 ammonium lauryl sulfate 2.2 1.2 3.5 1.5

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 9 10 11 12 cement 30 40 15 35 Soda sulfide slag 22.5 30 17.5 20 Ferrous chloride 6.5 10 8.5 3.5 Phosphogypsum 10 11 14 11.5 Ca-montmorillonite 8.5 9.5 11 7.8 potassium iodide 2 1 2.2 1.7 clay 7 8.5 11 10.5 Dioctyl sodium sulfosuccinate 2 1.7 1.2 1.5 ammonium lauryl sulfate 1.7 2.5 3 2.3 tetradecyl benzyl ammonium chloride 3.5 4.5 5 4 polyvinyl acetate 1.5 2 2.5 2.2

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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 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, and heavy metals are easily redissolved, and the stabilization effect is also lost, forming a rebound. [0003] The solubility of heavy me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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