Curing agent for restoring heavy metal contaminated soil

A technology of polluted soil and curing agent, applied in the field of contaminated soil treatment, can solve the problems of secondary pollution of curing agent, re-release of heavy metal ions, deep burial into the ground, etc., and achieve remarkable results

Inactive Publication Date: 2011-02-02
TONGJI UNIV
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  • Summary
  • Abstract
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Problems solved by technology

Its main disadvantages are: the application area is narrow, that is, some curing agents are effective for some heavy metal ions but not effective for others; the cost is high; some curing agents themselves have secondary pollution, such as fly ash; the curing agent is cured for a long time The effect is unstable. For example, the organic curing agent is easy to decompose after two or three years, so the fixed heavy metal ion

Method used

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Examples

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Example Embodiment

[0018] The following examples further describe the features of the present invention and other related features in detail to facilitate the understanding of those skilled in the industry:

[0019] The highly absorbent clay minerals referred to in the present invention refer specifically to clays or minerals with small particles, specific surface area, special voids, and fiber structures that have adsorption capacity. In the present invention, their adsorption performance is mainly used to Absorb heavy metal ions in the soil. The selection idea of ​​each component of the present invention is: cement as the main cementing agent can easily form insoluble complexes with heavy metal ions (such as Pb, Gd, etc.) in a relatively alkaline environment, thereby stabilizing heavy metal ions; high adsorption The clay adsorbs the heavy metal ions in the soil and can fix the adsorbed heavy metal ions by the wrapping effect of the cement; while the quicklime is mainly used to provide a higher al...

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Abstract

The invention relates to the technical field of contaminated soil treatment, in particular to a curing agent for restoring heavy metal contaminated soil. The curing agent comprises the following components in percentage by weight: 25 to 40 percent of cement, 40 to 65 percent of high-adsorbability clay mineral and 10 to 20 percent of quicklime. The curing agent has the advantages of no risk of secondary pollution when heavy metal ions are fixed by the high-adsorbability clay mineral and no obvious change of original soil property. The components of the high-adsorbability clay mineral are close to those of the original powdered clay, so great damage to a soil structure by the cement and the quicklime is avoided. Therefore, the curing agent also has the advantages of obvious effect of restoring heavy metal plane source contaminated agricultural land and good social, economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of contaminated soil treatment, in particular to a curing agent for repairing soil polluted by heavy metals. Background technique [0002] At present, the remediation technologies for heavy metal-contaminated soil mainly include: replacement and filling method, biological remediation method, chemical fixation method, electrodynamic remediation method, etc. Among them, the replacement method is only suitable for small areas and heavily polluted soil; the bioremediation method has the advantages of low treatment cost and high cleaning level, but it takes a long time for restoration and is greatly limited by the type of pollutants; The repair method has different effects in different soil types, or even has the opposite effect, and the cost is high and the operation equipment is complicated, which is not conducive to large-scale application. The solidification and remediation technology of heavy metal polluted...

Claims

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Application Information

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IPC IPC(8): C09K17/10B09C1/08C09K17/06C09K17/08C09K101/00
Inventor 席永慧吴晓峰
Owner TONGJI UNIV
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