Method for solidification stabilization of heavy metal contaminated soil with fly ash as raw material

A technology of contaminated soil and fly ash, applied in the field of soil pollution control, can solve the problems of solidification and stabilization of soil with little heavy metal content, and achieve the effect of easy operation, low cost and short repair time

Inactive Publication Date: 2020-06-30
陕西地建土地工程技术研究院有限责任公司
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Problems solved by technology

However, the current research object is only to use fly ash as a raw material, to study artificially added powdered heavy metal reagents or heavy metal-containin...

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  • Method for solidification stabilization of heavy metal contaminated soil with fly ash as raw material

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing and specific embodiment content of the present invention is described in further detail:

[0039] A method for solidifying and stabilizing Pb polluted soil with fly ash as raw material, comprising the following steps:

[0040] 1) Prepare intermediate materials and alkali activator

[0041] 1.1) Mix sodium hydroxide and water glass solution, use sodium hydroxide to adjust the water glass modulus of water glass solution to 2.0, i.e. silicon / sodium=2.0, and use it as an alkali activator after aging for 24 hours;

[0042] 1.2) Pb-contaminated soil and fly ash are mixed as an intermediate material, and mixed according to the following mass ratio according to the situation:

[0043] If the Pb-contaminated soil is slightly polluted (1-2 times the first-class land use control value of GB36600-2018, 800-1600 mg·kg -1 ), the mass ratio of Pb polluted soil to fly ash is 1~4: 6~9, preferably, 4: 6;

[0044] If the Pb-contaminated so...

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Abstract

The invention provides a method for solidification stabilization of heavy metal contaminated soil with fly ash as a raw material. A feasible method is provided for treatment of the heavy metal contaminated soil. The method comprises the following steps: (1) an intermediate material and an alkali activator are prepared, specifically, sodium hydroxide and a water glass solution are mixed as the alkali activator, and the heavy metal contaminated soil and the fly ash are mixed as the intermediate material; (2) material mixing is conducted, specifically, the intermediate material and the alkali activator are mixed according to a mass ratio of 5:(2 to 3); and (3) a solidification body is prepared, specifically, after a mixed material is stirred, slurry is prepared and poured into a mold, compaction forming is conducted, after curing, demolding is conducted, and the solidification body capable of conducting solidification stabilization on heavy metal in the soil is prepared. The mode that thefly ash is taken as the basic raw material to solidify and remediate the heavy metal contaminated soil is adopted, and part of the contaminated soil replaces the fly ash to prepare geopolymers so that the effect of 'using waste to treat waste' can be achieved.

Description

technical field [0001] The invention belongs to soil pollution control technology, in particular to a solidification and stabilization method for heavy metal polluted soil using fly ash as a raw material. Background technique [0002] At present, soil pollution control methods mainly include physical remediation, biological remediation and chemical remediation. [0003] Common physical remediation methods include alien soil and soil replacement method, pyrolysis method, isolation and embedding method, etc.; common biological remediation methods include phytoremediation and microbial remediation; and common chemical remediation methods include curing stabilization method, chemical leaching method, and chemical oxidation method. restore etc. Usually, physical remediation and chemical remediation have the advantages of obvious and rapid treatment effect for heavily polluted and small-area soil. [0004] Among them, the solidification and stabilization method in chemical remed...

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Application Information

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IPC IPC(8): B09B3/00
CPCB09B3/20
Inventor 王璐瑶谢潇牛岩彭飚叶胜兰魏雨露李劲彬齐丽舒晓晓刘思琪
Owner 陕西地建土地工程技术研究院有限责任公司
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