Solidifying agent for treating chromium-polluted soil

A technology for chromium-contaminated soil and a curing agent is applied in the field of curing agents for treating chromium-contaminated soil, and can solve the problems of low consumption of industrial waste residues, and achieve the effects of low production cost, good water resistance and low dissolution.

Inactive Publication Date: 2012-07-18
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stabilizer uses Portland cement clinker obtained by high-temperature calcination as one of the main components, and the amount of industrial waste residue is relatively low

Method used

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  • Solidifying agent for treating chromium-polluted soil
  • Solidifying agent for treating chromium-polluted soil

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Embodiment Construction

[0021] Table 1 is a group (8) of embodiments of the present invention. Table 1 lists the constituent raw materials and their weight percentages of each embodiment. The constituent raw materials are all ground slag, ground steel slag, metakaolin, fly ash, ferrous chloride and alkali activator, the free water content of each constituent raw material is not higher than 2%, and the sum of the weight percentages is 100%. Ground slag, ground steel slag, fly ash, and alkali activator are all commercially available products. The ground slag meets the requirements of GB / T 18046-2008, the ground steel slag meets the requirements of GB / T 20491-2006, and the fly ash meets the requirements of GB1596 -2005 requirements, each raw material is measured according to the ratio and mixed evenly in the mill.

[0022] The components of each implementation in Table 1 are commercially available commodities or industrial waste residues, and the amount of industrial waste residues is relatively large,...

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Abstract

The invention discloses a solidifying agent for treating chromium-polluted soil, which comprises the following raw materials by weight: 40-65% of ground mineral slag, 10-20% of ground steel slag, 10-20% of meta-kaolin, 15-25% of an alkali-activator, 0-10% of pulverized coal ash, and 0-3% of ferrous chloride, wherein the free water contents of the raw materials are all not higher than 2%, and the above components are proportionally configured and uniformly mixed in a grinding machine. The product disclosed by the invention is used for solidifying chromium-polluted soil, and has both reducing property and gel property; and the dissolution rate of chromium in the solidified body is low and does not rebound with time, while the solidified body has high strength and good water resistance, and can be used for brickmaking and other building material purposes.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a curing agent for treating chromium-polluted soil. Background technique [0002] Chromium and its compounds are widely used in various fields of industrial production, and are indispensable raw materials for industries such as metallurgy, electroplating, leather, printing and dyeing, etc., resulting in a large amount of chromium-contaminated soil. The toxicity of chromium mainly comes from hexavalent chromium, which is extremely harmful to the human body and is one of the three internationally recognized carcinogenic metals. Disposal or remediation of chromium-contaminated soil is a major issue in environmental protection. [0003] In chromium-contaminated soil, hexavalent chromium exists not only on the surface of soil particles, but also inside the particles. There is a problem of poor contact between the hexavalent chromium inside the soil particles and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/12C04B28/08
Inventor 陈胡星杨尚源刘浩徐小希
Owner ZHEJIANG UNIV
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