Novel composite curing agent for heavy metal Cd contaminated soil and use method of novel composite curing agent

A composite curing agent and polluted soil technology, which is applied in the field of contaminated soil treatment, can solve the problems of affecting soil reuse and high cost, achieve good economic benefits and engineering application prospects, avoid secondary pollution, and reduce the effect of leaching

Pending Publication Date: 2022-06-21
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantages are better control of the conditions of the treatment process, better contact with pollutants, and easy control of the discharge of "three wastes" generated during the treatment process; the disadvantage is that it needs to be excavated and transported before treatment, which will affect the quality of the treated soil. Reuse and usually more expensive

Method used

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  • Novel composite curing agent for heavy metal Cd contaminated soil and use method of novel composite curing agent
  • Novel composite curing agent for heavy metal Cd contaminated soil and use method of novel composite curing agent
  • Novel composite curing agent for heavy metal Cd contaminated soil and use method of novel composite curing agent

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Effect test

Embodiment 1

[0034] The components of a novel composite curing agent for heavy metal Cd polluted soil are: red mud and fly ash, and the mixing ratio is 1:1 to obtain a fly ash mixture, alkaline activators NaOH and Na 2 SiO 3 The ratio is 9:1. Combining NaOH with Na 2 SiO 3 Mix evenly in a ratio of 9:1, and dissolve into water to make a solution of 8mol / L, which is used as an alkaline activator. The red mud was obtained from an aluminum plant, dried, ground and passed through a 2mm sieve. The mass percentages of its main components and each component are shown in Table 1. The fly ash was obtained from a coal-fired power plant, dried, ground, and passed through a 2mm sieve. The main components are shown in Table 3.

[0035] The above-mentioned method for using a novel composite solidifying agent for heavy metal Cd-contaminated soil, comprising the following steps:

[0036] (1) excavating, crushing and screening the soil contaminated by heavy metal Cd to be repaired to obtain fine-grained ...

Embodiment 2

[0041] The components of a novel composite curing agent for heavy metal Cd polluted soil are: red mud and blast furnace slag, and the mixing ratio is 7:3 to obtain a blast furnace slag mixture, alkaline activators NaOH and Na 2 SiO 3 The ratio is 9:1. Combining NaOH with Na 2 SiO 3 Mix evenly in a ratio of 9:1, and dissolve into water to make a solution of 8mol / L, which is used as an alkaline activator. The red mud is the same as in Example 1, and the blast furnace slag is taken from an iron smelting plant, dried and ground and passed through a 2mm sieve, and its main components are shown in Table 2.

[0042] The above-mentioned method for using a novel composite solidifying agent for heavy metal Cd-contaminated soil, comprising the following steps:

[0043] (1) excavating, crushing and screening the soil contaminated by heavy metal Cd to be repaired to obtain fine-grained soil;

[0044] (2) fully mixing the blast furnace slag mixture with the fine-grained soil in a mass ...

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Abstract

The invention provides a novel composite curing agent for heavy metal Cd contaminated soil and a use method thereof, the novel composite curing agent comprises red mud, blast furnace slag and an alkali activator or red mud, fly ash and an alkali activator, the mixing ratio of the red mud to the blast furnace slag is 7: 3, and the mixing ratio of the red mud to the fly ash is 1: 1. And the ratio of NaOH to Na2SiO3 in the alkaline exciting agent is 9: 1. Soil to be remediated is crushed and screened to obtain fine-grained soil, and the blast furnace slag mixture or the fly ash mixture and the fine-grained soil are fully mixed and evenly stirred to form the fine-grained soil compound. And uniformly spraying an aqueous solution of an alkaline activator into the fine-grained soil compound to enable the water content to reach 15-20%, and fully and uniformly mixing. And standing the mixed soil for 7-28 days to solidify the soil polluted by the heavy metal ions. The curing agent disclosed by the invention not only can remarkably reduce the content of heavy metals in soil, but also can improve the bearing capacity of a soil body, so that the effects of treating wastes with wastes and turning wastes into wealth are achieved.

Description

technical field [0001] The invention belongs to the technical field of polluted soil treatment, and in particular relates to a novel composite curing agent for heavy metal Cd polluted soil and a method for using the same. Background technique [0002] In recent years, my country's urban industrialization has developed rapidly, but environmental pollution problems have also followed. Among them, soil pollution has reached a level that cannot be ignored, and heavy metals are one of the main pollution sources, which are directly related to human production, life and health problems. At present, it is not only necessary to effectively deal with heavy metal-contaminated soil, but also to go in the same direction with relevant national environmental governance policies, and to explore economical, efficient and environmentally friendly governance methods according to local conditions. [0003] Heavy metals, refers to the density greater than 4.5g / cm 3 In terms of environmental po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/12B09C1/08
CPCC09K17/12B09C1/08
Inventor 李丽华方亚男肖衡林刘数华陶高梁刘永莉李文涛钟楚珩周鑫隆徐维生李昊
Owner HUBEI UNIV OF TECH
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