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Arsenic-antimony combined polluted soil remediation agent and preparation method and application thereof

A combined pollution and soil remediation technology, applied in the field of contaminated soil remediation, can solve the problems of low remediation efficiency, achieve high remediation efficiency, low cost, and no secondary pollution

Pending Publication Date: 2022-04-08
桂润环境科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the physical and chemical properties of arsenic and antimony are significantly different from those of other heavy metals, mainly manifested in the fact that the toxicity of high-valence arsenic and antimony is lower than that of low-valence arsenic and antimony, and that arsenic and antimony are relatively stable under acidic conditions, conventional remediation agents have remediation efficiency in remediating arsenic-antimony compound-contaminated soil low problem

Method used

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  • Arsenic-antimony combined polluted soil remediation agent and preparation method and application thereof
  • Arsenic-antimony combined polluted soil remediation agent and preparation method and application thereof

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preparation example Construction

[0025] The invention provides a preparation method of arsenic-antimony composite polluted soil remediation agent, comprising the following steps:

[0026] Mixing soluble iron salt, soluble aluminum salt and water to obtain Fe-Al mixed solution;

[0027] The Fe-Al mixed solution and the soluble carbonate solution are mixed and activated to obtain a Fe-Al composite modifier;

[0028] The Fe-Al composite modifier is mixed with bentonite slurry for modification to obtain the arsenic-antimony composite contaminated soil remediation agent.

[0029] The invention mixes soluble iron salt, soluble aluminum salt and water to obtain Fe-Al mixed liquid.

[0030] In the present invention, the soluble iron salt is preferably a soluble ferric salt, more preferably including FeCl 3 , Fe 2 (SO 4 ) 3 and Fe(NO 3 ) 3 one or more of.

[0031] In the present invention, the soluble aluminum salt preferably includes AlCl 3 、Al 2 (SO 4 ) 3 and Al(NO 3 ) 3 one or more of.

[0032] In th...

Embodiment 1

[0079] The preparation process of arsenic-antimony compound polluted soil remediation agent:

[0080] Crush the sodium-based bentonite to -100 mesh, add water to prepare a suspension with a concentration of 10%, let it stand for 2 hours, and separate the upper slurry to obtain the bentonite slurry.

[0081] According to mass ratio FeCl 3 : AlCl 3 =2:5, weigh iron salt and aluminum salt, add ultrapure water to prepare 0.5mol / L Fe-Al mixed liquid; under the condition of vigorous stirring, molar ratio n Fe+Al :n CO3 2- = Add 0.2mol / L Na dropwise at a ratio of 1:1 2 CO 3 solution, the dropping rate is 5mL / min, after the dropwise addition, continue to stir and react for 1h, put it in a 60°C water bath for aging reaction for 2d, and obtain the Fe-Al composite modifier.

[0082] Take the bentonite slurry, under the condition of constant stirring at 60°C, according to the mass ratio M (Fe+Al) :M 膨润土 = Add Fe-Al composite modifier dropwise at a ratio of 0.3:1, and the dropping ...

Embodiment 2

[0091] The preparation process of arsenic-antimony compound polluted soil remediation agent:

[0092] Crush the sodium-based bentonite to -100 mesh, add water to prepare a suspension with a concentration of 15%, let it stand for 2 hours, and separate the upper slurry to obtain the bentonite slurry.

[0093] According to mass ratio FeCl 3 : AlCl 3 =0.3:1, weigh iron salt, aluminum salt, add ultrapure water to be mixed with Fe-Al mixed solution of 0.2mol / L; Fe+Al :n CO3 2- = Add 0.5mol / L Na dropwise at a ratio of 1:1 2 CO 3 Solution, the dropping rate is 3mL / min, after the dropwise addition, continue to stir and react for 1h, put it in a 70°C water bath for aging reaction for 2d, and obtain the Fe-Al composite modifier.

[0094] Take the bentonite slurry, under the condition of constant stirring at 70°C, according to the mass ratio M (Fe+Al) :M 膨润土 = Add Fe-Al composite modifier dropwise at a ratio of 0.2:1, and the dropping rate is 3mL / min. After the dropwise addition, ...

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Abstract

The invention provides an arsenic-antimony combined contaminated soil remediation agent and a preparation method and application thereof, and belongs to the technical field of contaminated soil remediation. Soluble ferric salt, soluble aluminum salt and water are mixed, and Fe-Al mixed liquid is obtained; the Fe-Al mixed solution and a soluble carbonate solution are mixed for activation, and a Fe-Al composite modifier is obtained; and the Fe-Al composite modifier and bentonite slurry are mixed for modification, and the arsenic-antimony composite contaminated soil remediation agent is obtained. The Fe-Al mixed solution is activated through the soluble carbonate solution to obtain an iron-containing group and an aluminum-containing group, and the obtained iron-containing group and aluminum-containing group are introduced into a bentonite structure, so that bentonite is solidified and has the capability of stabilizing arsenic and antimony; meanwhile, heavy metals such as copper, lead, cadmium, chromium and nickel are acted through adsorption, complexation, interlayer ion exchange and surface reaction of bentonite, so that the heavy metals are prevented from being dissolved out again, secondary pollution is not generated, and the repairing effect is not influenced.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to an arsenic-antimony compound polluted soil remediation agent, a preparation method and application thereof. Background technique [0002] In recent years, due to the release of a large amount of heavy metals into the soil environment by human industrial production, mining and other activities, the problem of soil heavy metal pollution has become increasingly serious. Because soil heavy metals cannot be degraded, they are long-term, concealed and irreversible, and they are easy to migrate to the human food chain with environmental changes, which has gradually become one of the main problems that endanger human health and safety. With the development of industry and agriculture and the continuous use of chemicals containing arsenic and antimony, the pollution of arsenic and antimony has attracted increasing attention. Arsenic and antimony belong to the same m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 薛天利王晓飞魏江州涂方祥孙帮周张宇昕蒙宏培孙美娟李灵知闭道军
Owner 桂润环境科技股份有限公司