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Heavy metal contaminated soil remediation agent as well as preparation method and application thereof

A technology for polluted soil and heavy metals, applied in the restoration, application, soil conditioning materials and other directions of polluted soil, can solve problems such as the limitation of solidification/stabilization efficiency, and achieve the effects of low cost, reduced intercalation difficulty, and no energy consumption cost.

Active Publication Date: 2022-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a heavy metal-contaminated soil remediation agent and its preparation method and application, aiming to solve the technical defect in the prior art that the solidification / stabilization efficiency of materials applied to heavy metal-contaminated soil remediation is limited

Method used

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  • Heavy metal contaminated soil remediation agent as well as preparation method and application thereof
  • Heavy metal contaminated soil remediation agent as well as preparation method and application thereof
  • Heavy metal contaminated soil remediation agent as well as preparation method and application thereof

Examples

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preparation example Construction

[0052] In order to realize efficient and simultaneous treatment of soil polluted by various heavy metals, the present invention provides a preparation method of a heavy metal-contaminated soil remediation agent, comprising:

[0053] S1, provide a mixed salt solution of calcium salt and aluminum salt;

[0054] S2, mixing the mixed salt solution and the grains of wheat grains at a pH of 12-13 to obtain a mixed solution A; Carry out solid-liquid separation treatment to the mixed solution A to obtain a calcium-aluminum hydrotalcite material loaded on the grains of wheat grains ;

[0055] S3, mixing the spent grains-loaded calcium-aluminum hydrotalcite material with a tetrathiomolybdate solution to obtain a mixed solution B; performing a solid-liquid separation treatment on the mixed solution B to obtain the heavy metal contaminated soil remediation agent.

[0056] Further, the molar ratio of calcium element and aluminum element in the calcium-aluminum hydrotalcite material loaded...

Embodiment 1

[0070] A preparation method of a heavy metal polluted soil remediation agent, comprising:

[0071] 1. Provide a mixed salt solution of calcium salt and aluminum salt: Weigh 1.8892 g of calcium nitrate and 0.75 g of aluminum nitrate and dissolve them in 100 mL of deionized water to obtain the mixed salt solution.

[0072] 2. Weigh 1.32g of ball-milled dried grains of wheat grains into the mixed salt solution, stir and mix evenly to obtain a premixed solution; weigh 8.8g of NaOH and dissolve it in 100mL of deionized water, and add the NaOH solution into the mixed solution. In the premixed solution, mixed solution A was obtained; magnetic stirring was carried out for 30 min, and the stirring speed was kept at 800 rpm.

[0073] 3. Weigh 0.0027g of ammonium tetrathiomolybdate and dissolve it in 50 mL of deionized water to obtain an ammonium tetrathiomolybdate solution with a concentration of 0.2075mmol / L, and add 1g of the above-mentioned steps to the ammonium tetrathiomolybdate so...

Embodiment 2

[0075] A preparation method of a heavy metal polluted soil remediation agent, comprising:

[0076] In the preparation process of the heavy metal-contaminated soil remediation agent in this example, compared with Example 1, only the quality conditions of the spent grains added to the mixed salt solution are changed.

[0077] That is: weigh 0.53 g of ball-milled dried grains of wheat spent grains and add it to the mixed salt solution, and other conditions are the same as those in Example 1.

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Abstract

The invention provides a preparation method of a heavy metal contaminated soil remediation agent. The preparation method comprises the following steps: providing a mixed salt solution of calcium salt and aluminum salt; mixing the mixed salt solution and the spent grain particles under the condition that the pH value is 12-13 to obtain a mixed solution A; carrying out solid-liquid separation treatment on the mixed solution A to obtain a spent grain loaded calcium-aluminum hydrotalcite-like material; mixing the spent grain loaded calcium-aluminum hydrotalcite-like material with a tetrathiomolybdate solution to obtain a mixed solution B; and carrying out solid-liquid separation treatment on the mixed solution B to obtain the heavy metal contaminated soil remediation agent. Compared with the prior art, the heavy metal contaminated soil remediation agent achieves efficient and simultaneous treatment of soil contaminated by various heavy metals, solves the technical problem that intercalation treatment of hydrotalcite is difficult in the prior art, and has the advantages of being simple in preparation method, free of energy consumption, low in cost, capable of avoiding secondary pollution, high in applicability and the like.

Description

technical field [0001] The invention relates to the field of heavy metal contaminated soil remediation, in particular to a heavy metal contaminated soil remediation agent and a preparation method and application thereof. Background technique [0002] It is known that human activities are the main contributors to the migration of heavy metals into the soil environment. Heavy metal-contaminated soils, especially lead and cadmium-contaminated soils, have the characteristics of wide pollution range, high pollution intensity and great harm in individual areas. With the continuous occurrence of blood lead poisoning incidents and "cadmium rice" incidents in China in recent years, it shows that soil lead and cadmium pollution has caused serious threats to national health and ecological environment security. Fixing governance is imminent. [0003] The existing remediation methods for contaminated soil include: first, reducing the concentration of pollutants in the soil, such as phyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/08
CPCC09K17/40B09C1/00B09C1/08
Inventor 赵飞平杨志辉何方书刘琳张煜镓蒋雯王丹阳杨卫春廖骐司梦莹
Owner CENT SOUTH UNIV
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