Soil repairing agent used for fixing heavy metal element in polluted soil, preparation method and application thereof

A technology of soil remediation agent and polluted soil, which is applied in the field of preparation of soil remediation agent, can solve the problems of reducing the physical and chemical effectiveness of pollutants, and achieve the effects of significant economic advantages, convenient use, and good immobilization

Active Publication Date: 2015-03-11
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Effectively solve the problem of heavy metal pollution in soil and realize the chemical remediation of polluted environment; by reducing the physical and chemical effectiveness of pollutants, the purpose of treating and remediating polluted soil is finally achieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A soil remediation agent for fixing heavy metal elements in polluted soil, the solid powder granular soil remediation agent consists of a soil heavy metal chemical fixative component (A), a soil heavy metal adsorbent component (B), a soil conditioner component ( C) Mixed evenly. in:

[0039] The soil heavy metal chemical fixative (A) is prepared by mixing 50% of thiourea, 15% of sodium sulfide and 35% of sulfur.

[0040] The soil heavy metal adsorbent (B) is prepared by mixing 15% of expanded vermiculite and 85% of natural zeolite.

[0041] The soil conditioner (C) is prepared by mixing 75% of trisodium phosphate and 25% of calcium hydroxyphosphate.

[0042] Soil heavy metal chemical fixing agent (A) 20%, soil heavy metal adsorbent (B) 20%, soil conditioner (C) 60% mix and make 100kg of the powder granular soil remediation agent that is used for heavy metal fixing in polluted soil.

[0043] 100kg of above-mentioned solid powder granular soil remediation agent and 99....

Embodiment 2

[0045] A soil remediation agent for fixing heavy metal elements in polluted soil, the solid powder granular soil remediation agent consists of a soil heavy metal chemical fixative component (A), a soil heavy metal adsorbent component (B), a soil conditioner component ( C) Mixed evenly. in:

[0046] The soil heavy metal chemical fixative (A) is 100% thiourea.

[0047] The soil heavy metal adsorbent (B) is prepared by mixing 15% of expanded vermiculite and 85% of natural zeolite.

[0048] Soil conditioner (C) is trisodium phosphate 100%.

[0049] Soil heavy metal chemical fixing agent (A) 47.6%, soil heavy metal sorbent (B) 15%, soil conditioner (C) 37.4% mix and make the powder granular soil remediation agent 100kg that is used for heavy metal fixing in polluted soil, this soil remediation The agent is a powder product with a particle size not greater than 2mm.

[0050] 100kg and 900kg (dry basis) of the above-mentioned solid powder granular soil remediation agent containin...

Embodiment 3

[0052] A soil remediation agent for fixing heavy metal elements in polluted soil, the solid powder granular soil remediation agent consists of a soil heavy metal chemical fixative component (A), a soil heavy metal adsorbent component (B), a soil conditioner component ( C) Mixed evenly. in:

[0053] The soil heavy metal chemical fixative (A) is prepared by mixing 66.7% of thiourea, 6.6% of sodium sulfide and 26.7% of sulfur.

[0054] The soil heavy metal adsorbent (B) is prepared by mixing 50% of expanded vermiculite and 50% of natural zeolite.

[0055] Soil conditioner (C) is trisodium phosphate.

[0056] Soil heavy metal chemical fixing agent (A) 50%, soil heavy metal adsorbent (B) 10%, soil conditioner (C) 40% mix and make the powder granular soil remediation agent 100kg that is used for fixing heavy metal in polluted soil.

[0057] 100kg of the above-mentioned solid powder granular soil remediation agent and 35.6 tons (dry basis) containing cadmium, zinc total amount are...

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Abstract

The invention relates to a soil repairing agent used for fixing heavy metal element in polluted soil, a preparation method and an application thereof. The soil repairing agent is a solid granular product, and is prepared by uniformly mixing a soil heavy metal chemical fixing agent ingredient (A), a soil heavy metal adsorbent ingredient (B) and a soil conditioner ingredient (C); according to the mass percentage, the soil heavy metal chemical fixing agent (A) content in the soil repairing agent composition is 20-80%, soil heavy metal adsorbent (B) content is 10-20%, and soil conditioner (C) content is 10-60%. The soil repairing agent can be directly and mutually mixed with the soil polluted by the heavy metal element and then is placed, or the soil repairing agent is dispersed or dissolved in water, then is uniformly stirred and mixed by the soil polluted by the heavy metal element and is placed, so that heavy metal element can be fixed, and heavy metal fixing rate can reach more than 95%. Transportable concentration of the heavy metal element in soil can be greately reduced, soil heavy metal pollution problem can be effectively solved, and polluted soil can be treated and restored finally.

Description

technical field [0001] The invention relates to a soil remediation agent for fixing heavy metal elements in polluted soil, a preparation method and application thereof. Specifically, it relates to a preparation method and application of a soil remediation agent for fixing heavy metal elements in polluted soil and can greatly reduce the mobile concentration of heavy metal elements in soil. Background technique [0002] The heavy metals that pollute the soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity, as well as zinc (Zn) and copper with certain toxicity. (Cu), nickel (Ni) and other elements. Mainly from industrial and mining enterprises waste residue, waste water, sludge, pesticides and soot atmospheric deposition. [0003] Heavy metal pollutants have little mobility in the soil and are not degraded by microorganisms. After entering the human body through the food cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08A62D3/33A62D101/43
CPCA62D3/33A62D2101/43B09C1/08C09K17/40C09K2101/00
Inventor 曹卫宇陈明良何佩华卢啸旸邹晓岱张伟陈国华
Owner SHANGHAI RES INST OF CHEM IND
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