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Humic acid type soil heavy metal remediation agent and preparation method and application thereof

A technology of heavy metals and remediation agents, applied in the restoration of contaminated soil, application, soil conditioning materials, etc., can solve the problems of difficulty in obtaining organic fertilizers and quicklime, reduce heavy metal absorption, and reduce organic matter content, so as to increase soil organic matter content and Cation exchange capacity, reduced environmental and human health risks, reduced toxicity and bioavailability effects

Active Publication Date: 2018-08-03
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The third is the soil chemical conditioning technology including the application of organic fertilizers and quicklime, soaking in water, and the use of adsorbents, passivators, and antagonists. , in order to reduce the bioavailability of heavy metals in the soil, reduce the absorption of heavy metals by crops, and promote the content of heavy metals in agricultural products to meet the national quality and safety standards. Problems such as low efficiency of gleization and "adsorption-passivation-antagonism" of heavy metals, deviation of stability and secondary pollution
[0010] The following problems exist in the existing heavy metal soil remediation technology: in the preparation process of the heavy metal stabilizer, some minerals are used more, which will cause the soil to harden after remediation, and the organic matter content will also be greatly reduced. In the end, the original value of the soil will disappear, and the actual use of the restored soil will be greatly limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of preparation method of humic acid soil heavy metal restoration agent:

[0035] (1) mix. Mix 30g of humic acid, 40g of water, 0.5g of polyacryl alcohol, 5g of hydroxypropyl methylcellulose, and 0.5g of calcium carbonate to obtain a mixture.

[0036](2) Forming. The mixture obtained in (1) was fully mixed for 2 hours at a temperature of 80° C. and then extruded to obtain 2 cm shaped particles.

[0037] (3) dry. The granules formed in (2) were dried at 105° C. for 12 hours to obtain dry granules.

[0038] (4) Make holes. The dried particles in (3) were calcined at a temperature of 250° C. for 4 hours in an inert atmosphere to obtain a porous humic acid composite material.

[0039] (5) ADD. Combine 15g of the porous humic acid composite obtained in (4) with 3g of hydroxyapatite, 2g of γ-Al 2 o 3 , 4g quicklime, 5g fly ash, and 5g attapulgite are mixed to obtain the humic acid soil heavy metal restoration agent of the present invention.

[0040] The followi...

Embodiment 2

[0042] A kind of preparation method of humic acid soil heavy metal restoration agent:

[0043] (1) mix. Mix 15g of humic acid, 30g of water, 1g of polyacryl alcohol, 10g of hydroxypropyl methylcellulose, and 0.5g of calcium carbonate to obtain a mixture.

[0044] (2) Forming. The mixture obtained in (1) was fully mixed for 2 hours at a temperature of 80° C. and then extruded to obtain 2 cm shaped particles.

[0045] (3) dry. The granules formed in (2) were dried at 105° C. for 12 hours to obtain dry granules.

[0046] (4) Make holes. The dried particles in (3) were calcined at 200° C. for 4 hours in an inert atmosphere to obtain a porous humic acid composite material.

[0047] (5) ADD. Combine 15g of the porous humic acid composite obtained in (4) with 3g of hydroxyapatite, 2g of γ-Al 2 o 3 , 4g quicklime, 5g fly ash, and 5g attapulgite are mixed to obtain the humic acid soil heavy metal restoration agent of the present invention.

[0048] The following is a further o...

Embodiment 3

[0050] A kind of preparation method of humic acid soil heavy metal restoration agent:

[0051] (1) mix. Mix 25g of humic acid, 40g of water, 0.5g of polyacryl alcohol, 10g of hydroxypropyl methylcellulose, and 0.5g of calcium carbonate to obtain a mixture.

[0052] (2) Forming. The mixture obtained in (1) was fully mixed for 2 hours at a temperature of 80° C. and then extruded to obtain 2 cm shaped particles.

[0053] (3) dry. The granules formed in (2) were dried at 105° C. for 12 hours to obtain dry granules.

[0054] (4) Make holes. The dried particles in (3) were calcined at a temperature of 250° C. for 4 hours in an inert atmosphere to obtain a porous humic acid composite material.

[0055] (5) ADD. Combine 15g of the porous humic acid composite obtained in (4) with 3g of hydroxyapatite, 2g of γ-Al 2 o 3 , 4g quicklime, 5g fly ash, and 5g attapulgite are mixed to obtain the humic acid soil heavy metal restoration agent of the present invention.

[0056] The follo...

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Abstract

The invention provides a humic acid type soil heavy metal remediation agent and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing; (2) molding; (3) drying; (4) pore forming; and (5) adding. On the premise of considering the use value after soil remediation, the soil heavy metal remediation agent is prepared and has an obvious removal effect on all representative soil heavy metal pollution ions.

Description

technical field [0001] The invention relates to the technical field of treatment and restoration of heavy metal polluted soil, in particular to a green humic acid conditioner for heavy metal polluted soil restoration. Background technique [0002] With the rapid development of modern economy and the rapid expansion of urban scale, harmful heavy metals enter the soil through various channels, causing serious soil pollution. Soil heavy metal pollution will not only lead to soil degradation, affect the yield and quality of crops, but also pollute surface water and groundwater through runoff and leaching, endangering human health. Soil heavy metal pollution has attracted great attention from all walks of life. According to the European Communities Bureau of Reference, there are four main forms of soil heavy metal elements: exchangeable and carbonate-bound state (acid-soluble state), iron (Fe) / manganese (Mn) oxide-bound state ( Reducible state), organic and sulfide combined sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 周剑林冯涛刘伟银陈章陈国梁李志贤陈远其
Owner HUNAN UNIV OF SCI & TECH
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