Passivator for repairing agricultural soil polluted by heavy metal chromium and preparation method thereof

A technology for contaminated soil and heavy metals, applied in the field of contaminated soil remediation, can solve the problems of difficult wide application, soil fertility damage, poor stabilization effect, etc., achieve high practical value, improve adsorption performance, and prevent agglomeration

Inactive Publication Date: 2019-11-22
南京迪天高新产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, many scholars have devoted themselves to the research of passivating agents for heavy metal chromium in repairing agricultural land polluted soil. Various types of heavy metal chromium passivating agents have also appeared on the market. Long-term use, it changes the original soil structure to a certain extent, causing damage to the original soil fertility, inhibiting soil microorganisms or plant growth, and there are also problems such as secondary pollution
[0005] Although there have been studies on natural stabilizers in the prior art, the natural stabilizers in the prior art have the disadvantage of poor stabilizing effect, and are difficult to be popularized and applied on a large scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A passivator for repairing agricultural land polluted soil heavy metal chromium, comprising the following components by weight:

[0034] 10 parts of calcium polysulfide, 5 parts of potassium sulfide, 4 parts of dipotassium hydrogen phosphate, 3 parts of sodium lignosulfonate, 3 parts of potassium humate, 2 parts of attapulgite, and 1 part of quicklime.

[0035] The attapulgite is iron-loaded modified attapulgite, and the preparation method is as follows:

[0036] (1) Acidification purification: add attapulgite in the hydrochloric acid solution of 5mol / L, mechanically stir, acidify 15min, then rinse repeatedly with deionized water until no chloride ion remains, obtain acidification attapulgite for subsequent use;

[0037] (2) Surface activation: add a cationic surfactant in deionized water, mix evenly, then add the acidified attapulgite obtained in step 1, and mechanically stir for 15-30min to obtain a surface-activated attapulgite solution for subsequent use;

[0038] (3...

Embodiment 2

[0054] A passivator for repairing heavy metal chromium in agricultural land polluted soil, comprising the following components by weight: 1 part of calcium polysulfide, 1 part of potassium sulfide, 1 part of dipotassium hydrogen phosphate, 1 part of sodium lignosulfonate, humic acid Potassium acid 2 parts, attapulgite 1 part, quicklime 3 parts.

[0055] The attapulgite is iron-loaded modified attapulgite, and the preparation method is as follows:

[0056] (1) acidification purification: add attapulgite in the hydrochloric acid solution of 5mol / L, mechanically stir, acidify 30min, then rinse repeatedly with deionized water until no chloride ion remains, obtain acidification attapulgite for subsequent use;

[0057] (2) Surface activation: add a cationic surfactant to deionized water, mix well, then add the acidified attapulgite obtained in step 1, and mechanically stir for 30 minutes to obtain a surface-activated attapulgite solution for subsequent use;

[0058] (3) Iron-carryi...

Embodiment 3

[0072] A passivator for repairing heavy metal chromium in polluted agricultural land soil, comprising the following components by weight: 5 parts of calcium polysulfide, 4 parts of potassium sulfide, 3 parts of dipotassium hydrogen phosphate, 2 parts of sodium lignosulfonate, humic acid 3 parts of potassium phosphate, 5 parts of attapulgite, and 2 parts of quicklime.

[0073] The attapulgite is iron-loaded modified attapulgite, and the preparation method is as follows:

[0074] (1) Acidification purification: add attapulgite in the hydrochloric acid solution of 5mol / L, mechanically stir, acidify 20min, then repeatedly rinse with deionized water until no chloride ion remains, obtain acidification attapulgite for subsequent use;

[0075] (2) Surface activation: add a cationic surfactant in deionized water, mix evenly, then add the acidified attapulgite obtained in step 1, and mechanically stir for 20 minutes to obtain a surface-activated attapulgite solution for subsequent use; ...

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PUM

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Abstract

The invention belongs to the technical field of contaminated soil remediation, and particularly relates to a passivator for repairing agricultural soil polluted by heavy metal chromium, wherein the passivator comprises the following components in parts by weight: 1-10 parts of calcium polysulfide, 1-5 parts of potassium sulfide, 1-5 parts of dipotassium phosphate, 1-3 parts of sodium lignin sulfonate, 2-4 parts of potassium humate, 1-5 parts of attapulgite and 1-3 parts of quick lime. The chemical modified passivator and the modified natural passivator are compounded into the multi-element efficient chromium passivator, so that the multi-element efficient chromium passivator is suitable for chromium compound stabilization, heavy metal chromium polluted land is repaired into fertile farmland, and the multi-element efficient chromium passivator has high practical value and wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil, and in particular relates to a passivator for remediating heavy metal chromium in agricultural land polluted soil and a preparation method thereof. Background technique [0002] With the development of industrial activities such as chromium salt production, metal processing, electroplating, and tanning, chromium has continuously entered the soil environment and been continuously enriched through irregular discharge of pollutants containing heavy metal chromium or other channels. Especially due to sewage irrigation, sedimentation of chromium-containing dust, waste residue discharged from industrial sectors, etc., a large amount of chromium-containing pollutants will eventually enter the soil environment, thereby changing the microbial system in the soil, inhibiting plant growth, and can be enriched through the food chain effect, affecting human health. Chromium mainly exists ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 汪一潭秦丰林王帘里
Owner 南京迪天高新产业技术研究院有限公司
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