Heavy metal contaminated soil curing agent and preparation method and application thereof

A technology for polluted soil and heavy metals, applied in the field of soil remediation, can solve the problems of high price of chemical remediation agents, consumption of natural resources, and general remediation effect, and achieve the effects of remediating heavy metal pollution, high unconfined compressive strength, and reducing costs.

Inactive Publication Date: 2021-02-02
MCC BAOSTEEL TECH SERVICE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Commonly used physical restoration materials such as attapulgite, seaweed, and zeolite can restore heavy metals in soil, but they belong to ores, and their use in repairing heavy metal-contaminated soil will lead to the consumption of natural resources, while other physical restoration materials such as fly ash and slag, The restoration effect is average; in addition, the chemical restoration agent has the problems of high price and easy to cause secondary pollution

Method used

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  • Heavy metal contaminated soil curing agent and preparation method and application thereof
  • Heavy metal contaminated soil curing agent and preparation method and application thereof
  • Heavy metal contaminated soil curing agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, steel slag and slag were mixed at a weight ratio of 40:60, acidified with phosphoric acid for 24 hours, and the amount of phosphoric acid added was 3.2% of the total weight of steel slag and slag to obtain heavy metal contaminated soil curing agent 1#.

[0030] Mix the heavy metal contaminated soil curing agent 1# with the heavy metal contaminated soil according to the mass ratio of 25:100, then add water, the mass ratio of water and heavy metal contaminated soil curing agent is 1:3, stir, natural conservation for 28 days, test the curing rate and Unconfined compressive strength.

[0031] The results obtained are as follows:

[0032] technical indicators Ni 2+

Embodiment 2

[0034] In this example, steel slag and slag were mixed according to the weight ratio of 28:72, acidified with phosphoric acid for 22 hours, and the amount of phosphoric acid added was 2.2% of the total weight of steel slag and slag, and heavy metal contaminated soil curing agent 2# was obtained.

[0035] Mix the heavy metal contaminated soil curing agent 2# with the heavy metal contaminated soil according to the mass ratio of 22:100, then add water, the mass ratio of water and heavy metal contaminated soil curing agent is 1:2, stir, natural conservation for 28 days, test the curing rate and Unconfined compressive strength.

[0036] The results obtained are as follows:

[0037]

[0038]

Embodiment 3

[0040] In this example, steel slag and slag were mixed according to the weight ratio of 72:28, acidified with phosphoric acid for 26 hours, and the amount of phosphoric acid added was 4.8% of the total weight of steel slag and slag, and heavy metal contaminated soil solidification agent 3# was obtained.

[0041] Mix the heavy metal contaminated soil curing agent 3# with the heavy metal contaminated soil according to the mass ratio of 20:100, then add water, the mass ratio of water and heavy metal contaminated soil curing agent is 1:4, stir, natural conservation for 28 days, test the curing rate and Unconfined compressive strength.

[0042] The results obtained are as follows:

[0043] technical indicators Ni 2+

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Abstract

The invention belongs to the technical field of soil remediation, and relates to a heavy metal contaminated soil curing agent and a preparation method and application thereof. The preparation method of the heavy metal contaminated soil curing agent comprises the following steps: mixing steel slag and mineral slag, then carrying out phosphorylation treatment, and drying to obtain the heavy metal contaminated soil curing agent. The raw materials of the heavy metal contaminated soil curing agent are taken from waste steel slag and mineral slag, after phosphoric acid acidification treatment, the heavy metal contaminated soil curing agent has a very excellent treatment effect on tin, copper, zinc, lead and other heavy metal pollutants in contaminated soil, the leaching toxicity of heavy metal in the soil can be effectively reduced, and the purpose of remediating heavy metal contaminated soil is achieved. According to the invention, waste steel slag and slag are used as raw materials so thatwaste is turned into wealth, the purpose of treating waste with waste is achieved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a solidifying agent for heavy metal polluted soil, a preparation method and application thereof. Background technique [0002] Soil heavy metal pollution has become one of the main environmental pollution problems in China. Scholars at home and abroad have studied many soil remediation technologies, such as physical remediation technology, chemical remediation technology, physical and chemical remediation technology and phytoremediation technology. At present, solidification and stabilization technology is the most widely used in physical and chemical repair technology, and many repair materials have been developed, such as attapulgite, seaweed, zeolite and so on. The solidification and stabilization technology is to mix heavy metal-contaminated soil with a solidifying agent in a certain proportion, and after a certain period of time to mature, a solid mixtur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02C09K17/04B09C1/08B09C1/00
CPCC09K17/02C09K17/04B09C1/08B09C1/00
Inventor 杨刚王文君金强颜凡于纵达
Owner MCC BAOSTEEL TECH SERVICE
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