Curing agent for compounding heavy metal pollution soil as well as preparation method and application method thereof

A technology of heavy metal polluted soil and its application method, which is applied in the fields of environmental engineering, civil engineering, and environmental geotechnical engineering, can solve the problems of serious pollution, high cost, and large energy consumption, and achieve good durability, enhanced stability, and reduced contact Effect

Inactive Publication Date: 2018-03-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used curing agents mainly include materials such as cement and phosphate rock powder, which have a good effect on the solidification and stabilization of heavy metals, but there are disadvantages such as large energy consumption, serious pollution, and high cost in the production process.

Method used

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  • Curing agent for compounding heavy metal pollution soil as well as preparation method and application method thereof

Examples

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Effect test

preparation example Construction

[0032] The steel slag powder of the above curing agent is prepared by the following method: crush the water-quenched converter and pass through a 2mm sieve, place the sieved steel slag powder in an oven, and dry it by airflow at a temperature of 100-150°C to make it The water content is lower than 2%, then ground and passed through a 200-mesh sieve, and then calcined in an electric furnace at 500-700°C for 1-2 hours to obtain steel slag powder.

[0033] The potassium dihydrogen phosphate powder of the above-mentioned curing agent is prepared by the following method: put the industrial-grade potassium dihydrogen phosphate in an oven, and dry it by airflow at a temperature of 100-150°C to make the moisture content lower than 2%, and grind And pass through a 0.075mm sieve to obtain potassium dihydrogen phosphate powder.

[0034] The preparation method of the curing agent for the restoration of heavy metal-contaminated sites includes the following steps:

[0035] 1) Mix lime powd...

Embodiment 1

[0057] Mix and stir the prepared curing agent with the composite heavy metal-contaminated soil sample in test material 1), wherein the dosage of the curing agent is 5% (accounting for the dry weight of the composite metal-contaminated soil), and the moisture content of the prepared sample is controlled at 20 ± 2 %, after stirring evenly, adopt the static pressure method to prepare a columnar sample with a diameter of 5cm and a height of 10cm, wrap it tightly with a fresh-keeping bag, and preserve it for 28 days at 20°C and humidity >95%.

Embodiment 2

[0059] Same as the sample preparation process and curing process of embodiment 1, difference is, the dosage of curing agent is 10% (curing agent accounts for heavy metal and organic matter compound polluted soil dry weight).

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Abstract

The invention provides a curing agent for compounding heavy metal pollution soil, and preparation method and application method thereof. The material is prepared from 10 to 30 mass percent of pulverized lime, 20 to 50 mass percent of fly ash, 30 to 50 mass percent of activated steel slag powder and 0.5 to 2 mass percent of monopotassium phosphate powder. The curing agent has the advantages that the heavy metal migratory performance and the toxicity extracting quantity in the heavy metal pollution soil can be obviously reduced; the curing agent is particularly applicable to acid pollution fields with high heavy metal contents and many contaminant types; after the pollution soil restoration, the curing agent can realize the resource utilization through being used as an environment-friendly material; the environment risk in the secondary development utilization of the pollution fields can be obviously reduced; meanwhile, the preparation steps and the application method of the curing agentare also provided; the raw materials of the curing agent can be easily obtained; the cost is low; the preparation is simple; the use is convenient; the effect is stable; the curing agent can be popularized and applied to heavy metal curing stabilization restoration of the composite pollution field in a large scale.

Description

technical field [0001] The invention belongs to the technical fields of civil engineering, environmental engineering and environmental geotechnical engineering, and specifically relates to a curing agent for remediation of composite heavy metal polluted sites and a preparation and application method. Background technique [0002] Heavy metal pollution in industrially polluted sites is characterized by complex types of heavy metals, high acidity, and high content. In the remediation process of heavy metal-contaminated sites, solidification stabilization technology is widely used. Solidification and stabilization technology is to fully mix the solidification agent and heavy metal-contaminated soil evenly, and achieve the purpose of sealing pollutants and reducing environmental risks through physical packaging, chemical adsorption and crystallization and precipitation. Commonly used curing agents mainly include materials such as cement and phosphate rock powder, which have a g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B18/08C04B18/14C04B22/16C09K17/12C09K109/00
CPCC04B18/08C04B18/142C04B22/16C04B28/10C04B2111/00732C09K17/12C09K2109/00Y02W30/91
Inventor 张黎明杜延军魏明俐金飞周实际
Owner SOUTHEAST UNIV
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