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

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...

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.

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