A curing agent for heavy metal polluted soil and its preparation and application method

Abstract

The invention discloses a curing agent for heavy metal pollution soil, and preparation and application methods thereof. The curing agent is prepared from the following materials in percentage by mass: 30 to 55 percent of steel slag powder, 20 to 50 percent of quicklime powder and 5 to 30 percent phosphate-loaded charcoal. The curing agent has the advantages that firstly, the curing agent can obviously reduce the heavy metal mobility and the toxicity leaching quantity in the heavy metal polluted soil, and is particularly applicable to acid pollution sites with the high heavy metal content and various contaminant types; after the polluted soil restoration, the curing agent can be used as environment-friendly materials to realize the resource utilization; the environment risk of the pollution sites in the secondary development and utilization can be obviously reduced; meanwhile, 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 in a large range and can be applied to the curing stabilization restoration of the composite pollution sites.

Description

technical field [0001] The invention relates to the field of environmental geotechnical engineering, in particular to a curing agent for heavy metal polluted soil and a preparation and application method. Background technique [0002] With the adjustment of urban functions and urban layout in our country, enterprises originally located in urban centers and suburbs, such as chemical plants, metal smelting plants, and electroplating plants, have gradually shut down or retreated from cities to parks. However, the production process of industries and enterprises for many years , A large amount of pollutants have accumulated in the land left after their relocation, which not only brings resistance to the efficient use of the leftover land, but also brings serious safety hazards to the surrounding environment. In recent years, the "Soil Pollution Prevention and Control Action Plan" (Soil Ten Articles) promulgated by the government also regards the restoration of contaminated soil ...

AI Technical Summary

Problems solved by technology

Commonly used curing agents mainly include materials such as cement, lime, and phosphate, which have a good effect on the solidification and stabilization of heavy metals, but there are also a large number of disadvantages, such as high energy consumption for cement production and high greenhouse gas emissions; lime and phosphate are Non-renewable natural minerals, high cost, etc.; and a large amount of phosphate will seriously change the soil structure and further cause phosphorus pollution of groundwater and surface water

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