Preparation method and use method of agentia for stabilization repairing of mercury-contaminated soil

Abstract

The invention discloses a preparation method and a use method of agentia for stabilization repairing of mercury-contaminated soil. The preparation method includes the steps that 1, contaminated soil is excavated, screened and crushed; 2, the water content, pH value, redox potential value and initial concentration of mercury in the soil are measured by sampling analysis; and 3, the ratio of components in the agentia is determined, and materials in the components are crushed and mixed evenly. The agentia includes a component A and a component B, the component A includes calcium oxide and zero-valent iron powder, and the component B includes sodium sulfide, triple superphosphate, montmorillonite powder, zeolite powder and ferrous sulfate. The invention further provides the use method of the agentia for stabilization repairing of the mercury-contaminated soil. According to the preparation method and the use method, the mechanisms of 'coarse stabilization' and 'fine stabilization' are combined, he preparation method and the use method are suitable for a variety of soil environments, the agentia is flexibly used, the configuration method is simple, field service is convenient, and the cost can be further saved.

Description

technical field [0001] The invention relates to a method for preparing and using a soil remediation agent, in particular to a method for preparing and using a chemical agent for stabilizing and repairing heavy metal mercury polluted soil. Background technique [0002] my country is one of the countries that are still mining mercury mines, and the situation of mercury pollution is severe. In the 1970s, incidents of mercury pollution occurred in the Songhua River Basin in Northeast China and in Jixian County, Hebei Province. Gold mining in Wanshan and Wuchuan, Guizhou provinces resulted in high-concentration mercury-contaminated soils that are still present today. According to the literature, the background value of mercury in the soil environment in my country is about 0.065 mg / kg, and the "National Soil Pollution Survey Bulletin (2014)" shows that the point-exceeding rate of mercury in soil in my country is 1.6%. The current sources of mercury pollution in my country mainly...

AI Technical Summary

Problems solved by technology

Conventional mercury-contaminated soil stabilization and remediation agents are basically clay minerals, which mainly stabilize mercury in the soil through adsorption. However, such agents generally have the problems of large doses of agents and long-term stabilization effects.

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