Remediation agent for heavy metal polluted soil in mining area and preparation method thereof

Abstract

The invention discloses a remediation agent for heavy metal contaminated soil of a mining area and a preparation method of the remediation agent. The remediation agent is prepared from ceramic powder, a biomass carbon material, a phosphate-containing material, silicon micropowder, organic fertilizer and calcium oxide and / or calcium hydroxide, wherein the ceramic powder is prepared from discarded ceramic filter elements of water purifiers through the steps of acid soaking, flushing and grinding, and the biomass carbon material is prepared from wood residues, straw and dry branches and fallen leaves through anoxic high-temperature burning. The powder prepared from the ceramic filter elements is large in specific surface area, is provided with functional groups on the surface, has high adsorptivity, caking property, suspension property and cation exchange capacity and has a good binding effect on heavy metal cations in the soil; the biomass carbon material can effectively bind heavy metal and achieve complexing of the heavy metal on the surface groups and inside pore channels; the organic fertilizer can provide nutritional elements and can further achieve complexing of the heavy metal elements; the remediation agent is low in cost and can stabilize and passivate the heavy metal and can further supplement the fertility of the soil.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a remediation agent for heavy metal-contaminated soil in mining areas and a preparation method thereof. Background technique [0002] my country is the third largest mining country in the world. The development of mineral resources has promoted economic prosperity, social progress and human civilization. However, due to the lack of establishment and implementation of the corresponding legal system for the protection and governance of the mine ecological environment, the development of mineral resources is separated from environmental protection, and mining companies only focus on economic benefits and ignore the ecological environment, resulting in a large number of mine environmental problems. One of the most serious problems is the heavy metal pollution in the soil. Many soil pollution phenomena have appeared in Hunan, Guangxi and other pla...

AI Technical Summary

Problems solved by technology

Although the stabilization and remediation technology started relatively late in China, judging from the current soil remediation and treatment technology market, stabilization technology is expected to become the main force in the field of soil heavy metal pollution remediation technology, but the cost of remediation agents for heavy metal contaminated soil in mining areas is very high , the cost of treating large-scale contaminated soil is too high, it is difficult to popularize and apply, and after the treatment, the soil in the mining area still suffers from serious lack of nutrition or nutritional imbalance. It is difficult for plants to grow and survive, and it is still barren after treatment.