Method for repairing heavy metal pollution tailings with charcoal-based slow release fertilizer and imperata cylindrica

Abstract

The invention discloses a method for repairing heavy metal pollution tailings with charcoal-based slow release fertilizer and imperata cylindrica. The method includes the following steps that according to the mass ratio, 1-5 parts of charcoal, 100 parts of polyurethane emulsion with the concentration being 40%-50%, 5-10 parts of starch and 150-300 parts of distilled water are mixed to prepare a coating solution; 40-60 parts of composite organic fertilizer particles are suspended into 10-20 parts of the prepared coating solution, and slow release coating treatment is conducted to obtain the charcoal-based slow release fertilizer; the prepared charcoal-based slow release fertilizer is mixed with the heavy metal pollution tailings; and the imperata cylindrica is planted into the tailings containing the charcoal-based slow release fertilizer. By the adoption of the method, the treating effect of the heavy metal pollution tailings is good, the method is environmentally friendly, cost is low, and pollution is small; and heavy metal pollution is reduced, and meanwhile cycling utilization of recourses and lasting effect playing of fertilizer nutrients can be achieved.

Description

technical field

[0001] The invention relates to a method for repairing tailings polluted by heavy metals with biochar-based slow-release fertilizer and imperina imperata. Background technique

[0002] Mineral resources are non-renewable resources that human beings rely on for survival, providing us with a rich material basis. During the mining process of metal mines, after mechanical crushing and grinding, the valuable minerals are screened, and the solid residue waste discharged is tailings. According to statistics, the total reserves of tailings in my country are about 8 billion tons, and it is growing rapidly at a rate of 10% every year. Under the action of natural weathering, rainwater flushing and biological factors, long-term exposed tailings release harmful heavy metal elements, toxic residual flotation agents and acid wastewater caused by sulfur-containing minerals in waste rocks, which have a negative impact on the soil and surface water around the mining area. An...