Resource recycling method of construction waste and repairing agent for heavy-metal-polluted soil

Abstract

The invention provides a repairing agent for heavy-metal-polluted soil and a resource recycling method of construction waste. The soil repairing agent comprises 40-60% of a construction waste treatment material, 10-20% of silica sol, 5-10% of humic acid and 10-45% of metallothionein; the construction waste treatment material is prepared through the following steps that the construction waste is broken into powder and then screened by a 1200-mesh molecular screen, a citric acid water solution is added and then stirring is conducted for one hour or more, then calcium polysulfide is added and then stirring is conducted for four hours or more, after a mixed solution is screened by the 1200-mesh molecular screen, still standing is conducted to subside, water is pumped out, sediments are dried, and after grinding, the construction waste treatment material is prepared. According to the repairing agent of the heavy-metal-polluted soil and the resource recycling method of the construction waste, resource recycling of the construction waste is achieved for the first time, and on the one hand, environment pollution can be effectively reduced, and waste treatment cost can be effectively lowered; and on the other hand, preparing cost of the prepared construction waste treatment material is remarkably lowered, the repairing property cannot be lowered, or the repairing time cannot be prolonged.

Description

technical field [0001] The invention relates to the field of construction waste treatment and soil remediation, in particular to a method for preparing a heavy metal-contaminated soil remediation agent using construction waste and the prepared metal-contaminated soil remediation agent. Background technique [0002] Soil pollution has become a worldwide problem, and heavy metal pollution has become the "invisible killer" of my country's agricultural products. With the advancement of urbanization in China, chemical pollution has become a major source of pollution. Benzene, phenol, phosphorus organic matter and heavy metals such as cadmium, lead, mercury, and arsenic are seriously polluted. Excessive use of chemical fertilizers will cause soil acidification, which in turn will induce an increase in the activity of heavy metal ions in the soil. Every time the soil pH value drops by one unit, the activity of heavy metal cadmium will increase by 100 times, which will increase th...

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Problems solved by technology

Although this method can obtain a repairing agent with excellent repairing ability, high-temperature calcination is required to prepare modified medical stone, and the cost is relatively high and the operation is complicated.

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