Garbage incineration ash slag heavy metal solidifying method

Abstract

The invention discloses a garbage incineration ash slag heavy metal solidifying method, and belongs to the field of solid waste disposal and resource utilization. The method comprises the following steps of obtaining waste sundry metal and fine bottom slag after sorting and crushing of the garbage incineration ash slag; using the waste sundry metal for metal regeneration; performing mixing, fusingand water quenching on the bottom fine slag with the garbage incineration ash slag; using the water quenching slag for cement and crystallized glass, wherein the heavy metal in the product is lower than the limit value of Identification Standards for Hazardous Wastes-Identification for Extraction Toxicity (GB 5085.3-2007). The method provided by the invention has the advantages that the process is simple; the industrialization is easy; the goals of safely solidifying garbage incineration ash slag heavy metal and recycling the garbage incineration ash slag heavy metal for cement and crystallized glass can be achieved.

Description

technical field [0001] The invention belongs to the field of solid waste disposal and resource utilization, and in particular relates to a method for solidifying heavy metals in garbage incineration ash. Background technique [0002] In 2017, the volume of domestic waste removal in my country reached 236 million tons, which continued to increase at a rate of about 10% per year. Waste incineration treatment has the ability to quickly reduce volume, reduce volume, and eliminate harm, and the treatment rate can reach 40%. Bottom slag accounts for about 25% to 30% of the weight of garbage, and fly ash accounts for about 3% to 5%. Because fly ash contains a certain amount of harmful substances, especially heavy metals such as Cr, Pb, Cd, Ni, Zn and Cu, it belongs to HW18 hazardous solid waste, and it must be solidified / stabilized before the processed product can be filled. Burial and resource utilization. Although the amount of heavy metals leached from the bottom slag basically...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: large amount of wastewater treatment, high energy consumption for soluble salt recovery, excessive heavy metal content in the prepared permeable bricks, and high risk of heavy metal pollution

[0007] In summary, the existing solidification methods for heavy metals in waste incineration ash have problems such as low resource utilization value, high risk of heavy metal secondary pollution, and large amount of wastewater treatment.

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