A kind of cement solidification method of mixed incineration waste residue

Abstract

The invention discloses a cement solidification method of mixed incineration waste residue, comprising the following steps: (1) taking a certain quality of mixed incineration waste residue, adding oxidant and water, stirring for a certain period of time, then adding a stabilizer, and continuing to stir for a certain period of time; (2) ) respectively adding several parts of fly ash and bis-trimethylsilyl hydrogen phosphate to the mixed slurry obtained in step (1), and stirring for a certain period of time; (3) adding several parts to the mixed slurry obtained in step (2) Portland cement, sodium lignosulfonate, biomass-based solid acid and glass fiber, then add an appropriate amount of water, stir until uniform, and leave it at room temperature for a certain period of time to obtain a solidified body; (4) Take water to pour the solidified body The leaching rate of the solidified heavy metals prepared by this solidification method is low, which meets the limit of the hazardous wastes allowed to enter the landfill area stipulated in the "Landfill Pollution Control Standards for Hazardous Wastes", and realizes the centralized treatment of mixed incineration waste residues. Significance.

Description

technical field [0001] The invention relates to the field of incineration waste residue treatment, in particular to a cement solidification method for mixing incineration waste residue. Background technique [0002] Incineration treatment of hazardous wastes can not only reduce the volume of hazardous wastes in the environment, but also transform and reduce the harmful components in hazardous wastes. It is a method commonly used at home and abroad to treat hazardous wastes. However, the incineration of hazardous waste may produce a series of secondary pollution, such as smoke, nitrogen oxides, sulfur oxides, and incineration residues generated during the incineration process. Cement solidification of hazardous waste incineration residues is a common method for treating hazardous waste incineration residues at home and abroad. [0003] In accordance with national standards, a class of wastes identified that have at least one of the five hazardous characteristics of corrosive...

AI Technical Summary

Problems solved by technology

For example, due to the different components of cement solidified waste residue, it is necessary to reasonably adjust the composition of the curing agent, otherwise the solidified body will have low curing strength, causing the solidified body to collapse twice under certain circumstances, such as high pressure, resulting in pollution. secondary diffusion

Because there are often some heavy metal residues in the incineration waste residue, there is a problem of heavy metal leaching during the stacking of solidified bodies

In addition, because the cement curing method needs to use a large amount of cement for curing, the cement has a large alkalinity, and some alkaline additives are often added to the cement curing additives to treat heavy metals, which often leads to the alkalinity of the leachate of the waste residue exceeding the standard, which does not meet the requirements. Corresponding waste landfill standard "Hazardous Waste Landfill Pollution Control Standard (GB18598-2001)"

For cement curing additives, the composite additives currently used are usually added at one time, which has a certain impact on the effective function of the additive.