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A kind of cement solidification method of mixed incineration waste residue

A cement solidification and waste residue technology, which can be used in solid waste management, sustainable waste treatment, climate sustainability, etc. Effect

Active Publication Date: 2021-06-04
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A cement solidification method for mixing incineration waste slag, comprising the following steps:

[0022] (1) According to the number of parts by mass, take 100 parts of mixed incineration waste residue, add 1 part of potassium permanganate, add 100 parts of water, stir for 5-20 minutes, then add 5 parts of sodium thiosulfate, and continue stirring for 20 minutes;

[0023] (2) Continue to add 20 parts of fly ash and 2 parts of bistrimethylsilyl hydrogen phosphate to the mixed slurry obtained in step (1), and stir for 5-10 minutes;

[0024] (3) Add 30 parts of Portland cement, 5 parts of sodium lignosulfonate, 10 parts of biomass-based solid acid with an acid site of 0.5 mol / g and 8 parts of glass fiber to the mixed slurry obtained in step (2). part, then add 50 parts of water, stir until uniform, and place it at room temperature for 10 hours to obtain a cured body;

[0025] (4) Take water according to 10% of the weight of the solidified body to carry out pouring main...

Embodiment 2

[0029] Refer to the steps in Example 1 to solidify the mixed incineration waste residue. The difference is that the oxidant in step (1) uses 2 parts of ammonium persulfate, and the acid site of biomass solid acid in step (3) is 1.3 mol / g.

[0030] After solidification by the method in Example 2, the original leaching value of each metal in the leach solution meets the control limit for hazardous wastes allowed to enter the landfill specified in the "Hazardous Waste Landfill Pollution Control Standard (GB18598-2001)", wherein the leaching of pH The value is 9.

Embodiment 3

[0032] The mixed incineration waste residue was solidified with reference to the steps in Example 1, except that the amount of glass fiber added in step (3) was 12 parts.

[0033] After solidification by the method in Example 3, the original leaching value of each metal in the leach solution meets the control limit for hazardous wastes allowed to enter the landfill specified in the "Hazardous Waste Landfill Pollution Control Standard (GB18598-2001)", wherein the leaching of pH The value is 10. Compared with Example 1, the strength of the cured body in this example has been improved by 23%, which can meet the landfill requirements of the landfill.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/02C04B18/10
CPCC04B20/023C04B28/04C04B2111/00784C04B18/10C04B24/42C04B18/08C04B24/18C04B14/42C04B2103/0094Y02W30/91
Inventor 潘先群金杰汪平生黄奕航俞志敏卫新来王磊
Owner HEFEI UNIV
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