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Curing chelation method for waste incineration fly ash

A waste incineration fly ash and chelation technology, which is applied in the direction of protective devices against harmful chemicals, can solve problems such as lack of close contact, no molding process, and loose and messy fly ash, so as to improve the treatment effect and reduce the amount of chemicals The effect of proportion

Inactive Publication Date: 2018-07-20
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fly ash treatment methods adopted by most waste incineration power plants are rough and simple, without emphasizing the mixing time and dosing sequence, and there is no molding process, the solidified and stabilized fly ash is loose and messy, and close contact cannot be achieved, resulting Waste of agent caused by uneven mixing of fly ash solidification stabilizer, incomplete solidification and stabilization of heavy metals in fly ash, and potential secondary pollution in the later stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 1000g of the fly ash mixture of a waste incineration power plant at different periods during normal operation, add 100g of slag, first stir rapidly at 100r / min for 30s and then slowly stir at 30r / min for 30s to obtain solidified fly ash; then spray Add 3g of TMT agent, first stir rapidly at 100r / min for 30s and then slowly stir at 30r / min for 30s to obtain solidified chelated fly ash; the solid-liquid ratio of solidified chelated fly ash is 0.15, forming uniform granular The mixture is then compacted and molded under a pressure of 20kN in a compacting mold, and maintained for 3 days to obtain a solidified body of waste incineration fly ash; a toxicity test is carried out on the solidified body of waste incineration fly ash, and the excess element Pb (14.40mg / L ) leaching concentration is 0.06mg / L, and Cd (4.39mg / L) leaching concentration is 0.03mg / L, both of which meet the pollution concentration limits in the "Pollution Control Standards for Domestic Waste Landfill...

Embodiment 2

[0037]Take 1000g of the fly ash mixture of a waste incineration power plant at different periods of normal operation, add 170g of the mixture of fly ash and alumina cement, first stir rapidly at 150r / min for 30s, then slowly stir at 50r / min for 30s, Obtain solidified fly ash; then add the DTCR agent of 35g with spraying mode, first stir 30s at a fast speed under 150r / min and then slowly stir at 50r / min for 30s, obtain solidified chelated fly ash; wherein the solidified chelated fly ash The liquid ratio is 0.21 to form a uniform granular mixture, which is then compacted and formed in a compacting mold under a pressure of 38kN, and cured for 5 days to obtain a solidified body of waste incineration fly ash. Toxicity experiments were carried out on the waste incineration fly ash solidified body. The leaching concentration of the exceeding standard element Pb (20.01mg / L) was 0.21mg / L, the leaching concentration of Cd (8.34mg / L) was 0.08mg / L, and the leaching concentration of Cr (7.4...

Embodiment 3

[0039] Take 1000g of the fly ash mixture of a waste incineration power plant at different periods of normal operation, add 370g of heat-activated kaolin mixture, first stir rapidly at 150r / min for 30s and then slowly stir at 50r / min for 30s to obtain solidified fly ash; Then add the mixture of the DTCR agent of 65g and the TMT agent in a spray mode, first stir 30s at a fast speed under 150r / min and then stir at a slow speed 30s under 50r / min, obtain the solidified chelated fly ash; wherein the solidified chelated fly ash The liquid ratio is 0.21 to form a uniform granular mixture, which is then compacted and formed in a compacting mold under a pressure of 38kN, and cured for 7 days to obtain a solidified body of waste incineration fly ash. A toxicity test was carried out on the solidified body of the waste incineration fly ash. The leaching concentration of Cr (16.23mg / L) was 0.29mg / L, and the leaching concentration of all heavy metals met the "Standards for Pollution Control o...

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Abstract

The invention belongs to the technical field of hazardous waste treatment and environmental protection, and relates to a curing chelation method for waste incineration fly ash. The curing chelation method for the waste incineration fly ash comprises the following steps that (1) the waste incineration fly ash to be processed and a curing agent are mixed in a certain proportion and then stirred uniformly, and cured fly ash is obtained; (2) a certain amount of chelating agent is sprayed into the cured fly ash, uniform stirring is carried out, and cured and chelated fly ash is obtained; and (3) the cured and chelated fly ash is put into a compaction die for compaction molding, the maintenance is carried out for 3-7 days, and a waste incineration fly ash cured body is obtained. According to thecuring chelation method for the waste incineration fly ash, the fly ash and the curing agent are first mixed mode, then a stabilizer is sprayed for sprinkle wet stirring, and then the compaction molding is carried out under certain pressure, so that sufficient contact and reaction between the fly ash and the agents are realized to be beneficial to reducing the proportion of the agents used and improving the treatment effect of heavy metals in the fly ash.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment and environmental protection, and relates to a solidification and chelation method for waste incineration fly ash, in particular to a method capable of solidifying and stabilizing heavy metals in waste incineration fly ash. Background technique [0002] At present, waste incineration technology has become the main means of domestic waste treatment in large and medium-sized cities in my country. Especially since 2003, the number of waste incineration plants has increased rapidly, and the incineration capacity has increased dramatically. By 2013, the amount of waste incineration has increased by more than 8 times compared with 2003, and the proportion of waste incineration has increased from 3.69% in 2003 to 26.8% in 2013. As of May 2014, there were 178 waste incineration power plants across the country. According to relevant plans, in 2015, there are expected to be more than 300 ...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D101/08A62D101/43
CPCA62D3/33A62D2101/08A62D2101/43
Inventor 邵雁王文坦郭华军刘子豪李社锋陈堃向浩覃慧徐秀英
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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