Cooperative treatment method for dioxin and heavy metal in flying ash on basis of steel slag and mineral slag

A co-processing and heavy metal technology, applied to the removal of solid waste, etc., can solve the problems of huge difference in properties of dioxins and heavy metals, large energy consumption of heat treatment technology, increased difficulty of process control, etc., to solve the problem of low comprehensive utilization rate and low price , Reduce the effect of ball milling time

Active Publication Date: 2019-08-16
CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat treatment technology consumes a lot of energy, the cost is too high, and it will increase the risk of pollutants entering the gas phase and causing secondary pollution.
Due to the huge difference in the properties of dioxins and heavy metals, it is difficult to treat dioxins and heavy metals in fly ash at the same time by other methods
However, the combination of multiple methods will greatly increase the processing cost and increase the difficulty of process control.

Method used

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  • Cooperative treatment method for dioxin and heavy metal in flying ash on basis of steel slag and mineral slag
  • Cooperative treatment method for dioxin and heavy metal in flying ash on basis of steel slag and mineral slag
  • Cooperative treatment method for dioxin and heavy metal in flying ash on basis of steel slag and mineral slag

Examples

Experimental program
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Effect test

Embodiment 1

[0045]The object of treatment is the incineration fly ash produced during the normal operation of a waste incineration power plant. After drying, weigh 500g of the fly ash, add 80g of hot stuffy steel slag and 20g of graphite in a steel plant, mix them and put them into a planetary mill for ball milling. The ball milling time is 2h. The autorotation speed of the planetary mill is 1200r / min, and the revolution speed is 600r / min. After half an hour of ball milling, stop for 10 minutes and continue ball milling to obtain organochlorine-degraded fly ash; add 51 g of slag powder and 9 g of cement clinker to the organochlorine-degraded fly ash to obtain a fly ash mixture. Both slag powder and cement clinker are commercially available raw materials. Add 99g of water to the fly ash mixture, stir at 30r / min for 1min, mix well, pressurize and mold under a pressure of 30kN, and cure for 7 days to obtain a solidified fly ash body; perform a toxicity leaching test on the solidified fly as...

Embodiment 2

[0047] The object of treatment is the incineration fly ash produced during the normal operation of a waste incineration power plant. After drying, weigh 500g of the fly ash, add 70g of hot stuffy steel slag from a steel plant, 10g of iron powder, and 20g of graphite. After mixing, put it into a planetary mill for ball milling. The ball milling time is 4 hours. The autopropagation speed of the planetary mill is 1200r / min, and the revolution speed is 600r / min. After every half hour of ball milling, stop for 10 minutes and continue ball milling to obtain organochlorine-degraded fly ash; add 102 g of slag powder and 18 g of aluminate cement to the organochlorine-degraded fly ash to obtain a fly ash mixture. Both slag powder and cement clinker are commercially available raw materials. Add 99 g of vitamin C solution with a concentration of 66 g / L to the fly ash mixture, stir at 30 r / min for 1 min, mix well, pressurize under a pressure of 30 kN, and maintain for 7 days to obtain a s...

Embodiment 3

[0049] The object of treatment is the waste incineration fly ash in Case 1. After drying, weigh 500g of the fly ash, add 80g of hot stuffy steel slag and 20g of graphite in a steel plant, mix them and put them into a planetary mill for ball milling. The ball milling time is 3 hours. The autorotation speed of the planetary mill is 1200r / min, and the revolution speed is 600r / min. After every half hour of ball milling, stop for 10 minutes and continue ball milling to obtain organochlorine-degraded fly ash; add 51 g of slag powder and 9 g of aluminate cement to the organochlorine-degraded fly ash to obtain a fly ash mixture. Both slag powder and cement clinker are commercially available raw materials. Add 99g of water to the fly ash mixture, stir at 30r / min for 1min, mix well, pressurize and mold under a pressure of 30kN, and cure for 7 days to obtain a solidified fly ash body; perform a toxicity leaching test on the solidified fly ash , the leaching concentration of excessive h...

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Abstract

A cooperative treatment method for dioxin and heavy metal in flying ash on the basis of steel slag and mineral slag is characterized by comprising the following steps that (1) to-be-treated flying ashand a dehalogenation agent are mixed according to a mass ratio of 4:1-9:1, mixed milling is conducted by a planetary mill or a ball mill, and after 2-10 h of continuous ball milling, organochlorine degradation flying ash is obtained; (2) the organochlorine degradation flying ash and a curing agent are mixed according to the mass ratio of 4:1-9:1 and are stirred evenly, and a flying ash mixture isobtained; and (3) water or a reducing agent of the mass ratio of 15% is added into the flying ash mixture, the obtained mixture is put into a compaction die for compaction forming, pressure is 20-50kN, pressing time is 15-30 s, maintenance is conducted for 3-7 days, and a flying ash solidified body is obtained. Through the cooperative treatment method, dioxins and heavy metal pollutants can be treated simultaneously, steel slag serves as a main material of the dehalogenation agent and can be utilized efficiently, and the problem of a low comprehensive utilization rate of the steel slag is solved while the flying ash is treated.

Description

technical field [0001] The invention relates to the field of hazardous waste treatment, in particular to a method for synergistically treating dioxin and heavy metals in fly ash based on steel slag and slag. Background technique [0002] Waste incineration, medical waste incineration and industrial production will produce incineration fly ash, and fly ash will enrich trace heavy metals in the following two ways: 1) During incineration, volatile metal compounds condense on the surface of suspended particles; 2) Incineration Afterwards, vaporized metals also condense directly on other volatiles. In addition, due to the presence of chlorides, persistent pollutants such as chlorinated dibenzodioxins and polychlorfurans will be produced during the incineration process of garbage. Therefore, the fly ash of domestic waste incineration is hazardous waste and must be treated innocuously. [0003] Generally speaking, the harmless treatment of municipal waste incineration fly ash can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 周显胡波龚壁卫童军孙慧刘军李从安
Owner CHANGJIANG RIVER SCI RES INST CHANGJIANG WATER RESOURCES COMMISSION
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