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Dry dechlorination process for waste incineration fly ash

A technology for waste incineration fly ash and dechlorination, which is applied in the direction of protection devices against harmful chemicals, can solve the problems of a large number of harmful waste liquids, increase the types and quantities of hazardous wastes, etc., to avoid secondary pollution, reduce content, and achieve high efficiency. removal effect

Active Publication Date: 2020-08-28
浙江中陶环保科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional water washing method can reduce the chloride ion content in the fly ash to a certain extent, a large amount of harmful waste liquid will be generated during the operation, thus increasing the types and quantities of hazardous wastes to be disposed of

Method used

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  • Dry dechlorination process for waste incineration fly ash
  • Dry dechlorination process for waste incineration fly ash
  • Dry dechlorination process for waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Effect of Mass Ratio of Titanium Dioxide Powder and Waste Incineration Fly Ash on Removal Efficiency of Chlorine and Dioxins

[0018] Dechlorination treatment of waste incineration fly ash: such as figure 1 As shown, according to the mass ratio of titanium dioxide powder and waste incineration fly ash 0.5:1000, 0.7:1000, 0.9:1000, 1:1000, 3:1000, 5:1000, 5.5:1000, 6:1000, 7:1000 respectively Take titanium dioxide powder and waste incineration fly ash, mix them, and grind them at 200rpm for 1 hour to obtain titanium-mixed fly ash; grind expanded perlite and pass through a 200-mesh sieve to obtain expanded perlite powder; Powder mass ratio 5:100 Weigh sodium persulfate and expanded perlite powder respectively, mix and dissolve in water, stir until sodium persulfate is completely dissolved, let stand for 3 hours, separate solid and liquid, air-dry at room temperature to obtain sulfur Loaded expanded perlite powder; according to the mass ratio of sulfur-loaded expanded per...

Embodiment 2

[0028] Effect of mass ratio of sodium persulfate to expanded perlite powder on the removal rate of chlorine and dioxins

[0029] Dechlorination treatment of waste incineration fly ash: Weigh titanium dioxide powder and waste incineration fly ash according to the mass ratio of titanium dioxide powder and waste incineration fly ash of 5:1000, mix them, and grind them for 2 hours at a rate of 600 rpm to obtain titanium-doped fly ash; Perlite is ground and passed through a 300-mesh sieve to obtain expanded perlite powder; according to the mass ratio of sodium persulfate to expanded perlite powder: 2.5:100, 3.5:100, 4.5:100, 5:100, 10:100, 15:100 , 15.5:100, 16.5:100, 17.5:100 Weigh sodium persulfate and expanded perlite powder respectively, mix and dissolve in water, stir until sodium persulfate is completely dissolved, let stand for 3 hours, separate solid and liquid, room temperature Air-dried under the conditions to obtain sulfur-loaded expanded perlite powder; according to the...

Embodiment 3

[0035] Effect of mass ratio of sulfur-loaded expanded perlite powder to titanium-doped fly ash on the removal rate of chlorine and dioxins

[0036] Dechlorination treatment of waste incineration fly ash: Weigh titanium dioxide powder and waste incineration fly ash according to the mass ratio of titanium dioxide powder and waste incineration fly ash of 5:1000, mix them, and grind them for 3 hours at a rate of 1000rpm to obtain titanium-doped fly ash; Grind perlite and pass through a 400 mesh sieve to obtain expanded perlite powder; weigh sodium peroxodisulfate and expanded perlite powder respectively according to the mass ratio of sodium peroxodisulfate and expanded perlite powder at 15:100, dissolve in water after mixing, and stir Dissolve completely to sodium peroxodisulfate, leave standstill 6 hours, separate solid and liquid, air-dry under room temperature condition, obtain sulfur-loaded expanded perlite powder; 100, 2.5:100, 3:100, 9:100, 15:100, 16:100, 17:100, 18:100 res...

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Abstract

The invention discloses a dry dechlorination process for waste incineration fly ash. The process comprises the following steps: (1) mixing titanium dioxide and waste incineration fly ash, and grindingto obtain titanium-doped fly ash; (2) mixing sodium persulfate and expanded perlite powder, dissolving the obtained mixture in water, standing, carrying out solid-liquid separation, and air-drying toobtain sulfur-loaded expanded perlite powder; and (3) mixing the sulfur-loaded expanded perlite powder and the titanium-doped fly ash, and carrying out low-temperature plasma irradiation to obtain the dechlorinated fly ash. Through the simple dry dechlorination process, chloride ions in the waste incineration fly ash are efficiently removed, the removal rate of the chloride ions is as high as 97%, and secondary pollution caused by a traditional water washing method is avoided; and when the chloride ions are removed, the content of dioxin substances in the fly ash is also remarkably reduced, and the removal rate of the dioxin substances reaches up to 96%.

Description

technical field [0001] The invention relates to a harmless treatment process for waste incineration fly ash, in particular to a dry dechlorination process for waste incineration fly ash. Background technique [0002] Waste incineration fly ash is the trappings of the flue gas purification system and the bottom ash settled at the bottom of the flue and chimney during the municipal solid waste incineration disposal process. It not only contains heavy metals and dioxin-like toxic and harmful substances, but also contains 5% to 20% % of free chloride ions. The high content of chloride ions not only makes the harmless disposal of waste incineration fly ash more difficult, but also severely limits the application of fly ash after harmless disposal in the construction field. For example, using high-temperature sintering or vitrification technology to dispose of waste incineration fly ash can obtain very stable glass or solidified body, but under high temperature environment, the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/19A62D3/38A62D101/08
CPCA62D3/19A62D3/38A62D2101/08
Inventor 黄涛宋东平金俊勋刘龙飞周璐璐张树文
Owner 浙江中陶环保科技集团有限公司
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