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Pre-dechlorinating-sintering treatment technology for high-chlorine metallurgical waste and incineration fly ash

A technology for metallurgical waste and fly ash incineration, which is applied in the direction of solid waste removal, transportation and packaging, chemical instruments and methods, etc., can solve the problems of difficult treatment and difficult recycling, and achieve low pollution, reduce equipment corrosion, reduce degassing Effect of Chlorine Loading

Active Publication Date: 2019-11-19
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the current high-chlorine metallurgical dust, waste incineration fly ash, chlorine-containing wastewater and other pollutants rich in alkali, heavy metals, and dioxins, there are technical problems such as difficult to handle and difficult to recycle. The purpose of the present invention is to provide a High-chlorine metallurgical waste and incineration fly ash are processed together through pre-dechlorination and sintering to realize resource utilization. This process can simultaneously realize the treatment of high-chloride metallurgical waste, incineration fly ash and chlorine-containing wastewater, and effectively degrade through the pre-roasting process The dioxins in the mixed raw materials are removed, and part of the volatile chlorine salts are removed at the same time. Finally, it participates in sintering in the form of replacing the sintering base material, and realizes high-chlorine harmful The harmless treatment and resource utilization of materials have achieved the purpose of comprehensive utilization of chlorine-containing waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The sintering machine head ash and waste incineration fly ash (the mass ratio of the two is 3:1, and the chlorine content is higher than 10%), 2%wt biochar with a particle size of less than 1mm is strongly mixed, and then pressed into a flat sheet with a diameter of 15mm. Through the pickling chlorine-containing wastewater in the iron and steel metallurgical process, the moisture content of the mixture is adjusted to 8%, and the conventional heating (heating rate is lower than 100°C / min) is used for pretreatment to control the oxygen supply and the oxygen required for fuel combustion. The amount ratio is 1.2, the temperature is raised to 650° C., and roasted for 30 minutes. After the sintering process, the total degradation rate of dioxin is 82.33%, and the total removal rate of Cl is 84.81%.

Embodiment 2

[0034] After the sintering machine head ash and waste incineration fly ash (the mass ratio of the two is 3:1, and the chlorine content is higher than 10%), 2%wt biochar with a particle size of less than 1mm is strongly mixed, and the iron and steel metallurgical process is carried out. The acid-washing chlorine-containing wastewater adjusted the water content of the mixture to 8%, pressed into a flat mass with a diameter of 15mm, and participated in sintering treatment. After treatment, the total degradation rate of dioxin reached 80.65%, and the total removal rate of Cl was 86.27%.

[0035] Example 1

[0036] After the sintering machine head ash and waste incineration fly ash (the mass ratio of the two is 3:1, and the chlorine content is higher than 10%), 2%wt biochar with a particle size of less than 1mm is strongly mixed, and the iron and steel metallurgical process is carried out. Pickling chlorine-containing waste water regulates the moisture content of the mixed material...

Embodiment 3

[0040] After the sintering machine head ash and the waste incineration fly ash (the mass ratio of the two is 6:1, the chlorine content is higher than 10%, and the biochar with a particle size of 3% wt is less than 1mm is strongly mixed, and the acid is passed through the iron and steel metallurgical process. Wash the chlorine-containing wastewater, adjust the moisture content of the mixture to 10%, press it into a flat mass with a diameter of 20mm, put it in a tubular microwave heating furnace, adjust the ratio of oxygen supply to fuel combustion to 1.0, and heat up to 900 ℃, roasted for 20 minutes, after the sintering process, the total degradation rate of dioxins reached 96.17%, and the total removal rate of Cl was 93.41%.

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Abstract

The invention discloses a pre-dechlorinating-sintering treatment technology for high-chlorine metallurgical waste and incineration fly ash. The technology comprises the processes that high-chlorine metallurgical dust sludge, waste incineration fly ash and carbonaceous fuel are mixed uniformly and then pressed into block masses after the water content is balanced by adopting chlorine-containing wastewater; the obtained block masses are arranged in an oxygen-deficient atmosphere to be subjected to roasting pretreatment, and roasting block masses are obtained; and the roasting block masses serveas an iron ore sintering bottoming material to participate in sintering. According to the technology, pollution of chlorine and dioxin in the solid waste sintering process is reduced through roastingpretreatment, resource utilization of components such as Fe, Ca and C in the solid waste such as the high-chlorine metallurgical dust sludge and the waste incineration fly ash is achieved, and meanwhile reuse of the chlorine-containing wastewater is achieved.

Description

technical field [0001] The invention relates to a solid waste treatment process, in particular to a method for treating high-chlorinated metallurgical waste and incineration fly ash through pre-dechlorination and sintering, which belongs to the harmless treatment and resource utilization of metallurgical solid waste and waste incineration fly ash technical field. Background technique [0002] Sintering machine head ash and waste incineration fly ash (hazardous waste, HW18 category) are typical high-chloride dust in iron and steel metallurgical solid waste and municipal solid waste respectively. It is a component that can be utilized through the iron ore sintering process, but the existence of unfavorable factors such as alkali, heavy metals, and dioxins limits its large-scale utilization. Therefore, reducing the impact of alkalis, heavy metals, and dioxins is the key. According to relevant literature reports, the alkali and heavy metals in sintering machine head ash and wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00B09B2101/30
Inventor 范晓慧汪国靖甘敏叶恒棣王兆才周志安季志云陈许玲黄晓贤袁礼顺肖恒
Owner CENT SOUTH UNIV
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