Fly ash detoxification treatment method and equipment

A treatment method and fly ash technology, applied in the field of fly ash treatment, can solve the problems of insufficient research and application of fly ash detoxification and resource utilization, reduction treatment of fly ash and biogas residue, complicated process, etc. Sustained development, realization of solidification and detoxification, and improvement of residue content

Pending Publication Date: 2021-01-29
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

However, the above method is complicated in process and high in cost, and does not reduce the amount of fly ash and biogas residue, so it is suitable for fly ash landfill treatment
[0006] To sum up, at present, the research and application on the use of anaerobic fermentation biogas residue to realize the detoxification and resource utilization of fly ash are still insufficient.

Method used

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  • Fly ash detoxification treatment method and equipment
  • Fly ash detoxification treatment method and equipment
  • Fly ash detoxification treatment method and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Mix a certain quality of biogas residue (moisture content 80%) and fly ash accounting for 20% of the mass of wet biogas residue, and stir vigorously at a speed of 100r / min for 0.5h to obtain a premixed mortar; Heat and stir at ℃ for 60 min to obtain heated mortar. The heated mortar is subjected to solid-liquid separation by pressure filtration to obtain liquid and solid. Put the liquid into the sewage treatment system of the sewage treatment plant and discharge it after reaching the standard. The solid was subjected to pyrolysis and carbonization treatment at 600° C. for 40 minutes to obtain a detoxified residue. The generated pyrolysis gas is burned to generate heat to provide heat for the pyrolysis process, and the high-temperature flue gas generated by the pyrolysis gas combustion is used as a heat source to heat the premixed mortar. The leaching of heavy metals from the detoxification residue is determined by the HJ / T299-2007 method, which is lower than the GB5085...

Embodiment 2

[0063] The wet base biogas residue and fly ash are mixed, wherein the proportion of fly ash added is 20% of the mass of the wet biogas residue. Stir vigorously at a speed of 100r / min for 0.5h to obtain a premixed mortar, and stir and heat the premixed mortar at 180°C for 60min under airtight conditions to obtain a heated mortar, which is called BR+FA. Put the heated mortar into a floor-standing centrifuge, centrifuge at 25°C at a speed of 3000r / min for 20min, and then remove the supernatant to obtain a centrifugally dehydrated solid phase. Dry the centrifugally dehydrated solid phase at 105°C for 24 hours to obtain the solid content; heat the centrifugally dehydrated solid phase in a constant temperature oven at 75°C continuously, record the change of moisture content every 15 minutes until it stops changing, and obtain the change of moisture content with time The curve is the dehydration solid phase drying characteristic curve. The above solid content rate and drying charact...

Embodiment 3

[0066] 100% biogas residue heated mortar press filter solid phase (BRH), 80% biogas residue mixed with 20% fly ash heated mortar press filter solid phase (BR+FAH) were dried and used for pyrolysis experiments. Take 30 g of experimental samples and put them into a tube pyrolysis furnace for pyrolysis. During the pyrolysis process, 20 mL / min of nitrogen gas was introduced as a protective gas, and the temperature was heated from room temperature to 600 °C at a heating rate of 15 °C / min. After 45 minutes of constant temperature, the pyrolysis ended, and after cooling to room temperature with the pyrolysis furnace, a pyrolysis residue was obtained. They are recorded as BRHC and BR+FAHC respectively. The dry samples of BRH, BRHC, BR+FAH, and BR+FAHC were analyzed for TCLP leaching characteristics of heavy metals, and compared with the dry samples of biogas residue (BR) and fly ash (FA), the results are shown in the table.

[0067] Table 1 Sample heavy metal TCLP analysis / (mg / L)

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Abstract

The invention belongs to the technical field of fly ash treatment, and relates to a fly ash detoxification treatment method and equipment. The fly ash detoxification treatment method comprises: uniformly mixing fly ash and biogas residues, forcibly stirring to obtain premixed mortar, heating and stirring the premixed mortar for 0.5-1 hour at 100-180 DEG C under a closed condition to obtain heatedmortar, and performing solid-liquid separation on the heated mortar to obtain a liquid and a solid; treating the liquid with sewage until the liquid reaches the standard, and discharging the treated liquid; and pyrolyzing the solid at 400-600 DEG C to obtain pyrolyzed residues, wherein the pyrolyzed residues are used as solid wastes for landfill or used as inorganic materials for preparing ceramics or sintered bricks. According to the method, detoxification of the fly ash can be implement by using the biogas residues, and stable solidification of heavy metal is implemented, so that dioxin substances in the fly ash are thoroughly eliminated, and secondary pollution is avoided; and efficient dehydration of the biogas residues and synergistic resource utilization of dehydration products can be implemented by using the fly ash, so that the problem of low-cost treatment of the fly ash and the biogas residues is solved.

Description

technical field [0001] The invention belongs to the technical field of fly ash treatment, and in particular relates to a fly ash detoxification treatment method and equipment. Background technique [0002] In recent years, with the rapid development of China's economy and the acceleration of urbanization, the generation and accumulation of domestic waste have increased year by year. Realizing the harmlessness, reduction and recycling of domestic waste is the key to solving the problem of "garbage siege". Incineration not only has the advantages of reducing the volume by up to 90% and reducing the weight by more than 75%, but also completely decomposes pollutants and has a high degree of harmlessness. At the same time, waste incineration can also generate heat for use, and has gradually become the mainstream treatment technology . According to statistics, my country's domestic waste incineration capacity has reached 298,100 tons per day, and it shows a continuous growth tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00C04B7/38C04B7/28
CPCB09B5/00C04B7/38C04B7/28B09B2101/30B09B3/40Y02P40/10Y02W30/20
Inventor 余广炜王玉汪印
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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