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Microwave regeneration method for fly ash under ultrasonic wave pretreatment

A technology of fly ash and ultrasonic wave is applied in the technology of microwave fly ash regeneration, and the technology field of fly ash regeneration using microwave technology can achieve the effects of improving microwave regeneration efficiency, improving efficiency and quality, and reducing regeneration cost.

Inactive Publication Date: 2017-08-01
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The regeneration method introduced by the existing microwave heating regeneration technology is limited to several limited adsorption materials such as activated carbon and silica gel.

Method used

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  • Microwave regeneration method for fly ash under ultrasonic wave pretreatment
  • Microwave regeneration method for fly ash under ultrasonic wave pretreatment

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Experimental program
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Effect test

Embodiment 1

[0018] The present embodiment 1 comprises the following steps:

[0019] The first step is the screening of undisturbed fly ash.

[0020] The fly ash taken from a power plant was classified and screened to remove large particles of impurities, and the fly ash with a particle size of 0.03-0.05 mm was selected. Rinse the selected fly ash with deionized water until the leaching water is colorless and transparent. Put the washed fly ash in an oven at 60 °C for 6 h to obtain fresh fly ash.

[0021] The second step is the adsorption of fresh fly ash to methylene blue wastewater and the preparation of waste fly ash.

[0022] Take 200 g of fresh fly ash in a 1000 ml Erlenmeyer flask, and pour 500 ml of methylene blue solution according to the dosage of 0.2 g / ml. Adsorption was carried out in a water bath at 40 °C with magnetic stirring at 300 r / min for 1 h. Filter with double-layer filter paper, rinse the filter residue with deionized water repeatedly until it is clean, and put it ...

Embodiment 2

[0039] Present embodiment 2, comprises the following steps:

[0040] The first step is screening of fly ash and pretreatment of waste oil.

[0041] The fly ash taken from a power plant was classified and screened to remove large particles of impurities, and the fly ash with a particle size of 0.03-0.05 mm was selected. Rinse the selected fly ash with deionized water until the leaching water is colorless and transparent. Put the washed fly ash in an oven at 60 °C for 6 h to obtain fresh fly ash. Use a 400-800 mesh screen to filter the waste machinery oil from a factory to remove larger suspended impurities in the deteriorated machinery oil. Finally, the cleaned waste oil is placed in a centrifuge, and the remaining impurities in the waste oil are removed by centrifugal separation to obtain a mechanical oil with an acid value of 0.823 mgKOH / g (GB / T264).

[0042] The second step is the adsorption of fresh fly ash to the acid value in waste oil and the preparation of waste fly ...

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Abstract

The invention discloses a microwave regeneration method for fly ash under ultrasonic wave pretreatment. The microwave regeneration method comprises the following steps of pretreating the adsorbed and saturated fly ash by ultrasonic waves; putting into microwave equipment; mechanically stirring, and enabling the fly ash to present the disturbance state; sending a certain amount of CO2 and water vapor mixed gas, controlling the microwave power and regeneration time, and performing microwave radiation regeneration; stopping microwave heating, and cooling the fly ash to room temperature under the atmosphere of N2, CO and H2, so as to obtain the regenerated fly ash. The microwave regeneration method has the advantages that the ultrasonic synergistic action is fully utilized, the use of chemical reagent in the pretreatment process of fly ash is avoided, the secondary pollution is reduced, and the regeneration efficiency is improved.

Description

technical field [0001] The invention relates to a process for regenerating fly ash by microwave, in particular to a process for regenerating fly ash using microwave technology, which belongs to the field of environmental protection engineering. Background technique [0002] Fly ash is a fine powder with pozzolanic activity, the main chemical component is Al 2 o 3 , Fe 2 o 3 , SiO 2 Wait. Fly ash particles have porous physical structure, large specific surface area, high adsorption activity, low price and wide sources. As an adsorption material, fly ash has gradually been applied in the fields of water treatment and oil treatment. However, the pore structure of the fly ash saturated by adsorption is blocked by the adsorbate and loses the adsorption capacity. And after adsorbing harmful substances, it itself becomes a toxic and harmful substance. The direct discarding of saturated adsorbed fly ash will cause environmental pollution. Through regeneration, it can be recy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34
CPCB01J20/3433B01J20/3441B01J20/3475Y02C20/40
Inventor 欧阳平刘晓咏张贤明陈凌刘先斌
Owner CHONGQING TECH & BUSINESS UNIV