Study on the Deashing of Lignite with Hydrochloric Acid/Sodium Fluoride Leaching, Assisted by Microwave and Ultrasonic Waves

This study was aimed at investigating the effects of adding sodium fluoride (NaF) and using the assistance of ultrasonic and microwave energy on the removal efficiency of ash content during the hydrochloric acid (HCl) chemical leaching process of lignite samples from Zhaotong, Yunnan, China. Chemica...

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Bibliographic Details
Published in:Materials 2024-07, Vol.17 (14), p.3537
Main Authors: Ran, Xinming, Yuan, Jie
Format: Article
Language:English
Subjects:
Ashes
Burnout
Coal
Efficiency
Fluorides
Fourier transforms
Hydrochloric acid
Leaching
Lignite
Minerals
Radiation
Sodium
Sodium fluoride
Spectrum analysis
Sulfur
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Summary:This study was aimed at investigating the effects of adding sodium fluoride (NaF) and using the assistance of ultrasonic and microwave energy on the removal efficiency of ash content during the hydrochloric acid (HCl) chemical leaching process of lignite samples from Zhaotong, Yunnan, China. Chemical leaching was conducted on lignite samples from Zhaotong, Yunnan, China, under the experimental conditions of time (30-120 min), temperature (55-95 °C), microwave power (240-800 W), ultrasonic power (25-100%), and NaF addition concentration (0.2-1.2 M). The addition of NaF greatly improved the removal efficiency of ash content from lignite. Under optimized conditions, the addition of NaF increased the removal rate of ash content from lignite from 25% to 65.27%. The microwave-assisted deashing of lignite can significantly improve the deashing efficiency, with positive implications for the microstructure regulations of lignite. Ultrasonic-assisted deashing can lower the temperature for coal powder burnout and enhance the combustion performance of coal.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma17143537