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Experimental Study on Combined Microwave-Magnetic Separation-Flotation Coal Desulfurization.

Guangming Wang1, Zhijun Ma1,2, Zhijing Zhou1

  • 1College of Mining, Liaoning Technical University, Fuxin 12300, China.

Molecules (Basel, Switzerland)
|August 29, 2024
PubMed
Summary

A novel microwave magnetic separation-flotation method significantly enhances coal desulfurization and deashing. This combined approach improves sulfur and ash removal rates by leveraging microwave irradiation to boost magnetic separation and flotation efficiency.

Keywords:
coaldeashing ratedesulfurization rateflotationmagnetic separationmicrowave irradiation

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Mineral Processing

Background:

  • Coal desulfurization and deashing are critical for environmental protection and efficient energy utilization.
  • Traditional methods often face limitations in achieving high removal rates and efficiency.
  • Developing advanced techniques to improve these processes is essential for the coal industry.

Purpose of the Study:

  • To investigate a combined microwave magnetic separation-flotation method for raw coal treatment.
  • To compare its effectiveness against single magnetic separation and microwave magnetic separation.
  • To optimize parameters and elucidate the mechanism of microwave irradiation on desulfurization and deashing.

Main Methods:

  • Comparative analysis of single magnetic separation, microwave magnetic separation, and microwave magnetic separation-flotation.
  • Systematic variation of parameters: microwave irradiation time and power, grinding time, magnetic field intensity, plate seam width, and reagent dosages (foaming agent, collector, inhibitor).
  • Analysis of microwave irradiation's effect on pyrite reactivity, magnetic properties, and coal surface characteristics.

Main Results:

  • The combined microwave magnetic separation-flotation method achieved optimal desulfurization at 76.51% and deashing at 61.91%.
  • Pyrite sulfur removal reached 96.50% under optimized conditions.
  • Microwave irradiation was found to enhance pyrite's magnetic properties and alter coal's surface hydrophilicity, improving both separation stages.

Conclusions:

  • The combined microwave magnetic separation-flotation method offers a superior approach for coal desulfurization and deashing.
  • Microwave irradiation plays a dual role, enhancing magnetic separation by increasing pyrite's magnetism and improving flotation by modifying coal surface properties.
  • Optimized parameters and understanding the underlying mechanisms pave the way for practical application.