Startseite Microwave-assisted decomposition of fgd gypsum in the presence of magnetite and anthracite
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Microwave-assisted decomposition of fgd gypsum in the presence of magnetite and anthracite

  • Zhong-Hai Ji , Yu Guo , Jin Chen EMAIL logo , Li-Na Guo , Bo Yang , Xue-Fang Zhang , Ling-Jia Meng und Li Qin
Veröffentlicht/Copyright: 31. Mai 2016
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Chemical Papers
Aus der Zeitschrift Chemical Papers Band 70 Heft 10

Abstract

Decomposition of flue gas desulfurization (FGD) gypsum in the presence of (10 mass %) magnetite and different mass fractions of anthracite, as a reducer, has been investigated under microwave irradiation in air atmosphere. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the decomposition residues. Both experiment results and theoretical analysis indicated that the optimum amount of anthracite added to the FGD gypsum (10 mass %) magnetite mixture was 8 mass %. Under optimum conditions, the maximum desulfurization degree after microwave treatment for 60 min at 1000°C was 93.86 %. Due to microwave heating and calcium ferrite formation, the decomposition temperature of FGD gypsum decreased to around 800°C in air atmosphere. Based on the XRD patterns and SEM images, the reaction of CaSO4 with the additives occurred from the centre to the surface where the liquid phase was generated under microwave heating. SEM images also showed a lower amount of the liquid phase in the outermost layer samples, which prevented the formation of a kiln ring under microwave heating.

Keywords: FGD gypsum; magnetite; microwave heating; desulfurtion degree; calcium ferrite

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Received: 2015-12-30
Revised: 2016-3-6
Accepted: 2016-3-8
Published Online: 2016-5-31
Published in Print: 2016-10-1

© Institute of Chemistry, Slovak Academy of Sciences

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https://doi.org/10.1515/chempap-2016-0071
Schlagwörter für diesen Artikel
FGD gypsum; magnetite; microwave heating; desulfurtion degree; calcium ferrite

Artikel in diesem Heft

  1. Original Paper
  2. Simultaneous analysis of polar and non-polar components of cell membrane phospholipids by GC-MS
  3. Original Paper
  4. Cloud point extraction of disulfiram for its HPLC-MS/MS determination in synthetic urine
  5. Original Paper
  6. Revealing the seed proteome of the health benefitting grain amaranth (Amaranthus cruentus L.)
  7. Original Paper
  8. Possible role of hydrolytic enzymes (Sap, Kex2) in Candida albicans response to aromatic compounds bearing a sulfone moiety
  9. Original Paper
  10. Using nutritional and oxidative stress to increase content of healthbeneficial fatty acids in oleaginous and non-oleaginous yeasts
  11. Original Paper
  12. Fatty acids and amino acids of entomopathogenic fungus Conidiobolus coronatus grown on minimal and rich media
  13. Original Paper
  14. Promotional effect of cobalt addition on catalytic performance of Ce0.5Zr0.5O2 mixed oxide for diesel soot combustion
  15. Original Paper
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