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Characteristics of gypsum crystal growth over calcium-based slurry in desulfurization reactions

Authors
Journal
Materials Research Bulletin
0025-5408
Publisher
Elsevier
Publication Date
Volume
32
Issue
2
Identifiers
DOI: 10.1016/s0025-5408(96)00181-x
Keywords
  • A. Oxides
  • B. Crystal Growth
  • C. Electron Microscopy
  • C. Infrared Spectroscopy
  • C. X-Ray Diffraction

Abstract

Abstract A wet absorption of sulfur dioxide in a batch-type reactor was carried out, using three calcium compounds, namely, CaCO 3, CaO, and Ca(OH) 2 as absorbents. Based on Fourier Transform Infrared, X-ray diffraction, and scanning electron microscopy analyses, the different absorbents resulted in the different reaction pathways and mechanisms of crystal formation at the early reaction stage. In particular, the CaSO 3 · 1 2 H 2O produced from CaO and Ca(OH) 2 showed spherical aggregates consisting of small subparticles, rather than plate or needle-like crystals, of CaSO 4 · 2H 2O from CaCO 3. This might be due to the different solubility of the absorbents in water.

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