The chemical and oxidation characteristics of semi-dry flue gas desulfurization ash from a steel factory

Ren-ping Liu, Bin Guo*, Ailing Ren, Jing-feng Bian

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Some samples of semi-dry flue gas desulfurization (FGD) ash were taken from sinter gas of a steel factory. Scanning electron microscope (SEM) and X-ray diffraction (XRD) analyses were employed to identify the samples in order to investigate their physical and chemical characteristics. The results show that semi-dry FGD ash from a steel factory is stable under atmospheric conditions. It has irregular shape, a smooth surface and loose construction. The size of FGD ash particles is around 0.5-25 mu m, the average size is about 5 mu m and the median diameter is 4.18 mu m. Semi-dry FGD ash from a steel factory consists of CaSO(3), CaSO(4), CaCO(3), some amorphous vitreous material and unburned carbon. An experimental method was found to study the oxidation characteristics of ash. A prediction model of the oxidation efficiency was obtained based on response surface methodology. The results show that not only the temperature, but also gas: solid ratio, play an important role in influencing the oxidation efficiency. The interactions of the gas: solid ratio with temperature play an essential role. An improved response surface model was obtained which can be helpful to describe the degree of oxidation efficiency of semi-dry FGD ash.

Original languageEnglish
Pages (from-to)865-871
Number of pages7
JournalWaste Management and Research
Volume28
Issue number10
DOIs
Publication statusPublished - Oct 2010
Externally publishedYes

Keywords

  • semi-dry FGD ash
  • RSM
  • oxidation characteristics
  • XRD
  • SEM
  • PARTICLE SPOUTED BED
  • CALCIUM BISULFITE
  • PORTLAND-CEMENT
  • FLY-ASH
  • GYPSUM
  • PRODUCTS
  • RETARDERS
  • LIMESTONE

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