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Original Articles

Characteristics of fly ash from the dry flue gas desulfurization system for iron ore sintering plants

, , &
Pages 837-844 | Received 02 Sep 2010, Accepted 16 Jun 2011, Published online: 04 Nov 2011
 

Abstract

The characteristics of fly ash from the flue gas desulfurization (FGD) system are important for its reuse and are mainly depend on the desulfurization process. The physical and chemical properties of DSF ash, which refers to fly ash from the dry FGD system for the iron ore sintering process, were investigated. Its mineralogical contents were determined by X-ray diffraction and thermogravimetry analysis, and its micro-morphology was studied by scanning electric micrograph analysis. The results show that DSF ash has a higher CaO and SO3 content, and the main sulfur form is sulfite, with only a part of it oxidized to sulfate. The major minerals present in DSF ash are hannebachite, anhydrite, calcite and portlandite; a minor constituent is calcium chloride. The particles of DSF ash are irregular, fragmentary and small, and hannebachite grows on their surfaces. Particle size is affected by the FGD process, and the ash size from the maximized emission reduction of the sintering–FGD process is lower than that from the circulating fluidized bed–FGD process. The particle size distribution of DSF ash follows the Rosin–Rammler–Bennet equation.

Acknowledgements

The authors gratefully acknowledge the financial support of this work by Maanshan Iron & Steel Co., Ltd.

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