title: The chemical and oxidation characteristics of semi-dry flue gas desulfurization ash from a steel factory.
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 µm, the average size is about 5 µm and the median diameter is 4.18 µm. Semi-dry FGD ash from a steel factory consists of CaSO₃, CaSO₄, CaCO₃, 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.
authors.affiliation: School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, China.
authors.forename: Ren-ping
authors.initials: RP
authors.lastname: Liu
authors.forename: Bin
authors.initials: B
authors.lastname: Guo
authors.forename: Ailing
authors.initials: A
authors.lastname: Ren
authors.forename: Jing-feng
authors.initials: JF
authors.lastname: Bian
mesh_terms: D003890:Desiccation; D007220:Industrial Waste; D010084:Oxidation-Reduction; D010316:Particle Size; D013232:Steel / Q000737:chemistry*; D013696:Temperature
chemical_list: D007220:Industrial Waste; D013232:Steel