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The influence of impurities in FGD gypsum (>90% CaSO4·2H2O) on the kinetics of its transformation to α-calcium sulfate hemihydrate (α-HH, CaSO4·0.5H2O) has been seldom investigated. This work demonstrates that CaCO3 and CaSO3 in FGD gypsum retard the transformation kinetics under hydrothermal conditions at atmospheric pressure, while SiO2 produces little effect. The induction time elapsed to initiate...
Elemental mercury oxidation mechanism by gaseous advanced oxidation method was studied using density functional theory on Fe3O4 (111) surface containing H2O2 molecule. Fetet1- and Feoct2-terminated Fe3O4 (111) surfaces have been simultaneously considered both in H2O2 decomposition and hydroxyl pre-adsorbed Fe3O4 (111) interfaces. It is found that the Feoct2-terminated surface was more favored for...
The three primary lignocellulosic biomass components (cellulose, xylan and lignin), synthetic biomass samples (prepared by mixing the three primary components) and lignocellulosic biomass (oak, spruce and pine) were pyrolysed in a thermogravimetric analyser and a wire mesh reactor. Different reactivities were observed between the three biomass components. Cellulose mainly produced condensables and...
Preparation of α-calcium sulfate hemihydrate (α-HH) from flue gas desulfurization (FGD) gypsum is one of the most promising alternatives and of great value in effectively utilizing the FGD gypsum. Based upon a salt solution method and the optimum operating conditions obtained in the laboratory scale experiments, pilot scale tests have been conducted to confirm the feasibility of the process. The pilot...
Massive quantities of sulfite-rich flue gas desulfurization (FGD) scrubber sludge have been generated by coal burning power plants. Utilization of the sulfite-rich sludge for preparing α-calcium sulfate hemihydrate (α-HH), an important kind of cementitious material, is of particular interest to electric utilities and environmental preservation. In the experiment, calcium sulfite hemihydrate was directly...
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