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Wet flue gas desulphurization (FGD) is a crucial technology which can be used   to abate the emission of sulphur dioxide in coal power plants. The   dissolution of coal fly ash in adipic acid is investigated by varying acid   concentration (0.05-0.15M), particle size (45- 150μm), pH (5.5-7.0),   temperature (318-363K) and solid to liquid ratio (5-15 wt %.) over a period   of 60 minutes which is a crucial step in wet (FGD). Characterization of the   sorbent was done using X-ray fluorescence (XRF), X-ray diffraction (XRD),   Furrier transform infrared (FTIR), scanning electron microscope (SEM) and   Branauer-Emmett-Teller (BET) surface area. BET surface area results showed an   increase in the specific surface area and SEM observation indicated a porous   structure was formed after dissolution. The experimental data was analyzed   using the shrinking core model and the diffusion through the product layer   was found to be the rate limiting step. The activation energy for the process   was calculated to be 10.64kJ/mol

Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution