DESULFURIZATION YIELD OF CALCIUM HYDROXIDE FLY-ASH MIXTURES - THERMOGRAVIMETRIC DETERMINATION

This work reports the thermogravimetric characterization of the solid products resulting from the low temperature reaction between SO2 and m ixed solids containing hydrated mixtures of calcium hydroxide and fly- ashes. The latter sorbents were obtained after a pressurized hydration procedure of coal fly-ashes and commercial calcium hydroxide followin g a factorial design of the experiments. The analysis of the TG curves performed in a high temperature thermobalance allowed calculation of yield of the desulfurization reaction expressed as mol SO2/mol Ca, a p arameter needed for the design and optimization of desulfurization pro cesses.