Abstract
The desilication kinetics of synthetic Bayer liquor by use of calcium sulfate dihydrate (CaSO 4·2H 2O) was studied experimentally and modelled mathematically. Temperature, initial silica concentration, and the dosage of CaSO 4·2H 2O were found to be the main factors affecting desilication reaction. CaSO 4·2H 2O was proved to remove up to 95% silica from sodium aluminate solution under the optimum operation conditions. A surface integration kinetic model, assuming that the desilication process follows a pseudo-second-order kinetics, was developed and successfully model the experiment data of desilication process via CaSO 4·2H 2O at the range of operating conditions investigated. An activation energy of 52 kJ/mol was estimated for the desilication process with CaSO 4·2H 2O over the temperature of 80-100 °C. The desilication reaction products (DSP) were analyzed by XRD and SEM, and found to be mainly Hauyne (3Na 2O·2CaSO 4·3Al 2O 3·6SiO 2) and Lazurite (3Na 2O·CaSO 4·0.5Na 2SO 4·3Al 2O 3·6SiO 2). The final sulfate concentration in the liquor after desilication with CaSO 4·2H 2O was ~ 0.021 g/L.
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