Influence of Microwave Irradiation on Calcium Sulphate Crystal Phase

Abstract

In present studies, a special experiment system was designed to obtain calcium sulphate crystal under the similar temperature-profile increase in microwave heating and traditional heating by water bath. The main products heated by water bath heating are calcium sulphate dihydrates, but a small quantity of calcium sulphate hemihydrates are detected with microwave heating. By multiphysics calculation and experimental measurement, the results show that this difference is not induced by non-thermal effect and calcium sulphate hemihydrates induced by hot spot during the microwave heating.