Heating characteristics and decomposition of pyrite and marcasite in a microwave field

The investigations into the dielectric heating characteristics of pyrite an d marcasite found that microwave power, crystal structure and particle size had an effect on dielectric heating rate. Marcasite could be heated at a h igher rate than pyrite. The studies exhibited that marcasite and pyrite cou ld be decomposed by dielectric heating in an atmosphere of nitrogen. Marcas ite was more readily decomposed than pyrite. Microscopic examinations and X -ray diffraction analysis showed that both the minerals were decomposed int o pyrrhotite (Fe1-xS) and elemental sulphur. (C) 2001 Elsevier Science Ltd. All rights reserved.