The heating characteristics of CaO-SiO2-FetO system slags under microwave irradiation

In order to develop an efficient heating process for the waste slag treatme nt, the heating behavior of the synthetic CaO-SiO2-FetO slag under microwav e irradiation was investigated. The heating rate of the slags was found to vary with the ratio of Fe3+/(Fe2+ + Fe3+) in the slags and the microwave en ergy was most efficiently absorbed when the value of Fe3+/(Fe2+/Fe3+) was a round 0.16 with the largest dielectric loss of the slag. Also the hearing r ate was benefited considerably from the presence of CaFe3O5 and magnetite p hases in slags that have high value of dielectric loss. When the graphite p owder was added to the slags, healing rate was drastically increased and th e larger amount of carbon addition brought the higher value of heating rate .