Effects of particle size and morphology on microwave cracking characteristics and cracking mechanism of three Fe-containing ores

Abstract Microwave irradiation is a potential technology for use in rock fracturing. It of great significance the application microwave metal mines to understand cracking characteristics ores and mechanism action ores. Taking Hongtoushan copper ore, Sishanling iron Dandong gold ore as research objects, with different morphologies (bulk/particle samples) particle sizes were investigated. The was revealed based on dielectric properties arc characteristics. results show that change morphology affects thereof. failure characterized by generation cracks crack direction related morphology. bulk not damaged after irradiation, but damage particles scorching or melting accompanied cracks. more power applied, larger particles, stronger arcing. Compared type size has little effect properties. (smooth surface) reflection (rough discharge effect. particulate combined heating effects, which leads fracture. mainly one heating. provide guidance development ore-cracking equipment selection optimal sequence.