College of Material Science and Engineering Xi'an University of Science and Technology Xi'an 710054 China;
Key Laboratory for Resource Exploration Research of Hebei Province Hebei University of Engineering Handan Hebei 056038 China;
College of Geology and Environment Xi'an University of Science and Technology Xi'an 710054 China;
Xi'an Research Institute Co. Ltd. China Coal Science and Industry Group Xi'an University of Science and Technology Xi'an 710077 China;
Key Laboratory for Resource Exploration Research of Hebei Province Hebei University of Engineering Handan Hebei 056038 China;