1. Key Laboratory of Coal Processing and Efficient Utilization (Ministry of Education), School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, China
2. Department of Geoscience and Petroleum, Faculty of Engineering Science, Norwegian University of Science and Technology, Trondheim, Norway
3. Maelgwyn Mineral Services Ltd, Cardiff, UK
4. Department of Materials, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
5. Minerals and Metallurgical Engineering, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, Luleå, Sweden