1. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China
3. School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, China
4. Henan Geological Bureau, China Chemical Geology and Mine Bureau, Zhengzhou 450000, Henan, China