[Lei, Zhiwu] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.
[Huang, Pengwu; Li, Zhao; Zhang, Qiwu; Hu, Huimin] Wuhan Univ Technol, Sch Resources & Environm Engn, Wuhan 430070, Hubei, Peoples R China.
[Zhang, Qiwu] Wuhan Univ Technol, Hubei Key Lab Mineral Resources Proc & Environm, Wuhan 430070, Hubei, Peoples R China.
[Li, Xuewei] Zhengzhou Univ Aeronaut, Sch Management Engn, Zhengzhou 450015, Henan, Peoples R China.