[1] National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huaian,223003, China
[2] Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu, Huaiyin Institute of Technology, Huaian,Jiangsu Province,223003, China
[3] School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou,221116, China