Direct impact characteristics of magnesite fragmentation by pulsed discharge in water

作     者：Yunxiao CAO Zhiqiang WANG Fei MA Zhengwei XING Zheng LIU Guofeng LI 曹云霄;王志强;马飞;邢政伟;刘征;李国锋

作者机构：School of Electrical Engineering Dalian University of Technology 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2019年第21卷第7期

页      面：90-96页

核心收录：

学科分类：080901[工学-物理电子学] 081902[工学-矿物加工工程] 0819[工学-矿业工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：supported by National Natural Science Foundation of China (No. 51607023) 

主　　题：pulsed discharge impact pressure plasma channel image analysis magnesite 

摘      要：To clarify direct impact characteristics(pressure and position) of middle-grade magnesite fragmentation by pulsed discharge in water, this work uses pressure film to accomplish passive measurement through pulsed discharge experiment and obtain the pressure. The impact position is determined by image analysis of fragmentation product morphology, crack edge and discharge channel. Then, pressure load on magnesite surface is numerically analyzed based on the measured pressure obtained from the film. Results indicate that, at 10 mm discharge gap, the impact pressure increases with the discharge voltage, and the discharge voltage to disintegrate magnesite is-40 kV. The impact position is normally in the boundary among different mineral *** analysis indicates that, the pressure load applied directly on magnesite surface is approximately 142.5 MPa at-40 kV and greater than the compressive strength of magnesite, thus leading to the fragmentation.