高压脉冲放电破碎菱镁矿石的实验研究
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摘要
为改善菱镁矿石机械磨碎中存在的细粒过磨、粉尘等问题,采用水中高压脉冲放电的方法对菱镁矿石的破碎特性进行实验。在?25kV条件下,对初始粒径约为6cm和8cm的菱镁矿石分别进行放电处理,利用显微成像、扫描电镜及能谱分析方法对破碎产物形态、成分进行分析,同时对破碎过程的冲击波压力进行研究。结果表明,菱镁矿石的破碎主要为解离破碎和混合破碎,产物中粒径小于150?m颗粒的质量分布比率小于10%,且可产生微米级的有用矿物单体颗粒,为菱镁矿石的后续分选提供了有利条件;破碎过程能量的转化效率为15.64%,符合相关理论研究结果。
To improve the problem of overgrinding and dust in the mechanical grinding of magnesite ores, the fragmentation characteristics of magnesite ores were experimentally studied by pulsed high-voltage discharge in water. magnesite ores, approximately 6 cm and 8 cm in diameter, were respectively processed at ?25 kV. The morphology and composition of fragmented products were analyzed by microscope imaging, SEM and energy spectrum. In addition, shock wave pressure in the fragmentation process was studied. The results show that fragmentation types of magnesite ores are mainly dissociation fragmentation and mixed fragmentation. The mass distribution ratio of particles below 150?m is less than 10%, and the useful mineral monomer particles with micron grade are produced, which provides favorable conditions for subsequent separation of magnesite ores. Energy conversion efficiency in the fragmentation process is 15.64%, which agrees with relevant theoretical research results.
To improve the problem of overgrinding and dust in the mechanical grinding of magnesite ores, the fragmentation characteristics of magnesite ores were experimentally studied by pulsed high-voltage discharge in water. magnesite ores, approximately 6 cm and 8 cm in diameter, were respectively processed at ?25 kV. The morphology and composition of fragmented products were analyzed by microscope imaging, SEM and energy spectrum. In addition, shock wave pressure in the fragmentation process was studied. The results show that fragmentation types of magnesite ores are mainly dissociation fragmentation and mixed fragmentation. The mass distribution ratio of particles below 150?m is less than 10%, and the useful mineral monomer particles with micron grade are produced, which provides favorable conditions for subsequent separation of magnesite ores. Energy conversion efficiency in the fragmentation process is 15.64%, which agrees with relevant theoretical research results.
引文
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[20]赵正,白鸽,王登红,等.中国成菱镁矿区带与关键科学问题[J].地质学报,2014,88(12):2326-2338.Zhao Zheng,Bai Ge,Wang Denghong,et al.The metallogenic belts of Chinese magnesite deposits and key scientific issues[J].Acta Geologica Sinica,2014,88(12):2326-2338.
[21]Li Xiandong,Liu Yi,Zhou Guyue,et al.Study on underwater subsonic electrical discharges:streamer morphology and development[C]//19th IEEE International Conference on Dielectric Liquids(ICDL),Manchester,UK,2017:25-29.
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[23]Yoshimi I,Shibayama A,Fujita T,et al.Liberation of materials by electrical disintegration for recycling[J].International Journal of the Society of Materials Engineering for Resources,2002,10(1):66-70.
[24]刘毅,李志远,李显东,等.水中脉冲激波对模拟岩层破碎试验[J].电工技术学报,2016,31(24):71-78.Liu Yi,Li Zhiyuan,Li Xiandong,et al.Experiments on the fracture of simulated stratum by underwater pulsed discharge shock waves[J].Transactions of China Electrotechnical Society,2016,31(24):71-78.
[25]李显东,刘毅,李志远,等.不均匀电场下水中脉冲放电观测及沉积能量对激波的影响[J].中国电机工程学报,2017,37(10):3028-3036.Li Xiandong,Liu Yi,Li Zhiyuan,et al.Observation of underwater pulse discharge and influence of deposited energy on shock wave in non-uniform electric field[J].Proceedings of the CSEE,2017,37(10):3028-3036.
[26]邓琦林,邵志勇,张雷,等.电水锤矿石粉碎的实验研究[J].机械工程师,1998(1):7-8.Deng Qilin,Shao Zhiyong,Zhang Lei,et al.Experimental study on the electrohydraulic comminution of ore[J].Mechaincal Engineer,1998(1):7-8.
[27]Singh V R,Lafaut J P,Wevers M,et al.Transient cavitation and associated mechanisms of stone disintegration[J].Innovation and Research in BioMedical Engineering,2000,21(1):14-22.
[28]Burkin V V,Kuznetsova N S,Lopatin V V.Wave dynamics of electric explosion in solids[J].Technical Physics,2009,54(5):644-650.
[29]李胜荣,许虹,申俊峰,等.结晶学与矿物学[M].北京:地质出版社,2008.
[30]Bluhm H,Frey W,Giese H,et al.Application of pulsed HV discharges to material fragmentation and recycling[J].IEEE Transactions on Dielectrics and Electrical Insulation,2000,7(5):625-636.
[31]刘明光,颜怀梁,温光一.电水锤效应及其应用[J].四川工业学院学报,1989,8(3):188-193.Liu Mingguang,Yan Huailiang,Wen Guangyi.Electrohydraulic effect and applications[J].Sichuan University of Science&Technology,1989,8(3):188-193.
[2]戴栋,宁文军,邵涛.大气压低温等离子体的研究现状与发展趋势[J].电工技术学报,2017,32(20):1-9.Dai Dong,Ning Wenjun,Shao Tao.A review on the state of art and future trends of atmospheric pressure low temperature plasmas[J].Transactions of China Electrotechnical Society,2017,32(20):1-9.
[3]张凯,王瑞雪,韩伟,等.等离子体重油加工技术研究进展[J].电工技术学报,2016,31(24):1-15.Zhang Kai,Wang Ruixue,Han Wei,et al.Progress of heavy oil processing by plasma technology[J].Transactions of China Electrotechnical Society,2016,31(24):1-15.
[4]孙冰.液相放电等离子体及其应用[M].北京:科学出版社,2013.
[5]董冰岩,甘青青,孙宇,等.高压脉冲放电协同复合型催化剂去除甲醛的实验[J].电工技术学报,2017,32(8):108-113.Dong Bingyan,Gan Qingqing,Sun Yu,et al.Degradation of formaldehyde by high voltage pulse discharge combined with compound catalyst[J].Transactions of China Electrotechnical Society,2017,32(8):108-113.
[6]章志成,裴彦良,刘振,等.高压短脉冲作用下岩石击穿特性的实验研究[J].高电压技术,2012,38(7):1719-1725.Zhang Zhicheng,Pei Yanliang,Liu Zhen,et al.Experimental research on rock breakdown under short high-voltage pulse[J].High Voltage Engineering,2012,38(7):1719-1725.
[7]李宏达,李欣,孟宪江,等.高压脉冲对岩混材料击穿效应的仿真研究[J].南京理工大学学报,2015,39(1):15-19.Li Hongda,Li Xin,Meng Xianjiang,et al.Simulation on effect of high voltage pulse on rock mixed materials breakdown[J].Journal of Nanjing University of Science&Technology,2015,39(1):15-19.
[8]韩若愚,吴佳玮,周海滨,等.水中裸铜丝与镀膜铜丝电爆炸积分光谱与冲击波特性实验研究[J].电工技术学报,2017,32(24):257-264.Han Ruoyu,Wu Jiawei,Zhou Haibin,et al.Experimental study of electrical explosion of bare and coated Cu wire in water[J].Transactions of China Electrotechnical Society,2017,32(24):257-264.
[9]许飞,赵跃民,张博,等.基于高压电脉冲破碎废弃电路板粒度分形特性[J].环境科学与技术,2015,38(2):139-145.Xu Fei,Zhao Yuemin,Zhang Bo,et al.Based on high-voltage pulse fragmentation of WPCBs size distribution fractal characteristics[J].Environmental Science&Technology,2015,38(2):139-145.
[10]Zhao Yueming,Zhang Bo,Duan Chenlong,et al.Material port fractal of fragmentation of waste printed circuit boards(WPCBs)by high-voltage pulse[J].Powder Technology,2015,269:219-226.
[11]Wang E,Shi Fengnian,Manlapig E.Experimental and numerical studies of selective fragmentation of mineral ores in electrical comminution[J].International Journal of Mineral Processing,2012,112:30-36.
[12]Andres U.Development and prospects of mineral liberation by electrical pulses[J].International Journal of Mineral Processing,2010,97(1):31-38.
[13]Chernet T.High voltage selective fragmentation for detailed mineralogical and analytical information,case study:Oiva’s gold-quartz-dyke in the lapland granulite belt,Laanila,Northern Finland[C]//Proceedings of the 10th International Congress for Applied Mineralogy(ICAM),Berlin,Heidelberg,2012:119-127.
[14]Ito M,Owada S,Nishimura T,et al.Experimental study of coal liberation:electrical disintegration versus roll-crusher comminution[J].International Journal of Mineral Processing,2009,92(1-2):7-14.
[15]左蔚然,赵跃民,何亚群,等.电脉冲破碎技术在超纯煤制备中的应用前景[J].煤炭科学技术,2012,40(1):122-125.Zuo Weiran,Zhao Yuemin,He Yaqun,et al.Application outlook of electric pulse crushing technology to preparation of super clean coal[J].Coal Science&Technology,2012,40(1):122-125.
[16]Wang E,Shi Fengnian,Manlapig E.Mineral liberation by high voltage pulses and conventional comminution with same specific energy levels[J].Minerals Engineering,2012,27:28-36.
[17]Martello E D,Bernardis S,Larsen R B,et al.Electrical fragmentation as a novel route for the refinement of quartz raw materials for trace mineral impurities[J].Powder Technology,2012,224:209-216.
[18]Sperner B,Jonckheere R,Pf?nder J A.Testing the influence of high-voltage mineral liberation on grain size,shape and yield,and on fission track and40Ar/39Ar dating[J].Chemical Geology,2014,371(2):83-95.
[19]李志锋.辽宁低品位菱镁矿的综合利用研究[J].国土资源,2008(增刊1):78-79.Li Zhifeng.Study on comprehensive utilization of a low-grade magnesite ore from Liaoning[J].Land&Resources,2008(S1):78-79.
[20]赵正,白鸽,王登红,等.中国成菱镁矿区带与关键科学问题[J].地质学报,2014,88(12):2326-2338.Zhao Zheng,Bai Ge,Wang Denghong,et al.The metallogenic belts of Chinese magnesite deposits and key scientific issues[J].Acta Geologica Sinica,2014,88(12):2326-2338.
[21]Li Xiandong,Liu Yi,Zhou Guyue,et al.Study on underwater subsonic electrical discharges:streamer morphology and development[C]//19th IEEE International Conference on Dielectric Liquids(ICDL),Manchester,UK,2017:25-29.
[22]Yan Fazhi,Lin Baiquan,Zhu Chuanjie,et al.Experimental investigation on anthracite coal fragmentation by high-voltage electrical pulses in the air condition:effect of breakdown voltage[J].Fuel,2016,183:583-592.
[23]Yoshimi I,Shibayama A,Fujita T,et al.Liberation of materials by electrical disintegration for recycling[J].International Journal of the Society of Materials Engineering for Resources,2002,10(1):66-70.
[24]刘毅,李志远,李显东,等.水中脉冲激波对模拟岩层破碎试验[J].电工技术学报,2016,31(24):71-78.Liu Yi,Li Zhiyuan,Li Xiandong,et al.Experiments on the fracture of simulated stratum by underwater pulsed discharge shock waves[J].Transactions of China Electrotechnical Society,2016,31(24):71-78.
[25]李显东,刘毅,李志远,等.不均匀电场下水中脉冲放电观测及沉积能量对激波的影响[J].中国电机工程学报,2017,37(10):3028-3036.Li Xiandong,Liu Yi,Li Zhiyuan,et al.Observation of underwater pulse discharge and influence of deposited energy on shock wave in non-uniform electric field[J].Proceedings of the CSEE,2017,37(10):3028-3036.
[26]邓琦林,邵志勇,张雷,等.电水锤矿石粉碎的实验研究[J].机械工程师,1998(1):7-8.Deng Qilin,Shao Zhiyong,Zhang Lei,et al.Experimental study on the electrohydraulic comminution of ore[J].Mechaincal Engineer,1998(1):7-8.
[27]Singh V R,Lafaut J P,Wevers M,et al.Transient cavitation and associated mechanisms of stone disintegration[J].Innovation and Research in BioMedical Engineering,2000,21(1):14-22.
[28]Burkin V V,Kuznetsova N S,Lopatin V V.Wave dynamics of electric explosion in solids[J].Technical Physics,2009,54(5):644-650.
[29]李胜荣,许虹,申俊峰,等.结晶学与矿物学[M].北京:地质出版社,2008.
[30]Bluhm H,Frey W,Giese H,et al.Application of pulsed HV discharges to material fragmentation and recycling[J].IEEE Transactions on Dielectrics and Electrical Insulation,2000,7(5):625-636.
[31]刘明光,颜怀梁,温光一.电水锤效应及其应用[J].四川工业学院学报,1989,8(3):188-193.Liu Mingguang,Yan Huailiang,Wen Guangyi.Electrohydraulic effect and applications[J].Sichuan University of Science&Technology,1989,8(3):188-193.
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