高压脉冲放电破碎菱镁矿石的实验研究

Experimental Study on Fragmentation of Magnesite Ores by Pulsed High-Voltage Discharge

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 6cm and 8cm in diameter,were respectively processed at.25kV.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 150μm 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.