关键词: 高压电脉冲技术, 方铅矿石, 粒度分布, 破碎比, 粒度分布均匀性, 微观形貌

Abstract: High-voltage electrical pusles technology is a novel grain boundary fracture technology,which has the advantages of selective crushing,less pollution and no dust. In order to further improve the technical system of high-voltage electric pulses pretreatment technology system,high-voltage electric pulse pretreatment test was carried out for a galena in Liaoning Province. The influence of parameters such as ball gap spacing,output voltage and pulse times on ore crushing effect was systematically investigated. The results showed that the suitable high-voltage electric pulse pretreatment conditions for 7 ~ 5 mm, 10~ 7 mm,12. 5~ 10 mm grain size raw materials were as follows:ball gap spacing of 25 mm,output voltage of 25 kV,pulse times of 150 times,in which the grain size yield of -2 mm crushing product was the highest,and the average crushing ratio and particle size distribution uniformity coefficient were the best. In addition,the particle size distribution coefficient is better with the finer feed particle size,indicating the wider the particle size distribution range and the worse the product particle size uniformity. The particle size of ore is reduced mainly through the impact shear force to achieve the dissociation of mineral in mechanical crushing. However,for the high-voltage electrical pusles crushing technology,the internal structure of the ore is destroyed by the difference of dielectric constant,and a large number of cracks and micro-cracks are generated at the phase interface,which contribute to the further dissociation and fragmentation of the ore.