摘要
An innovative technology of high-voltage pulse discharge(HVPD)was proposed to investigate the comminution characteristics of galena ore.The optimal experiment parameters were determined as follows:spark gap spacing of 25 mm,pulse number of 120,and voltage of 25 k V.The mass fraction with size<0.074 mm in ground products was improved by the HVPD.Meanwhile,the relative grindability declined with the increase of the grinding time,which indicated that the superiority of HVPD was weakened.The ground products of HVPD were distributed more homogeneously than those of mechanical crushing.The liberation of breakage products was improved by 24.57%via the HVPD.Moreover,the Brunauer–Emmett–Teller(BET)specific surface area,pore volume,and average pore size were increased via the HVPD.Scanning electron microscopy(SEM)and energy-dispersive X-ray spectroscopy(EDS)analyses suggested that obvious grain-boundary breakage and several stomatal traces were observed in the HVPD products.
为研究方铅矿的粉碎特性,提出一种高压脉冲放电(HVPD)新技术。其最优的实验参数如下:火花隙间距25 mm、脉冲数120、电压25 kV。高压电脉冲提高研磨产品中粒度小于0.074 mm的质量分数。同时,随着研磨时间的延长,相对可磨性下降,说明HVPD的优越性减弱。高压电脉冲粉碎产物比机械粉碎产物分布均匀。高压电脉冲使破碎产物的单体解离度提高24.57%。此外,采用高压电脉冲粉碎产品的BET比表面积、孔体积和平均孔径得到提高。扫描电镜(SEM)和X射线能谱(EDS)分析表明,高压电脉冲产物中存在明显的晶界断裂和气孔痕迹。
基金
financial supports from the National Natural Science Foundation of China(No.51974063)
the Fundamental Research Funds for the Central Universities of China(No.N180104016)
the China Postdoctoral Science Foundation(No.2020M670783)。
