海砂矿球磨微观解离与细粒级磁选受力分析  

Ball-Milling Micro-dissociation of Ironsand and Magnetic Force at Fine Level

作　　者：王振阳[1] 张建良[1] 刘征建[1] 张路明[2] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]唐山国丰钢铁有限公司,河北唐山063300

出　　处：《东北大学学报（自然科学版）》2016年第5期711-715,共5页Journal of Northeastern University(Natural Science)

基　　金：国家科技支撑计划项目(2011BAC01B02);国家重点基础研究发展计划项目(2012CB720401)

摘　　要：为拓宽铁矿石来源,提高海砂品位以应用于长流程炼铁系统,对一种印尼海砂矿进行了球磨磁选实验,并利用X射线衍射(XRD)、扫描电镜(SEM)以及激光粒度分析(LPSA)等方法,研究了其在不同球磨阶段的微观解离特点、粒度与磁感应强度对精矿品位与回收率的影响以及细粒级下磁选过程中的受力机理.结果表明:球磨至一定阶段后,矿石粒度已较小,连生体基本以包裹体形式存在,很难继续解离,故此时继续降低矿石粒度对精矿品位的提升意义不大;另外,当矿石较细时,水阻力将成为磁选过程中的主要作用力,细粒级矿粒将不能到达磁鼓表面,故此时精矿回收率较低.To broaden the iron ore sources and raise the grade of ironsand for long process ironmaking system, the ball-milling and magnetic separation were conducted on a ironsand from Indonesia. The analysis methods of X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and laser particle size analyzer （LPSA） were used to investigate the micro-dissociation characteristics in different ball-milling stages, the influence of particle size and magnetic induction intensity on the concentrate grade and recovery and the force mechanism of fine ironsand in the process of magnetic separation. After the ball-milling to a certain stage, the granularity of ironsand is small and the locked mineral is in the form of inclusions which is hard to continue to disintegrate. Therefore, it makes little sense to reduce the ironsand granularity for the promotion of concentrate grade. In addition, when the ore is fine, water resistance will become the main force in the process of magnetic separation and the fine particles will not be able to reach the surface of the drum, and lead to a lower concentrate recovery rate.

关 键 词：海砂矿 解离 磁选 细粒级 受力机理 

分 类 号：TD924[矿业工程—选矿]