贫赤铁矿高压辊磨产品湿式预选研究  

Wet Pre-concentration of Comminuted Products by High-Pressure Grinding Roller for Lean Hematite

作　　者：刘磊[1] 袁致涛[1] 韩跃新[1] 吕雪芳[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2012年第1期128-132,共5页Journal of Northeastern University(Natural Science)

基　　金：中央高校基本科研业务费专项资金资助项目(N100401007);教育部新世纪优秀人才支持计划项目(NCET-10-0308)

摘　　要：采用柱状磁介质研究了介质棒间隙、直径及背景磁场强度对贫赤铁矿高压辊磨产品湿式强磁预选效果的影响,并对磁场中不同直径的单矿物颗粒进行了受力分析.研究表明:减小介质棒间隙、增加介质棒直径和提高背景磁场强度均能降低预选尾矿的品位和产率,提高回收率.在同一背景磁场强度下,随着直径的增加,介质棒对粗颗粒的捕收磁力增加,对细颗粒的捕收磁力减小;对于实际连生体矿粒,考虑到矿粒重力和黏滞阻力的影响,增大介质棒直径在有利于粗矿粒捕收的同时并不影响细矿粒的捕收;减小介质棒直径有利于细矿粒的捕收,但对粗贫连生体矿粒的捕收能力下降.The pre-concentration of comminuted products by high-pressure grinding roller for lean hematite was studied, using the cylindrical ferromagnetic medium. The effects of various factors including rod diameter, rod gap and background magnetic field intensity （BMFI）, on indexes of pre-concentration were emphatically investigated and the force analysis of single mineral particles with different diameters in the separation zone was done. The results showed that as rod gap decreased, rod diameter and BMFI increased, the tailings grade and the railings yield are reduced, but the Fe recovery is increased. Under the same BMFI, the magnetic capturing force increases on the coarse particles and decreases on the fine particles with the rod diameter increasing. For the actual locked particles, considering the gravity and viscous resistance of particles, the increase of rod diameter is beneficial for the capture of coarse particles but has no influence on the capture of fine particles, while the decrease of rod diameter is good for the capture of fine particles but bad for the capture of coarse particles of lean intergrowth.

关 键 词：贫赤铁矿 高压辊磨 强磁选 预选 磁捕收力 

分 类 号：TD451[矿业工程—矿山机电]