磁流体强化复杂弱磁性矿高梯度磁选机理:竞争捕集向机械夹杂转化  

Mechanism of high-gradient magnetic separation of complex weakly magnetic minerals enhanced by ferrofluids:transformation of competitive trapping into mechanical entrainment

作　　者：杜力 刘妞 李双佳 王毓华[1] 卢东方[1] 郑霞裕[1] DU Li;LIU Niu;LI Shuangjia;WANG Yuhua;LU Dongfang;ZHENG Xiayu(School of Resources Processing and Bioengineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2024年第11期4090-4099,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51804341,52174270,52174267);“十四五”国家重点研发计划项目(2021YFC2903202)。

摘　　要：高梯度磁选是最为常用的处理弱磁性矿物的方式,但高梯度磁选中弱磁性有用矿物与弱磁性脉石之间因竞争捕集难以分离,精矿品位受到限制。为此,利用磁流体耦合高梯度磁选中产生的磁排斥力与弱磁性脉石矿物在磁场中受到的磁力相互抵消,将弱磁性矿物之间的竞争捕集转化为机械夹杂。研究结果表明:在磁感应强度为0.5 T、矿浆流速为0.06 m/s、脉动频率为2 r/s、磁流体质量分数为40%的条件下,与常规高梯度磁选磁性产物相比,TiO_(2)品位从33.07%提升至44.64%,且在高质量分数磁流体环境下,钛铁矿+辉石矿样与钛铁矿+石英矿样品位和捕集量变化规律相同,表明钛铁矿与辉石之间的竞争捕集已消除,解决了传统高梯度磁选中因竞争捕集导致磁选精矿品位较低的问题,具有广阔的应用前景。High-gradient magnetic separation(HGMS)is the most commonly used method to deal with weakly magnetic minerals,but the concentrate grade is limited due to the difficulty of separating weakly magnetic valuable and gangue minerals caused by competing capture.In order to solve these problems,the magnetic repulsion force generated by magnetic fluid was used to eliminate the magnetic force of the weakly magnetic gangue minerals in high-gradient magnetic separation coupling magnetic fluid(HGMSCMF),the competitive capture of weakly magnetic gangue minerals was transformed into mechanical entrainment of nonmagnetic minerals.The results show that compared with conventional high-gradient magnetic separation,TiO_(2) grade of magnetic products increases from 33.07%to 44.64%with MnCl2 solutions of 40%mass percentage fraction at magnetic induction of 0.5 T,flow velocity of 0.06 m/s and pulsating frequency of 2 r/s.The grade and quality regularity of ilmenite+augite ore samples with high magnetic fluid mass percentage fraction and ilmenite+quartz ore samples in water are the same,indicating the elimination of competitive capture between ilmenite and augite.HGMSCMF solves the problem of low concentrate grade caused by competitive capture in traditional high-gradient magnetic separation,and has broad application prospects.

关 键 词：高梯度磁选 磁流体 钛铁矿 竞争捕集 

分 类 号：TD924[矿业工程—选矿]