磁化处理对微细粒赤铁矿絮凝的影响  

Effect of Magnetization Treatment on Flocculation of Fine Grained Hematite

作　　者：李艾强 周文波[1,2,3] 李青青 华绪钦 LI Aiqiang;ZHOU Wenbo;LI Qingqing;HUA Xuqin(College of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education,Wuhan University of Science and Technology,Wuhan 430081,China;Ironmaking Plant of Wuhan Iron and Steel Co.,Ltd,Wuhan 430083,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081 [3]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081 [4]武汉钢铁有限公司炼铁厂,湖北武汉430083

出　　处：《矿产保护与利用》2018年第1期84-90,共7页Conservation and Utilization of Mineral Resources

基　　金：湖北省教育厅重点项目(D20121106);冶金矿产资源高效利用与造块湖北省重点实验室开放基金项目(MREU201607);钢铁冶金及资源利用省部共建教育部重点实验室开放基金项目(FMRU201001)

摘　　要：以赤铁矿纯矿物作为研究对象,通过沉降试验来考察不同方式的磁化处理作用对赤铁矿絮凝沉降行为的影响。结果表明:矿浆和药剂在经过磁化处理后,絮凝效果明显优于未经过磁化处理的絮凝效果,且磁场强度越高絮凝效果越好;在矿浆磁化和药剂磁化为60 min时赤铁矿沉降率达到最大值,分别为73.9%和72.7%,磁化矿浆比磁化药剂对赤铁矿絮凝的效果好;磁化矿浆和磁化药剂两种不同磁化处理方式下的赤铁矿颗粒Zeta电位测量结果表明,磁化处理会改变赤铁矿颗粒的Zeta电位,分别从-50.765 m V减小至-43.538 m V和-44.006 m V;磁化处理降低了赤铁矿颗粒间双电层排斥力,降低颗粒间的势能垒,使赤铁矿颗粒更易于聚团,絮凝效果增强;赤铁矿与淀粉红外光谱研究结果表明,赤铁矿与淀粉分子间存在着化学吸附和氢键作用。Taking pure hematite minerals as the research object,the sedimentation test was conducted to investigate the influence of magnetization treatment on flocculation sedimentation of hematite.The results showed that the flocculation performance of the treated pulp and reagent with magnetization was obviously better than that of the non-magnetized pulp,which was also increased with magnetic field strength.When the magnetization time of the slurry and the magnetization of the agent was 60 min,the hematite sedimentation rate reached the maximum at 73.9%and 72.7%,respectively,which indicated the effect of magnetized slurry on the flocculation of hematite was more obvious that of magnetized reagent.The results of Zeta potential measurements showed that magnetized pulp and magnetized reagent changed the Zeta potential of hematite from-50.765 mV to-43.538 mV and-44.006 mV,respectively.Magnetization reduced the repulsive force of the electric double layer between the hematite particles and reduced the potential barrier between the particles,making the hematite particles more agglomerated and enhancing flocculation performance.Results of hematite and starch infrared spectroscopy demonstrated that there are chemical adsorption and hydrogen bonding between hematite and starch molecules.

关 键 词：赤铁矿 磁化处理 絮凝 ZETA电位 

分 类 号：TD951.1[矿业工程—选矿]