离心高梯度磁选工业机精选细粒钛铁矿的试验研究  

Experimental Study on the Separation of Fine Ilmenite by Centrifugal High Gradient Magnetic Separator

作　　者：李敬[1] 官长平 任祥君 曾剑武 熊涛 徐国印 陈禄政[1] LI Jing;GUAN Changping;REN Xiangjun;ZENG Jianwu;XIONG Tao;XU Guoyin;CHEN Luzheng(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Panzhihua Chirui Mining and Metallurgical Technology Co.,Ltd.,Panzhihua 617000,Sichuan,China;SLon Magnetic Separator Ltd.,Ganzhou 341000,Jiangxi,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]攀枝花驰瑞矿冶科技有限公司,四川攀枝花617000 [3]赣州金环磁选设备有限公司,江西赣州341000

出　　处：《中国钨业》2020年第4期26-32,共7页China Tungsten Industry

基　　金：国家自然科学基金项目(51874152);四川省科技计划资助项目(2018GZYZF0057);四川省重大装备创新研制与产业化项目(2014ZZ0059)

摘　　要：离心高梯度磁选新方法具有高梯度磁选捕获力强和离心分选精度高的优点。研究选用一台新研制的离心高梯度磁选工业机,用于精选细粒钛铁矿强磁选粗精矿的试验研究,分析主要技术参数对分选指标的影响。结果表明,对生产现场选取的钛粗精矿(TiO2品位17.77%,-0.074 mm占60.34%),在磨矿细度-0.074 mm占78.36%、磁感应强度0.4 T、3.0 mm磁介质、磁介质转速225 r/min和矿浆流速16.8 L/min条件下,新型离心高梯度磁选机一次精选可以得到TiO2品位和回收率分别为29.65%和61.70%的钛精矿;将磁感应强度和矿浆流速分别提高至0.6 T和21.0 L/min,钛精矿TiO2品位和回收率分别达到26.29%和80.41%。该分选指标与生产现场脉动高梯度磁选精选作业钛精矿品位(约21%TiO2)比较,离心高梯度磁选新方法的选择性明显更高,但TiO2回收率更低。该离心高梯度磁选新方法为细粒弱磁性矿深度精选提供了一种新思路。Centrifugal high gradient magnetic separation(CHGMS)has the advantages of strong capture and high selectivity to weakly magnetic minerals.In this investigation,a full-scale new CHGMS separator was used to clean a primary ilmenite concentrate,to investigate the effects of key operating parameters of the separator on its separation performance.The separation results indicate that,for the primary concentrate(assaying 17.77%TiO2 and 60.34%below 0.074 mm)picked from the production site of pulsating HGMS roughing process,the CHGMS separator produced a high-grade ilmenite concentrate assaying 29.65%TiO2 with 61.70%recovery,under the conditions of grinding fineness of 78.36%below 0.074 mm,magnetic induction of 0.4 T,3.0 mm cylindrical matrix,matrix rotation speed of 225 r/min and slurry flow rate of 16.8 L/min;when the magnetic induction and slurry flow rate were respectively increased to 0.6 T and 21.0 L/min,the TiO2 grade of ilmenite concentrate reached 26.29%with 80.41%recovery.The separation selectivity of this CHGMS separator is much higher than that of a pulsating HGMS separator operating on the production site,as it may effectively separate out more magnetic intergrowths and gangue minerals entrained in the magnetic concentrate,thereby providing a new technological idea for the separation of fine weakly magnetic ores.

关 键 词：离心高梯度磁选 工业试验 钛铁矿 精选 

分 类 号：TD455.4[矿业工程—矿山机电] TD457