四川某低品位弱磁性铁矿脉动高梯度磁选试验研究  

Experimental Study on Pulsating High Gradient Magnetic Separation of a Low-grade Weakly Magnetic Iron Ore in Sichuan

作　　者：李琛 王大骞 洪森 洪杨 LI Chen;WANG Daqian;HONG Sen;HONG Yang(State Key Laboratory of Comprehensive Utilization of Nickel and Cobalt Resources,Jinchuan Nickel Cobalt Research&Design Institute Co.,Ltd.,Jinchang 737100,Gansu,China;School of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China;Henan Institute of Technology,Xinxiang 453003,Henan,China;College of Chemical Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]金川镍钴研究设计院镍钴资源综合利用国家重点实验室,甘肃金昌737100 [2]福州大学材料科学与工程学院,福州350108 [3]河南工学院,河南新乡453003 [4]福州大学石油化工学院,福州350108

出　　处：《有色金属（选矿部分）》2024年第8期93-98,共6页Nonferrous Metals（Mineral Processing Section）

基　　金：国家自然科学基金资助项目(83420083)。

摘　　要：四川某铁矿石原矿铁品位较低为25.40%,硅酸铁分布率达55.04%,可利用的铁矿物以赤铁矿、褐铁矿等弱磁性矿物为主,理论回收率为44.06%。由于铁矿物嵌布粒度细,回收利用难度大,综合考虑经济成本和技术可行性,拟定了“磨矿—脉动高梯度磁选粗选—粗精矿再磨—脉动高梯度磁选精选”的技术路线分选该矿石。通过脉动高梯度磁选粗选条件试验着重考察了磨矿细度、磁感应强度、脉动频率和矿浆流速对粗选结果的影响,确定了最佳粗选条件为:原矿磨矿细度-0.074mm粒级占80%、磁感应强度0.6T、脉动频率250r/min、矿浆流速6cm/s,在此条件下粗选可获得铁品位34.97%、回收率67.74%的粗精矿;为进一步提高粗精矿铁品位,对粗精矿再磨后进行精选,在粗精矿再磨细度-0.038mm粒级占97.16%、磁感应强度0.4T、脉动频率350r/min、矿浆流速8cm/s的条件下,可获得铁品位41.08%、回收率37.40%的精矿产品。在上述最佳分选条件下,经过“一粗一精”开路磁选工艺流程,所得精矿产品铁品位由25.40%提升至41.08%,提升幅度较大,铁回收率37.40%接近理论回收率,有害元素S、P和As含量较低,满足了对精矿产品的质量要求,选别指标理想。采用脉动高梯度磁选工艺选别该类铁矿石,选别工艺简单、分选指标好,为低品位、弱磁性铁矿石的回收利用提供了有效的分选方案。An iron ore in Sichuan has a low iron grade of 25.40%,the distribution rate of iron silicate is as high as 55.04%,and the available iron minerals are dominated by weakly magnetic minerals such as hematite and limonite,with a theoretical recovery of 44.06%.Due to the fine particle size of iron mineral embedded,it is difficult to recover and utilize.Considering economic cost and technical feasibility,the study formulated the technical route of"grinding'-pulsating high gradient magnetic separation roughing-rough concentrate regrinding-pulsating high gradient magnetic separation cleaning"to sort the ore,Through the test of pulsation high gradient magnetic separation roughing conditions,the effect of grinding fineness,magnetic induction strength,pulsation frequency and pulp flow rate on the results of roughing was investigated,and the optimal roughing conditions were determined as follows:the grinding fineness of the raw ore-0.074 mm grain size accounting for 80%,magnetic induction strength 0.6 T,pulsation frequency 250 r/min,pulp flow rate 6 cm/s.Under these conditions,a rough concentrate with iron grade of 34.97%and recovery of 67.74%can be obtained by roughing.In order to further improve the iron grade of the rough concentrate,the rough concentrate underwent regrinding and then cleaning,in the rough concentrate grinding fineness-0.038 mm particle size accounting for 97.16%,the magnetic induction strength of 0.4 T,pulsation frequency 350 r/min,pulp flow rate of 8 cm/s conditions,a concentrate product with an iron grade of 41.08%and a recovery of 37.40%could be obtained.Under the above optimal sorting conditions,after the"one roughing and one cleaning"open-circuit magnetic separation process,the iron grade of the obtained concentrate product was increased from 25.40%to 41.08%,with a large increase,the iron recovery of 37.40%was close to the theoretical recovery,and the content of harmful elements S,P and As was low,which meets the quality requirements for the concentrate products,and the separation index is ideal.Ado

关 键 词：脉动高梯度磁选 低品位弱磁性铁矿 粗精矿再磨 

分 类 号：TD951[矿业工程—选矿]