某浮选尾矿中铁矿物的磁化焙烧—弱磁选试验  

Experiment of Magnetization Roasting and Low Intensity Magnetic Separation of Iron in a Flotation Tailings

作　　者：梁居明 朱海龙[1] 王开扬[1] 李志明[2] LIANG Juming;ZHU Hailong;WANG Kaiyang;LI Zhiming(Hainan Mining Co.,Ltd.;School of Resources and Civil Engineering,Northeastern University)

机构地区：[1]海南矿业股份有限公司 [2]东北大学资源与土木工程学院

出　　处：《现代矿业》2022年第10期166-168,189,共4页Modern Mining

摘　　要：国内某选铁厂浮选尾矿强磁选预富集精矿铁品位为30.63%,主要杂质成分SiO_(2)含量为40.78%,主要有害成分磷和硫含量较低,赤褐铁、磁性铁、碳酸铁分别占总铁的62.79%、17.59%、12.23%。为高效回收其中的铁,进行了磁化焙烧—弱磁选工艺研究,结果表明,试样在总气量为600 mL/min、H_(2)浓度为20%、还原焙烧温度为520℃、还原时间为20 min情况下的焙烧熟料铁含量升高至33.00%,铁主要以磁性铁的形式存在,试样中的赤(褐)铁和碳酸铁大部分转变为了磁性铁;该熟料在磨矿细度为-600目占87.04%、磁场强度为119.43 kA/m情况下进行弱磁选,获得了铁品位为64.12%、回收率为71.81%的精矿,较好地实现了试样中铁的回收。High intensity magnetic separation preconcentration concentrate from flotation tailings of a domestic iron concentrator has an iron grade of 30.63%,and the content of main impurities SiO_(2) is 40.78%.The content of main harmful components like phosphorus and sulfur is low.Hematite-limonite,magnetic iron,carbonate iron accounts for 62.79%,17.59%,12.23%of the total iron,respectively.Magnetic roasting and low intensity magnetic separation process was studied in order to efficiently recover iron.The results showed that under the conditions of total gas volume of 600 mL/min,H_(2) concentration of 20%,reduction roasting temperature of 520℃and reduction time of 20 min,the iron content of roasted clinker increased to 33.00%,and iron mainly existed in the form of magnetic iron.Hematite-limonite and carbonate iron in the samples were mostly converted to magnetic iron.Under the condition of grinding fineness of-600 mesh accounting for 87.04%and magnetic field strength of 119.43 kA/m,low intensity magnetic separation was carried out.The iron concentrate with iron grade of 64.12%and recovery rate of 71.81%was obtained and iron recovery from the sample was well realized.

关 键 词：铁尾矿 磁化焙烧 弱磁选 高效回收 

分 类 号：TD926.4[矿业工程—选矿]