海南某褐铁矿石还原焙烧—磁选试验  

Research on Reduction Roasting and Magnetic Separation of Limonite Ore in Hainan Province

作　　者：柳林[1,2,3,4] 王威 刘红召[1,2,3,4] 曹耀华 张博[1,2,3,4] 王洪亮[1,2,3,4] Liu Lin;Wang Wei;Liu Hongzhao;Cao Yaohua;Zhang Bo;Wang Hongliang(Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,Chinese Academy of Geological Sciences,Zhengzhou 450006,China;China National Engineering Research Center for Utilization of Industrial Minerals,Zhengzhou 4-50006,China;Key Laboratory of Gold Resource Comprehensive Utilization in Henan Province,Zhengzhou 450006,China;Key Laboratory of Polymetallic Ore Evaluation and Comprehensive Utilization,Ministry of Land and Resources,Zhengzhou 450006,China)

机构地区：[1]中国地质科学院郑州矿产综合利用研究所,河南郑州450006 [2]国家非金属矿资源综合利用工程技术研究中心,河南郑州450006 [3]河南省黄金资源综合利用重点实验室,河南郑州450006 [4]国土资源部多金属矿评价与综合利用重点实验室,河南郑州450006

出　　处：《金属矿山》2018年第9期99-102,共4页Metal Mine

基　　金：河南省科技攻关项目(编号:182102311075);中国地质调查局地质调查项目(编号:121201017000160907)

摘　　要：海南某低硫、磷褐铁矿石铁品位为39.28%,主要组成矿物褐铁矿含量占73.86%,主要脉石矿物石英含量占14.94%。矿石中褐铁矿粒度较细,多呈不规则状和鲕状集合体,且有包裹细粒石英的现象,这种复杂的嵌布关系大大增大的铁矿物的回收难度。为确定该矿石的高效开发利用工艺,进行了加工工艺条件研究。结果表明,矿石(-0.074 mm占98%)与焦煤(-0.074 mm占98%)混合造球后经焙烧—磨矿—弱磁选工艺处理,在焦煤用量为15%,焙烧温度为1 200℃,焙烧时间为60 min,焙烧产品磨矿细度为-0.045 mm占66%,弱磁选磁场强度为88 k A/m情况下,获得了铁品位为92.54%、铁回收率为74.19%的铁精矿。造球焙烧—磨矿—弱磁选工艺是实现该资源高效开发利用的有效工艺。The iron grade of a low sulfur and phosphorous lignite ore from Hainan Province is 39.28%,and the mineral content of lignite is 73.86%,quartz is the main gangue mineral with content of 14.94%. Limonite has a fine grain size,which is usually irregular and oolitic assemblages,and contains fine quartz. This complex inlay relationship greatly increases the difficulty of iron ore recovery. In order to determine the efficient development and utilization technology of the ore,the processing conditions were studied. The results show that with coking coal（-0.074 mm占98%） as reducing agent,the reduction roasting-grinding-low intensity magnetic separation process was adopted to recycle iron. The optimum conditions were as follows：the mixture was roasted at 1 200 ℃ for 60 minutes with coal consumption 15%,and then ground to-0.045 mm accounted for66%,with low intensity magnetic field intensity 88 k A/m. As the conditions,the total iron grade of iron concentrate was92.54% and the total iron recovery was 74.19%. Pelletizing roasting-grinding-low intensity magnetic separation is an effective process to realize the efficient development and utilization of limonite ore.

关 键 词：褐铁矿石 还原焙烧 磨矿 弱磁选 

分 类 号：TD925.7[矿业工程—选矿]