海南某褐铁矿石还原焙烧—磁选试验
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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.
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.
引文
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[3]韩跃新,孙永升,李艳军,等.我国铁矿选矿技术最新进展[J].金属矿山,2015(2):1-11.Han Yuexin,Sun Yongsheng,Li Yanjun,et al.New development on mineral processing technology of iron ore resources in China[J].Metal Mine,2015(2):1-11.
[4]左倩.微细粒赤铁矿分散行为及机理研究[D].武汉:武汉科技大学,2012.Zuo Qian.Study on Behaviors and Mechanism of Dispersion of hematite fines[D].Wuhan:Wuhan University of Science and Technology,2012.
[5]谢兴中,王毓华.褐铁矿选矿研究现状与思考[J].金属矿山,2010(1):6-10.Xie Xinzhong,Wang Yuhua.Current situation and thinking of mineral processing technique on limonite ore[J].Metal Mine,2010(1):6-10.
[6]沈远海.新钢铁坑褐铁矿直接还原焙烧过程研究[D].赣州:江西理工大学,2013.Shen Yuanhai.Study on The Direct Reduction Roasting Process of New Iron Iron Pit Limonite[D].Ganzhou:Jiangxi University of Science and Technology,2013.
[7]孙永升,李淑菲,史广全,等.某鲕状赤铁矿深度还原试验研究[J].金属矿山,2009(5):80-83.Sun Yongsheng,Li Shufei,Shi Guangquan,et al.Reseach on deep reduction of an oolitic hematite[J].Metal Mine,2009(5):80-83.
[8]赵庆杰,魏国,沈峰满.直接还原技术进展及其在中国的发展[J].鞍钢技术,2014(4):1-6.Zhao Qingjie,Wei Guo,Shen Fengman.Process of direct reduce technology and its development in China[J].Angang Technology,2014(4):1-6.
[9]张亚辉,张家,张艳娇,等.鲕状赤铁矿“磁化焙烧-晶粒长大-磁选”新工艺研究[J].武汉理工大学学报,2013(3):116-119.Zhang Yahui,Zhang Jia,Zhang Yanjiao,et al.Magnetizing roastinggrain growth-magnetic separation process for oolitic hematite ore dressing[J].Journal of Wuhan University of Technology,2013(3):116-119.
[10]刘红召,王威,王守敬,等.七宝山铁尾矿还原焙烧-弱磁选回收铁试验[J].金属矿山,2014(9):172-176.Liu Hongzhao,Wang Wei,Wang Shoujing,et al.Iron recovery from Qibaoshan iron ore tailing by reduction roasting-magnetic separation process[J].Metal Mine,2014(9):172-176.