回转窑磁化焙烧细粒镜铁矿研究
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摘要
以细粒级镜铁矿为原料,采用电热回转窑进行磁化焙烧试验,研究了焙烧温度、焙烧时间、煤粉用量、煤粉粒度、窑体填充率对焙烧效果的影响。结果表明,在焙烧温度为830℃、焙烧时间为60 min、煤粉用量为2.0%、煤粉粒度为0~1 mm、磨矿细度-0.074 mm占85%、窑内填充率为15%、磁选磁场强度为144 kA/m的工艺条件下,得到铁品位为55.22%,回收率为87.16%的铁精矿指标。显微镜检测结果显示,大部分非磁性铁矿物已转化成磁性铁矿物,部分磁铁矿解离发育完全,颗粒变得疏松多孔,利于后续破碎、磨矿和磁选。
Fine-graded specularite was used to carry out magnetic roasting experiment with a laboratory e-lectric rotary kiln in order to investigate effects of roasting temperature, roasting time, carbon content andsize fraction, and charge ratio on roasting yield.The results showed that the process condition with roastingtemperature of 830 ℃, roasting time of 60 min, carbon powder(0~1 mm) content of 2.0%, charge ratioof 15%,grinding fineness(-0.074 mm)about 85% and magnetic field intensity of 144 kA/ m obtained oreconcentrate with Fe grade of 55.22% and iron recovery of 87.16%. Microscope detection results indicatedthat most of the nonmagnetic iron ore was converted into magnetite, and some magnetite was dissociativeand helpful for subsequent breaking, grinding and magnetic separation process.
Fine-graded specularite was used to carry out magnetic roasting experiment with a laboratory e-lectric rotary kiln in order to investigate effects of roasting temperature, roasting time, carbon content andsize fraction, and charge ratio on roasting yield.The results showed that the process condition with roastingtemperature of 830 ℃, roasting time of 60 min, carbon powder(0~1 mm) content of 2.0%, charge ratioof 15%,grinding fineness(-0.074 mm)about 85% and magnetic field intensity of 144 kA/ m obtained oreconcentrate with Fe grade of 55.22% and iron recovery of 87.16%. Microscope detection results indicatedthat most of the nonmagnetic iron ore was converted into magnetite, and some magnetite was dissociativeand helpful for subsequent breaking, grinding and magnetic separation process.
引文
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[7]Fu XiangHui,Mao Yongjun,Xue Shenghui.The research and prevention control of circle of Large industrial magnetizationroasting kiln[J].Nonferrous Metals Mieral Processing Section,2013(z1):236-239.(付向辉,毛拥军,薛生晖.大型工业磁化焙烧回转窑结圈研究及预防控制[J].有色金属,2013(z1):236-239.)
[8]Hu Yangjia,Zhang Yimin,Liu Tao,et al.Extraction of vanadium from stone coal by dynamic oxidizing roasting process with la-boratory electric rotary kiln[J].Ming and Metallurgical Engineering,2011,31(1):71-73.(胡杨甲,张一敏,刘涛,等.回转窑动态氧化焙烧石煤提钒研究[J].矿冶工程,2011,31(1):71-73.)
[2]Zhang Zhirong,Chen Zhou,Zhou Huahui,et al.The practice of improvingthe quality and production of magnetization roasting ofshaft furnace of theconcentrating and sinter plant of JISCO[J].Ming and Metallurgical Engineering,2012,32:121-123.(张志荣,陈洲,周华辉,等.酒钢选烧厂提高磁化焙烧竖炉产质量实践[J].矿冶工程,2012,32:121-123.)
[3]Ren Yafeng,Yu Yongfu.Present status and development orientation of magnetization roasting technology for refractory red ironores[J].Metal Mine,2005(11):20-21.(任亚峰,余永富.难选红铁矿磁化焙烧技术现状及发展方向[J].金属矿山,2005(11):20-21.)
[4]Zhang Yimin.The separation theory and technology of solid material[M].Beijing:Metallurgical Industry Press,2007:166-167.(张一敏.固体物料分选理论与工艺[M].北京:冶金工业出版社,2007:166-167.)
[5]Xiao Junhui,Zhang Yu.Experimental study on rotary magnetic roasting for a high-phosphorus oolitic hematite and limonite ore[J].Metal Mine,2010(3):43-47.(肖军辉,张昱.某鲕状高磷赤、褐铁矿回转窑磁化焙烧试验研究[J].金属矿山,2010(3):43-47.)
[6]Xue Shenghui,Zhang Zhihua,Guo Yongnan,et al.The research status of magnetization roasting technology of siderite andlimo-nite with rotary kiln[J].Ming and Metallurgical Engineering,2012,32:42-45.(薛生晖,张志华,郭永楠,等.菱褐铁矿回转窑磁化焙烧技术研究现状[J].矿冶工程,2012,32:42-45.)
[7]Fu XiangHui,Mao Yongjun,Xue Shenghui.The research and prevention control of circle of Large industrial magnetizationroasting kiln[J].Nonferrous Metals Mieral Processing Section,2013(z1):236-239.(付向辉,毛拥军,薛生晖.大型工业磁化焙烧回转窑结圈研究及预防控制[J].有色金属,2013(z1):236-239.)
[8]Hu Yangjia,Zhang Yimin,Liu Tao,et al.Extraction of vanadium from stone coal by dynamic oxidizing roasting process with la-boratory electric rotary kiln[J].Ming and Metallurgical Engineering,2011,31(1):71-73.(胡杨甲,张一敏,刘涛,等.回转窑动态氧化焙烧石煤提钒研究[J].矿冶工程,2011,31(1):71-73.)