MgO含量及来源对磁铁精矿球团固结行为的影响
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摘要
对普通磁铁矿球团、高镁磁铁矿球团和普通磁铁矿配加MgO粉的球团固结行为进行研究,考察MgO含量(质量分数)及来源对球团固结行为的影响。研究结果表明:当焙烧温度低于1 210℃时,MgO来源对焙烧球团抗压强度影响显著,表现为普通磁铁矿焙烧球团抗压强度最高,高镁磁铁矿球团次之,普通磁铁矿配加MgO粉球团抗压强度最低。当焙烧温度高于1 240℃时,MgO含量对焙烧球团抗压强度影响较大,焙烧球团抗压强度随MgO含量的增加而降低;在MgO含量相同条件下,高镁磁铁矿球团强度高于配加MgO粉球团。来源不同的MgO均抑制磁铁矿球团氧化和新生物相的分布,从而影响了球团的固结强度。矿化是配加MgO粉球团固结的限制性环节,提高焙烧温度有助于强化外加MgO粉的矿化并减弱MgO来源的影响,进而提高焙烧球团强度。
Three different kinds of pellets(common magnetite pellet, magnetite with high MgO content pellet and magnetite pellet adding MgO powder) were studied to investigate the effect of MgO content and sources on induration behavior of pellets. The results show that MgO sources have a great influence on the compressive strength of fired pellets when fired temperature is below 1 210 ℃, and the compressive strength of common magnetite pellets are maximal, followed by the pellets made of magnetite with high MgO content, and the pellets adding MgO powder are minimum. The MgO content has greater effect on the compressive strength of fired pellets when fired temperature is above 1 240 ℃, and the compressive strength decreases with the increase of MgO content. Meanwhile, the strength of fired pellets composed by magnetite with high MgO content is higher at the same level of MgO content. Induration mechanism research shows that MgO affects not only the pellets oxidation but also new phase distribution. As a result, it influences the compressive strength of pellets. The mineralization is the restricted factor for pellets adding MgO powder. Higher roasted temperature is conducive to strengthening MgO powder mineralization and weakening the influence of MgO sources, leading to the high compressive strength.
Three different kinds of pellets(common magnetite pellet, magnetite with high MgO content pellet and magnetite pellet adding MgO powder) were studied to investigate the effect of MgO content and sources on induration behavior of pellets. The results show that MgO sources have a great influence on the compressive strength of fired pellets when fired temperature is below 1 210 ℃, and the compressive strength of common magnetite pellets are maximal, followed by the pellets made of magnetite with high MgO content, and the pellets adding MgO powder are minimum. The MgO content has greater effect on the compressive strength of fired pellets when fired temperature is above 1 240 ℃, and the compressive strength decreases with the increase of MgO content. Meanwhile, the strength of fired pellets composed by magnetite with high MgO content is higher at the same level of MgO content. Induration mechanism research shows that MgO affects not only the pellets oxidation but also new phase distribution. As a result, it influences the compressive strength of pellets. The mineralization is the restricted factor for pellets adding MgO powder. Higher roasted temperature is conducive to strengthening MgO powder mineralization and weakening the influence of MgO sources, leading to the high compressive strength.
引文
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[15]FAN Xiaohui,GAN Min,JIANG Tiao,et al.Influence of flux additives on iron ore oxidized pellets[J].Journal of Central South University of Technology,2010,17(4):732-737.
[16]范晓慧,谢路奔,甘敏,等.高镁球团焙烧特性及其固结强化机理[J].中南大学学报(自然科学版),2013,44(2):449-455.FAN Xiaohui,XIE Luben,GAN Min,et al.Roasting characteristics of magnesium pellets and mechanism of strengthening concretion[J].Journal of Central South University(Science and Technology),2013,44(2):449-455.
[17]宋招权.磁铁精矿球团氧化动力学及竖炉热工制度的研究[D].长沙:中南大学资源加工与生物工程学院,2000:19-25.SONG Zhaoquan.Research on oxidation kinetics of magnetite pellet and shaft-kiln operating parameter[D].Changsha:Central South University.School of Minerals Processing and Bioengineering,2000:19-25.
[18]高强健,魏国,何奕波,等.MgO对球团矿抗压强度的影响[J].东北大学学报(自然科学版),2013,34(1):103-106.GAO Qiangjian,WEI Guo,HE Yibo,et al.Effect of MgO on compressive strength of pellet[J].Journal of Northeastern University(Natural Science),2013,34(1):103-106.
[19]傅菊英,姜涛,朱德庆.烧结球团学[M].长沙:中南工业大学,1996:286-302.FU Juying,JIANG Tao,ZHU Deqing.Principle of sintering and pelletizing[M].Changsha:Central South University of Technology Press,1996:286-302.
[2]王筱留.钢铁冶金学:炼铁部分[M].北京:冶金工业出版社,2008:72-75.WANG Xiaoliu.Iron and steel metallurgy:iron part[M].Beijing:Metallurgical Industry Press,2008:72-75.
[3]吴胜利,韩宏亮,姜伟忠,等.烧结矿中MgO作用机理[J].北京科技大学学报,2009,31(4):428-432.WU Shengli,HAN Hongliang,JIANG Weizhong,et al.MgO interaction mechanism in sinter[J].Journal of University of Science and Technology Beijing,2009,31(4):428-432.
[4]黄柱成,韩志国,江源,等.MgO对以细磁铁精矿为主的低硅烧结的影响[J].中南大学学报(自然科学版),2005,36(5):800-806.HUANG Zhucheng,HAN Zhiguo,JIANG Yuan,et al.Influence of MgO on sinter mainly made from fine magnetite concentrate[J].Journal of Central South University(Science and Technology),2005,36(5):800-806.
[5]DWARAPUDI S,GHOSH T K,SHANKAR A,et al.Effect of pellet basicity and MgO content on the quality and microstructure of hematite pellets[J].International Journal of Mineral Processing,2011,99(1/2/3/4):43-53.
[6]DWARAPUDI S,GHOSH T K,SHANKAR A,et al.Effect of pyroxenite flux on the quality and microstructure of hematite pellets[J].International Journal of Mineral Processing,2010,96(1/2/3/4):45-53.
[7]陈耀铭,陈锐.烧结球团矿微观结构[M].长沙:中南大学出版社,2011:121-122,124-125.CHENG Yaoming,CHEN Rui.Microstructure of sinter and pellet[M].Changsha:Central South University Press,2011:121-122,124-125.
[8]姜鑫,吴钢生,李光森,等.改善含MgO铁矿石软熔性能的研究[J].东北大学学报(自然科学版),2007,28(3):365-368.JIANG Xin,WU Gangsheng,LI Guangsen,et al.Study on improving the softening-melting properties of MgO-bearing iron ores[J].Journal of Northeastern University(Natural Science),2007,28(3):365-368.
[9]GAO Qiangjian,SHENG Fengman,WEI Guo,et al.Effects of MgO containing additive on low-temperature metallurgical properties of oxidized pellet[J].Journal of Iron and Steel Research International,2013,20(7):25-28.
[10]张汉泉.熔剂性球团的生产及发展[J].中国矿业,2009,18(4):89-92.ZHANG Hanquan.Production and development of fluxed pellet[J].China Mining Magazine,2009,18(4):89-92.
[11]张晓萍,金俊,覃德波.马钢生产镁质球团矿的可行性研究[J].烧结球团,2010,35(5):16-19.ZHANG Xinping,JIN Jun,QING Debo.Feasibility study on MgO-containing pellet production in masteel[J].Sintering and Pelletiziing,2010,35(5):16-19.
[12]李圣辉,陈铁军,张一敏,等.含镁添加剂用于铁矿球团的试验研究[J].烧结球团,2011,36(1):33-37.LI Shenghui,CHEN Tiejun,ZHANG Yimin,et al.Experimental study on application of Mg-bearing additives in iron ore pellet[J].Sintering and Pelletizing,2011,36(1):33-37.
[13]周明顺,沈峰满,翟立委,等.MgO添加方式对改善球团矿冶金性能的影响[J].钢铁,2012,47(4):14-18.ZHOU Mingshun,SHENG Fengman,ZHAI Liwei,et al.Influences of MgO adding method on improving metallurgical properties of pellet[J].Iron and Steel,2012,47(4):14-18.
[14]甘敏,范晓慧,陈许玲,等.钙和镁添加剂在氧化球团中的应用[J].中南大学学报(自然科学版),2010,41(5):1645-1651.GAN Min,FAN Xiaohui,CHEN Xuling,et al.Application of Ca,Mg-additives in oxidized pellets[J].Journal of Central South University(Science and Technology),2010,41(5):1645-1651.
[15]FAN Xiaohui,GAN Min,JIANG Tiao,et al.Influence of flux additives on iron ore oxidized pellets[J].Journal of Central South University of Technology,2010,17(4):732-737.
[16]范晓慧,谢路奔,甘敏,等.高镁球团焙烧特性及其固结强化机理[J].中南大学学报(自然科学版),2013,44(2):449-455.FAN Xiaohui,XIE Luben,GAN Min,et al.Roasting characteristics of magnesium pellets and mechanism of strengthening concretion[J].Journal of Central South University(Science and Technology),2013,44(2):449-455.
[17]宋招权.磁铁精矿球团氧化动力学及竖炉热工制度的研究[D].长沙:中南大学资源加工与生物工程学院,2000:19-25.SONG Zhaoquan.Research on oxidation kinetics of magnetite pellet and shaft-kiln operating parameter[D].Changsha:Central South University.School of Minerals Processing and Bioengineering,2000:19-25.
[18]高强健,魏国,何奕波,等.MgO对球团矿抗压强度的影响[J].东北大学学报(自然科学版),2013,34(1):103-106.GAO Qiangjian,WEI Guo,HE Yibo,et al.Effect of MgO on compressive strength of pellet[J].Journal of Northeastern University(Natural Science),2013,34(1):103-106.
[19]傅菊英,姜涛,朱德庆.烧结球团学[M].长沙:中南工业大学,1996:286-302.FU Juying,JIANG Tao,ZHU Deqing.Principle of sintering and pelletizing[M].Changsha:Central South University of Technology Press,1996:286-302.