MgO对赤铁矿压团还原膨胀性能的影响
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摘要
为探究MgO对球团还原膨胀性能的影响机理,分阶段还原了添加不同MgO纯试剂的赤铁矿压团(Fe_2O_3→Fe_3O_4、Fe_3O_4→FeO和FeO→Fe三个阶段),同时利用扫描电镜对还原产物进行表征。结果表明,当压团添加MgO含量分别为0%、2%和4%时,在还原第一阶段压团还原膨胀率分别为11.06%、5.63%、3.85%,随着MgO含量的增加压团还原膨胀率逐渐降低。还原第二阶段加入MgO的压团还原膨胀率依然随MgO含量的增加而降低。在还原第三阶段,MgO的添加抑制了铁晶须的生长,添加MgO含量分别为0%、2%和4%时,压团还原膨胀率分别为28.33%、15.21%和10.91%。
In order to explore influence mechanism of MgO on reduction expansion properties of pellets,step-by-step reduction of hematite briquetting with addition of different amounts of MgO pure reagents(i.e.,Fe_2O_3→Fe_3O_4,Fe_3O_4→FeO and FeO→Fe)was conducted.Reduction products were characterized by SEM.The results show that when MgO addition is 0%,2% and 4% respectively,reduction expansion rate of briquettes in the first stage of reduction is 11.06%,5.63% and 3.85%,respectively.Expansion rate gradually drops with increasing addition of MgO.At the second reduction stage,expansion rate still gradually drops with increase of addition of MgO.In the third stage of reduction,growth of iron whiskers is restrained by addition of MgO,and expansion rate is 28.33%,15.21% and 10.91%when MgO addition is 0%,2% and 4% respectively.
In order to explore influence mechanism of MgO on reduction expansion properties of pellets,step-by-step reduction of hematite briquetting with addition of different amounts of MgO pure reagents(i.e.,Fe_2O_3→Fe_3O_4,Fe_3O_4→FeO and FeO→Fe)was conducted.Reduction products were characterized by SEM.The results show that when MgO addition is 0%,2% and 4% respectively,reduction expansion rate of briquettes in the first stage of reduction is 11.06%,5.63% and 3.85%,respectively.Expansion rate gradually drops with increasing addition of MgO.At the second reduction stage,expansion rate still gradually drops with increase of addition of MgO.In the third stage of reduction,growth of iron whiskers is restrained by addition of MgO,and expansion rate is 28.33%,15.21% and 10.91%when MgO addition is 0%,2% and 4% respectively.
引文
[1]王海风,裴元东,张春霞,等.中国钢铁工业烧结/球团工序绿色发展工程科技战略及对策[J].钢铁,2016,51(1):1-7.
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[0]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,2013,34(1):103-106.
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[12]范晓慧,甘敏,陈许玲,等.低碱度镁质氧化球团的试验研究[J].钢铁,2009,44(3):6-10.
[13]NOGUEIRA P F,FRUEHAN R J.Blast furnace burden softening and melting phenomena:PartⅡ.Evolution of the structure of the pellets[J].Metallurgical and Materials Transactions B,2005,36(5):583-590.
[14]NOGUEIRA P F,FRUEHAN R J.Blast furnace burden softening and melting phenomena:PartⅢ.Melt onset and initial microstructure transformation in pellets[J].Metallurgical and Materials Transactions B,2006,37(4):551-558.
[15]任立军.首钢京唐提高高炉炉况稳定性的实践[N].世界金属导报,2013-08-06(B02).
[16]ILJANA M,MATTILA O,ALATARVAS T,et al.Effect of circulating elements on the dynamic reduction expansion behavior of olivine and acid iron ore pellets under simulated blast furnace shaft conditions[J].ISIJInternational,2013,53(3):419-426.
[17]姜涛,何国强,李光辉,等.脉石成分对铁矿石球团还原膨胀性能的影响[J].钢铁,2007,42(5):8-11.
[18]FAN X H,GAN M,JIANG T,et al.Influence of flux additives on iron ore oxide pellets[J].Journal of Central South University,2010,17(4):732-737.
[19]LI G H,TANG Z K,ZHANG Y B,et al.Reduction expansion behavior of hematite/magnetite agglomerates with addition of MgO and CaO[J].Ironmaking&Steelmaking,2010,37(6):393-397.
[20]朱建国,孙晨晨,罗果萍,等.MgO对赤铁矿焙烧压团组成结构与强度的影响[J].有色金属(冶炼部分),2018(10):5-9.
[2]DWARAPUDI S,SEKHAR C,PAUL I,et al.Effect of fluxing agents on reduction degradation behavior of hematite pellets[J].Ironmaking&Steelmaking,2016,43(3):180-191.
[3]ONODA M,TSUCHIYA O,SUGIYAMA T.Quality improvements of lime-fluxed pellets[C]//Proc of ISS-AIME 40th Ironmaking Conference.Toronto,1981:286-287.
[4]SEMBERG P,RUTQVIST A,ANDERSSON C,et al.Interaction between iron oxides and olivine in magnetite based pellets during reduction at temperatures below1 000℃[J].ISIJ International,2013,53(3):391-398.
[5]PAL J,ARUNKUMAR C,RAJSHEKHAR Y.Development on iron ore pelletization using calcined lime and MgOcombined flux replacing limestone and bentonite[J].ISIJInternational,2014,54(10):2169-2178.
[6]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.
[7]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.
[8]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.
[0]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,2013,34(1):103-106.
[10]小野田守.MgO对球团高温特性的影响及其在高炉内的行为[J].烧结球团,1983(5):93-102.
[11]SRINIVAS D,TAMAL K G,AMITABH S,et al.Effect of pyroxenite flux on the quality and microstructure of hematite pellets[J].International Journal of Mineral Processing,2010:45-53.
[12]范晓慧,甘敏,陈许玲,等.低碱度镁质氧化球团的试验研究[J].钢铁,2009,44(3):6-10.
[13]NOGUEIRA P F,FRUEHAN R J.Blast furnace burden softening and melting phenomena:PartⅡ.Evolution of the structure of the pellets[J].Metallurgical and Materials Transactions B,2005,36(5):583-590.
[14]NOGUEIRA P F,FRUEHAN R J.Blast furnace burden softening and melting phenomena:PartⅢ.Melt onset and initial microstructure transformation in pellets[J].Metallurgical and Materials Transactions B,2006,37(4):551-558.
[15]任立军.首钢京唐提高高炉炉况稳定性的实践[N].世界金属导报,2013-08-06(B02).
[16]ILJANA M,MATTILA O,ALATARVAS T,et al.Effect of circulating elements on the dynamic reduction expansion behavior of olivine and acid iron ore pellets under simulated blast furnace shaft conditions[J].ISIJInternational,2013,53(3):419-426.
[17]姜涛,何国强,李光辉,等.脉石成分对铁矿石球团还原膨胀性能的影响[J].钢铁,2007,42(5):8-11.
[18]FAN X H,GAN M,JIANG T,et al.Influence of flux additives on iron ore oxide pellets[J].Journal of Central South University,2010,17(4):732-737.
[19]LI G H,TANG Z K,ZHANG Y B,et al.Reduction expansion behavior of hematite/magnetite agglomerates with addition of MgO and CaO[J].Ironmaking&Steelmaking,2010,37(6):393-397.
[20]朱建国,孙晨晨,罗果萍,等.MgO对赤铁矿焙烧压团组成结构与强度的影响[J].有色金属(冶炼部分),2018(10):5-9.
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