矿粉粒度及反应温度对高磷鲕状赤铁矿制备碳化铁的影响
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摘要
为探索利用高磷鲕状赤铁矿作为炼钢原料的新途径,在CH4-H2气氛下对高磷鲕状赤铁矿制备碳化铁进行了实验研究,探讨了矿粉粒度对还原和碳化的影响。采用热重法、SEM-EDS和XRD分别对实验中试样还原失重过程、高磷鲕状赤铁矿矿相和碳化产物进行了分析。实验得到120~160目粒度矿粉的反应活化能最低,还原反应活化能为44.95kJ/mol,碳化阶段表观活化能为9.71kJ/mol。从反应速率的角度,利用高磷鲕状赤铁矿制备碳化铁的最佳温度为1 023K,矿粉的最佳粒度为120~160目,总体来讲,温度比矿粉粒度对高磷鲕状赤铁矿制备碳化铁反应速率的影响大。
In order to use high phosphorus oolitic hematite as a new raw material for steelmaking,the particle size of high phosphorus oolitic hematite and reaction temperature on the preparation of iron carbide are studied in H2-CH4 atmosphere.The weight loss of sample in reduction process,phase composition of high phosphorus oolitic hematite and carburization products are investigated by means of thermogravimetric method,SEM-EDS and XRD.The SEM-EDS and XRD analysis show that the main compositions of high phosphorus oolitic iron ore are hematite and quartz,and the main microstructure is oolitic clusters with the zonal distribution of hematite and apatite.According to the experiment results,the reaction activation energy of high phosphorus oolitic hematite with size in the range of 120~160 mesh is the lowest.Inreduction step,the reaction activation energy is 44.95kJ/mol,and the apparent reaction activation energy is 9.71kJ/mol in carburization step.From the perspective of reaction rate,the optimum temperature for preparing iron carbide from high phosphorus oolitic hematite is 1 023 Kand the optimum particle size is120~160mesh.Generally,compared with iron ore particle size,temperature has much more influence on the iron carbide formation from high phosphorus oolitic hematite.
In order to use high phosphorus oolitic hematite as a new raw material for steelmaking,the particle size of high phosphorus oolitic hematite and reaction temperature on the preparation of iron carbide are studied in H2-CH4 atmosphere.The weight loss of sample in reduction process,phase composition of high phosphorus oolitic hematite and carburization products are investigated by means of thermogravimetric method,SEM-EDS and XRD.The SEM-EDS and XRD analysis show that the main compositions of high phosphorus oolitic iron ore are hematite and quartz,and the main microstructure is oolitic clusters with the zonal distribution of hematite and apatite.According to the experiment results,the reaction activation energy of high phosphorus oolitic hematite with size in the range of 120~160 mesh is the lowest.Inreduction step,the reaction activation energy is 44.95kJ/mol,and the apparent reaction activation energy is 9.71kJ/mol in carburization step.From the perspective of reaction rate,the optimum temperature for preparing iron carbide from high phosphorus oolitic hematite is 1 023 Kand the optimum particle size is120~160mesh.Generally,compared with iron ore particle size,temperature has much more influence on the iron carbide formation from high phosphorus oolitic hematite.
引文
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[2]陈禄玫,任南琪,熊大和.海钢尾矿强磁-离心分离再选试验[J].金属矿山,2006(10):75.CHEN Lumei,REN Nanqi,XIONG Dahe.Test research on reconcentration of hainan steels tailings by high intensity magnetic separation-centrifugal separator[J].Metal Mine,2006(10):75.(in Chinese)
[3]郝先耀,戴惠新,赵志强.高磷铁矿石降磷的现状与存在[J].金属矿山,2007(1):7.HAO Xianyao,DAI Huixin,ZHAO Zhiqiang.State Quo of phosphorous reduction of high phosphorus iron ore and discussion on its problems[J].Metal Mine,2007(1):7.(in Chinese)
[4]卢尚文,张邦家,熊道仁,等.宁乡式胶磷铁矿用解胶浸矿法降磷的研究[J].金属矿山,1994(8):30.LU Shangwen,ZHANG Bangjia,XIONG Daoren,et al.Investigation on the dephosphorization of lingxiang type colloidal phosphorous iron ore by decolloidization leaching[J].Metal Mine,1994(8):30.(in Chinese)
[5]Obot C N A W.Phosphorus Removal Capability of Aspergillus Terreus and Bacillus Subtilis from Nigeria’s Agbaja Iron Ore[J].Journal of Minerals&Materials Characterization&Engineering,2010,9(12):1131-1138.
[6]Obot O W,Anyakwo C N.Comparative Phosphorus Removal Capabilities of Eurotium Herbarorium and Clostridium Species on Nigeria’S Agbaja Iron Ore[J].Journal of Minerals&Materials Characterization&Engineering,2012,11(8):848-852.
[7]Bahgat M.Technology of Iron Carbide Synthesis[J].Journal of materials science and technology,2006,22(3):423-432.
[8]中川大,村山武昭,小野陽一.CH4-H2混合ガスによるアイアンカーバイドの製造[J].鉄と鋼,1996,82(4):261-265.Hiroshi N,Takeaki M,Yoichi O.Production of Iron Carbide in CH4-H2Mixtures[J].The Iron and Steel Institute of Japan,1996,82(4):261-265.
[9]Zhang J Q,O Ostrovsk.Cementite formation in CH4-H2-Ar gas mixture and cementite stability[J].ISIJ International,2001,41(4):333.
[10]Li G Q,Ma J H,Ni H W,et al.Influences of oxide additions on formation reaction of iron carbide at 1 023k[J].ISIJ International,2006,46(7):981-986.
[11]何强,李光强,吴仕慈,等.V2O3、Al2O3添加剂对碳化铁生成的影响[J].钢铁钒钛,2008,29(2):28.HE Qiang,LI Guangqiang,WU Shici,et al.Effect of V2O3 and Al2O3 addition on iron carbide formation[J].Iron Steel Vandium Titanium,2008,29(2):28.(in Chinese)
[12]Li G Q,Wang H H,Yang J,et al.Preparation of iron carbide from high phosphorus oolitic hematite[C]//Chemical,Material and Metallurgical EngineeringⅢ.Zhuhai,December 10-11,2013.
[13]何强,李光强,马江华,等.添加V2O5催化剂制备碳化铁的动力学[J].过程工程学报,2008,8(增1):194.HE Qiang,LI Guangqiang,MA Jianghua,et al.Study on reaction kinetics of promoting iron carbide formation by V2O5additive[J].The Chinese Journal of Process Engineering,2008,8(suppl):194.(in Chinese)
[14]薛正良,赵栋楠,杨叠,等.高碱度内配煤团块自还原过程中脱硫和脱磷[J].北京科技大学学报,2010,32(12):1532-1536.XUE Zhengliang,ZHAO Dongnan,YANG Die,et al.Desulfurization and dephosphorization during self-reduction of highbasicity coal-bearing iron oxide briquettes[J].Journal of University of Science and Technology Beijing,2010,32(12):1532-1536.(in Chinese)
[15]赵志龙,唐惠庆,郭占成,等.高磷铁矿气基还原冶炼低磷铁[J].北京科技大学学报,2009,31(8):964-969.ZHAO Zhilong,TANG Huiqing,GUO Zhancheng,et al.Dephosphorization of high-level phosphorus iron ore by gas-based reduction and melt separation[J].Journal of University of Science and Technology Beijing,2009,31(8):964-969.(in Chinese)
[16]华一新.冶金过程动力学导论[M].北京:冶金工业出版社,2004.HUA Yixin.An introduction to kinetics of metallurgical processes[M].Beijing:Metallurgical Industry Press,2004.(in Chinese)
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