加拿大铁精粉对烧结体固结强度的影响及其改善方法
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摘要
加拿大铁精粉由于具有铁品位高、脉石及有害元素含量低等优点,其在烧结过程中使用具有有利条件。采用微型烧结法考察了该铁精粉配比对烧结体固结强度的影响及其机理,并研究了4种富矿粉的细粉液相流动性和粗颗粒吸液性。在此基础上,通过固结试验,探究并验证了烧结体固结强度的改善方法。研究结果表明,将该铁精粉配入混匀料中,大幅降低了黏附粉偏析碱度,减弱了液相流动性,因此恶化了烧结体的固结强度。在固定碱度的条件下,高硅铁矿粉有较高的细粉液相流动性,低气孔率铁矿粉有较弱的粗颗粒吸液性。在配加该铁精粉的条件下,选择高液相流动性铁矿粉、弱吸液性铁矿粉、强吸液性铁矿粉粗颗粒分加制粒均能有效改善烧结体的固结强度。
The Canadian iron concentrate has a high ferrous grade and low contents of gangue and harmful elements,which provides a favorable condition for its use during the sintering process.The effect of the iron concentrate on the bonding strength of the sinter body and the influencing mechanism were investigated through the micro-sintering method.The liquid phase fluidity of the fines and the liquid absorbability of the coarse particles were studied on four kinds of iron ore fines.Based on this,the improvement method for the bonding strength of sinter body was explored and verified via bonding tests.The results show that blending the iron concentrate in ore blends decreases the separation basicity of adhering fines and weakens the liquid phase fluidity,hence deteriorating the bonding strength of the sinter body.High-silica iron ore fines have a high liquid phase fluidity of the fines under a fixed basicity,and the low-porosity iron ore fines weaken the liquid absorbability of the coarse particles.Under blending the iron concentrate in ore blends,using the high liquid phase fluidity iron ore fines,weak liquid absorbability iron ore fines,and large-particle divided adding for strong liquid absorbability iron ore fines can effectively improve the bonding strength of the sinter body.
The Canadian iron concentrate has a high ferrous grade and low contents of gangue and harmful elements,which provides a favorable condition for its use during the sintering process.The effect of the iron concentrate on the bonding strength of the sinter body and the influencing mechanism were investigated through the micro-sintering method.The liquid phase fluidity of the fines and the liquid absorbability of the coarse particles were studied on four kinds of iron ore fines.Based on this,the improvement method for the bonding strength of sinter body was explored and verified via bonding tests.The results show that blending the iron concentrate in ore blends decreases the separation basicity of adhering fines and weakens the liquid phase fluidity,hence deteriorating the bonding strength of the sinter body.High-silica iron ore fines have a high liquid phase fluidity of the fines under a fixed basicity,and the low-porosity iron ore fines weaken the liquid absorbability of the coarse particles.Under blending the iron concentrate in ore blends,using the high liquid phase fluidity iron ore fines,weak liquid absorbability iron ore fines,and large-particle divided adding for strong liquid absorbability iron ore fines can effectively improve the bonding strength of the sinter body.
引文
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[19]吴胜利,苏博,齐渊洪,等.铁矿粉液相流动性的主要液相生成特征因素解析[J].北京科技大学学报,2018,40(3):321.(WU Sheng-li,SU Bo,QI Yuan-hong,et al.Major melt formation characteristic factor analysis of iron ore liquid phase fluidity during the sintering process[J].Journal of University of Science and Technology Beijing,2018,40(3):321.)
[20]吴胜利,苏博,宋天凯,等.铁矿粉烧结优化配矿技术的研究进展[C]//第十届中国钢铁年会暨第六届宝钢学术年会论文集.上海:中国金属学会和宝钢集团有限公司,2015:1.(WU Sheng-li,SU Bo,SONG Tian-kai,et al.Research progress of optimization technology of ore-blending for sintering[C]//Proceedings of 10th China Iron and Steel Annual Meeting and6th Baosteel Academic Annual Meeting.Shanghai:The Chinese Society for Metals and Baosteel Group Coporation,2015:1.)
[21] PENG J,ZHANG L,LIU L X,et al.Relationship between liquid fluidity of iron ore and generated liquid content during sintering[J].Metallurgical and Materials Transactions B,2017,48(2):538.
[2] WU S L,QUE Z G,ZHAI X B,et al.Effect of characteristics of fine iron ores on the granulation behavior of concentrate in sintering granulation process[J].Metallurgical Research and Technology,2018,115(2):202.
[3]李智慧,刘艳琴,李杰,等.唐钢司家营精矿粉制粒性能试验研究[J].河北理工大学学报:自然科学版,2009,31(3):16.(LI Zhi-hui,LIU Yan-qin,LI Jie,et al.Research on manufacturing granule trial of Sijiaying fine iron ore in Tangshan Steel Co[J].Journal of Hebei Polytechnic University:Natural Science,2009,31(3):16.)
[4] ZHU D Q,GUO Z Q,PAN J,et al.A study of pre-briquetting granulation sintering of the mixtures with high ratio of Brazilian specularite concentrate[J].Ironmaking and Steelmaking,2016,43(10):721.
[5]宋鹤锴,吴胜利,阙志刚,等.赤铁精粉配比对烧结矿强度的影响[J].钢铁,2019,54(1):8.(SONG He-kai,WU Shengli,QUE Zhi-gang,et al.Effect of ratio of hematite concentrate on strength of sinter[J].Iron and Steel,2019,54(1):8.)
[6] PAN J,SHI B J,ZHU D Q,et al.Improving sintering performance of specularite concentrates by pre-briquetting process[J].ISIJ International,2016,56(5):777.
[7] Pan J,Zhu D Q,Hamilton P,et al.Improving granulating and sintering performance by pretreating specularite concentrates through mechanical activation[J].ISIJ International,2013,53(12):2013.
[8]朱德庆,王志远,潘建,等.润磨强化镜铁精粉烧结特性的研究[J].钢铁,2007,42(1):12.(ZHU De-qing,WANG Zhiyuan,PAN Jian,et al.Improvement of sintering behaviors of Brazilian specularite concentrate by damp milling[J].Iron and Steel,2007,42(1):12.)
[9]周永宁,张义明,闫宝忠,等.高品位镜铁矿烧结性能试验研究[J].南方金属,2014(196):22.(ZHOU Yong-ning,ZHANG Yi-ming,YAN Bao-zhong,et al.Experimental study on sintering properties of high grade specularite[J].Southern Metals,2014(196):22.)
[10]安钢,赵志星,徐萌,等.加拿大低Al2O3矿粉实验研究[J].钢铁,2008,43(9):8.(AN Gang,ZHAO Zhi-xing,XU Meng,et al.Experimental study on sintering performance of Canadian low Al2O3iron ore[J].Iron and Steel,2008,43(9):8.)
[11]肖志新,薛正良,胡正刚,等.配用加拿大矿粉的烧结试验研究[J].钢铁研究,2013,41(6):1.(XIAO Zhi-xin,XUE Zheng-liang,HU Zheng-gang,et al.Research on sintering process of adding Canadian ore fines[J].Research on Iron and Steel,2013,41(6):1.)
[12]王素平,毕学工,李军.加拿大精矿烧结性能试验研究[J].钢铁研究,2008,36(6):1.(WANG Su-ping,BI Xue-gong,LI Jun.Study on sintering properties of Canadian iron concentrates[J].Research on Iron and Steel,2008,36(6):1.)
[13]潘建,师本敬,朱德庆,等.加拿大某精矿高配比烧结特性[J].钢铁,2014,49(9):21.(PAN Jian,SHI Ben-jing,ZHU Deqing,et al.High proportion sintering performance of Canadian iron concentrate[J].Iron and Steel,2014,49(9):21.)
[14] WU S L,ZHANG G L.Liquid absorbability of iron ores and large limonite particle divided adding technology in the sintering process[J].Steel Research International,2015,86(9):1014.
[15] WU S L,SU B,QI Y H,et al.Melt absorbability of iron ore nuclei and its influence on suitable liquid content of sintered body[J].Metallurgical and Materials Transactions B,2017,48B(10):2469.
[16] GAN M,FAN X H,JI Z Y,et al.Optimising method for improving granulation effectiveness of iron ore sintering mixture[J].Ironmaking and Steelmaking,2015,42(5):351.
[17]吴胜利,刘宇,杜建新,等.铁矿石的烧结基础特性之新概念[J].北京科技大学学报,2002,24(3):254.(WU Sheng-li,LIU Yu,DU Jian-xin,et al.New concept of iron ores sintering basic characteristics[J].Journal of University of Science and Technology Beijing,2002,24(3):254.)
[18]吴胜利,杜建新,马洪斌,等.铁矿粉烧结液相流动特性[J].北京科技大学学报,2005,27(3):291.(WU Sheng-li,DU Jianxin,MA Hong-bin,et al.Fluidity of liquid phase in iron ores during sintering[J].Journal of University of Science and Technology Beijing,2005,27(3):291.)
[19]吴胜利,苏博,齐渊洪,等.铁矿粉液相流动性的主要液相生成特征因素解析[J].北京科技大学学报,2018,40(3):321.(WU Sheng-li,SU Bo,QI Yuan-hong,et al.Major melt formation characteristic factor analysis of iron ore liquid phase fluidity during the sintering process[J].Journal of University of Science and Technology Beijing,2018,40(3):321.)
[20]吴胜利,苏博,宋天凯,等.铁矿粉烧结优化配矿技术的研究进展[C]//第十届中国钢铁年会暨第六届宝钢学术年会论文集.上海:中国金属学会和宝钢集团有限公司,2015:1.(WU Sheng-li,SU Bo,SONG Tian-kai,et al.Research progress of optimization technology of ore-blending for sintering[C]//Proceedings of 10th China Iron and Steel Annual Meeting and6th Baosteel Academic Annual Meeting.Shanghai:The Chinese Society for Metals and Baosteel Group Coporation,2015:1.)
[21] PENG J,ZHANG L,LIU L X,et al.Relationship between liquid fluidity of iron ore and generated liquid content during sintering[J].Metallurgical and Materials Transactions B,2017,48(2):538.