微观性能对烧结矿低温还原粉化的影响
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摘要
为了研究在使用两种化学成分基本相同的烧结矿时,高炉上部压差和炉况差异较大的问题,对两种烧结矿分别喷洒氯化钙溶液后,进行了低温还原粉化检测。发现氯化钙溶液对A烧结矿无影响,但可显著降低B烧结矿的低温还原粉化指数。进而,采用真密度测定仪、光学显微镜及图像分析、纳米力学测试系统,测量了两种烧结矿微观结构的差异。A烧结矿孔隙率高、晶粒细小、物相硬度低,强度差。喷洒氯化钙后,还原初期部分界面被隔绝,后期闭孔打开后,因总孔隙率高,反应界面大,且结构强度低,难以抵抗还原应力,低温还原粉化指标未得到改善。B烧结矿喷洒氯化钙后,隔绝部分气固反应界面,因孔隙率低、晶粒粗大、反应界面小,物相硬度高,矿物结构强度高,能很好地抵抗还原应力,喷洒不同量氯化钙溶液能降低低温还原粉化率10.00%~27.25%。结果表明,微观结构和性能是影响烧结矿低温还原粉化的重要因素,有助于加深对烧结矿还原粉化行为的认识。
In order to study the pressure difference and stability of BF are quite different when using two kinds of sinter with the same chemical composition,. After the two kinds of sinter were sprayed with calcium chloride solution,RDI were carried out. It is found that calcium chloride solution has no effect on A sinter,but it can significantly reduce the RDI of B sinter. Further,the difference of microstructure of two sinter was measured by real density detector,optical microscope,image analysis and nanomechanical test system. Sinter A has high porosity,fine grain,low phase hardness and poor strength. After calcium chloride was sprayed,some interfaces were isolated at the initial stage of reduction process. With the reaction interface expanding rapidly,the low structure strength of the sinter is difficult to resist the reducing stress. Thus,the RDI was not improved. After the sinter B was sprayed by calcium chloride solution,a protective film can be formed to isolate the gas solid reaction. Because sinter B has low porosity,coarse grain,small reaction interface,high phase hardness and high strength,it can well resist the reducing stress. Spraying different amounts of CaCl_2 solution can reduce the RDI by 10.00%-27.25%. The results show that microstructure is one of the important factors for the difference of RDI.
In order to study the pressure difference and stability of BF are quite different when using two kinds of sinter with the same chemical composition,. After the two kinds of sinter were sprayed with calcium chloride solution,RDI were carried out. It is found that calcium chloride solution has no effect on A sinter,but it can significantly reduce the RDI of B sinter. Further,the difference of microstructure of two sinter was measured by real density detector,optical microscope,image analysis and nanomechanical test system. Sinter A has high porosity,fine grain,low phase hardness and poor strength. After calcium chloride was sprayed,some interfaces were isolated at the initial stage of reduction process. With the reaction interface expanding rapidly,the low structure strength of the sinter is difficult to resist the reducing stress. Thus,the RDI was not improved. After the sinter B was sprayed by calcium chloride solution,a protective film can be formed to isolate the gas solid reaction. Because sinter B has low porosity,coarse grain,small reaction interface,high phase hardness and high strength,it can well resist the reducing stress. Spraying different amounts of CaCl_2 solution can reduce the RDI by 10.00%-27.25%. The results show that microstructure is one of the important factors for the difference of RDI.
引文
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[15]朱德庆,薛钰霄,潘建,等.铁矿粉高温反应性能综合指数评价烧结性能[J].钢铁,2017,52(8):19.(ZHU De-qing,XUE Yu-xiao,PAN Jian,et al.Evaluation of sintering behaviors with comprehensive index of high temperature reaction properties of iron ore fines[J].Iron and Steel,2017,52(8):19.)
[16]王耀祖,张建良,刘征建,等.w(Ti O2)对烧结矿矿相结构及软熔滴落性能的影响[J].钢铁,2017,52(10):20.(WANG Yao-zu,ZHANG Jian-liang,LIU Zheng-jian,et al.Effects of w(Ti O2)on mineral structure and softening-melting property of sinter[J].Iron and Steel,2017,52(10):20.)
[17]Fujii K,Hazama K,Hoshikuma Y,et al.Reduction of Fe O contents in sinter under high bed operation[C]//55thIronmaking Conference.Pittsburgh:Iron and Steel Society,1996:383.
[18]李朋林,蒋文笛.烧结矿Fe O量控制技术[J].武钢技术,1993(7):39.(LI Peng-lin,JIANG Wen-di.Fe O control technology of sinter[J].Wisco Technology,1993(7):39.)
[2]蒋大军,何木光,甘勤,等.高碱度条件下Fe O对烧结矿性能的影响[J].中国冶金,2008,18(11):14.(JIANG Da-jun,HE Mu-guang,GAN Qin,et al.Experiment on influence of Fe O on sinter property under high basicity condition[J].China Metallurgy,2008,18(11):14.)
[3]陈道栋,洪灶熬.碱度对烧结矿冶金性能的影响[J].烧结球团,1984,9(5):28.(CHEN Dao-dong,HONG Zao-ao.Influence of basicity on the metallurgical properties of sinter[J].Sintering and Pelletizing,1984,9(5):28.)
[4]韩秀丽,吕水,杨光.不同碱度司家营烧结矿矿相结构特征及其对冶金性能的影响[J].河北理工大学学报:自然科学版,2011,33(1):22.(HAN Xiu-li,LüShui,YANG Guang.Mineral phase structure and its influence on metallurgical properties with different basicity in Sijiaying sinter[J].Journal of Hebei Polytechnic University:Natural Science,2011,33(1):22.)
[5]许满兴.烧结矿冶金性能对其质量和高炉主要操作指标的影响[J].烧结球团,2014,39(3):1.(XU Man-xing.Influences of metallurgical properties of sinter on its quality and major operation indexes of blast furnace[J].Sintering and Pelletizing.2014,39(3):1.)
[6]WU Sheng-li,LIU Xiao-qin,ZHOU Qi,et al.Low temperature reduction degradation characteristics of sinter,pellet and lump ore[J].Journal of Iron and Steel Research,International,2011,18(8):20.
[7]LI Jian,ZHU Jin-ming,XIONG Lin,et al.Reduction behaviors of iron ore lump and pellets with H2-CO gas[J].Baosteel Technical Research,2012,6(2):13.
[8]沈红标.喷洒Ca Cl2溶液抑制烧结矿RDI的时效性研究[J].炼铁,2005,24(s1):111.(SHEN Hong-biao.Investigation on the effective period of depressing the sinter's RDI by spraying Ca Cl2liquor[J].Ironmaking,2005,24(s1):111.)
[9]贺淑珍,高玲玲.降低烧结矿低温还原粉化率的试验研究[J],钢铁研究,2007,35(5):1.(HE Shu-zhen,GAO Ling-ling.Study on lowering reduction degradation index(RDI)of sinter[J].Research on Iron and Steel,2007,35(5):1.)
[10]谢国海,张兴华,尹怡,等.喷洒Ca Cl2溶液控制烧结矿低温还原粉化的试验研究[J].炼铁,1998,17(增刊):68.(XIE Guohai,ZHANG Xing-hua,YIN Yi,et al.Experimental study on low temperature reduction and reduction of sinter by spraying Ca Cl2solution[J].Ironmaking,1998,17(s1):68.)
[11]安钢,裴元东,程峥明,等.首钢京唐烧结矿低温还原粉化性能影响因素分析及氯化钙喷洒研究[J].烧结球团,2015,40(5):19.(AN Gang,PEI Yuan-dong,CHENG Zheng-ming,et al.Analysis of influencing factors for low temperature reduction disintegration index of sinter and study on spraying of calcium chloride in Shougang Jingtang[J].Sintering and Pelletizing,2015,40(5):19.)
[12]李咸伟.氯化物对烧结矿RDI影响的试验研究[J].宝钢技术,1998(1):19.(LI Xian-wei.Experimental research of the effect of chloridate on RDI of sinter[J].Baosteel Technology,1998(1):19.)
[13]杨华明,邱冠周,唐爱东.Ca Cl2对烧结矿RDI的影响[J].中南工业大学学报,1998,29(3):229.(YANG Hua-ming,QIU Guan-zhou,TANG Ai-dong.Effect of Ca Cl2on sinter RDI[J].Journal of Central South University Technology,1998,29(3):229.)
[14]梁南山.氯化钙对烧结矿低温还原粉化的微观影响研究[J].金属材料与冶金工程,2016,44(1):42.(LIANG Nan-shan.Research on effect of Ca Cl2to RDI of sinter[J].Metal Materials and Metallurgy Engineering,2016,44(1):42.)
[15]朱德庆,薛钰霄,潘建,等.铁矿粉高温反应性能综合指数评价烧结性能[J].钢铁,2017,52(8):19.(ZHU De-qing,XUE Yu-xiao,PAN Jian,et al.Evaluation of sintering behaviors with comprehensive index of high temperature reaction properties of iron ore fines[J].Iron and Steel,2017,52(8):19.)
[16]王耀祖,张建良,刘征建,等.w(Ti O2)对烧结矿矿相结构及软熔滴落性能的影响[J].钢铁,2017,52(10):20.(WANG Yao-zu,ZHANG Jian-liang,LIU Zheng-jian,et al.Effects of w(Ti O2)on mineral structure and softening-melting property of sinter[J].Iron and Steel,2017,52(10):20.)
[17]Fujii K,Hazama K,Hoshikuma Y,et al.Reduction of Fe O contents in sinter under high bed operation[C]//55thIronmaking Conference.Pittsburgh:Iron and Steel Society,1996:383.
[18]李朋林,蒋文笛.烧结矿Fe O量控制技术[J].武钢技术,1993(7):39.(LI Peng-lin,JIANG Wen-di.Fe O control technology of sinter[J].Wisco Technology,1993(7):39.)