赤铁精粉配比对烧结矿强度的影响
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摘要
铁精粉具有铁品位高、脉石矿物含量及有害元素少、价格较低等优点,但由于其粒度过细,会对烧结生产产生不良影响,进而导致其使用受到限制。为了明确铁矿烧结过程中赤铁精粉配比对烧结矿强度的影响规律,采用微型烧结法研究了赤铁精粉配比对烧结液相流动性及其固结强度的影响规律,并在此基础上进一步探究了优化石灰石粒度对烧结矿强度的影响规律,最终为高效使用赤铁精粉提供理论基础。研究结果表明,随着赤铁精粉配比的增大,烧结体固结强度呈现先略微降低,而后在配比为15%时大幅下降(相对于配比10%铁精粉来说固结强度降低了16%),这是由于随着赤铁精粉配比的增大,黏附粉的偏析碱度降低,进而使得黏附粉的液相流动性减小,最终导致烧结矿强度降低。然而,减小石灰石粒度,可以有效改善烧结液相流动性,进而提高烧结矿强度。
The concentrate has advantages of high iron grade,less gangue mineral content and less harmful elements and lower price,but it may adversely affect the production of sinter and further restrict its used to its small grain size. In order to clarify the influence of the ratio of hematite concentrate on the formation behavior of the sintered liquid phase in the process of iron ore sintering,the influence of the proportion of the hematite concentrate on the fluidity and the strength of sinter was studied by the micro-sintering method. On the basis of this,the effect of the optimization of the limestone particle size on the strength of sinter was further explored,and finally,it provides a theoretical basis for the efficient use of the hematite concentrate. The results show that with the increase of the proportion of the hematite concentrate,the strength of sinter showed a slight decrease at first and then decreased significantly at a blend ratio of 15%(Which was reduced by 16% relative to a blend ratio of 15% hematite concentrate. It is for that with the ratio of hematite concentrate increasing,the segregation basicity of adhesion decrease,furthermore,the fluidity of the liquid phase decreases,which eventually lead to the decrease of the strength of sinter. However,the fluidity of the liquid phase effectively improved by reducing the limestone particle size,and then the strength of sinter increased.
The concentrate has advantages of high iron grade,less gangue mineral content and less harmful elements and lower price,but it may adversely affect the production of sinter and further restrict its used to its small grain size. In order to clarify the influence of the ratio of hematite concentrate on the formation behavior of the sintered liquid phase in the process of iron ore sintering,the influence of the proportion of the hematite concentrate on the fluidity and the strength of sinter was studied by the micro-sintering method. On the basis of this,the effect of the optimization of the limestone particle size on the strength of sinter was further explored,and finally,it provides a theoretical basis for the efficient use of the hematite concentrate. The results show that with the increase of the proportion of the hematite concentrate,the strength of sinter showed a slight decrease at first and then decreased significantly at a blend ratio of 15%(Which was reduced by 16% relative to a blend ratio of 15% hematite concentrate. It is for that with the ratio of hematite concentrate increasing,the segregation basicity of adhesion decrease,furthermore,the fluidity of the liquid phase decreases,which eventually lead to the decrease of the strength of sinter. However,the fluidity of the liquid phase effectively improved by reducing the limestone particle size,and then the strength of sinter increased.
引文
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[15]阎丽娟,吴胜利,尤艺,等.各种铁矿粉的液相流动性及其互补配矿方法的研究[J].烧结球团,2013,38(6):1.(YAN Lijuan,WU Sheng-li,YOU Yi,et al.Study on liquid phase fluidity of iron ores and its complementary ore proportioning[J].Sintering and Pelletizing,2013,38(6):1.)
[16]刘自民,吴胜利,金俊,等.马钢烧结优化配矿技术的研究[J].烧结球团,2012,37(2):13.(LIU Zi-min,WU Sheng-li,JINJun,et al.Study on optimizing the sintering proportioning in masteel[J].Sintering and Pelletizing,2012,37(2):13.)
[2]沈文俊,李军,冯红云,等.加拿大镜铁精矿烧结试验研究[J].武钢技术,2015,53(2):6.(SHEN Wen-jun,LI Jun,FENGHong-yun,et al.Study on sintering performance of Canada specular concentrates[J].Wuhan Iron and Steel Corporation Technology,2015,53(2):6.)
[3]潘建,师本敬.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.High proportion sintering performance of Canadian iron concentrate[J].Iron and Steel,2014,49(9):21.)
[4]胡洵璞,刘敏媛.高品位巴西铁精矿粉在烧结生产中的应用研究[J].钢铁研究,2010,38(2):17.(HU Xun-pu,LIU Minyuan.Application research on a high grade brazilian concentrates in sintering process[J].Research on Iron and Steel,2010,38(2):17.)
[5]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 Zhengliang,HU Zheng-gang,et al.Research on sintering process of adding Canadian ore fines[J].Research on Iron and Steel,2013,41(6):1.)
[6]唐庆利,张建良,李克江,等.烧结配料优化方法及算法对比分析[J].中国冶金,2017,27(5):13.(TANG Qing-li,ZHANGJian-liang,LI Ke-jiang,et al.Comparative analysis on methods and algorithms for optimization of raw materials blending in sinter process[J].China Metallurgy,2017,27(5):13.)
[7]孟凡俭,孙长余,李廷乐,等.烧结矿中复合铁酸钙形成影响因素[J].钢铁,2018,53(7):16.(MENG Fan-jian,SUN Changyu,LI Ting-le,et al.Formation and influencing factors of silicoferrite of calcium and aluminum in sinte[J].Iron and Steel,2018,53(7):16.)
[8]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(1):22.(ZHOU Yong-ning,ZHANG Yiming,YAN Bao-zhong,et al.Experimental study on sintering properties of high grade specularite[J].Southern Metals,2014(1):22.
[9]贺淑珍,冯焕林,甘晓靳,等.微细精矿比例对烧结的影响及强化技术[J].钢铁研究学报,2016,28(9):10.(HE Shu-zhen,FENG Huan-lin,GAN Xiao-jin,et al.Effect of ultra fine ore on sintering and strengthening measures[J].Journal of Iron and Steel Research,2016,28(9):10.)
[10]贺淑珍.进一步提高细精矿烧结料层厚度的试验[J].中国冶金,2016,26(9):6.(HE Shu-zhen.Experiment on increasing bed height for fine iron ore concentrate sintering[J].China Metallurgy,2016,26(9):6.)
[11]陈子罗,张建良,张亚鹏,等.烧结矿适宜的SiO2质量分数和碱度[J].钢铁,2016,51(12):8.(CHEN Zi-luo,ZHANG Jian-liang,ZHANG Ya-peng,et al.Influence of basicity and w(SiO2)on sinter mineral quality[J].Iron and Steel,2016,51(12):8.)
[12]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.)
[13]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.)
[14]吴胜利,裴元东,陈辉,等.铁矿粉烧结液相流动性评价[J].北京科技大学学报,2008,30(10):1095.(WU Sheng-li,PEIYuan-dong,CHEN Hui,et al.Evaluation on liquid phase fluidity of iron ore in sintering[J].Journal of University of Science and Technology Beijing,2008,30(10):1095.)
[15]阎丽娟,吴胜利,尤艺,等.各种铁矿粉的液相流动性及其互补配矿方法的研究[J].烧结球团,2013,38(6):1.(YAN Lijuan,WU Sheng-li,YOU Yi,et al.Study on liquid phase fluidity of iron ores and its complementary ore proportioning[J].Sintering and Pelletizing,2013,38(6):1.)
[16]刘自民,吴胜利,金俊,等.马钢烧结优化配矿技术的研究[J].烧结球团,2012,37(2):13.(LIU Zi-min,WU Sheng-li,JINJun,et al.Study on optimizing the sintering proportioning in masteel[J].Sintering and Pelletizing,2012,37(2):13.)
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