碱度对细粒级铁矿粉球团性能的影响
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摘要
为了研究配加石灰石粉,球团矿碱度提高后其性能的变化,以细粒级铁矿粉为铁料开展了试验。结果表明,二元碱度(w(CaO)/w(SiO_2))由基准期的0.2提高到0.4、0.6、0.8、1.0、1.2、1.4后,生球性能没有发生明显的变化,其适宜的预热温度保持不变,而其焙烧温度可降低20℃。随着碱度的提高,其焙烧球抗压强度呈升高趋势,当球团矿碱度为1.2时,达到最大值。冶金性能试验结果表明,随着碱度的提高,球团矿的还原度呈升高趋势,当碱度达到0.8时,还原膨胀率达到最大值。
The experiments were carried out to determine the effect of basicity on properties of pellets by adding limestone powder and adjusting basicity from 0.2 to 1.4. The results indicate that there is no remarkable effect on properties of green pellets with the increase of basicity. It is also found that roasting temperature will decrease by 20 ℃. However, compressive strength of roasted pellets increases with the increase of pellets basicity and reaches a maximum value with basicity being 1.2. The results on metallurgical properties testing indicate that reduction index increases with the increase of pellets basicity, but reduction swelling index reaches a maximum value with basicity being 0.8.
The experiments were carried out to determine the effect of basicity on properties of pellets by adding limestone powder and adjusting basicity from 0.2 to 1.4. The results indicate that there is no remarkable effect on properties of green pellets with the increase of basicity. It is also found that roasting temperature will decrease by 20 ℃. However, compressive strength of roasted pellets increases with the increase of pellets basicity and reaches a maximum value with basicity being 1.2. The results on metallurgical properties testing indicate that reduction index increases with the increase of pellets basicity, but reduction swelling index reaches a maximum value with basicity being 0.8.
引文
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[7] 范晓慧,甘敏,陈许铃,等.低碱度镁质氧化球团的试验研究[J].钢铁,2009,44(3):6.(Fan X H,Gan M,Chen X L,et al.Experiments of low-basicity magnesia oxidized pellets[J].Iron and Steel,2009,44(3):6.)
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[13] 青格勒,吴铿,刘洪松,等.焙烧温度对低硅含镁球团矿还原膨胀率的影响及机理[J].中国有色金属学报,2015,25(10):2905.(Qing G L,Wu K,Liu H S,et al.Effect and mechanism of calcination temperature on reduction swelling rate of low silica magnesium pellets[J].The Chinese Journal of Nonferrous Metals,2015,25(10):2905.)
[14] 尚策,周明顺,翟立委,等.双层复合熔剂性球团的开发研究[J].材料与冶金学报,2010,9(2):79.(Shang C,Zhou M S,Zhai L W,et al.Development of complex fluxed pellets with double layer structure[J].Journal of Materials and Metallurgy,2010,9(2):79.)
[15] 张金良.熔剂性赤铁矿球团焙烧特性及高炉还原行为研究[D]//长沙:中南大学,2012.(Zhang J L.Roasting Characteristics and Reduction Behaviors of Fluxed Brazilian Hematite Oxidized Pellets[D]//Changsha:Central South University,2012.)
[16] 李国玮,王学蜂.首钢熔剂性球团矿的试验研究[J].首钢科技,2002(3):17.(Li G W,Wang X F.Study on pellets with fluxes agent at ShouGang [J].Technology of Shougang,2002(3):17.)
[17] 张永明.含MgO熔剂性球阿矿特点及生产实践[J].烧结球团,1998,23(2):1.(ZhangY M.Characteristic and production practice of fluxed pellets contents MgO[J].Sintering and Industry Palletizing,1998,23(2):1.)
[18] 傅菊英,朱德庆.铁矿氧化球团基本原理、工艺及设备[M].长沙:中南大学出版社,2005.(Fu J Y,Zhu D Q.Process and Equipment of Iron Ore Pellets Production [M].Changsha:Central South University Press,2005.)
[19] 姜涛.烧结球团生产技术手册[M].北京:冶金工业出版社,2014.(Jiang T.Production and Technology Manual of Sinter and Pellets [M].Beijing:Metallurgical Industry Press,2014.)
[20] 黄柱成.铁矿造块研究方法[M].长沙:中南大学出版社,2015.(Huang Z C.Research Methodology on Agglomeration of Iron Ores[M].Changsha:Central South University Industry Press,2015.)
[2] 朱德庆,黄伟群,杨聪聪,等.铁矿球团技术进展[J].烧结球团,2017,42(3):42.(Zhu D Q,Huang W Q,Yang C C,et al.Technical progress in iron ore pelletization[J].Sintering and Pelletizing,2017,42(3):42.)
[3] Srinivas D,Tamal K G,Amitabh S.Effect of pellet basicity and MgO content on the quality and microstructure of hematite pellets[J].Intemational Journal of Mineral Processing,2011,99(4):43.
[4] Sugiyama T,Shirouchi S,Tsuchi O,et al.High temperature reduction and softening properties of pellets with magnesite[J].ISIJ International,1982,23:53.
[5] Srinivas D,Tamal K G,Amitabh S.Effect of pyroxenite flux on the quality and microstructure of hematite pellets[J].International Journal of Mineral Processing,2010,96:45.
[6] 何国强.难处理赤铁精矿制备氧化球团的基础及技术研究[D]//长沙:中南大学,2011.(He G Q.Fundamental and Technological Investigation on Production of Oxide Pellets from Refractory Hematite Concentrate[D]//Changsha:Central South University,2011.)
[7] 范晓慧,甘敏,陈许铃,等.低碱度镁质氧化球团的试验研究[J].钢铁,2009,44(3):6.(Fan X H,Gan M,Chen X L,et al.Experiments of low-basicity magnesia oxidized pellets[J].Iron and Steel,2009,44(3):6.)
[8] 范建军,杨礼元,蔡湄夏.润磨预处理对改善MgO球团矿预热焙烧性能的影响[J].钢铁,2012,47(11):21.(Fan J J,Yang L Y,Cai M X,et al.Effect of damp milling on improvement of preheating and roasting properties for magnesia pellets[J].Iron and Steel,2012,47(11):21.)
[9] 于淑娟,于素荣,黄永君,等.改善鞍钢球团矿冶金性能的研究[J].烧结球团,2007,32(3):13.(Yu S J,Yu S R,Huang Y J,et al.Study on improving metallurgical properties of acid pellets in ANSTEEL Co.,Ltd[J].Sintering and Pelletizing,2007,32(3):13.)
[10] 徐晨光,龙跃,田铁磊.高镁碱性球团矿冶金性能试验研究[J].烧结球团,2016,41(1):36.(Xu C G,Long Y,Tian T L,et al.Experimental study on metallurgical properties of high magnesia alkaline pellets[J].Sintering and Pelletizing,2016,41(1):36.)
[11] 于鸿宾,潘建,朱德庆,等.高压辊磨强化高镁磁铁矿球团工艺及机理[J].中南大学学报,2016,47(5):1465.(Yu H B,Pan J,Zhu D Q,et al.Strengthening in processing and mechanism of magnetite with high MgO content pellets by high pressure grinding roller[J].Journal of Central South University,2016,47(5):1465.)
[12] 吴钢生,边美柱,沈峰满.碱性含镁球团矿的应用及合理炉料结构研究[J].钢铁,2006,41(12):19.(Wu G S,Bian M Z,Shen F M.Use of magnesium-bearing basic pellets and reasonable burden design[J].Iron and Steel,2006,41(12):19.)
[13] 青格勒,吴铿,刘洪松,等.焙烧温度对低硅含镁球团矿还原膨胀率的影响及机理[J].中国有色金属学报,2015,25(10):2905.(Qing G L,Wu K,Liu H S,et al.Effect and mechanism of calcination temperature on reduction swelling rate of low silica magnesium pellets[J].The Chinese Journal of Nonferrous Metals,2015,25(10):2905.)
[14] 尚策,周明顺,翟立委,等.双层复合熔剂性球团的开发研究[J].材料与冶金学报,2010,9(2):79.(Shang C,Zhou M S,Zhai L W,et al.Development of complex fluxed pellets with double layer structure[J].Journal of Materials and Metallurgy,2010,9(2):79.)
[15] 张金良.熔剂性赤铁矿球团焙烧特性及高炉还原行为研究[D]//长沙:中南大学,2012.(Zhang J L.Roasting Characteristics and Reduction Behaviors of Fluxed Brazilian Hematite Oxidized Pellets[D]//Changsha:Central South University,2012.)
[16] 李国玮,王学蜂.首钢熔剂性球团矿的试验研究[J].首钢科技,2002(3):17.(Li G W,Wang X F.Study on pellets with fluxes agent at ShouGang [J].Technology of Shougang,2002(3):17.)
[17] 张永明.含MgO熔剂性球阿矿特点及生产实践[J].烧结球团,1998,23(2):1.(ZhangY M.Characteristic and production practice of fluxed pellets contents MgO[J].Sintering and Industry Palletizing,1998,23(2):1.)
[18] 傅菊英,朱德庆.铁矿氧化球团基本原理、工艺及设备[M].长沙:中南大学出版社,2005.(Fu J Y,Zhu D Q.Process and Equipment of Iron Ore Pellets Production [M].Changsha:Central South University Press,2005.)
[19] 姜涛.烧结球团生产技术手册[M].北京:冶金工业出版社,2014.(Jiang T.Production and Technology Manual of Sinter and Pellets [M].Beijing:Metallurgical Industry Press,2014.)
[20] 黄柱成.铁矿造块研究方法[M].长沙:中南大学出版社,2015.(Huang Z C.Research Methodology on Agglomeration of Iron Ores[M].Changsha:Central South University Industry Press,2015.)
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