首钢A高炉炉渣降低MgO的热力学分析
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摘要
为了研究首钢A高炉炉渣降低MgO的可行性,利用FactSage热力学软件,从理论上解析首钢A高炉炉渣中MgO对固相析出温度和黏度的影响。研究发现,A高炉炉渣固相析出温度在1 400℃左右,炉渣在高炉炉缸中全为液相并具有较好的流动性。1 500℃下,现有炉渣组分在相图中液相区,若MgO含量降低,炉渣仍处在液相区。MgO质量分数在2.87%～7.37%区间变化时,随MgO含量升高,固相析出温度增加;MgO质量分数升高1%,炉渣固相析出温度升高约3.73℃。随MgO含量升高,炉渣黏度降低。1 500℃下,MgO质量分数升高1%时,炉渣黏度降低0.014Pa·s。分析认为,炉缸热状态较好(铁水温度在1 480℃以上)时,适当降低MgO质量分数至6%,炉渣黏度不会受较大影响;炉缸热状态较差(铁水温度在1 480℃以下)时,不建议降低MgO含量。
With the trend of large-size of blast furnace,the higher demands for the slag property,especially the mobility and stability in high temperature were put forward in production.The appropriate melting temperature and viscosity were required for the blast furnace smelting.Based on the thermodynamic software FactSage,the effects of the MgO content on the liquidus temperature and viscosity of the slag for blast furnace A of Shougang were analyzed.The results showed that liquidus temperature is about 1 400 ℃ of the slag for blast furnace A,and the slag was fully liquid and had a good mobility.The slag composition was in the liquid phase region at 1 500 ℃.If reducing the MgO content,the slag was still in the liquid phase region.When the MgO mass fraction was in the range of2.87%-7.37%,the liquidus temperature increased with the increase of the MgO content.And when increasing the MgO mass fraction of 1%,the slag liquidus temperature increased 3.73℃.The slag viscosity reduced with increasing the MgO content.And the slag viscosity reduced 0.014 Pa·s with increasing the MgO mass fraction of 1%.It was considered when the hearth heat condition was good(hot metal temperature above 1 480℃),reducing the MgO mass fraction to 6% had little impact on the slag viscosity.But when the hearth heat condition was bad(hot metal temperature is below 1 480 ℃),reducing the reduction of the MgO content was not recommended.
With the trend of large-size of blast furnace,the higher demands for the slag property,especially the mobility and stability in high temperature were put forward in production.The appropriate melting temperature and viscosity were required for the blast furnace smelting.Based on the thermodynamic software FactSage,the effects of the MgO content on the liquidus temperature and viscosity of the slag for blast furnace A of Shougang were analyzed.The results showed that liquidus temperature is about 1 400 ℃ of the slag for blast furnace A,and the slag was fully liquid and had a good mobility.The slag composition was in the liquid phase region at 1 500 ℃.If reducing the MgO content,the slag was still in the liquid phase region.When the MgO mass fraction was in the range of2.87%-7.37%,the liquidus temperature increased with the increase of the MgO content.And when increasing the MgO mass fraction of 1%,the slag liquidus temperature increased 3.73℃.The slag viscosity reduced with increasing the MgO content.And the slag viscosity reduced 0.014 Pa·s with increasing the MgO mass fraction of 1%.It was considered when the hearth heat condition was good(hot metal temperature above 1 480℃),reducing the MgO mass fraction to 6% had little impact on the slag viscosity.But when the hearth heat condition was bad(hot metal temperature is below 1 480 ℃),reducing the reduction of the MgO content was not recommended.
引文
[1]Giedroye V,Mitchell J G.Controlling the sulphur content of iron[J].Journal of the Iron and Steel Institute,1964(1):11.
[2]刘杰,赵东明,李建军,等.鞍钢高炉低镁渣冶炼技术研究与应用[J].钢铁,2018,53(3):22.
[3]邓美乐,韩秀丽,刘磊,等.MgO对中钛型高炉渣矿相结构及冶金性能的影响[J].钢铁,2016,51(4):14.
[4]王志宇,张建良,张邦志,等.高镁铝高炉渣的冶金性能[J].中国冶金,2016,26(4):15.
[5]许仁泽,张贺顺,张建良,等.京唐高炉渣性能评价及低镁渣性能分析[J].中国冶金,2016,26(11):16.
[6]何环宇,王庆祥,韩秋影.MgO含量对高炉渣性能的影响研究[J].武汉科技大学学报:自然科学版,2006(1):5.
[7]蒋大军,林千谷,何木光,等.MgO对烧结矿与高炉渣冶炼性能及工艺参数影响的试验[J].中国冶金,2010,20(1):35.
[8]孙长余,陈亚春,李静,等.MgO对高铝高炉渣脱硫的影响及其动力学分析[J].重庆大学学报,2016,39(4):82.
[9]沈峰满,温秋林,姜鑫,等.国内外高炉炉渣(MgO)/(Al2O3)的对比分析[J].炼铁,2015,34(2):1.
[10]李仁生,赵仕清,张晓林,等.MgO对重钢高炉渣冶金性能的影响[J].炼铁,2014,33(6):33.
[11]Takashi Orimoto,Toshinosuke Noda,Morimasa Ichida,et al.Desulfurization technology in the blast furnace raceway by MgO-SiO2flux injection[J].ISIJ International,2008,48(2):141.
[12]Noda Toshinosuke,Nagasaka Tetsuya,Orimoto Takashi.A behavior of MgO in high temperature zone of blast furnace[J].Report of the ISIJ Meeting,2005,18(1):98.
[13]Orewczyk J.Model studies of doped iron oxides reduction process of magnetite doubly doped with calcium and magnesium[J].Journal of Thermal Analysis and Calorimetry,2006(1):265.
[14]张玉柱,耿明山,项利,等.MgO含量和碱度对高炉渣的黏度的影响[J].材料与冶金学报,2005(4):253.
[15]茅沈栋,杜屏.降低MgO含量对高炉渣黏度和熔化性温度的影响[J].钢铁研究学报,2015,27(9):33.
[16]刘超,张玉柱,康月.FactSage计算MgO含量对高炉渣粘度的影响[J].河北联合大学学报:自然科学版,2014,36(4):25.
[2]刘杰,赵东明,李建军,等.鞍钢高炉低镁渣冶炼技术研究与应用[J].钢铁,2018,53(3):22.
[3]邓美乐,韩秀丽,刘磊,等.MgO对中钛型高炉渣矿相结构及冶金性能的影响[J].钢铁,2016,51(4):14.
[4]王志宇,张建良,张邦志,等.高镁铝高炉渣的冶金性能[J].中国冶金,2016,26(4):15.
[5]许仁泽,张贺顺,张建良,等.京唐高炉渣性能评价及低镁渣性能分析[J].中国冶金,2016,26(11):16.
[6]何环宇,王庆祥,韩秋影.MgO含量对高炉渣性能的影响研究[J].武汉科技大学学报:自然科学版,2006(1):5.
[7]蒋大军,林千谷,何木光,等.MgO对烧结矿与高炉渣冶炼性能及工艺参数影响的试验[J].中国冶金,2010,20(1):35.
[8]孙长余,陈亚春,李静,等.MgO对高铝高炉渣脱硫的影响及其动力学分析[J].重庆大学学报,2016,39(4):82.
[9]沈峰满,温秋林,姜鑫,等.国内外高炉炉渣(MgO)/(Al2O3)的对比分析[J].炼铁,2015,34(2):1.
[10]李仁生,赵仕清,张晓林,等.MgO对重钢高炉渣冶金性能的影响[J].炼铁,2014,33(6):33.
[11]Takashi Orimoto,Toshinosuke Noda,Morimasa Ichida,et al.Desulfurization technology in the blast furnace raceway by MgO-SiO2flux injection[J].ISIJ International,2008,48(2):141.
[12]Noda Toshinosuke,Nagasaka Tetsuya,Orimoto Takashi.A behavior of MgO in high temperature zone of blast furnace[J].Report of the ISIJ Meeting,2005,18(1):98.
[13]Orewczyk J.Model studies of doped iron oxides reduction process of magnetite doubly doped with calcium and magnesium[J].Journal of Thermal Analysis and Calorimetry,2006(1):265.
[14]张玉柱,耿明山,项利,等.MgO含量和碱度对高炉渣的黏度的影响[J].材料与冶金学报,2005(4):253.
[15]茅沈栋,杜屏.降低MgO含量对高炉渣黏度和熔化性温度的影响[J].钢铁研究学报,2015,27(9):33.
[16]刘超,张玉柱,康月.FactSage计算MgO含量对高炉渣粘度的影响[J].河北联合大学学报:自然科学版,2014,36(4):25.