TiO_2对京唐高炉渣性能的影响及热力学分析
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摘要
为明确TiO_2对京唐炉渣性能的影响机理,基于京唐高炉渣的实际成分,通过黏度试验研究了TiO_2对炉渣黏度及熔化性温度的影响;同时利用FactSage热力学软件,计算了不同TiO_2质量分数炉渣的活度、熔化温度,液相区以及炉渣从1500冷却到1000℃时的物相变化。试验结果表明,炉渣的黏度和熔化性温度随着渣中TiO_2质量分数的增加而降低。FactSage计算表明,炉渣中TiO_2活度增大,炉渣的黏度随之减小;TiO_2增多有利于降低炉渣的熔化温度和扩大液相区,但当w(TiO_2)由4.2%变化到5.6%时,炉渣的液相区反而在CaO区域缩小;炉渣结晶相的变化表明渣中TiO_2不宜过多,否则在高温时就容易生成钙钛矿相,从而增大炉渣的黏度,不利于高炉顺行。为满足京唐高炉冶炼对炉渣性能的要求及护炉的需要,炉渣中w(TiO_2)应控制在5.0%以内。
In order to clarify the impact mechanism of TiO_2 on the performance of Jingtang blast furnace slag,based on the actual composition of Jingtang blast furnace slag,the influences of TiO_2 on viscosity and melting temperature of slags were investigated through viscosity test. Furthermore,the activity,liquidus temperature,liquid region and phase change of slag from 1 500 to 1 000 ℃ were calculated by using Fact Sage thermodynamic software. The viscosity experimental result indicates that the viscosity and melting temperature of slag decrease with the increase of mass percent of TiO_2.The calculation results from Fact Sage show that the viscosity decreases with the increase of TiO_2 activity;the increase of mass percent of TiO_2 could reduce the liquidus temperature and expand the liquid region in MgO and Al_2O_3 region,however the slag liquid region in Ca O region isreduced when TiO_2 changes from 4.2% to 5.6%. The transformation of the crystalline phase indicatesthat the perovskite is easy to generate at high temperature when TiO_2 is too much,which can increase the viscosity of the slag and it is not conducive to the blast furnace operation. In order to ensure the fluidity of Jingtang slag and meet the requirement of furnace maintenance,the mass percent of TiO_2 in slag should be controlled within 5%.
In order to clarify the impact mechanism of TiO_2 on the performance of Jingtang blast furnace slag,based on the actual composition of Jingtang blast furnace slag,the influences of TiO_2 on viscosity and melting temperature of slags were investigated through viscosity test. Furthermore,the activity,liquidus temperature,liquid region and phase change of slag from 1 500 to 1 000 ℃ were calculated by using Fact Sage thermodynamic software. The viscosity experimental result indicates that the viscosity and melting temperature of slag decrease with the increase of mass percent of TiO_2.The calculation results from Fact Sage show that the viscosity decreases with the increase of TiO_2 activity;the increase of mass percent of TiO_2 could reduce the liquidus temperature and expand the liquid region in MgO and Al_2O_3 region,however the slag liquid region in Ca O region isreduced when TiO_2 changes from 4.2% to 5.6%. The transformation of the crystalline phase indicatesthat the perovskite is easy to generate at high temperature when TiO_2 is too much,which can increase the viscosity of the slag and it is not conducive to the blast furnace operation. In order to ensure the fluidity of Jingtang slag and meet the requirement of furnace maintenance,the mass percent of TiO_2 in slag should be controlled within 5%.
引文
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[2]陈艳波,张贺顺,郭艳永,等.首钢京唐高炉炼铁技术的进步[J].炼铁,2016,35(3):42.(CHEN Yan-bo,ZHANG He-shun,GUO Yan-yong,et al.Process of Shougang Jingtang ironmaking technology[J].Ironmaking,2016,35(3):42.)
[3]张贺顺,许仁泽,张建良,等.首钢京唐高炉渣脱硫性能研究[J].钢铁研究,2016,44(5):14.(ZHANG He-shun,XU Renze,ZHANG Jian-liang,et al.Study on desulfurization properties of blast furnace slag in Shougang Jingtang United Iron and Steel Co.,Ltd.[J].Research on Iron and Steel,2016,44(5):14.)
[4]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.(XU Ren-ze,ZHANG He-shun,ZHANG Jian-liang,et al.Evaluation of Jingtang blast furnace slag properties and analysis of low Mg O slag performance[J].China Metallurgy,2016,26(11):16.)
[5]WANG Z,SHU Q F,CHOU K C.Viscosity of fluoride-free mold fluxes containing B2O3and Ti O2[J].Steel Research International,2013,84(8):766.
[6]Park H,Park J Y,Kim G H,et al.Effect of Ti O2on the viscosity and slag structure in blast furnace type slags[J].Steel Research International,2012,83(2):150.
[7]LIAO J L,LI J,WANG X D,et al.Influence of Ti O2and basicity on viscosity of Ti bearing slag[J].Ironmaking and Steelmaking,2012,39(2):133.
[8]郭德勇,张杰,鲁德昌,等.碱度对Ca O-Si O2-Al2O3-Mg O-Ti O2渣系黏度的影响[J].钢铁,2014,49(10):13.(GUO De-yong,ZHANG Jie,LU De-chang,et al.Effect of R on viscosity of Ca O-Si O2-Al2O3-Mg O-Ti O2in blast furnace slags[J].Iron and Steel,2014,49(10):13.)
[9]赵国鸿,张淑会,兰臣臣.钛化物对中钛高炉渣流动性能的影响[J].钢铁钒钛,2015,36(6):74.(ZHAO Guo-hong,ZHANG Shu-hui,LAN Chen-chen.Effect of titanium compounds on the fluidity of medium-titaniumslag of blast furnace[J].Iron Steel Vanadium Titanium,2015,36(6):74.)
[10]彭波,吴光亮,代宾,等.含钛高炉渣熔化性温度的试验研究[J].金属材料与冶金工程,2012,40(1):18.(PENG Bo,WUGuang-liang,DAI Bin,et al.Study on meltingtemperature of Titanium-bearing blast furnace slag[J].Metal Materials and Metallurgy Engineering,2012,40(1):18.)
[11]王筱留.钢铁冶金学:炼铁部分[M].二版.北京:冶金工业出版社,2000.(WANG Xiao-liu.Iron and Steel Metallurgy:Ironmaking[M].2nd.Beijing:Metallurgical Industry Press,2000.)
[12]文玲,张金柱.含钛高炉渣性能的研究进展[J].钢铁研究学报,2011,23(5):1.(WEN Ling,ZHANG Jin-zhu.Properties on titanium-bearing blast furnace slag[J].Journal of Iron and Steel Research,2011,23(5):1.)
[13]张金柱,施丽丽,敖万忠.高炉高铝低钛渣的熔化性[J].钢铁研究学报,2010,22(4):16.(ZHANG Jin-zhu,SHI Li-li,AO Wan-zhong.Study on melting property of high-alumina and low-titania BF slag[J].Journal of Iron and Steel Research,2010,22(4):16.)
[14]曹战民,宋晓艳,乔芝郁.热力学模拟计算软件Fact Sage及其应用[J].稀有金属,2008,32(2):216.(CAO Zhan-min,SONG Xiao-yan,QIAO Zhi-yu.Thermodynamic modeling software Fact Sage and its application[J].Chinese Journal of Rare Metals,2008,32(2):216.)
[15]Shankar A,Gornerup M,Lahiri A K,et al.Experimental investigation of the viscosities in Ca O-Si O2-Mg O-Al2O3and Ca O-Si O2-Mg O-Al2O3-Ti O2slags[J].Metallurgical and Materials Transactions:B,2007,38(6):911.