Al_(2)O_(3)和MgO含量对高炉渣熔化和流动性能的影响研究  

Influence of Al_(2)O_(3)and MgO Content on Melting and Flow Properties of Blast Furnace Slag

作　　者：潘玉柱 徐益军 郑林 赵改革 袁骧 刘志伟 PAN Yuzhu;XU Yijun;ZHENG Lin;ZHAO Gaige;YUAN Xiang;LIU Zhiwei(Xiangtan Iron&Steel Group Co.,Ltd.,Xiangtan 411100,China;Hunan Institute of Engineering,Xiangtan 411100,China)

机构地区：[1]湘潭钢铁集团有限公司,湖南湘潭411100 [2]湖南工程学院,湖南湘潭411100

出　　处：《金属材料与冶金工程》2023年第6期31-37,44,共8页Metal Materials and Metallurgy Engineering

摘　　要：本研究针对高炉渣中Al_(2)O_(3)含量升高,应用实验和热力学计算等研究方法,系统研究了在碱度1.2的情况下,w(Al_(2)O_(3))=(14~18)%和w(MgO)=(6~10)%对高炉渣熔化和流动性能的影响。研究结果表明:Al_(2)O_(3)、MgO质量分数分别在(14~18)%、(6~10)%范围内波动时,热力学计算得到熔化前的物相组成为铝黄长石(Ca_(2)Al_(2)SiO_(7))和镁黄长石(Ca_(2)MgSi_(2)O_(7)),液相产生的主要路径为两者的包晶相熔化反应。当w(Al_(2)O_(3))=14%时,随着MgO含量的增加,热力学计算得到的液相线温度逐步升高;当w(Al_(2)O_(3))=(16~18)%时,随着MgO含量升高,液相线温度逐步降低,但仍然高于w(Al_(2)O_(3))=14%时液相线温度。实验熔点和熔化性温度在一定范围内小幅度波动,所研究的任一渣系的粘度能够满足高炉正常生产,并且具有进一步降低MgO含量及生产成本的潜力。1400℃时,所研究的任一渣系的最大粘度小于允许熔渣从高炉内流出的最大粘度,表明所有渣系具有抗击炉温波动的能力,同时,给出了高Al_(2)O_(3)渣冶炼时高炉的操作策略。In this paper,the effects of Al_(2)O_(3)(14%~18%)and MgO(6%~10%)on the melting properties and flow properties of blast furnace slag were systematically studied under the condition of basicity 1.2 by using experimental and thermodynamic calculation methods as Al_(2)O_(3)content in slag increased.The research results show that when Al_(2)O_(3)and MgO fluctuate in the range of 14%~18%and 6%~10%,respectively,the thermodynamic calculation shows that the phase composition before melting is Gehlenite(Ca_(2)Al_(2)SiO_(7))and Akermanite(Ca_(2)MgSiO_(7)).The main mode of liquid phase generation is the peritectic phase melting reaction.When the Al_(2)O_(3)content is 14%,the liquidus temperature increases gradually with the increase of the MgO content.When the Al_(2)O_(3)content is 16%and 18%,the liquidus temperature gradually decreases with the increase of the MgO content,but it is still higher than the liquidus temperature when the Al_(2)O_(3)content is 14%.The experimental melting point and melting temperature fluctuated slightly within a certain range.The viscosity of any slag system studied can meet the normal production of blast furnace,and it has the potential to further reduce the MgO content and reduce the production cost.At 1400℃,the maximum viscosity of any of the studied slag systems is less than the maximum viscosity that allows molten slag to flow out of the blast furnace,indicating that all slag systems have the ability to resist temperature fluctuations.

关 键 词：高炉渣 高铝矿 熔化性温度 粘度 

分 类 号：TF534.1[冶金工程—钢铁冶金]