二元碱度和镁铝比对低硼高铝渣冶金性能的影响  

Effect of binary basicity and magnesium aluminum ratio on the metallurgical properties of low boron-bearing high alumina slag

作　　者：梁子明 柳政根 储满生[4] 李淑宝 Liang Ziming;Liu Zhenggen;Chu Mansheng;Li Shubao(School of Metallurgy,Northeastern University,Shenyang 110819,China;Liaoning Low-carbon Steelmaking Technology Engineering Research Center,Northeastern University,Shenyang 110819,China;Engineering Research Center of Frontier Technologies for Low-carbon Steelmaking(Ministry of Education),Northeastern University,Shenyang 110819,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Nanjing Steel United Co.,Ltd.,Nanjing 210035,China)

机构地区：[1]东北大学冶金学院,沈阳110819 [2]辽宁省低碳钢铁前沿技术工程研究中心,沈阳110819 [3]东北大学低碳钢铁前沿技术教育部工程研究中心,沈阳110819 [4]东北大学轧制技术及连轧自动化国家重点实验室,沈阳110819 [5]南京钢铁联合有限公司,南京210035

出　　处：《材料与冶金学报》2024年第5期456-464,共9页Journal of Materials and Metallurgy

基　　金：中央高校基本科研业务费项目(N2225024);辽宁省科学技术计划项目(2022JH2/101300124)。

摘　　要：以国内某钢铁企业现场高炉渣为研究对象,系统研究了w(CaO)/w(SiO_(2))(即二元碱度R_(2))和w(MgO)/w(Al_(2)O_(3))(即镁铝比M/A)对低硼高铝渣黏度η、熔化性温度T_(Br)、黏流活化能E_(η)的影响.结果表明:当R_(2)从1.10增至1.30时,η先显著降低,之后趋于平缓,当R_(2)为1.25时,炉渣的高温(1773K)黏度η_(1)最低,为0.227 Pa·s,在此期间,炉渣中的硅铝酸盐网络结构发生解聚,T_(Br)和液相线温度均呈现升高趋势,高熔点基础物相黄长石的衍射峰强度增大,E_(η)先显著升高,再缓慢降低;当M/A从0.40增至0.65时,η先显著降低,之后趋于平缓,当M/A为0.55时,渣系的冶金性能趋于稳定,η_(1)为0.226 Pa·s,在此期间,炉渣中的硅铝酸盐网络结构发生解聚,T_(Br)和液相线温度总体均呈现降低趋势,高熔点基础物相黄长石相的衍射峰强度减小,E_(η)先缓慢降低,再显著升高.综合考虑,当R_(2)为1.25,M/A为0.55时,低硼高铝渣的η_(1),T_(Br)和E_(η)均较低,此时炉渣具有良好的冶金性能.Taking the blast furnace slag of a domestic iron and steel enterprise as the research object,the effects of w(CaO)/w(SiO_(2))(R_(2))and w(MgO)/w(Al_(2)O_(3))(M/A)on the viscosity η,melting temperature T_(Br) and activation energy of viscous flow E_(η) of low boron-bearing high-alumina slag were studied systematically.The results show that,with the increase of R_(2)from 1.10 to 1.30,η first decreases significantly and then tends to be flat.When R is 1.25,the high temperature(1773 K)viscosity η_(2)1 of the slag is the lowest,which is 0.227 Pa·s.During this period,the silico-aluminate network structure of slag is depolymerized into smaller network units.The TBr and liquidus temperature both show an increasing trend,and the diffraction peak intensity of melilite with high melting point base phase melilite increases,and E_(η) first increases significantly and then slowly decreases.When the M/A increases from 0.40 to 0.65,η first decreases significantly and then tends to be flat,and when M/A is 0.55,the metallurgical properties of the slag system tend to be stable,and η_(1) is 0.226 Pa·s.During this period,the silical-aluminate network structure of slag is depolymerized.T_(Br) nd liquidus temperature both show a downward trend.The diffraction peak intensity of the high melting point basic phase of melilite decreases,and E_(η) first decreases slowly and then increases significantly.Taking all factors into consideration,when the R_(2)is 1.25 and the M/A is 0.55,the η_(1),T_(Br) and E_(η)of the low-boron and high-aluminum slag are all low,and the slag has good metallurgical properties.

关 键 词：低硼高铝渣 二元碱度 镁铝比 黏度 

分 类 号：TF54[冶金工程—钢铁冶金]