第36卷增刊1 北京科技大学学报 Vol.36 Suppl.1 2014年4月 Journal of University of Science and Technology Beijing Apr.2014 Ca0一A山，O3Si02-Mg0渣系精炼行为的热力学预测 田冬东”，张延玲)四，刘庆波)，闻昕舒》 1)北京科技大学钢铁治金新技术国家重点实验室，北京100083 2)南阳汉治钢铁有限公司，河南473000 3)中钢集团吉林铁合金股份有限公司，吉林132002 ☒通信作者，E-mail:zhangyanling(@metall.ustb.cdu.cn 摘要采用热力学软件FactSage对Ca0一A山，0，SiO2-Mg0四元系夹杂物的低熔点区域面积进行了分析计算，发现其低熔点 区域可以根据碱度的不同分为两个区域，利用KTH模型对这两个低熔点区域内的硫容量进行了计算比较，并结合临氢钢 12C2Mo1R对钢液成分及脱疏的要求，对其适用的低熔点区域进行了讨论.结果表明：如将夹杂物控制在碱度高的低熔点区 域，则Ca0的质量分数在30%左右，A山20，在15%左右，Mg0在10%左右，Si02大于40%，且Si02越多，低熔点区面积越大：如 果将夹杂物成分控制在低碱度区域，则C0在50%左右，A山，0，在45%左右，Mg0的质量分数在5%左右，Si02的质量分数小 于5%.高碱度低熔点区的硫容量明显小于低碱度低熔点区，在两个低熔点区内，硫容量均随碱度的增加而增加，且钙铝比越 大，硫容量随碱度增加的幅度越大：对于临氢钢12C2Mo1R来说，应将C0-A山，0，SiO2-Mg0四元系夹杂物控制在高碱度低 熔点区域，且碱度和钙铝比越大越好。 关键词夹杂物：熔点：碱度：钙铝比：KTH模型；硫容量 分类号TF769.2 Thermodynamic optimization of the CaO-Al,O,-SiO,-MgO slag system TIAN Dong-dong”',ZHANG Yan--4ing》,LIU Qing-bo2》,WEN Xin--shm》 1)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China 2)Nanyang Hanye Iron and Steel Co.Lid.,Nanyang 473000,China 3)Sinosteel Jilin Ferroalloys Co.Lid.Jilin 132002,China Corresponding author,E-mail:zhangyanling@metall.ustb.edu.cn ABSTRACT The low melting point zone of CaO-Al2 O,SiO,Mgo inclusions was analyzed and calculated by thermodynamic software FactSage.It is found that the low melting point zone can be divided into two different areas by alkalinity,and the sulfur capacity of the two areas was calculated and compared by using the KTH model.Then combined with the requirements of critical hydrogen 12Cr2MolR on compositions and desulfurization,its applicable low-melting region was discussed.The results show that if inclusions are controlled at the high alkalinity zone,the contents (mass fraction)of Ca0,Al2O3,and Mgo are about 30%,15%,and 10%,respectively,the content of SiO should be more than 40%,and it has a lager low melting point zone with higher Si0 content.If inclusions are con- trolled at the low alkalinity zone,the contents of Cao,Al2,and Mgo are about 50%,45%,and 5%,respectively,the content of SiO should be less than 5%.The sulfur capacity of the high alkalinity area is significantly less than that of the low alkalinity area.In both low melting point areas,the sulfur capacity is increased with the increase of alkalinity.The bigger the calcium/aluminum ratio is, the greater the sulfur capacity is increased with the increase of alkalinity.For the critical hydrogen 12Cr2MolR,CaO-Al O-SiO-Mgo inclusions should be controlled in the low melting point zone with high alkalinity,and higher alkalinity and calcium/aluminum ratio are better. KEY WORDS inclusions:melting point;alkalinity:calcium/aluminum ratio:KTH model:sulfur capacity 收稿日期：2013-11-21 DOI:10.13374/j.issn1001-053x.2014.s1.024:http://jourals.ustb.edu.cn第 36 卷 增刊 1 2014 年 4 月 北京科技大学学报 Journal of University of Science and Technology Beijing Vol． 36 Suppl． 1 Apr． 2014 CaO--Al2O3 --SiO2 --MgO 渣系精炼行为的热力学预测 田冬东1) ，张延玲1) ，刘庆波2) ，闻昕舒3) 1) 北京科技大学钢铁冶金新技术国家重点实验室，北京 100083 2) 南阳汉冶钢铁有限公司，河南 473000 3) 中钢集团吉林铁合金股份有限公司，吉林 132002  通信作者，E-mail: zhangyanling@ metall． ustb． edu． cn 摘 要 采用热力学软件 FactSage 对 CaO--Al2O3--SiO2--MgO 四元系夹杂物的低熔点区域面积进行了分析计算，发现其低熔点 区域可以根据碱度的不同分为两个区域，利用 KTH 模型对这两个低熔点区域内的硫容量进行了计算比较，并结合临氢钢 12Cr2Mo1Ｒ 对钢液成分及脱硫的要求，对其适用的低熔点区域进行了讨论． 结果表明: 如将夹杂物控制在碱度高的低熔点区 域，则 CaO 的质量分数在 30% 左右，Al2O3 在 15% 左右，MgO 在 10% 左右，SiO2 大于 40% ，且 SiO2 越多，低熔点区面积越大; 如 果将夹杂物成分控制在低碱度区域，则 CaO 在 50% 左右，Al2O3 在 45% 左右，MgO 的质量分数在 5% 左右，SiO2 的质量分数小 于 5% ． 高碱度低熔点区的硫容量明显小于低碱度低熔点区，在两个低熔点区内，硫容量均随碱度的增加而增加，且钙铝比越 大，硫容量随碱度增加的幅度越大; 对于临氢钢 12Cr2Mo1Ｒ 来说，应将 CaO--Al2O3--SiO2--MgO 四元系夹杂物控制在高碱度低 熔点区域，且碱度和钙铝比越大越好． 关键词 夹杂物; 熔点; 碱度; 钙铝比; KTH 模型; 硫容量 分类号 TF769. 2 Thermodynamic optimization of the CaO-Al2O3-SiO2-MgO slag system TIAN Dong-dong1) ，ZHANG Yan-ling1)  ，LIU Qing-bo 2) ，WEN Xin-shu3) 1) State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China 2) Nanyang Hanye Iron and Steel Co． Ltd． ，Nanyang 473000，China 3) Sinosteel Jilin Ferroalloys Co． Ltd． ，Jilin 132002，China  Corresponding author，E-mail: zhangyanling@ metall． ustb． edu． cn ABSTＲACT The low melting point zone of CaO-Al2O3-SiO2-MgO inclusions was analyzed and calculated by thermodynamic software FactSage． It is found that the low melting point zone can be divided into two different areas by alkalinity，and the sulfur capacity of the two areas was calculated and compared by using the KTH model． Then combined with the requirements of critical hydrogen 12Cr2Mo1Ｒ on compositions and desulfurization，its applicable low-melting region was discussed． The results show that if inclusions are controlled at the high alkalinity zone，the contents ( mass fraction) of CaO，Al2O3，and MgO are about 30% ，15% ，and 10% ，respectively，the content of SiO2 should be more than 40% ，and it has a lager low melting point zone with higher SiO2 content． If inclusions are con￾trolled at the low alkalinity zone，the contents of CaO，Al2O3，and MgO are about 50% ，45% ，and 5% ，respectively，the content of SiO2 should be less than 5% ． The sulfur capacity of the high alkalinity area is significantly less than that of the low alkalinity area． In both low melting point areas，the sulfur capacity is increased with the increase of alkalinity． The bigger the calcium/aluminum ratio is， the greater the sulfur capacity is increased with the increase of alkalinity． For the critical hydrogen 12Cr2Mo1Ｒ，CaO-Al2O3-SiO2-MgO inclusions should be controlled in the low melting point zone with high alkalinity，and higher alkalinity and calcium/aluminum ratio are better． KEY WOＲDS inclusions; melting point; alkalinity; calcium/aluminum ratio; KTH model; sulfur capacity 收稿日期: 2013--11--21 DOI: 10． 13374 /j． issn1001--053x． 2014． s1． 024; http: / /journals． ustb． edu． cn