工程科学学报，第37卷，第11期：1415-1421,2015年11月 Chinese Journal of Engineering,Vol.37,No.11:1415-1421,November 2015 DOI:103374/j.issn2095-9389.2015.11.004:http://joumals.ustb.edu.cn 低碳含铝钢20Mn2精炼渣系Ca0-SiO2-Al,03-Mg0-CaF, 的优化 郭宝奇，包燕平四，王敏，林路 北京科技大学钢铁治金新技术国家重点实验室，北京100083 ☒通信作者，E-mail:baoyp@usth.eu.cn 摘要通过对低碳含铝钢20Mn2精炼过程的取样分析，得出精炼渣的熔化温度偏高，渣中存在大量固相C0,并导致钢中 含有Ca0类夹杂物，精炼渣吸附夹杂物能力差.利用FactSage热力学计算，从渣的低熔点区域控制和渣一钢反应这两个方面 对渣系进行研究与优化.结果表明，C0/Al203质量比在1.5左右添加质量分数为3%CaF2可以有效降低渣的熔化温度，渣 的熔化温度随着CF,含量的升高呈现先降低后升高的趋势，Mg0的质量分数控制5%左右低熔点区域面积达到最大.在 Si02质量分数大于30%区域，钢中氧含量大体上随着C0/AL,0,质量比的增加而降低，在Si02的质量分数低于30%区域随 着C0含量的升高而降低，钢中酸溶铝含量在SiO2含量高的区域随着Al,O,/SiO2质量比的增加而升高，在SiO2含量低的区 域随着C0/Si02质量比的增加而增加.根据热力学分析结果得出合理的渣系范围：Ca050%~60%,A,0320%-35%, Si025%~10%,Mg05%-8%,CF20-5%.优化渣系的实验结果表明，优化后渣系熔化温度降低，钢中夹杂物数量、面积 和平均尺寸均有明显下降. 关键词炼钢：精炼：渣系；优化：液相线温度：夹杂物 分类号TF769.2 Optimization of Cao-SiO,-Al,O,-MgO-CaF,refining slag in low-carbon and aluminum-containing 20Mn2 steel GUO Bao-qi,BAO Yan-ping,WANG Min,LIN Lu State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:baoyp@ustb.edu.cn ABSTRACT Through analysis of samples taken in the refining process of low carbon and aluminum containing 20Mn2 steel,it was found that the melting point of the refining slag was high,substantial solid Cao and CaO-type inclusions existed in the steel and slag, leading to a decrease in absorption capacity of inclusions in the molten slag.Based on thermodynamic calculations utilizing FactSage software,the slag system was investigated and optimized by integrating the control of low-melting-point regions and reactions between slag and steel.The results show that 3%CaF2 addition can decrease the melting temperature of the slag with CaO/Al,O,mass ratio around 1.5,and the melting point of the slag exhibits an initial decline and a subsequent rise with increasing CaF content.The largest low-melting-point region is obtained through governing the Mgo content in a vicinity of 5%.The oxygen content in the steel decreases with increasing Ca/Al2O mass ratio in the region of SiO,exceeding 30%,and decreases with increasing Ca0 content in the region of SiO lower than 30%.The acid-soluble aluminum content increases with increasing Al2O/SiO mass ratio in the region of high SiO content and increasing CaO/SiO,mass ratio in the region of low SiO,content.According to results from thermodynamic analysis,the optimized slag can be given as 50%-60%Ca0,20%-35%Al2O3,5%-10%Si02,5%-8%Mgo,and 0-5%CaF2.Experi- 收稿日期：201407-06 基金项目：国家自然科学基金资助项目(51274029)：钢铁治金新技术国家重点实验室开发基金资助项目(KF13-09)工程科学学报，第 37 卷，第 11 期: 1415--1421，2015 年 11 月 Chinese Journal of Engineering，Vol． 37，No． 11: 1415--1421，November 2015 DOI: 10． 13374 /j． issn2095--9389． 2015． 11． 004; http: / /journals． ustb． edu． cn 1992) 低碳含铝钢 20Mn2 精炼渣系 CaO--SiO2 --Al2O3 --MgO--CaF2 的优化 郭宝奇，包燕平，王 敏，林 路 北京科技大学钢铁冶金新技术国家重点实验室，北京 100083  通信作者，E-mail: baoyp@ ustb． edu． cn 摘 要 通过对低碳含铝钢 20Mn2 精炼过程的取样分析，得出精炼渣的熔化温度偏高，渣中存在大量固相 CaO，并导致钢中 含有 CaO 类夹杂物，精炼渣吸附夹杂物能力差． 利用 FactSage 热力学计算，从渣的低熔点区域控制和渣--钢反应这两个方面 对渣系进行研究与优化． 结果表明，CaO/Al2O3 质量比在 1. 5 左右添加质量分数为 3% CaF2 可以有效降低渣的熔化温度，渣 的熔化温度随着 CaF2 含量的升高呈现先降低后升高的趋势，MgO 的质量分数控制 5% 左右低熔点区域面积达到最大． 在 SiO2 质量分数大于 30% 区域，钢中氧含量大体上随着 CaO/Al2O3 质量比的增加而降低，在 SiO2 的质量分数低于 30% 区域随 着 CaO 含量的升高而降低，钢中酸溶铝含量在 SiO2 含量高的区域随着 Al2O3 / SiO2 质量比的增加而升高，在 SiO2 含量低的区 域随着 CaO/ SiO2 质量比的增加而增加． 根据热力学分析结果得出合理的渣系范围: CaO 50% ～ 60% ，Al2O3 20% ～ 35% ， SiO2 5% ～ 10% ，MgO 5% ～ 8% ，CaF2 0 ～ 5% ． 优化渣系的实验结果表明，优化后渣系熔化温度降低，钢中夹杂物数量、面积 和平均尺寸均有明显下降． 关键词 炼钢; 精炼; 渣系; 优化; 液相线温度; 夹杂物 分类号 TF769. 2 收稿日期: 2014--07--06 基金项目: 国家自然科学基金资助项目( 51274029) ; 钢铁冶金新技术国家重点实验室开发基金资助项目( KF13--09) Optimization of CaO--SiO2 --Al2O3 --MgO--CaF2 refining slag in low-carbon and aluminum-containing 20Mn2 steel GUO Bao-qi，BAO Yan-ping ，WANG Min，LIN Lu State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: baoyp@ ustb． edu． cn ABSTＲACT Through analysis of samples taken in the refining process of low carbon and aluminum containing 20Mn2 steel，it was found that the melting point of the refining slag was high，substantial solid CaO and CaO-type inclusions existed in the steel and slag， leading to a decrease in absorption capacity of inclusions in the molten slag． Based on thermodynamic calculations utilizing FactSage software，the slag system was investigated and optimized by integrating the control of low-melting-point regions and reactions between slag and steel． The results show that 3% CaF2 addition can decrease the melting temperature of the slag with CaO/Al2O3 mass ratio around 1. 5，and the melting point of the slag exhibits an initial decline and a subsequent rise with increasing CaF2 content． The largest low-melting-point region is obtained through governing the MgO content in a vicinity of 5% ． The oxygen content in the steel decreases with increasing CaO/Al2O3 mass ratio in the region of SiO2 exceeding 30% ，and decreases with increasing CaO content in the region of SiO2 lower than 30% ． The acid-soluble aluminum content increases with increasing Al2O3 / SiO2 mass ratio in the region of high SiO2 content and increasing CaO/ SiO2 mass ratio in the region of low SiO2 content． According to results from thermodynamic analysis，the optimized slag can be given as 50% － 60% CaO，20% － 35% Al2O3，5% － 10% SiO2，5% － 8% MgO，and 0 － 5% CaF2 ． Experi-