MgO-Al_2O_3类夹杂物钙处理热力学及工业试验研究
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- 英文论文题名：Thermodynamic and Industrial Study on the Calcium Treatment of MgO-Al_2O_3 Inclusions
- 论文作者：李超 ; 张立峰 ; 杨文 ; 景财良
- 英文论文作者：Chao Li ; Lifeng Zhang ; Wen Yang ; Cailiang Jing ; School of Metallurgical and Ecological Engineering ; University of Science and Technology Beijing ; Steelmaking Department ; Shougang Jingtang United Iron&Steel Corporation Limited
- 年：2016
- 作者机构：北京科技大学冶金与生态工程学院;首钢京唐钢铁联合责任有限公司炼钢部;
- 论文关键词：FactSage ; 钙处理 ; MgO-Al_2O_3夹杂物 ; 改性
- 英文论文关键词：FactSage ; Ca treatment ; MgO-Al_2O_3 inclusions ; inclusion modification
- 会议召开时间：2016-05-19
- 会议录名称：第十九届（2016年）全国炼钢学术会议大会报告及论文摘要集
- 语种：中文
- 分类号：TF703
- 学会代码：ZGJS
- 会议名称：第十九届（2016年）全国炼钢学术会议
- 会议地点：中国湖南长沙
- 主办单位：中国金属学会炼钢分会
- 学会名称：中国金属学会
- 页数：1
- 文件大小：95k
- 原文格式：O
- 会议级别：全国
摘要
铝镇静钢的生产中因为渣线耐材侵蚀,钢中不可避免的生成MgO-Al_2O_3类夹杂物,此类夹杂物很容易引起水口结瘤。减少此类夹杂物危害的方式之一是钙处理。许多冶金学者用不同的方式对钙处理过程中此类夹杂物的改性进行了热力学的计算和实验室实验。本文利用热力学软件FactSage 6.4对钙处理过程中MgO-Al_2O_3类尖晶石夹杂物改性进行了模拟,提出了可能的MgO-Al_2O_3类夹杂物的改性机理,同时对国内某厂Al脱氧钙处理钢在冶炼过程中夹杂物的演变规律进行了取样调研。计算结果表明了钢中不同T.Mg含量对铝镇静钢中夹杂物改性所需喂钙量的影响,在T=1823K,[A1]_t=300ppm,[S]=12 ppm,T.O.=15 ppm的条件下,钢中T.Mg含量在4 ppm时,达到50%液相所需喂钙量最小;钢中T.Mg含量在2ppm时,达到100%液相所需喂钙量最小。T.Mg≥6 ppm时,100%液态窗口消失,T.Mg≥16 ppm时,50%的液态窗口消失。工厂调研结果证实了钙处理对MgO-Al_2O_3类夹杂物改性的有效性,夹杂物平均成分到达50%液相区以内,100%液相区边缘。
The formation of MgO-Al_O_3 inclusions,wich are easy to cause nozzle clogging,are inevitable in Al-Kined steer aue to the erosion of MgO based refractory.Calcium treatment is a effective way to reduce the hazard of this type inclusions.A number of thermodynamic calculations and laboratory experiments were carried out with different methods on the modification of spinel inclusions by Ca treatment.In the current work,the composition and phase evolution of MgO-Al_2O_3 type spinel inclusions during Ca-treatment were simulated using FactSage 6.4.A possible modification mechanism was proposed.Industrial trials were also carried out to investigate the inclusion evolution in Al killed steel after Ca treatment.The results of thermodynamic calculation showed the effect of T.Mg on the required T.Ca for inclusion modification in Al-killed steel.Under the condition of T=1823 K,[Al]_t=300 ppm,[S]=12 ppm and T.O.=15 ppm,when T.Mg=4 ppm,the required T.Ca is minimum to achieve 50%liquid,while T.Mg=2 ppm connects with minimum T.Ca to achieve 100%liquid.In addition,when T.Mg ≥ 6 ppm,the 100%liquid window disappear,and when T.Mg ≥ 16 ppm,the 50%liquid window disappear.The results of industrial trials verified the effectiveness of Ca treatment on MgO-Al_2O_3 inclusions.The average composition of inclusions entered into the 50%liquid zone,and was near the edge of 100%liquid zone.
The formation of MgO-Al_O_3 inclusions,wich are easy to cause nozzle clogging,are inevitable in Al-Kined steer aue to the erosion of MgO based refractory.Calcium treatment is a effective way to reduce the hazard of this type inclusions.A number of thermodynamic calculations and laboratory experiments were carried out with different methods on the modification of spinel inclusions by Ca treatment.In the current work,the composition and phase evolution of MgO-Al_2O_3 type spinel inclusions during Ca-treatment were simulated using FactSage 6.4.A possible modification mechanism was proposed.Industrial trials were also carried out to investigate the inclusion evolution in Al killed steel after Ca treatment.The results of thermodynamic calculation showed the effect of T.Mg on the required T.Ca for inclusion modification in Al-killed steel.Under the condition of T=1823 K,[Al]_t=300 ppm,[S]=12 ppm and T.O.=15 ppm,when T.Mg=4 ppm,the required T.Ca is minimum to achieve 50%liquid,while T.Mg=2 ppm connects with minimum T.Ca to achieve 100%liquid.In addition,when T.Mg ≥ 6 ppm,the 100%liquid window disappear,and when T.Mg ≥ 16 ppm,the 50%liquid window disappear.The results of industrial trials verified the effectiveness of Ca treatment on MgO-Al_2O_3 inclusions.The average composition of inclusions entered into the 50%liquid zone,and was near the edge of 100%liquid zone.
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