CaO-Al2O3-MgO-SiO2-Ce2O3渣系活度计算模型
doi: 10.7513/j.issn.1004-7638.2022.04.019
Development of activity calculation model for the CaO-Al2O3-MgO-SiO2-Ce2O3 slag system
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摘要: 稀土钢冶炼过程中,含稀土钢液与熔渣间存在强烈的渣金反应,导致钢中溶解态稀土含量波动严重,影响其在钢中的作用效果。然而,由于含稀土渣系热力学数据的缺失,限制了相关研究工作的开展。依据分子离子共存理论,建立了CaO-Al2O3-MgO-SiO2-Ce2O3渣系的活度计算模型,并绘制组元的等活度线图,讨论w(CaO)/w(Al2O3)、w(Ce2O3)等成分变化对渣系中各组元活度的影响。计算结果表明,CaO-Al2O3基精炼渣的SiO2活度范围(4×10−19~7×10−18)远小于CaO-SiO2基精炼渣的活度范围(0.003~0.4),即对于稀土钢而言,CaO-Al2O3基精炼渣更为适用;对于CaO-Al2O3基精炼渣,提高熔渣的w(CaO)/w(Al2O3)和w(Ce2O3)可增加Ce2O3活度、减小Al2O3活度,能够减弱含稀土钢液与熔渣中Al2O3间的反应。
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关键词:
- 稀土钢 /
- 精炼渣系 /
- 活度 /
- 分子离子共存理论
Abstract: During smelting steel containing rare earth elements, there exists strong reaction between the molten steel and the slag, which may result in significant content fluctuation of dissolved rare earth and then reduce its effect in steel. However, the lack of thermodynamic data of rare earth-containing slag system limits the development of related research work. In this paper, based on the ion and molecule coexistence theory, an activity calculation model of the CaO-Al2O3-MgO-SiO2-Ce2O3 slag system has been established, which can be used to construct the iso-activity diagram and investigate w(CaO)/w(Al2O3), w(Ce2O3) and other composition changes on the activity of each component of the slag system. The results show that the SiO2 activity range (4×10−19~7×10−18) of CaO-Al2O3-based refining slag is much smaller than that of CaO-SiO2-based refining slag (0.003~0.4), that is, CaO-Al2O3-based slag is more suitable for rare earth steel. For CaO-Al2O3-based refining slag, increasing the w(CaO)/w(Al2O3) and w(Ce2O3) of the slag can increase the activity of Ce2O3 and decrease the activity of Al2O3 , which may restrain the reaction between the rare earth-containing molten steel and Al2O3 in the slag.-
Key words:
- rare earth steel /
- slag system /
- activity /
- ion and molecule coexistence theory
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图 1 Ce与CaO、Al2O3、SiO2反应的标准吉布斯自由能
Figure 1. Standard Gibbs free energy of Ce reaction with CaO, Al2O3 and SiO2
图 2 CaO-Al2O3-SiO2三元相图
Figure 2. CaO-Al2O3-SiO2 ternary phase diagram
图 3 CaO-Al2O3-5%MgO-SiO2-Ce2O3渣系中SiO2等活度图
(a) CaO-Al2O3基;(b) CaO-SiO2基
Figure 3. Iso-activity diagram of SiO2 in CaO-Al2O3-5%MgO-SiO2-Ce2O3 slag system
图 4 CaO-Al2O3-5%MgO-7%SiO2-Ce2O3渣系中Ce2O3等活度图
Figure 4. Iso-activity diagram of Ce2O3 in CaO-Al2O3-5%MgO-7%SiO2-Ce2O3 slag system
图 5 CaO-Al2O3-5%MgO-7%SiO2-Ce2O3渣系Al2O3等活度图
Figure 5. Iso-activity diagram of Al2O3 in CaO-Al2O3-5%MgO-7%SiO2-Ce2O3 slag system
表 1 CaO-Al2O3-MgO-SiO2-Ce2O3结构单元
Table 1. Structural units of CaO-Al2O3-MgO-SiO2-Ce2O3
体系 结构单元 基本结构单元 Ca2+、Ce3+、Mg2+、Al2O3、SiO2 Al2O3-CaO CaO∙Al2O3、3CaO∙Al2O3、CaO∙2Al2O3、CaO∙6Al2O3 Al2O3-Ce2O3 Ce2O3·Al2O3、Ce2O3·11Al2O3 Al2O3-SiO2 3Al2O3·2SiO2 Al2O3-MgO MgO·Al2O3 SiO2-CaO CaO·SiO2、3CaO·2SiO2、2CaO·SiO2、3CaO·SiO2 SiO2-Ce2O3 Ce2O3·SiO2、Ce2O3·2SiO2、Ce4.67Si3O13 SiO2-MgO 2MgO·SiO2、MgO·SiO2 CaO-Al2O3-SiO2 2CaO·Al2O3·SiO2、CaO·Al2O3·2SiO2、CaO·Al2O3·SiO2、3CaO·Al2O3·3SiO2 CaO-SiO2-MgO CaO·MgO·2SiO2、CaO·MgO·SiO2、2CaO·MgO·2SiO2、3CaO·MgO·2SiO2 MgO-Al2O3-SiO2 2MgO·2Al2O3·5SiO2、4MgO·5Al2O3·2SiO2、3MgO·Al2O3·3SiO2 CaO-Al2O3-Ce2O3 2CaO·Al2O3·Ce2O3、2CaO·3Al2O3·Ce2O3 CaO-Al2O3-MgO 3CaO·MgO·2Al2O3、CaO·MgO·7Al2O3、CaO·2MgO·8Al2O3 CaO-Al2O3-SiO2 CaO·3SiO2·2Ce2O3 表 2 CaO·3SiO2·2Ce2O3化合物的热力学数据
Table 2. Thermodynamic data of CaO·3SiO2·2Ce2O3 compounds
化合物 H298/ (kJ·mol−1) S298 /[J.(mol·K)−1] Cp(T)=a+b×10−3T+c×105T−2 [J·(mol·K)−1] a b c CaO·3SiO2·2Ce2O3 −7330.568 466.137 477.948 67.814 −88.2 聚圣源kawaksromstereoscopicplayer宝宝起名网起名免费怎么用奇门遁甲起名字起名网免费取名大全如何起名根据出生上海市杨浦区国顺东路文化佳园公寓小区好看的都市小说教育培训机构起名唐砖男孩子起名中间靖性虎导航盛超演过的电视剧起个小名武汉华天大酒店mm1313不能看了大连起名比较厉害的老师起名为诗词远离赌城百度皇马vs巴萨历史战绩郑州商标起名真正的免费公司起名字蜘蛛侠3英雄无归大陆上映时间男孩起名张景什么天津5在线直播用帆字起名诡异档案海 起名健身房健身器材大全的起名desire漫画淀粉肠小王子日销售额涨超10倍罗斯否认插足凯特王妃婚姻让美丽中国“从细节出发”清明节放假3天调休1天男孩疑遭霸凌 家长讨说法被踢出群国产伟哥去年销售近13亿网友建议重庆地铁不准乘客携带菜筐雅江山火三名扑火人员牺牲系谣言代拍被何赛飞拿着魔杖追着打月嫂回应掌掴婴儿是在赶虫子山西高速一大巴发生事故 已致13死高中生被打伤下体休学 邯郸通报李梦为奥运任务婉拒WNBA邀请19岁小伙救下5人后溺亡 多方发声王树国3次鞠躬告别西交大师生单亲妈妈陷入热恋 14岁儿子报警315晚会后胖东来又人满为患了倪萍分享减重40斤方法王楚钦登顶三项第一今日春分两大学生合买彩票中奖一人不认账张家界的山上“长”满了韩国人?周杰伦一审败诉网易房客欠租失踪 房东直发愁男子持台球杆殴打2名女店员被抓男子被猫抓伤后确诊“猫抓病”“重生之我在北大当嫡校长”槽头肉企业被曝光前生意红火男孩8年未见母亲被告知被遗忘恒大被罚41.75亿到底怎么缴网友洛杉矶偶遇贾玲杨倩无缘巴黎奥运张立群任西安交通大学校长黑马情侣提车了西双版纳热带植物园回应蜉蝣大爆发妈妈回应孩子在校撞护栏坠楼考生莫言也上北大硕士复试名单了韩国首次吊销离岗医生执照奥巴马现身唐宁街 黑色着装引猜测沈阳一轿车冲入人行道致3死2伤阿根廷将发行1万与2万面值的纸币外国人感慨凌晨的中国很安全男子被流浪猫绊倒 投喂者赔24万手机成瘾是影响睡眠质量重要因素春分“立蛋”成功率更高?胖东来员工每周单休无小长假“开封王婆”爆火:促成四五十对专家建议不必谈骨泥色变浙江一高校内汽车冲撞行人 多人受伤许家印被限制高消费
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