CaO-SiO2-FeO-Al2O3-Na2O-TiO2-P2O5渣系的脱磷热力学模型

孙嘉丽; 刘承军; 姜茂发

doi:10.7513/j.issn.1004-7638.2021.02.024

CaO-SiO₂-FeO-Al₂O₃-Na₂O-TiO₂-P₂O₅渣系的脱磷热力学模型

doi: 10.7513/j.issn.1004-7638.2021.02.024

多金属共生矿生态化冶金教育部重点实验室，东北大学冶金学院，辽宁沈阳 110819

基金项目: 国家重点研发计划(2017YFC0805100)；国家自然科学基金(51874082)；国家自然科学基金辽宁联合基金(U1908224)

详细信息

作者简介:
孙嘉丽(1994—)，女，博士生，主要从事铁水精炼的理论和工艺研究工作，E-mail：sunjl16@163.com

通讯作者:
刘承军(1974—)，男，博士，教授，E-mail: liucj@smm.neu.edu.cn

中图分类号: TF713.3，X756
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- 文章访问数: 249
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-22
- 刊出日期: 2021-04-10

Thermodynamic model for dephosphorization of CaO-SiO₂-FeO-Al₂O₃-Na₂O-TiO₂-P₂O₅ slag

Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China

摘要

摘要: 基于分子离子共存理论(IMCT)建立了CaO-SiO₂-FeO-Al₂O₃-Na₂O-TiO₂-P₂O₅渣系的磷分配比预测模型，并讨论了组分变化对磷分配比的影响以及各碱性组元对磷分配比的贡献。结果表明，该模型计算的磷分配比与实测值吻合度较好；随着w(CaO)增加，磷分配比先增加后趋于平缓，其中30%是较合适的CaO含量；随着w(Na₂O)增加，磷分配比逐渐增加，且Na₂O比CaO脱磷作用更强；随着w(FeO)增加，磷分配比总体呈上升趋势；随着w(Al₂O₃)、w(SiO₂)和w(TiO₂)的增加，磷分配比均呈下降趋势，且相较于Al₂O₃，SiO₂对渣系脱磷能力的不利影响更明显；熔渣中碱性组元CaO和Na₂O对渣系的脱磷能力贡献最大。
- 赤泥 /
- 脱磷渣 /
- 分子离子共存理论 /
- 热力学模型 /
- 活度 /
- 磷分配比
Abstract: A prediction model for phosphorus distribution ratio of the CaO-SiO₂-FeO-Al₂O₃-Na₂O-TiO₂-P₂O₅ slag system was established based on the ion and molecule coexistence theory(IMCT). The influence of component changes on the phosphorus distribution ratio and the contributions of basic components to the phosphorus distribution ratio had been analyzed. The results indicate that the calculated phosphorus distribution ratio of model agrees well with the experimental phosphorus distribution ratio. The phosphorus distribution ratio first increases and then tends to be gentle with the increase of w(CaO), and the appropriate content of CaO is 30%. The phosphorus distribution ratio increases gradually with the increase of w(Na₂O), and Na₂O has stronger dephosphorization ability than CaO. The phosphorus distribution ratio increases with the increase of w(FeO), but decreases gradually with the increase of w(Al₂O₃), w(SiO₂) and w(TiO₂), and SiO₂ is more unfavorable to the dephosphorization ability of slag than Al₂O₃. The dephosphorization capacity of molten slag is mainly attributed to CaO and Na₂O.
- red mud /
- phosphorus slag /
- ion and molecule coexistence theory /
- thermodynamic model /
- activity /
- phosphorus distribution ratio

HTML全文

图 1 磷分配比计算值和实测值的比较

Figure 1. Comparison between calculated and measured phosphorus distribution ratio

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图 2 w(CaO)对L_P的影响

Figure 2. Effect of CaO content on L_P

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图 3 w(Na₂O)对L_P的影响

Figure 3. Effect of Na₂O content on L_P

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图 4 w(FeO)对L_P的影响

Figure 4. Effect of FeO content on L_P

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图 5 w(Al₂O₃)对L_P的影响

Figure 5. Effect of Al₂O₃ content on L_P

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图 6 w(SiO₂)对L_P的影响

Figure 6. Effect of SiO₂ content on L_P

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图 7 w(TiO₂)对L_P的影响

Figure 7. Effect of TiO₂ content on L_P

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图 8 渣中碱性组元和P₂O₅对L_P的贡献

Figure 8. Contributions of basic components and P₂O₅ in the slag to L_P

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