TiO2和TiN夹杂物在CaO–SiO2–B2O3基无氟保护渣中的溶解行为

蔡大为; 张力; 王万林; 张磊; Il Sohn

doi:10.1007/s12613-023-2622-9

Volume 30 Issue 9

Sep. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(9): 1740-1747

Dawei Cai, Li Zhang, Wanlin Wang, Lei Zhang, and Il Sohn, Dissolution of TiO₂ and TiN inclusions in CaO–SiO₂–B₂O₃-based fluorine-free mold flux, Int. J. Miner. Metall. Mater., 30(2023), No. 9, pp. 1740-1747. https://doi.org/10.1007/s12613-023-2622-9

Cite this article as:

Dawei Cai, Li Zhang, Wanlin Wang, Lei Zhang, and Il Sohn, Dissolution of TiO2 and TiN inclusions in CaO–SiO2–B2O3-based fluorine-free mold flux, Int. J. Miner. Metall. Mater., 30(2023), No. 9, pp. 1740-1747. https://doi.org/10.1007/s12613-023-2622-9

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研究论文

TiO₂和TiN夹杂物在CaO–SiO₂–B₂O₃基无氟保护渣中的溶解行为

1)
中南大学冶金与环境学院, 长沙 410083, 中国
2)
中南大学清洁冶金国际联合研究中心, 长沙 410083, 中国
3)
Materials Science and Engineering Department, Yonsei University, Seoul 120-749, Rep. of Korea

* 共同第一作者

通讯作者:
张磊 E-mail: truth.zhang009@gmail.com

文章亮点

(1) 在线原位研究了含钛夹杂物在高温熔渣中的动态溶解过程。

(2) 从夹杂物溶解过程微观结构转变的角度剖析了含钛夹杂物的溶解机理。

(3) 对比分析了TiO₂和TiN两种典型含钛钢夹杂物溶解行为和机理的差异。

中文摘要

保护渣作为钢铁连铸的冶金辅料，发挥着吸收夹杂物等重要冶金功能，直接影响了连铸的顺利进行和铸坯的质量。本文利用原位的单丝热电偶技术和X射线光电子能谱技术研究了TiO₂和TiN夹杂物在熔融CaO–SiO₂–B₂O₃基无氟保护渣中的溶解行为和机理。研究结果表明TiO₂夹杂物能够在76 s内有效地被熔渣溶解；在这过程中，TiO₂夹杂物中的[TiO₆]^8-八面体结构会被破坏、并转化成[TiO₄]^4-四面体结构。然而TiN夹杂物的溶解效率远远低于TiO₂的溶解效率。这是因为TiN颗粒需要先被氧化才能被缓慢溶解到熔渣中、转化成[TiO₆]^8-八面体和[TiO₄]^4-四面体结构，并且这反应伴随着大量的氮气生成。另外，在熔体中含有充足的[TiO₆]^8-八面体和Ca²⁺的情况下，高熔点的CaTiO₃晶体容易在氮气气泡表面形核、生长，导致熔渣最终成固液混熔的状态。

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Research Article

Dissolution of TiO₂ and TiN inclusions in CaO–SiO₂–B₂O₃-based fluorine-free mold flux

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Abstract

Abstract

Mold flux serves the crucial metallurgical function of absorbing inclusions, directly impacting the smoothness of the casting process as well as the cast slab quality. In this study, the dissolution behavior and mechanism of TiO₂ and TiN inclusions in molten CaO–SiO₂–B₂O₃-based fluorine-free mold flux were explored by in situ single hot thermocouple technology combined with X-ray photoelectron spectroscopy. The results showed that TiO₂ inclusions are effectively dissolved by the molten slag within 76 s, during which the original octahedral [TiO₆]⁸⁻ structures are destroyed and convert to the networker tetrahedral [TiO₄]⁴⁻ structures. However, the dissolution rate is much lower for TiN inclusions than for TiO₂ inclusions. This can be attributed to the fact that the TiN particles need to be oxidized and then dissolved in the molten slag to form tetrahedral [TiO₄]⁴⁻ and octahedral [TiO₆]⁸⁻ structures during the TiN inclusion dissolution process, which is accompanied by the generation of a large amount of N₂ gas. Moreover, CaTiO₃ crystals tend to nucleate and grow on bubble surfaces with sufficient octahedral [TiO₆]⁸⁻ structures and Ca²⁺ ions, eventually resulting in the molten slag being in a solid–liquid mixed state.
- TiO₂ inclusion;
- TiN inclusion;
- mold flux;
- fluorine-free;
- continuous casting

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