A calculation model of activity for CaO–SiO 2 –MgO–Al 2 O 3 –TiO 2 slag is established according to molecular-ion coexistence theory of slag structure to calculate the activities of Al 2 O 3 , SiO 2 , and TiO 2 in the slag. The possibility of TiO 2 reduction in the slag during refining is analyzed by thermodynamics and verified by laboratory and industrial experiments. Both theoretical analysis and laboratory experimental results show that the content of TiO 2 in the ladle slag significantly influences the Ti content in molten steel. When the content of the dissolved aluminum in molten steel is 0.030–0.050%, the TiO 2 content in the ladle slag should be controlled below 0.3% to prevent TiO 2 reduction. The critical content of TiO 2 decreases with an increasing amount of the dissolved aluminum in molten steel. In addition, silicon should be used as a deoxidizer during diffused deoxidization because aluminum as a deoxidizer would lead to the reduction of TiO 2 . The industrial experiments confirm the results of the laboratory experiments and thermodynamics analysis.

中文翻译：

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炉渣中TiO2含量对钢水中Ti含量的影响

根据炉渣结构的分子离子共存理论，建立了CaO-SiO 2 -MgO-Al 2 O 3 -TiO 2炉渣活性计算模型，计算了Al 2 O 3，SiO 2和TiO 2在炉渣中的活性。炉渣。通过热力学分析精炼过程中炉渣中TiO 2还原的可能性，并通过实验室和工业实验进行验证。理论分析和实验室实验结果均表明，钢包渣中TiO 2的含量显着影响钢水中的Ti含量。当钢水中溶解铝的含量为0.030-0.050％时，钢包渣中的TiO 2含量应控制在0.3％以下，以防止TiO 2还原。TiO 2的临界含量随着钢水中溶解铝含量的增加而降低。此外，在扩散脱氧过程中，应将硅用作脱氧剂，因为铝作为脱氧剂会导致TiO 2的还原。工业实验证实了实验室实验和热力学分析的结果。