凝聚电子相与Wagner模型在低钛渣下 钛的分配行为中的应用.pdfVIP

凝聚电子相与Wagner模型在低钛渣下 钛的分配行为中的应用.pdf

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凝聚电子相与Wagner模型在低钛渣下 钛的分配行为中的应用.pdf

Trans. Nonferrous Met. Soc. China 25(2015) 1640−1647 Congregated electron phase and Wagner model applied in titanium distribution behavior in low-titanium slag Zhen-yang WANG, Jian-liang ZHANG, Xiang-dong XING, Zheng-jian LIU School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China Received 28 April 2014; accepted 30 January 2015 Abstract: For studying the carbon thermal reduction rules of titanium in hot metal and providing a theoretical basis for the blast furnace (BF) hearth protection, the distribution behavior of titanium between low-titanium slag system of CaO−SiO2− MgO−Al O −TiO and hot metal was studied using analytical reagents in a temperature range from 1350 °C to 1600 °C. Through 2 3 2 high temperature melting, rapid quenching, chemical analysis and thermodynamic model calculating, the results showed that the increase of reaction temperature, which improved the titanium distribution L(Ti) and lowered the system activity coefficient γsys, leads to the rise of equilibrium constant. Combined with Wagner and congregated electron phase models, the data obtained in distribution experiments were used to fit out the Gibbs free energy formula of titanium carbothermic reduction. Finally, the relations between the contents of Si and Ti in hot metal and the titanium load to reach the minimum w(Ti) for the formation of TiC were given. Key words: titanium; distribution behavior; activity coefficient model; hearth protection; titanium load

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