The equilibrium partitioning of titanium between Ti3+ and Ti4+ valency states in CaO-SiO2-TiOx slags
The equilibrium partitioning of titanium between Ti3+ and Ti4+ valency states in CaO-SiO2-TiOx slags
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DOI：
10.1007/s11663-002-0086-2
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发表时间：
2002-02
期刊：
影响因子：
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通讯作者：
G. Tranell;O. Ostrovski;S. Jahanshahi
中科院分区：
文献类型：
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作者：
G. Tranell;O. Ostrovski;S. Jahanshahi
用渣气平衡法研究了钛在CaO-SiO_2-TiO_x熔体中的氧化还原行为。钛在Ti 3+和Ti4+价态之间的分配以及TiO1.5和TiO 2的活度系数之比被确定为氧分压、温度和炉渣成分的函数。平衡实验在1783 ~ 1903 K温度范围内，CO-CO2-Ar气氛中进行，氧分压范围为10− 12 ~ 10−7atm（1.01×10− 10 kPa ~ 1.01×10− 5 kPa）。炉渣的CaO/SiO2比在0.55和1.35之间，总的氧化钛浓度为7至50质量%。实验结果表明，在CaO-SiO2-TiOx渣系中，Ti 3 +/Ti4+比值随氧分压的降低而增大，随CaO/SiO2比值的增大和温度的降低而减小。测量的氧化还原比Ti 3 +/Ti 4+与氧分压的变化密切遵循理想的行为。CaO/SiO2比的增加使TiO1.5和TiO 2的活度系数之比增大。总二氧化钛含量对这个比例的影响更为复杂，并雅阁拉曼光谱数据。
The redox behavior of titanium in CaO-SiO2-TiOxmelts was investigated using a slag-gas equilibrium technique. Titanium partitioning between Ti3+and Ti4+valency states and the ratio of activity coefficients of TiO1.5and TiO2were determined as functions of oxygen partial pressure, temperature, and slag composition. The equilibrium experiments were carried out at temperatures between 1783 and 1903 K under CO-CO2-Ar gas atmosphere with oxygen partial pressure ranging from 10−12to 10−7atm (1.01×10−10kPa to 1.01×10−5kPa). The slags had CaO/SiO2ratios between 0.55 and 1.35 and total titanium oxide concentrations from 7 to 50 mass pct. Experimental results showed that the Ti3+/Ti4+ratio in CaO-SiO2-TiOxslags, containing up to 50 mass pct TiOx, increased with decreasing oxygen partial pressure and decreased with increasing CaO/SiO2ratio and decreasing temperature. Measured variation of the redox ratio Ti3+/Ti4+with oxygen partial pressure closely followed the ideal behavior. Increasing the CaO/SiO2ratio increased the ratio of activity coefficients of TiO1.5and TiO2. The effect of total titania content on this ratio was more complex and in accord with Raman spectroscopy data.