The Activity Model and Thermodynamic Analysis for Ti-Bearing Blast Furnace Slag

doi:10.12068/j.issn.1005-3026.2015.01.010

Abstract

Abstract: Based on the coexistence theory of molecules and ions in slags， an activity model of CaO-SiO₂-MgO-Al₂O₃-TiO₂ was constructed， and the calculated result was in good agreement with experimental data. Combined with the phase diagram， the activity model was used to calculate the influences of slag basicity and w(TiO₂) on the activities of the main components in slag. The calculated result indicates that the component containing TiO₂ is mainly CaO·TiO₂， and the activity of CaO·TiO₂ is 0.18 at 1500°C. The activity of CaO·TiO₂ increases first and then decreases with the increase of w(TiO₂) and basicity. It is better for the increase of activity of CaO·TiO₂ when the basicity is between 1.08 and 3.08 and w(TiO₂) is between 26% and 43%， which is benefit for the enrichment of titania as CaO·TiO₂.The corresponding basicity for maximum activity of CaO·TiO₂ increases with the increase of w(TiO₂)， and the basicity is between 1.34 and 1.63 when w(TiO₂) is between 20% and 28%， while the maximum enrichment of titania as CaO·TiO₂ can be obtained.

Key words: activity model, the coexistence theory of molecule and ion, thermodynamics, Ti-bearing blast furnace slags, comprehensive utilization

CLC Number:

TF61

SHI Jun-jie， LI Jie， SUN Li-feng， JIANG Mao-fa. The Activity Model and Thermodynamic Analysis for Ti-Bearing Blast Furnace Slag[J]. Journal of Northeastern University Natural Science, 2015, 36(1): 43-47.

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