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| Influence of TiO2 on properties of Jingtang blast furnace slag and thermodynamic analysis |
| XU Ren-ze1，ZHANG Jian-liang1，ZHANG He-shun2，LIU Chang-jiang2， FAN Xiao-yue1，WANG Zhi-yu1 |
（1. School of Metallurgical and Ecological Engineering， University of Science and Technology Beijing， Beijing 100083，China
2. Ironmaking Department， Shougang Jingtang United Iron and Steel Co.， Ltd.，Tangshan 063200， Hebei， China） |
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Abstract In order to clarify the impact mechanism of TiO2 on the performance of Jingtang blast furnace slag， based on the actual composition of Jingtang blast furnace slag， the influences of TiO2 on viscosity and melting temperature of slags were investigated through viscosity test. Furthermore， the activity， liquidus temperature， liquid region and phase change of slag from 1 500 to 1 000 ℃ were calculated by using FactSage thermodynamic software. The viscosity experimental result indicates that the viscosity and melting temperature of slag decrease with the increase of mass percent of TiO2.The calculation results from FactSage show that the viscosity decreases with the increase of TiO2 activity； the increase of mass percent of TiO2 could reduce the liquidus temperature and expand the liquid region in MgO and Al2O3 region， however the slag liquid region in CaO region isreduced when TiO2 changes from 4.2% to 5.6%. The transformation of the crystalline phase indicatesthat the perovskite is easy to generate at high temperature when TiO2 is too much， which can increase the viscosity of the slag and it is not conducive to the blast furnace operation. In order to ensure the fluidity of Jingtang slag and meet the requirement of furnace maintenance， the mass percent of TiO2 in slag should be controlled within 5%.
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Received: 30 November 2016
Published: 07 September 2017
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2017, Vol. 52 
