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| Thermodynamic analysis of Ti(C,N) formation conditions in blast furnace hearth |
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Received:February 27, 2021
Revised:March 06, 2021
Accepted:March 08, 2021
Published Online:August 18, 2021
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| DOI： |
| KeyWord:blast furnace operation; titanium carbonitride; thermodynamic model; phase equilibrium |
| Author | Institution |
| Liuzhennan |
Kunming Metallurgy College;Faculty of metallurgy and mining |
| yaochunling |
Kunming Metallurgy College;Faculty of metallurgy and mining |
| Houjinhai |
Kunming Metallurgy College;Faculty of metallurgy and mining |
| Zihaotao |
Kunming Metallurgy College;Faculty of metallurgy and mining |
| Chenhaonan |
Kunming Metallurgy College;Faculty of metallurgy and mining |
| Wangyalei |
Kunming Metallurgy College;Faculty of metallurgy and mining |
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| Abstract: |
| In order to understand the formation rule and distribution trend of Ti(C,N) with the change of physicochemical conditions in the smelting of ilmenite in blast furnace, and then considering the fact that titanium carbonitride is a non-ideal solid solution, the solubility of Ti in carbon saturated Fe-C-Ti melt was calculated by Wagner formula and modified MIVM (M-MIVM), and the critical conditions and influencing factors for the formation of Ti(C,N) from Al2O3-CaO-SiO2-TiO2 slag were studied. The results show that the solubility of Ti in carbon saturated Fe-C-Ti melt and the equilibrium content of TiO2 which forms Ti(C,N) solid solution from slag are in good agreement with the experimental data, and the calculation results are better than the previous research. In the process of blast furnace smelting, the formation of carbonitrides can be inhibited by appropriately reducing the temperature of hearth area, increasing the basicity of slag, reducing the content of Al2O3 in slag, increasing the total pressure of furnace gas and reducing the partial pressure of nitrogen. The results show that the method is reasonable and feasible. This study can provide some reference for the basic theoretical research of titanium bearing material smelting in blast furnace. |
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