Synthesis and non-isothermal carbothermic reduction of FeTiO3-Fe2O3 solid solution systems

Abstract:

To exam the carbothermic reduction behaviors of the (1-x)FeTiO₃?xFe₂O₃ solid solutions with various x value, the solid solutions were artificially synthesized successfully and then subjected to non-isothermal carbothermic reduction. The results show that the solid solutions synthesized in laboratory were uniform texture and high purity. Meanwhile, lattice distortion degree of FeTiO₃ was greater with increasing the value of x, and the initial reduction temperature and reduction rate which is the increasing rate of reduction degree α were also improved. The reduction could be improved for FeTiO₃ as Fe₂O₃ dissolving, and the Fe₂TiO₄ as well as Fe₃Ti₃O₁₀ were existed as the transition phase in the reduction process. FeO, Fe₂TiO₄ and TiO₂ were firstly generated in the interface of solid - graphite, and then reduced to Fe and Ti₂O₃. It is concluded that the apparent activation energy of 295.54 kJ/mol from the calculation and analysis of the non-isothermal kinetics for the carbon thermal reduction process.

Key words:titanium-iron solid solution; phase transformation; non-isothermal reaction