Reduction behavior and crystal structures of oxidized high titanium slag containing sodium salt.

The high titanium slag obtained by the novel process of semi-molten reduction with sodium salt and magnetic separation technology needs to be modified–leached to obtain high-quality upgraded titanium raw materials suitable for the chlorination process. The reduction behavior and crystal structure of oxidized high titanium slag containing sodium salt in the modification process were investigated. The sodium-titanium-iron oxide in the oxidized high titanium slag was found to be a complex solid solution formed by doping Fe³⁺, Mg²⁺, and Mn³⁺ in the Ti ion occupancy sites. During the initial stages of reduction, a portion of the Fe ion and Ti ion in the sodium-titanium-iron oxide were reduced to form Fe and FeTiO₃ phases. However, when the temperature exceeded 850 °C, the oxidizing TiO₂ would oxidize the partially reduced iron and incorporate it into the crystal structure of sodium-titanium-iron oxide, which was not conducive to subsequent leaching of the sample. The reduction process was primarily divided into two stages, controlled by chemical reaction and gas diffusion, respectively. The apparent activation energies were found to be 37.95 kJ/mol and 70.09 kJ/mol, respectively. [ABSTRACT FROM AUTHOR]