Crystallization and Coarsening Kinetics of Rutile Phase in Modified Ti-Bearing Blast Furnace Slag

Abstract

Crystallization and coarsening kinetics of nonisothermal precipitation process of rutile in modified Ti-bearing blast furnace slag were discussed. The modified slag was analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM) and EDX. The experimental results showed that the cooling rate has an important effect on precipitation of the rutile phase. Low cooling rate is in favor of the increase in the volume fraction of rutile phase in Ti-bearing blast furnace slag and the growth of rutile phase. The volume fraction of rutile phase was approximately described by JMAK equation. The experiential expression of average crystal radius for rutile phase was also obtained.

Phase Equilibrium Study of the CaO-SiO2-MgO-Al2O3-TiO2 System at 1300°C and 1400°C in Air

“…The initial compositions of the samples were designed based on industrial compositions of Tibearing slags. 17,33,34 The 0.15-g mixture samples were prepared by accurately mixing (± 0. wt.%), and TiO 2 (99.8 wt.%) from the suppliers Sigma-Aldrich or Alfa Aesar. The blend was thoroughly mixed, and then pressed into small cylinders and stored in a desiccator prior to use.…”

Phase equilibria of the CaO–SiO2–TiO2–Al2O3–MgO system in air at 1250–1400 °C

“…Titania-bearing slag is a typical industrial byproduct of the blast furnace smelting of vanadium and titanium magnetites [1], where the TiO 2 content is approximately 22-25 wt% [2][3][4] and indicates a good source of titania. With a greater demand for a circular economy, various techniques, such as selective crystallization of TiO 2 -rich crystals followed by phase separation (SCPS), hydrometallurgical acid leaching, and the melting reduction method [5][6][7][8][9][10][11][12], have been developed so far for effective recovery of the titania values from titania-bearing slags. Of these, the SCPS method was suggested to have the most industrial potential for slag processing [13].…”