Effect of the concentration NaOH solution on the ability to synthesize TiO2 from titanium slag

다국어 초록 (Multilingual Abstract)

Titanium slag is a waste product from the Ilmanite ore beneficiation process. In this study, titanium slag was used tosynthesize TiO2 by hydrothermal method at different NaOH concentrations. Titanium slag was mixed with NaOH solutionwith different concentrations and hydrothermally treated under 1MPa pressure at 180 oC for 7 hours. The alkalization abilityof TiO2 slag by NaOH solution under hydrothermal conditions was evaluated by X-ray diffraction analysis. The hydrothermalsolution is hydrolyzed at 90 oC and calcined at 400 oC to form TiO2. After precipitation and calcination, the TiO2 powderwas evaluated for phase composition and microstructure using X-ray diffraction analysis and Scanning electron microscopy/Energy Dispersive X-ray. The results show that the TiO2 separation rate is high when the NaOH concentration reachesover 10 M. A NaOH concentration of 10 M is suitable to separate TiO2 from titanium slag. At this concentration, a largeamount of TiO2 was separated, and the solution had little impurities. The low amount of impurities would help TiO2 to beobtained after calcination with high purity, improving the applicability of this material. The TiO2 obtained after calcinationhas the main polymorphy form anatase. The anatase polymorphy can help the formed TiO2 photocatalytic materials withantibacterial properties.