LI Xin, YU Honghao, ZHANG Houfang, et al. Preparation of nano TiO2 from Ti-bearing blast furnace slag by molten salt method[J]. CIESC Journal, 2015, (2): 827-833. DOI: 10.11949/j.issn.0438-1157.20141029.
LI Xin, YU Honghao, ZHANG Houfang, et al. Preparation of nano TiO2 from Ti-bearing blast furnace slag by molten salt method[J]. CIESC Journal, 2015, (2): 827-833. DOI: 10.11949/j.issn.0438-1157.20141029.DOI:
A novel process was proposed for preparing titanium dioxide by decomposition of titanium-bearing blast furnace slag (TBBFS) in molten NaOH-NaF system. Thermodynamic analysis was conducted on the molten salt decomposition of TBBFS. The effects of mass ratio of alkali and slag
reaction time and reaction temperature on titanium extraction and the effects of pH and hydrolysis temperature on purity of titanium dioxide were discussed. The reaction of sodium titanate from TBBFS with sodium hydroxide was feasible thermodynamically. When optimum mass ratio of alkali and slag was 3:1
reaction temperature was 500℃
and reaction time was 3 h
titanium extraction was 99.8%. Optimum pH and hydrolysis temperature were 0.1—0.2 and 100℃ respectively. Analysis results indicated good sphericity and dispersibility of TiO2 particles with diameter about 100 nm.