Jump to main content
Jump to site search


Effect of basicity on the crystallization behavior of TiO2-CaO-SiO2 ternary system slag

Abstract

The titanium-bearing blast furnace slag contains much amount of unemployed titanium and thus causes both resource waste and environmental pollution. The enrichment and extraction of titanium from titanium-bearing blast furnace slag is an urgent problem to be solved. In the present work, the crystallization behavior of TiO2-CaO-SiO2 ternary system slag was investigated both theoretically and experimentally in the binary basicity (CaO/SiO2 mass ratio) range from 1.0 to 1.4. Thermodynamic calculation indicated that perovskite (CaTiO3) and sphene (CaTiSiO5) were the two main titanium-containing phases and perovskite was the first precipitated phase during the cooling process. With the increase of basicity, the mass percentage of both perovskite and wollastonite (CaSiO3) increased while that of sphene decreased. The experimental results showed a good agreement with the thermodynamic calculation. Also, it was found that the crystals appeared as hexagonal, leaf vein and dendrite shape in macroscopically, and the size reached the centimeter level. Observation of the three-dimensional topography suggested the perovskite phase existed as dendrite with the orthorhombic crystal, and the sphene grew by taking the perovskite crystal as their nucleus and then wrapping the perovskite crystals.

Back to tab navigation

Publication details

The article was received on 01 Jul 2018, accepted on 06 Aug 2018 and first published on 06 Aug 2018


Article type: Paper
DOI: 10.1039/C8CE01078A
Citation: CrystEngComm, 2018, Accepted Manuscript
  •   Request permissions

    Effect of basicity on the crystallization behavior of TiO2-CaO-SiO2 ternary system slag

    G. Fan, J. Dang, X. Lv and M. Hu, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01078A

Search articles by author

Spotlight

Advertisements