Vanadium Slag Calcium Roasting Process Enhanced by Borocalcite

Converter vanadium slag contains TiO₂,Al₂O₃ and silicate.It leads to the formation of coating layer outside the vanadium-iron spinel phase during the roasting process,which has adverse effects on the oxidization of low valence vanadium and decreases the leaching rate of clinker.In order to improve the roasting performances of the vanadium slag,borocalcite was used as additive in the roasting process.It shows that the borocalcite can effectively destroy the silicate coating layer outside the spinel phase and intensifies the phase transformation during the roasting process.