Recovery of Titanium, Vanadium and Tungsten from Waste SCR Catalysts by Roasting with Waste NaCl Salts

Abstract:

Tungsten and vanadium was separated from Ti in waste selective catalytic reduction (SCR) catalyst by roasting with waste NaCl salts (WNCS). Results show that the leaching efficiency of tungsten and vanadium reaches 84.63% and 66.42%, respectively, under the optimal conditions (roasting temperature 900 °C; roasting time 3 h; mass ratio of WNCS to waste SCR catalysts 0.5; reaction temperature 80 °C; reaction time 60 min), and the loss rate of titanium is 1.3%. The waste NaCl salts and roasting temperature play a positive role in converting anatase TiO₂ to rutile TiO₂. And the rutile TiO₂ is obtained. The valence of rutile TiO₂ is quadrivalent, and the lattice oxygen and chemisorbed oxygen occupy 57.26% and 42.74%, respectively.