废弃SCR脱硝催化剂与废NaCl盐焙烧回收催化剂中的钛、钒、钨

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

通过废弃选择性催化还原(SCR)脱硝催化剂与废NaCl盐焙烧,可以将催化剂中的钨和钒与钛分离。在最佳浸出条件下(焙烧温度900℃,焙烧时间3 h,废盐与废催化剂的质量比为0.5,浸出温度80℃,反应时间60 min),钨和钒的浸出率分别达到84.63%和66.42%,同时钛的损失率仅为1.3%。废NaCl盐和焙烧温度可以促进锐钛矿型TiO_(2)转化为金红石型TiO_(2),反应后得到了金红石型TiO_(2)。金红石型TiO_(2)中的钛的价态为四价,晶格氧和化学吸附氧分别占57.26%和42.74%。该方法可以同时解决2种废弃物的处置问题。

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 ℃;roasting time 3 h;mass ratio of WNCS to waste SCR catalysts 0.5;reaction temperature 80 ℃;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 TiO_(2)to rutile TiO_(2). And the rutile TiO_(2)is obtained. The valence of rutile TiO_(2)is quadrivalent, and the lattice oxygen and chemisorbed oxygen occupy 57.26% and 42.74%, respectively.