废SCR催化剂钠化焙烧回收钨和钒的机理探究

文章从热力学角度，分别以温度和碳酸钠加入量为变量，用热力学软件HSC Chemistry计算了蜂窝状废SCR催化剂钠化焙烧的过程，得到了相应的相图，并分析了其对钨和钒浸出率的影响。研究了不同动力学条件下钨和钒的浸出率，得到最佳焙烧条件为：碳酸钠加入量为30%、焙烧温度为800 ℃、粒度为75～100 μm、焙烧时间为2～2.5 h。采用XRD和SEM进行物相和形貌分析。从理论和实验上探究了失效SCR催化剂钠化焙烧过程的机理。

Study on mechanism of recovery of tungsten and vanadium from waste SCR catalysts by soda roasting

The article is about thermodynamic calculations of waste honeycomb SCR catalysts in sodium roasting process un- der different conditions.Temperature and sodium carbonate addition were variable during the process，and the corresponding phase diagrams were made by thermodynamic software HSC Chemistry while their effect on leaching rate of tungsten and vanadium was analyzed.The leaching rates of tungsten and vanadium under different roasting conditions were studied.The opti- mum conditions were obtained：the addition amount of sodium carbonate was 30%，the roasting temperature was 800 ℃，the grain size was at 75～100 μm，and the roasting time was at 2～2.5 h.The phase and morphology of raw catalysts and roasted samples were analyzed by XRD and SEM.The mechanism of recovery of tungsten and vanadium from waste SCR catalysts in soda roasting process was studied from the point of theory analysis and experiment.