废弃脱硝催化剂碱浸提取钒和钨的浸出动力学研究  

Study on leaching kinetics of extracting vanadium and tungsten by sodium hydroxide from spent SCR catalyst

作　　者：唐丁玲[1] 宋浩[1] 刘丁丁[1] 吴卫红[1] 郑成航[1] 高翔[1] TANG Dingling SONG Hao LIU Dingding WU Weihong ZHENG Chenghang GAO Xiang(State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《环境工程学报》2017年第2期1093-1100,共8页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2016YFC0203701);国家自然科学基金两化融合联合基金资助项目(U1609212);江苏省科技成果转化专项(BA2014127);浙江省科技计划项目(2016F50026)

摘　　要：针对不同NaOH浓度和浸出温度进行碱浸提取废弃脱硝催化剂中钒、钨的实验研究。在NaOH浓度为7.5 mol·L^(-1),碱浸温度为100℃的条件下,V_2O_5和WO_3的碱浸效率分别可达到92.94%和97.30%。基于液-固浸出过程中的核收缩模型研究了碱浸过程中钒、钨的浸出动力学,考察了NaOH浓度、碱浸温度对V_2O_5、WO_3浸出反应速率的影响,进而确定浸出过程中的控制步骤。结果显示,在100℃温度下,NaOH浓度在0.5~7.5 mol·L^(-1)范围内,V_2O_5、WO_3的浸出过程为固膜扩散控制过程,其表观反应级数分别为0.305、0.436。在7.5 mol·L^(-1)NaOH浓度下,V_2O_5、WO_3的浸出过程在30~100℃的反应温度范围内均为固膜扩散控制过程,浸出反应的表观活化能分别为17.74和37.88 k J·mol-1。Experiments were conducted with different concentrations of sodium hydroxide and leaching temperatures. The results show that under the optimal conditions（ 7. 5 mol·L^-1NaOH,373 K）,the alkali leaching efficiency of V_2O_5 and WO_3can reach 92. 94% and 97. 30%,respectively. The effects of the sodium hydroxide concentration and temperature on the leaching rate were investigated based on the shrinking core model. Diffusion through the catalyst was found to be the rate-controlling process during the reaction. The apparent reaction orders of V_2O_5 and WO_3are 0. 305 and 0. 436,respectively,in the concentration range of 0. 5—7. 5 mol·L^-1.The activation energies for V_2O_5 and WO_3were determined to be approximately 17. 74 k J·moL^-1and 37. 88 k J·moL^-1,respectively,in the temperature range of 303—373 K.

关 键 词：废弃脱硝催化剂 碱浸 浸出动力学 钒 钨 

分 类 号：X773[环境科学与工程—环境工程]