摘要
目前应用最为广泛的烟气脱硝技术是SCR脱硝技术。SCR催化剂是脱硝系统中的核心部分,其具有一定的寿命。废弃催化剂在未来几年内将急剧增多,其处置方法少有报道。本文主要研究了SCR废弃催化剂中钛、钒、钼的湿法回收技术。使用Na2CO3与SCR催化剂于750℃共混煅烧,用热水洗涤得到Na2Ti O3,酸洗煅烧得到Ti O2。向滤液中加HCl调节p H值到8-9得到Mg Si O3沉淀,再加入NH4Cl得到NH4VO3沉淀。将沉钒滤液调节p H值为4-5,加入Ca Cl2得到Ca Mo O4沉淀。借助XRD、XRF等分析手段对回收产品进行了表征,优化了回收工艺,最终得到了纯度高达93%的Ti O2产品。
Selective catalytic reduction（SCR） was the necessary technology for power plant denitrification. SCR catalyst was the core technical section,whose service life is about 3 years. It can be predicted that the deactivated catalyst faced a disposal problem because of the rapid increase in next several years. This article explored the recovery of titanium oxides from SCR de NOx process from the perspective of recovery utilization. TiO2 was obtained after the pickling and calcination of Na2TiO3,which was from the co-calcination of Na2CO3,and catalysts were deactivated at 750℃. Mg SiO3,NH4VO3 and CaMoO4 were obtained by adjusting pH from 8 to 9,adding NH4Cl and adding Ca Cl2,respectively. Recovery products were characterized by X-ray diffraction（XRD） and X-ray fluorescence（XRF）. At optimized condition,the purity of the obtained product was higher than 93%.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2015年第7期2039-2042,2048,共5页
Chemical Industry and Engineering Progress
基金
高等学校博士学科点专项科研基金(20113219110009)
国家自然科学基金(U1162119)
江苏省科技支撑计划(BK20140777)
江苏省自然科学基金(2013003)项目
关键词
浸取
催化剂
回收
废物处理
leaching
catalyst
recovery
waste treatment
作者简介
赵炜（1980-），女，博士研究生，讲师。
联系人：钟秦，博士，教授。E-mail：zq304@mail．njust．edu．cn。
