Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (07): 2039-2042,2048.DOI: 10.16085/j.issn.1000-6613.2015.07.038

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Recovery of waste SCR catalyst from titanium, vanadium and molybdenum by wet method

ZHAO Wei1, YU Aihua2, WANG Hu2, JIANG Xiaoming2, DING Jie1, DONG Yue1, ZHONG Qin1   

  1. 1 School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China;
    2 Datang Nanjing Environmental Protection Technology Co., Ltd., Nanjing 211106, Jiangsu, China
  • Received:2014-10-09 Revised:2015-02-25 Online:2015-07-05 Published:2015-07-05

湿法工艺回收板式SCR废弃催化剂中的钛、钒、钼

赵炜1, 于爱华2, 王虎2, 江晓明2, 丁杰1, 董岳1, 钟秦1   

  1. 1 南京理工大学化工学院, 江苏 南京 210094;
    2 大唐南京环保科技有限责任公司, 江苏 南京 211106
  • 通讯作者: 钟秦,博士,教授。E-mail:zq304@mail.njust.edu.cn。
  • 作者简介:赵炜(1980—),女,博士研究生,讲师。
  • 基金资助:
    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)及江苏省自然科学基金(2013003)项目。

Abstract: 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 deNOx 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℃. MgSiO3, NH4VO3 and CaMoO4 were obtained by adjusting pH from 8 to 9, adding NH4Cl and adding CaCl2, 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%.

Key words: leaching, catalyst, recovery, waste treatment

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Na2TiO3, 酸洗煅烧得到TiO2。向滤液中加HCl调节pH值到8~9得到MgSiO3沉淀, 再加入NH4Cl得到NH4VO3沉淀。将沉钒滤液调节pH值为4~5, 加入CaCl2得到CaMoO4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TiO2产品。

关键词: 浸取, 催化剂, 回收, 废物处理

CLC Number: 

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