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

doi:10.16085/j.issn.1000-6613.2015.07.038

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 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 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

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 deNO_x 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:

X705

ZHAO Wei, YU Aihua, WANG Hu, JIANG Xiaoming, DING Jie, DONG Yue, ZHONG Qin. Recovery of waste SCR catalyst from titanium, vanadium and molybdenum by wet method[J]. Chemical Industry and Engineering Progree, 2015, 34(07): 2039-2042,2048.

赵炜, 于爱华, 王虎, 江晓明, 丁杰, 董岳, 钟秦. 湿法工艺回收板式SCR废弃催化剂中的钛、钒、钼[J]. 化工进展, 2015, 34(07): 2039-2042,2048.

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

湿法工艺回收板式SCR废弃催化剂中的钛、钒、钼

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