无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ
催化材料

碳热还原/熔融分离废SCR催化剂中有价金属

  • 李朴芳 ,
  • 穆林 ,
  • 王社斌
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  • 太原理工大学材料科学与工程学院,山西太原 030024
李朴芳(1992— ),男,硕士研究生,主要从事废SCR催化剂中有价金属回收及利用的研究。

收稿日期: 2019-08-08

  网络出版日期: 2020-02-26

基金资助

北京科技大学钢铁冶金新技术国家重点实验室开放基金(KF18-02)

Carbon thermal reduction/melting separation of valuable metals from spent SCR catalysts

  • Pufang Li ,
  • Lin Mu ,
  • Shebin Wang
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  • College of Material Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China

Received date: 2019-08-08

  Online published: 2020-02-26

摘要

在热力学计算的基础上,把废SCR催化剂(钒钛系)与碳、铁和石灰等原料混合后装入直流电弧炉中熔化、还原,用SEM、XRD分析渣/铁两相试样的化学成分与物相,研究废SCR催化剂再回收的基础问题,并探讨其碳热还原/熔融分离行为和机理。结果表明,有价金属回收率随n(碳)/n(氧)、温度和碱度等条件而变。在熔池温度为1 650 ℃的条件下,回收废SCR催化剂中二氧化钛、金属的最佳参数为:n(碳)/n(氧)为1.0、碱度为1.0;在此条件下可实现含钒、钨的铁合金与高钛渣的完全分离,铁、钒、钨和二氧化钛的回收率分别达到99%、97%、92%和93.5%。这对于开发废SCR催化剂的回收再利用技术,实现可持续发展具有重大的现实意义和经济价值。

本文引用格式

李朴芳 , 穆林 , 王社斌 . 碳热还原/熔融分离废SCR催化剂中有价金属[J]. 无机盐工业, 2020 , 52(1) : 93 -98 . DOI: 10.11962/1006-4990.2019-0087

Abstract

On the basis of thermodynamics calculate,the spent SCR catalyst(V-Ti) was mixed with C,Fe and CaO and then melted and reduced in a DC arc furnace.The chemical composition and phase of slag/iron samples were analyzed by SEM and XRD.The basic problem of spent SCR catalyst recycling was studied,and the behavior and mechanism of carbon thermal reduction/melting separation were discussed.Results showed that the recovery rate of the valuable metal changed with the amount-of-substance ratio of C to O,temperature and basicity etc..Under the condition of molten pool temperature of 1 650 ℃,the optimal parameters of recycling TiO 2/metal from spent SCR catalyst were as follows:n(C)/n(O)=1.0 and basicity was 1.0. This can realize the complete separation of ferroalloy containing V and W and high titanium slag.The recovery of Fe,V,W and TiO2 could reach around 99%,97%,92% and 93.5%,respectively.This is of great practical significance and economic value for the development of spent SCR catalyst recycling technology and the realization of sustainable development.

参考文献

[1] 俞珠峰, 杜铭华, 吕文斌 , 等. 洁净煤技术发展及应用[M]. 北京: 化学工业出版社, 2004.
[2] 王家诚 . 煤炭清洁利用和结构调整——中国煤炭可持续发展的必然选择[J]. 煤炭经济研究, 2003(4):6-12.
[3] GB 13223—2011 火电厂大气污染物排放标准[S].
[4] 夏涵泊, 李保山 . 烟气中一氧化氮的液相吸收与综合利用[J]. 无机盐工业, 2016,48(1):54-57.
[5] 陈其颢, 朱林 . SCR失效催化剂及其处置与再利用技术[J]. 电力科学与环保, 2012,28(3):27-28.
[6] Madia G, Koebei M, Elsenner M , et al. The effect of an oxidation prcatalyst on the NOx reduction by ammonia SCR[J]. Industrial & Engineering Chemistry Research, 2002,41(15):3512-3517.
[7] Wachs I E, DEO G, Weckhuysen B M , et al. Selective catalytic reduction of NO with NH3 over supported vanadia catalysts[J]. Journal of Catalysis, 1996,161(1):211-221.
[8] Amiridis M D, Solar J P . Selective catalytic reduction of nitric oxide by ammonia over V2O5/TiO2,V2O5/TiO2/SiO2,and V2O5-WO3/TiO2 catalysts:Effect of vanadia content on the activation energy[J]. Industrial and Engineering Chemistry Research, 1996,35(3):978-981.
[9] 高岩, 栾涛, 彭吉伟 , 等. 燃煤电厂真实烟气条件下SCR催化剂脱硝性能[J]. 化工学报, 2013,64(7):2611-2618.
[10] Zheng Y, Jensen A D, Johnsson J E . Laboratory investigation of selective catalytic reduction catalysts:Deactivation by potassium compounds and catalyst generation[J]. Industrial & Engineering Chemistry Research, 2004,43(4):941-947.
[11] 李俊峰, 张兵兵, 李翼然 . 基于钒钛基SCR法废脱硝催化剂的回收利用[J]. 广州化工, 2014,42(24):130-132.
[12] 张琛, 刘建华, 杨晓博 , 等. 超声强化废SCR催化剂浸出V和W的研究[J]. 功能材料, 2015,46(20):20063-20067.
[13] 刘子林, 王宝东, 马瑞新 , 等. 废SCR催化剂钠化焙烧回收钨和钒的机理探究[J]. 无机盐工业, 2016,48(7):63-67.
[14] 景中建, 郝喜才 . 从废钒催化剂中回收钒的实验研究[J]. 无机盐工业, 2010,42(6):55-57.
[15] Bratberg J, Frisk K . An experimental and theoretical analysis of the phase equilibria in the Fe-Cr-V-C system[J]. Metallurgical and Materials Transactions A, 2004,35(12):3649-3663.
[16] Lee B J, Lee D N . A thermodynamic evaluation of the Fe-Cr-V-C system[J]. Journal of Phase Equilibria, 1992,13(4):349-364.
[17] Park J O, Jeong I H, Jung S M , et al. Metal-slag separation behaviors of pellets of consisted of iron,graphite and CaO-Al2O3 based slag powders[J]. ISIJ International, 2014,54(7):1530-1538.
[18] Ohno K I, Kaimoto M, Maeda T , et al. Effect of slag melting behavior on metal-slag separation temperature in powdery iron,slag and carbon mixture[J]. ISIJ International, 2011,51(8):1279-1284.
[19] Wright S, Zhang L, Sun S , et al. Viscosity of a CaO-MgO-Al2O3-SiO2 melt containing spinel particles at 1 646 K[J]. Metallurgical and Materials Transactions B, 2000,31(1):97-104.
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