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On-line Access: 2021-03-10

Received: 2020-06-10

Revision Accepted: 2020-07-17

Crosschecked: 2021-01-14

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Citations:  Bibtex RefMan EndNote GB/T7714


Hao Zhou


Yu-jian Xing


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Journal of Zhejiang University SCIENCE A 2021 Vol.22 No.3 P.207-221


In-situ investigation of melting characteristics of waste selective catalytic reduction catalysts during harmless melting treatment

Author(s):  Hao Zhou, Yu-jian Xing, Jia-nuo Xu, Ming-xi Zhou

Affiliation(s):  State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   zhouhao@zju.edu.cn

Key Words:  Waste selective catalytic reduction (SCR) catalyst, Thermal melting treatment, Melting characteristics, Additives, Heating stage microscope, Leaching toxicity

Hao Zhou, Yu-jian Xing, Jia-nuo Xu, Ming-xi Zhou. In-situ investigation of melting characteristics of waste selective catalytic reduction catalysts during harmless melting treatment[J]. Journal of Zhejiang University Science A, 2021, 22(3): 207-221.

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author="Hao Zhou, Yu-jian Xing, Jia-nuo Xu, Ming-xi Zhou",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T In-situ investigation of melting characteristics of waste selective catalytic reduction catalysts during harmless melting treatment
%A Hao Zhou
%A Yu-jian Xing
%A Jia-nuo Xu
%A Ming-xi Zhou
%J Journal of Zhejiang University SCIENCE A
%V 22
%N 3
%P 207-221
%@ 1673-565X
%D 2021
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2000192

T1 - In-situ investigation of melting characteristics of waste selective catalytic reduction catalysts during harmless melting treatment
A1 - Hao Zhou
A1 - Yu-jian Xing
A1 - Jia-nuo Xu
A1 - Ming-xi Zhou
J0 - Journal of Zhejiang University Science A
VL - 22
IS - 3
SP - 207
EP - 221
%@ 1673-565X
Y1 - 2021
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2000192

Selective catalytic reduction (SCR) catalyst waste is a hazardous solid waste that seriously threatens the environment and public health. In this study, a thermal melting technology is proposed for the treatment of waste SCR catalysts. The melting characteristics and mineral phase transformation of waste SCR catalysts blended with three different groups of additives were explored by heating stage microscopy, thermogravimetric analysis/differential scanning calorimetry (TG/DSC) analysis, thermodynamic simulation, and X-ray diffraction (XRD) analysis; heavy metal leaching toxicity was tested by inductively coupled plasma-atomic emission spectrometry (ICP-AES) analysis. The results indicated that the melting point of waste SCR catalysts can be effectively reduced with proper additives. The additive formula of 39.00% Fe2O3 (in weight), 6.50% CaO, 3.30% SiO2, and 1.20% Al2O3 achieves the optimal fluxing behavior, significantly decreasing the initial melting temperature from 1223 °C to 1169 °C. Furthermore, the whole heating process of waste SCR catalysts can be divided into three stages: the solid reaction stage, the sintering stage, and the primary melting stage. The leaching concentrations of V, As, Pb, and Se are significantly reduced, from 10.64, 1.054, 0.195, and 0.347 mg/L to 0.178, 0.025, 0.048, and 0.003 mg/L, respectively, much lower than the standard limits after melting treatment, showing the strong immobilization capacity of optimal additives for heavy metals in waste SCR catalysts. The results demonstrate the feasibility of harmless melting treatments for waste SCR catalysts with relatively low energy consumption, providing theoretical support for a novel method of disposing of hazardous waste SCR catalysts.


创新点:1. 对加入添加剂后废弃SCR催化剂的无害化熔融处理过程进行了原位研究;2. 确定了最佳的添加剂配比,进而显著降低了重金属浸出浓度.
结论:1. 添加剂可有效降低废弃SCR催化剂的熔点;39.00% Fe2O3、6.50% CaO、3.30% SiO2和1.20% Al2O3的添加剂配方具有最佳的助熔性能,可将初始熔化温度从1223 °C降至1169 °C.2. 废弃SCR催化剂的加热过程可分为三个阶段:固相反应阶段、烧结阶段和初始熔融阶段.3. 熔融处理可显著降低重金属V、As、Pb和Se的浸出浓度;以较低的能耗对废弃SCR催化剂进行无害化熔融处理是可行的.


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