Full Text:   <702>

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CLC number: X773

On-line Access: 2021-03-10

Received: 2020-06-10

Revision Accepted: 2020-07-17

Crosschecked: 2021-01-14

Cited: 0

Clicked: 1341

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Hao Zhou

https://orcid.org/0000-0001-9779-7703

Yu-jian Xing

https://orcid.org/0000-0002-1170-3516

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

http://doi.org/10.1631/jzus.A2000192


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",
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publisher="Zhejiang University Press & Springer",
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%T In-situ investigation of melting characteristics of waste selective catalytic reduction catalysts during harmless melting treatment
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%DOI 10.1631/jzus.A2000192

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T1 - In-situ investigation of melting characteristics of waste selective catalytic reduction catalysts during harmless melting treatment
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2000192


Abstract: 
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.

废弃选择性催化还原催化剂无害化熔融处理过程中熔融特性的原位研究

目的:研究废弃选择性催化还原(SCR)催化剂在无害化熔融处理过程中,添加剂对废弃SCR催化剂的熔融特性和矿相转化的影响及其对重金属元素的固定作用,并确定最佳的添加剂配比,为废弃SCR催化剂的无害化处理提供理论支持.
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.
方法:通过热台显微镜、TG/DSC分析、FactSage热力学模拟和XRD分析等手段,研究三种不同添加剂对废弃SCR催化剂的熔融特性和矿相转变的影响,并用ICP-AES分析重金属浸出毒性,以评价添加剂对重金属的固定作用.
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.

关键词:废弃SCR催化剂;热熔融处理;熔融特性;添加剂;热台显微镜;浸出毒性

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