Metallurgical properties of CaO–SiO2–Al2O3–4.6wt%MgO–Fe2O3 slag system pertaining to spent automotive catalyst smelting

Ruili Zheng; Jianfang Lü; Weifeng Song; Mudan Liu; Huashan Li; Yong Liu; Xianjin Lü; Zhiyuan Ma

doi:10.1007/s12613-022-2569-2

Volume 30 Issue 5

May 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(5): 886-896

Ruili Zheng, Jianfang Lü, Weifeng Song, Mudan Liu, Huashan Li, Yong Liu, Xianjin Lü, and Zhiyuan Ma, Metallurgical properties of CaO–SiO₂–Al₂O₃–4.6wt%MgO–Fe₂O₃ slag system pertaining to spent automotive catalyst smelting, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 886-896. https://doi.org/10.1007/s12613-022-2569-2

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Ruili Zheng, Jianfang Lü, Weifeng Song, Mudan Liu, Huashan Li, Yong Liu, Xianjin Lü, and Zhiyuan Ma, Metallurgical properties of CaO–SiO2–Al2O3–4.6wt%MgO–Fe2O3 slag system pertaining to spent automotive catalyst smelting, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 886-896. https://doi.org/10.1007/s12613-022-2569-2

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Research Article

Metallurgical properties of CaO–SiO₂–Al₂O₃–4.6wt%MgO–Fe₂O₃ slag system pertaining to spent automotive catalyst smelting

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Corresponding author:
Jianfang Lü E-mail: lvjf1203@163.com
Received: 3 September 2022; Revised: 22 October 2022; Accepted: 1 November 2022; Available online: 3 November 2022

Abstract

Abstract

The metallurgical properties of the CaO–SiO₂–Al₂O₃–4.6wt%MgO–Fe₂O₃ slag system, formed by the co-treatment process of spent automotive catalyst (SAC) and copper-bearing electroplating sludge (CBES), were studied systematically in this paper. The slag structure, melting temperature, and viscous characteristics were investigated by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, FactSage calculation, and viscosity measurements. Experimental results show that the increase of Fe₂O₃ content (3.8wt%–16.6wt%), the mass ratio of CaO/SiO₂ (m(CaO)/m(SiO₂), 0.5–1.3), and the mass ratio of SiO₂/Al₂O₃ (m(SiO₂)/m(Al₂O₃), 1.0–5.0) can promote the depolymerization of silicate network, and the presence of a large amount of Fe₂O₃ in form of tetrahedral and octahedral units ensures the charge compensation of Al³⁺ ions and makes Al₂O₃ only behave as an acid oxide. Thermodynamic calculation and viscosity measurements show that with the increase of Fe₂O₃ content, m(CaO)/m(SiO₂), and m(SiO₂)/m(Al₂O₃), the depolymerization of silicate network structure and low-melting-point phase transformation first occur within the slag, leading to the decrease in melting point and viscosity of the slag, while further increase causes the formation of high-melting-point phase and a resultant re-increase in viscosity and melting point. Based on experimental analysis, the preferred slag composition with low polymerization degree, viscosity, and melting point is as follows: Fe₂O₃ content of 10.2wt%–13.4wt%, m(CaO)/m(SiO₂) of 0.7–0.9 and m(SiO₂)/m(Al₂O₃) of 3.0–4.0. This work provides a theoretical support for slag design in co-smelting process of SAC and CBES.
- spent automotive catalyst;
- co-treatment slag system;
- slag structure;
- melting temperature;
- phase transformation;
- viscosity

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