CaO–SiO2–Al2O3–4.6wt%MgO–Fe2O3废汽车催化剂熔炼渣系的冶金特性研究

郑瑞立; 吕建芳; 宋卫锋; 刘牡丹; 李华山; 刘勇; 吕先谨; 马致远

doi:10.1007/s12613-022-2569-2

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May 2023

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文章导航 > 矿物冶金与材料学报（英文） > 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

Cite this article as:

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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研究论文

CaO–SiO₂–Al₂O₃–4.6wt%MgO–Fe₂O₃废汽车催化剂熔炼渣系的冶金特性研究

1)
广东工业大学环境科学与工程学院，广州510006，中国
2)
广东省科学院资源利用与稀土开发研究所，广州510650，中国
3)
稀有金属分离与综合利用国家重点实验室，广州510650，中国
4)
广东省矿产资源开发和综合利用重点实验室, 广州510650，中国

通讯作者:
吕建芳 E-mail: lvjf1203@163.com

文章亮点

(1) 系统地研究了CaO−SiO₂−Al₂O₃−4.6wt%MgO−Fe₂O₃五元渣系的熔渣结构及各组元的作用。

(2) 结合热力学计算和粘度测试探明了CaO−SiO₂−Al₂O₃−4.6wt%MgO−Fe₂O₃五元渣系的熔点及粘性转变规律。

(3) 总结并提出了优选的低聚合度、粘度和熔点的CaO−SiO₂−Al₂O₃−4.6wt%MgO−Fe₂O₃五元渣系炉渣组成。

中文摘要

本文系统地研究了废汽车催化剂（SAC）与含铜电镀污泥（CBES）协同熔炼过程中形成的CaO−SiO₂−Al₂O₃−4.6wt%MgO−Fe₂O₃五元渣系的冶金特性。通过傅立叶变换红外吸收光谱、拉曼光谱、FactSage热力学计算和粘度测试研究了该渣系的熔渣结构、熔化温度和粘度特性。实验结果表明，Fe₂O₃含量（3.8wt%−16.6wt%）、CaO/SiO₂质量比（0.5−1.3）和SiO₂/Al₂O₃质量比（1.0−5.0）的提高可以促进硅酸盐网络的解聚，同时以四面体和八面体单元形式存在的大量Fe₂O₃确保了Al³⁺离子的电荷补偿，使得Al₂O₃仅表现为酸性氧化物。热力学计算和粘度测试结果表明，随着Fe₂O₃含量、CaO/SiO₂比和SiO₂/Al₂O₃比的增加，熔渣中发生硅酸盐网络结构解聚和低熔点相变，促进了熔点和粘度的降低；而进一步增加会导致新的高熔点物相形成，反而导致粘度和熔点回升。根据实验分析，优选的低聚合度、粘度和熔点炉渣组成为：Fe₂O₃含量为10.2wt%−13.4wt%，CaO/SiO₂比为0.7−0.9和SiO₂/Al₂O₃比为3.0−4.0。本研究为SAC和CBES协同熔炼过程中的炉渣设计提供了理论支持。

关键词:

Research Article

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

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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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