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Research Article | Publishing Language: Chinese | Open Access

Resource utilization of high aluminum alkaline waste solution to prepare active alumina carrier

Qian LI1, Yuqi HAN1, Yan ZHANG1( ), Yongbin YANG1, Haigang DONG2, Anrui DU1
School of Minerals Processing and Bioengineering, Central South University, Changsha Hunan 410083, China
Yunnan Precious Metals Laboratory Co., Ltd., Kunming Yunan 650101, China
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Abstract

The recycling of precious metals from spent aluminum-based catalysts generates a large amount of high-Al alkaline waste solutions, which not only cause a serious waste of aluminum resources, but also may have a negative impact on the environment due to their strong alkalinity. At present, there are few researches on the resource utilization of these high-Al alkaline waste solutions, an investigation into the re-preparation of active alumina carrier from a high-Al alkaline waste solution ([Al] 6.594 g/L, pH 14) of spent Pd-Al2O3 catalysts by the carbonating-roasting process was performed in this paper. First, the carbonating method was adopted to treat the waste solution, converting the Al therein to pseudo-boehmite; then, the pseudo-boehmite underwent roasting to re-make alumina carrier. Experimental results showed that the P content of 2% ~3% and the caustic ratio (i.e., [Na2O] to [Al2O3] ratio) of 1.5 in the waste solutions are conducive to the significant increase in the specific surface area and dispersion index for the pseudo-boehmite products. In addition, the pseudo-boehmite, after performing, was subjected to roasting under the conditions of temperature 450 ℃, holding time 3.5 h, and heating rate 100 ℃/h, which successfully obtained γ-Al2O3 catalyst carrier that meet the product quality index. This process can achieve the high-efficient resource reuse of high-Al alkaline waste solutions with eco-friendliness and without generation of the three wastes, thus making it promising for industrial application.

Keywords

spent Al2O3-based catalysthigh-Al alkaline waste solutionpseudo-boehmiteactive alumina carrier
CLC number: TQ133.1 Document code: A Article ID: 2096-2193(2025)03-0563-10

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Journal of Mining Science and Technology
Volume 10 Issue 3,
June 2025
Pages 563-572
DOI: 10.19606/j.cnki.jmst.2025013
Cite this article:
LI Q, HAN Y, ZHANG Y, et al. Resource utilization of high aluminum alkaline waste solution to prepare active alumina carrier. Journal of Mining Science and Technology, 2025, 10(3): 563-572. https://doi.org/10.19606/j.cnki.jmst.2025013

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Received: 11 June 2024
Revised: 10 December 2024
Published: 30 June 2025
© The Author(s) 2025

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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