Leaching Behavior of Waste Barrier Material with Sulfuric Acid

Li, Saiya; Zhao, Yujie; Cheng, Junfeng; Chen, Yuting; Liu, Weiping; Sun, Wei

doi:10.3390/min15030323

Open AccessArticle

Leaching Behavior of Waste Barrier Material with Sulfuric Acid

by

Saiya Li

¹,

Yujie Zhao

¹,

Junfeng Cheng

¹,

Yuting Chen

¹,

Weiping Liu

^1,2,*

and

Wei Sun

^1,2

¹

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

²

Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization, Central South University, Changsha 410083, China

^*

Author to whom correspondence should be addressed.

Minerals 2025, 15(3), 323; https://doi.org/10.3390/min15030323

Submission received: 16 February 2025 / Revised: 15 March 2025 / Accepted: 15 March 2025 / Published: 19 March 2025

(This article belongs to the Special Issue Advances in Mineral Processing and Extractive Metallurgy of Base and Precious Metals)

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Abstract

The comprehensive recycling of aluminum electrolysis cell waste barrier material is urgent. This study focuses on the sulfuric acid leaching of waste barrier material, systematically examining the effects of factors such as reaction temperature, liquid-to-solid ratio, sulfuric acid concentration, and reaction time on the leaching of elements like lithium, aluminum, sodium, and silicon. The experimental results show that under the conditions of 0.9 mol/L sulfuric acid concentration, a liquid-to-solid ratio of 20:1, a reaction temperature of 90 °C, and a reaction time of 1.5 h, the leaching rates were 84.5% for lithium, 85.6% for aluminum, 98.5% for sodium, and 4.8% for silicon. The sulfuric acid leaching process of the waste barrier material follows a shrinking core model and is controlled by internal diffusion. The apparent activation energies for the leaching reactions of lithium, aluminum, and sodium were 4.29 kJ/mol, 8.99 kJ/mol, and 9.11 kJ/mol, respectively. The selective leaching of lithium, sodium, and aluminum from silicon was successfully achieved in the sulfuric acid leaching of the waste barrier material.

Keywords: waste barrier material; lithium; sulfuric acid; leaching; kinetics

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MDPI and ACS Style

Li, S.; Zhao, Y.; Cheng, J.; Chen, Y.; Liu, W.; Sun, W. Leaching Behavior of Waste Barrier Material with Sulfuric Acid. Minerals 2025, 15, 323. https://doi.org/10.3390/min15030323

AMA Style

Li S, Zhao Y, Cheng J, Chen Y, Liu W, Sun W. Leaching Behavior of Waste Barrier Material with Sulfuric Acid. Minerals. 2025; 15(3):323. https://doi.org/10.3390/min15030323

Chicago/Turabian Style

Li, Saiya, Yujie Zhao, Junfeng Cheng, Yuting Chen, Weiping Liu, and Wei Sun. 2025. "Leaching Behavior of Waste Barrier Material with Sulfuric Acid" Minerals 15, no. 3: 323. https://doi.org/10.3390/min15030323

APA Style

Li, S., Zhao, Y., Cheng, J., Chen, Y., Liu, W., & Sun, W. (2025). Leaching Behavior of Waste Barrier Material with Sulfuric Acid. Minerals, 15(3), 323. https://doi.org/10.3390/min15030323

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Leaching Behavior of Waste Barrier Material with Sulfuric Acid

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