Mechanism of leaching zinc from low-grade zinc oxide by ultrasonic enhancement

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification Pub Date : 2025-02-03 DOI:10.1016/j.cep.2025.110203

Yihong Dang , Zhifei Yang , Guo Lin , Benkang Zhai , Heng Zhang , Xiaowei Sheng , Shiwei Li , Libo Zhang

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Abstract

In view of the depletion of sphalerite and the shortage of zinc resources, zinc leaching from low-grade zinc oxide (LZO) had become an important research direction. A new technology of ultrasonic enhanced H₂SO₄ solution leaching of LZO was proposed. The effects of H₂SO₄ solution concentration, ultrasonic power, reaction temperature, solid-liquid ratio and agitation rate on zinc leaching rate and zinc leaching kinetics were investigated. The results showed that the leaching rate of ultrasonic-enhanced leaching under optimal conditions was 95.45 %, which was 3.61 % higher than that of the traditional leaching procedure. The kinetic analysis showed that the process of ultrasonic-enhanced leaching of LZO was controlled by product diffusion and interfacial reaction, and the ultrasonic enhancement of leaching conditions reduced the activation energy from 21.375 kJ/mol to 13.912 kJ/mol. In addition, the characterization analysis showed that ultrasound opened and dissociated the particles in the wrapped state, exposing more interfaces and accelerating the reaction. This study could accelerate the promotion and application of ultrasonic enhancement in the field of enhancement leaching of low-grade ores.

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来源期刊

Chemical Engineering and Processing - Process Intensification 工程技术-工程：化工

CiteScore

7.80

自引率

9.30%

发文量

408

审稿时长

49 days

期刊介绍： Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.