Two-step acid leaching extraction of Fe&Al from karst bauxite and optimization experimental study

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification Pub Date : 2025-02-01 DOI:10.1016/j.cep.2024.110131

Yonglun Wang, Wengang Liu, Wenbao Liu, Mengqiang Chen, Lianjie Hu

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Abstract

Although Bayer process is widely used in bauxite extraction, it challenges karst bauxite with low Al-Si ratio. Therefore, a two-step acid leaching process suitable for karst bauxite was studied based on the engineering strengthening principle, aiming at effectively separating and recovering iron and aluminum. The key parameters affecting extraction efficiency were evaluated by single factor experiments, with emphasis on reaction temperature, ratio of HCl to NH₄HSO₄ concentration, liquid-solid ratio (L/S) and reaction time. In order to optimize extraction parameters and minimize energy consumption, response surface methodology (RSM) is adopted. The optimized process conditions make the aluminum extraction rate reach 92.92 %, and the energy consumption is the least. In addition, XRD, SEM and EDS were used to characterize the leaching residues, which revealed that unreacted kaolinite and ammonium alum were dominant, and their cluster aggregation partially hindered leaching. The two-step acid leaching process in this study provides valuable insights for the process strengthening strategy of extracting iron and aluminum from karst bauxite.

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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.