Drying Kinetics of Microwave-Assisted Drying of Leaching Residues from Hydrometallurgy of Zinc

Author:

Tian Chunlan1,Zhou Ju1,Ren Chunxiao1,Omran Mamdouh2ORCID,Zhang Fan1,Tang Ju1

Affiliation:

1. Kunming Key Laboratory of Energy Materials Chemistry, Yunnan Minzu University, Kunming 650500, China

2. Faculty of Technology, University of Oulu, 90570 Oulu, Finland

Abstract

In the hydrometallurgical process of zinc production, the residue from the leaching stage is an important intermediate product and is treated in a Waelz kiln to recover valuable metals. To ensure optimal results during the Waelz kiln process, it is necessary to pre-treat the residues by drying them first due to their higher water content. This work studies the residue’s drying process using microwave technology. The study results indicate that microwave technology better removes the residue’s oxygen functional groups and moisture. The dehydration process’s effective diffusion coefficient increases as the microwave’s heating power, the initial moisture content, and the initial mass increase. The Page model is appropriate for imitating the drying process, and the activation energy of the drying process for the residues is −13.11217 g/W. These results indicate that microwave technology efficiently dries the residues from the leaching stage. Furthermore, this study provides a theoretical basis and experimental data for the industrial application of microwave drying.

Funder

Yunnan Fundamental Research Projects

Publisher

MDPI AG

Subject

General Materials Science

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