DataVXJournal of Microwave Power and Electromagnetic EnergyPaper
journal article·2016-10

Comparison of microwave roasting on wet/dry mixture of diasporic bauxite with alkaline: revealing the intensifying effect of H2O on chemical reaction

Thiquynhxuan Le, Shaohua Ju, Jinhui Peng, Liming Lu, Libo Zhang, Shixing Wang, Liexing Zhou

Journal of Microwave Power and Electromagnetic Energy· Volume 50· Issue 4
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Source abstract

Abstract

Water is a kind of strongly microwave absorbing material. However, water is generally believed that it cannot enhance the effect of heat transfer and mass transfer of reactions at high temperature in the microwave field, due to its performance of easy drying. In this work, the intensifying effect of water on the high temperature reactions in the microwave field is proved. Specifically, the effects of different mixing methods of bauxite and alkaline, including wet mix and dry mix, on phase constitution, microstructure and leaching effect of roasting products in microwave heating process are compared. The results show that compared with the dry mixing, the wet mixing method is more benefit for forming NaAlO2 and Ca2SiO4. The roasted product of wet mix is looser and more homogeneous, which is more conducive to the subsequent leaching process. The leaching rate of Al2O3 is calculated to be 96.68% with wet mix at 800 °C and 92.58% with dry mix at 1000 °C. In addition, the mechanism of intensifying action of water on the high temperature reactions in the microwave field is discussed.
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Research context

OpenAlex topics: Microwave-Assisted Synthesis and Applications · Bauxite Residue and Utilization · Materials Engineering and Processing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China

Yunnan Provincial Key Laboratory of Intensification Metallurgy, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, Yunnan, China

Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, Yunnan, China

Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, China

CSIRO Minerals, Brisbane, Queensland, Australia

Funding

National Natural Science Foundation of China · Applied Basic Research Program of Yunnan Province · PhD Newcomer Award in Yunnan Province · Yunnan Provincial Science and Technology Innovation Talents scheme-Technological Leading Talent

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