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Numerical simulation of preparation of ultrafine cerium oxides using jet-flow pyrolysis

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Abstract

Ultrafine rare-earth oxides (REOs) are widely applied in all fields of daily life, but the conventional preparation methods are limited by a long procedure, low efficiency and severe environmental pollution. Our team has independently developed a jet pyrolysis reactor for the preparation of ultrafine cerium oxides, and this process has theoretical significance and practical application values. In this study, gas–solid pyrolysis reactions inside the jet-flow pyrolysis reactor were numerically simulated. We performed a coupling computation of the combustion, phase transformation and gas–solid reaction on Fluent and user-defined functions. We characterized the flows of different phases as well as the compositions and distributive laws of the reactants/products in the reactor. The gas-phase inlet velocity and dynamic pressure/additional pressure were related by a quadratic function. The velocity at the throat inlet changed the most, and the outlet velocity was very stable. The CeO2 concentrations were obviously stratified. This study enriches theories of jet-flow pyrolysis and theoretically underlies the optimization and popularization of self-developed pyrolysis reactors.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (No. 51904069), the Natural Science Foundation of Hebei Province of China (No. E2019501085), the Colleges and Universities in Hebei Province Science and Technology Research Youth Fund (No. QN2019312), the Fundamental Research Funds for the Central Universities (No. N172303012) and the National Science and Technology Support Program (No. 2012BAE01B02).

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Authors and Affiliations

  1. Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education, Special Metallurgy and Process Engineering Institute, Northeastern University, Shenyang, 110819, China

    Chao Lv, Ting-An Zhang, Zhi-He Dou & Qiu-Yue Zhao

  2. School of Control Engineering, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, China

    Chao Lv

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  1. Chao Lv
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  2. Ting-An Zhang
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  4. Qiu-Yue Zhao
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Correspondence to Ting-An Zhang.

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Lv, C., Zhang, TA., Dou, ZH. et al. Numerical simulation of preparation of ultrafine cerium oxides using jet-flow pyrolysis. Rare Met. 38, 1160–1168 (2019). https://doi.org/10.1007/s12598-019-01337-9

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  • DOI: https://doi.org/10.1007/s12598-019-01337-9

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