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Process and Kinetics of Preparing Ammonium Molybdate from Molybdenum Concentrate by Microwave Roasting-Ammonia Leaching

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Abstract

On the basis of previous work, this paper systematically investigates the influence parameters and leaching kinetics of the ammonia leaching process of molybdenum calcine obtained by microwave roasting. The conditions of the ammonia leaching process of calcined molybdenum were optimized by changing the parameters of ammonia concentration, solid–liquid ratio, and leaching temperature. The results show that, when the concentration of ammonia was 25%, the mass of calcined molybdenum and the volume of ammonia were 1/2 g/ml, the leaching temperature was 75°C, and the leaching time was 60 min, the leaching efficiency of molybdenum can reach 91.74%, and the content of ammonium molybdate in the leaching product was 97.23 wt.%. In the leaching process, MoO3 in the solid phase is dissolved by ammonia to form ammonium molybdate, which conforms to the shrinking core model. The activation energy of the reaction is 57.8 kJ/mol and the rate control step is determined by the mixed model of chemical reaction and product layer diffusion. The apparent rate equation is expressed as: \(\frac{1}{3}\ln \left( {1 - x} \right) + \left( {1 - x} \right)^{{ - \frac{1}{3}}} - 1 = 14.97\omega_{{{\text{ammonia}}}}^{2.004} (L/S)^{ - 2.44} e^{{\frac{ - 57800}{{{\text{RT}}}}}} t\).

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Acknowledgements

The authors acknowledge the financial supports from the National Natural Science Foundation of China (No. 51964046), and Yunnan Province Ten Thousand Youth Program Top Talents (No. YNWR-QNBJ-2019-066).

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Authors and Affiliations

  1. School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650500, People’s Republic of China

    Fengjuan Zhang, Qian Wang, Chenhui Liu, Mei Wei, Fang Wang & Jiyun Gao

  2. Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming, 650093, People’s Republic of China

    Qian Wang, Chenhui Liu & Jiyun Gao

  3. Chemical Engineering Department, Khalifa University, Abu Dhabi, 127728, UAE

    Chandrasekar Srinivasakannan

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Contributions

Fengjuan Zhang: Writing–review & editing, Data curation. Qian Wang: Formal analysis, Validation. Chenhui Liu: Supervision, Project administration, Resources. Mei Wei: Software, Validation. Fang Wang, Jiyun Gao: Conceptualization, Validation, Resources. C. Srinivasakannan: Formal analysis, Investigation, Conceptualization.

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Correspondence to Chenhui Liu or Chandrasekar Srinivasakannan.

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Zhang, F., Wang, Q., Liu, C. et al. Process and Kinetics of Preparing Ammonium Molybdate from Molybdenum Concentrate by Microwave Roasting-Ammonia Leaching. JOM (2024). https://doi.org/10.1007/s11837-024-06571-w

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