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Investigation of Leaching Kinetics of Molybdenum from MoO3 Concentrate in Ammonia–Ammonium Nitrate Solutions

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Abstract

MoO3 is a widely accessible foundation material and the primary compound used to produce numerous molybdenum products. The ore was first roasted, and the leaching behavior of concentrated molybdenite mineral was assessed. The optimal conditions for the leaching process were identified in the second step, and in a subsequent stage, the process' kinetics were assessed. Ammonia and ammonium nitrate concentration were used as independent variables in the trials, and the central composite design approach was used to analyze the results. At the conclusion of the tests, the optimum concentrations of ammonia and ammonium nitrate were found to be 2.42 mol/L and 1.86 mol/L, respectively. On the rate at which molybdenum leached from MoO3, the influences of temperature, stirring speed, solid-to-liquid ratio, and particle size were investigated. It was found that the leaching rate increased when temperature and stirring speed increased, along with decreasing the solid-to-liquid ratio and particle size. Leaching efficiency of molybdenum (93%) such as temperature 20 °C, 1.859 mol/L ammonium nitrate concentration, 2.419 mol/L ammonia concentration, solid/liquid ratio 6/100 g/mL, stirring speed 400 rpm, and average particle size 0.115 mm optimum conditions have been achieved. The kinetic study proposed a mathematical model for the leaching process, which revealed that the leaching kinetics matched the Avrami model. This process' activation energy was determined to be 22.66 kJ/mol. Calcium molybdate is used in various fields, such as construction, transportation, anti-corrosion pigments, and flame retardants.

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Acknowledgements

We thank Mineral Research and Exploration Institute (MTA), Ankara, Türkiye. for providing us with free samples. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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  1. Department of Chemistry and Chemical Processes, Tunceli Vocational School, Munzur University, 62000, Tunceli, Turkey

    Mehmet Kayra Karacahan

  2. Rare Earth Elements Application and Research Center, Munzur University, 62000, Tunceli, Turkey

    Mehmet Kayra Karacahan

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Karacahan, M.K. Investigation of Leaching Kinetics of Molybdenum from MoO3 Concentrate in Ammonia–Ammonium Nitrate Solutions. J. Sustain. Metall. 9, 1564–1577 (2023). https://doi.org/10.1007/s40831-023-00748-4

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