Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching

Fengjuan Zhang; Chenhui Liu; Srinivasakannan Chandrasekar; Yingwei Li; Fuchang Xu

doi:10.1007/s12613-023-2727-1

Volume 31 Issue 1

Jan. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(1): 91-105

Fengjuan Zhang, Chenhui Liu, Srinivasakannan Chandrasekar, Yingwei Li, and Fuchang Xu, Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 91-105. https://doi.org/10.1007/s12613-023-2727-1

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Fengjuan Zhang, Chenhui Liu, Srinivasakannan Chandrasekar, Yingwei Li, and Fuchang Xu, Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 91-105. https://doi.org/10.1007/s12613-023-2727-1

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Research Article

Preparation of sodium molybdate from molybdenum concentrate by microwave roasting and alkali leaching

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Corresponding authors:
Chenhui Liu E-mail: liu-chenhui@hotmail.com

Srinivasakannan Chandrasekar E-mail: srinivasa.chandrasekar@ku.ac.ae
Received: 15 March 2023; Revised: 24 July 2023; Accepted: 16 August 2023; Available online: 18 August 2023

Abstract

Abstract

The preparation process of sodium molybdate has the disadvantages of high energy consumption, low thermal efficiency, and high raw material requirement of molybdenum trioxide, in order to realize the green and efficient development of molybdenum concentrate resources, this paper proposes a new process for efficient recovery of molybdenum from molybdenum concentrate and preparation of sodium molybdate by microwave-enhanced roasting and alkali leaching. Thermodynamic analysis indicated the feasibility of oxidation roasting of molybdenum concentrate. The effects of roasting temperature, holding time, and power-to-mass ratio on the oxidation product and leaching product sodium molybdate (Na₂MoO₄·2H₂O) were investigated. Under the optimal process conditions: roasting temperature of 700°C, holding time of 110 min, and power-to-mass ratio of 110 W/g, the molybdenum state of existence was converted from MoS₂ to MoO₃. The process of preparing sodium molybdate by alkali leaching of molybdenum calcine was investigated, the optimal leaching conditions include a solution concentration of 2.5 mol/L, a liquid-to-solid ratio of 2 mL/g, a leaching temperature of 60°C, and leaching solution termination at pH 8. The optimum conditions result in a leaching rate of sodium molybdate of 96.24%. Meanwhile, the content of sodium molybdate reaches 94.08wt% after leaching and removing impurities. Iron and aluminum impurities can be effectively separated by adjusting the pH of the leaching solution with sodium carbonate solution. This research avoids the shortcomings of the traditional process and utilizes the advantages of microwave metallurgy to prepare high-quality sodium molybdate, which provides a new idea for the high-value utilization of molybdenum concentrate.
- molybdenum metallurgy;
- microwave oxidation roasting;
- removing impurities;
- sodium hydroxide leaching

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