Abstract
Molybdenum (Mo) has wide applications like as alloying elements in steel industries and in experimental laboratories as a catalyst for organic synthesis and as scintillating crystals in high-energy physics experiments. The primary mineral resources of Mo have been ceaselessly exploited and are insufficient to meet the demand in manufacturing industries and experimental researches. Separation, purification, recovery and reuse of Mo will, therefore, be of great importance for environmental conservation and sustainable development. The objective of this study was to recover Mo and calcium (Ca) from crystal wastes. Mo and Ca were recovered from CaMoO4 scintillating crystal wastes in the forms of MoO3 and CaCO3 by adopting nitric acid and hydrochloric acid leaching schemes. About 98% recovery yield efficiency for both elements was obtained through hydrochloric acid leaching. The concentrations of impurity elements like strontium, barium, lead, thorium and uranium in the final products were also reduced by several dozen times as compared to the initial wastes. The finding of this study showed that the hydrochloric acid leaching method could be applied for a rapid and efficient recovery of Mo and Ca from CaMoO4 wastes on a large scale.
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This research was funded by the Institute for Basic Science, Korea under project code IBS-R016-D1 and this research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2018R1D1A1B07048941).
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Aryal, P., Karki, S., Choi, Y. et al. Rapid simultaneous recovery and purification of calcium and molybdenum from calcium molybdate-based crystal waste. J Mater Cycles Waste Manag 21, 1384–1390 (2019). https://doi.org/10.1007/s10163-019-00888-4
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DOI: https://doi.org/10.1007/s10163-019-00888-4