Phosphate Decomposition by Alkaline Roasting to Concentrate Rare Earth Elements from Monazite of Bangka Island, Indonesia
Tri Purwanti1,2, Mochamad Setyadji3, Widi Astuti4, Indra Perdana1, Himawan Tri Bayu Murti Petrus1
1Universitas Gadjah Mada, Yogyakarta, 55281 Indonesia
2Center for Nuclear Minerals Technology, National Nuclear Energy Agency, Jakarta, 12440 Indonesia
3Center for Accelerator Science and Technology, National Nuclear Energy Agency, Yogyakarta, 55281 Indonesia
4Indonesian Institute of Sciences, Tanjung Bintang, Lampung Selatan, Indonesia
Keywords: Редкоземельные элементы, монацит, восстановительный обжиг, разложение фосфатов, Rare earth elements, monazite, alkaline roasting, phosphate decomposition
Abstract
The article considers extraction of rare elements from monazite and their leaching. In this study, phosphate decomposition process was conducted using alkaline roasting. The results showed that the phosphate decomposition of monazite from Bangka Island increased with increasing temperature and increasing monazite/NaOH mass ratio. Analysis of the decomposition rate on the basis of shrinking core model revealed that the rate could be appropriately expressed by the equation based on mixed control of diffusion through a residual layer and surface chemical reaction.
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