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.

中文翻译：

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印度尼西亚邦加岛独居石碱焙烧分解磷酸盐浓缩稀土元素

本文考虑从独居石中提取稀有元素及其浸出。在这项研究中，磷酸盐分解过程使用碱焙烧进行。结果表明，随着温度的升高和独居石/NaOH质量比的增加，邦加岛独居石的磷酸盐分解率增加。基于收缩核模型的分解速率分析表明，该速率可以通过基于残留层扩散和表面化学反应混合控制的方程来适当表达。