Developing a highly efficient method to recover uranium from metallurgical waste can alleviate the shortage of uranium resources. However, the dissociation of uranium is limited by the ultrafine uranium particles embedded in the gangue. Dilute alkali pretreatment is an effective process to improve the dissociation rate of uranium. Moreover, the leaching kinetics of the pulverized gangue during the pretreatment process is the decisive factor affecting the efficiency of uranium dissociation. The traditional shrinking core model cannot accurately depict the leaching kinetics of low-grade uranium ore due to the encapsulation of gangue minerals. The Avrami equation was used to investigate the dissociation kinetics of uranium during pretreatment. The results showed that the alkali pretreatment decreased the activation energy and reaction order of subsequent reactions by pulverizing the gangue structure and producing a leaching “micro-path”, thus significantly reducing the dependence of the uranium acid leaching process on temperature and acid concentration.

中文翻译：

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清洁浸出法从含铀放射性冶金废物中脱铀的机理

开发一种从冶金废料中回收铀的高效方法可以缓解铀资源的短缺。然而，铀的解离受到嵌入脉石中的超细铀颗粒的限制。稀碱预处理是提高铀解离率的有效工艺。此外，预处理过程中粉状脉石的浸出动力学是影响铀解离效率的决定性因素。由于脉石矿物被包裹，传统的收缩岩心模型无法准确描述低品位铀矿的浸出动力学。Avrami 方程用于研究铀在预处理过程中的解离动力学。