氟碳铈矿浸出过程配位离子对氟化稀土沉淀-溶解平衡影响机理研究

氟元素是氟碳铈矿冶炼分离过程中产生环境污染、影响稀土回收率及分离效果的根本原因，而且难以回收利用。本课题将配位化学应用于氟碳铈矿盐酸浸出过程中，探索[CeFx]4-x、[AlFx]3-x等配位化学反应对氟化稀土沉淀-溶解平衡的影响，获得最佳配位反应体系；基于热力学原理进行氟碳铈矿低温焙烧-配位浸出过程模拟计算，获得过程反应历程及控制主导因素，并采用Mineral Liberation Analyser (MLA)工艺矿物学参数测试系统以及电化学方法等进行模型验证，揭示低温焙烧-配位浸出过程机理。该项目的开展将为氟碳铈矿中稀土高效提取及氟伴生资源综合利用提供理论依据。

The existence of fluorine is a fundamental cause of environmental pollution and resources waste in bastnaesite smelting separation process. Based on atom economy, this project aims for achieving the comprehensive utilization of fluorine associated in bastnaesite, explores the effect of [CeFx]4-x, [AlFx]3-x coordination chemical reaction on chemistry of rare earths fluoride precipitation-dissolution equilibrium, and obtains the best coordination by applying coordination chemistry to bastnaesite hydrochloric acid leaching process. Based on the simulation of bastnaesite low temperature roasting-coordination leaching process, this project obtains both the reaction process and dominant factor controlling, and uses Mineral Liberation Analyser (MLA) and electrochemical methods for model validation. This project is studied to reveal the mechanism of low temperature roasting-coordination leaching process. The project will provide a theoretical basis for the comprehensive utilization of bastnaesite resources.