我国稀土资源冶炼分离技术研究进展

Research Progress on Rare Earth Ore Metallurgy and Separation Technology in China

  • 摘要: 本文综述了我国不同类型稀土资源的冶炼及分离提纯技术研究现状及进展。目前,矿物型稀土资源中混合型稀土矿的冶炼方法主要以浓硫酸焙烧-水浸、碱法分解和酸浸碱溶工艺为主,单一氟碳铈矿冶炼方法主要以氧化焙烧-硫酸浸出法、碱法冶炼和火法冶炼为主;风化壳淋积型稀土矿湿法冶金技术主要为硫酸铵原地浸出-碳酸氢铵沉淀工艺,但是目前逐渐被更加清洁的复合镁盐浸出工艺所取代。稀土的分离提纯方法主要包括化学沉淀法、溶剂萃取法、离子交换法、萃取色层法和液膜分离法,本文在综合对比分析各种分离提纯方法利弊的基础上,提出了稀土分离提纯的新方法-萃取沉淀法,并针对稀土资源的综合利用提出了相关建议。

     

    Abstract: In this paper, the research status and progress on metallurgy, separation and purification process for different rare earth resources in China are reviewed. At present, the metallurgy methods for mixed rare earth minerals mainly include concentrated sulfuric acid roasting-water leaching, alkaline decomposition process and acid leaching-alkali dissolving process; the metallurgy methods for bastnaesite mainly include oxidation roasting-sulfuric acid leaching, alkali metallurgy and pyrometallurgy process. The hydrometallurgical technology for weathering crust leached rare earth ores is mainly composed of ammonium sulfate in-situ leaching and ammonium bicarbonate precipitation process, however, which is currently being replaced by cleaner magnesium salt leaching process. Rare earth separation and purification methods mainly include chemical precipitation, solvent extraction, ion exchange, extraction chromatography and liquid membrane separation methods. On the basis of comprehensive comparison between the advantages and disadvantages of different separation and purification methods, a new method is proposed for rare earth separation and purification-extraction precipitation process; besides, related suggestions are put forward for the comprehensive utilization of rare earth resources.

     

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