The rare-earth elements (REE), which encompass the fifteen metallic elements of the lanthanoid series of the periodic table, yttrium and occasionally scandium, have gained enormous public, economic and scientific attention in recent years. These elements, which have been found in over 250 minerals, are of high economic and strategic importance to many high-technology industries. As such they have been designated as critical materials by several countries and many new deposits are being developed. Rare-earth mineral (REM) deposits can be broadly classified into four geological environments: carbonates, alkaline/peralkaline igneous rocks, placers and ion adsorption clays. Apart from ion adsorption clay deposits, which require no mineral processing steps, froth flotation is the most applied beneficiation technique. This paper reviews the flotation of REM, covering their surface chemical properties as well as the various flotation reagents which have been employed.

中文翻译：

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稀土矿物浮选试剂的综述。

稀土元素（REE）包含元素周期表中镧系元素的15种金属元素，钇和偶尔的scan，近年来受到了公众，经济和科学的广泛关注。这些元素已在250多种矿物中发现，对许多高科技行业具有重要的经济和战略意义。因此，它们已被多个国家指定为关键材料，并且正在开发许多新矿床。稀土矿床（REM）矿床大致可分为四个地质环境：碳酸盐岩，碱性/高碱性火成岩，砂矿和离子吸附粘土。除不需要矿物加工步骤的离子吸附粘土沉积外，泡沫浮选是最常用的选矿技术。