稀土金属是指镧系的15个元素及钪、钇两种元素,这些元素在自然界密切共生,理化性质非常相似。它们通常被人们分成两组:即包括镧、铈、镨、钕、钐、铕、钆、钜的铈组稀土(亦称轻稀土),和包括钇、钪、铽、镝、钬、铒、铥、镱、镥的钇组稀土(也称重稀土)。由于我国的稀土资源丰富, Rare-earth metals refers to the lanthanide 15 elements and scandium, yttrium two kinds of elements, these elements are closely intergrowth in nature, physical and chemical properties are very similar. They are usually divided into two groups: a group of cerium rare earths (also known as light rare earths) including lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium, gadolinium and rare earths including yttrium, scandium, terbium, dysprosium,铥, ytterbium, 镥 yttrium group rare earth (also called rare earth). Due to the rich rare earth resources in our country,