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“稀土”指的是化学元素周期表中的一组元素,它由镧(La),铈(Ce),镨(Pr),钕(Nd),钷(Pm),钐(Sm),铕(Eu),钆(Gd),铽(Tb),镝(Dy),钬(Ho),铒(Er),铥(Tu),镱(Yb),镥(Lu),钪(Sc),钇(Y)共17种元素组成。由于它们物理、化学性质相似,并且总是共生伴生在一起,所以人称“稀土17姐妹。”其中又根据某些差异和分离工艺的需要分为轻稀土组,重稀土组或轻、中、重三组。 “稀土”的得名完全是由于历史的原因。18世纪末期,稀土元素才开始陆续被人们发现。当时人们习惯于把不溶于水的固体氧化物称作“土”。比如氧化铝被称
“Rare earth ” refers to a group of elements in the periodic table of the chemical element, which consists of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tu, Yb, Lu, Sc, Yttrium (Y) a total of 17 kinds of elements. Because of their physical and chemical similarities, and always symbiotic together, so called “rare earth 17 sisters.” Which according to some differences and separation process needs are divided into light rare earth group, heavy rare earth group or light, medium , Heavy three groups. “Rare Earth ” was named because of historical reasons. The late 17th century, rare earth elements began to be found one after another. At that time, people used to refer to water-insoluble solid oxides as “earth”. Such as alumina is said