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稀土元素是指La、Ce、Pr、Nd、Pm、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu和Y、Sc,共17种元素。由于人们习惯于将不溶于水的固体氧化物称为“土”,而稀土元素的氧化物又多呈土状,不溶于水,同时这些元素在地壳中的含量较少,且分散难于提取,故人们称之为稀土元素。稀土,实际上是一种典型金属。具有独特的物理化学性质,如:催化性、光学性、磁性、抗性等。因此,它在有色冶金、石油加工、耐火材料、硅酸盐工业、玻璃工业、医药、农业以及原子能、火箭、超导等技术上得到广泛应用,故人们将稀土称为“现代工业的味精”。近年来,稀土资源的开发应用领域不断拓宽,已从工业上的应用延伸到医疗保健、农牧业等领域中,因它
The rare earth elements are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y, Sc. Because people are accustomed to the water-insoluble solid oxide called “soil”, and the rare earth oxides and more earthy, insoluble in water, at the same time these elements in the crust of the content is less, and the dispersion is difficult to extract, So people call it REE. Rare earth, is actually a typical metal. Has a unique physicochemical properties, such as: catalytic, optical, magnetic, resistance and so on. Therefore, it is widely used in the fields of nonferrous metallurgy, petroleum processing, refractory materials, silicate industry, glass industry, medicine, agriculture and atomic energy, rockets and superconducting technologies. Therefore, rare earths are called “modern industrial MSG” . In recent years, rare earth resources continue to broaden the field of development and application, has extended from the industrial application of health care, agriculture and animal husbandry and other fields, because it