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近年来,稀有金属作为高技术产业不可缺少的材料引起人们的关注。稀有金属还没有严格的定义,一般说来,凡属以下四项中任一项的金属元素都可称为稀有元素:1.地球上的储量十分稀少。2.地球上储量虽多,但能够提取该金属的具有经济价值的矿石很稀少。3.地球上储量虽多,但很难用化学、物理手段提取纯粹的金属。4.提取出的金属尚无用途,或由于特性尚不明确还未开发。
In recent years, rare metals as a high-tech industry indispensable material aroused people’s attention. Rare metals are not yet strictly defined. Generally speaking, any one of the following four metal elements can be called a rare element: 1. The reserves on Earth are very scarce. 2. There are many reserves on the planet, but the economic value of the metal that can extract the metal is scarce. 3. Although there are many reserves on Earth, it is very difficult to extract pure metals by chemical and physical means. 4. The extracted metal has no use yet, or has not been developed yet due to its unclear properties.