论文部分内容阅读
一、世界稀土资源世界稀土资源丰富,在地壳内含量比人们熟悉的铅、锌多,远超过金和铂的含量。虽然稀土绝对量很大,但含量较低,在地壳中的平均丰度只为200ppm,分布又很不均匀,目前可供开采具有工业利用价值有轻稀土矿物,主要是氟碳铈矿、独居石、铈铌钙钛矿;重稀土矿物,主要是磷钇矿、褐钇铌矿、离子吸附型稀土矿、钛铀矿等十几种。
First, the world of rare earth resources The world is rich in rare earth resources, content in the crust than people are familiar with lead, zinc and more than gold and platinum content. Although rare earths are abundant, they are low in content, with an average abundance of only 200 ppm in the crust and a very uneven distribution. Currently available for mining are light rare earth minerals with industrial utility, mainly bastnaesite, Stone, cerium and niobium perovskite; heavy rare earth minerals, mainly xenotime ore, brown yttrium niobium ore, ion-adsorption rare earth ore, titanium and other uranium more than a dozen.