一、前言 从七十年代先后发现离子型重稀土和轻稀土矿床以来,不仅由于它是一类新型而独特的矿物资源,而且它具分布广,储量大配分全、有价元素含量高;放射性低、杂质含量少;易勘探易采冶等特点而受到重视。对于它的开发利用进行了有成效的探讨研究工作。但到七十年代末,由于受生产技术和市场需求方面等的制约,这类矿山的混合稀土氧化物的产量还不多。 I. Introduction Since the discovery of ionic heavy rare earth and light rare earth deposits successively in the 1970s, it is not only because it is a new and unique mineral resource, but also has a wide distribution, a large distribution of reserves, and a high content of valuable elements. Radioactivity Low, less impurity content; easy exploration and mining and other characteristics of attention. For its development and utilization of a fruitful exploration and research work. However, by the late 1970s, due to the constraints of production technology and market demand, the output of mixed rare earth oxides in these mines was still small.