1, light rare earths usually refers to lanthanum, cerium, praseodymium, neodymium, promethium, samarium and europium seven rare earth elements (there is also a division of lanthanum, cerium, praseodymium and neodymium) of the general term. Also known as cerium group rare earths. They have lower atomic numbers and smaller masses. Since the discovery of the first rare earth element in the early 18th century, the rare earth industry has a history of more than two centuries, and its applications have become increasingly widespread. Nowadays, rare earths play a great role in metallurgy, ceramics, chemical industry, electronics, medical treatment, superconductivity and other fields. Light rare earths, with their high content and wide range of applications, play a pivotal role in the application of rare earths. China's rare earth reserves ranked first in the world, rare earth mines throughout the north and south of the Yangtze River, the ion adsorption rare earth mines in the south and the north of cerium fluorocarbon in the light rare earth content are very high.
2, heavy rare earths because of its wide range of steel, glass, ceramics, electronics, petroleum and other industries, known as "industrial monosodium glutamate".
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