Rare earth elements include lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb),lutetium (Lu), scandium (Sc), and yttrium (Y). The English name is Rare Earth. Rare Earth metals are generally soft, malleable, and ductile, and exhibit particularly strong reactivity as powders at high temperatures. This group of metals has extremely strong chemical activity and has strong affinity for hydrogen, carbon, nitrogen, oxygen, sulfur, phosphorus, and halogens. They are easily oxidized in air, and heavy rare earths can form an oxidation protective layer on the surface of scandium and yttrium at room temperature. Therefore, rare earth metals are generally stored in kerosene or in sealed containers filled with vacuum and argon gas. Rare earth elements can be divided into two categories: light rare earth and heavy rare earth, mainly existing in the form of rare earth oxides. China, Russia, the United States, Australia and other countries have the highest reserves of rare earthh resources in the world. Rare earth are mainly used in fields such as petroleum, chemical engineering, metallurgy, textiles, ceramic glass, permanent magnet materials, etc. They are known as “industrial monosodium glutamate”, “industrial vitamins”, and “mother of new materials”, and are precious strategic metal resources.
Post time: Nov-03-2023