Knowledge of Cerium Oxide Rare Earth

What is Cerium Oxide?

Cerium oxide powder is a kind of yellowish or tawny powder. Its density is 7.13g/cm3, melting point is 2397 ℃. It is insoluble in water and alkali, but slightly soluble in acid. Under the temperature of 2000 ℃ and pressure of 15Mpa, we can use hydrogen to restore cerium oxide and obtain cerium oxide. When the temperature is freely between 2000 ℃ and the pressure is under 5Mpa, cerium oxide is yellowish and reddish, and maybe pink, its performance is to used as polishing material. But it is mainly used as glass decolorizing agent, glass polishing powder, and it is also the preparation of a raw material of cerium metal, the high-purity cerium oxide is also used for the production of rare earth luminescent material. Insoluble in water, but soluble in strong mineral acid. Bleaching, it is not only used as clarifying agent for glass, advanced polishing powder, but also used for the ceramic electrical, chemical and other industries.

Development History of Cerium Oxide Powder

With the development of rare earth industry in the 1930s, first in Europe the rare earth oxide was used as polishing powder for glass polishing. In World War II, the rare earth polishing powder soon succeed in polishing precision optical instruments. In foreign country, the production of rare earth polishing powder began 60 years ago, and in 1990s, it has formed a variety of standardized series of more than 30 kinds of products. Currently, the major domestic brands Chute brand are cerium oxide powder and arrogant beauty brand cerium oxide polishing powder. There are 15 foreign rare earth polishing powder manufacturers (annual production capacity is 200 tons or more. The annual production capacity of France Rhodia is over 2200 tons, it is the world's largest rare earth polishing powder manufacturer. In 1968, China's first successful development of rare earth polishing powder chemical plant is in Shanghai. At present, the cerium oxide manufacturer in China is more than 14 (the annual production capacity is more than 30 tons), but compared with foreign countries, there is still a big gap.

Applications of Cerium Oxide Powder

Cerium rare earth polishing powder has the better chemical and physical properties, so it has a wide range of applications in the industrial products polishing, such as in a variety of optical glass device, TV kinescope, optical lens, CRT, flat glass polishing of semiconductor wafers and metal precision products such as. Ceric rare earth polishing powder is mainly applied in high-speed precision optical lens polishing. Of the cerium rare earth polishing powder, high-speed optical instrument is mainly applied to the polishing of moderate precision small and medium-sized spherical lens. Domestic use polishing powder dosage still need to be to continue to develop new uses in the future. Low cerium oxide rare earth polishing powder is suitable for the polishing of TV picture tubes, spectacle lenses and flat glass. So the cerium oxide producer aims at the high-rapid glass processing industry to seize development opportunity.

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