Method for producing a pure cerium oxide
AssigneeTreibacher Chemische Werke Aktiengesellschaft
InventorLeo Hafner
Life of this patent
Estimating the term…
Abstract
The brightness of a cerium oxide is improved by adding a boron compound to a cerium salt or a mixture of cerium salts, and the calcining the mixture in the presence of air in a conventional manner.
Claims8
A method of improving the brightness of a cerium oxide, comprising the steps of adding a boron compound to a cerium salt or a mixture of cerium salts selected from the group consisting of cerium oxalate, cerium carbonate and cerium oxide hydrate, and then calcining the mixture in the presence of air, the boron compound being capable of producing B.sub.2 O.sub.3 on calcining and being added in an amount to provide, calculated as B.sub.2 O.sub.3, 0.05% to 5%, by weight, of the boron compound, based on the weight of cerium oxide.
Dependencies are inferred from the claim text.