Patent ID: 8048398

Claim:
A process for preparing a mixed metal oxide powder, comprising: evaporating oxidizable starting materials in an evaporation zone of a reactor; oxidizing the starting materials in a vaporous state in an oxidation zone of the reactor to form a reaction mixture; and cooling the reaction mixture after removing reaction and pulverulent solids from gaseous substances, wherein the starting materials comprise: at least one pulverulent metal; and at least one metal compound comprising a metal component that is different from the at least one pulverulent metal, the at least one puverulent metal is at least 80% by weight based on the sum of the at least one pulverulent metal and the metal component of the metal compound, the evaporating comprises feeding the starting materials and at least one combustion gas to the evaporation zone of the reactor to completely evaporate the at least one pulverulent metal and the metal compound under nonoxidizing conditions, the oxidizing comprises reacting a mixture flowing out of the evaporation zone with a stream of a supplied oxygen-containing gas in the oxidization zone of the reactor, and the oxygen-containing gas has an oxygen content at least sufficient to oxidize the starting materials and the at least one combustion gas completely.