Process of producing aluminum fluoride

Details Process of producing aluminum fluoride Process of producing aluminum fluoride

C - Chemistry, Metallurgy

01

B

23/166

C01B 9/08 (2006.01) C01F 7/50 (2006.01)

Patent

CA 1265318

ABSTRACT OF THE DISCLOSURE Producing aluminum fluoride from aluminum hydroxide or alumina hydrate and hydrogen fluoride yields a highly concentrated product and an exhaust gas having a low hydrogen fluoride content when an initial isoling step is introduced. In the process, partly reacted aluminum hydroxide circulated in a cooling cycle is added to fresh aluminum hydroxide or alumina hydrate in a first stage, in which the aluminum hydroxide is contacted with the hydrogen floride-containing exhaust gases from the circulating fluidized bed system so as to form a gas-solids suspension at a temperature of 150 to 250°C. Thereafter, the solids are collected from the gas steam at least part of the collected solids are passed through a cooler, and cooled solids are re-contacted with fresh aluminum hydroxide or alumina hydrate. a partial stream of the collected solids is supplied to the circulating fluidized bed system and is reacted therein at a temperature of at least 450°C, preferably of 500 to 600°C, with hydrogen fluoride supplied in the form of a gas in a concentration up to 25 vol. % .

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