Process for the manufacture of coarse aluminum hydroxide

Details Process for the manufacture of coarse aluminum hydroxide Process for the manufacture of coarse aluminum hydroxide

C - Chemistry, Metallurgy

01

F

23/250

C01F 7/02 (2006.01) C01F 7/14 (2006.01)

Patent

CA 1111624

Abstract Process for the manufacture of coarse aluminum hydroxide, con- taining a maximum of 15 weight percent of the particles in a par- ticle size under 45 micrometres, with a productivity that may be higher than 60 grams of precipitated Al203. The process consists of a decomposition in two stages (an agglo- meration phase and a growth phase); each stage proceeding within defined temperature ranges with seed material of different con- stitution. The first (fine) seed amount is added at the start of the decomposition in such an amount, that the ratio of the super- saturation of the aluminate liquor to the surface area of the seed position exhibits a value of 7 to 25 grams per square metre. The process exhibits the advantage of the high productivity of the so- called European process and the advantage of the so-called American process by obtaining a coarse product hydroxide. -1-

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