C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/248, 252/40
C01F 7/44 (2006.01) B01J 20/08 (2006.01) C01F 7/02 (2006.01) C04B 35/10 (2006.01)
Patent
CA 1231516
ABSTRACT The invention relates to a process for manufacturing highly active, dispersed aluminum hydroxide, of low apparent den- sity . First, unground, very fine grained aluminum tri-hydroxide, of which more than 99 % of the grains are at most 3 µm in size, is introduced conti- nuously into a reactor along with a stream of hot dry air, is whirled up and strongly dispersed, heated to 400-600°C and shock dehydrated. The low apparent density aluminum oxide flowing out of the reactor in the hot air stream is precipitated out by suitable mechanical means, dispersed in mildly acidic or mildly basic water and rehydrated with the aid of heating. The invention also relates to shaped components of highly active, dispersed low apparent density aluminum oxide ha- ving a specific surface area of at least 200 m2/g, a pore volume of more than 1.2 cm3/g and adequate resistance to fracture and wear. The shaped components are in particular produced by trea- ting low apparent density aluminum oxide with rehydrated grains and extruding as a pliable mass, or by rolling the low apparent density aluminum oxide grains in a cumulative granulation process in which water is added during granu- lation.
490623
Marcoux & Sher Swabey Mitchell Houle
Swiss Aluminium Ltd.
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