C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/87
C01F 7/74 (2006.01)
Patent
CA 1105674
Abstract A method of crystallizing a solution of aluminium sulphate to form crystal agglomerates having an essentially uniform grain size and being in the form of granules having a characteristic appearance and good storage properties. A solution having a temperature of 105-115°C and a concentration of 14.5 - 16.8% by weight of A1203 is brought to crystallize onto a bed of crystalline aluminium sulphate in a drum, the length of which is condsiderably larger than the diameter, a temperature of 70 - 95°C being maintained in the bed. Part of the crystalline product discharged from the drum is ground and recycled to the drum in an amount of 40 - 200 per cent by weight of added solution and air is passed through the drum to remove moisture evolved by the crystallization so as to form a final product with more than 75 % by weight present in the crystalline state and containing 15.0 - 18.0 % by weight of A1203.
280220
Frang Gosta M.
Schmidt Egon B.
Zechner Josef K.s.
Boliden Aktiebolag
Macrae & Co.
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