Process for the preparation of polyaluminium compounds

Details Process for the preparation of polyaluminium compounds Process for the preparation of polyaluminium compounds

C - Chemistry, Metallurgy

01

F

23/134

C01F 7/56 (2006.01) D21H 19/38 (2006.01)

Patent

CA 2009847

ABSTRACT The present invention relates to a process for the preparation of polyaluminium hydroxychloride complexes having the general formula Al(OH)xCly in solution or in solid form and intended to be used as flocculants and coagulants at water purification, sludge dewatering, plant dewatering and paper production, whe- reby one reacts aluminium chloride in solution with aluminium hydroxide, or aluminiumoxide hydrates at a temperature of 120- 170°C at an elevated pressure for 1.5-5 hrs, whereby the rela- tionship AlCl3:Al(OH)3 is thus adjusted that the relationship OH:Al in the resulting compound Al(OH)xCly becomes 0.5 to 1.5, preferably 0.8 to 1.2.

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