C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/411, 23/88
C01F 7/74 (2006.01) B01J 8/20 (2006.01)
Patent
CA 1328980
ABSTRACT OF THE DISCLOSURE The present invention relates to a method for continuous synthesis of an aqueous aluminum sulfate solution from aluminum sludge comprising the steps of feeding, in turn, the aluminum sludge arising in an aluminum surface treatment process, waste sulfuric acid arising during the removal step of coat in the process and an aluminum sulfuric acid solution arising during the recovery step of sulfuric acid in the process into a plurality of reaction tanks one by one so as to make reaction of those in the tanks, respectively, while mixing, stirring and heating at the temperature of 80°C to the boiling point of the reaction solution, and feeding part of the aluminum sulfuric acid solution into at least one of the second to the last tanks to adjust the pH value of the reaction solution in the last tank at a level in the range of 1.6 to 2.5, and to an apparatus for effecting the method.
551675
Gowling Lafleur Henderson Llp
Ykk Corporation
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