Abstract
The recovery of caustic soda and aluminum from spent bath or waste streams has been investigated in different works. Aluminum removal through sodium aluminate hydrolysis, the transformation of sodium aluminate into aluminum hydroxide (or alumina tri-hydrate), is one of the most common processes.1-4 Crystallization of Al(OH)^sub 3^ from the aluminate solution was intensively investigated.5-14 The process consisted of three stages: nucleation, crystal growth, and agglomeration.