Patent ID: 8585992
Filing Date: 2013-11-19
Classification: C01F,C02F

Abstract:
1. A method of dewatering of alumina trihydrate precipitated from the Bayer process by addition of a dewatering aid to the Bayer process at a point selected from the group consisting of the trihydrate dewatering step, the filter cake wash water prior to its contacting the filter cake, the alumina trihydrate slurry prior to filtration, and the aluminum trihydrate crystals, said dewatering aid being comprised of: a. at least two surfactants, one of which is a non-ionic surfactant and the other an anionic surfactant, and b. a coupling agent wherein applying said dewatering aid reduces the moisture content of an alumina trihydrate filter cake which is produced by filtering slurry of alumina trihydrate obtained within the Bayer process and adding the dewatering aid to the process.