method of producing alumina trihydrate crystals from an alumina trihydrate recovery process stream

摘要

Disclosed herein are methods of producing alumina trihydrate crystals from an alumina trihydrate recovery process stream wherein an aqueous emulsion comprising a crystal growth modifier, which is at least one of an anhydride acyclic or an alkyl or alkenyl succinic anhydride is added to the alumina trihydrate recovery process stream, wherein the aqueous emulsion is substantially free of mineral oils. The method provides a decrease in the percentage of alumina trihydrate crystals having a volume average diameter of less than about 45 micrometers compared to the percentage of alumina trihydrate crystals produced in the absence of the growth modifier. crystals The process does not require the addition of a defoamer / defoaming agent to control the foam generated in the process.