Process for producing coarse grains of aluminium hydroxide

Details Process for producing coarse grains of aluminium hydroxide Process for producing coarse grains of aluminium hydroxide

C - Chemistry, Metallurgy

01

F

23/250

C01F 7/02 (2006.01) C01F 7/14 (2006.01)

Patent

CA 1148724

ABSTRACT OF THE DISCLOSURE Coarse grains of aluminum hydroxide is economically produced in a high yield from sodium aluminate solution by dividing supersaturated sodium aluminate solution being prepared by Bayer process and having a molar ratio of Na20 as caustic soda to A1203 in solution of less than 1.8 into two streams, adding a portion of recycle seed aluminum hydroxide and fine grains of aluminum hydroxide as seed to one of the streams of sodium aluminate solution, partially decomposing the sodium aluminate solution until the molar ratio of the sodium solution reaches 1.8 - 2.6, adding to the resulting partially decomposed sodium aluminate slurry the other stream of sodium aluminate solution, which has been cooled to a temperature low enough to lower the temperature of the partially decompos- ed sodium aluminate slurry by at least 3°C, and the remaining portion of recycle seed aluminum hydroxide, and then further decomposing the cooled and mixed sodium aluminate slurry until the molar ratio of the sodium aluminate slurry reaches 2.6 - 4Ø The resulting coarse grains of aluminum hydroxide has a high resistance to disintegration to fine powder when calcined.

357815

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