Dense phase precipitation

Details Dense phase precipitation Dense phase precipitation

C - Chemistry, Metallurgy

01

F

23/250

C01F 7/06 (2006.01) C01F 7/14 (2006.01)

Patent

CA 1117274

Abstract of the Disclosure A system for the precipitation of Al(OH)3 from green liquor is provided which comprises process and apparatus for feeding the green liquor into the bottom of a chamber containing a supersaturated solution of alumina trihydrate and seed particles. The flow of green liquor into the bottom of the chamber is main- tained at a rate sufficient to suspend the seed particles in the chamber with minimum turbulence so that the liquor is in approxi- mately plug flow. As Al(OH)3 precipitates on the seed particles, the particles grow larger and gradually move to the bottom of the chamber where they are removed. The solution, depleted with respect to Al2O3, overflows the chamber to return to the process.

342622

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