Title of Invention	A PROCESS FOR THE PRODUCTION OF ALUMINA USING THE BAYER PROCESS
Abstract	A process for the production of alumina by the Bayer process includes a precipitation process having an agglo- meration stage and a growth stage. In the agglomeration stage selected process parameter are controlled to limit the bound soda content of the slurry. whilst still maintaining conditions for high yield. In the growth stage. selected process parameters are controlled to control the soda pick-up during growth so that a continuous decrease of soda content is obtained. Preferably the growth stage is divided into a number of separate precipitation vessels and the temperature drop from one precipitator to the next is from 1 to 30c. The temperature of the liquor leaving the final precipitator is prepferably about 550c. The agglomeration stage is preferably operated at 75 -85 c.

Title of Invention

A PROCESS FOR THE PRODUCTION OF ALUMINA USING THE BAYER PROCESS

Abstract

A process for the production of alumina by the Bayer process includes a precipitation process having an agglo- meration stage and a growth stage. In the agglomeration stage selected process parameter are controlled to limit the bound soda content of the slurry. whilst still maintaining conditions for high yield. In the growth stage. selected process parameters are controlled to control the soda pick-up during growth so that a continuous decrease of soda content is obtained. Preferably the growth stage is divided into a number of separate precipitation vessels and the temperature drop from one precipitator to the next is from 1 to 30c. The temperature of the liquor leaving the final precipitator is prepferably about 550c. The agglomeration stage is preferably operated at 75 -85 c.

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Patent Number

181491

Indian Patent Application Number

120/MAS/1993

PG Journal Number

30/2009

Publication Date

24-Jul-2009

Grant Date

25-Jun-1999

Date of Filing

17-Feb-1993

Name of Patentee

M/S. COMALCO ALUMINIUM LIMITED

Applicant Address

55 COLLINS STREET, MELBOURNE, VICTORIA 3000

Inventors:

#	Inventor's Name	Inventor's Address
1	GREGORY PATRICK BROWN	27A BALLINGER ROAD, BUDERIM, QUEENSLAND 4556
2	DAVID GRAHAM WOOD	164 UPPER BROOKFIELD ROAD, BROOKFIELD, QUEENSLAND 4069

PCT International Classification Number

C 01 F 7/02

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	PL0977	1992-02-17	Australia