More complete desilication of aluminate solution is the key-factor to radical improvement of alumina refining
A conventional aluminate solution obtained in the Bayer process is characterized by an Al{sub 2}O{sub 3}:SiO{sub 2} (mass) ratio of about 300--350:1. This ratio level is sufficient to produce of alumina low in SiO{sub 2} because silicon during the Al(OH){sub 3} precipitation remains in a spent (mother) liquor. However, there are important reasons to believe that the rise in the rate of aluminum hydroxide precipitation and, consequently, Al{sub 2}O{sub 3} yield are limited by excessive SiO{sub 2} concentration. Moreover, a sodium desilication product formed during heating and evaporation of the spent liquor fouls heat exchanger surfaces. From the aforesaid, it might be assumed that more complete desilication of aluminate solution is a method for radically improving the Bayer process. It is known the technology used in the sintering process that provides increasing the Al{sub 2}O{sub 3}:SiO{sub 2} (mass) ratio in solution to 1,000:1 and more. This method can be applied to the Bayer process with some modifications. As a result the great improvements of the Bayer process parameters are expected.
- OSTI ID:
- 371940
- Report Number(s):
- CONF-960202-; ISBN 0-87339-312-0; TRN: IM9641%%17
- Resource Relation:
- Conference: Annual meeting and exhibition of the Minerals, Metals and Materials Society (TMS), Anaheim, CA (United States), 4-8 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Light metals 1996; Hale, W. [ed.] [Anglesey Aluminum Metal Ltd., North Wales (United Kingdom)]; PB: 1304 p.
- Country of Publication:
- United States
- Language:
- English
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