EP 1044164 A4 20020904 - IMPROVEMENTS RELATING TO THE BAYER PROCESS
Title (en)
IMPROVEMENTS RELATING TO THE BAYER PROCESS
Title (de)
VERBESSERUNG DES BAYER PROCESSES
Title (fr)
PERFECTIONNEMENTS SE RAPPORTANT AU PROCEDE BAYER
Publication
Application
Priority
- AU PP084997 A 19971211
- US 9826206 W 19981210
Abstract (en)
[origin: WO9929626A1] The present invention relates to a method for reducing scale in the Bayer process comprising: (a) digesting an aluminous ore in a caustic liquor to extract alumina values; (b) feeding the liquor to a settler tank to clarify the liquor by separating caustic insoluble materials; and (c) precipitating alumina crystals from the clarified liquor, the process further comprising adding a polysaccharide to the feed of the settler in an amount less than 50 ppm, said amount being sufficient to minimize the formation of scale and lengthen the time between descaling operations in comparison with a feed in the absence of polysaccharide. By using the method of the invention it is possible to substantially lengthen the time between descaling operations in some cases by over 100 %.
IPC 1-7
IPC 8 full level
C01F 7/06 (2006.01); C01F 7/0653 (2022.01); C02F 5/10 (2006.01); C22B 21/00 (2006.01)
CPC (source: EP)
C01F 7/0653 (2013.01); C02F 5/10 (2013.01); C22B 21/0007 (2013.01)
Citation (search report)
- [X] EP 0465055 A1 19920108 - NALCO AUSTRALIA PTY LIMITED [AU]
- [X] US 5217620 A 19930608 - MAHONEY ROBERT P [US], et al
- [X] US 5008089 A 19910416 - MOODY GILLIAN M [GB], et al
- [X] US 5091159 A 19920225 - CONNELLY LAWRENCE J [US], et al
- [X] EP 0392779 A1 19901017 - ALLIED COLLOIDS LTD [GB]
- [X] US 3085853 A 19630416 - LESINSKI CHESTER A, et al
- [A] US 4561982 A 19851231 - KURIYAMA YASUHISA [JP], et al
- See references of WO 9929626A1
Designated contracting state (EPC)
IE IT
DOCDB simple family (publication)
WO 9929626 A1 19990617; AU 1813599 A 19990628; AU PP084997 A0 19980108; BR 9813467 A 20001010; EP 1044164 A1 20001018; EP 1044164 A4 20020904
DOCDB simple family (application)
US 9826206 W 19981210; AU 1813599 A 19981210; AU PP084997 A 19971211; BR 9813467 A 19981210; EP 98963023 A 19981210