WO2005077830A1 - Treatment of alkaline bayer process residues - Google Patents
Treatment of alkaline bayer process residues Download PDFInfo
- Publication number
- WO2005077830A1 WO2005077830A1 PCT/AU2005/000182 AU2005000182W WO2005077830A1 WO 2005077830 A1 WO2005077830 A1 WO 2005077830A1 AU 2005000182 W AU2005000182 W AU 2005000182W WO 2005077830 A1 WO2005077830 A1 WO 2005077830A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- flue gas
- solution
- contacting
- bicarbonate solution
- bayer process
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
- C01F7/066—Treatment of the separated residue
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a method for the treatment of residues from the Bayer process. More particularly, the present invention relates to a method for decreasing the pH of alkaline Bayer process residues to render such more suitable for disposal. In one form, the present invention also provides a means for the concomitant treatment of flue gases.
- the Bayer process is widely used for the production of alumina from alumina containing ores, such as bauxite.
- the process involves contacting alumina- containing ores with recycled caustic aluminate solutions, at elevated temperatures, in a process commonly referred to as digestion.
- Aluminate solution is separated from the resulting slurry and cooled.
- the entrained alkaline solution in the residual slurry contains caustic soda and other soluble compounds resulting from the reaction of the caustic soda with bauxite ore (such as a range of sodium-organic species and dissolved alumina) and also from reaction with air (such as sodium carbonate). Whilst the vast majority of the aluminate solution is removed prior to disposal of the solids, the remaining solution entrained in the residual solids, and the resulting elevated pH, causes difficulties for disposal.
- Carbonation has been shown to be an effective means treating residual slurry to reduce its pH and hence the hazardous nature of the residue normally attributed to the high pH and corrosivity of the entrained liquor. Carbonation is the addition of gaseous CO 2 to a residue slurry prior to the deposition of this slurry into a residue storage area.
- a bicarbonate solution is a readily produced form of acidity that obviates the need for the elaborate gas-slurry contacting systems necessary for anything other than concentrated carbon dioxide streams.
- the bicarbonate solution may be generated by any means.
- one advantage of the invention is that the bicarbonate solution may be generated from a gas stream of relatively low carbon dioxide concentration and may be contacted with the Bayer process residue without the need for elaborate gas-slurry contactor apparatus, which are prone to scaling.
- the solution is a carbonate solution.
- the solution is a sodium carbonate solution.
- the reaction of the carbon dioxide with the sodium carbonate solution to form sodium bicarbonate may be represented as follows:
- NaOH + NaHC0 3 Na 2 C0 3 + H 2 0 3Ca(OH) 2 .2AI(OH) 3 + 6NaHC0 3 ⁇ 3CaC0 3 + AI 2 O 3 .3H 2 0 + 3Na 2 C0 3 + 6H 2 0
- the bicarbonate solution is formed by the step of:
- the gaseous stream may be provided in the form of flue gas.
- the step of cooling the flue gas prior to contacting such with the solution enables more efficient conversion to bicarbonate, with efficiencies diminishing at elevated temperatures.
- Flue gas typically contains particulates, odour forming compounds, sulfurous compounds and volatile organic carbon compounds.
- the use of flue gas as the gaseous stream affords the further advantage of reducing the quantities of particulates, odour forming compounds, sulfurous compounds and volatile organic carbon compounds from at least a portion of the flue gas.
- the present invention also provides a means for the concomitant treatment of flue gases.
- Carbonation of residue using a bicarbonate solution in the particular embodiment where the bicarbonate solution is generated using flue gas provides the additional benefit of providing a sink for the C0 2 which reduces the atmospheric emission of C0 2 (and other substances) in the flue gas.
- the method may comprise the step of: Thickening the alkaline Bayer process residue.
- the alkaline Bayer process residue produced by the digestion process contains significant levels of soda and alumina. Thickening the alkaline Bayer process residue reduces soda and alumina levels.
- the method comprises the step of: Recovering a carbonate solution.
- the step of contacting the alkaline Bayer process residue with a bicarbonate solution is performed in a reaction vessel having an overflow and an underflow
- the step of recovering a carbonate solution comprises the step of: Recovering the carbonate solution as an overflow from the reaction vessel.
- the recovered carbonate solution is low in alumina, the dissolved alumina having largely precipitated once the alkaline Bayer process residue is contacted with the bicarbonate solution.
- the low alumina levels substantially reduce scaling issues in any apparatus by which the recovered carbonate solution is contacted with carbon dioxide.
- a gaseous stream containing carbon dioxide in the form of hot flue gas 10 is introduced into a gas-liquid contactor 12.
- the hot flue gas 10 is first contacted with a cold water stream 14, and thus cooled and dehumidified.
- the cooled and dehumidified flue gas is then contacted with a carbonate solution 16, thereby generating a bicarbonate solution 18 of pH of approximately 7.5-8.
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0506808-8A BRPI0506808A (en) | 2004-02-16 | 2005-02-11 | treatment of alkaline waste from the bayer process |
CA2556439A CA2556439C (en) | 2004-02-16 | 2005-02-11 | Treatment of alkaline bayer process residues |
AU2005212380A AU2005212380B2 (en) | 2004-02-16 | 2005-02-11 | Treatment of alkaline bayer process residues |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2004900721 | 2004-02-16 | ||
AU2004900721A AU2004900721A0 (en) | 2004-02-16 | Treatment of Alkaline Bayer Process Residues |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005077830A1 true WO2005077830A1 (en) | 2005-08-25 |
Family
ID=34842351
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2005/000182 WO2005077830A1 (en) | 2004-02-16 | 2005-02-11 | Treatment of alkaline bayer process residues |
Country Status (3)
Country | Link |
---|---|
BR (1) | BRPI0506808A (en) |
CA (1) | CA2556439C (en) |
WO (1) | WO2005077830A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008034196A1 (en) * | 2006-09-22 | 2008-03-27 | Alcoa Of Australia Limited | Method of concentrating a bayer process liquor |
WO2009114910A1 (en) * | 2008-03-18 | 2009-09-24 | Alcoa Of Australia Limited | Method of concentrating a bayer process liquor |
CN105399118A (en) * | 2015-11-27 | 2016-03-16 | 中国铝业股份有限公司 | Production method for alumina through sintering method |
US11535790B2 (en) | 2020-09-04 | 2022-12-27 | Saudi Arabian Oil Company | Multivalent iron bio-inhibitor from waste bauxite residue to control reservoir souring |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2994582A (en) * | 1956-07-16 | 1961-08-01 | Kaiser Aluminium Chem Corp | Production of cryolite |
DE2905203A1 (en) * | 1978-02-13 | 1979-08-16 | Mizusawa Industrial Chem | METHOD FOR TREATMENT OF BAUXIT O.AE. RAW MATERIAL |
US4468375A (en) * | 1982-09-27 | 1984-08-28 | Aluminum Company Of America | Production of alumina from aluminum-containing mineral ores with sodium bicarbonate |
WO1993016003A1 (en) * | 1992-02-06 | 1993-08-19 | Alcoa Of Australia Limited | Process for the treatment of red mud |
JPH06107414A (en) * | 1992-09-24 | 1994-04-19 | Earth Chem Corp Ltd | Production of high purity alumina |
DE10119685A1 (en) * | 2001-04-20 | 2002-10-24 | Stockhausen Chem Fab Gmbh | Removing water-insolubles from aqueous metal solution, e.g. in production of aluminum oxide by the Bayer process, involves adding water-soluble cationic polyelectrolyte based on dimethylaminopropyl-acrylamide |
-
2005
- 2005-02-11 CA CA2556439A patent/CA2556439C/en not_active Expired - Fee Related
- 2005-02-11 BR BRPI0506808-8A patent/BRPI0506808A/en not_active Application Discontinuation
- 2005-02-11 WO PCT/AU2005/000182 patent/WO2005077830A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2994582A (en) * | 1956-07-16 | 1961-08-01 | Kaiser Aluminium Chem Corp | Production of cryolite |
DE2905203A1 (en) * | 1978-02-13 | 1979-08-16 | Mizusawa Industrial Chem | METHOD FOR TREATMENT OF BAUXIT O.AE. RAW MATERIAL |
US4468375A (en) * | 1982-09-27 | 1984-08-28 | Aluminum Company Of America | Production of alumina from aluminum-containing mineral ores with sodium bicarbonate |
WO1993016003A1 (en) * | 1992-02-06 | 1993-08-19 | Alcoa Of Australia Limited | Process for the treatment of red mud |
JPH06107414A (en) * | 1992-09-24 | 1994-04-19 | Earth Chem Corp Ltd | Production of high purity alumina |
DE10119685A1 (en) * | 2001-04-20 | 2002-10-24 | Stockhausen Chem Fab Gmbh | Removing water-insolubles from aqueous metal solution, e.g. in production of aluminum oxide by the Bayer process, involves adding water-soluble cationic polyelectrolyte based on dimethylaminopropyl-acrylamide |
Non-Patent Citations (3)
Title |
---|
DATABASE WPI Week 197934, Derwent World Patents Index; Class M25, AN 1979-61759B * |
DATABASE WPI Week 199420, Derwent World Patents Index; Class E33, AN 1994-163732 * |
DATABASE WPI Week 200307, Derwent World Patents Index; Class A97, AN 2003-068832 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008034196A1 (en) * | 2006-09-22 | 2008-03-27 | Alcoa Of Australia Limited | Method of concentrating a bayer process liquor |
AU2007299598B2 (en) * | 2006-09-22 | 2010-11-18 | Alcoa Of Australia Limited | Method of concentrating a Bayer process liquor |
CN101563137B (en) * | 2006-09-22 | 2014-03-26 | 阿尔科澳大利亚有限公司 | Method of concentrating a bayer process liquor |
WO2009114910A1 (en) * | 2008-03-18 | 2009-09-24 | Alcoa Of Australia Limited | Method of concentrating a bayer process liquor |
CN102015048A (en) * | 2008-03-18 | 2011-04-13 | 美铝澳大利亚有限公司 | Method of concentrating a bayer process liquor |
CN105399118A (en) * | 2015-11-27 | 2016-03-16 | 中国铝业股份有限公司 | Production method for alumina through sintering method |
US11535790B2 (en) | 2020-09-04 | 2022-12-27 | Saudi Arabian Oil Company | Multivalent iron bio-inhibitor from waste bauxite residue to control reservoir souring |
Also Published As
Publication number | Publication date |
---|---|
CA2556439A1 (en) | 2005-08-25 |
CA2556439C (en) | 2011-12-13 |
BRPI0506808A (en) | 2007-05-29 |
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