CA2000832A1 - Process for producing alumina from gibbsitic bauxites - Google Patents
Process for producing alumina from gibbsitic bauxitesInfo
- Publication number
- CA2000832A1 CA2000832A1 CA2000832A CA2000832A CA2000832A1 CA 2000832 A1 CA2000832 A1 CA 2000832A1 CA 2000832 A CA2000832 A CA 2000832A CA 2000832 A CA2000832 A CA 2000832A CA 2000832 A1 CA2000832 A1 CA 2000832A1
- Authority
- CA
- Canada
- Prior art keywords
- alumina
- bauxites
- liquor
- sodium
- digestion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title abstract 7
- 238000000034 method Methods 0.000 title abstract 6
- 230000029087 digestion Effects 0.000 abstract 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract 2
- 239000002002 slurry Substances 0.000 abstract 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 abstract 1
- 238000013019 agitation Methods 0.000 abstract 1
- 229910001570 bauxite Inorganic materials 0.000 abstract 1
- 238000001354 calcination Methods 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 238000007865 diluting Methods 0.000 abstract 1
- XGZRAKBCYZIBKP-UHFFFAOYSA-L disodium;dihydroxide Chemical compound [OH-].[OH-].[Na+].[Na+] XGZRAKBCYZIBKP-UHFFFAOYSA-L 0.000 abstract 1
- 229910001679 gibbsite Inorganic materials 0.000 abstract 1
- 239000007791 liquid phase Substances 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 239000002244 precipitate Substances 0.000 abstract 1
- 230000001376 precipitating effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052708 sodium Inorganic materials 0.000 abstract 1
- 239000011734 sodium Substances 0.000 abstract 1
- 229910001388 sodium aluminate Inorganic materials 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
Classifications
-
- 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
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
PROCESS FOR PRODUCING ALUMINA FROM GIBBSITIC BAUXITES
ABSTRACT
An improvement in the process for extracting alumina from gibositic bauxitesl wherein the basic, known process comprises mixing the bauxites with a sodium hydroxide-sodium aluminate digestion liquor, digesting the bauxites at a temperature in the range of 100-180 °C, diluting the resulting slurry, separating the red mud therefrom, precipitating alumina hydrate through cooling and agitation of the sodium aluminte liquor, and calcining the alumina hydrate precipitate to obtain alumina, wherein the improvement characterized by so controlling the process that, in the liquid phase of the slurry leaving the digestion reactor, the reactive hydroxide ion concentration is maintained below 6 g/l, and preferably between 0 and 2 g/l, where the reactive hydroxide ion concentration is defined by the following formula:
where is the equilibrium solubility of Al2O3 for gibbsite, in g/l, cAl2O3 is the actual concentration of Al2O0, in g/l and CSiO2 is the actual concentration of SiO2, in g/l.
Desirably, control of the process is maintained by regulating the ratio of bauxite to digestion liquor.
ABSTRACT
An improvement in the process for extracting alumina from gibositic bauxitesl wherein the basic, known process comprises mixing the bauxites with a sodium hydroxide-sodium aluminate digestion liquor, digesting the bauxites at a temperature in the range of 100-180 °C, diluting the resulting slurry, separating the red mud therefrom, precipitating alumina hydrate through cooling and agitation of the sodium aluminte liquor, and calcining the alumina hydrate precipitate to obtain alumina, wherein the improvement characterized by so controlling the process that, in the liquid phase of the slurry leaving the digestion reactor, the reactive hydroxide ion concentration is maintained below 6 g/l, and preferably between 0 and 2 g/l, where the reactive hydroxide ion concentration is defined by the following formula:
where is the equilibrium solubility of Al2O3 for gibbsite, in g/l, cAl2O3 is the actual concentration of Al2O0, in g/l and CSiO2 is the actual concentration of SiO2, in g/l.
Desirably, control of the process is maintained by regulating the ratio of bauxite to digestion liquor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| HU885601A HU201276B (en) | 1988-10-27 | 1988-10-27 | Process for producing alum earth from bauxite containing gibbsite |
| HU5601/88 | 1988-10-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2000832A1 true CA2000832A1 (en) | 1990-04-27 |
| CA2000832C CA2000832C (en) | 1993-05-11 |
Family
ID=10970450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002000832A Expired - Fee Related CA2000832C (en) | 1988-10-27 | 1989-10-17 | Process for producing alumina from gibbsitic bauxites |
Country Status (5)
| Country | Link |
|---|---|
| AU (1) | AU619609B2 (en) |
| BR (1) | BR8905475A (en) |
| CA (1) | CA2000832C (en) |
| ES (1) | ES2019173A6 (en) |
| HU (1) | HU201276B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2226842A1 (en) * | 1995-07-11 | 1997-01-30 | Comalco Aluminium Limited | High yield precipitation process |
| CN1295354C (en) * | 2005-10-19 | 2007-01-17 | 贵阳铝镁设计研究院 | Device for dissolving out aluminium oxide |
-
1988
- 1988-10-27 HU HU885601A patent/HU201276B/en unknown
-
1989
- 1989-10-17 CA CA002000832A patent/CA2000832C/en not_active Expired - Fee Related
- 1989-10-26 BR BR898905475A patent/BR8905475A/en not_active IP Right Cessation
- 1989-10-26 AU AU43731/89A patent/AU619609B2/en not_active Ceased
- 1989-10-27 ES ES8903647A patent/ES2019173A6/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BR8905475A (en) | 1990-05-29 |
| CA2000832C (en) | 1993-05-11 |
| ES2019173A6 (en) | 1991-06-01 |
| AU619609B2 (en) | 1992-01-30 |
| HU201276B (en) | 1990-10-28 |
| AU4373189A (en) | 1990-05-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |