GB883311A - Improvements in and relating to the production of alumina - Google Patents
Improvements in and relating to the production of aluminaInfo
- Publication number
- GB883311A GB883311A GB28409/59A GB2840959A GB883311A GB 883311 A GB883311 A GB 883311A GB 28409/59 A GB28409/59 A GB 28409/59A GB 2840959 A GB2840959 A GB 2840959A GB 883311 A GB883311 A GB 883311A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- stage
- alumina
- adjusted
- precipitate
- 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.)
- Expired
Links
Classifications
-
- 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
- C01F7/20—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts
- C01F7/26—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts with sulfuric acids or sulfates
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
<PICT:0883311/III/1> Alumina is obtained from solutions produced by dissolving aluminium-containing materials, for example bauxite, in sulphuric acid by so adjusting the solution that the SO3 : Al2O3 weight ratio is less than 2,35 (which value corresponds to Al2(SO4)3), hydrolysing the adjusted solution at 180 DEG -300 DEG C. to precipitate a basic aluminium sulphate or hydrated alumina, and decomposing this precipitate to leave alumina. The hydrolysis is preferably carried out under pressure. The SO3 : Al2O3 weight ratio in the solution may be adjusted by dissolving aluminium metal in the solution, or by digesting the solution with a source of alumina, for example bauxite, preferably at 100 DEG C. to 140 DEG C., or by electrolysing the solution in a cell provided with a suitable membrane, for example a selective anion exchange membrane, paper, or parchment, thereby removing sulphate ions from the solution in the cathode compartment, or by adding to the solution, which may have been partially adjusted, some of the hydrolysis precipitate from a previous batch or a basic aluminium sulphate from any source. In examples, crushed bauxite is digested with sulphuric acid under pressure in digestion stage 1. If sufficient air or oxygen is provided, at least part of the sulphuric acid may be replaced by pyrite. The liquor from stage 1 is passed to modification stage 2, where the SO3 : AL2O3 ratio is adjusted by any of the methods previously indicated. Any iron in the solution may be reduced to the ferrous state by aluminium metal or other reducing agent. The adjusted liquor is passed to precipitation stage 3, where it is maintained at 180 DEG -300 DEG C. to permit hydrolysis to take place. The precipitate is recovered, and part is recycled to stage 3 and the remainder is calcined in stage 4 to give alumina product and sulphur dioxide, which is passed to digestion stage 1. The liquor from stage 3 is similarly recycled to stage 1.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU883311X | 1958-08-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB883311A true GB883311A (en) | 1961-11-29 |
Family
ID=3763330
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB28409/59A Expired GB883311A (en) | 1958-08-21 | 1959-08-19 | Improvements in and relating to the production of alumina |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB883311A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4177242A (en) * | 1977-02-28 | 1979-12-04 | Aluminum Pechiney | Method of obtaining pure alumina by acid attack on aluminous minerals containing other elements |
US4244928A (en) * | 1978-01-13 | 1981-01-13 | Veb Mansfeld Kombinat William Pieck | Process for the production of pure aluminum oxide |
US6468483B2 (en) | 2000-02-04 | 2002-10-22 | Goldendale Aluminum Company | Process for treating alumina-bearing ores to recover metal values therefrom |
-
1959
- 1959-08-19 GB GB28409/59A patent/GB883311A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4177242A (en) * | 1977-02-28 | 1979-12-04 | Aluminum Pechiney | Method of obtaining pure alumina by acid attack on aluminous minerals containing other elements |
US4244928A (en) * | 1978-01-13 | 1981-01-13 | Veb Mansfeld Kombinat William Pieck | Process for the production of pure aluminum oxide |
US6468483B2 (en) | 2000-02-04 | 2002-10-22 | Goldendale Aluminum Company | Process for treating alumina-bearing ores to recover metal values therefrom |
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