GB637578A - Methods for extracting alumina from raw anhydrous calcium aluminates - Google Patents
Methods for extracting alumina from raw anhydrous calcium aluminatesInfo
- Publication number
- GB637578A GB637578A GB25879/46A GB2587946A GB637578A GB 637578 A GB637578 A GB 637578A GB 25879/46 A GB25879/46 A GB 25879/46A GB 2587946 A GB2587946 A GB 2587946A GB 637578 A GB637578 A GB 637578A
- Authority
- GB
- United Kingdom
- Prior art keywords
- solution
- raw material
- alumina
- lime
- treated
- 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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/12—Alkali metal aluminates from alkaline-earth metal aluminates
Abstract
In extracting alumina from anhydrous raw calcium aluminates with dilute alkali carbonates, the raw material is treated in one or more stages with a leaching solution at a high "Attack Ratio" (i.e. the ratio of the molecules of sodium carbonate per litre of solution to the molecules of alumina, in the solid raw material to be treated, per litre of solution) and the resulting solution is enriched and purified by at least one leaching operation at lower "Attack Ratio" during which fresh raw material is added and stirred into the solution, the residue from the operation being thereafter subjected to a high "Attack Ratio" treatment with fresh solution and so on; the enriched and purified solution being treated in known manner for the production of alumina. The process is preferably carried out at 50 DEG to 60 DEG C. Two grades of raw material may be used, the lower grade material serving principally for leaching at high "Attack Ratio," and the other for enriching and purifying the leaching liquors. In one modification, the residues are not immediately separated but are allowed to collect from successive operations and suitable amounts are removed regularly when a selected amount of residue has accumulated. By regulating the conditions, such as the charge of raw material, "Attack Ratio," time and temperature of solution, solutions may be obtained which contain at the end of the operation: (a) no sodium carbonate and no lime in solution, or (b) lime in solution, in which case the lime is precipitated by addition of sodium carbonate leaving a solution of sodium aluminate from which pure alumina may be obtained, or if the lime is present in small amount, the solution may be treated with excess carbon dioxide.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR637578X | 1942-05-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB637578A true GB637578A (en) | 1950-05-24 |
Family
ID=8995385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB25879/46A Expired GB637578A (en) | 1942-05-06 | 1946-08-28 | Methods for extracting alumina from raw anhydrous calcium aluminates |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB637578A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2701752A (en) * | 1951-12-19 | 1955-02-08 | Kaiser Aluminium Chem Corp | Process for the production of alumina |
US2701751A (en) * | 1949-08-11 | 1955-02-08 | Kaiser Aluminium Chem Corp | Process for production of alumina |
US2859100A (en) * | 1953-07-09 | 1958-11-04 | Seailles Jean Charles | Process of extracting alumina from raw calcium aluminates |
US2889217A (en) * | 1954-04-12 | 1959-06-02 | Int Minerals & Chem Corp | Process for producing defluorinated phosphate material |
-
1946
- 1946-08-28 GB GB25879/46A patent/GB637578A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2701751A (en) * | 1949-08-11 | 1955-02-08 | Kaiser Aluminium Chem Corp | Process for production of alumina |
US2701752A (en) * | 1951-12-19 | 1955-02-08 | Kaiser Aluminium Chem Corp | Process for the production of alumina |
US2859100A (en) * | 1953-07-09 | 1958-11-04 | Seailles Jean Charles | Process of extracting alumina from raw calcium aluminates |
US2889217A (en) * | 1954-04-12 | 1959-06-02 | Int Minerals & Chem Corp | Process for producing defluorinated phosphate material |
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