Process for the separation of useful compounds from waste of the aluminum industry
Abstract
Abstract PROCESS FOR THE TREATMENT OF RED-MUD TO EXTRACT FE2O3, AL2O3, SIO2 AND NA2O, IN WHICH SO2 IS PASSED INTO A SOLUTION OF RED-MUD AND THE FE2O3 SEPARATED THEREFROM. THE LIQUOR IS HEATED UNTIL A PH OF 4.5 TO 5.0 IS REACHED FORMING A PRECIPITATE OF SIO2 AND AL(OH)SO3. THE PRECIPITATE IS SEPARATED FROM THE LIQUOR WHICH IS CONCENTRATE TO CRYSTALLIZE OUT NA2SO3. SULPHURIC ACID IS ADDED TO THE SEPARATED PRECIPITATE FORMING WATER-SOLUBLE ALUMINUM SALTS. SIO2 REMAINS AS A RESIDUE AND IS REMOVED FROM SOLUTION. WATER AND A POTASSIUM OR AMMONIUM SALT IS ADDED TO THE LIQUOR FROM WHICH THE CORRESPONDING ALUM MAY BE CRYSTALLIZED OUT. THE PRECIPITATE OF SIO2 MAY BE FURTHER TREATED TO OBTAIN GEL OR WATER GLASS.
Inventors
- 👤 Jui-Hsiung Tsai
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |