Manufacture of lightweight aggregate
Abstract
Abstract LIGHTWEIGHT AGGREGATE IS MANUFACTURED BY PELLETIZING FLY ASH. A BINDER IS USED COMPRISING AN OIL IN WATER EMULSION WITH EMULSIFYING AGENT. HEAVY FUEL OIL IS PREFERRED AND MOLASSES CAN BE ADDED. EMULSIFYING AGENT IS A CATIONIC AMINE WITH AN ACID. THE OUTER SURFACE OF THE PELLETS IS PREFERABLY SPRAYED WITH FUEL OIL BEFORE SUBJECTING TO HEAT TREATMENT. ALUMINA CONTENT IS SUPPLEMENTED TO AT LEAST 20%, SILICA CONTENT TO AT LEAST 40%, CARBON CONTENT TO AT LEAST 5%, IRON OXIDE CONTENT TO AT LEAST 3%, TO FORM MULLITE AT ELEVATED TEMPERATURE. HEAT TREATMENT PREFERABLY INCLUDES AN INITIAL STAGE WHEN CARBON IS BURNT, A SECOND STAGE WHEN SINTERING OCCURS WITH FORMATION OF MULLITE AND A THIRD STAGE WHEN STRESS RELIEVING OCCURS.
Inventors
- 👤 Ely Koning
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |