Pollution control in phosphate slime disposal
Abstract
Abstract PRESORPTION OF SMALL AMOUNTS OF ANIONIC POLYELECTROLYTE FLOCCULANTS SUCH AS A 35% HYDROLYZED-COONA-POLYACRYLAMIDE OF ABOUT 15 MILLION WEIGHT AVERAGE MOLECULAR WEIGHT ONTO SAND TAILINGS FROM THE PROCESSING OF PHOSPHATE ORE IMPROVES THE SUBSEQUENT SETTING AND SOLIDIFICATION ON MIXING WITH PHOSPHATE SLIMES. THE RATE OF SETTLING, HOMOGENEITY AND FILTERABILITY OF THE SETTLED SLIME-SAND LAYER ARE IMPROVED UNDER MANY CONDITIONS OF SLIME CONCENTRATION, SAND TO SLIME RATIO AND FLOCCULANT TO SLIME RATIO. ANIONIC FLOCCULANTS ARE BETTER THAN NONIONICS OR CATIONICS. FLY ASH CAN BE USED AS A SILICEOUS SUBSTRATE TO REPLACE SAND, AND ALTHOUGH THERE ARE SILILARITIES TO SAND, TO RESPONSE TO THE CATIONIC-ANIONIC CHARACTER OF THE POLYELECTROLYTE IS DIFFERENT.
Inventors
- 👤 Howard Patrick Ledden
- 👤 Klaus Muller
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1975-12-26 | 1976-06-26 | 1976-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-26 | 1980-06-26 | 1980-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-26 | 1984-06-26 | 1984-12-26 | $7700.00 | Window Closed / Lapsed |