US3840188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid energy drying and grinding mill
Assignee: EIDP Inc
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Filing: 1973-07-31
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Granted: 1974-10-08
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Expires: 1993-07-31
Abstract
Abstract A fluid energy mill of the confined vortex type is designed to permit the simultaneous drying and grinding of slurries of pulverulent solids, e.g., pigment slurries. The slurry is directed into a passageway leading to the grinding chamber in such a way as to be enveloped and atomized by a flow of gaseous drying fluid, e.g., high pressure steam, of at least sonic velocity. The solids become at least partially dried before entering the grinding chamber but with little or no tendency to adhere to the walls of the passageway leading thereto.
Inventors
- 👤 A Coombe
- 👤 P Muhlmichl
- 👤 R Stuber
- 👤 E Danisavich
- 👤 T Gniewek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:09
CPC Classifications
B; B02; B02C; B02C21/00; B02C19/00; B02C19/06; B02C19/061
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
A fluid energy mill of the confined vortex type for drying and grinding a slurry of pulverulent solids, said mill comprising: a generally circular grinding chamber defined by a pair of opposing axial walls and a peripheral wall, a slurry feed device formed by walls defining a generally rectilinear passageway which opens into a peripheral region of said chamber, a slurry supply conduit having an inlet remote from said passageway and a discharge nozzle positioned in said passageway for directing slurry along the passageway and toward said chamber, the size of discharge nozzle being small relative to the surrounding passageway to define an annular space therebetween, means for supplying gaseous drying fluid of at least sonic velocity to said annular space to thereby envelop and atomize within the passageway slurry emerging from said discharge nozzle, means for controlling the temperature of said discharge nozzle, and discharge means for withdrawing pulverulent solids and gaseous grinding fluid along the axis of the chamber.
Claim 2
Dependent Claim
161 words
A fluid energy mill of the confined vortex type for drying and grinding a slurry of pulverulent solids, said mill comprising: a generally circular grinding chamber defined by a pair of opposing axial walls and a peripheral wall, a slurry feed device formed by walls defining a generally rectilinear passageway which opens into a peripheral region of said chamber, a slurry supply conduit having an inlet remote from said passageway and a discharge nozzle positioned in said passageway for directing slurry along the passageway and toward said chamber, the size of discharge nozzle being small relative to the surrounding passageway to define an annular space therebetween, means for supplying gaseous drying fluid of at least sonic velocity to said annular space to thereby envelop and atomize within the passageway slurry emerging from said discharge nozzle, means for controlling the temperature of said discharge nozzle, and discharge means for withdrawing pulverulent solids and gaseous grinding fluid along the axis of the chamber.
Claim 3
Dependent Claim
22 words
Mill according to claim 1 wherein the passageway of said slurry feed device opens into the peripheral wall of said grinding chamber.
Claim 4
Dependent Claim
24 words
Mill according to claim 1 wherein the passageway of said slurry feed device opens generally tangentially into the peripheral wall of said grinding chamber.
Claim 5
Dependent Claim
35 words
Mill according to claim 1 wherein the means for controlling the temperature of the discharge nozzle comprises a channel inside the walls of the slurry supply conduit for flow of a heat exchange medium therethrough.
Claim 6
Dependent Claim
19 words
Mill according to claim 1 wherein the discharge nozzle forms a converging-diverging nozzle with the adjacent portion the passageway.
References 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) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |