US3862294A
Expired / Lapsed
US
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Method for flash calcining inorganic materials
Assignee: Individual
•
Filing: 1972-04-10
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Granted: 1975-01-21
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Expires: 1992-04-10
Abstract
Abstract Naturally occurring or man-produced inorganic minerals and materials, such as limestone, dolomite, magnesite, hydromagnesite, brucite, to name a few of the most important, are subjected to a process which involves the decomposition of the solids material with release of gaseous compounds and reduction of the material to the oxide on a continuous basis at a minimal retention time utilizing co-current contact of the inorganic solids with the gaseous heat source to produce a highly pure and active oxide of the mineral or material without the use of mechanically motivated parts or mechanisms in the unit as compared to current methods and means known in this art.
Inventors
- 👤 Donald Spencer Engelhart
- 👤 Ned Henry Engelhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:25
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/02; C01F11/04; C01F5/00; C01F5/02; C01F5/06; C04; C04B; C04B2/00; C04B2/10; C04B2/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
43 words
The method of claim 1 wherein the stream of gases and entrained solids is separated into a stream of subdivided solid particles and a stream of carrying gas, and transfering heat from the stream of finely divided compound back to the combustion zone.
Claim 2
Dependent Claim
44 words
The method of claim 1 wherein the current of gases and entrained solid compound is separated into a stream of subdivided solid compound and a stream of gas, and transfering heat from the stream of subdivided compound to the gases in the combustion zone.
Claim 3
Dependent Claim
107 words
Method of thermal decomposition of a solid inorganic compound in particulate form into a solid decomposition product and a gaseous decomposition product which comprises establishing a high temperature fuel combustion zone by injection of fuel and air into a closed furnace, conducting the resultant hot gaseous products of combustion in a horizontally extending path, injecting the particulate compound into the emerging hot current of furnace gases and then conducting the current of gases and particulate compound into a vertically extending decomposition zone wherein the hot gases and the solid particles cooperate to decompose the solid particles, and separating the gases and solid particles in a cyclone separator.
Claim 4
Dependent Claim
54 words
The method of claim 4 which includes conducting a current of combustion supporting air in thermal contact with the current of hot gases and solid particles as they pass into the separator to add heat to said combustion supporting air and conducting said current of heated combustion supporting air into the fuel combustion chamber.
Claim 5
Dependent Claim
41 words
The method according to claim 2 which includes conducting said current of combustion supporting air into thermal contact with the solid particles from said cyclone separator to pick up heat from the same, and transfering said heat to the combustion zone.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |