US3603569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kiln preheat and drying section
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1969-12-29
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Granted: 1971-09-07
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Expires: 1989-12-29
Abstract
Abstract An improved kiln preheat and drying section comprising an inner shell concentric and axially aligned with the kiln shell, and provided with a means to feed raw material to be processed into the inner shell and means to feed dust into the annular space defined by the inner shell and kiln shell; and a process for operating the improved preheat and drying section.
Inventors
- 👤 Harry I Abboud
- 👤 Oren C Furnish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:27
CPC Classifications
F; F27; F27B; F27B7/00; F27B7/20; F27B7/32; F27B7/3205; F27B7/14; F27B7/16; F27B7/161; F27B2007/165; F27B2007/2008; F27B2007/3211; F27B2007/3217
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
150 words
In an inclined rotary kiln having a relatively cold feed end and a relatively hot discharge end, said kiln inclined toward the discharge end and having dust collector means associated therewith, the features comprising: a. Concentrically disposed and spacially arranged inner and outer shells at the feed end of the kiln, the inner shell defining an annular space with the outer shell of the kiln; b. means for splitting the dust from the dust collector means into a coarse dust fraction and a fine dust fraction; c. dust-feeding means associated with said dust-splitting means and disposed at the feed end of the kiln, said dust-feeding means arranged in a manner so as to feed the coarse dust fraction into said annular space and said fine dust fraction into said inner shell; and d. means disposed at the feed end of the kiln to feed raw material to said inner shell.
Claim 2
Dependent Claim
150 words
In an inclined rotary kiln having a relatively cold feed end and a relatively hot discharge end, said kiln inclined toward the discharge end and having dust collector means associated therewith, the features comprising: a. Concentrically disposed and spacially arranged inner and outer shells at the feed end of the kiln, the inner shell defining an annular space with the outer shell of the kiln; b. means for splitting the dust from the dust collector means into a coarse dust fraction and a fine dust fraction; c. dust-feeding means associated with said dust-splitting means and disposed at the feed end of the kiln, said dust-feeding means arranged in a manner so as to feed the coarse dust fraction into said annular space and said fine dust fraction into said inner shell; and d. means disposed at the feed end of the kiln to feed raw material to said inner shell.
Claim 3
Dependent Claim
29 words
The inclined rotary kiln of claim 1 having means to mix the coarse dust fraction with the raw material before said raw material is fed to the inner shell.
Claim 4
Dependent Claim
128 words
In the method of heating raw material in an inclined rotary kiln wherein hot gases are passed through said kiln in countercurrent flow to the raw material and thereafter through dust-collector means, wherein the dust from said collector means is returned to the kiln and wherein the raw material and returned dust are moved to the discharge end of said kiln by the rotation thereof, the steps comprising: a. Feeding the raw material into an inner shell, spacially disposed and axially aligned within the feed end of the kiln, b. passing substantially all of said gases through the inner shell, c. returning dust from said dust-collector means to the annular space defined by the outer surface of the inner shell in the inner surface of the kiln shell.
Claim 5
Dependent Claim
128 words
In the method of heating raw material in an inclined rotary kiln wherein hot gases are passed through said kiln in countercurrent flow to the raw material and thereafter through dust-collector means, wherein the dust from said collector means is returned to the kiln and wherein the raw material and returned dust are moved to the discharge end of said kiln by the rotation thereof, the steps comprising: a. Feeding the raw material into an inner shell, spacially disposed and axially aligned within the feed end of the kiln, b. passing substantially all of said gases through the inner shell, c. returning dust from said dust-collector means to the annular space defined by the outer surface of the inner shell in the inner surface of the kiln shell.
Claim 6
Dependent Claim
49 words
The method of claim 3 wherein the dust from said dust-collector means is separated into a coarse fraction and a fine fraction, and wherein the coarse fraction is returned to the inner shell and the fine fraction is returned to the annular space between the inner and outer shells.
Claim 7
Dependent Claim
27 words
The method of claim 4 wherein the coarse fraction of dust is mixed witH the feed material prior to feeding the raw material to the inner shell.
Claim 8
Dependent Claim
25 words
The method of claim 4 wherein at least about 80 percent of the coarse dust fraction has a mean particle diameter greater than 20 microns.
Claim 9
Dependent Claim
25 words
The method of claim 5 wherein at least about 90 percent of the coarse dust fraction has a mean particle diameter greater than 20 microns.
References Cited (Backward Citations)
US2039645A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |