US4116822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of selectively separating glass from waste material
Assignee: Carpco Inc
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Filing: 1976-06-30
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Granted: 1978-09-26
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Expires: 1996-06-30
Abstract
Abstract Separation of glass from waste material by high tension techniques. The waste is sized to a range from 1/8 to 1 1/2 inches, dried to a moisture content less than 2%, air classified to remove low bulk density material, and subjected to magnetic separation to remove ferrous metal. The waste is then fed to the top of a rotating grounded drum and subjected successively to ion bombardment from corona discharge electrodes and to an electrostatic field from a static electrode. The glass remains pinned to the roll while other materials come off in the static field.
Inventors
- 👤 Clyde B. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:46
CPC Classifications
B; B03; B03C; B03C7/00; B03C7/02; B03C7/06; B03B; B03B9/00; B03B9/06; B03B9/061; B03B9/062; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/52; Y02W30/60; Y10; Y10S; Y10S209/00; Y10S209/93
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
195 words
A method of separating glass particles from waste material comprising the steps of: (a) sizing the waste material to a particle size greater than 1/8 inch and less than 11/2 inches; (b) subjecting the waste material to preliminary classification to remove low bulk density material and reducing the moisture content of the waste material to less than 2%; (c) pinning the glass particles to a grounded electrode comprising a metal drum having a diameter between about 14 and about 36 inches rotating at a rate lying in a range from about 8 to about 25 rpm by feeding the waste material in contact with said grounded electrode at a rate between 50 and 150 pounds per hour per inch of grounded electrode length through a first zone wherein the waste material is subjected to ion bombardment from at least one ionizing D.C. corona discharge electrode; (d) removing non-glass particles by passing the waste material in contact with said grounded metal electrode into a second zone wherein the waste material is subjected to an electrostatic field from a non-ionizing electrode; and (e) releasing and collecting the glass particles from said grounded electrode in a third zone.
Claim 2
Independent Claim
195 words
A method of separating glass particles from waste material comprising the steps of: (a) sizing the waste material to a particle size greater than 1/8 inch and less than 11/2 inches; (b) subjecting the waste material to preliminary classification to remove low bulk density material and reducing the moisture content of the waste material to less than 2%; (c) pinning the glass particles to a grounded electrode comprising a metal drum having a diameter between about 14 and about 36 inches rotating at a rate lying in a range from about 8 to about 25 rpm by feeding the waste material in contact with said grounded electrode at a rate between 50 and 150 pounds per hour per inch of grounded electrode length through a first zone wherein the waste material is subjected to ion bombardment from at least one ionizing D.C. corona discharge electrode; (d) removing non-glass particles by passing the waste material in contact with said grounded metal electrode into a second zone wherein the waste material is subjected to an electrostatic field from a non-ionizing electrode; and (e) releasing and collecting the glass particles from said grounded electrode in a third zone.
Claim 3
Dependent Claim
37 words
A method as recited in claim 1 further comprising the step of subjecting the waste material to magnetic separation to remove ferrous metal particles prior to the step of pinning the glass particles to said grounded electrode.
Claim 4
Dependent Claim
16 words
A method as recited in claim 1 wherein said preliminary classification is effected by air classification.
Claim 5
Dependent Claim
15 words
A method as recited in claim 1 wherein said corona discharge electrodes are focusing electrodes.
Claim 6
Dependent Claim
32 words
A method as recited in claim 4 wherein said focusing corona discharge electrodes are spaced from the grounded rotating drum electrode a distance lying in the range from 2 to 4 inches.
Claim 7
Dependent Claim
26 words
A method as recited in claim 5 wherein the voltage applied to said corona discharge electrodes lies in the range from 20 kilovolts to 40 kilovolts.
Claim 8
Dependent Claim
27 words
A method as recited in claim 6 wherein said corona discharge electrodes are energized by negative polarity D.C. potential in the range of 25 to 35 kilovolts.
Claim 9
Dependent Claim
20 words
A method as recited in claim 6 wherein the number of corona discharge electrodes in the first zone is 3.
Claim 10
Dependent Claim
27 words
A method as recited in claim 6 wherein said corona discharge electrodes are energized by positive polarity D.C. potential in the range of 25 to 35 kilovolts.
Claim 11
Dependent Claim
30 words
A method as recited in claim 1 wherein the feed rate lies between 80 pounds per hour per inch of grounded electrode length and 110 pounds per hour per inch.
Claim 12
Dependent Claim
41 words
A method as recited in claim 1 wherein the line of demarcation between the second and third zone is established by a splitter spaced a distance in the range of from 11/2 inches to 3 inches from the grounded rotating electrode.
Claim 13
Dependent Claim
30 words
A method as recited in claim 1 wherein the particle size of the waste material fed to the grounded electrode is in the range of 1/8 inch to 11/8 inches.
Claim 14
Dependent Claim
21 words
A method as recited in claim 1 wherein the moisture content of the waste material is reduced to less than 1%.
Claim 15
Dependent Claim
119 words
A method as recited in claim 1 wherein the collected glass particles contain residual non-glass particles further comprising the additional steps of: passing the collected particles from said third zone to a fourth zone in contact with a second grounded electrode wherein the collected particles are subjected to ion bombardment from at least one ionizing electrode whereby the glass particles are pinned to the second electrode; collecting the residual non-glass particles by passing the particles from said fourth zone in contact with said second grounded electrode to a fifth zone wherein the particles are subjected to an electrostatic field from a non-ionizing electrode; and releasing and collecting the glass particles from said second grounded electrode in a sixth zone.
Claim 16
Dependent Claim
151 words
A method as recited in claim 14 wherein the collected non-glass particles from zone 2 contain residual glass particles further comprising the additional steps of: passing the collected particles from said second zone to a seventh zone in contact with a third grounded electrode wherein the collected particles are subjected to ion bombardment from at least one ionizing electrode whereby the residual glass particles are pinned to said third grounded electrode; collecting the non-glass particles by passing the particles from said seventh zone in contact with said third grounded electrode to an eighth zone wherein the particles are subjected to an electrostatic field from a non-ionizing electrode; releasing and collecting the residual glass particles from said third grounded electrode in a ninth zone; and recycling the residual non-glass particles from said fifth zone and the residual glass particles from said ninth zone to the feed material entering the first treatment zone.
Claim 17
Dependent Claim
29 words
A method as recited in claim 15 wherein the ionizing and non-ionizing electrodes in the first, second, fourth, fifth, seventh and eighth zones are all negative polarity D.C. electrodes.
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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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |