US3777994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of lead from accumulator scrap
Assignee: Kloeckner Humboldt Deutz AG
•
Filing: 1972-01-26
•
Granted: 1973-12-11
•
Expires: 1992-01-26
Abstract
Abstract Lead accumulators or used storage batteries are coarsely ground into pieces in an impact crusher and the fine material containing metallic lead is separated and ground again and then classified. The remaining part of the coarsely ground material is subjected to a sink-flotation-separation and the fine material recovered as a sludge is introduced into a tubular vibrating mill filled with grinding bodies and ground therein, whereupon the ground material is screened and classified to recover the lead therein.
Inventors
- 👤 R Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:17
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/54; B; B03; B03B; B03B9/00; B03B9/06; B03B9/061; H01M10/42; H01M10/52; B03B2009/066; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02W; Y02W30/00; Y02W30/50; Y02W30/52; Y02W30/62; Y02W30/84
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
101 words
A method for the recovery of metallic lead from accumulator scrap comprising: 1. comminuting the scrap material, 2. removing coarser materials from the comminuted mass, 3. subjecting the finer materials to classification to provide a fine grain and a coarse grain fraction, 4. further comminuting the fine grain fraction from step (3) in a tube mill, 5. subjecting the lead-containing coarser materials from step (2) to a sink-float separation, 6. removing iron from the product recovered from step (5), 7. passing the resulting iron-free product to said tube mill of step (4), and 8. further classifying the product of step (7).
Claim 2
Independent Claim
101 words
A method for the recovery of metallic lead from accumulator scrap comprising: 1. comminuting the scrap material, 2. removing coarser materials from the comminuted mass, 3. subjecting the finer materials to classification to provide a fine grain and a coarse grain fraction, 4. further comminuting the fine grain fraction from step (3) in a tube mill, 5. subjecting the lead-containing coarser materials from step (2) to a sink-float separation, 6. removing iron from the product recovered from step (5), 7. passing the resulting iron-free product to said tube mill of step (4), and 8. further classifying the product of step (7).
Claim 3
Dependent Claim
7 words
removing coarser materials from the comminuted mass,
Claim 4
Dependent Claim
7 words
removing coarser materials from the comminuted mass,
Claim 5
Dependent Claim
18 words
The method of claim 1 in which step (2) is carried out by means of wet sieve filtration.
Claim 6
Dependent Claim
18 words
The method of claim 1 in which the separation of iron in step (6) is carried out magnetically.
Claim 7
Dependent Claim
16 words
subjecting the finer materials to classification to provide a fine grain and a coarse grain fraction,
Claim 8
Dependent Claim
16 words
subjecting the finer materials to classification to provide a fine grain and a coarse grain fraction,
Claim 9
Dependent Claim
13 words
further comminuting the fine grain fraction from step (3) in a tube mill,
Claim 10
Dependent Claim
13 words
further comminuting the fine grain fraction from step (3) in a tube mill,
Claim 11
Dependent Claim
12 words
subjecting the lead-containing coarser materials from step (2) to a sink-float separation,
Claim 12
Dependent Claim
12 words
subjecting the lead-containing coarser materials from step (2) to a sink-float separation,
Claim 13
Dependent Claim
9 words
removing iron from the product recovered from step (5),
Claim 14
Dependent Claim
9 words
removing iron from the product recovered from step (5),
Claim 15
Dependent Claim
13 words
passing the resulting iron-free product to said tube mill of step (4), and
Claim 16
Dependent Claim
13 words
passing the resulting iron-free product to said tube mill of step (4), and
Claim 17
Dependent Claim
7 words
further classifying the product of step (7).
Claim 18
Dependent Claim
7 words
further classifying the product of step (7).
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |