US4053407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for distributing a sludge to be filtered over the upper surface of the filter cloth of a rotating belt filter
Assignee: Metso Minerals Sala AB
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Filing: 1976-09-07
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Granted: 1977-10-11
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Expires: 1996-09-07
Abstract
Abstract The present invention is concerned with a method of distributing sludge to be filtered, to the filter surface of an endless-belt filter, so as to maintain a uniform solids content of said sludge. The incoming sludge is in this connection charged to a sludge receiving means in which the sludge is divided into two part-flows such that one of said part-flows contains a higher percentage of solids than the other, whereafter the two part-flows are united and the resultant flow discharged to said filter surface.
Inventors
- 👤 Rolf Gunnar Jonas Nordengren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:37
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/70; B01D33/72; B01D33/044; B01D33/048
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
In the known method of filtering a sludge which is composed of calcium sulfate as the solid component and phosphoric acid as the liquid component, which method includes transporting a sludge to a point near an endless belt filter, depositing said sludge on said endless belt filter, and filtering at least a portion of the liquid away from said sludge while it is on said endless belt filter, the improvement which comprises: a. introducing said sludge into a sludge receiving zone, b. dividing said sludge into two separate streams in said sludge receiving zone so that one of said two separate streams contains a higher percentage of solids than the other of said two separate streams, c. uniting said two separate streams so as to obtain a united sludge stream of substantially uniform solids content, and d. discharging said united sludge stream on an endless belt filter.
Claim 2
Dependent Claim
147 words
In the known method of filtering a sludge which is composed of calcium sulfate as the solid component and phosphoric acid as the liquid component, which method includes transporting a sludge to a point near an endless belt filter, depositing said sludge on said endless belt filter, and filtering at least a portion of the liquid away from said sludge while it is on said endless belt filter, the improvement which comprises: a. introducing said sludge into a sludge receiving zone, b. dividing said sludge into two separate streams in said sludge receiving zone so that one of said two separate streams contains a higher percentage of solids than the other of said two separate streams, c. uniting said two separate streams so as to obtain a united sludge stream of substantially uniform solids content, and d. discharging said united sludge stream on an endless belt filter.
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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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |