US4294705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and an agent for chemical purification of water by means of chemical precipitation and magnetic sludge separation
Assignee: Boliden AB
•
Filing: 1979-05-31
•
Granted: 1981-10-13
•
Expires: 1999-05-31
Abstract
Abstract A method and an agent for chemical purification of water is provided, especially waste water with subsequent magnetic sludge separation. A precipitation agent comprising as component aluminium sulphate and/or iron sulphate is used together with a magnetic material for the purification. In order to provide uniform distribution of the magnetic material in the agent composition it is added to the aluminum and/or iron sulphate component of the composition when said component is in the form of a melt or solution prior to crystallization of said composition.
Inventors
- 👤 Carl-Johan S. Hellestam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:40
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/48; C02F1/488; B; B03; B03C; B03C1/00; B03C1/002; B03C1/005; B03C1/015; B03C1/02; B03C1/025; C02F1/52; C02F1/5236
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A method of chemically purifying water with a subsequent magnetic sludge separation comprising introducing into water a solid crystalline precipitant comprising as major components Al 2 (SO 4 ) 3 and/or FeSO 4 together with a magnetic material, said precipitant consisting of a solid, crystalline composition having a uniform distribution of the magnetic material therein.
Claim 2
Independent Claim
55 words
A method of chemically purifying water with a subsequent magnetic sludge separation comprising introducing into water a solid crystalline precipitant comprising as major components Al 2 (SO 4 ) 3 and/or FeSO 4 together with a magnetic material, said precipitant consisting of a solid, crystalline composition having a uniform distribution of the magnetic material therein.
References Cited (Backward Citations)
SE318529B
Cited
SE321649B
Cited
US3697420A
Cited
US3567026A
Cited
US3983033A
Cited
US3912634A
Cited
DE2551030C3
Cited
US4108767A
Cited
US4089779A
Cited
US4193866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |