Patent US3913742A successfully refreshed from Google Patents.
US3913742A
Expired / Lapsed
US
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Flotation of oxide minerals in hot pulp
Assignee: Individual
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Filing: 1974-05-24
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Granted: 1975-10-21
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Expires: 1994-05-24
Abstract
Abstract A flotation method for concentrating iron-bearing oxide ores wherein the ore is both activated by a cation of a heavy metal and conditioned with a collector at a temperature within the range of 80*-100*C and floated at a temperature within the range of 50*-80*C.
Inventors
- 👤 Heikki Reino Laapas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:53
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
IN A METHOD OF CONCENTRATING IRONBEARING OXIDE MINERALS SUCH AS ILMENITE, CHROMITE, HERMATITE AND MAGNETITE BY FLOTATION WHICH INCLUDES THE STEPS OF: (A) ACTIVATION WHEREIN AN ACTIVATING AGENT OF CATIONS OF THE METALS OF ATOMIC WEIGHT OVER 40 IS ADDED TO THE PULP FOR IMPROVING THE EFFECTIVENESS OF THE COLLECTOR, (B) CONDITIONING WHEREIN THE COLLECTOR IS ADDED TO THE PULP, (C) DEPRESSING WHEREIN A GANGUE DEPRESSANT IS ADDED TO FOR DEPRESSING THE GANGUE MINERALS, AND (D) FLOATATION FOR SEPARATING THE CONCENTRATE OF MINERALS, THE IMPROVEMENT WHICH COMPRISES: PERFORMING BOTH THE ACTIVATION AND CONDITIONING STEPS WITHIN THE TEMPERATURE RANGE OF 80*-100*C, AND THE FLOTATION STEP WITHIN THE TEMPERATURE RANGE OF 50*-80*C.
Claim 2
Dependent Claim
18 words
The method as described in claim 1, wherein the activation-conditioning steps are carried out in a non-deslimed pulp.
Claim 3
Dependent Claim
12 words
The method as described in claim 1, wherein Cu is the activator.
Claim 4
Dependent Claim
14 words
The method as described in claim 1, wherein hydrofluoric acid is the gangue depressant.
References Cited (Backward Citations)
US2471414A
Cited
US2741364A
Cited
US2861687A
Cited
US3067957A
Cited
US3295767A
Cited
US3430765A
Cited
US3768738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |