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US4243179A
Expired / Lapsed
US
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Process for preparation of raw material minimizing the size degradation of anatase ore
Assignee: Vale SA
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Filing: 1978-12-20
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Granted: 1981-01-06
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Expires: 1998-12-20
Abstract
Abstract Invention patent for "Process for preparation of raw material, minimizing the grain size degradation of anatase ore". The process basically consists of the removal of the minerals more resistant to comminution than anatase, before its grinding stage. The process includes the wet disaggregation of the ore, screening and crushing of the ore originating in the disaggregation step, classification, screening of the coarse product of the classification, magnetic concentration, grinding for liberation of anatase and desliming followed by thickening, filtering and drying of the material.
Inventors
- 👤 Gustavo Magalhaes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:01
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A process for the concentration of anatase ore wherein grain size degradation is minimized comprising: (1) wet disaggregation of anatase ore in a rotating drum, wherein the percentage of solids is greater than 40%; (2) screening and crushing the wet-disaggregated ore to a grain size having a maximum size of about 19 mm; (3) classification, wherein the percentage of solids is greater than 20%; (4) screening of the classified product; (5) magnetic concentration to remove magnetizable minerals; (6) grinding the non-magnetic fraction to liberate anatase from the gangues while avoiding the formation of ultra-fines; and (7) desliming the anatase followed by thickening, filtering and drying.
Claim 2
Dependent Claim
105 words
A process for the concentration of anatase ore wherein grain size degradation is minimized comprising: (1) wet disaggregation of anatase ore in a rotating drum, wherein the percentage of solids is greater than 40%; (2) screening and crushing the wet-disaggregated ore to a grain size having a maximum size of about 19 mm; (3) classification, wherein the percentage of solids is greater than 20%; (4) screening of the classified product; (5) magnetic concentration to remove magnetizable minerals; (6) grinding the non-magnetic fraction to liberate anatase from the gangues while avoiding the formation of ultra-fines; and (7) desliming the anatase followed by thickening, filtering and drying.
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) | 1984-01-06 | 1984-07-07 | 1985-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-06 | 1988-07-07 | 1989-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-06 | 1992-07-07 | 1993-01-06 | $7700.00 | Window Closed / Lapsed |