US3660029A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for beneficiating ilmenite
Assignee: EDITH W CARPENTER
•
Filing: 1971-04-09
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Granted: 1972-05-02
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Expires: 1991-04-09
Abstract
Abstract A process for treating ilmenite to obtain a beneficiated product having a relatively high titanium dioxide content. Particulate ilmenite is first heated in the presence of a reducing agent to reduce the iron compounds in the ilmenite to ferrous oxide and/or metallic iron. The resulting product is then leached with a dilute inorganic acid to solubilize the reduced iron values. The liquor produced during leaching is then filtered from the unsolubilized residue, and the latter is subjected to a combination of process steps. Such steps include magnetic separation to remove essentially all of the iron valves remaining in the residue, and electrical separation to remove essentially all of the silicon values therein. Also, the residue is roasted at a relatively high temperature to drive off the water of crystallization which associates therewith during leaching. The final product contains up to 98 percent titanium dioxide by weight.
Inventors
- 👤 Ahmed G E Naguib
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:33
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
27 words
A process as recited in claim 1, further comprising the step of magnetically separating essentially all unreduced ferric oxide from said resulting product before said leaching step.
Claim 2
Dependent Claim
22 words
A process as recited in claim 1, further comprising the step of drying said residue before said magnetic and electrical separation steps.
Claim 3
Dependent Claim
26 words
A process as recited in claim 3, wherein said drying and roasting steps are combined in a single step before said magnetic and electrical separation steps.
Claim 4
Dependent Claim
17 words
A process as recited in claim 1, wherein said magnetic separation step is a dry magnetic separation.
Claim 5
Dependent Claim
17 words
A process as recited in claim 1, wherein said magnetic separation step is a wet magnetic separation.
Claim 6
Dependent Claim
18 words
A process as recited in claim 1, wherein said electrical separation step is an ion bombardment electrification separation.
Claim 7
Dependent Claim
14 words
A process as recited in claim 1, wherein said reducing agent is hydrogen gas.
Claim 8
Dependent Claim
14 words
A process as recited in claim 1, wherein said acid is dilute hydrochloric acid.
Claim 9
Dependent Claim
24 words
A process as recited in claim 1, further comprising the step of recycling the gas evolved during said leaching step to said heating step.
Claim 10
Dependent Claim
33 words
A process as recited in claim 1, wherein said acid is an aqueous-acid solution having an acid concentration in the range of from about 22 percent to about 25 percent acid by weight.
Claim 11
Dependent Claim
28 words
A process as recited in claim 1, wherein said leaching step is performed at a temperature in the range of from about 100* C to about 110* C.
Claim 12
Dependent Claim
20 words
A process as recited in claim 1, wherein said filtering step is performed by centrifuging said liquor from said residue.
Claim 13
Dependent Claim
18 words
A process as recited in claim 1, wherein said resulting product contains 5-15 percent metallic iron by weight.
Claim 14
Dependent Claim
18 words
A process as recited in claim 14, wherein said resulting product contains 6-9 percent metallic iron by weight.
Claim 15
Dependent Claim
18 words
A process as recited in claim 1, wherein said heating step is performed in a fluidized bed furnace.
Claim 16
Dependent Claim
28 words
A process as recited in claim 1, wherein said heating step is performed at a temperature in the range of from about 700* C to about 750* C.
Claim 17
Dependent Claim
28 words
A process as recited in claim 1, wherein said roasting step is performed at a temperature in the range of from about 650* C to about 750* C.
Claim 18
Dependent Claim
22 words
A process as recited in claim 1, wherein said ilmenite has a particle size of +270 Tyler mesh before said heating step.
Claim 19
Dependent Claim
24 words
A process as recited in claim 19, wherein said ilmenite has a particle size range of -60, +270 Tyler mesh before said heating step.
References Cited (Backward Citations)
US2127247A
Cited
US2954278A
Cited
US3446590A
Cited
GB1160667A
Cited
US3457037A
Cited
GB1167833A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |