Patent US5565807A successfully refreshed from Google Patents.
Patent US4175952A successfully refreshed from Google Patents.
US4175952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of iron and titanium metal values
Assignee: Honeywell UOP LLC
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Filing: 1978-07-19
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Granted: 1979-11-27
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Expires: 1998-07-19
Abstract
Abstract Iron metal values and titanium metal values may be recovered from iron and titanium bearing sources such as an ilmenite ore by subjecting the source to a reductive roast after crushing the source to a desired particle size. The reduced source is then leached by treatment with a halogen-containing compound to form soluble titanium halides and iron halides. Thereafter the soluble titanium halide is precipitated by treatment with iron oxides such as ferric oxide and after separation from the soluble iron halides is recovered as titanium dioxide. The soluble iron halides are then crystallized by reducing the temperature of the solution and one portion of the crystals are subjected to a reduction step to form metallic iron. The other portion of the iron halide crystals is oxidized to form ferric oxide which is used to precipitate the titanium compound.
Inventors
- 👤 William K. Tolley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:08
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1236; C22B34/124; C22B34/1245; C21; C21B; C21B13/00; C21B13/006; C21B15/00; C21B15/006; C22B34/1218; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
A process for the recovery of iron values and titanium values from ilmenite which comprises the steps of: (a) crushing said ilmenite; (b) subjecting said crushed ilmenite to a reductive roast at a temperature of from about 600° to about 1000° C. in the presence of hydrogen, carbon monoxide, or a mixture of carbon monoxide and hydrogen; (c) leaching the resultant reduced ilmenite with a leach solution comprising hydrogen chloride; (d) separating insoluble gangue from the soluble metal chlorides; (e) precipitating titanium dioxide from the soluble metal chlorides by treatment with ferric oxide; (f) separating said titanium dioxide from soluble iron chloride and recovering said titanium dioxide; (g) reducing the temperature of the soluble iron chloride sufficiently to crystallize the iron chloride; (h) reducing a major portion of said iron chloride to form metallic iron and hydrogen chloride and recovering the metallic iron; (i) oxidizing the other portion of said iron chloride to form ferric oxide; and (j) recycling said ferric oxide to step (e) of the process.
Claim 2
Dependent Claim
168 words
A process for the recovery of iron values and titanium values from ilmenite which comprises the steps of: (a) crushing said ilmenite; (b) subjecting said crushed ilmenite to a reductive roast at a temperature of from about 600° to about 1000° C. in the presence of hydrogen, carbon monoxide, or a mixture of carbon monoxide and hydrogen; (c) leaching the resultant reduced ilmenite with a leach solution comprising hydrogen chloride; (d) separating insoluble gangue from the soluble metal chlorides; (e) precipitating titanium dioxide from the soluble metal chlorides by treatment with ferric oxide; (f) separating said titanium dioxide from soluble iron chloride and recovering said titanium dioxide; (g) reducing the temperature of the soluble iron chloride sufficiently to crystallize the iron chloride; (h) reducing a major portion of said iron chloride to form metallic iron and hydrogen chloride and recovering the metallic iron; (i) oxidizing the other portion of said iron chloride to form ferric oxide; and (j) recycling said ferric oxide to step (e) of the process.
Claim 3
Dependent Claim
32 words
The process as set forth in claim 1 in which said reductive roast of said ilmenite is effected at a temperature in the range of from about 600° to about 900° C.
Claim 4
Dependent Claim
32 words
The process as set forth in claim 1 in which the precipitation of said titanium dioxide is effected at a temperature in the range of from about 80° to about 110° C.
Claim 5
Dependent Claim
29 words
The process as set forth in claim 1 in which said iron chloride is crystallized at a temperature in the range of from about 0° to about 90° C.
Claim 6
Dependent Claim
32 words
The process as set forth in claim 1 in which the reduction of said iron chloride is effected at a temperature in the range of from about 600° to about 900° C.
Claim 7
Dependent Claim
36 words
The process as set forth in claim 1 in which said hydrogen chloride formed by the reduction of said iron chloride is recycled to the leaching step for use as a portion of said leach solution.
Claim 8
Dependent Claim
38 words
The process as set forth in claim 1 in which the oxidation of said iron chloride is effected by treatment with an oxygen-containing gas at a temperature in the range of from about 300° to about 800° C.
Claim 9
Dependent Claim
27 words
The process as set forth in claim 7 in which the hydrogen chloride formed during the oxidation of said iron chloride is recycled to said crystallization step.
Claim 10
Dependent Claim
48 words
The process as set forth in claim 1 in which said crushed ilmenite is subjected to an oxidation step by treatment with an oxygen-containing gas at a temperature in the range of from about 600° to about 900° C. prior to subjecting said ilmenite to a reductive roast.
References Cited (Backward Citations)
CA582579A
Cited
US2088913A
Cited
US3076692A
Cited
US3236596A
Cited
US3407033A
Cited
US3529931A
Cited
US3825419A
Cited
US3859077A
Cited
US3929962A
Cited
US3903239A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-11-26 | 1983-05-28 | 1983-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-26 | 1987-05-28 | 1987-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-26 | 1991-05-28 | 1991-11-27 | $7700.00 | Window Closed / Lapsed |