US4178176A
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: 1979-12-11
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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 ilmenite by subjecting the source to a reductive roast followed by leaching of the reduced source with a halogen-containing compound. Thereafter, the iron halide is crystallized and separated from the soluble titanium halides. One portion of the iron halides is subjected to a reducing step to form metallic iron while a second portion is oxidized, the iron oxides being used to precipitate the titanium as titanium dioxide. The titanium dioxide may then be separated and recovered while the liquid portion is recycled to the leaching zone.
Inventors
- 👤 William K. Tolley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:26
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/006; C21B15/00; C21B15/006; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1236; C22B34/124; C22B34/1245; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
160 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 to form iron chlorides and titanium chlorides; (d) removing insoluble gangue; (e) cooling the soluble metal chlorides sufficiently to crystallize the iron chloride; (f) separating the solid iron halide from the soluble titanium chloride; (g) reducing a major portion of said iron chloride to form metallic iron hydrogen chloride, and recovering the metallic iron; (h) oxidizing the other portion of said iron chloride to form ferric oxide; (i) contacting said soluble titanium chloride with said ferric oxide to precipitate solid titanium dioxide; and (j) separating and recovering said titanium dioxide.
Claim 2
Dependent Claim
160 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 to form iron chlorides and titanium chlorides; (d) removing insoluble gangue; (e) cooling the soluble metal chlorides sufficiently to crystallize the iron chloride; (f) separating the solid iron halide from the soluble titanium chloride; (g) reducing a major portion of said iron chloride to form metallic iron hydrogen chloride, and recovering the metallic iron; (h) oxidizing the other portion of said iron chloride to form ferric oxide; (i) contacting said soluble titanium chloride with said ferric oxide to precipitate solid titanium dioxide; and (j) separating and recovering said titanium dioxide.
Claim 3
Dependent Claim
29 words
The process as set forth in claim 1 in which said reductive roast is effected at a temperature in the range of from about 600° to about 900° C.
Claim 4
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 ambient to about 90° C.
Claim 5
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 6
Dependent Claim
35 words
The process as set forth in claim 4 in which 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 7
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 compound at a temperature in the range of from about 300° to about 700° C.
Claim 8
Dependent Claim
30 words
The process as set forth in claim 6 in which hydrogen chloride which is formed during the oxidation of said iron chloride is recycled to the iron halide crystallization step.
Claim 9
Dependent Claim
33 words
The process as set forth in claim 1 in which the precipitation of said solid titanium dioxide is effected at a temperature in the range of from about 80° to about 110° C.
Claim 10
Dependent Claim
27 words
The process as set forth in claim 1 in which soluble iron compounds which are separated from the solid titanium dioxide are recycled to said leaching step.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |