US3929962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium purification process
Assignee: Individual
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Filing: 1972-08-29
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Granted: 1975-12-30
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Expires: 1992-08-29
Abstract
Abstract A process for refining titania-containing ores is described based on the increased reactivity of lower valent titanium oxides over tetravalent titanium oxides. The process includes the conversion of such titania ores, preferably beneficiated, to lower valent titanium oxides by reduction at elevated temperatures, extraction of the lower valent titanium values with HCl, oxidation of the extracted titanium values to tetravalent titanium compounds and recovery of purified TiO2 from the tetravalent titanium compounds. The residue left after the extraction step may be returned to the conversion step for reduction of residual tetravalent titanium values. Traces of fluorine or hydrofluoric acid have been found to catalyze the reaction.
Inventors
- 👤 Chyn Duog Shiah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:26
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01G23/0536; C01G23/08; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1236; C22B34/124; C22B34/1245; C01P; C01P2006/00; C01P2006/80; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
143 words
THE METHOD OF EXTRACTING PURIFIED TIO2 FROM TITANIUMCONTAINING ORES WHICH COMPRISES THE STEPS OF A. REDUCTION OF SAID ORES AT ELEVATED TEMPERATURES IN THE PRESENCE OF A REDUCING GAS, TO CONVERT AT LEAST 10 WT % OF THE TETRAVALENT TITANIUM CONTENTS OF SAID ORES TO LOWER VALENT TITANOUS COMPOUNDS; B. EXTRACTING SAID LOWER VALENT TITANOUS COMPOUNDS FROM THE SO-TREATED ORES BY SOLUTION AS TITANOUS CHLORIDE IN AN AQUEOUS SOLUTION OF HYDROCHLORIDE ACID C. SEPARATING THE SOLUBLE TITANOUS CHLORIDE EXTRACT FROM THE RESIDUE; D. RETURNING THE RESIDUE, CONTAINING UNDISSOLVED TITANIUM COMPOUNDS, FOR RETREATMENT ACCORDING TO STEP (A); E. SUBJECTING SAID SEPRATED AQUEOUS EXTRACT, CONTAINING DISSOLVED LOWER VALENT TITANOUS CHLORIDE TO AN OXIDATION STEP TO CONVERT SAID TITANOUS CHLORIDE, IN SOLUTION, TO TITANIUM SOLUTIONS; F. HYDROLYZING SAID TITANIUM TETRACHLORIDE SOLUTION TO HYDROUS TITANIUM DIOXIDE; G. CONVERTING SAID HYDROUS TITANIUM DIOXIDE TO TITANIUM DIOXIDE BY CALCINATION.
Claim 2
Independent Claim
143 words
THE METHOD OF EXTRACTING PURIFIED TIO2 FROM TITANIUMCONTAINING ORES WHICH COMPRISES THE STEPS OF A. REDUCTION OF SAID ORES AT ELEVATED TEMPERATURES IN THE PRESENCE OF A REDUCING GAS, TO CONVERT AT LEAST 10 WT % OF THE TETRAVALENT TITANIUM CONTENTS OF SAID ORES TO LOWER VALENT TITANOUS COMPOUNDS; B. EXTRACTING SAID LOWER VALENT TITANOUS COMPOUNDS FROM THE SO-TREATED ORES BY SOLUTION AS TITANOUS CHLORIDE IN AN AQUEOUS SOLUTION OF HYDROCHLORIDE ACID C. SEPARATING THE SOLUBLE TITANOUS CHLORIDE EXTRACT FROM THE RESIDUE; D. RETURNING THE RESIDUE, CONTAINING UNDISSOLVED TITANIUM COMPOUNDS, FOR RETREATMENT ACCORDING TO STEP (A); E. SUBJECTING SAID SEPRATED AQUEOUS EXTRACT, CONTAINING DISSOLVED LOWER VALENT TITANOUS CHLORIDE TO AN OXIDATION STEP TO CONVERT SAID TITANOUS CHLORIDE, IN SOLUTION, TO TITANIUM SOLUTIONS; F. HYDROLYZING SAID TITANIUM TETRACHLORIDE SOLUTION TO HYDROUS TITANIUM DIOXIDE; G. CONVERTING SAID HYDROUS TITANIUM DIOXIDE TO TITANIUM DIOXIDE BY CALCINATION.
Claim 3
Dependent Claim
18 words
The method according to step (a) claim 1 wherein said lower valent compounds of titanium are substantially Ti2O3.
Claim 4
Dependent Claim
18 words
The method according to claim 1 wherein said hydrochloric acid solution contains from 10-30% by weight of HCl.
Claim 5
Dependent Claim
26 words
The method according to claim 1 wherein said HCl solution additionally contains hydrofluoric acid, and/or fluoride salts capable of generating HF in situ, a reaction promoter.
Claim 6
Dependent Claim
28 words
The method according to claim 4 wherein said hydrofluoric acid is generated by adding CaF2 in concentrations of up to 50% by weight (as CaF2) of said HCl.
Claim 7
Dependent Claim
19 words
A method according to claim 1 wherein said separated titanium value is oxidized at temperatures in the range 90*-160*C.
Claim 8
Dependent Claim
29 words
A method according to claim 1 wherein, the titanium tetrachloride from said oxidation is hydrolyzed at temperatures below 260*C to precipitate hydrous titanium dioxide (H2TiO3) from the HCl solution.
Claim 9
Dependent Claim
18 words
The method according to claim 7 wherein said oxidation and hydrolysis steps (e) and (f) are performed simultaneously.
Claim 10
Dependent Claim
19 words
The method according to claim 7 wherein said precipitated H2TiO3 is calcined to dehydrate and form titanium dioxide (TiO2).
Claim 11
Dependent Claim
36 words
The method according to claim 7 wherein after said precipitated H2TiO3 is removed from said solution of HCl, the HCl solution is returned to said extraction step (b) for repeated extraction of said trivalent titanium compounds.
Claim 12
Dependent Claim
17 words
The method according to claim 1 wherein said starting ore is beneficiated to form a synthetic rutile.
Claim 13
Dependent Claim
39 words
The method according to claim 1 wherein said roaster reduction step a) is performed upon ilmenite ore wherein said ore is beneficiated by reducing its iron content to metallic iron and leaching said metallic iron with ferric chloride solution.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |