US3699206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for beneficiation of titaniferous ores
Assignee: WENDELL E DUNN Inc
•
Filing: 1970-03-23
•
Granted: 1972-10-17
•
Expires: 1990-03-23
Abstract
Abstract Process for beneficiating titaniferous ores to produce essentially pure titanium dioxide comprising alternatingly contacting the ore in a gas-solids reactor with carbon monoxide for a short period of time and then with chlorine for a short period of time and then repeating the alternate carbonylation and chlorination steps at temperatures of 700 to 1,150* C. under fluidizing conditions; converting iron oxide and oxides of metals other than titanium in the ore to iron and other metal chlorides and removing same by volatilization. The titanium dioxide produced is useful as a starting material for the preparation of titanium dioxide pigment.
Inventors
- 👤 Wendell E Dunn Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:48
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1204; C22B34/1209; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
45 words
The process of claim 1 wherein the chlorine and carbon monoxide are separately introduced into the reactor to a point below the bed of ore and at a rate where the ore bed is fluidized, and below the rate where entrainment of beneficiate particles occurs.
Claim 2
Dependent Claim
17 words
The process of claim 1 wherein the temperature within the reactor is 850* C. to 1,090* C.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the temperature within the reactor is 950* to 1,050* C.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the depth of the oRe bed is 1.0 to 5 feet.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the depth of the ore bed is 0.1 to 1.0 feet.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the gas flow rate is 0.19 to 2 feet/second.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein the gas flow rate is 0.19 to 1.25 feet/second.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein the carbonylation and chlorination cycle is repeated 3-12 times.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein the carbonylation and chlorination cycle is repeated 3-10 times.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein the carbonylation and chlorination cycle is repeated 3-6 times.
Claim 11
Dependent Claim
34 words
The process of claim 1 wherein each carbon monoxide-chlorine cycle comprises passing carbon monoxide through the ore for 20 to 30 minutes and then passing chlorine through the ore for 20 to 30 minutes.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |