US3816094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the conversion of chromite ore to sodium chromate
Assignee: Honeywell International Inc
•
Filing: 1972-03-09
•
Granted: 1974-06-11
•
Expires: 1992-03-09
Abstract
Abstract A method of producing sodium chromate from chromite ore which involves mixing the ore with sodium carbonate and a refractory diluent, pelleting the mixture at a temperature of at least 36* C. using a pelleting liquid which may be water or water containing dissolved substances, drying and roasting the pellets under oxidizing conditions, then disintegrating and extracting the pellets to obtain an aqueous solution of sodium chromate. The practice of pelleting the mix at a temperature at least above that at which sodium carbonate decahydrate normally forms, provides pellets of improved strength to withstand handling and roasting in a furnace.
Inventors
- 👤 A Gancy
- 👤 W Low
- 👤 D Frick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:26
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2406; C01; C01G; C01G37/00; C01G37/14; C22B1/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
14 words
The method of claim 1 wherein the pelleting liquid is water containing dissolved solids.
Claim 2
Dependent Claim
16 words
The method of claim 1 wherein the pelleting liquid is water containing sodium carbonate in solution.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the green pellets are thereafter dried at a temperature up to 500* C.
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein soda ash is present in the amount of between 80 and 200% of the stoichiometric amount required to convert the chromium values present in the ore to sodium chromate.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein the pelleting composition contains a refractory diluent in an amount up to 200% of the weight of the chromite ore.
Claim 6
Dependent Claim
15 words
The method of claim 6 wherein the refractory diluent is recycled extracted chromite ore residue.
Claim 7
Dependent Claim
12 words
The method of claim 6 wherein the refractory diluent is pyrites cinder.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein about 30 - 150% by weight of refractory diluent is mixed with the chromite ore mixture.
Claim 9
Dependent Claim
43 words
A green pellet produced by forming pellets from a composition including chromite ore, sodium carbonate and substantially pure water as the pelleting liquid at temperature of at least 36* C to prevent the formation of sodium carbonate decahydrate during formation of said pellets.
Claim 10
Dependent Claim
23 words
A green pellet of claim 10 containing a refractory diluent in an amount up to 200% of the weight of the chromite ore.
Claim 11
Dependent Claim
27 words
A dried green pellet having a compressive strength of at least 10 pounds comprising the pellet of claim 10, dried at a temperature up to 500* C.
Claim 12
Dependent Claim
27 words
A dried green pellet having a compressive strength of at least 10 pounds comprising the pellet of claim 11, dried at a temperature up to 500* C.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |