US4049435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for obtaining a lump product
Assignee: Individual
•
Filing: 1976-04-22
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Granted: 1977-09-20
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Expires: 1996-04-22
Abstract
Abstract The proposed method relates to preparation of ores and is intended for production of pellets and briquettes with use being made of mineral hydraulic binders. This method comprises mixing an ore with a mineral hydraulic binder, the mixture obtained is simultaneously homogenized and activated, then said mixture is pelletized and the green lumps are subjected to a heat humidity treatment at 70-100% relative humidity and a temperature of 60°-250° C followed by a two-stage heat treatment, the first stage of said treatment being effected at 70°-100° C until there is a 2-5% content of free moisture in the lumps, and the second stage of heat treatment being effected at a temperature of no less than 100° C and no more than 900° C until there is 0.01-1.0% content of free moisture in the lumps.
Inventors
- 👤 Valery Efimovich Lotosh
- 👤 Vladimir Demyanovich Steblyak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:56
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C22B1/2413; C22B1/2406; C22B1/242; C22B1/243
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
A method for preparing a strengthened pelleted ore product, which comprises an ore of C. than 1 mm in size with a hydraulic binder, simultaneously homogenizing and activating the mixture, pelleting the mixture to obtain green pellets, steaming the green pellets at a temperature of 60°-250° C. and a relative humidity of 70-100%, heat treating the pellets at a first temperature of 70°-100° C until the free moisture content of the pellets is 2-5%, and adjusting to a second heat treatment temperature of from at least 100° to 900° C. until the free moisture content of the pellets is 0.01 to 1.0% thereby obtaining a strengthened ore pellet product.
Claim 2
Independent Claim
109 words
A method for preparing a strengthened pelleted ore product, which comprises an ore of C. than 1 mm in size with a hydraulic binder, simultaneously homogenizing and activating the mixture, pelleting the mixture to obtain green pellets, steaming the green pellets at a temperature of 60°-250° C. and a relative humidity of 70-100%, heat treating the pellets at a first temperature of 70°-100° C until the free moisture content of the pellets is 2-5%, and adjusting to a second heat treatment temperature of from at least 100° to 900° C. until the free moisture content of the pellets is 0.01 to 1.0% thereby obtaining a strengthened ore pellet product.
Claim 3
Dependent Claim
55 words
A method as claimed in claim 1, wherein, in the case of strengthening lumps from a charge with sulfur-bearing materials, the pellets, after heat-humidity treatment, are treated with an aqueous solution of chlorine bearing materials, and the second stage of heat treatment is effected at a temperature of at least 400° C. to remove sulfur.
Claim 4
Dependent Claim
42 words
A method as claimed in claim 1, wherein, in the case of strengthening green pellets with an initial compression strength of less than 2.0 kg said pellets are, prior to the heat-humidity treatment, aged in air till the binder begins to set.
Claim 5
Dependent Claim
51 words
A method as claimed in claim 1, wherein, in the case of strengthening green pellets with an initial compression strength of less than 2.0 kg, said pellets are, prior to the heat humidity treatment, aged in a medium with a 90-100% relative humidity till the end of setting of said binder.
Claim 6
Dependent Claim
50 words
A method as claimed in claim 1, wherein, when use is made of a mineral hydraulic binder with a compression strength of less than 350-450 kg/cm 2 and aged for 28 days, said binder is, before being introduced into the charge, mechanically activated with the specific surface increasing by 10-15%.
References Cited (Backward Citations)
US1858274A
Cited
US2756136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |