US3849111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for purifying and agglomerating pyrite cinders
Assignee: Cold Bound Pellets AB
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Filing: 1969-12-16
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Granted: 1974-11-19
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Expires: 1989-12-16
Abstract
Abstract Purifying and agglomerating pyrite cinders by subjecting ground pyrite cinders to a flotation operation and cold binding agglomerates of a mixture of the roasted and floated pyrite material and a binding agent. The roasted pyrite material may be leached before the flotation for the purpose of removing sulphate material therefrom.
Inventors
- 👤 P Kihlstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:00
CPC Classifications
B; B03; B03D; B03D1/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
106 words
A METHOD FOR PURIFYING AND AGGLOMERATING PYRITE CINDERS, COMPRISING (1) GRINDING THE PYRITE CINDERS, (IN AT LEAST ONE GRINDING OPERATION) (2) REMOVING SULPHIDE MATERIAL FROM THE GROUND PYRITE CINDERS BY FLOTATION, (3) FORMING AN AQUEOUS MIXTURE CONTAINING THE GROUND AND PURIFIED PYRITE CINDER AND A BINDING AGENT COMPRISING SLAKED LIME, FINELY GROUND AND SLAKED STEEL FURNACE SLAG, PORTLAND CEMENT, FINELY-DIVIDED SILICA, FINELY DIVIDED SILICATE CONTAINING MATERIAL OR MIXTURES THEREOF, (4) AGGLOMERATING THE MIXTURE AND (5) HEATING THE AGGLOMERATES FOR 1 TO 24 HOURS IN AN ATOMOSPHERE CONSISTING ESSENTIALLY OF STEAM, AT A TEMPERATURE OF APPROXIMATELY 160* -230*C AND A PRESSURE OF APPROXIMATELY 10-70 ATMOSPHERES ABOVE ATMOSPHERIC.
Claim 2
Independent Claim
106 words
A METHOD FOR PURIFYING AND AGGLOMERATING PYRITE CINDERS, COMPRISING (1) GRINDING THE PYRITE CINDERS, (IN AT LEAST ONE GRINDING OPERATION) (2) REMOVING SULPHIDE MATERIAL FROM THE GROUND PYRITE CINDERS BY FLOTATION, (3) FORMING AN AQUEOUS MIXTURE CONTAINING THE GROUND AND PURIFIED PYRITE CINDER AND A BINDING AGENT COMPRISING SLAKED LIME, FINELY GROUND AND SLAKED STEEL FURNACE SLAG, PORTLAND CEMENT, FINELY-DIVIDED SILICA, FINELY DIVIDED SILICATE CONTAINING MATERIAL OR MIXTURES THEREOF, (4) AGGLOMERATING THE MIXTURE AND (5) HEATING THE AGGLOMERATES FOR 1 TO 24 HOURS IN AN ATOMOSPHERE CONSISTING ESSENTIALLY OF STEAM, AT A TEMPERATURE OF APPROXIMATELY 160* -230*C AND A PRESSURE OF APPROXIMATELY 10-70 ATMOSPHERES ABOVE ATMOSPHERIC.
Claim 3
Dependent Claim
29 words
A process as claimed in claim 1, characterized in that prior to flotation the roasted pyrite material is subjected to leaching for the purpose of removing sulphate material therefrom.
Claim 4
Dependent Claim
28 words
A process as claimed in claim 2, characterized in that leaching is effected with the assistance of water which has been acidified by means of a sulphur compound.
Claim 5
Dependent Claim
35 words
A process as claimed in any of claim 1, characterized in that there is added to the mixture iron ore concentrates having a particle size exceeding the particle size of the ground roasted pyrite material.
Claim 6
Dependent Claim
24 words
A process as claimed in any of claim 1, characterized in that the ground roasted pyrite material is floated in a substantially neutral environment.
Claim 7
Dependent Claim
22 words
A process of claim 5, characterized in that during the flotation process there is used a collector of the dithiocarbonate or dithiophosphate-type.
Claim 8
Dependent Claim
35 words
The process of claim 1, wherein the pyrite cinders are ground to a particle size-within the range of 80 percent by weight below 90 Mu m and 80 percent by weight below 30 Mu m.
Claim 9
Dependent Claim
14 words
The process of claim 1 wherein the binding agent consists essentially of slaked lime.
Claim 10
Dependent Claim
19 words
The process of claim 1 wherein the binding agent consists essentially of finely ground and slaked steel furnace slag.
Claim 11
Dependent Claim
14 words
The process of claim 1 wherein the binding agent consists essentially of Portland cement.
Claim 12
Dependent Claim
15 words
The process of claim 1 wherein the binding agent consists essentially of finely divided silica.
Claim 13
Dependent Claim
16 words
The process of claim 1 wherein the binding agent consists essentially of finely divided silicate material.
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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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |