Patent US4405588A successfully refreshed from Google Patents.
US4405588A
Expired / Lapsed
US
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Process of removing iron impurities from ores
Assignee: Materias Primas Monterrey SA
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Filing: 1981-12-21
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Granted: 1983-09-20
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Expires: 2001-12-21
Abstract
Abstract A process of removing iron impurities from ores, particularly useful for removing stains of iron impurities adhered to silica sand particles, comprises grinding the ore, washing and desliming the ground ore to remove the major part of the clay-type binder, attrition-scrubbing the deslimed particles to release further amounts of binder therefrom, washing and desliming to remove said binder, drying and heating the ore particles, treating the hot particles with a chemical agent suitable to conver the iron impurities into water soluble iron compounds, attrition-scrubbing the hot suspension of chemically treated particles to release the stains of iron impurities, and washing with cold water and desliming to recover the purified ore particles.
Inventors
- 👤 Alejandro J. Caballero
- 👤 Ricardo I. Holcombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:51
CPC Classifications
C; C22; C22B; C22B1/00; B; B03; B03B; B03B9/00; C03; C03C; C03C1/00; C03C1/02; C03C1/022
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A process of removing iron impurities from ores comprising grinding the ore, washing and desliming the ground ore to remove the major part of the clay-type binder, attrition-scrubbing the deslimed particles to release further amounts of binder therefrom, washing and desliming to remove said binder, drying and heating the ore particles, treating the hot particles with a chemical agent suitable to convert the iron impurities into water soluble iron compounds, attrition-scrubbing the hot suspension of chemically treated particles to release the stains of iron impurities thereby forming a hot suspension of the chemically treated particles in said treating agent, and washing with cold water and desliming to recover the purified ore particles.
Claim 2
Dependent Claim
112 words
A process of removing iron impurities from ores comprising grinding the ore, washing and desliming the ground ore to remove the major part of the clay-type binder, attrition-scrubbing the deslimed particles to release further amounts of binder therefrom, washing and desliming to remove said binder, drying and heating the ore particles, treating the hot particles with a chemical agent suitable to convert the iron impurities into water soluble iron compounds, attrition-scrubbing the hot suspension of chemically treated particles to release the stains of iron impurities thereby forming a hot suspension of the chemically treated particles in said treating agent, and washing with cold water and desliming to recover the purified ore particles.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein said ore from which the iron impurities are to be removed is sandstone.
Claim 4
Dependent Claim
25 words
A process according to claim 2 wherein said chemical agent suitable to convert the iron impurities into water soluble iron compounds is concentrated sulfuric acid.
Claim 5
Dependent Claim
25 words
A process according to claim 2 wherein said chemical agent suitable to conver the iron impurities into water soluble iron compounds is 35% hydrochloric acid.
Claim 6
Dependent Claim
26 words
A process according to claim 2 wherein said chemical agent suitable to convert the iron impurities into water soluble iron compounds is 50% caustic soda solution.
Claim 7
Dependent Claim
34 words
A process according to claim 1 wherein said hot particles treated with said chemical agent are at a temperature of from about 100° to about 250° C., preferably of from 150° to 250° C.
Claim 8
Dependent Claim
27 words
A process according to claim 6 wherein said hot particles are treated with said chemical agent for a period of time of from 5 to 45 minutes.
Claim 9
Dependent Claim
40 words
A process according to claim 1 wherein said attrition-scrubbing of the hot suspension of chemically treated particles is effected at a solids content of from 65% to 80% and for a period of time of from 1 to 10 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) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |