US4191336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering magnetite from fly ash
Assignee: Individual
•
Filing: 1978-12-11
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Granted: 1980-03-04
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Expires: 1998-12-11
Abstract
Abstract This invention relates to a process for recovering magnetite from fly ash. Fly ash containing magnetite is made into a slurry having 5% to 10% solids by weight and the slurry is then concentrated in a settling tank to a slurry having approximately 20% solids by weight. The concentrated slurry is delivered to a magnetic separator where the magnetite is separated from the remainder of the fly ash. The magnetite is then crushed in a pulverizer to a size so that 95% of the crushed magnetite will pass through a 325 mesh sieve. The crushed magnetite is then delivered to a second magnetite separator which is weaker than the first magnetic separator to separate the crushed magnetite from any impurities. The purified crushed magnetite is then dried and stored.
Inventors
- 👤 Jim W. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:35
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/08; B; B03; B03B; B03B9/00; B03B9/04; B03C; B03C1/00; C04; C04B; C04B18/00; C04B18/04; C04B18/06; C04B18/08; C01P; C01P2004/00; C01P2004/60; C01P2004/61; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
A process for recovering magnetite from fly ash comprising the steps of; making a slurry of fly ash and a liquid, delivering of the slurry to a magnetic separator, separating magnetite from the remainder of the fly ash with the magnetic separator, crushing the magnetite, separating the crushed magnetite from other materials with a second magnetic separator having a weaker magnetic field then the first mentioned magnetic separator, and drying the crushed magnetite.
Claim 2
Dependent Claim
73 words
A process for recovering magnetite from fly ash comprising the steps of; making a slurry of fly ash and a liquid, delivering of the slurry to a magnetic separator, separating magnetite from the remainder of the fly ash with the magnetic separator, crushing the magnetite, separating the crushed magnetite from other materials with a second magnetic separator having a weaker magnetic field then the first mentioned magnetic separator, and drying the crushed magnetite.
Claim 3
Dependent Claim
18 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein the liquid is water.
Claim 4
Dependent Claim
28 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein the slurry of fly ash in a liquid is approximately 20% solids by weight.
Claim 5
Dependent Claim
26 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein 95% of the crushed magnetite will pass through a 325 mesh sieve.
Claim 6
Dependent Claim
50 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein the crushed magnetite has a size whereby 95% of the crushed magnetite will pass through a 325 mesh sieve, and said second magnetic separator has one half the magnetic strength of the first mentioned magnetic separator.
Claim 7
Dependent Claim
30 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein the second magnetic separator has one half the magnetic strength of the first mentioned magnetic separator.
Claim 8
Dependent Claim
35 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein the slurry is approximately 20% solids by weight, and 95% of the crushed magnetite will pass through a 325 mesh sieve.
Claim 9
Dependent Claim
61 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein the liquid is water, said slurry is approximately 20% solids by weight, said crushed magnetite has a size whereby 95% of the magnetite will pass through a 325 mesh sieve, and the second magnetite separator has one half the magnetic strength of the first mentioned magnetic separator.
Claim 10
Dependent Claim
39 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein the liquid is water, the slurry is approximately 20% solids by weight, and 95% of the crushed magnetite will pass through a 325 mesh sieve.
Claim 11
Dependent Claim
59 words
A process for recovering magnetite from fly ash as defined in claim 1, wherein the slurry is approximately 20% solids by weight, the crushed magnetite is of a size whereby 95% of the crushed magnetite will pass through a 325 mesh sieve, and the second magnetic separator has one half the magnetic strength of the first mentioned magnetic separator.
Claim 12
Dependent Claim
168 words
A process for recovering magnetite from fly ash comprising the steps of; making a slurry of fly ash and water having solids between 5% and 10% by weight, delivering the slurry to a settling tank, settling the slurry to a concentration having solids of approximately 20% by weight, delivering the concentrated slurry to a slurry head tank, delivering concentrated slurry from the slurry head tank to each of a pair of identical magnetic separators connected in parallel, separating magnetite from the remainder of the fly ash at each of the magnetic separators, delivering the magnetite from each of the magnetite separators to a single pulverizer, crushing the magnetite in the pulverizer to a size whereby 95% of the crushed magnetite will pass through a 325 mesh sieve, delivering the crushed magnetite to a third magnetic separator which has a weaker magnetic field than either of the two first mentioned magnetic separators, removing the crushed magnetite from any impurities at the third magnetic separator, and drying the crushed magnetite.
Claim 13
Dependent Claim
168 words
A process for recovering magnetite from fly ash comprising the steps of; making a slurry of fly ash and water having solids between 5% and 10% by weight, delivering the slurry to a settling tank, settling the slurry to a concentration having solids of approximately 20% by weight, delivering the concentrated slurry to a slurry head tank, delivering concentrated slurry from the slurry head tank to each of a pair of identical magnetic separators connected in parallel, separating magnetite from the remainder of the fly ash at each of the magnetic separators, delivering the magnetite from each of the magnetite separators to a single pulverizer, crushing the magnetite in the pulverizer to a size whereby 95% of the crushed magnetite will pass through a 325 mesh sieve, delivering the crushed magnetite to a third magnetic separator which has a weaker magnetic field than either of the two first mentioned magnetic separators, removing the crushed magnetite from any impurities at the third magnetic separator, and drying the crushed magnetite.
References Cited (Backward Citations)
US1512870A
Cited
US3769054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-04 | 1983-09-03 | 1984-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-04 | 1987-09-03 | 1988-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-04 | 1991-09-03 | 1992-03-04 | $7700.00 | Window Closed / Lapsed |