US3630351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of upgrading alumina-bearing materials
Assignee: GIBBSITE CORP OF AMERICA
•
Filing: 1969-03-03
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Granted: 1971-12-28
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Expires: 1989-03-03
Abstract
Abstract A continuous method of separating associated gibbsite (A12O3.3H2O) from the siliceous material contained in gibbsitebearing sands and alumina-bearing ores characterized by a reagent to a slurry of the raw material for the purpose of promoting separation and settling of slurrying the sand or ore with water and a reagent in an amount sufficient to cause separation of the siliceous material from the alumina and to permit settling of heavy siliceous material from the slurry. The reagent is selected from the group consisting of sodium hypochlorite, sodium pyrophosphate and ammonium hydroxide, and trisodium phosphate, wherein sodium hypochlorite is preferred.
Inventors
- 👤 Richard W Uhinck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:14
CPC Classifications
B; B03; B03B; B03B1/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
31 words
A process according to claim 1 in which the sodium hypochlorite concentration in the water phase of the slurry is in the range of from 0.003 to 6 percent by weight.
Claim 2
Dependent Claim
27 words
A process according to claim 1 in which the sodium hypochlorite concentration in the water phase of the slurry is from 0.012 to 0.014 percent by weight.
Claim 3
Dependent Claim
80 words
A process of separating alumina from the siliceous material contained in alumina-bearing sand comprising the steps of slurrying the sand with water and sodium hypochlorite in an amount sufficient to cause separation of the siliceous material from the alumina and to permit settling of heavy siliceous material, settling and separating said heavy siliceous material from the slurry to obtain a suspension of alumina and lighter siliceous material, and centrifuging said suspension to reduce the siliceous material content of said suspension.
Claim 4
Dependent Claim
31 words
A process according to claim 4 in which the sodium hypochlorite concentration in the water phase of the slurry is in the range of from 0.003 to 6 percent by weight.
Claim 5
Dependent Claim
27 words
A process according to claim 4 in which the sodium hypochlorite concentration in the water phase of the slurry is from 0.012 to 0.014 percent by weight.
Claim 6
Dependent Claim
74 words
In a process of separating gibbsite from the silica contained in gibbsite-bearing sand, the steps comprising slurrying the sand with water and an aqueous solution of sodium hypochlorite having a concentration of from 0.003 to 6 percent by weight in the water phase of the slurry to cause separation of the silica from the gibbsite and to permit settling of heavy silica values, and settling and separating said heavy silica values from the slurry.
Claim 7
Dependent Claim
77 words
A process of separating gibbsite from the silica contained in gibbsite-bearing sand comprising the steps of slurrying the sand with water and an aqueous solution of sodium hypochlorite having a concentration of from 0.003 to 6 percent by weight in the water phase of the slurry, settling and separating heavy silica values from the slurry to obtain a suspension of gibbsite and lighter silica values, and centrifuging said suspension to reduce the silica content of said suspension.
Claim 8
Dependent Claim
28 words
A process according to claim 8 wherein the concentration of the sodium hypochlorite in the water phase of the slurry is from 0.012 to 0.014 percent by weight.
Claim 9
Dependent Claim
126 words
In a process of separating alumina from the siliceous material contained in alumina-bearing sand, the steps comprising slurrying the sand with water and a reagent consisting essentially of sodium pyrophosphate and ammonium hydroxide to cause separation of the siliceous material from the alumina and to cause settling of heavy siliceous material from the slurry, the concentration of the sodium pyrophosphate in the water phase of the slurry being in the range of from 0.003 to 0.10 percent by weight and the concentration of the ammonium hydroxide in the water phase of the slurry being in the range of from 0.003 to 6 percent by weight, and settling and separating said heavy siliceous material from the slurry to obtain a suspension of alumina and lighter siliceous material.
Claim 10
Dependent Claim
25 words
The process according to claim 10 in which the ammonium hydroxide concentration is approximately 0.02 percent by weight in the water phase of the slurry.
Claim 11
Dependent Claim
25 words
A process according to claim 10 in which the sodium pyrophosphate concentration is approximately 0.008 percent by weight in the water phase of the slurry.
Claim 12
Dependent Claim
22 words
A process according to claim 10 including the step of centrifuging said suspension to reduce the siliceous material content of said suspension.
Claim 13
Dependent Claim
71 words
In a process of separating alumina from the siliceous material contained in alumina-bearing sand comprising the steps Of slurrying the sand with water and trisodium phosphate, the concentration of the trisodium phosphate in the water phase of the slurry being in the range of from 0.003 to 6 percent by weight, and settling and separating heavy siliceous material from the slurry to obtain a suspension of alumina and lighter siliceous material.
Claim 14
Dependent Claim
25 words
A process according to claim 14 in which the trisodium phosphate concentration is approximately 0.015 percent by weight in the water phase of the slurry.
Claim 15
Dependent Claim
22 words
A process according to claim 14 including the step of centrifuging said suspension to reduce the siliceous material content of said suspension.
Claim 16
Dependent Claim
74 words
In a process of separating gibbsite from the silica contained in gibbsite-bearing sand, the steps comprising slurrying the sand with water and a dilute solution of an oxidizing reagent in an amount sufficient to cause separation of the silica from the alumina and to permit settling of heavy silica values, agitating the slurry, and settling and separating said heavy silica values from the slurry to obtain a suspension of alumina and lighter silica values.
Claim 17
Dependent Claim
17 words
A process according to claim 17 including the step of incorporating a flocculating agent in the slurry.
Claim 18
Dependent Claim
33 words
A process according to claim 18 wherein the flocculating agent is an amine acetate salt having a concentration in the water phase of the slurry of from 0.001 to 0.1 percent by weight.
Claim 19
Dependent Claim
21 words
A process according to claim 17 including the step of centrifuging said suspension to reduce the silica content of said suspension.
Claim 20
Dependent Claim
85 words
In a process of separating gibbsite from the silica contained in gibbsite-bearing sand, the steps comprising slurrying the sand with water and a reagent in an amount sufficient to cause separation of the gibbsite from the silica and to permit settling of heavy silica values, said reagent being selected from the group consisting of sodium hypochlorite, sodium pyrophosphate and ammonium hydroxide, and trisodium phosphate, and settling and separating said heavy silica values from the slurry to obtain a suspension of gibbsite and lighter silica values.
Claim 21
Dependent Claim
21 words
A process according to claim 21 including the step of centrifuging said suspension to reduce the silica content of said suspension.
References Cited (Backward Citations)
GB563045A
Cited
US3509066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |