US4351741A
Expired / Lapsed
US
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Method of preparing antimony pentoxide, colloids thereof and their preparation
Assignee: HARSHAW/FILTROL PARTNERSHIP A PARTNERSHIP OF
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Filing: 1979-02-05
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Granted: 1982-09-28
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Expires: 1999-02-05
Abstract
Abstract A method of preparing antimony pentoxide from solids containing antimony sulfides is described. The method comprises the steps of (a) leaching the antimony values from the solids with an aqueous potassium hydroxide solution to form an antimony-containing solution and a gangue, (b) oxidizing the antimony present in the leaching solution to a pentavalent antimony, (c) recovering the oxidized solution, and (d) adding an inorganic acid to the solution to reduce the pH of the solution to about 5-7 whereby antimony pentoxide is precipitated from the solution. The gangue may be separated from the leach solution either prior to or after the oxidizing step. In a preferred embodiment, the oxidation of the solution is conducted in the presence of a catalyst which comprises a water-soluble copper salt, a quinone, a hydroquinone or mixtures of one or more of these.
Inventors
- 👤 John W. Vogt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:37
CPC Classifications
C; C01; C01G; C01G30/00; C01G30/004; C01G30/005
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
82 words
A method of preparing antimony pentoxide from antimony sulfide-bearing solids which comprises the steps of (a) leaching the antimony values from the solids with an aqueous potassium hydroxide solution to form an antimony-containing solution and a gangue, (b) oxidizing the antimony present in the leaching solution to a pentavalent antimony, (c) recovering the oxidized solution, and (d) adding an inorganic acid to the solution to reduce the pH of the solution to about 5-7 whereby antimony pentoxide is precipitated from the solution.
Claim 2
Independent Claim
82 words
A method of preparing antimony pentoxide from antimony sulfide-bearing solids which comprises the steps of (a) leaching the antimony values from the solids with an aqueous potassium hydroxide solution to form an antimony-containing solution and a gangue, (b) oxidizing the antimony present in the leaching solution to a pentavalent antimony, (c) recovering the oxidized solution, and (d) adding an inorganic acid to the solution to reduce the pH of the solution to about 5-7 whereby antimony pentoxide is precipitated from the solution.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein the oxidation in step (b) is conducted in the presence of a catalyst comprising a water-soluble copper salt, a quinone, a hydroquinone, or mixtures of one or more of these.
Claim 4
Dependent Claim
19 words
The method of claim 2 wherein the catalyst is a mixture of a water-soluble copper salt and a hydroquinone.
Claim 5
Dependent Claim
11 words
The method of claim 2 wherein the hydroquinone is a benzenediol.
Claim 6
Dependent Claim
12 words
The method of claim 2 wherein the copper salt is copper sulfate.
Claim 7
Dependent Claim
23 words
The method of claim 1 wherein sufficient acid is added in step (d) to reduce the pH of the solution to about 6.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein the gangue is separated from the leaching solution prior to oxidation.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein the gangue is separated from the leach solution after oxidation.
Claim 10
Independent Claim
122 words
A method of preparing antimony pentoxide from antimony sulfide-bearing solids which comprises the steps of (a) leaching the antimony values from the solids with an aqueous potassium hydroxide solution containing a catalyst comprising a water-soluble copper salt, a quinone, a hydroquinone, or mixtures of one or more of these to form an antimony-containing alkaline solution and a gangue, (b) passing oxygen through the antimony-containing alkaline solution containing the catalyst whereby the antimony present in the solution is oxidized to a pentavalent antimony, (c) recovering the oxidized solution from the gangue, (d) adding an inorganic acid to the solution to reduce the pH of the solution to about 5-7 whereby antimony pentoxide is precipitated from the solution, and (e) recovering the antimony pentoxide.
Claim 11
Independent Claim
122 words
A method of preparing antimony pentoxide from antimony sulfide-bearing solids which comprises the steps of (a) leaching the antimony values from the solids with an aqueous potassium hydroxide solution containing a catalyst comprising a water-soluble copper salt, a quinone, a hydroquinone, or mixtures of one or more of these to form an antimony-containing alkaline solution and a gangue, (b) passing oxygen through the antimony-containing alkaline solution containing the catalyst whereby the antimony present in the solution is oxidized to a pentavalent antimony, (c) recovering the oxidized solution from the gangue, (d) adding an inorganic acid to the solution to reduce the pH of the solution to about 5-7 whereby antimony pentoxide is precipitated from the solution, and (e) recovering the antimony pentoxide.
Claim 12
Dependent Claim
34 words
The method of claim 9 wherein steps (a) and (b) are combined as a single step, whereby oxygen is passed through an aqueous mixture comprising the antimony sulfide-bearing solids, the catalyst, and potassium hydroxide.
Claim 13
Dependent Claim
25 words
The method of claim 9 wherein the gangue is separated from the leach solution after step (a) and before oxidizing the solution in step (b).
Claim 14
Dependent Claim
18 words
The method of claim 9 wherein the catalyst is a mixture of a copper salt and a hydroquinone.
Claim 15
Dependent Claim
16 words
The method of claim 12 wherein the catalyst is a mixture of copper sulfate and 1,4-benzenediol.
Claim 16
Dependent Claim
25 words
The method of claim 13 wherein the weight ratio of copper sulfate to 1,4-benzenediol is in the range of from about 1:1 to about 1:5.
Claim 17
Dependent Claim
24 words
A method of preparing antimony pentoxide colloids which comprises dispersing the antimony pentoxide prepared in accordance with the method of claim 1 in water.
Claim 18
Dependent Claim
28 words
The method of claim 15 wherein the weight ratio of antimony pentoxide to water is sufficient to provide a colloid containing up to about 40% of antimony pentoxide.
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) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |