Patent US4484734A successfully refreshed from Google Patents.
Patent US4172029A successfully refreshed from Google Patents.
US4172029A
Expired / Lapsed
US
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Phosphate flotation process
Assignee: Dow Chemical Co
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Filing: 1978-05-11
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Granted: 1979-10-23
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Expires: 1998-05-11
Abstract
Abstract In the flotation of phosphate ore slurries with fuel oil and a fatty acid, the addition of an aromatic polycyclic, hydrocarbon compound bearing a nuclear sulfonic acid or sulfonate moiety on each ring to the ore slurry prior to conditioning enhances the separation of phosphate from silica. Disulfonated biphenyl or diphenyl ether compounds and disulfonated or trisulfonated triphenyl diether, triphenyl or biphenylyl phenyl ether compounds, wherein the compound bears at least one nuclear alkyl group having from 12 to 22 carbon atoms, are particularly advantageous additives in a phosphate flotation process.
Inventors
- 👤 Robert E. Hefner, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:21
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D1/006; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
In a process for beneficiating a siliceous phosphate ore by froth flotation, the process comprising the steps of conditioning an aqueous slurry of phosphate ore at a pH of from 7.5 to 10.5 with a fatty acid and a fuel oil and aerating the conditioned phosphate slurry to float the phosphate, the improvement comprising conditioning the aqueous phosphate slurry prior to aeration with a sulfonated aromatic compound of the formula ##STR3## wherein x, y and z are individually integers of 0 to 2; b, c and d are individually the integers 0 or 1 with the proviso that b+c+d is equal to at least 2; each R is an alkyl radical and each R can be the same or different; f, g and h are individually the integers 0 or 1 with the proviso that if h=0, then g=0; and M + is a hydrogen, alkali metal ion, alkaline earth metal ion or ammonium ion and each M + can be the same or different.
Claim 2
Dependent Claim
165 words
In a process for beneficiating a siliceous phosphate ore by froth flotation, the process comprising the steps of conditioning an aqueous slurry of phosphate ore at a pH of from 7.5 to 10.5 with a fatty acid and a fuel oil and aerating the conditioned phosphate slurry to float the phosphate, the improvement comprising conditioning the aqueous phosphate slurry prior to aeration with a sulfonated aromatic compound of the formula ##STR3## wherein x, y and z are individually integers of 0 to 2; b, c and d are individually the integers 0 or 1 with the proviso that b+c+d is equal to at least 2; each R is an alkyl radical and each R can be the same or different; f, g and h are individually the integers 0 or 1 with the proviso that if h=0, then g=0; and M + is a hydrogen, alkali metal ion, alkaline earth metal ion or ammonium ion and each M + can be the same or different.
Claim 3
Dependent Claim
30 words
The improvement as described in claim 1 with the proviso that if (x+y+z)≠0, then at least one R must be an alkyl radical having from 12 to 22 carbon atoms.
Claim 4
Dependent Claim
32 words
The improvement as described in claim 2 wherein the aqueous phosphate slurry is conditioned with from about 0.03 to about 0.1 kilogram of the sulfonated aromatic compound per ton of phosphate ore.
Claim 5
Dependent Claim
18 words
The improvement as described in claim 3 wherein M + is a sodium, potassium or quaternary ammonium ion.
Claim 6
Dependent Claim
19 words
The improvement as described in claim 4 wherein x, y and z are individually the integers 0 or 1.
Claim 7
Dependent Claim
21 words
The improvement as described in claim 3 wherein f is the integer 1 and g and h are the same integer.
Claim 8
Dependent Claim
15 words
The improvement as described in claim 6 wherein g and h are the integer 0.
Claim 9
Dependent Claim
25 words
The improvement as described in claim 7 wherein x=1, y=0 or 1 and R is an alkyl radical having from 10 to 18 carbon atoms.
Claim 10
Dependent Claim
36 words
The improvement as described in claim 1 wherein the flotation is carried out in water containing alkaline earth ions in a concentration of at least about 20 milligram equivalents of CaCO 3 per liter of water.
Claim 11
Dependent Claim
35 words
The improvement as described in claims 1 or 2 wherein the aqueous phosphate slurry is conditioned with from about 0.02 to about 0.2 kilogram of the sulfonated aromatic compound per metric ton of phosphate ore.
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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) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |