US3620972A
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Method of agglomerating finely divided inorganic phosphates using an orthophosphate agglomerating aid
Assignee: Stauffer Chemical Co
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Filing: 1968-03-12
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Granted: 1971-11-16
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Expires: 1988-03-12
Abstract
Abstract A method is provided for agglomerating finely divided substantially insoluble inorganic phosphate compositions in the presence of an alkali metal orthophosphate having a M2O:P2O5 ratio of from about 2:1 to about 3.21:1. M is an alkali metal having a molecular weight of from 20 to 41 inclusive. The material to be agglomerated is agitated and from about 5 to about 25 parts by weight water is added per 100 parts of material to be agglomerated. Agitation is continued until agglomeration is substantially complete and thereafter the agglomerated material is recovered. Additional embodiments include adding the water as steam, or as orthophosphate solutions.
Inventors
- 👤 Ellis Glenn Fite
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:02
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/36; A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/24; A61Q; A61Q11/00; B; B01; B01J; B01J2/00; B01J2/28; C01B25/38; C01B25/39; C01B25/44; C01B25/45
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
14 words
The method of claim 1 wherein the insoluble inorganic phosphate is sodium aluminum phosphate.
Claim 2
Dependent Claim
9 words
continuing agitation until the agglomeration is substantially complete; and
Claim 3
Dependent Claim
4 words
recovering the agglomerated material.
Claim 4
Dependent Claim
12 words
Method of claim 1 wherein the insoluble inoRganic phosphate is insoluble metaphosphate.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal orthophosphate is disodium phosphate.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the alkali metal orthophosphate is trisodium phosphate.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the water is introduced to the material to be agglomerated as steam.
Claim 8
Dependent Claim
40 words
The method of claim 1 wherein the alkali metal orthophosphate employed is a hydrate containing at least 7 molecules of water per molecule of orthophosphate and wherein it is introduced to the material to be agglomerated in a molten condition.
Claim 9
Dependent Claim
15 words
The method of claim 7 wherein the alkali metal orthophosphate hydrate is disodium phosphate duohydrate.
Claim 10
Dependent Claim
29 words
The method of claim 1 wherein sodium hexametaphosphate is additionally present in an amount of from about 10 to about 50 percent by weight based upon insoluble inorganic phosphate.
Claim 11
Dependent Claim
130 words
A free-flowing substantially homogeneous inorganic agglomerated product consisting essentially of an insoluble inorganic phosphate, from about 25 to about 75 percent by weight of an alkali metal orthophosphate based upon anhydrous weight from about 0 to about 50 percent by weight of an alkali metal hexametaphosphate having a P2O5 content in excess of 66 percent, based on the anhydrous weight and from about 5 to about 25 percent by weight water based on the weight of the final product, wherein said insoluble inorganic phosphate has a primary particle size sufficiently small to pass a screen having a mesh size of at least 200, that alkali metal has in both instances a molecular weight of from 20 to 41 and said agglomerated product is of a size between 10-mesh and 140-mesh.
Claim 12
Dependent Claim
14 words
The product of claim 10 wherein the insoluble inorganic phosphate is sodium aluminum phosphate.
Claim 13
Dependent Claim
13 words
The product of claim 10 wherein the insoluble inorganic phosphate is insoluble metaphosphate.
Claim 14
Dependent Claim
13 words
A product of claim 10 wherein the alkali metal orthophosphate is disodium phosphate.
Claim 15
Dependent Claim
11 words
The product of claim 10 wherein the orthophosphate is trisodium phosphate.
Claim 16
Dependent Claim
25 words
The product of claim 10 wherein the alkali metal hexametaphosphate is present in an amount of from about 10 to about 50 percent by weight.
Claim 17
Dependent Claim
55 words
The product of claim 10 wherein the insoluble inorganic phosphate is a sodium aluminum phosphate, the alkali metal orthophosphate is disodium phosphate and the alkali metal hexametaphosphate is sodium hexametaphosphate, and the insoluble inorganic phosphate has a primary particle size sufficiently small to pass a screen having a mesh size of at least about 325.
Claim 18
Dependent Claim
50 words
The product of claim 10 wherein the insoluble inorganic phosphate is insoluble metaphosphate, the alkali metal orthophosphate is disodium phosphate, the alkali metal hexametaphosphate is sodium hexametaphosphate and the inorganic phosphate has a primary particle size sufficiently small to pass a screen having a mesh size of at least 325.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |