US4274599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ore grinding process including a grinding aid of an anionic polyelectrolyte
Assignee: Dow Chemical Co
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Filing: 1978-08-11
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Granted: 1981-06-23
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Expires: 1998-08-11
Abstract
Abstract A process for grinding coal or ores containing metal values comprising carrying out said grinding in a liquid medium and with a grinding aid comprising an anionic polyelectrolyte dispersible in the liquid medium and having a hydrocarbon backbone and a plurality of pendant anionic groups, said grinding aid being present in an amount effective to provide increased grinding efficiency.
Inventors
- 👤 Willy Manfroy
- 👤 Richard R. Klimpel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:36
CPC Classifications
B; B02; B02C; B02C23/00; B02C23/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
60 words
A process for grinding coal or ores containing metal values comprising carrying out said grinding in the presence of a liquid medium and a grinding aid comprising an anionic polyelectrolyte dispersible in said medium and having a polyethylenic backbone and a plurality of pendant anionic groups, said grinding aid being employed in an amount effective to provide increased grinding efficiency.
Claim 2
Dependent Claim
60 words
A process for grinding coal or ores containing metal values comprising carrying out said grinding in the presence of a liquid medium and a grinding aid comprising an anionic polyelectrolyte dispersible in said medium and having a polyethylenic backbone and a plurality of pendant anionic groups, said grinding aid being employed in an amount effective to provide increased grinding efficiency.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the proportion of anionic groups in the polyelectrolyte range from about 1 to about 14 milliequivalents of anionic moiety per gram of electrolyte.
Claim 4
Dependent Claim
29 words
The process of claim 2 wherein the proportion of anionic groups in the polyelectrolyte range from about 2 to about 12 milliequivalents of anionic moiety per gram of polyelectrolyte.
Claim 5
Dependent Claim
22 words
The process of claim 1 wherein the pendant anionic groups on the polyethylenic backbone have a pKa of about 8 or less.
Claim 6
Dependent Claim
22 words
The process of claim 2 wherein the pendant anionic groups on the polyethylenic backbone have a pKa of about 6 or less.
Claim 7
Dependent Claim
22 words
The process of claim 3 wherein the pendant anionic groups on the polyethylenic backbone have a pKa of about 6 or less.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the anionic groups are carboxylate or sulfonate.
Claim 9
Dependent Claim
13 words
The process of claim 4 wherein the anionic groups are carboxylate or sulfonate.
Claim 10
Dependent Claim
17 words
The process of claim 1 wherein the polyelectrolyte is a water-dispersible polymer or copolymer of anionic monomers.
Claim 11
Dependent Claim
68 words
The process of claim 9 wherein said polyelectrolyte is a polymer of alpha,beta-ethylenically unsaturated carboxylic acids, partial esters of alpha,beta-ethylenically unsaturated polycarboxylic acids, N-sulfoalkyl derivatives of alpha,beta-ethylenically unsaturated amides, sulfoalkyl esters of alpha,beta-ethylenically unsaturated carboxylic acids, alpha,beta-ethylenically unsaturated aromatic sulfonic acids, including copolymers of at least one of the aforementioned monomers with at least one other ethylenically unsaturated monomer; sulfonated monovinylidene aromatic polymers; or sulfonated aliphatic monoolefinic polymers.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein the polyelectrolyte has a molecular weight of from about 200 to about 100,000.
Claim 13
Dependent Claim
19 words
The process of claim 1 wherein the polyelectrolyte has a molecular weight of from about 1000 to about 60,000.
Claim 14
Dependent Claim
19 words
The process of claim 1 wherein the polyelectrolyte has a molecular weight of from about 2000 to about 20,000.
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein ores containing metal values are ground.
Claim 16
Dependent Claim
9 words
The process of claim 1 wherein coal is ground.
Claim 17
Dependent Claim
12 words
The process of claim 14 wherein the ore is an iron ore.
Claim 18
Dependent Claim
12 words
The process of claim 14 wherein the ore is a copper ore.
Claim 19
Dependent Claim
12 words
The process of claim 14 wherein the ore is a gold ore.
Claim 20
Dependent Claim
25 words
The process of claim 10 wherein the polyelectrolyte is a polymer of alpha,beta-ethylenically unsaturated carboxylic acids or the partial esters of alpha-beta-ethylenically unsaturated polycarboxylic acids.
Claim 21
Dependent Claim
12 words
The process of claim 19 wherein ores containing metal values are ground.
Claim 22
Dependent Claim
9 words
The process of claim 19 wherein coal is ground.
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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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |