US4897218A
Expired / Lapsed
US
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Methods for suppressing cement clinker dust emissions
Assignee: Veolia WTS USA Inc
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Filing: 1987-04-24
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Granted: 1990-01-30
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Expires: 2007-04-24
Abstract
Abstract A method of suppressing dust generation emanating from cement clinker by applying a foamed water/surfactant solution thereto. The solution comprises a low salt tolerant anionic surfactant.
Inventors
- 👤 Donald C. Roe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:09
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/48; C04B40/00; C09; C09K; C09K3/00; C09K3/32; C04B2103/00; C04B2103/0068; C04B2103/0075; Y; Y10; Y10S; Y10S516/00; Y10S516/905; Y10S516/917; Y10S516/919
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
87 words
A method of suppressing dust generation emanating from calcined cement clinker comprising: foaming a solution comprising water and a low salt tolerant surfactant foaming agent, applying said foam solution to said cement clinker, grinding said clinker with gypsum to form cement, and slurrying said cement with water and inhibiting foam formation in said slurried cement by interaction of said low salt tolerant surfactant and dissolved salts in said slurried cement so as not to result in a significant increase in air entrapment in the final cement product.
Claim 2
Independent Claim
87 words
A method of suppressing dust generation emanating from calcined cement clinker comprising: foaming a solution comprising water and a low salt tolerant surfactant foaming agent, applying said foam solution to said cement clinker, grinding said clinker with gypsum to form cement, and slurrying said cement with water and inhibiting foam formation in said slurried cement by interaction of said low salt tolerant surfactant and dissolved salts in said slurried cement so as not to result in a significant increase in air entrapment in the final cement product.
Claim 3
Dependent Claim
30 words
Method as defined in claim 1 further comprising, before said foaming step, diluting said solution with water having a hardness of from 0 to 250 ppm (as CaCO 3 ).
Claim 4
Dependent Claim
16 words
Method as defined in claim 2 wherein said low salt tolerant surfactant is an anionic surfactant.
Claim 5
Dependent Claim
13 words
Method as defined in claim 3 wherein said surfactant is sodium dodecylbenzene sulfonate.
Claim 6
Dependent Claim
13 words
Method as defined in claim 3 wherein said surfactant is sodium lauryl sulfate.
Claim 7
Dependent Claim
15 words
Method as defined in claim 3 wherein said surfactant is a sodium alpha olefin sulfonate.
Claim 8
Dependent Claim
22 words
Method as defined in claim 2 wherein said solution, before dilution comprises 1- 50wt % low salt tolerant anionic surfactant remainder water.
Claim 9
Dependent Claim
30 words
Method as defined in claim 7 wherein said, before dilution, solution comprises 15-23 wt % sodium dodecylbenzene sulfonate 2-5 wt % sodium C 14 -C 16 olefin sulfonate remainder water.
Claim 10
Dependent Claim
17 words
Method as defined in claim 3 wherein said surfactant is the sodium salt of a fatty acid.
Claim 11
Dependent Claim
27 words
Method as defined in claim 3 wherein said anionic surfactant is used in combination with a nonionic surfactant to improve the dust control properties of said foam.
Claim 12
Dependent Claim
28 words
Method as defined in claim 7 wherein said solution is diluted in said water at a dilution ratio of from about 99:1 to about 95:5, water to solution.
Claim 13
Dependent Claim
26 words
Method of claim 8 wherein said solution is diluted in said water at a dilution ratio of from about 99:1 to about 95:5, water to solution.
Claim 14
Independent Claim
72 words
A method of suppressing dust generation emanating from calcined cement clinker comprising selecting a low salt tolerant surfactant such that upon forming a cement product by slurrying, foam formation is inhibited in said slurried cement product so as not to result in a significant increase in air entrapment in the final cement product, and applying a foamed solution comprising water and said low salt tolerant surfactant foaming agent to said cement clinker.
Claim 15
Independent Claim
72 words
A method of suppressing dust generation emanating from calcined cement clinker comprising selecting a low salt tolerant surfactant such that upon forming a cement product by slurrying, foam formation is inhibited in said slurried cement product so as not to result in a significant increase in air entrapment in the final cement product, and applying a foamed solution comprising water and said low salt tolerant surfactant foaming agent to said cement clinker.
Claim 16
Dependent Claim
42 words
Method of claim 13 wherein said low salt tolerant surfactant is selected so that increased air entrapment due to said foam formation in said cement product is not increased by not more than about 20% compared to air entrapment in untreated clinker.
Claim 17
Dependent Claim
14 words
Method of claim 13 wherein said low salt tolerant surfactant is an anionic surfactant.
Claim 18
Dependent Claim
18 words
Method of claim 15 wherein said low salt tolerant surfactant is the sodium salt of a fatty acid.
Claim 19
Dependent Claim
11 words
Method of claim 15 wherein said surfactant is sodium dodecylbenzene sulfonate.
Claim 20
Dependent Claim
11 words
Method of claim 15 wherein said surfactant is sodium lauryl sulfate.
Claim 21
Dependent Claim
12 words
Method of claim 15 wherein said surfactant is sodium alpha olefin sulfonate.
Claim 22
Independent Claim
92 words
A method of suppressing dust generation emanating from calcined cement clinker comprising: foaming a solution consisting essentially of water and low salt tolerant salts of fatty acids surfactant foaming agent, applying said foam solution to said cement clinker, grinding said clinker with gypsum to form cement, and slurrying said cement with water and inhibiting foam formation in said slurried cement by interaction of said low salt tolerant surfactant and dissolved salts in said slurried cement so as to not result in a significant increase in air entrapment in the final cement product.
Claim 23
Independent Claim
92 words
A method of suppressing dust generation emanating from calcined cement clinker comprising: foaming a solution consisting essentially of water and low salt tolerant salts of fatty acids surfactant foaming agent, applying said foam solution to said cement clinker, grinding said clinker with gypsum to form cement, and slurrying said cement with water and inhibiting foam formation in said slurried cement by interaction of said low salt tolerant surfactant and dissolved salts in said slurried cement so as to not result in a significant increase in air entrapment in the final cement product.
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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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |