Patent US4135941A successfully refreshed from Google Patents.
US4135941A
Expired / Lapsed
US
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Process for the production of portland type cement clinker
Assignee: Lockheed Martin Corp
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Filing: 1977-04-25
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Granted: 1979-01-23
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Expires: 1997-04-25
Abstract
Abstract An improved process for producing portland and portland type cement clinker wherein argillaceous and calcareous type materials are ground and blended to form a generally homogeneous mixture and subsequently burned in a kiln at a temperature in the range of about 1200° C. to about 1500° C. to form cement clinker, the improvement comprising incorporating into the mixture a fluorine containing mineral acid, selected from the group comprising fluotitanic acid, fluoboric acid, fluophosphoric acid, fluosilicic acid, and hydrofluoric acid, as a fluxing and mineralizing agent, in an amount of up to 3.0% by weight based upon the weight of the dry solids in the mixture.
Inventors
- 👤 Jan P. Skalny
- 👤 Waldemar A. Klemm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:44
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/38; C04B7/42
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
In the process for producing portland cement clinker wherein argillaceous and calcareous type materials are ground and blended to form a generally homogeneous mixture and subsequently burned in a kiln at a temperature in the range of about 1200° C. to about 1500° C. to form cement clinker, the improvement comprising incorporating into said mixture a fluorine containing mineral acid selected from the group consisting of fluosilicic acid, fluotitanic acid, fluoboric acid, and fluophosphoric acid as a fluxing and mineralizing agent in an amount of up to 3.0% by weight based upon the weight of the dry solids in said mixture.
Claim 2
Dependent Claim
101 words
In the process for producing portland cement clinker wherein argillaceous and calcareous type materials are ground and blended to form a generally homogeneous mixture and subsequently burned in a kiln at a temperature in the range of about 1200° C. to about 1500° C. to form cement clinker, the improvement comprising incorporating into said mixture a fluorine containing mineral acid selected from the group consisting of fluosilicic acid, fluotitanic acid, fluoboric acid, and fluophosphoric acid as a fluxing and mineralizing agent in an amount of up to 3.0% by weight based upon the weight of the dry solids in said mixture.
Claim 3
Dependent Claim
14 words
A process according to claim 1 wherein said acid comprises fluosilicic or fluotitanic acid.
Claim 4
Dependent Claim
12 words
A process according to claim 1 wherein said acid comprises fluosilicic acid.
Claim 5
Dependent Claim
30 words
A process according to claim 3 wherein said fluosilicic acid is in the form of a fluosilicic acid solution which comprises about 25% by weight H 2 SiF 6 .
Claim 6
Dependent Claim
12 words
A process according to claim 1 wherein said acid comprises fluotitanic acid.
Claim 7
Dependent Claim
29 words
A process according to claim 5 wherein said fluotitanic acid is in the form of a fluotitanic acid solution which comprises 60% by weight H 2 TiF 6 .
Claim 8
Dependent Claim
36 words
A process according to claim 1 wherein said fluorine containing acid is present in an amount of between about 0.1% and about 1.0% by weight based upon the weight of the dry solids in said mixture.
Claim 9
Dependent Claim
33 words
A process according to claim 1 wherein said acid is present in an amount of between about 0.2% and 0.5% by weight based upon the weight of the dry solids in said mixture.
Claim 10
Dependent Claim
27 words
A process according to claim 1 wherein said mixture comprises a slurry and said fluorine containing mineral acid is added to the slurry as an acid solution.
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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |