US5651505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of grinding cement
Assignee: Cementa AB
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Filing: 1993-12-03
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Granted: 1997-07-29
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Expires: 2013-12-03
Abstract
Abstract A method of continued grinding of cement is disclosed in order to obtain cement with a high specific surface and/or a steep grain size distribution curve. The grinding is performed in a mill with agitated grinding medium from a specific surface of 300-400 m 2 /kg (Blaine) to a specific surface of up to 1,200 m 2 /kg (Blaine) and with a particle size distribution such that about 80% of the particles pass a sieve opening with a size up to about 25 microns, using grinding bodies with an average size within the interval of 2 to 15 mm.
Inventors
- 👤 Lars Lidstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:08
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/48; C04B7/52; B; B02; B02C; B02C17/00; B02C17/16; Y; Y02; Y02P; Y02P40/00; Y02P40/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
Method of grinding cement, comprising the steps of: providing a grinding medium comprising grinding bodies with an average size within the interval of 2 to 15 mm into an agitating mill, and grinding the cement in said agitating mill with said grinding medium to provide ground cement particles, wherein the cement is ground from a specific surface of 300-400 m 2 /kg (Blaine) to a specific surface of up to 1 200 m 2 /kg (Blaine), and wherein the ground cement particles have a particle size distribution such that about 80% of the particles pass a sieve opening with a size up to about 25 μm.
Claim 2
Dependent Claim
106 words
Method of grinding cement, comprising the steps of: providing a grinding medium comprising grinding bodies with an average size within the interval of 2 to 15 mm into an agitating mill, and grinding the cement in said agitating mill with said grinding medium to provide ground cement particles, wherein the cement is ground from a specific surface of 300-400 m 2 /kg (Blaine) to a specific surface of up to 1 200 m 2 /kg (Blaine), and wherein the ground cement particles have a particle size distribution such that about 80% of the particles pass a sieve opening with a size up to about 25 μm.
Claim 3
Dependent Claim
36 words
Method according to claim 1, characterized in that the grinding is performed to a particle size distribution such that 80% of the particles pass a sieve opening having a size of up to about 15 μm.
Claim 4
Dependent Claim
36 words
Method according to claim 1, characterized in that the grinding is performed to a particle size distribution such that 80% of the particles pass a sieve opening having a size of up to about 10 μm.
Claim 5
Dependent Claim
36 words
Method according to claim 1, characterized in that the grinding is performed to a particle size distribution such that 80% of the particles pass a sieve opening having a size of up to about 4-8 μm.
Claim 6
Dependent Claim
16 words
Method according to claim 1, characterized in that the grinding is performed in a dry environment.
Claim 7
Dependent Claim
16 words
Method according to claim 1, characterized in that the grinding is performed in a wet environment.
Claim 8
Dependent Claim
29 words
Method according to claims 1, characterized in that grinding additives in the form of dispersion agents are added for obtaining of specific surfaces exceeding 300-350 m 2 /kg (Blaine).
Claim 9
Dependent Claim
13 words
The method of claim 7, wherein the grinding additive is glycol or ethanolamine.
Claim 10
Dependent Claim
28 words
Method according to claim 1, characterized in that the continued grinding is performed in direct connection with use in order to maintain the reactivity obtained in the grinding.
Claim 11
Dependent Claim
21 words
Method according to claim 1, characterized in that the ground cement is classified subsequent to the grinding in a classification equipment.
References Cited (Backward Citations)
GB1160569A
Cited
EP0267170A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-07-28 | 2001-01-27 | 2001-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-28 | 2005-01-27 | 2005-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-28 | 2009-01-27 | 2009-07-29 | $7700.00 | Window Closed / Lapsed |