US4798628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Settable mineral clinker compositions
Assignee: Blue Circle Industries PLC
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Filing: 1987-07-23
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Granted: 1989-01-17
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Expires: 2007-07-23
Abstract
Abstract A settable cementitious composition is produced by mixing a ground mineral composition containing the phase 4CaO.3Al2O3.SO3, in the presence of water, with a source of alkali metal or alkaline earth metal under alkaline conditions. In the pump packing method of stowing cavities in underground mines, an aqueous slurry of the mineral composition is mixed with a second slurry containing calcium sulfate, lime and, preferably, bentonite, an alkali metal sulfate and a setting and/or hardening accelerator. The components may be provided initially as a dry mixture. A preferred mineral composition comprises at least 15% by weight of 4CaO.3Al2O3.SO3, less than 1% by weight of free lime, less than 25% by weight of CaO.2Al2O3 and not more than 10% by weight of 12CaO.7Al2O3.
Inventors
- 👤 Peter S. Mills
- 👤 Geoffrey R. Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:54
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/06; C04B28/065; C04B7/00; C04B7/32; C04B7/323
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
121 words
A mineral clinker oomposition containing 4CaO.3Al 2 O 3 .SO 3 , in an amount of from 15 to 68%, and not more than 45.6% of 2CaO.Al 2 O 3 .SiO 2 , the balance, if any, of the composition being composed essentially of at least one component selected from the group consisting of not more than 1.0% of free lime, less than 25% of CaO.2Al 2 O 3 , not more than 10% of 12CaO.7Al 2 O 3 , less than 5% of CaO.TiO 2 , less than 10% of ferrite phase, up to 60% of CaO.Al 2 O 3 , and up to 4.1% of CaSO 4 ; the said percentages being by weight of the mineral clinker composition.
Claim 2
Dependent Claim
121 words
A mineral clinker oomposition containing 4CaO.3Al 2 O 3 .SO 3 , in an amount of from 15 to 68%, and not more than 45.6% of 2CaO.Al 2 O 3 .SiO 2 , the balance, if any, of the composition being composed essentially of at least one component selected from the group consisting of not more than 1.0% of free lime, less than 25% of CaO.2Al 2 O 3 , not more than 10% of 12CaO.7Al 2 O 3 , less than 5% of CaO.TiO 2 , less than 10% of ferrite phase, up to 60% of CaO.Al 2 O 3 , and up to 4.1% of CaSO 4 ; the said percentages being by weight of the mineral clinker composition.
Claim 3
Dependent Claim
22 words
A composition according to claim 1 characterized in that it contains less than 20% by weight of CaO.Al 2 O 3 .
Claim 4
Dependent Claim
27 words
A composition according to claim 1 or 2, characterized in that it contains from 35% to 65% by weight of 4CaO.3Al 2 O 3 .SO 3 .
Claim 5
Dependent Claim
21 words
A composition according to claim 1 or 2 characterised in that it contains less than 0.5% by weight of free lime.
Claim 6
Dependent Claim
19 words
A composition according to claim 4 characterised in that it contains less than 0.2% by weight of free lime.
Claim 7
Dependent Claim
24 words
A composition according to claim 1 or 2 characterised in that it contains less than 5% by weight of CaO.2Al 2 O 3 .
Claim 8
Dependent Claim
22 words
A composition according to claim 1 or 2, characterised in that it contains less than 5% of 12CaO.7Al 2 O 3 .
Claim 9
Dependent Claim
18 words
A composition according to claim 1 or 2, characterised in that a CaSO 4 phase is essentially absent.
Claim 10
Dependent Claim
25 words
A composition according to claim 1 characterised in that it contains less than 22.8% by a weight of 2CaO.Al 2 O 3 .SiO 2 .
Claim 11
Dependent Claim
17 words
A composition according to claim 1 or 9, characterised in that it is in a ground form.
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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) | 1992-01-17 | 1992-07-18 | 1993-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-17 | 1996-07-18 | 1997-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-17 | 2000-07-18 | 2001-01-17 | $7700.00 | Window Closed / Lapsed |