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Patent US4006029A successfully refreshed from Google Patents.
US4006029A
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Hydration resistant fused dolomitic grain and production method therefor
Assignee: Saint Gobain Ceramics and Plastics Inc
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Filing: 1974-06-17
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Granted: 1977-02-01
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Expires: 1994-06-17
Abstract
Abstract A basic fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO, 33-50% CaO, and preferably at least 98% MgO + CaO. The method of producing the fused refractory material by melting and solidifying a batch of refractory raw materials, wherein the cooling rate inducing solidification throughout the fused melt is at least 600 Centigrade degrees per hour and sufficient to yield the fused refractory product characterized by a fine microstructure retaining at least 2.0% MgO in solid solution in the lime phase and increased hydration resistance of the fused refractory material.
Inventors
- 👤 Donald L. Guile
- 👤 Robert K. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/653; C04B35/01; C04B35/03; C04B35/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
46 words
A basic, fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO and 33-50% CaO, and being characterized in at least a surface layer thereof by a fine microcrystalline structure having at least 2.0% MgO in solid solution in the CaO phase.
Claim 2
Dependent Claim
46 words
A basic, fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO and 33-50% CaO, and being characterized in at least a surface layer thereof by a fine microcrystalline structure having at least 2.0% MgO in solid solution in the CaO phase.
Claim 3
Dependent Claim
21 words
The fused refractory material of claim 1 wherein the microcrystalline structure has 2.0%-17% MgO in solid solution in the CaO phase.
Claim 4
Dependent Claim
22 words
The fused refractory material of claim 1 wherein the microcrystalline structure has about 2.3-7.5% MgO in solid solution in the CaO phase.
Claim 5
Dependent Claim
17 words
The fused refractory material of claim 3 consisting of at least 98% MgO plus CaO, by weight.
Claim 6
Dependent Claim
42 words
A basic, fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO and 33-50% CaO, and being characterized throughout the material by a fine microcrystalline structure having at least 2.0% MgO in solid solution in the CaO phase.
Claim 7
Dependent Claim
42 words
A basic, fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO and 33-50% CaO, and being characterized throughout the material by a fine microcrystalline structure having at least 2.0% MgO in solid solution in the CaO phase.
Claim 8
Dependent Claim
22 words
The fused refractory material of claim 5 wherein the microcrystalline structure has about 2.3-7.5% MgO in solid solution in the CaO phase.
Claim 9
Dependent Claim
17 words
The fused refractory material of claim 6 consisting of at least 98% MgO plus CaO by weight.
Claim 10
Dependent Claim
73 words
An improved method of producing a basic fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO and 33-50% CaO, by a process of melting and solidifying a refractory raw material wherein the improvement comprises cooling the melt to induce solidification at a rate sufficient to retain at least 2.0% MgO in solid solution with the CaO phase in at least a surface layer surrounding the fused refractory material.
Claim 11
Dependent Claim
73 words
An improved method of producing a basic fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO and 33-50% CaO, by a process of melting and solidifying a refractory raw material wherein the improvement comprises cooling the melt to induce solidification at a rate sufficient to retain at least 2.0% MgO in solid solution with the CaO phase in at least a surface layer surrounding the fused refractory material.
Claim 12
Dependent Claim
23 words
The method of claim 8 wherein the cooling rate is sufficient to retain about 2.3-7.5% MgO in solid solution in the CaO phase.
Claim 13
Dependent Claim
26 words
The method of claim 9 wherein the cooling rate at the surface of the fused material is between about 2000 and 14,400 Centigrade degrees per hour.
Claim 14
Dependent Claim
31 words
The method of producing fused refractory material according to claim 8 wherein cooling of the melt is initiated by dispersion of the melt into droplets by means of a gas stream.
Claim 15
Dependent Claim
26 words
The method of claim 11 wherein the cooling rate at the droplet surface is sufficient to retain 2.0-17.0% MgO in solid solution in the CaO phase.
Claim 16
Dependent Claim
27 words
The method of claim 12 wherein the cooling rate at the droplet surface is sufficient to retain about 2.3-7.5% MgO in solid solution in the CaO phase.
Claim 17
Dependent Claim
67 words
An improved method of producing a basic, fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO and 33-50% CaO, by a process of melting and solidifying a refractory raw material wherein the improvement comprises cooling the melt to induce solidification at a rate sufficient to retain at least 2% MgO in solid solution with the CaO phase throughout the fused refractory material.
Claim 18
Dependent Claim
67 words
An improved method of producing a basic, fused refractory material consisting essentially of, by weight on the oxide basis, 50-67% MgO and 33-50% CaO, by a process of melting and solidifying a refractory raw material wherein the improvement comprises cooling the melt to induce solidification at a rate sufficient to retain at least 2% MgO in solid solution with the CaO phase throughout the fused refractory material.
Claim 19
Dependent Claim
28 words
The method of producing fused refractory material according to claim 14 wherein the melted refractory batch is solidified on a chilled slab and is mechanically crushed after solidification.
Claim 20
Dependent Claim
29 words
The method of claim 15 wherein the cooling rate at any point in the melt is sufficient to retain about 2.3%-7.5% MgO in solid solution in the CaO phase.
Claim 21
Dependent Claim
25 words
The method of claim 16 wherein the cooling rate at any point in the melt is between about 2000 and 14,400 Centigrade degrees per hour.
Claim 22
Dependent Claim
25 words
The method of claim 14 wherein cooling of the melt is initiated by dispersion of the melt into droplets by means of a gas stream.
Claim 23
Dependent Claim
25 words
The method of claim 18 wherein the cooling rate throughout the droplet is sufficient to retain 2.0-17.0% MgO in solid solution in the CaO phase.
Claim 24
Dependent Claim
23 words
The method of claim 19 wherein the cooling rate is sufficient to retain about 2.3-7.5% MgO in solid solution in the CaO phase.
References Cited (Backward Citations)
US3332740A
Cited
US3262795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-01 | 1980-08-02 | 1981-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-01 | 1984-08-02 | 1985-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-01 | 1988-08-02 | 1989-02-01 | $7700.00 | Window Closed / Lapsed |