US4053320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of refractory articles
Assignee: Keeling and Walker Ltd
•
Filing: 1976-06-04
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Granted: 1977-10-11
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Expires: 1996-06-04
Abstract
Abstract The process for the production of a refractory body comprises comminuting plasma dissociated zircon sand, mixing the comminuted sand with a functional additive for the purpose of reducing the subsequent firing temperature, moulding the resulting mixture to form a body, and finally firing the moulded body until sintering occurs.
Inventors
- 👤 John Peter Hugh Williamson
- 👤 Harry Augustus Morriss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/481
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
29 words
A process for the production of a refractory body comprising comminuting plasma dissociated zircon sand, shaping the resulting comminuted sand and firing to form a body of single mass.
Claim 2
Dependent Claim
29 words
A process for the production of a refractory body comprising comminuting plasma dissociated zircon sand, shaping the resulting comminuted sand and firing to form a body of single mass.
Claim 3
Dependent Claim
25 words
A process according to claim 1, wherein the following comminution of the plasma dissociated zircon sand a functional additive is mixed therewith prior to shaping.
Claim 4
Dependent Claim
32 words
A process according to claim 1, wherein the plasma dissociated zircon sand is first mixed with a functional additive and the mixture ground to reduce the particle size of the zircon sand.
Claim 5
Dependent Claim
34 words
A process according to claim 1, wherein prior to shaping a functional additive is added comprising at least one of the group consisting of iron oxide, iron hydroxide, lime, magnesia, yttria, alumina and mullite.
Claim 6
Dependent Claim
16 words
A process according to claim 4, wherein other constituents are present in the form of binders.
Claim 7
Dependent Claim
27 words
A process according to claim 5, wherein the binders comprise at least one of the group consisting of wax emulsions, water soluble polymeric binders, clays and frits.
Claim 8
Dependent Claim
25 words
A process according to claim 1, wherein the plasma dissociated sand is comminuted to a particle size of between 200 and 350 mesh (British Standard).
Claim 9
Dependent Claim
24 words
A process according to claim 1, wherein the plasma dissociated sand is comminuted to a particle size of less than 350 mesh (British Standard).
Claim 10
Dependent Claim
24 words
A process according to claim 1, wherein the comminution of the plasma dissociated zircon sand is effected under dry conditions in a ball mill.
Claim 11
Dependent Claim
23 words
A process according to claim 1, wherein the comminution of the plasma-dissociated zircon sand takes place under wet conditions in a ball mill.
Claim 12
Dependent Claim
29 words
A process according to claim 10, wherein the wet milling is carried out in the presence of an additive which reacts with the silica constituent of the dissociated zircon.
Claim 13
Dependent Claim
45 words
A process according to claim 11 wherein the additive is selected from the group consisting of caustic soda, caustic potash, sodium silicate potassium silicate, hydrofluoric acid, sodium bifluoride, potassium bifluoride, ammonium bifluoride, ammonium fluoride and an alkali metal fluoride in the presence of hydrofluoric acid.
Claim 14
Dependent Claim
13 words
A process according to claim 11, wherein the additive is neutralised after milling.
Claim 15
Dependent Claim
24 words
A process according to claim 1, wherein the plasma dissociated zircon sand when comminuted has an average specific gravity of between 3.5 and 4.0.
Claim 16
Dependent Claim
18 words
A process according to claim 1, wherein the plasma dissociated sand contains up to 80% weight dissociated grains.
Claim 17
Dependent Claim
38 words
A process according to claim 15, wherein the plasma dissociated zircon sand consists of 50% to 98% weight fully fused particles of dissociated zircon, 2% to 35% weight partially dissociated particles and 0 to 15% weight undissociated grains.
Claim 18
Dependent Claim
18 words
A process according to claim 11 wherein the resulting slurry contains soluble constituents which are removed by washing.
Claim 19
Dependent Claim
12 words
A process according to claim 11, wherein the resulting slurry is dried.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |