US3857702A
Expired / Lapsed
US
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Electroslag refining flux compositions and process for making same
Assignee: SCM Corp
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Filing: 1971-10-26
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Granted: 1974-12-31
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Expires: 1991-10-26
Abstract
Abstract An improved electroslag refining (ESR) flux composition and process for making same are shown. The instant ESR flux compositions are made from particulate batch materials providing at least alumina, a fluoride and alkaline earth metal oxide, including calcium oxide, by the process described to yield a product exhibiting a substantially uniform fusion characteristic and to be substantially free of contamination from outside sources. The improvement in process comprises subjecting a substantially homogeneous mixture of batch materials, advantageously pelletized, to heat reaction at a temperature short of their complete fusion and in the range of about 1,900*2,400* F, generally most suitably until the free calcium oxide in the resulting product is below about 1 1/2 %.
Inventors
- 👤 P Corbett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:34
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/16; C22B9/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
87 words
IN A PROCESS FOR PRODUCING AN ELECTROSLAG REFINING FLUX COMPOSITION FROM PARTICULATE BATH MATERIALS WHICH INCLUDES ALUMINA, FLURIDE, AND ALKALI EARTH METAL OXIDE, INCLUDING CALCIUM OXIDE, THE IMPROVEMENT WHICH COMPRISES: FORMING AN AGGLOMERATED SUBSTANTIALLY HOMOGENEOUS MIXTURE OF SAID BATCH MATERIALS AT A HEAT REACTION TEMPERATURE OF ABOUT 1,900*-2,400*F, BUT LESS THAN THE FUSION TEMPERATURE OF SAID BATCH MATERIALS, UNTIL A FLUX COMPOSITION IS FORMED HAVING A SUBSTANTIALLY UNIFORM FUSHION RANGE OF LESS THAN 150*F AND CONTAINING LESS THAN ABOUT 1.5% BY WEIGHT OF FREE, UNCOMBINED CALCIUM OXIDE.
Claim 2
Dependent Claim
87 words
IN A PROCESS FOR PRODUCING AN ELECTROSLAG REFINING FLUX COMPOSITION FROM PARTICULATE BATH MATERIALS WHICH INCLUDES ALUMINA, FLURIDE, AND ALKALI EARTH METAL OXIDE, INCLUDING CALCIUM OXIDE, THE IMPROVEMENT WHICH COMPRISES: FORMING AN AGGLOMERATED SUBSTANTIALLY HOMOGENEOUS MIXTURE OF SAID BATCH MATERIALS AT A HEAT REACTION TEMPERATURE OF ABOUT 1,900*-2,400*F, BUT LESS THAN THE FUSION TEMPERATURE OF SAID BATCH MATERIALS, UNTIL A FLUX COMPOSITION IS FORMED HAVING A SUBSTANTIALLY UNIFORM FUSHION RANGE OF LESS THAN 150*F AND CONTAINING LESS THAN ABOUT 1.5% BY WEIGHT OF FREE, UNCOMBINED CALCIUM OXIDE.
Claim 3
Dependent Claim
36 words
The process of claim 1 wherein the batch materials are solids having particle size finer than 60 mesh, and the free calcium oxide content in the resulting composition is not substantially above about 1 1/2 %.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the batch materials comprise fluorspar, calcium carbonate, and alumina.
Claim 5
Dependent Claim
17 words
The process of claim 3 where aluminum fluoride is at least partially substituted for flurospar and alumina.
Claim 6
Dependent Claim
13 words
The process of claim 3 where the batch materials also contain magnesium oxide.
Claim 7
Dependent Claim
20 words
The process of claim 1 where the batch materials are agglomerated to a predetermined size prior to their heat reaction.
Claim 8
Dependent Claim
81 words
An electroslag refining flux composition made of particles including combined or free alumina, a fluoride, and alkaline earth metal oxide, including calcium oxide, the improvement which comprises the substantially homogeneous solid state heat reaction product of said particles at temperatures of 1,900* to 2,400* F, said heat reaction product being unfused and agglomerated, said reaction product having less than 1.5% by weight free, uncombined calcium oxide, and said reaction product having a substantially uniform fushion range of less than 150* F.
Claim 9
Dependent Claim
81 words
An electroslag refining flux composition made of particles including combined or free alumina, a fluoride, and alkaline earth metal oxide, including calcium oxide, the improvement which comprises the substantially homogeneous solid state heat reaction product of said particles at temperatures of 1,900* to 2,400* F, said heat reaction product being unfused and agglomerated, said reaction product having less than 1.5% by weight free, uncombined calcium oxide, and said reaction product having a substantially uniform fushion range of less than 150* F.
Claim 10
Dependent Claim
22 words
The composition according to claim 7 wherein silica is limited to about 1%, sulfur to about 0.05%, and carbon to about 0.01%.
Claim 11
Dependent Claim
28 words
The composition according to claim 8 wherein silica is not substantially above about 3/4%, sulfur not substantially above about 0.01%, and carbon not substantially more than a trace.
Claim 12
Dependent Claim
23 words
The composition according to claim 7 wherein the product agglomerates are between about 1/32 inch and about 1/2 inch in their longest dimension.
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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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |