GB1580492A - Process for the manufacture of vanadium carbide containing material of low sulphur content - Google Patents
Process for the manufacture of vanadium carbide containing material of low sulphur content Download PDFInfo
- Publication number
- GB1580492A GB1580492A GB26795/77A GB2679577A GB1580492A GB 1580492 A GB1580492 A GB 1580492A GB 26795/77 A GB26795/77 A GB 26795/77A GB 2679577 A GB2679577 A GB 2679577A GB 1580492 A GB1580492 A GB 1580492A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carbon
- vanadium
- sulfur
- sized
- combined
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C35/00—Master alloys for iron or steel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
- Silicon Compounds (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
Abstract
The materials containing vanadium and carbon are employed for the manufacture of certain steels. These materials are prepared by heating a mixture of vanadium oxide and carbon in vacuum. These substances also contain sulphur present as impurity in the starting carbon and impairing the qualities of the steels. Using the present process the sulphur content is reduced by adding silicon, silica or tin to the mixture.
Description
(54) PROCESS FOR THE MANUFACTURE OF VANADIUM CARBIDE
CONTAINING MATERIAL OF LOW SULFUR CONTENT
(71) We, UNION CARBIDE CORPORA
TION, a corporation organized and existing under the laws of the State of New York,
United States of America, whose registered office is, 270 Park Avenue, New York, State of New York 10017, United States of
America, (assignee of James Herbert Downing and Rodney Francis Merkert), do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention is directed to a method for producing a vanadium and carbide containing material having a sulfur content lower than that of the starting mixture.
Vanadium-carbon materials of the type noted above are produced by the high temperature vacuum furnacing of vanadium oxide and carbon as described for example in U.S. Patent 3,334,992-J. H. Downing and R. F. Merkert, the disclosure of this patent being incorporated herein by reference.
The vanadium-carbon materials disclosed in the above-noted patent are produced by a method which includes the steps of mixing of V203 and carbon, compacting the mixture into briquets and vacuum furnacing the mixture at elevated temperatures, e.g.
1200"C to 14000C at a pressure of less than about 300 microns, to produce a product in which is substantially all in the form of combined vanadium and carbon. This material is widely used as a vanadium source addition to molten steel. It has been found that the sulfur content of such vanadiumcarbon product is on the order of about 1/3 sulfur content of the starting mixture of V203 and carbon, the sulfur content of the starting mixture being essentially due to the sulfur content of the carbon source, e.g.
coal, carbon black and the like.
Since it is undesirable to add sulfur impurities to steel, it is important to lower the sulfur content of vanadium-carbon materials as described above, particularly when low sulfur carbon materials are not readily available.
According to the present invention there is provided a process for the manufacture of a vanadium and carbon containing material at least 80% by weight being in the form of combined vanadium and carbon with the predominant proportion of combined vanadium being in the form of V2C and the atomic ratio of vanadium to carbon being in the range of 1.49 to 2.42, which comprises vacuum furnacing a mixture of vanadium oxide and a carbon source material containing sulfur, which mixture prior to furnacing thereof, includes at least one material selected from elemental silicon, silica and metallic tin.
By utilising the process of the invention a vanadium and carbon containing material is obtained which has a sulfur content substantially lower than that of the starting materials and also lower than that of vanadium-carbon materials produced under similar conditions but excluding the elemental silicon, silica or metallic tin.
In the practice of a particular embodiment of the present invention, a mixture of finely divided V203 and carbon is prepared and at least one of a finely divided material selected from the group of silicon, silica and tin is included in the mixture. The aggregate amount selected material is preferably from about 1 to 5 times the weight of sulfur in the carbon constituent of mixture. The mixture is thereafter briquetted and subjected to a temperature in the range of about 12000C to 14000C in a vacuum furnace wherein the mixture constituents are reacted, the reaction being completed at a pressure of less than about 300 microns; the reaction time being sufficient to cause the carbon and V203 to combine and form a product which is at least 80% by weight in the form of combined vanadium and carbon. The sulfur content of thus produced material will be less than about 0.05% by weight.
The present invention will now be further illustrated by way of the following
Examples. The mesh sizes in the examples are U.S. Screen Series.
EXAMPLE I (Comparative)
A mix was prepared containing 1000 lbs.
of V203 sized -2 , 335 Ibs. of petroleum coke containing 0.65% sulfur sized - 2 , 20 Ibs. of Mogul* binder and 23% water based on dry weight ("Mogul" is a Trademark of Corn Products Company). Briquets sized 14" X I X 1" were prepared from the mix by pressing in a K-G roll briquet press and drying at 2250F. The resulting briquets, in the amount of 3 lbs., were charged to a vacuum furnace having interior working dimensions of 7" x 12" x 40".
The pressure in the furnace was reduced to 175 microns and the furnace was heated to about 1400"C. Due to evolution of CO the pressure rose to about 1600 microns. After about 8 hours at 14000C the pressure dropped to 100 microns and the furnace contents were then cooled to room temperature under a positive pressure of argon. The product briquets analyzed 8.49% combined carbon and 0.18% sulfur.
EXAMPLE 11
Essentially the same procedure as in
Example I was followed, except that the mix contained 1.7% silicon sized 200 M X D.
The resulting briquets contained 7.94% combined carbon and 0.013% sulfur.
EXAMPLE 111
Essentially the same procedure as in
Example I was followed, except that the mix contained 0.5% tin sized 100 M x D.
The resulting briquets contained 7.44% combined carbon and 0.042% sulfur.
EXAMPLE IV
Essentially the same procedure as in
Example I was followed, except that the mix contained 3.6% SiO2 sized 200 M X D.
The resulting briquets contained 9.34% combined carbon and 0.012% sulfur.
WHAT WE CLAIM IS:
1. A process for the manufacture of a vanadium and carbon containing material at least 80% by weight being in the form of combined vanadium and carbon with the predominant proportion of combined vanadium being in the form of V2C and the atomic ratio of vanadium to carbon being in the range of 1.49 to 2.42, which comprises vacuum furnacing a mixture of vanadium oxide and a carbon source material containing sulfur, which mixture prior to furnacing thereof, includes at least one material selected from elemental silicon, silica and metallic tin.
2. A method as claimed in claim 1 wherein the aggregate amount of selected material is from about 1 to 5 times by weight the amount of sulfur in the mixture of vanadium oxide and carbon.
3. A method as claimed in claim 1 or claim 2 wherein said selected material is silicon.
4. A method as claimed in claim 1 or claim 2 wherein said selected material is silica.
5. A method as claimed in claim 1 or claim 2 wherein said selected material is tin.
6. A method as claimed in claim 1 substantially as hereinbefore described with reference to any one of Examples 2 to 4.
7. A vanadium and carbon containing material whenever manufactured by a process as claimed in any one of claims 1 to 6.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (7)
1. A process for the manufacture of a vanadium and carbon containing material at least 80% by weight being in the form of combined vanadium and carbon with the predominant proportion of combined vanadium being in the form of V2C and the atomic ratio of vanadium to carbon being in the range of 1.49 to 2.42, which comprises vacuum furnacing a mixture of vanadium oxide and a carbon source material containing sulfur, which mixture prior to furnacing thereof, includes at least one material selected from elemental silicon, silica and metallic tin.
2. A method as claimed in claim 1 wherein the aggregate amount of selected material is from about 1 to 5 times by weight the amount of sulfur in the mixture of vanadium oxide and carbon.
3. A method as claimed in claim 1 or claim 2 wherein said selected material is silicon.
4. A method as claimed in claim 1 or claim 2 wherein said selected material is silica.
5. A method as claimed in claim 1 or claim 2 wherein said selected material is tin.
6. A method as claimed in claim 1 substantially as hereinbefore described with reference to any one of Examples 2 to 4.
7. A vanadium and carbon containing material whenever manufactured by a process as claimed in any one of claims 1 to 6.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US70047276A | 1976-06-28 | 1976-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1580492A true GB1580492A (en) | 1980-12-03 |
Family
ID=24813628
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB26795/77A Expired GB1580492A (en) | 1976-06-28 | 1977-06-27 | Process for the manufacture of vanadium carbide containing material of low sulphur content |
Country Status (27)
Country | Link |
---|---|
JP (1) | JPS532400A (en) |
AR (1) | AR214412A1 (en) |
AT (1) | AT361228B (en) |
AU (1) | AU504846B2 (en) |
BE (1) | BE856156A (en) |
BR (1) | BR7704155A (en) |
CA (1) | CA1096135A (en) |
CH (1) | CH622289A5 (en) |
CS (1) | CS207461B2 (en) |
DD (1) | DD131743A5 (en) |
DE (1) | DE2727559A1 (en) |
DK (1) | DK284377A (en) |
ES (1) | ES460122A1 (en) |
FI (1) | FI69317C (en) |
FR (1) | FR2356734A1 (en) |
GB (1) | GB1580492A (en) |
HU (1) | HU176035B (en) |
IN (1) | IN147296B (en) |
IT (1) | IT1079718B (en) |
LU (1) | LU77619A1 (en) |
MX (1) | MX145912A (en) |
NO (1) | NO151752C (en) |
PH (1) | PH13010A (en) |
PL (1) | PL111609B1 (en) |
SE (1) | SE440795B (en) |
YU (1) | YU40002B (en) |
ZA (1) | ZA773579B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ229777A (en) * | 1989-12-30 | 1991-08-27 | Nz Government | Method for manufacturing ceramic-metal composites |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2576763A (en) * | 1950-03-22 | 1951-11-27 | Climax Molybdenum Co | Vanadium containing briquettes |
FR1422683A (en) * | 1965-01-26 | 1965-12-24 | Union Carbide Corp | Adding agent containing vanadium and its manufacturing process |
FR1471448A (en) * | 1966-03-10 | 1967-03-03 | Vanadium Corp Of America | Manufacturing process of vanadium carbide briquettes |
FR1562736A (en) * | 1967-05-29 | 1969-04-04 | ||
US3982924A (en) * | 1971-05-26 | 1976-09-28 | Reading Alloys, Inc. | Process for producing carbide addition agents |
-
1977
- 1977-06-14 ZA ZA00773579A patent/ZA773579B/en unknown
- 1977-06-17 CA CA280,822A patent/CA1096135A/en not_active Expired
- 1977-06-18 DE DE19772727559 patent/DE2727559A1/en not_active Ceased
- 1977-06-23 YU YU1561/77A patent/YU40002B/en unknown
- 1977-06-27 DD DD7700199724A patent/DD131743A5/en unknown
- 1977-06-27 CS CS774235A patent/CS207461B2/en unknown
- 1977-06-27 CH CH785677A patent/CH622289A5/en not_active IP Right Cessation
- 1977-06-27 FR FR7719641A patent/FR2356734A1/en active Granted
- 1977-06-27 SE SE7707391A patent/SE440795B/en not_active IP Right Cessation
- 1977-06-27 ES ES460122A patent/ES460122A1/en not_active Expired
- 1977-06-27 IN IN955/CAL/77A patent/IN147296B/en unknown
- 1977-06-27 HU HU77UI262A patent/HU176035B/en unknown
- 1977-06-27 GB GB26795/77A patent/GB1580492A/en not_active Expired
- 1977-06-27 AT AT452477A patent/AT361228B/en not_active IP Right Cessation
- 1977-06-27 IT IT49992/77A patent/IT1079718B/en active
- 1977-06-27 PH PH19917A patent/PH13010A/en unknown
- 1977-06-27 AR AR268200A patent/AR214412A1/en active
- 1977-06-27 AU AU26488/77A patent/AU504846B2/en not_active Expired
- 1977-06-27 BR BR7704155A patent/BR7704155A/en unknown
- 1977-06-27 JP JP7643677A patent/JPS532400A/en active Granted
- 1977-06-27 MX MX169642A patent/MX145912A/en unknown
- 1977-06-27 LU LU77619A patent/LU77619A1/xx unknown
- 1977-06-27 FI FI771991A patent/FI69317C/en not_active IP Right Cessation
- 1977-06-27 NO NO772268A patent/NO151752C/en unknown
- 1977-06-27 PL PL1977199196A patent/PL111609B1/en unknown
- 1977-06-27 DK DK284377A patent/DK284377A/en not_active Application Discontinuation
- 1977-06-27 BE BE178819A patent/BE856156A/en not_active IP Right Cessation
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |