CA2500611A1 - Method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles - Google Patents
Method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles Download PDFInfo
- Publication number
- CA2500611A1 CA2500611A1 CA002500611A CA2500611A CA2500611A1 CA 2500611 A1 CA2500611 A1 CA 2500611A1 CA 002500611 A CA002500611 A CA 002500611A CA 2500611 A CA2500611 A CA 2500611A CA 2500611 A1 CA2500611 A1 CA 2500611A1
- Authority
- CA
- Canada
- Prior art keywords
- ladle
- slag pot
- metal
- slag
- sticker
- 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.)
- Abandoned
Links
- 239000002893 slag Substances 0.000 title claims abstract description 82
- 239000002184 metal Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 25
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 title description 27
- 239000007789 gas Substances 0.000 claims abstract description 19
- 230000008014 freezing Effects 0.000 claims abstract description 10
- 238000007710 freezing Methods 0.000 claims abstract description 10
- 230000035939 shock Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 15
- 239000007788 liquid Substances 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- 238000009628 steelmaking Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 239000005336 safety glass Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/001—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like devices for cleaning ladles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
A method of removing a metal sticker from a metal slag pot ladle. A step is taken of injecting cryogenic freezing gases into the ladle, while taking care to avoid contact of the freezing gases with interior walls of the ladle. A step is then taken of lowering a temperature of the metal sticker until the metal sticker shrinks and pulls away from the interior walls of the ladle.
Description
TITLE OF THE INVENTION:
Method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles FIELD OF THE INVENTION
The present invention relates to a method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles and associated vessels.
BACKGROUND OF THE INVENTION
In the steel making industry use is made of the slag pot ladles, these slag pot ladles are made of ferrous metal and are used to carry slag deposits from steel making furnaces. The slag pot ladles are prepared by partially filling the slag pot ladles with slag to prevent non-ferrous or ferrous metal deposits mixed with the slag that are poured into the ladles during the operation of removing slag from the steel making furnaces, these non-ferrous or ferrous metal deposits at times become fused to the interior surface of the slag pot ladle.
In order to return the slag pot ladles back into service the fused non-ferrous or ferrous metal stickers must be removed from the interior of the slag pot ladle. At the present time the removal of the fused non-ferrous or ferrous metal sticker is performed by oxygen lancing.
Method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles FIELD OF THE INVENTION
The present invention relates to a method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles and associated vessels.
BACKGROUND OF THE INVENTION
In the steel making industry use is made of the slag pot ladles, these slag pot ladles are made of ferrous metal and are used to carry slag deposits from steel making furnaces. The slag pot ladles are prepared by partially filling the slag pot ladles with slag to prevent non-ferrous or ferrous metal deposits mixed with the slag that are poured into the ladles during the operation of removing slag from the steel making furnaces, these non-ferrous or ferrous metal deposits at times become fused to the interior surface of the slag pot ladle.
In order to return the slag pot ladles back into service the fused non-ferrous or ferrous metal stickers must be removed from the interior of the slag pot ladle. At the present time the removal of the fused non-ferrous or ferrous metal sticker is performed by oxygen lancing.
2 0 This oxygen lancing is conducted by using time consuming, physical manpower, consisting of numerous workers entering into the slag pot ladle and cutting the fused non-ferrous or ferrous metal sticker from the slag pot. This cutting process commonly damages the interior of the slag pot ladle, creating damage to the interior surface of slag pot ladle.
This current process exposes workers to unnecessary health & safety risks due to lancing gases and hot molten 2 5 metal. During the lancing process, gases, and toxic brown fumes are released into the atmosphere creating a negative environmental impact. It is difficult to predict when the slag pot ladle will be returned to service due to the varied characteristics of the fused non-ferrous or ferrous metal.
SUMMARY OF THE INVENTION
According to the present invention there is provided a method of removing a metal sticker from a metal slag pot ladle. A step is taken of injecting cryogenic freezing gases into the ladle, while taking care to avoid contact of the freezing gases with interior walls of the slag pot ladle. A step is then taken of lowering a temperature of the metal sticker until the metal sticker shrinks and pulls away from the interior walls of the slag pot ladle.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIG. 1 is a side elevation view, in section, of slag pot ladle requiring treatment in accordance with the teachings of the present method.
FIG. 2 is a side elevation view, in section, of the slag pot ladle illustrated in FIG. 1, with temperature probes attached FIG. 3 is a side elevation view, in section, of the slag pot ladle illustrated in FIG. 2, with hose line and diffuser attached.
2 0 FIG. 4 is a side elevation view, in section, of the slag pot ladle illustrated in FIG. 3, after cryogenic treatment.
FIG. 5 is a side elevation view, in section, of the slag pot ladle illustrated in FIG. 4, with the metal stick being dumped from the slag pot ladle after cryogenic treatment.
FIG. 6 is flow diagram representation of the removal of a fused non-ferrous or ferrous 2 5 metal sticker in accordance with the teachings of the present method.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred method of removing fused non-ferrous or ferrous metal stickers from slag pot ladles will now be described with reference to FIG. 1 through FIG. 6.
This current process exposes workers to unnecessary health & safety risks due to lancing gases and hot molten 2 5 metal. During the lancing process, gases, and toxic brown fumes are released into the atmosphere creating a negative environmental impact. It is difficult to predict when the slag pot ladle will be returned to service due to the varied characteristics of the fused non-ferrous or ferrous metal.
SUMMARY OF THE INVENTION
According to the present invention there is provided a method of removing a metal sticker from a metal slag pot ladle. A step is taken of injecting cryogenic freezing gases into the ladle, while taking care to avoid contact of the freezing gases with interior walls of the slag pot ladle. A step is then taken of lowering a temperature of the metal sticker until the metal sticker shrinks and pulls away from the interior walls of the slag pot ladle.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIG. 1 is a side elevation view, in section, of slag pot ladle requiring treatment in accordance with the teachings of the present method.
FIG. 2 is a side elevation view, in section, of the slag pot ladle illustrated in FIG. 1, with temperature probes attached FIG. 3 is a side elevation view, in section, of the slag pot ladle illustrated in FIG. 2, with hose line and diffuser attached.
2 0 FIG. 4 is a side elevation view, in section, of the slag pot ladle illustrated in FIG. 3, after cryogenic treatment.
FIG. 5 is a side elevation view, in section, of the slag pot ladle illustrated in FIG. 4, with the metal stick being dumped from the slag pot ladle after cryogenic treatment.
FIG. 6 is flow diagram representation of the removal of a fused non-ferrous or ferrous 2 5 metal sticker in accordance with the teachings of the present method.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred method of removing fused non-ferrous or ferrous metal stickers from slag pot ladles will now be described with reference to FIG. 1 through FIG. 6.
Referring to FIG. 3, a gas diffuser 12 is placed over a metal sticker 14 stuck to slag pot ladle 16. Gas diffuser 12 is part of a cryogenic gas injection system, which includes a hose 18, which leads to a cryogenic gas source (not shown). Cryogenic freezing gases, such as liquid nitrogen, are injected into slag pot ladle 16, while taking care to avoid contact of the freezing gases with interior walls 20 of slag pot ladle 16. Referring to FIG.
4, a temperature of metal sticker 14 is lowered to below -80 degrees Celsius, until metal sticker 14 shrinks and pulls away from interior walls 20 of slag pot ladle 16. The temperature of slag pot ladle 16 is monitored by means of temperature probes 21. It will be appreciated, that the pulling away from interior walls 20 is a product of time and temperature. It may take twenty four hours at -80 degrees Celsius, and considerably less time at -196 degrees Celsius. The temperature is lowered gradually in order to avoid thermal shock to slag pot ladle 16.
Referring to FIG. 5, metal sticker 14 is then taken and dumped from slag pot ladle 16.
The preferred method involves subjecting a non-ferrous or ferrous sticker from a slag pot ladle or associated vessels, having a surface which is fused to the slag pot until the fused sticker pulls away from the slag pot ladle. The Cryogenic temperature range starts at approximately -80 degrees Celsius. It will be understood that the method works with a combination of temperature and time. As the temperature is reduced within the Cryogenic 2 0 temperature range the less time it takes for the fused sticker to pull away from the interior surface. In test proving the concept, a temperature range between -80 degrees Celsius and -196 degrees Celsius was used. In order to avoid thermal shock of the slag pot ladle, the temperature of the slag pot ladle sticker must be gradually brought down into the Cryogenic range and cryogenic liquid/gas must be statically injected onto fused sticker.
In tests proving 2 5 the concept the slag pot ladle sticker was brought down gradually at strategic points through the injection system to avoid Cryogenic Nitrogen/gas from contacting the slag ladle interior walls. There was dwell time of approximately two to twenty-four hours depending upon the temperature used. Once the sticker is separated from the interior wall removal of the fused sticker becomes an extremely simple matter.
The present method of removing fused non-ferrous or ferrous metal from the slag pot ladle simplifies the removal, reduces the environmental impact, health risk exposure and lowers the cost of removal.
Operation in accordance with the Flow Chart set forth in FIG. 6 will now be described with reference to FIG. 1 through FIG. 5.
Sticker Removal from Melting Slay Ladle 1. Ensure the required liquid nitrogen (Ln2) storage tank level is adequate for the removal process.
Measure the amount contained in the tank by visually reading the gauge.
D Work out an estimated flow rate vs. estimated time of introduction. This will provide an estimated amount required to complete the process.
Note: Keep in mind both the atmospheric temperature and the starting slag ladle and sticker temperature.
2. Referring to FIG. 1, conduct a joint inspection of the intended slag ladle 16.
Each slag ladle must have a joint inspection consisting of the client representative and either the Cryogenic operator or supervisor.
2 0 ~ Any cracks or abnormal markings must be documented.
Cracks must be measured in imperial measurement and documented.
3. Once the slag ladle 16 has been delivered to the Cryogenic area, prepare the slag ladle area for the process 2 5 ~ Area must be flagged off and identified with caution tape.
Only workers assigned to the Cryogenic process are permitted in the immediate area.
D Visitors must sign in and be escorted into the area by the Cryogenic operator to view the operation.
Access to area is the Cryogenic operator responsibility.
4. Referring to FIG. 2, apply the temperature probes 21 to the slag ladle 16, using a hand grinder.
Referring to FIG. 5, metal sticker 14 is then taken and dumped from slag pot ladle 16.
The preferred method involves subjecting a non-ferrous or ferrous sticker from a slag pot ladle or associated vessels, having a surface which is fused to the slag pot until the fused sticker pulls away from the slag pot ladle. The Cryogenic temperature range starts at approximately -80 degrees Celsius. It will be understood that the method works with a combination of temperature and time. As the temperature is reduced within the Cryogenic 2 0 temperature range the less time it takes for the fused sticker to pull away from the interior surface. In test proving the concept, a temperature range between -80 degrees Celsius and -196 degrees Celsius was used. In order to avoid thermal shock of the slag pot ladle, the temperature of the slag pot ladle sticker must be gradually brought down into the Cryogenic range and cryogenic liquid/gas must be statically injected onto fused sticker.
In tests proving 2 5 the concept the slag pot ladle sticker was brought down gradually at strategic points through the injection system to avoid Cryogenic Nitrogen/gas from contacting the slag ladle interior walls. There was dwell time of approximately two to twenty-four hours depending upon the temperature used. Once the sticker is separated from the interior wall removal of the fused sticker becomes an extremely simple matter.
The present method of removing fused non-ferrous or ferrous metal from the slag pot ladle simplifies the removal, reduces the environmental impact, health risk exposure and lowers the cost of removal.
Operation in accordance with the Flow Chart set forth in FIG. 6 will now be described with reference to FIG. 1 through FIG. 5.
Sticker Removal from Melting Slay Ladle 1. Ensure the required liquid nitrogen (Ln2) storage tank level is adequate for the removal process.
Measure the amount contained in the tank by visually reading the gauge.
D Work out an estimated flow rate vs. estimated time of introduction. This will provide an estimated amount required to complete the process.
Note: Keep in mind both the atmospheric temperature and the starting slag ladle and sticker temperature.
2. Referring to FIG. 1, conduct a joint inspection of the intended slag ladle 16.
Each slag ladle must have a joint inspection consisting of the client representative and either the Cryogenic operator or supervisor.
2 0 ~ Any cracks or abnormal markings must be documented.
Cracks must be measured in imperial measurement and documented.
3. Once the slag ladle 16 has been delivered to the Cryogenic area, prepare the slag ladle area for the process 2 5 ~ Area must be flagged off and identified with caution tape.
Only workers assigned to the Cryogenic process are permitted in the immediate area.
D Visitors must sign in and be escorted into the area by the Cryogenic operator to view the operation.
Access to area is the Cryogenic operator responsibility.
4. Referring to FIG. 2, apply the temperature probes 21 to the slag ladle 16, using a hand grinder.
5 ~ Appropriate safety equipment, safety glasses in addition to a grinding shield are required when grinding a clean surface on the slag ladle.
When probes are attached to the side of the slag ladle, muffler tape is used as the optimum fastener. Gloves must be used at this stage.
5. Record the starting temperatures.
Using the temperature measuring units, starting values must be taken.
Slag ladle temperatures must be below 80 degrees Celsius before the Cryogenic process begins.
When probes are attached to the side of the slag ladle, muffler tape is used as the optimum fastener. Gloves must be used at this stage.
5. Record the starting temperatures.
Using the temperature measuring units, starting values must be taken.
Slag ladle temperatures must be below 80 degrees Celsius before the Cryogenic process begins.
6. Record all history for the slag pot ladle.
Slag ladle history should consist of the time the slag ladle has been out of service, sticker history, level of the sticker, sticker composition 7. Referring to FIG. 3, insert the Diffuser 12 into the slag ladle 16.
~ Keep area clear while lifting diffuser into the slag ladle.
Slag ladle history should consist of the time the slag ladle has been out of service, sticker history, level of the sticker, sticker composition 7. Referring to FIG. 3, insert the Diffuser 12 into the slag ladle 16.
~ Keep area clear while lifting diffuser into the slag ladle.
8. Introduce liquid nitrogen (Ln2) through the diffuser 12.
Note: Lower temperatures may be found in areas of the slag ladle.
2 5 D Introduction of Ln2 should be slow at the beginning with liquid being visible in 2 to 3 minutes of introduction.
Once the liquid nitrogen (Ln2) is visible on the top of the sticker top, liquid nitrogen (Ln2 should flow enough to maintain a full bowl into the identified pockets on the top of the sticker. The Ln2 should be allowed to boil off enough within the pockets to prevent any Ln2 to roll off the sticker onto the slag ladle but to maintain the bowl effect.
D Note: (Ln2 must not roll onto any slag ladle surface) D Note: The diffuser may have to be re-positioned away from the identified area.
Note: Lower temperatures may be found in areas of the slag ladle.
2 5 D Introduction of Ln2 should be slow at the beginning with liquid being visible in 2 to 3 minutes of introduction.
Once the liquid nitrogen (Ln2) is visible on the top of the sticker top, liquid nitrogen (Ln2 should flow enough to maintain a full bowl into the identified pockets on the top of the sticker. The Ln2 should be allowed to boil off enough within the pockets to prevent any Ln2 to roll off the sticker onto the slag ladle but to maintain the bowl effect.
D Note: (Ln2 must not roll onto any slag ladle surface) D Note: The diffuser may have to be re-positioned away from the identified area.
9. Monitor temperature of slag pot ladle.
D Operator must continually monitor the temperatures of the slag pot ladle by recording each temperature probe every half hour.
D Operator must physically monitor the radiant temperature of the slag pot ladle by walking around the slag pot ladle feeling for temperature variation. (Caution must be taken when the slag pot ladle is hot enough to burn the skin.
D Hot areas are most typically found at the bottom of the slag pot ladle, decreasing in temperature as you work your way to the top.) 10. Record "popping" or sticker "cracking" sounds.
D Operator must record all abnormal occurrences.
I I. Slag pot ladle dumping D Once cryogenic process is complete arrange for slag pot ladle dumping I I . Escort of the slag ladle carrier.
2 5 D The slag pot ladle will be moved to the dumping area, following all safety procedure in place at the site 12. Referring to FIG. 5, the dumping of the slag ladle.
13. Record and document Cryogenic operator must visualize and document the time the sticker had been dumped and number of attempts to dump.
Any other pertinent notes will be taken at this time.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded.
A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
D Operator must continually monitor the temperatures of the slag pot ladle by recording each temperature probe every half hour.
D Operator must physically monitor the radiant temperature of the slag pot ladle by walking around the slag pot ladle feeling for temperature variation. (Caution must be taken when the slag pot ladle is hot enough to burn the skin.
D Hot areas are most typically found at the bottom of the slag pot ladle, decreasing in temperature as you work your way to the top.) 10. Record "popping" or sticker "cracking" sounds.
D Operator must record all abnormal occurrences.
I I. Slag pot ladle dumping D Once cryogenic process is complete arrange for slag pot ladle dumping I I . Escort of the slag ladle carrier.
2 5 D The slag pot ladle will be moved to the dumping area, following all safety procedure in place at the site 12. Referring to FIG. 5, the dumping of the slag ladle.
13. Record and document Cryogenic operator must visualize and document the time the sticker had been dumped and number of attempts to dump.
Any other pertinent notes will be taken at this time.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded.
A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (5)
1. A method of removing a metal sticker from a metal slag pot ladle and associated vessels, comprising the steps of:
injecting cryogenic freezing gases into the slag pot ladle, while taking care to avoid contact of the freezing gases with interior walls of the ladle; and lowering a temperature of the metal sticker until the metal sticker shrinks and pulls away from the interior walls of the slag pot ladle.
injecting cryogenic freezing gases into the slag pot ladle, while taking care to avoid contact of the freezing gases with interior walls of the ladle; and lowering a temperature of the metal sticker until the metal sticker shrinks and pulls away from the interior walls of the slag pot ladle.
2. The method as defined in Claim 1, the metal sticker temperature being lowered gradually in order to avoid thermal shock to the slag pot ladle.
3.~The method as defined in Claim 1, the metal sticker being subjected to temperatures between -80 degrees Celsius and -196 degrees Celsius.
4. ~The method as defined in Claim 1, including a step of dumping the metal sticker from the slag pot ladle.
5. ~A method of removing metal stickers from a metal slag pot ladle, comprising the steps of:
placing a cryogenic gas injection system over the metal sticker;
injecting cryogenic freezing gases into the ladle, while taking care to avoid contact of the freezing gases with interior walls of the slag pot ladle;
lowering a temperature of the metal sticker to below -80 degrees Celsius until the metal sticker shrinks and pulls away from the interior walls of the slag pot ladle, the temperature being lowered gradually in order to avoid thermal shock to the slag pot ladle; and dumping the metal sticker from the slag pot ladle.
placing a cryogenic gas injection system over the metal sticker;
injecting cryogenic freezing gases into the ladle, while taking care to avoid contact of the freezing gases with interior walls of the slag pot ladle;
lowering a temperature of the metal sticker to below -80 degrees Celsius until the metal sticker shrinks and pulls away from the interior walls of the slag pot ladle, the temperature being lowered gradually in order to avoid thermal shock to the slag pot ladle; and dumping the metal sticker from the slag pot ladle.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002500611A CA2500611A1 (en) | 2005-03-04 | 2005-03-04 | Method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles |
| US11/368,345 US20060207694A1 (en) | 2005-03-04 | 2006-03-03 | Method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002500611A CA2500611A1 (en) | 2005-03-04 | 2005-03-04 | Method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2500611A1 true CA2500611A1 (en) | 2006-09-04 |
Family
ID=36955303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002500611A Abandoned CA2500611A1 (en) | 2005-03-04 | 2005-03-04 | Method of removing the fused non-ferrous or ferrous metal stickers from slag pot ladles |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US20060207694A1 (en) |
| CA (1) | CA2500611A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117626289A (en) * | 2023-12-07 | 2024-03-01 | 承德天大钒业有限责任公司 | A method for removing adherent matter from the surface of master alloy ingot using an outside-furnace method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4409034A (en) * | 1981-11-24 | 1983-10-11 | Mobile Companies, Inc. | Cryogenic cleaning process |
| US4627197A (en) * | 1983-12-08 | 1986-12-09 | Air Products And Chemicals, Inc. | Process control for cryogenic decoating |
| US4705574A (en) * | 1985-02-04 | 1987-11-10 | Mg Industries, Inc. | Debonding process for removing non-metallic coatings from metal hangers |
| DE3619788A1 (en) * | 1986-06-12 | 1987-12-17 | Messer Griesheim Gmbh | DEVICE FOR COOLING GUMMED LARGE TANKS WITH LIQUID NITROGEN |
| US4871651A (en) * | 1988-06-27 | 1989-10-03 | Ford Motor Copmpany | Cryogenic process for metal lift-off |
| EP1321625B1 (en) * | 2001-12-21 | 2004-09-22 | Siemens Aktiengesellschaft | Method for removing a metallic layer |
| US20030140950A1 (en) * | 2002-01-29 | 2003-07-31 | Kim Yang Geun | Cryogenic methods for removing lead based paints from large steel structure |
| US7264679B2 (en) * | 2004-02-11 | 2007-09-04 | Applied Materials, Inc. | Cleaning of chamber components |
| CA2500614A1 (en) * | 2005-03-04 | 2006-09-04 | Quadra Industrial Services Ontario Inc. | Method of treating tundish |
-
2005
- 2005-03-04 CA CA002500611A patent/CA2500611A1/en not_active Abandoned
-
2006
- 2006-03-03 US US11/368,345 patent/US20060207694A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20060207694A1 (en) | 2006-09-21 |
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Effective date: 20130429 |