CN115654490A - Protective gas supply device for oxygen-free copper rod production - Google Patents
Protective gas supply device for oxygen-free copper rod production Download PDFInfo
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- CN115654490A CN115654490A CN202211345936.9A CN202211345936A CN115654490A CN 115654490 A CN115654490 A CN 115654490A CN 202211345936 A CN202211345936 A CN 202211345936A CN 115654490 A CN115654490 A CN 115654490A
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- Prior art keywords
- gas
- oxygen
- free copper
- copper rod
- cooling device
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- 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.)
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 51
- 239000010949 copper Substances 0.000 title claims abstract description 51
- 230000001681 protective effect Effects 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 239000007789 gas Substances 0.000 claims abstract description 135
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 49
- 238000002485 combustion reaction Methods 0.000 claims abstract description 40
- 238000009826 distribution Methods 0.000 claims abstract description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 22
- 239000001257 hydrogen Substances 0.000 claims abstract description 22
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 22
- 239000003345 natural gas Substances 0.000 claims abstract description 20
- 238000003860 storage Methods 0.000 claims abstract description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 32
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000005096 rolling process Methods 0.000 claims description 13
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 12
- 239000001569 carbon dioxide Substances 0.000 claims description 9
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 9
- OTMSDBZUPAUEDD-UHFFFAOYSA-N Ethane Chemical compound CC OTMSDBZUPAUEDD-UHFFFAOYSA-N 0.000 claims description 6
- 239000001273 butane Substances 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 6
- 239000001294 propane Substances 0.000 claims description 6
- 150000002431 hydrogen Chemical class 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 9
- 239000001301 oxygen Substances 0.000 abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 abstract description 9
- 230000004224 protection Effects 0.000 abstract description 4
- 239000003570 air Substances 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000009979 protective mechanism Effects 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
Abstract
The application discloses a protective gas supply device for oxygen-free copper rod production, which comprises a fan, a combustion furnace, a primary cooling device, a first gas storage tank, a secondary cooling device, a first gas distribution frame, a pressurizing device, a high-pressure tank and a second gas distribution frame; the fan is connected with the combustion furnace; the combustion furnace is used for carrying out incomplete combustion on natural gas and air to form protective gas; the primary cooling device is connected with the combustion furnace; the first gas storage tank is connected with the primary cooling device; the inlet of the second-stage cooling device is connected with the first gas storage tank, the outlet of the second-stage cooling device is connected with the first gas distribution frame and the pressurizing device respectively, the outlet of the pressurizing device is connected with the high-pressure tank, and the high-pressure tank is connected with the second gas distribution frame. This application makes the protective gas who obtains protection hydrogen and carbon monoxide through the incomplete combustion of natural gas and air, and hydrogen and carbon monoxide can effectively reduce the oxygen content of oxygen-free copper pole as reducing gas with the cooperation of oxygen-free copper pole production facility.
Description
Technical Field
The invention relates to the field of oxygen-free copper rod production, in particular to a protective gas supply device for oxygen-free copper rod production.
Background
The oxygen-free copper rod production equipment mainly comprises a melting furnace, a heat preservation furnace, a pressurizing type crucible assembly, an upper transmission device, a rolling mill and other mechanisms, wherein in the existing production process, in order to protect copper liquid in the melting furnace and prevent the copper liquid from being oxidized, a nitrogen generator is used for producing nitrogen for protecting the copper liquid to isolate oxygen.
In the processing mode, nitrogen is used in the copper liquid, so that oxygen can be isolated, oxygen cannot be reduced, and the nitrogen has no reducibility and cannot reduce the oxygen content in the final copper product; in addition, the surface of the copper rod is easily red and oxidized due to the failure of protecting the surface of the copper rod in the processing of the copper rod.
Disclosure of Invention
The invention aims at the problems and overcomes at least one defect, and provides a protective gas supply device for oxygen-free copper rod production.
The technical scheme adopted by the invention is as follows:
a protective gas supply device for oxygen-free copper rod production comprises a fan, a combustion furnace, a primary cooling device, a first gas storage tank, a secondary cooling device, a first gas distribution frame, a pressurizing device, a high-pressure tank and a second gas distribution frame;
the fan is connected with the combustion furnace and used for sending natural gas and air with set proportion into the combustion furnace;
the combustion furnace is used for carrying out incomplete combustion on natural gas and air to form protective gas, and the protective gas comprises carbon monoxide, hydrogen, carbon dioxide and inert gas;
the primary cooling device is connected with the combustion furnace and is used for cooling protective gas from the combustion furnace;
the first gas storage tank is connected with the primary cooling device and is used for storing the protective gas cooled by the primary cooling device;
the inlet of the second-stage cooling device is connected with the first gas storage tank, the outlet of the second-stage cooling device is connected with the first gas distribution frame and the pressurizing device respectively, the first gas distribution frame is used for supplying gas to at least one of a melting furnace, a holding furnace and an upper transmission device of the oxygen-free copper rod production equipment, the outlet of the pressurizing device is connected with the high-pressure tank and used for storing pressurized protective gas into the high-pressure tank, the high-pressure tank is connected with the second gas distribution frame, and the second gas distribution frame is used for supplying gas to at least one of a pressurizing chamber of the oxygen-free copper rod production equipment and a rolling mill.
The protective gas for protecting hydrogen and carbon monoxide is manufactured through incomplete combustion of natural gas and air, the hydrogen and the carbon monoxide can be used as reducing gas to carry out reduction protection on copper liquid in a melting furnace, a heat preservation furnace and a pressurizing chamber, and can also be used for protecting a copper rod in an upper transmission device and a rolling mill to prevent the surface from being oxidized and reddened. This application and the cooperation of oxygen-free copper pole production facility can effectively reduce the oxygen content of oxygen-free copper pole.
One working principle of the shielding gas supply device is as follows: mix natural gas and air through the fan, send into and fire burning furnace and carry out incomplete combustion, obtain the protective gas who contains reducing gas (hydrogen and carbon monoxide), protective gas has very high temperature, store to first gas holder after will protecting gas cooling through one-level cooling device, protective gas that first gas holder came out divides into two the tunnel after the second grade cooling device, divide into first branch gas frame (low pressure branch gas frame) all the way, be used for melting furnace, holding furnace and last transmission, another way is through pressure device pressurization, finally pass through second branch gas frame (high pressure branch gas frame), be used for pressurized chamber and rolling mill.
In one embodiment of the present invention, the mixing ratio of the natural gas to the air is (1: 93-95% of methane, 3-5% of ethane, 0.5-1.5% of propane, 0.3-0.7% of butane and 0.3-0.7% of nitrogen.
The proportion and the percentage content are volume ratio. The incomplete combustion reaction is an exothermic reaction, so that the combustion furnace does not need external heat energy, and the reaction can be continuously carried out by the heat generated by combustion.
Preferably, the mixing ratio of the natural gas to the air is 1: methane 94%, ethane 4%, propane 1%, butane 0.5% and nitrogen 0.5%.
In one embodiment of the present invention, in the protective gas, the content of carbon monoxide is 5% to 9%, the content of hydrogen is 4% to 6%, the content of carbon dioxide is 6% to 10%, and the content of nitrogen is 75% to 85%. The above percentage amounts refer to volume ratios.
Preferably, in the protective gas, the content of carbon monoxide is 7%, the content of hydrogen is 5%, the content of carbon dioxide is 8%, and the content of nitrogen is 80%.
In one embodiment of the present invention, a second air storage tank is further disposed between the secondary cooling device and the pressurizing device.
In an embodiment of the present invention, a reducing gas detector is disposed on an outlet pipeline of the secondary cooling device, and the reducing gas detector is configured to detect the content of hydrogen and carbon monoxide on line.
In one embodiment of the present invention, the primary cooling device includes a cooling water tank and a heat exchange coil disposed in the cooling water tank, an inlet of the heat exchange coil is communicated with an outlet of the burner, and an outlet of the heat exchange coil is communicated with the first air storage tank;
the secondary cooling device is a cold dryer.
In one embodiment of the invention, the first gas distribution frame is used for supplying gas to the melting furnace, the holding furnace and the upper transmission device, and the second gas distribution frame is used for supplying gas to the pressurizing chamber and the rolling mill.
In one embodiment of the present invention, the blower is a roots blower.
The invention has the beneficial effects that: the protective gas for protecting hydrogen and carbon monoxide is manufactured through incomplete combustion of natural gas and air, the hydrogen and the carbon monoxide can be used as reducing gas to carry out reduction protection on copper liquid in a melting furnace, a heat preservation furnace and a pressurizing chamber, and can also be used for protecting a copper rod in an upper transmission device and a rolling mill to prevent the surface from being oxidized and reddened. This application and the cooperation of oxygen-free copper pole production facility can effectively reduce the oxygen content of oxygen-free copper pole.
Drawings
FIG. 1 is a flow diagram of a protective gas supply apparatus for oxygen-free copper rod production;
fig. 2 is a flow diagram of a shielding gas introduction.
The various reference numbers in the figures are:
1. a fan; 2. a combustion furnace; 3. a primary cooling device; 4. a first gas tank; 5. a secondary cooling device; 6. a first gas-dividing frame; 7. a pressurizing device; 8. a high-pressure tank; 9. a second gas distribution frame; 10. a melting furnace; 11. a holding furnace; 12. an upper transmission device; 13. a pressurized chamber; 14. a rolling mill; 15. a second gas tank; 16. a reducing gas detector; a. air; b. natural gas.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the embodiments described are some, but not all embodiments of the present application. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The present invention will now be described in detail with reference to the drawings.
As shown in fig. 1 and 2, a protective gas supply device for oxygen-free copper rod production comprises a fan 1, a combustion furnace 2, a primary cooling device 3, a first gas storage tank 4, a secondary cooling device 5, a first gas distribution frame 6, a pressurizing device 7, a high-pressure tank 8 and a second gas distribution frame 9;
the fan 1 is connected with the combustion furnace 2 and is used for sending natural gas b and air a with set proportion into the combustion furnace 2;
the combustion furnace 2 is used for carrying out incomplete combustion on natural gas and air to form protective gas, and the protective gas comprises carbon monoxide, hydrogen, carbon dioxide and inert gas;
the primary cooling device 3 is connected with the combustion furnace 2 and is used for cooling the protective gas from the combustion furnace 2;
the first gas storage tank 4 is connected with the primary cooling device 3 and is used for storing the protective gas cooled by the primary cooling device 3;
an inlet of the secondary cooling device 5 is connected with the first gas storage tank 4, an outlet of the secondary cooling device 5 is respectively connected with the first gas distribution frame 6 and the pressurizing device 7, the first gas distribution frame 6 is used for supplying gas to at least one of the melting furnace 10, the holding furnace 11 and the upper transmission device 12 of the oxygen-free copper rod production equipment, an outlet of the pressurizing device 7 is connected with the high-pressure tank 8 and used for storing pressurized protective gas into the high-pressure tank 8, the high-pressure tank 8 is connected with the second gas distribution frame 9, and the second gas distribution frame 9 is used for supplying gas to at least one of the pressurizing chamber 13 and the rolling mill 14 of the oxygen-free copper rod production equipment.
The protective gas for protecting hydrogen and carbon monoxide is prepared by incomplete combustion of natural gas and air, and the hydrogen and the carbon monoxide can be used as the reducing gas to carry out reduction protection on copper liquid in the melting furnace 10, the holding furnace 11 and the pressurizing chamber 13 and also can be used for protecting copper rods in the upper transmission device 12 and the rolling mill 14 so as to prevent the surfaces from oxidizing and reddening. This application and the cooperation of oxygen-free copper pole production facility can effectively reduce the oxygen content of oxygen-free copper pole.
One working principle of the shielding gas supply device is as follows: natural gas and air are mixed through a fan 1 and are sent into a combustion furnace 2 for incomplete combustion, protective gas containing reducing gas (hydrogen and carbon monoxide) is obtained, the protective gas has high temperature, the protective gas is cooled through a primary cooling device 3 and then stored into a first gas storage tank 4, the protective gas coming out of the first gas storage tank 4 is divided into two paths through a secondary cooling device 5, one path is divided into a first gas distribution frame 6 (low-pressure gas distribution frame) and used for a melting furnace 10, a holding furnace 11 and an upper transmission device 12, the other path is pressurized through a pressurizing device 7, and finally the protective gas passes through a second gas distribution frame 9 (high-pressure gas distribution frame) and used for a pressurizing chamber 13 and a rolling mill 14.
In this embodiment, preferably, the mixing ratio of the natural gas to the air is 1: methane 94%, ethane 4%, propane 1%, butane 0.5% and nitrogen 0.5%. The incomplete combustion reaction is an exothermic reaction, so that the combustion furnace 2 can continuously perform the reaction by the heat generated by combustion of itself without providing heat energy from the outside.
In actual use, the mixing ratio of natural gas to air may be (1: 93-95% of methane, 3-5% of ethane, 0.5-1.5% of propane, 0.3-0.7% of butane and 0.3-0.7% of nitrogen.
In this embodiment, it is preferable that the content of carbon monoxide, the content of hydrogen, the content of carbon dioxide and the content of nitrogen in the protective gas are 7%, 5%, 8% and 80%, respectively.
In practical application, the content of carbon monoxide, hydrogen, carbon dioxide and nitrogen in the protective gas can be 5% -9%, 4% -6%, 6% -10% and 75% -85%.
The various proportions and percentages of this example refer to volume ratios.
As shown in fig. 1, in the present embodiment, a second air tank 15 is further provided between the secondary cooling device 5 and the pressurizing device 7.
As shown in fig. 1, in the present embodiment, a reducing gas detector 16 is disposed on an outlet pipeline of the secondary cooling device 5, and the reducing gas detector 16 is used for detecting the content of hydrogen and carbon monoxide on line.
In this embodiment, the primary cooling device 3 includes a cooling water tank and a heat exchange coil disposed in the cooling water tank, an inlet of the heat exchange coil is communicated with an outlet of the burner, and an outlet of the heat exchange coil is communicated with the first gas storage tank 4;
the secondary cooling device 5 is a cold dryer.
As shown in fig. 2, in the present embodiment, the first gas-dividing frame 6 is used to supply gas to the melting furnace 10, holding furnace 11, and upper transmission device 12, and the second gas-dividing frame 9 is used to supply gas to the pressurizing room 13 and rolling mill 14.
In the present embodiment, the blower 1 is a roots blower 1.
As shown in the following table, when the protective gas supply device of the embodiment is used in the dip-coating oxygen-free copper rod production equipment, compared with other protective processes and process equipment, the oxygen content of the final copper rod can be less than or equal to 5ppm, and the obtained oxygen-free copper rod has better quality.
Watch 1
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields and are included in the scope of the present invention.
Claims (10)
1. A protective gas supply device for oxygen-free copper rod production is characterized by comprising a fan, a combustion furnace, a primary cooling device, a first gas storage tank, a secondary cooling device, a first gas distribution frame, a pressurizing device, a high-pressure tank and a second gas distribution frame;
the fan is connected with the combustion furnace and is used for sending natural gas and air with set proportion into the combustion furnace;
the combustion furnace is used for carrying out incomplete combustion on natural gas and air to form protective gas, and the protective gas comprises carbon monoxide, hydrogen, carbon dioxide and inert gas;
the primary cooling device is connected with the combustion furnace and is used for cooling protective gas from the combustion furnace;
the first gas storage tank is connected with the primary cooling device and is used for storing the protective gas cooled by the primary cooling device;
the inlet of the second-stage cooling device is connected with the first gas storage tank, the outlet of the second-stage cooling device is connected with the first gas distribution frame and the pressurizing device respectively, the first gas distribution frame is used for supplying gas to at least one of a melting furnace, a holding furnace and an upper transmission device of the oxygen-free copper rod production equipment, the outlet of the pressurizing device is connected with the high-pressure tank and used for storing pressurized protective gas into the high-pressure tank, the high-pressure tank is connected with the second gas distribution frame, and the second gas distribution frame is used for supplying gas to at least one of a pressurizing chamber of the oxygen-free copper rod production equipment and a rolling mill.
2. The shielding gas supply apparatus for oxygen-free copper rod production according to claim 1, wherein the natural gas is mixed with air in a ratio of (1: 93 to 95 percent of methane, 3 to 5 percent of ethane, 0.5 to 1.5 percent of propane, 0.3 to 0.7 percent of butane and 0.3 to 0.7 percent of nitrogen.
3. The shielding gas supply apparatus for oxygen-free copper rod production as claimed in claim 2, wherein the natural gas is mixed with air at a ratio of 1: methane 94%, ethane 4%, propane 1%, butane 0.5%, and nitrogen 0.5%.
4. The shielding gas supplying apparatus for oxygen-free copper rod production as claimed in claim 1, wherein the shielding gas has a carbon monoxide content of 5% to 9%, a hydrogen content of 4% to 8%, a carbon dioxide content of 6% to 10%, and a nitrogen content of 75% to 85%. .
5. The shielding gas supplying apparatus for oxygen-free copper rod production as set forth in claim 4, wherein the shielding gas has a carbon monoxide content of 7%, a hydrogen content of 5%, a carbon dioxide content of 8%, and a nitrogen content of 80%.
6. The protective gas supply apparatus for oxygen-free copper rod production as claimed in claim 1, wherein a second gas tank is further provided between the secondary cooling means and the pressurizing means.
7. The protective gas supply apparatus for oxygen-free copper rod production as claimed in claim 1, wherein a reducing gas detector is provided on an outlet pipe of the secondary cooling means, the reducing gas detector being adapted to detect the contents of hydrogen and carbon monoxide on line.
8. The protective gas supply device for oxygen-free copper rod production according to claim 1, wherein the primary cooling device comprises a cooling water tank and a heat exchange coil arranged in the cooling water tank, an inlet of the heat exchange coil is communicated with an outlet of the burner, and an outlet of the heat exchange coil is communicated with the first gas storage tank;
the secondary cooling device is a cold dryer.
9. The shielding gas supplying apparatus for oxygen-free copper rod production as claimed in claim 1, wherein the first gas-distributing frame is used for supplying gas to the melting furnace, holding furnace and upper transmission means, and the second gas-distributing frame is used for supplying gas to the pressurizing room and rolling mill.
10. The shielding gas supply apparatus for oxygen-free copper rod production as set forth in claim 1, wherein said blower is a roots blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211345936.9A CN115654490A (en) | 2022-10-31 | 2022-10-31 | Protective gas supply device for oxygen-free copper rod production |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211345936.9A CN115654490A (en) | 2022-10-31 | 2022-10-31 | Protective gas supply device for oxygen-free copper rod production |
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| CN115654490A true CN115654490A (en) | 2023-01-31 |
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| CN202211345936.9A Pending CN115654490A (en) | 2022-10-31 | 2022-10-31 | Protective gas supply device for oxygen-free copper rod production |
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