CN204825004U - Hot type magnesium metal vacuum reduction stove in electromagnetic induction - Google Patents
Hot type magnesium metal vacuum reduction stove in electromagnetic induction Download PDFInfo
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- CN204825004U CN204825004U CN201520550275.2U CN201520550275U CN204825004U CN 204825004 U CN204825004 U CN 204825004U CN 201520550275 U CN201520550275 U CN 201520550275U CN 204825004 U CN204825004 U CN 204825004U
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- Prior art keywords
- furnace
- iron core
- charging basket
- electromagnetic induction
- material basket
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- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 230000005674 electromagnetic induction Effects 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 20
- 239000011777 magnesium Substances 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052802 copper Inorganic materials 0.000 claims abstract description 6
- 239000010949 copper Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 59
- 238000009413 insulation Methods 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 17
- 238000002425 crystallisation Methods 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims 3
- 238000001816 cooling Methods 0.000 claims 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052791 calcium Inorganic materials 0.000 abstract description 6
- 239000011575 calcium Substances 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 229910052712 strontium Inorganic materials 0.000 abstract description 6
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 abstract 2
- 235000017491 Bambusa tulda Nutrition 0.000 abstract 2
- 241001330002 Bambuseae Species 0.000 abstract 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 abstract 2
- 239000011425 bamboo Substances 0.000 abstract 2
- 230000006698 induction Effects 0.000 abstract 1
- 238000006722 reduction reaction Methods 0.000 description 19
- 239000007789 gas Substances 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 206010020843 Hyperthermia Diseases 0.000 description 2
- 235000012550 Pimpinella anisum Nutrition 0.000 description 2
- 240000004760 Pimpinella anisum Species 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000036031 hyperthermia Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005453 pelletization Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000027950 fever generation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 229910000753 refractory alloy Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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
- Y02P10/25—Process efficiency
Landscapes
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The utility model relates to a vacuum metallurgical equipment technical field specifically is a hot type magnesium metal vacuum reduction stove in electromagnetic induction, the induction cooker comprises a cooker bod, be provided with charging basket (8) in the furnace body, the central part of charging basket (8) is equipped with the central passage of passing charging basket (8) bottom surface, be provided with one or a plurality of section of thick bamboo (7) that generates heat in charging basket (8) with one heart, furnace charge (9) are filled with to charging basket (8) and the section of thick bamboo (7) that generates heat, be provided with the rectangle iron core in the furnace body, the central passage that charging basket (8) were passed on a length of branch limit of rectangle iron core, another length of branch limit of rectangle iron core is around there being primary coil (12), the copper winding of primary coil (12) is drawn forth the insulating seal device of end on the furnace body and is drawn forth outside the stove continuously with power supply unit. The utility model relates to a rationally, can adjust the distribution in reducing furnace temperature field, heat transfer efficiency is fast, be used for magnesium, lithium, the production of high vapour pressure metallothermic processes such as strontium, calcium.
Description
Technical field
The utility model relates to vacuum metallurgy equipment technical field, is specially a kind of electromagnetic induction internal heat type vacuum reducing stove, can be used for hot reducing method and prepare magnesium, lithium, the equipment of the high-vapor-pressure metal such as strontium, calcium.
Background technology
The high-vapor-pressure metals such as magnesium, lithium, strontium, calcium, can use hot reducing method to prepare under vacuum.At present in MAGNESIUM METAL production field, widely used reduction apparatus is the reductive jar using the direct heating such as combustion gas to be made up of refractory alloy.This method is by the restriction of reductive jar structure and material property, and temperature of reaction is low, heat transfer is slow, energy consumption is high, and consumes the nichrome of costliness in a large number due to the oxidation equal loss of reductive jar.
Electricity internal heat type vacuum reducing stove can overcome the problems such as the high and reductive jar consumption of the energy consumption of external-heat reduction furnace.The problem that important solution by electricity internal heat type vacuum reducing stove improves the speed that in furnace charge, heat transmits, and enhances productivity.As U.S.Patent4,264,778 disclosed a kind of electric internal heat type vacuum reducing stove in 1980, and flat electric heating piece is made volution, furnace charge and electric heating piece is stacked is placed in furnace chamber that lagging material surrounds.Su Zhongxing etc. disclose a kind of smelting-furnace for magnesium metal in the public announcement of a patent application specification sheets of publication number CN101033511A.The furnace charge that reduces in the program is contained in the pan be made up of heating resisting metal, the stacked placement of multiple pan, uses conductive exothermal block to support between dish.Transmitting electrode makes the heating of conductive exothermal block heat furnace charge by powering to multiple heating resisting metal dish and conductive exothermal block cascaded structure.Wang Xiaogang discloses a kind of internal heat type-multiple heat resources-electric warming metal magnesium reduction furnace in utility model patent ZL200620136021.7.Single or multiple lift tabular heating element to be encapsulated in body of heater reaction warehouse and to be connected with the electrode be arranged on body of heater.Feng Naixiang discloses a kind of inner resistance heating metallothermic reduction furnace for melting magnesium in the public announcement of a patent application specification sheets of publication number CN1952191A, aggregate material is placed in the upper and lower of band resistance heating element and left and right.
Prior art Problems existing is: in order to reduce the electric current flowing through water cooled electrode, heating resistor is all configured to thin and narrow sheet, and intensity is low, and the life-span is short, dress unloading difficulties.If use the heating element of high structural strength, certainly will cause that service voltage is low and electric current is large.Own loss to the water cooled electrode of heating element feed and the loss to furnace heat increase all greatly.For the ease of the bulk handling of furnace charge, heating element and power supply buses adopt connection electrode of living in stove.Flow through the local pyrexia of the contact resistance of electrode contact surface due to the high temperature in stove and electric current, be easy to connection electrode to burn out.
Summary of the invention
For the technical barrier of existing electric heating internal vacuum reducing stove, the utility model provides a kind of electromagnetic induction internal heat type vacuum reducing stove, and for magnesium, lithium, the high-vapor-pressure metal such as strontium, calcium hot reducing method is produced.
The utility model adopts following technical scheme to realize:
A kind of electromagnetic induction internal heat type MAGNESIUM METAL vacuum reducing stove, be internal heat type vacuum oven, comprise body of heater, body of heater is vertical heater, has two furnace chambers, is reduction reaction chamber and crystallisation chamber respectively.
Be provided with charging basket in described body of heater, the central part of described charging basket is provided with the centre channel through charging basket bottom surface; One or more Heating tube is provided with one heart in described charging basket; Furnace charge is filled in described charging basket.
Be provided with rectangle iron core in described body of heater, the centre channel of charging basket is passed on a long limit of described rectangle iron core, and another long limit of described rectangle iron core is wound with primary coil; The insulation seal device of copper winding leading-out end on body of heater of described primary coil leads to outside stove and is connected with supply unit.
Thermal insulation layer is provided with between described body of heater and charging basket; Thermal insulation layer is provided with between described iron core and charging basket.
Described upper of furnace body, by metallic vapor expanding channels crystallisation chamber, is provided with thermal insulation layer in described metallic vapor passage, described metallic vapor passage offers and slightly takes out mouth.
Described crystallisation chamber is outside equipped with water jacket, and described crystallisation chamber top is provided with essence and takes out mouth.
During work, varying in size according to charging basket, is placed with the one or more Heating tubes concentric with charging basket in charging basket.The reduction furnace charge of pelletizing shape is seated in charging basket around Heating tube, directly contacts with charging basket and Heating tube.The high-frequency alternating current be applied on copper winding by supply unit produces the magnetic field of alternation in the core which.Thus metal charging basket and in Heating tube in produce induced current.The heat that the electric current of inducting in charging basket and Heating tube produces is heated furnace charge by conduction and radiation two kinds of modes.By this electromagnetic induction process, electric energy contactlessly passes to charging basket and Heating tube carrys out reacting by heating furnace charge.In reduction process, slightly take out mouth in thick vacuumizing phase use and bleed, thus the floating dust in furnace chamber gas can not be deposited in crystallisation chamber the purity drop making Crystalline Magnesium.When reaching higher vacuum tightness, now gas flow is very low, closes and slightly takes out mouth, takes out mouthful to vacuumize from the essence through crystallisation chamber.
Preferably, a limit of iron core is positioned on the axis of cylindrical furnace chamber, and passes the center of hollow circle tube charging basket, and furnace shell wall is pressed close on other three limits of iron core.
Charging basket surface is cut and is paralleled to the axis and the slit of staggered arrangement, adds the resistance of charging basket, decreases thermal value, and be conducive to reducing the magnesium vapor diffusion obtained.Built-in heating barrel also can have similar slit to control the thermal value of Heating tube, to meet the equally distributed needs in charge-temperature field.
Further, in order to make the loading, unloading material of reduction furnace more convenient.
Design body of heater is made up of upper furnace shell and lower bell, and described upper furnace shell and lower bell pass through Flange joint.
Described rectangle iron core is made up of upper core and lower core.
Described lower bell and be positioned at the lower core of lower bell, thermal insulation layer and charging basket entirety and form lower bell assembly.Described upper furnace shell and the upper core, the upper furnace shell assembly of thermal insulation layer entirety formation that are positioned at furnace shell.
Reinforced or the discharging of reduction furnace is by taking off realization by lower bell component integration, and feed in raw material and be directly added in charging basket, discharging directly topples over charging basket.
Compared with prior art, the utility model advantage specific as follows:
Have thermal insulation layer between the reduction furnace charge of 1, furnace shell and high temperature, casing temperature is only a little more than envrionment temperature.Therefore, body of heater only need use plain carbon stool manufacture.
2, heating element (charging basket and Heating tube) is the tubular article be made up of certain thickness heat-resisting steel sheet and plate, and structural strength is large, not fragile in handling charge process.
3, heating element (charging basket and Heating tube) overall consistent heat generation, and be made up of thicker heat-resisting steel sheet and plate, heat conduction is rapid, and heating element self-temperature is evenly distributed, and there will not be localized hyperthermia and damages.Whole heating element is in vacuum environment inside, stressed very little, and due to the protection of vacuum not oxidizable.Therefore, in stove, Heating temperature higher than Pidgeon process, can improve reduction reaction speed and furnace charge utilization ratio greatly.
4, charging basket is made up of high temperature steel, and the quantity of the Heating tube placed with one heart in charging basket can adjust according to the size of charging basket, makes enough area of dissipations and shorter heat transfer distances, thus ensures that the speed of the heat transmission when amassing compared with aniseed basket can not reduce.Thus this reduction furnace list stove charge amount is large, and the recovery time is short, and production efficiency is high.
5, power supply puts on the primary coil of an Equivalent Transformer by electric supply installation, and service voltage is high, and feeding electrode electric current is little.Feeding electrode does not contact with heating element simultaneously, and thus without the need to using water cooled electrode, furnace binding is simple, and calorific loss is little.
6, heating element is positioned at reduction furnace charge inside, and main heat transmits from inside to outside, and thermal losses is little, and energy utilization rate is high.
7, independent slightly take out mouth owing to employing, the floating dust in furnace chamber gas can not deposit within the condenser, and thus Crystalline Magnesium purity is high.
8, the loading, unloading material mode of reduction furnace is very convenient, quick.
The utility model is reasonable in design, and can regulate the distribution in reduction furnace temperature field, heat transfer efficiency is fast; Be mainly used in magnesium, lithium, the high-vapor-pressure metal such as strontium, calcium hot reducing method is produced.
Accompanying drawing explanation
Fig. 1 represents the overall structure diagrammatic cross-section of reduction furnace described in the utility model.
Fig. 2 represents electromagnetic assembly sectional view.
Fig. 3 represents that charging basket surface local slot arranges schematic diagram.
In figure, the upper furnace shell of 1-, bell under 2-, 3-upper core, 4-lower core, 5-thermal insulation layer, 6-crystallisation chamber, 7-Heating tube, 8-charging basket, 9-furnace charge, 10-metallic vapor passage, 11-iron core, 12-primary coil, 13-slightly takes out mouth, and 14-essence takes out mouth, 15-water cooled pipeline, 16-water jacket, 17-slit.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the utility model is described in detail.
A kind of electromagnetic induction internal heat type MAGNESIUM METAL vacuum reducing stove, comprising body of heater is vertical heater, has two furnace chambers, is reduction reaction chamber and crystallisation chamber respectively.
As shown in Figure 1, described body of heater is made up of upper furnace shell 1 and lower bell 2, and described upper furnace shell 1 and lower bell 2 pass through Flange joint.
As shown in Figure 1, be provided with charging basket 8 in described body of heater, the central part of described charging basket 8 is provided with the centre channel through charging basket 8 bottom surface.Varying in size according to charging basket, is provided with one or more Heating tube 7 with one heart in described charging basket 8.Make enough area of dissipations and shorter heat transfer distances, thus ensure that the speed of the heat transmission when amassing compared with aniseed basket can not reduce.
As shown in Figure 1, thermal insulation layer 5 is provided with between described body of heater and charging basket 8.Have thermal insulation layer between the reduction furnace charge of furnace shell and high temperature, casing temperature is only a little more than envrionment temperature.Described body of heater adopts general carbon steel to make.General carbon steel is the abbreviation of carbon structural steel, belongs to soft steel, and carbon content is less than 0.38%, the most conventional to be less than 0.25%.Described charging basket 8 adopts high temperature steel to make.Heating tube is for be made up of certain thickness heat-resisting steel sheet and plate, and structural strength is large, not fragile in handling charge process.High temperature steel is the steel alloy at high temperature with higher intensity and good chemical stability, comprises Oxidation Resistant Steel (or claiming high temperature non-scaling steel) and Refractory Steel two class.
The reduction furnace charge 9 of pelletizing shape is seated in Heating tube 7 in charging basket 8 and around, directly contacts with charging basket wall and Heating tube.
As shown in Figure 3, slit 17 that is parallel and the also staggered arrangement of axis is cut on charging basket 8 surface, adds the resistance of charging basket, decreases thermal value, and be conducive to reducing the magnesium vapor diffusion obtained.The wall of the outer-rotor of built-in heating cylinder 7 also can have similar slit to control the thermal value of Heating tube to meet the needs of charge-temperature field distribution.
As shown in Figure 1, be provided with rectangle iron core in described body of heater, rectangle iron core is made up of upper core 3 and lower core 4.The centre channel of charging basket 8 is passed on a long limit of described rectangle iron core, and is positioned on the central axis of cylindrical furnace, also arranges thermal insulation layer between centre channel and iron core.Furnace shell wall is pressed close on other three limits of iron core.Thermal insulation layer 5 is provided with between described iron core and charging basket 8.Another long limit of rectangle iron core is wound with primary coil 12.As shown in Figure 2, the inner side of the copper winding of primary coil 12 is provided with the vertically arranged water cooled pipeline 15 with primary coil 12.The insulation seal device of copper winding leading-out end on body of heater of described primary coil 12 leads to outside stove and is connected with supply unit.
The alternating-current be applied on winding by supply unit produces the magnetic field of alternation in the core which.Thus metal charging basket and in Heating tube in produce induced current, the heat that the electric current of inducting in charging basket and Heating tube produces is by conduct and radiation two kinds of modes heat furnace charge.By this electromagnetic induction process, electric energy contactlessly passes to charging basket and Heating tube carrys out reacting by heating furnace charge.Heating element (charging basket and Heating tube) overall consistent heat generation, and be made up of thicker heat-resisting steel sheet and plate, heat conduction is rapid, and heating element self-temperature is evenly distributed, and there will not be localized hyperthermia and damages.It is inner that heating element is positioned at reduction furnace charge, and main heat transmits from inside to outside, and thermal losses is little, and energy utilization rate is high.
As shown in Figure 1, described lower bell 2 and be positioned at the lower core 4 of lower bell 2, thermal insulation layer 5 and charging basket 8 entirety and form lower bell assembly; Described upper furnace shell 1 and the upper core 3, the upper furnace shell assembly of thermal insulation layer 5 entirety formation that are positioned at furnace shell 1.During handling material, wholely take off lower bell assembly, to be reinforcedly directly added in charging basket, discharging directly topples over charging basket, is finally inserted by charging basket in upper furnace shell assembly, fastening external flanges.
As shown in Figure 1, described upper of furnace body connects crystallisation chamber 6 by metallic vapor path 10, is provided with thermal insulation layer 5, described metallic vapor path 10 offers and slightly takes out mouth 13 in described metallic vapor path 10.Described crystallisation chamber 6 is outside equipped with water jacket 16, and described crystallisation chamber 6 top is provided with essence and takes out mouth 14.Slightly take out mouth in thick vacuumizing phase use to bleed, thus the floating dust in furnace chamber gas can not deposit in a crystallizer and make the purity drop of Crystalline Magnesium.When reaching higher vacuum tightness, now gas flow is very low, closes and slightly takes out mouth, take out mouth vacuumize from the essence through crystallizer.Whole heating element is in vacuum environment inside, stressed very little, and due to the protection of vacuum not oxidizable.
Above-mentioned vacuum reducing stove is mainly used in magnesium, lithium, and the high-vapor-pressure metal such as strontium, calcium hot reducing method is produced.
It should be noted last that; above embodiment is only in order to illustrate the technical solution of the utility model and unrestricted; although be described in detail with reference to the utility model embodiment; those of ordinary skill in the art is to be understood that; the technical solution of the utility model is modified or equivalent replacement; do not depart from the spirit and scope of the technical solution of the utility model, it all should be contained in claims of the present utility model.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520550275.2U CN204825004U (en) | 2015-07-28 | 2015-07-28 | Hot type magnesium metal vacuum reduction stove in electromagnetic induction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520550275.2U CN204825004U (en) | 2015-07-28 | 2015-07-28 | Hot type magnesium metal vacuum reduction stove in electromagnetic induction |
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| Publication Number | Publication Date |
|---|---|
| CN204825004U true CN204825004U (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520550275.2U Expired - Fee Related CN204825004U (en) | 2015-07-28 | 2015-07-28 | Hot type magnesium metal vacuum reduction stove in electromagnetic induction |
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| Country | Link |
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| CN (1) | CN204825004U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018730A (en) * | 2015-07-28 | 2015-11-04 | 山西大学 | Electro-magnetic induction internal thermal type metallic magnesium vacuum reduction furnace |
-
2015
- 2015-07-28 CN CN201520550275.2U patent/CN204825004U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018730A (en) * | 2015-07-28 | 2015-11-04 | 山西大学 | Electro-magnetic induction internal thermal type metallic magnesium vacuum reduction furnace |
| CN105018730B (en) * | 2015-07-28 | 2017-03-08 | 山西大学 | Electromagnetic Induction Internal Heating Type Magnesium Vacuum Reduction Furnace |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151202 Termination date: 20170728 |