CN201694850U - Magnesium silicide reaction furnace - Google Patents
Magnesium silicide reaction furnace Download PDFInfo
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- CN201694850U CN201694850U CN2010201955712U CN201020195571U CN201694850U CN 201694850 U CN201694850 U CN 201694850U CN 2010201955712 U CN2010201955712 U CN 2010201955712U CN 201020195571 U CN201020195571 U CN 201020195571U CN 201694850 U CN201694850 U CN 201694850U
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- magnesium silicide
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Abstract
The utility model discloses a magnesium silicide reaction furnace, which comprises a furnace body. A partition board adaptive to the cross section of the furnace body is arranged in the furnace body. The partition board divides the furnace body into a heat exchange chamber at the upper part and a reaction chamber at the lower part. Conducting bars filled with conducting medium pass through the partition board and are respectively arranged in the heat exchange chamber and the reaction chamber. A cooling medium inlet and a cooling medium outlet are arranged on the furnace wall of the heat exchange chamber. A charging port, a temperature measuring port, a vacuum port and a discharging port are arranged on the furnace wall of the reaction chamber. The magnesium silicide reaction furnace can well solve the problem that the magnesium silicide synthetic reaction heat of the traditional magnesium silicide reaction furnace is difficultly exported so as to effectively amplify the reactive silicon magnesium prepared by magnesium silicide and control the reaction under 700 degrees. The reactive product magnesium silicide is loosened and does not pack and the reaction yield is improved above 90 per cent.
Description
Technical field
The utility model relates to a kind of preparation facilities of magnesium silicide, is a kind of magnesium silicide Reaktionsofen specifically.
Background technology
Magnesium silicide (Mg2Si) is a kind of thermoelectric material, is again simultaneously the main raw material of magnesium silicide method (being the Xiao Song method) preparation silane gas, and the main raw material of producing silicon nitride magnesium (MgSiN2) non-oxide ceramics powder.The reaction of synthesizing magnesium silicide is a thermopositive reaction, and traditional preparation method is mixed in proportion silica flour and magnesium powder, is being heated to reaction generation magnesium silicide about 550 ℃-700 ℃ in the vacuum oven in the fixed bed mode.But reaction a large amount of heat energy of emitting can not controllably pass rapidly, and this just causes the material instantaneous temperature to be raised to more than 800 ℃ even 1000 ℃, brings serious side reaction, the product caking, thus make the yield of magnesium silicide reduce greatly, only about 40%.
Summary of the invention
Goal of the invention: the purpose of this utility model is to overcome the shortcoming of prior art, proposes a kind of novel magnesium silicide Reaktionsofen and new heat-conducting mode, thereby overcomes the problem that reaction heat that existing magnesium silicide preparation facilities exists can't effectively be derived.
Technical scheme: in order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
A kind of magnesium silicide Reaktionsofen, it comprises body of heater, is provided with the dividing plate adaptive with the body of heater cross section in body of heater, dividing plate is divided into superposed heat exchange chamber with body of heater, and the reaction chamber that is positioned at the body of heater bottom; The heat conductive rod that is filled with heat-conducting medium and closed at both ends passes dividing plate, and places in heat exchange chamber and the reaction chamber; On the furnace wall of heat exchange chamber, be provided with the outlet of cooling medium inlet and heat-eliminating medium; On the reaction chamber furnace wall, be provided with charging opening, temperature-measuring port, vacuum port and discharge port.
Wherein, described heat-conducting medium is filled in the part that heat conductive rod is positioned at reaction chamber, and it can be taken away the heat in the reaction chamber, thereby reduces the product caking.
Wherein, described heat-conducting medium is being solid below 500 ℃, at the basic metal or the inorganic salt of vaporization more than 500 ℃; Described basic metal is potassium, rubidium or caesium; Described inorganic salt are beryllium bromide.
Wherein, described cooling medium inlet is located at the bottom of heat exchange chamber, and the heat-eliminating medium outlet is located at the top of heat exchange chamber, is beneficial to the circulation of heat-eliminating medium, conveniently takes away heat.
Wherein, described charging opening is positioned at the top of reaction chamber, and discharge port is positioned at the bottom of reaction chamber; Make things convenient for the output of reinforced and finished product.
Beneficial effect: the utility model has solved the problem that the magnesium silicide synthesising reacting heat of traditional magnesium silicide Reaktionsofen is difficult to derive well, the reaction silicon magnesium of magnesium silicide preparation is amplified effectively, and make to be reflected at below 700 ℃ and controllably carry out, do not lump and the resultant of reaction magnesium silicide is loose, reaction yield is brought up to more than 90%.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment:
Below in conjunction with synoptic diagram the utility model is described further.
As shown in Figure 1, be provided with the dividing plate 2 adaptive with body of heater 1 cross section in the body of heater 1 of magnesium silicide Reaktionsofen of the present utility model, dividing plate 2 is divided into superposed heat exchange chamber 3 with body of heater 1, and the magnesium silicide synthetic reaction chamber 4 that is positioned at body of heater 1 bottom; Bolting is connected between heat exchange chamber 3 and the reaction chamber 4.The heat conductive rod 5 that is filled with heat-conducting medium passes dividing plate 2, and is fixed on the dividing plate 2.Heat conductive rod 5 places in heat exchange chamber 3 and the reaction chamber 4; The top that is heat conductive rod 5 is in heat exchange chamber 3, and the bottom of heat conductive rod 5 is in reaction chamber 4, and heat-conducting medium fills the Lower Half at heat conductive rod 5.The heat that discharges in the quantity of described heat conductive rod 5 and the loading level of heat-conducting medium and the reaction chamber 4 is adaptive.
The closed at both ends of heat conductive rod 5, the heat-conducting medium in the heat conductive rod 5 is being a solid below 500 ℃, very exothermic in reaction process, temperature raises gradually, and heat-conducting medium melts in the heat conductive rod 5; When temperature in the stove surpassed 600 ℃-700 ℃, the heat-conducting mediums in the heat conductive rod 5 flashed to gas rapidly, and rose in the heat exchange chamber 3 of the first half of body of heater 1.Therefore, the selection of heat-conducting medium is very important, and through a large amount of repeatedly tests, approaching inorganic salt such as the beryllium bromide of potassium, rubidium, caesium and character that filters out in the basic metal is heat-conducting medium.It is big that basic metal has a vaporization heat, vaporization temperature and the tangible characteristics of melt temperature difference.Can take away a large amount of reaction heat when making vaporization, heat exchange chamber 3 in outside heat-eliminating medium heat-shift of coming in after condensation, and flow back to the Lower Half of heat conductive rod 5 along tube wall, get back in the interior heat conductive rod 5 of reaction chamber 4; And the reaction heat of the very fast peak phase of absorption reaction once more, evaporation rises in the heat exchange chamber 3, and whole process can be effectively and is finished rapidly and react the sharply derivation of the reaction heat of generation of peak phase.
Described cooling medium inlet 6 is located at the bottom of heat exchange chamber 3, and heat-eliminating medium outlet 7 is located at the top of heat exchange chamber 3.Described heat-eliminating medium can be air or cold water, and for example Wai Jie fluidizing air enters in the heat exchange chamber 3 from cooling medium inlet 6, the heat on heat conductive rod 5 tops is taken away, and flowed out from heat-eliminating medium outlet 7.
Described charging opening 8 is positioned at the top of reaction chamber 4, and discharge port 11 is positioned at the bottom of reaction chamber 4.
Heat-conducting medium in the described heat conductive rod 5 is to be solid below 500 ℃, and distillation was the basic metal of gas or inorganic salt when temperature surpassed 500 ℃, because the reaction of synthesizing magnesium silicide is a thermopositive reaction, reaction formula is as follows:
2Mg+Si→Mg2Si+77.4KJ
In reaction process, the temperature in the reaction chamber 4 raise rapidly, and the heat-conducting medium in the heat conductive rod 5 is sublimed into gas rapidly and rises to the heat conductive rod 5 of the heat exchange chamber 3 that is positioned at the first half; In heat exchange chamber 3, heat conductive rod 5 carries out thermal exchange with outside heat-eliminating medium of coming in, and heat-conducting medium is cured as the Lower Half of getting back to heat conductive rod 5 along the tube wall of heat conductive rod 5 behind the solid; Heat-conducting medium absorbs the heat of heat conductive rod 5 outsides once more then.So move in circles, the heat with in the magnesium silicide building-up reactions chamber 4 that does not stop exports to body of heater 1 outside.
Embodiment 1:
Added the good potassium powder of calculating in the heat conductive rod 5, sealing both ends is inserted the stove internal fixing on dividing plate 2, silica flour and magnesium powder add in the Reaktionsofen sealed reaction stove by after 1: 1.5 the mixed from charging opening 8, begin heating after vacuumizing, temperature of reaction is controlled at 650 ℃-750 ℃.Reaction finishes blow-on, and reaction product is loose, and main component is a magnesium silicide by analysis, reaction yield 90%.
Embodiment 2:
Added the good beryllium bromide powder of calculating in the heat conductive rod 5, sealing both ends is inserted the stove internal fixing on dividing plate 2, silica flour and magnesium powder add in the Reaktionsofen sealed reaction stove by after 1: 1.5 the mixed from charging opening 8, begin heating after vacuumizing, temperature of reaction is controlled at 550 ℃-650 ℃.Reaction finishes blow-on, and reaction product is loose, and main component is a magnesium silicide by analysis, reaction yield 90.5%.
The utility model provides the effective heat conduction of a kind of magnesium silicide Reaktionsofen thinking and method easy and simple to handle again; the method and the approach of this technical scheme of specific implementation are a lot; the above only is a preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.The all available prior art of each component part not clear and definite in the present embodiment is realized.
Claims (7)
1. magnesium silicide Reaktionsofen, it is characterized in that: it comprises body of heater (1), be provided with in body of heater (1) and the adaptive dividing plate (2) in body of heater (1) cross section, dividing plate (2) is divided into superposed heat exchange chamber (3) with body of heater (1), and the reaction chamber (4) that is positioned at body of heater (1) bottom; The heat conductive rod (5) that is filled with heat-conducting medium and closed at both ends passes dividing plate (2), and places in heat exchange chamber (3) and the reaction chamber (4); On the furnace wall of heat exchange chamber (3), be provided with cooling medium inlet (6) and heat-eliminating medium outlet (7); On the furnace wall of reaction chamber (4), be provided with charging opening (8), temperature-measuring port (9), vacuum port (10) and discharge port (11).
2. a kind of magnesium silicide Reaktionsofen according to claim 1 is characterized in that: described heat-conducting medium is filled in the part that heat conductive rod (5) is positioned at reaction chamber (4).
3. a kind of magnesium silicide Reaktionsofen according to claim 1 and 2 is characterized in that: described heat-conducting medium is being solid below 500 ℃, at the basic metal or the inorganic salt of vaporization more than 500 ℃.
4. a kind of magnesium silicide Reaktionsofen according to claim 3 is characterized in that: described basic metal is potassium, rubidium or caesium.
5. a kind of magnesium silicide Reaktionsofen according to claim 3 is characterized in that: described inorganic salt are beryllium bromide.
6. a kind of magnesium silicide Reaktionsofen according to claim 1 is characterized in that: described cooling medium inlet (6) is located at the bottom of heat exchange chamber (3), and heat-eliminating medium outlet (7) is located at the top of heat exchange chamber (3).
7. a kind of magnesium silicide Reaktionsofen according to claim 1 is characterized in that: described charging opening (8) is positioned at the top of reaction chamber (4), and discharge port (11) is positioned at the bottom of reaction chamber (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201955712U CN201694850U (en) | 2010-05-19 | 2010-05-19 | Magnesium silicide reaction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201955712U CN201694850U (en) | 2010-05-19 | 2010-05-19 | Magnesium silicide reaction furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201694850U true CN201694850U (en) | 2011-01-05 |
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ID=43396092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201955712U Expired - Fee Related CN201694850U (en) | 2010-05-19 | 2010-05-19 | Magnesium silicide reaction furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201694850U (en) |
-
2010
- 2010-05-19 CN CN2010201955712U patent/CN201694850U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110105 Termination date: 20110519 |