CN113801998A - Method and device for continuous reduction of metal magnesium under protection of argon at normal pressure - Google Patents
Method and device for continuous reduction of metal magnesium under protection of argon at normal pressure Download PDFInfo
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- CN113801998A CN113801998A CN202111033194.1A CN202111033194A CN113801998A CN 113801998 A CN113801998 A CN 113801998A CN 202111033194 A CN202111033194 A CN 202111033194A CN 113801998 A CN113801998 A CN 113801998A
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- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
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- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/20—Obtaining alkaline earth metals or magnesium
- C22B26/22—Obtaining magnesium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/16—Dry methods smelting of sulfides or formation of mattes with volatilisation or condensation of the metal being produced
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Abstract
The invention discloses a method and a device for continuously reducing metal magnesium under the protection of argon at normal pressure, which comprises the steps of filling a magnesium raw material into a closed material bin; introducing argon into a closed reaction furnace, preheating a reaction cavity of the reaction furnace, and forming an argon circulation loop by the reaction furnace and a crystallizer; putting a magnesium raw material into a reaction furnace, entering a reaction cavity through a spiral disc, synchronously heating the reaction furnace and the spiral disc of the reaction cavity, controlling the flow and temperature of argon in the reaction cavity, reacting the magnesium raw material with the argon to produce magnesium steam, and entering the magnesium steam into a crystallizer to crystallize to form crystallized magnesium; the pulverized magnesium slag is separated by a separation grate and falls into a slag car; argon is heated by the crystallizer and preheated by the reaction furnace and then enters the reaction cavity again to carry magnesium vapor. The invention solves the problems of pipe sticking, glazing, pellet crushing, deformation of vertical pipe caused by heating stress and the like, improves the magnesium metallurgical efficiency, reduces the energy consumption, eliminates pollution, improves the environment and reduces the cost.
Description
Technical Field
The invention relates to a magnesium metallurgy smelting method, in particular to a method and a device for continuously reducing metal magnesium under the protection of argon at normal pressure.
Background
The Pidgeon magnesium smelting is the mainstream magnesium metallurgy process in China, and has the advantages of small investment, low cost and simple operation. The specific magnesium smelting step is to horizontally insert a plurality of groups of small vacuum reduction tanks into a high-temperature furnace. The bottom of the vacuum reduction tank is filled with reaction raw materials: calcining dolomite, ferrosilicon and fluorite briquettes, and externally providing a cooling crystallization area. The raw material pressing block is heated to the reaction temperature under the external heating effect, and the reduction product magnesium diffuses to a cooling area outside the reduction tank in a steam form to form crystallized magnesium. Because the heat-conducting property of the reduced matter briquette is poor, the size of the reduction pot is small, and the yield is low. After each reaction, the cooling section is taken down to remove the crystallized magnesium. Then the reaction waste residue in the tube is cleaned out. After the reduction tank is cleaned, certain reactants are pressed into the reduction tank again, a cooling section is added, and finally the reduction tank is vacuumized. The next reaction cycle is started. The process is repeated in cycles, and the production of magnesium metallurgy is continued. Because the reduction time is long; manual discharging, feeding, magnesium discharging and slag discharging cannot be carried out continuously, and the efficiency is low; the energy consumption is high, about 4.5 tce/tMg; the reduction pot has short service life; serious pollution and poor environment; the single-tank yield is low and the production cost is high. Therefore, compared with other metal smelting, the pidgeon method for smelting magnesium still has the advantages of high labor intensity, large energy loss and serious environmental pollution; low efficiency, high energy consumption and high pollution technology, and belongs to the field of national restriction development.
With the continuous development of the Pidgeon magnesium smelting process, various economic indexes of the process tend to be stable, and higher breakthrough is difficult to obtain. In order to further reduce the cost and energy consumption of magnesium metallurgy. And (4) sequentially discharging the shaft furnace process. Compared with a horizontal tube magnesium reduction technology, the vertical tube reduction realizes the advantages of 'feeding on, discharging off, continuous rising of steam' and continuous and automatic development. But still is pijiang due to the basic principle of standpipe. More seriously, the shaft furnace process has serious technical obstacles. Firstly, the phenomena of pipe sticking and glaze bonding of the material slag are serious, and automatic slag discharge cannot be realized; secondly, the pellets are easy to break during charging, so that the pellets are blocked, and the reduction rate is influenced; thirdly, the vertical pipe is poor in stress environment, the lower part of the vertical pipe is easy to bulge and expand, and the upper part of the vertical pipe is shrunk, so that the service life of the reduction pot is short; fourthly, the standpipe cost is high, and the change degree of difficulty is big. Therefore, standpipe magnesium reduction is still rarely used. Nevertheless, the potential application advantage of the shaft furnace is still very obvious, solves the problems existing in the prior shaft furnace, and has great significance for expanding the development of the shaft furnace reduction process.
The main problems of magnesium metallurgy continuous reduction are two-point. Firstly, the traditional Pidgeon magnesium smelting needs high vacuum degree, so that certain obstacle exists in the continuity; secondly, the shaft furnace has the problems, which are difficult to solve for a while. However, the continuous process is the key technology for preparing magnesium metallurgy with low cost and low energy consumption. Breaking through the problems, the method has great significance for the development of the magnesium industry and the large-scale application of the magnesium alloy material. In 2017, professor Liu Bo Yu of Western-Anhui traffic university provides a method for reducing metal by silicon heat under normal pressure, so that the metallurgy of magnesium metal can be carried out under normal pressure.
However, the method of using argon as the hot carrier gas for improving heat and mass transfer has a significant problem. This is because the specific heat capacity of argon is small, so it takes long enough time for argon to heat to high temperature (the initial reaction temperature of magnesium-smelting raw material), and at the same time, it needs to continuously introduce high-temperature argon to heat raw material pellets, which results in that a large amount of argon needs to be cooled in the cooling stage, and the demand for cooling medium will also increase. Therefore, the patent has many problems in industrial application.
In the aspect of a shaft furnace structure, the YU professor of the university of Windsor, Canada develops a shaft furnace with the structure of charging at the upper part and discharging at the upper part, and is applied in a certain range. A vertical magnesium smelting reduction furnace and a double-heat storage type reduction furnace matched with the same are developed by Von Jun Hakka, Beijing technology university, and the like, and have the characteristics of high efficiency, energy conservation, uniform heating and the like. The sunward of the university of south and central developed a standpipe device, the unusual feature being that the magnesium product it collects is magnesium metal. Chenyuzhu et al designed a vertical furnace magnesium smelting device and auxiliary facilities, the vertical furnace with spiral feeder, placed the card material. A shaft furnace magnesium smelting device developed by Longsiyuan and the like of Chongqing university is characterized in that a movable central pipe is arranged in a reduction pipe, small holes for magnesium vapor to overflow are formed in the side wall and the upper end of the central pipe, and a spiral blade is arranged to reduce pellet breakage and increase heat transfer and mass transfer. The shaft furnace developed by Ningxia Sun magnesium industry company is provided with a crystallizer which can be conveniently extracted. Zhengzhou university poplar & Pixu et al developed a vertical tube with a central tube with a hole passage. The technologies have certain promotion effect on the vertical pipe reduction furnace in different aspects. But does not completely solve the main problems of shaft furnaces. Such as the problems of pipe sticking and glazing, the problem that the pellets are easy to break, the problem that the vertical pipe deforms under the action of heat and difficulty in replacement.
The prior shaft furnace magnesium smelting technology has the following main problems:
1. a vacuum environment is basically required;
2. the material adhesion and the glaze bonding are serious, and the discharging is difficult;
3. the handling environment of the furnace lining is severe, and the furnace lining is easy to change and difficult to replace;
4. the process control difficulty is large, and industrialization is difficult.
Based on the technical problems, the continuous reduction method and the continuous reduction device for protecting the metal magnesium by adopting the normal-pressure argon become the technical problems to be solved urgently at present.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method and a device for continuously reducing magnesium metal under the protection of argon at normal pressure.
The invention is realized by the following technical scheme.
In one aspect of the invention, a method for continuously smelting magnesium by using a normal pressure shaft furnace is provided, which comprises the following steps:
magnesium raw material pellets are filled in a closed bunker;
introducing argon into a closed reaction furnace, preheating a reaction cavity of the reaction furnace, and enabling the reaction furnace and a crystallizer to form an argon circulation loop;
putting a magnesium raw material self-closed bin into a reaction furnace, feeding the magnesium raw material into a reaction chamber through a spiral disc, synchronously heating the reaction furnace and the spiral disc of the reaction chamber, controlling the flow and temperature of argon in the reaction chamber, producing magnesium steam through reduction reaction of magnesium raw material pellets, and feeding the magnesium steam into a crystallizer to crystallize to form crystallized magnesium;
unreacted magnesium raw materials at the bottom of the reaction furnace form magnesium slag, the magnesium slag is pulverized after phase change in the cooling process, and slag materials are separated by a partition grate and fall into a slag car;
preferably, argon is introduced into the reaction furnace to 0.1Mpa, and the heating temperature of the reaction cavity of the reaction furnace is 1100-1300 ℃.
Preferably, the magnesium raw material is raw material pellets, and the raw material pellets roll from a closed bunker and enter a spiral disc.
Preferably, the rolling speed and the slag discharge speed of the magnesium raw material ball in the spiral plate are 10 kg/min.
Preferably, the unreacted argon passes through a crystallizer and is heated to 800-1000 ℃.
On the other hand, the invention provides a normal-pressure argon-protected metal magnesium continuous reduction device adopted by the method, which comprises a reaction furnace and a crystallizer, wherein a closed material bin is arranged at the top of the reaction furnace, a reaction cavity is arranged in a furnace body, and the reaction furnace is communicated with the crystallizer; a porous pipe and a spiral disc are arranged in the reaction cavity, the porous pipe is communicated with the circulation loop, and the spiral disc is communicated with the closed material bin; the bottom of the reaction furnace is provided with a slag discharging port.
Preferably, the bottom of the reaction cavity is provided with a slag discharging area, and the slag discharging area discharges slag through a slag discharging hole.
Preferably, the slag discharging area comprises a ball slag bin, a powder slag bin, a rotary baffle and a slag car from top to bottom, the ball slag bin and the powder slag bin are separated through a partition grate, the powder slag bin is provided with the rotary baffle, the rotary baffle is a slag discharging hole, and the slag car is in butt joint with the slag discharging hole.
Preferably, the circulating loop is also communicated with a quick cooling fan and a heating cylinder.
Preferably, the spiral discs are distributed along the outer wall of the porous pipe in a spiral line, and the heaters are arranged above and below the spiral discs.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1) the furnace body heating and the heating wire at the bottom of the spiral disk are adopted for synchronous heating, namely, an internal and external double-heat synchronous heating mode is adopted, so that the heat transfer efficiency of the raw material pellets can be obviously improved, the raw material pellets are effectively heated and fully reacted in a limited heat transfer path in which the spiral disk rolls from top to bottom, and the reduction efficiency is effectively prevented from being influenced due to poor heat conductivity of the pellets.
2) The feeding, reaction and discharging of the spiral disk are adopted, the pellets automatically roll down on the spiral disk at a certain inclination angle by means of gravity, and the automatic discharging is realized while the sufficient reaction time is ensured.
3) Considering that the reacted slag balls have a pulverization process of volume expansion in a cooling process, the reserved blanking space, including the volume of the ball slag area and the volume of the powder slag area, are designed to be more than 1.1 times of the feeding volume (the maximum volume of the material balls which can be placed on the spiral disc), so that the waste materials after reaction are discharged without blockage, and the materials on the spiral disc are ensured to uniformly and continuously move.
4) And under the action of a fan, the protective argon in the furnace carries magnesium steam to enter a cooling area together. The magnesium vapour crystallizes in the cooling zone to form crystalline magnesium. Argon is reheated by the heating cylinder under the action of the fan and is heated by high-temperature magnesium slag at the bottom of the shaft furnace, and then enters the reduction region again to carry magnesium steam, so that the heat of the high-temperature magnesium slag is recycled, and the energy is saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a general block diagram of an atmospheric magnesium metallurgical shaft furnace;
1. the device comprises a closed material bin, 2, a feeding pipe, 3, a reaction cavity, 4, a slag discharging area, 5, a slag car, 6, a circulating pipeline, 7, a heating cylinder, 8, a quick cooling fan, 9, a crystallizer, 10, a reaction furnace, 11 and an air valve.
FIG. 2 is an enlarged structural view of a reaction zone of a normal pressure magnesium metallurgy shaft furnace.
301. An electronic valve 302, a first rotating baffle plate 303, a reaction zone outer wall 304, a spiral disc 305, a perforated pipe 306, a ball slag bin 307, a partition grate 308, a powder slag bin 309, a second rotating baffle plate 310 and a heater.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
As shown in fig. 1 and 2, in one aspect of the present invention, the atmospheric argon-protected magnesium metal continuous reduction apparatus provided in the embodiment includes a reaction furnace 10 and a crystallizer, a closed bunker 1 is disposed at the top of the reaction furnace 10, a reaction chamber 3 is disposed in a furnace body, and the reaction furnace 10 is communicated with the crystallizer to form a circulation loop; a porous pipe 305 and a spiral disk 304 are arranged in the reaction chamber 3, the spiral disk 304 is tightly attached to the outer wall 305 of the reaction area, the porous pipe 305 is communicated with the circulation loop, the spiral disk 304 is communicated with the closed material bin 1, an electronic valve 301 is arranged at the bottom of the closed material bin 1, and a slag discharge system is arranged at the bottom of the reaction furnace 10. The bottom of the reaction chamber 3 is provided with a slag discharging area 4, the slag discharging area comprises a ball slag bin 306, a powder slag bin 308, a second rotary baffle 309 and a slag car 5 from top to bottom, the ball slag bin and the powder slag bin are separated by a partition grate 307, the powder slag bin 308 is provided with the second rotary baffle 309, the second rotary baffle is a slag discharging port, and the slag car 5 is butted at the slag discharging port. The spiral disks 304 are distributed along the outer wall of the perforated pipe 305 in a spiral line, and the heaters 310 are arranged above and below the spiral disks.
The circulation loop is further communicated with a quick cooling fan 8 and a heating cylinder 7.
In another aspect of the present invention, a method for performing atmospheric argon protection magnesium metal continuous reduction by using the above structure is provided, which comprises the following steps:
step 1, charging: the closed material bin 1 is filled with magnesium raw material balls required by continuous production, and raw materials can be added at any time during the production process. The pellets are ellipsoidal, the main components of the pellets are calcined dolomite, ferrosilicon and fluorite, and the thermal conductivity coefficient is low.
Setting the temperature of a heating wire at the bottom of a reaction furnace and a spiral disk 304 at 1100-1300 ℃, setting the temperature of a heating cylinder 7 at 800-1000 ℃, simultaneously opening a quick cooling fan to enable argon to circularly flow in the direction shown by an arrow in figure 1, and enabling the argon to sequentially pass through a reaction cavity 3, a crystallizer 9, a quick cooling fan 8, the heating cylinder 7, a slag discharging area 4 and the reaction area 3 to form an argon circulating loop.
The multifunctional properties of feeding, reaction and discharging are realized by adopting a spiral disc. The pellets are ellipsoidal and have a certain spherical shape. Under the influence of a certain spiral disc gradient, the pellets can realize rolling movement, and the material balls roll in and out, so that the up-and-down extrusion is eliminated, and the integrity of the pellets is reserved; secondly, the pellets in the spiral plate are placed in a single layer, and the pellets are acted by the side wall of the shaft furnace and the upper and lower heaters, so that the heating and heat preservation effects are good, and the reaction efficiency is high; in the discharging stage, the pellets are discharged continuously in a single layer, and the pellets are not subjected to phase change and volume collision under the condition of keeping one temperature; the phenomena of tube sticking, glaze bonding and can expansion are avoided.
Synchronously heating the reaction furnace and the reaction cavity spiral disc, wherein the temperature of the reaction furnace is 1100-1300 ℃, the heating temperature of the spiral disc is 800-1000 ℃, and the flow of argon in the reaction cavity is controlled to be 0.5-50L/min and the temperature is 1100-1300 ℃. Under the high temperature and argon gas environment, magnesium raw material balls are subjected to reduction reaction in the rolling process along the spiral disc 304 to produce magnesium steam, the magnesium steam overflows, the magnesium steam obtained by the reaction is collected in a vertical perforated pipe at the center of the columnar spiral disc and enters a crystallization area from bottom to top under the action of a fan; the reacted magnesium slag moves downwards continuously along the rotating disc. Magnesium vapor is collected in a vertical perforated pipe at the center of the columnar spiral plate and is carried into the crystallizer 9 by argon flowing through the perforated pipe 305; unreacted argon passes through the crystallizer 9 and the quick cooling fan 8, then is heated through the heating cylinder 7, passes through the slag discharging zone 4, is reheated by slag waste heat, enters the reaction cavity 3 to carry magnesium steam, and argon gas circulation and energy recovery are realized.
And under the action of a fan, the protective argon in the furnace carries magnesium steam to enter a cooling area together. The magnesium vapour crystallizes in the cooling zone to form crystalline magnesium. And preheating argon from magnesium slag at the bottom of the shaft furnace under the action of a fan, and then, enabling the argon to enter a reduction zone again to carry magnesium steam, thereby realizing argon circulation and energy recovery.
Wherein, the internal and external double heat mode is adopted, so that the heat transfer of the pellets can be improved. If only gas convection heat transfer is adopted, the gas quantity is large, and the heating and cooling energy consumption is high. The heating effect is good by adopting the internal and external heat synchronous heating mode, the heat transfer path is shortened, and the heat transfer efficiency is improved.
In the invention, heaters are arranged above and below the spiral disk which is erected at the center of the furnace body, and the heaters are matched with the side wall of the shaft furnace for heating, so that the temperature of the furnace body is uniformly distributed, and the phenomenon of bulging and swelling of the furnace body caused by nonuniform temperature distribution for a long time is avoided; the central porous pipe is surrounded by the spiral disc, the porous pipe provides an important channel for discharging magnesium steam, and the circularly flowing argon takes away the magnesium steam after passing through the porous pipe, so that the partial pressure of the magnesium steam on the surface of the material ball is reduced, and the reaction efficiency is improved.
The normal-pressure argon environment is adopted, so that the complexity influence of a vacuum system on the reduction furnace is facilitated to be simplified; and argon circularly flows, and an external quick cooling fan and a gas pipeline provide space and power for argon flowing, so that the argon does not need to be continuously introduced from the outside on the basis of bearing the action of heat transfer and mass transfer (loading magnesium steam to a crystallizer), the using amount of the argon is saved, and the consumption is obviously reduced.
And 4, deslagging and continuously reacting: magnesium raw material ball rolls from top to bottom behind spiral disk 304, and spherical slag charge can fall into ball sediment storehouse 306, and the magnesium sediment takes place the phase transition and the volume expansion at the cooling in-process, and the pelletizing pulverization is broken, pulverizes gradually, sets up the lump material in the unloading pipe and separates the comb, and the upper strata is for not having the pelletizing of pulverization, separates to be the powder storehouse below the comb, and powder storehouse ejection of compact volume is 1.1 times of feeding volume, guarantees like this that the material is even continuously removed on the spiral disk. Falls into the powder slag bin 308 through the partition grate 307, and the slag in the powder slag bin 308 falls into the slag car 5 through the second rotary baffle 309. The feed system (i.e. the closed silo 1 and the electrovalve 301) maintains a suitable continuous feed rate depending on the rolling rate of the pellets in the spiral disk 304 and the reject rate in the reject zone 4.
The shaft furnace structure is beneficial to the characteristics of feeding from top to bottom and slag discharging from the shaft furnace, and the development of the continuous magnesium smelting process is promoted. The key point of the invention is to solve the problems of the shaft furnace, improve the heat and mass transfer efficiency in the reduction process, improve the magnesium reduction efficiency and reduce the energy consumption.
In the discharging stage, continuous single-layer discharging is kept, and the pellets cannot generate phase change and volume collision under the condition of keeping one temperature; the phenomena of pipe sticking, glaze bonding and can expansion can be avoided.
The slag charge system has the waste heat utilization function concurrently, and the upper portion is the ball sediment that just rolls out from the spiral plate, and the lower part is the powder sediment after the ball sediment cooling, and upper and lower two districts are separated with separating the comb, and the argon gas that the circulation flows is when flowing through this district, and the heat in lower part powder sediment district passes through the pipeline heat transfer, for the argon gas heating, and the ball sediment of upper portion then directly is by the direct convection current of argon gas, gives the argon gas with the heat transfer, and later the magnesium steam is taken away in the flow path porous pipe to the argon gas.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (10)
1. A continuous reduction method of metal magnesium under the protection of argon at normal pressure is characterized by comprising the following steps:
magnesium raw material pellets are filled in a closed bunker;
introducing argon into a closed reaction furnace, preheating a reaction cavity of the reaction furnace, and communicating the reaction furnace with a crystallizer to form an argon circulation loop;
putting the magnesium raw material pellets into a reaction furnace from a closed bin, feeding the magnesium raw material pellets into a reaction chamber through a spiral disc, synchronously heating the reaction furnace and the spiral disc of the reaction chamber, controlling the flow and temperature of argon in the reaction chamber, carrying out reduction reaction on the magnesium raw material pellets to generate magnesium steam, and feeding the magnesium steam into a crystallizer to crystallize to form crystallized magnesium;
magnesium slag is formed by unreacted magnesium raw material pellets at the bottom of the reaction furnace, the magnesium slag is pulverized after being cooled, and slag materials are separated by a partition grate and fall into a slag car;
after passing through the crystallizer, unreacted argon passes through the magnesium slag zone of the reaction furnace for preheating and reheating, and enters the reaction cavity again to carry magnesium steam, so that argon circulation and energy recovery are realized.
2. The method for the continuous reduction of metal magnesium under the protection of argon at normal pressure according to claim 1, wherein the argon is introduced into the reaction furnace to 0.1MPa, and the heating temperature of the reaction cavity of the reaction furnace is 1100-1300 ℃.
3. The method of claim 1, wherein the magnesium raw material is raw pellets, and the raw pellets roll from a closed bin into a spiral disk.
4. The method of claim 3, wherein the rolling speed and the slag discharge speed of the magnesium raw material ball in the spiral plate are 5-10 kg/min.
5. The method for continuously reducing metal magnesium under the protection of argon at normal pressure according to claim 1, wherein unreacted argon passes through a magnesium crystallizer and then enters a reduction tank after being heated by a heating cylinder at the temperature of 800-1000 ℃.
6. A continuous reduction device of metal magnesium under the protection of argon at normal pressure according to the method of any one of claims 1 to 5 is characterized by comprising a reaction furnace and a crystallizer, wherein the top of the reaction furnace is provided with a closed storage bin, a reaction cavity is arranged in a furnace body, and the reaction furnace is communicated with the crystallizer to form a circulation loop; a porous pipe and a spiral disc are arranged in the reaction cavity, the porous pipe is communicated with the circulation loop, and the spiral disc is communicated with the closed material bin; the bottom of the reaction furnace is provided with a slag discharging port.
7. A atmospheric argon shield magnesium metal continuous reduction device as claimed in claim 6, wherein the bottom of the reaction chamber is provided with a slag discharging zone, and the slag discharging zone discharges slag through a slag discharging hole.
8. The atmospheric argon shielding metal magnesium continuous reduction device according to claim 6, wherein the slag discharging area comprises a ball slag bin, a powder slag bin, a rotary baffle plate and a slag car from top to bottom, the ball slag bin and the powder slag bin are separated by a partition grate, the powder slag bin is provided with the rotary baffle plate, the rotary baffle plate is a slag discharging port, and the slag car is butted at the slag discharging port.
9. A normal-pressure argon-protected continuous metal magnesium reduction device as claimed in claim 6, wherein the circulation loop is further communicated with a quick cooling fan and a heating cylinder.
10. A continuous atmospheric-pressure argon-shielded metal magnesium reduction apparatus as claimed in claim 6, wherein the spiral disks are distributed along the outer wall of the porous tube in a spiral line, and the spiral disks are provided with heaters at the upper and lower parts.
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| CN105352316A (en) * | 2015-11-07 | 2016-02-24 | 西安奥杰电热设备工程有限责任公司 | Drive heating furnace with screw motion type conveying belt |
| CN106755688A (en) * | 2016-12-15 | 2017-05-31 | 江苏省冶金设计院有限公司 | A kind of cold bound pellet prepares the gas-based shaft kiln and its method of sponge iron |
| CN206607253U (en) * | 2017-03-06 | 2017-11-03 | 江苏省冶金设计院有限公司 | A kind of reduction shaft furnace |
| CN110512094A (en) * | 2019-08-19 | 2019-11-29 | 中国铝业股份有限公司 | It is a kind of cleaning, continuous reducing metal magnesium technique |
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