Inorganic powder stirring smelting furnace and inorganic powder preparation method

Abstract

The invention relates to an inorganic powder smelting reactor and a modularly-designed smelting reactor, which are combined with a bypass loop using a capillary viscometer and are used for monitoring the viscosity of a molten material in real time and providing continuous feedback for a reactor control system, so that the stirring speed, temperature and gas flow can be adjusted in real time in the smelting process, and the smelting efficiency is improved. The material consistency, the product quality and the process control capability in a high-temperature environment are improved, and through the modular design, the production of various inorganic powder materials can be adapted by quickly replacing different modules.

Description

Technical Field

[0001] The invention relates to the field of inorganic powder preparation, and in particular to an inorganic powder stirring smelting furnace and an inorganic powder preparation method. Background Art

[0002] In the production process of inorganic powders, melting operations are required to obtain high-quality products. Traditional melting furnaces often have problems such as uneven stirring, imprecise temperature control, and low energy utilization when melting inorganic powders. These problems not only affect the quality of the product, but also increase production costs and production cycles.

[0003] Patent document CN219264953U discloses a solid electrolyte connected light-duty furnace. Through a fixed clamping device composed of a firing base, a fixed seat, a telescopic guide rod, an arc-shaped clamping plate, a threaded rod, a threaded sleeve, a support plate and other components, the objects to be fired can be placed directly in the furnace body, thereby improving the quality of firing and molding.

[0004] Patent document CN219199967U discloses a kiln for solid electrolyte sintering, comprising: a furnace body, a transmission assembly for transmitting saggers at least partially disposed in the furnace body, a heating assembly disposed in the furnace body and used to be located above and below the saggers, respectively, and a collision induction assembly disposed in the furnace body. The collision induction assembly comprises a plurality of guide wheel groups disposed above the rollers and matched with a plurality of rollers one-to-one, each guide wheel group comprises a pair of guide wheels corresponding to two axial ends of the rollers, respectively, and a collision induction unit matched with each guide wheel.

[0005] Patent document CN217005315U discloses a sintering device for a solid electrolyte continuous roller furnace, which relates to the technical field of roller furnaces, and is intended to solve the problem that the existing solid electrolyte continuous roller furnace sintering device has a high temperature of waste fume recovery and purification, and consumes a lot of purification materials. Support columns are arranged at the four corners of the lower end of the roller furnace, a high temperature resistant upper cover is arranged at the upper end of the roller furnace, a driving roller is arranged on the inner wall of the roller furnace, roller shaft driving motors are arranged at both ends of the driving roller, electric heaters are arranged on both sides above the driving roller, an exhaust gas cooling box is arranged at the upper end of the high temperature resistant upper cover, an exhaust gas purification box is arranged at the front end of the exhaust gas cooling box, and a smoke exhaust fan is arranged at the upper end of the inner wall of the high temperature resistant upper cover.

[0006] Patent document CN217844716U discloses a solid electrolyte connected light road furnace, which relates to the field of kiln technology. In order to solve the problem in the prior art that the temperature in the middle of the kiln is consistent with the temperature at both ends so that the heating is uniform, but the interior of the kiln does not have a placement mechanism, so when firing, it needs to be placed directly inside the furnace body, which is prone to instability during firing, thus affecting the quality of firing molding. A placement plate is arranged inside the firing kiln, and a placement groove is arranged inside the placement plate; a limit seat is arranged inside the placement groove, and nine limit seats are arranged. The surfaces of the firing kiln and the sealing door body are both installed with fastening frames, and a lock buckle is installed on one side of the sealing door body, and three lock buckles are installed. The sealing door body is fixedly connected to one end face of the firing furnace body through the lock buckle, and connecting edges are arranged on both sides of the placement plate, and two connecting edges are arranged.

[0007] The above-mentioned traditional smelting reactors are usually fixed structure designs, which are difficult to adapt to the production needs of different inorganic powders. This results in the reactor needing to be shut down for reorganization or equipment replacement when processing different materials, which increases production time and cost. At the same time, the traditional stirring method may cause uneven stirring. Therefore, advanced stirring devices and temperature control technologies are developed in inorganic powder stirring smelting furnaces to improve the inorganic powder materials to be more fully and evenly stirred during the smelting process. Further improving the consistency and performance stability of inorganic powders are technical problems that need to be solved urgently. Summary of the invention

[0008] In response to the shortcomings of the prior art, the present application provides an inorganic powder stirring smelting furnace and an inorganic powder system. Through improvements to the equipment, the consistency of materials, product quality and process control capabilities under high temperature environments are improved. At the same time, the adaptability of the equipment is improved, enabling it to better adapt to the preparation needs of different inorganic powders.

[0009] In order to achieve the above object, the present invention adopts the following technical solution:

[0010] An inorganic powder stirring smelting furnace, comprising a square furnace body 102, four furnace door locks 103 installed on the front of the square furnace body 102, a positive and negative pressure gauge 104 and a control box 106 installed on the top of the square furnace body 102, an observation window 205 is also provided on the top of the furnace body 102, a lifting and stirring mechanism 105 installed on the top of the square furnace body 102, an overpressure control exhaust valve 107 and a vacuum interface 108 installed on the side of the square furnace body 102, characterized in that a square furnace door 208 is provided on the front of the square furnace body 102, a square furnace door sealing ring 209 is installed around the square furnace door 208, an insulation board 210 is installed on the inner surface of the square furnace door 208, a heating cylindrical smelting furnace 203 is provided in the square furnace body 102, the The heating cylindrical melting furnace 203 is placed on the heating cylindrical melting furnace moving module 202. The heating cylindrical melting furnace 203 can be freely moved in and out of the furnace body through the heating cylindrical melting furnace moving module 202. The lifting and stirring mechanism 105 passes through the top plate of the square furnace body 102 and enters the square furnace body 102. When stirring is required, the lifting and stirring mechanism 105 extends the stirring device into the heating cylindrical melting furnace 203. When stirring is not required, the lifting and stirring mechanism 105 moves the stirring device out of the heating cylindrical melting furnace 203. The heating cylindrical melting furnace 203 is movably installed on the heating cylindrical melting furnace moving module 202, and the heating cylindrical melting furnace 203 can be replaced according to the smelting conditions of different types of inorganic powders.

[0011] Furthermore, the heated cylindrical melting furnace 203 includes a graphite crucible 304 and an electric heating jacket arranged on the outer ring of the graphite crucible 304. A capillary viscometer is provided on the inner wall of the graphite crucible 304 for real-time monitoring of the viscosity of the molten material.

[0012] Furthermore, the heating cylindrical melting furnace moving module 202 includes a guide rail 301, a slider (302), a transmission gear 305, a servo motor 306 and a transmission rack 307. The guide rail 301 is composed of two parallel tracks. The servo motor 306 is installed between the guide rails 301. The servo motor 306 is connected to the transmission gear 305 in a transmission manner. The slider 302 is installed on the guide rail 301. The transmission rack 307 is fixedly connected to the side of the slider 302 and is connected to the transmission gear 305 in a transmission manner. A base is fixed on the guide rail 301, and the heating cylindrical melting furnace moving module 202 is non-fixedly installed on the base.

[0013] Furthermore, the lifting and stirring mechanism 105 includes a stirring bearing seat 206 and a stirring transmission shaft 207. The lifting shaft 413 is movably installed in the stirring bearing seat 206 through a lifting shaft linear bearing 409 and a lifting shaft sleeve 407. The stirring transmission shaft 207 passes through the lifting shaft 413 and the stirring bearing seat 206 and is connected to one end of the alumina connecting rod 403 through a transmission shaft connecting sleeve 404. Two transmission shaft high-temperature bearings 405 are provided at the bottom of the stirring bearing seat 206 that contacts the stirring transmission shaft 207. A stirring paddle connecting sleeve 402 is installed at the other end of the alumina connecting rod 403. The stirring paddle 401 is connected to the alumina connecting rod 403 through the stirring paddle connecting sleeve 402. One end of the stirring motor bracket 412 is connected to the lifting electric cylinder 414, and the other end is connected to the lifting shaft 413. The lifting shaft 413 is driven up and down by the up and down movement of the lifting electric cylinder 414, which ultimately drives the graphite stirring paddle 401 to move up and down.

[0014] Furthermore, the insulation board material is a high temperature resistant organic material or a high temperature resistant organic material, preferably an aluminum oxide material.

[0015] Furthermore, the stirring paddle is made of an inert high temperature resistant material, preferably graphite.

[0016] On the other hand, the present invention also provides an inorganic powder preparation system, including the inorganic powder stirring and smelting furnace as described above, and the system also includes an inorganic powder sand grinding device, the sand grinding device and the smelting furnace are connected, the inorganic powder material is first stirred and smelted in the smelting furnace, and then the slurry is passed into the sand grinding device for sand grinding, and then the sand ground slurry is continued to be passed into the smelting furnace for smelting, and the above steps are repeated until the inorganic powder material that meets the requirements is obtained.

[0017] On the other hand, the present invention also provides a method for using the inorganic powder preparation system described above, characterized in that the inorganic powder raw materials with good proportions are placed in the graphite crucible 304 container, and the heated cylindrical smelting furnace 303 is moved to the center of the graphite stirring paddle 401 by heating the cylindrical smelting chamber moving module guide rail 301. The square furnace door 208 is closed, the vacuum interface 108 is connected to the vacuum pump to extract the air in the square furnace body 102, and the vacuum interface 108 is injected with inert gas to provide a suitable reaction environment for the synthesis of inorganic powder. The set temperature control program is started, the heated cylindrical smelting furnace 203 is heated and smelted to heat the inorganic powder material, and the melting state of the inorganic powder material is observed through the observation window 205. When the material reaches a molten state, the lifting cylinder 414 descends to the stirring position, and the stirring motor 410 starts to drive the graphite stirring paddle 401 to stir the inorganic powder. After stirring for a certain period of time, the lifting cylinder 414 raises the stirring device, and then moves the inorganic powder out of the furnace body through the moving module 202, and transfers the inorganic powder slurry to the sand grinding device for sand grinding. After sand grinding for a period of time, the sand ground slurry is transferred to the heated cylindrical melting furnace 203 for melting and stirring, and the above steps are repeated until the inorganic powder material that meets the requirements is obtained.

[0018] Furthermore, the sand milling device is a sand mill, and the number of sand milling is selected according to the type of electrolyte, preferably 2-5 times.

[0019] Furthermore, sand grinding is also performed under an inert atmosphere.

[0020] The beneficial effects of the present invention are:

[0021] (1) In the present invention, a capillary viscometer is arranged in the inorganic powder smelting reactor to monitor the viscosity of the molten material in real time and provide continuous feedback to the reactor control system, so that the stirring speed, temperature and gas flow rate can be adjusted in real time during the smelting process. This can further improve the consistency of the inorganic powder material, the product quality and the process control capability in a high temperature environment.

[0022] (2) The present invention proposes a modularly designed smelting reactor, in which a heating cylindrical smelting furnace is flexibly mounted on a movable bottom plate, and can adapt to the production of various inorganic powder materials by quickly replacing different heating furnaces. Different smelting furnaces are selected according to the smelting conditions of different types of inorganic powders. This avoids the need to shut down the reactor for reorganization or replacement of equipment when processing different materials, thereby reducing production time and cost.

[0023] (3) In the process of preparing inorganic powders, the smelting furnace and the sand milling device are integrated, and the slurry is circulated at regular intervals, which solves the problems of insufficient stirring, stirring dead corners and high energy consumption that are usually existing in the stirring device. In particular, in the processing of high-viscosity or multi-phase materials, the traditional stirring blade design often cannot provide sufficient mixing effect. The present invention discloses a unique stirring mechanism that combines smelting and sand milling to greatly improve the mixing effect. In addition, the stirring blade is easily damaged or fails in a high-temperature environment, resulting in a decrease in production efficiency and an increase in maintenance costs. The present application uses graphite material as the stirring blade, which improves the high-temperature resistance of the blade and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the overall front view of the inorganic powder stirring smelting furnace of the present invention.

[0025] Figure 2 It is an overall front view of the internal structure of the inorganic powder stirring smelting furnace of the present invention.

[0026] Figure 3 It is an overall front view of the internal heating cylindrical melting furnace moving module and the heating cylindrical melting furnace of the inorganic powder stirring melting furnace of the present invention.

[0027] Figure 4 The figure is an overall front view of the stirring device of the inorganic powder stirring smelting furnace of the present invention. DETAILED DESCRIPTION

[0028] To make the technical solutions and advantages of the present invention more clear, the present invention and its beneficial effects will be described in further detail below in conjunction with specific implementation methods and accompanying drawings, but the implementation methods of the present invention are not limited thereto.

[0029] In the present invention, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple.

[0030] See also Figure 1-2An embodiment of the present invention is as follows: an inorganic powder stirring smelting furnace, comprising a square furnace body 102, four furnace door locks 103 installed on the front of the square furnace body 102, a positive and negative pressure gauge 104 and a control box 106 installed on the top of the square furnace body 102, an observation window 205 is also provided on the top of the furnace body 102, a lifting and stirring mechanism 105 installed on the top of the square furnace body 102, an overpressure control exhaust valve 107 and a vacuum interface 108 installed on the side of the square furnace body 102, characterized in that a square furnace door 208 is provided on the front of the square furnace body 102, a square furnace door sealing ring 209 is installed around the square furnace door 208, an insulation board 210 is installed on the inner surface of the square furnace door 208, and a heating cylinder 210 is provided in the square furnace body 102. The heating cylindrical melting furnace 203 is placed on the heating cylindrical melting furnace moving module 202. The heating cylindrical melting furnace 203 can be freely moved in and out of the furnace body through the heating cylindrical melting furnace moving module 202. The lifting and stirring mechanism 105 passes through the top plate of the square furnace body 102 and enters the square furnace body 102. When stirring is required, the lifting and stirring mechanism 105 extends the stirring device into the heating cylindrical melting furnace 203. When stirring is not required, the lifting and stirring mechanism 105 moves the stirring device out of the heating cylindrical melting furnace 203. The heating cylindrical melting furnace 203 is movably installed on the heating cylindrical melting furnace moving module 202, and the heating cylindrical melting furnace 203 can be replaced according to the smelting conditions of different types of inorganic powders.

[0031] See also Figure 3 The heating cylindrical melting furnace 203 includes a graphite crucible 304 and an electric heating jacket arranged on the outer ring of the graphite crucible 304, and a capillary viscometer is provided on the inner wall of the graphite crucible 304 for real-time monitoring of the viscosity of the molten material, and for providing continuous feedback to the reactor control system, so that the stirring speed, temperature and gas flow rate can be adjusted in real time during the smelting process. This can further improve the consistency of the inorganic powder material, the product quality and the process control capability under high temperature environment.

[0032] See also Figure 3 The heated cylindrical melting furnace moving module 202 includes a guide rail 301, a slider 302, a transmission gear 305, a servo motor 306 and a transmission rack 307. The guide rail 301 is composed of two parallel tracks. The servo motor 306 is installed between the guide rails 301. The servo motor 306 is connected to the transmission gear 305 in a transmission manner. The slider 302 is installed on the guide rail 301. The transmission rack 307 is fixedly connected to the side of the slider 302 and is connected to the transmission gear 305 in a transmission manner. A base is fixed on the guide rail 301, and the hot cylindrical melting furnace moving module 202 is non-fixedly installed on the base.

[0033] See also Figure 4The lifting and stirring mechanism 105 includes a stirring bearing seat 206 and a stirring transmission shaft 207. The lifting shaft 413 is movably installed in the stirring bearing seat 206 through a lifting shaft linear bearing 409 and a lifting shaft sleeve 407. The stirring transmission shaft 207 passes through the lifting shaft 413 and the stirring bearing seat 206 and is connected to one end of the alumina connecting rod 403 through a transmission shaft connecting sleeve 404. Two transmission shaft high-temperature bearings 405 are provided at the bottom of the stirring bearing seat 206 that contacts the stirring transmission shaft 207. A stirring paddle connecting sleeve 402 is installed at the other end of the alumina connecting rod 403. The stirring paddle 401 is connected to the alumina connecting rod 403 through the stirring paddle connecting sleeve 402. One end of the stirring motor bracket 412 is connected to the lifting electric cylinder 414, and the other end is connected to the lifting shaft 413. The lifting shaft 413 is driven up and down by the lifting electric cylinder 414, and finally the graphite stirring paddle 401 is driven up and down. The above-mentioned insulation board material is a high-temperature resistant organic material or a high-temperature resistant organic material, preferably an alumina material, which can further improve the thermal insulation performance of the device and reduce energy consumption.

[0034] In this embodiment, the material of the stirring paddle is an inert high-temperature resistant material, preferably graphite. The stirring paddle is easily damaged or fails in a high-temperature environment, resulting in decreased production efficiency and increased maintenance costs. This application uses graphite material as the stirring paddle, which improves the high-temperature resistance of the paddle and improves production efficiency.

[0035] In another embodiment, an inorganic powder preparation system is also provided, including the inorganic powder stirring and smelting furnace as described above, the system also includes an inorganic powder sand grinding device (the specific device schematic diagram is not drawn), the sand grinding device is preferably a sand mill, and the sand grinding is also carried out under an inert atmosphere. The sand grinding device and the smelting furnace are connected, the inorganic powder material is first stirred and smelted in the smelting furnace, and then the slurry is passed into the sand grinding device for sand grinding, and then the sand ground slurry is continued to be passed into the smelting furnace for smelting, and the above steps are repeated until the inorganic powder material that meets the requirements is obtained.

[0036] The working principle of the above system is: put the inorganic powder raw materials with good proportion into the graphite crucible 304 container, and heat the cylindrical melting furnace 303 to move the guide rail 301 of the heated cylindrical melting chamber to the center of the graphite stirring paddle 401. Close the square furnace door 208, connect the vacuum interface 108 to the vacuum pump to extract the air in the square furnace 102, and inject inert gas into the vacuum interface 108 to provide a suitable reaction environment for the synthesis of inorganic powder. Start the set temperature control program, heat the cylindrical melting furnace 203 to heat and melt the inorganic powder material, and observe the melting state of the inorganic powder material through the observation window 205. When the material reaches a molten state, the lifting cylinder 414 descends to the stirring position, and the stirring motor 410 starts to drive the graphite stirring paddle 401 to stir the inorganic powder. After stirring for a certain period of time, the lifting cylinder 414 raises the stirring device, and then moves the inorganic powder out of the furnace body through the moving module 202, and transfers the inorganic powder slurry to the sand grinding device for sand grinding. After sand grinding for a period of time, the sand ground slurry is transferred to the heated cylindrical melting furnace 203 for melting and stirring, and the above steps are repeated until the inorganic powder material that meets the requirements is obtained.

[0037] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. An inorganic powder stirring smelting furnace, comprising a square furnace body (102), four furnace door locks (103) installed on the front of the square furnace body (102), a positive and negative pressure gauge (104) and a control box (106) installed on the top of the square furnace body (102), the top of the furnace body (102) is also provided with an observation window (205), a lifting stirring mechanism (105) installed on the top of the square furnace body (102), an overpressure control exhaust valve (107) and a vacuum interface (108) installed on the side of the square furnace body (102), characterized in that: The square furnace body (102) is provided with a square furnace door (208) on the front side, and a square furnace door sealing ring (209) is installed around the square furnace door (208). An insulation board (210) is installed on the inner surface of the square furnace door (208). A heating cylindrical smelting furnace (203) is provided in the square furnace body (102). The heating cylindrical smelting furnace (203) is placed on the heating cylindrical smelting furnace moving module (202). The heating cylindrical smelting furnace (203) is transported to the inside and outside of the furnace body by the heating cylindrical smelting furnace moving module (202). The lifting and stirring The stirring mechanism (105) passes through the top plate of the square furnace body (102) and enters the square furnace body (102). When stirring is required, the lifting stirring mechanism (105) extends the stirring device into the heating cylindrical melting furnace (203). When stirring is not required, the lifting stirring mechanism (105) moves the stirring device out of the heating cylindrical melting furnace (203). The heating cylindrical melting furnace (203) is movably installed on the heating cylindrical melting furnace moving module (202), and the heating cylindrical melting furnace (203) can be replaced according to the melting conditions of different types of inorganic powders.

2. The inorganic powder stirring smelting furnace according to claim 1, characterized in that: The heated cylindrical melting furnace (203) comprises a graphite crucible (304) and an electric heating sleeve arranged on the outer ring of the graphite crucible (304). A capillary viscometer is arranged on the inner wall of the graphite crucible (304) for real-time monitoring of the viscosity of the molten material.

3. The inorganic powder stirring smelting furnace according to claim 1, characterized in that: The heating cylindrical melting furnace moving module (202) comprises a guide rail (301), a slider (302), a transmission gear (305), a servo motor (306) and a transmission rack (307), wherein the guide rail (301) is composed of two parallel tracks, the servo motor (306) is installed between the guide rails (301), the servo motor (306) is transmission-connected to the transmission gear (305), the slider (302) is installed on the guide rail (301), the transmission rack (307) is fixedly connected to the side of the slider (302) and is transmission-connected to the transmission gear (305), a base is fixed on the guide rail (301), and the heating cylindrical melting furnace moving module (202) is non-fixedly installed on the base.

4. The inorganic powder stirring smelting furnace according to claim 1, characterized in that: The lifting and stirring mechanism (105) comprises a stirring bearing seat (206) and a stirring transmission shaft (207); the lifting shaft (413) is movably installed in the stirring bearing seat (206) through a lifting shaft linear bearing (409) and a lifting shaft sleeve (407); the stirring transmission shaft (207) passes through the lifting shaft (413) and the stirring bearing seat (206) and is connected to one end of an alumina connecting rod (403) through a transmission shaft connecting sleeve (404); the bottom of the stirring bearing seat (206) in contact with the stirring transmission shaft (207) is provided with Two transmission shaft high-temperature bearings (405); the other end of the alumina connecting rod (403) is installed with a stirring paddle connecting sleeve (402); the stirring paddle (401) is connected to the alumina connecting rod (403) through the stirring paddle connecting sleeve (402); one end of the stirring motor bracket (412) is connected to the lifting cylinder (414), and the other end is connected to the lifting shaft (413); the lifting shaft (413) is driven to move up and down by the lifting cylinder (414), and finally the graphite stirring paddle (401) is driven to move up and down.

5. The inorganic powder stirring smelting furnace according to claim 1, characterized in that: The insulation board material is a high temperature resistant organic material or a high temperature resistant organic material, preferably an aluminum oxide material.

6. The inorganic powder stirring smelting furnace according to claim 4, characterized in that: The stirring paddle is made of an inert high temperature resistant material, preferably graphite.

7. An inorganic powder preparation system, comprising the inorganic powder stirring smelting furnace according to any one of claims 1 to 6, the system also comprising an inorganic powder sand grinding device, the sand grinding device and the smelting furnace are connected, the inorganic powder material is first stirred and smelted in the smelting furnace, and then the slurry is passed into the sand grinding device for sand grinding, and then the sand ground slurry is continued to be passed into the smelting furnace for smelting, and the above steps are repeated until the inorganic powder material that meets the requirements is obtained.

8. A method for using the inorganic powder preparation system as claimed in claim 7, characterized in that: Put the inorganic powder raw materials with good proportion into the graphite crucible (304) container, and heat the cylindrical melting furnace (303) to move the module guide rail (301) of the heated cylindrical melting chamber to the center position of the graphite stirring paddle (401). Close the square furnace door (208), connect the vacuum interface (108) to the vacuum pump to extract the air in the square furnace (102), and inject inert gas into the vacuum interface (108) to provide a suitable reaction environment for the synthesis of inorganic powder. Start the set temperature control program, heat the cylindrical melting furnace (203) to heat and melt the inorganic powder material, and observe the melting state of the inorganic powder material through the observation window (205). When the material reaches a molten state, the lifting cylinder (414) descends to the stirring position, and the stirring motor (410) starts to drive the graphite stirring paddle (401) to stir the inorganic powder. After stirring for a certain period of time, the lifting cylinder (414) rises the stirring device, and then the inorganic powder is moved out of the furnace body through the moving module (202), and the inorganic powder slurry is transferred to the sand milling device for sand milling. After sand milling for a period of time, the sand milled slurry is transferred to the heated cylindrical melting furnace (203) for melting and stirring, and the above steps are repeated until the inorganic powder material that meets the requirements is obtained.

9. The method according to claim 7, characterized in that: The sand milling device is a sand mill, and the number of sand milling is selected according to the type of inorganic powder, preferably 2-5 times.

10. The method according to claim 7, characterized in that The sand milling is carried out under an inert atmosphere.

Images