Calcining furnace for calcining silicon dioxide and production system for producing silicon dioxide
By using rotatable rotary calcining furnace body and grinding medium during the calcining of silica, the problems of uneven compaction and dispersion of materials in traditional calcining are solved, and sufficient calcining, particle size control and performance improvement are achieved.
Patent Information
- Application Number
- CN202421134753.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-23
AI Technical Summary
During the traditional calcination of silica, the materials are piled up and compacted at high temperatures, resulting in physical agglomeration, increasing particle size, uneven dispersion, increasing stress, resulting in failure and cracking.
The rotatable rotary calciner body is used, combined with the grinding medium, and the rotating power assembly of the rotating calciner body is used to continuously rotate the material during the calcining process, increasing the contact area of air or oxygen, preventing compaction and agglomeration, and controlling the powder particle size through the grinding medium.
The material is fully calcined, the residual carbon amount is reduced, the performance of calcined products is improved, the compaction and agglomeration is prevented, the silica is evenly dispersed, stress is reduced, and failure cracking is reduced.
Smart Images
Figure CN222670644U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of silicon dioxide production, in particular to a calcining furnace for calcining silicon dioxide and a production system for producing silicon dioxide. Background Art
[0002] Silicon dioxide has a low dielectric constant and dielectric loss, and is widely used in the copper clad laminate industry. General methods for synthesizing silicon dioxide include physical and chemical methods. Physical melting is used to produce spherical silicon dioxide. The flame is generally formed by the combustion of hydrocarbon fuels such as LPG and NG and oxygen, and a large number of water molecules are produced in the flame. Therefore, there are a large number of polar hydroxyl groups inside and on the surface of the obtained silicon oxide powder, which causes the dielectric loss of the material to increase. High-temperature calcination is required to remove the surface hydroxyl content, thereby reducing the dielectric loss. Chemically synthesized polysiloxanes need to be calcined to completely decompose organic matter into CO2 and H2O, and at the same time, the silicon hydroxyl groups condense to form silicon dioxide. It can be seen that whether it is a physical or chemical method to prepare silicon dioxide, calcination treatment is required.
[0003] Traditional calcination generally uses a sagger or other fixtures to fill the material, and then put it into the calcination furnace for high-temperature calcination. Since the material is piled and compacted in the sagger, the high temperature causes physical agglomeration and agglomeration, and the particle size increases. In subsequent use, the silica filler is unevenly dispersed in the resin, resulting in increased stress, causing failure and cracking. When the material is filled in the sagger, insufficient oxygen at the bottom of the sagger can easily cause insufficient carbonization of the chemically calcined spherical silicon, resulting in increased dielectric loss of the material and affecting its performance.
[0004] In order to avoid the serious consequences of traditional calcination of materials, materials processed by traditional calcination methods are generally reprocessed or crushed into powder by rollers after calcination, which increases the subsequent processing steps and seriously increases costs. Utility Model Content
[0005] The utility model aims to provide a calcining furnace for calcining silicon dioxide and a production system for producing silicon dioxide. The calcining furnace can improve the problems of insufficient calcination of materials, high residual carbon content, agglomeration of materials during calcination, and improve the particle size of powders.
[0006] The embodiment of the utility model is achieved as follows:
[0007] In a first aspect, the utility model provides a calcining furnace for calcining silicon dioxide, which comprises a rotatable rotary calcining furnace body and a grinding medium arranged on the rotary calcining furnace body.
[0008] In an optional embodiment, it further comprises a rotating power assembly for rotating the calcining furnace body, wherein the rotating power assembly is connected to one end of the rotating calcining furnace body.
[0009] In an optional embodiment, the rotating power assembly includes a rotating shaft and a rotating motor, one end of the rotating shaft is connected to one end of the rotating calcining furnace body, and the other end of the rotating shaft is connected to the rotating motor.
[0010] In an optional embodiment, it further comprises a feeding device for transmitting feed to the rotary calcining furnace body, and the feeding device is connected to a feeding port of the rotary calcining furnace body.
[0011] In an optional embodiment, the feeding device includes a storage bin and a screw feeder, the discharge port of the storage bin is connected to one end of the screw feeder, and the other end of the screw feeder is connected to the feeding port of the rotary calcining furnace body.
[0012] In an optional embodiment, it also includes an air inlet pipe, one end of which is connected to a gas source, and the other end is connected to a feed port of the rotary calcining furnace body, and a gas flow meter is also provided on the air inlet pipe.
[0013] In an optional embodiment, it further includes an air outlet pipe, which is connected to the discharge port of the rotary calcining furnace body, and an exhaust fan is provided on the air outlet pipe.
[0014] In an optional embodiment, a heat-insulating layer is further included, and the heat-insulating layer is arranged outside the rotary calcining furnace body to keep the rotary calcining furnace body warm.
[0015] In an optional embodiment, a plurality of heaters are further included, wherein the plurality of heaters are disposed between the heat-insulating layer and the rotary calcining furnace body and heat the rotary calcining furnace body.
[0016] In a second aspect, the utility model provides a production system for producing silicon dioxide, which comprises a calcining furnace for calcining silicon dioxide as described in any one of the aforementioned embodiments.
[0017] The beneficial effects of the embodiments of the utility model are as follows: the utility model adopts a rotatable rotary calcining furnace body, so that the calcined material is continuously rotated during the calcining process to increase the contact area with air or oxygen, so that the material is fully calcined, the residual carbon content is reduced, and the performance of the calcined product is improved. At the same time, the continuous rotation of the material during the calcining process can prevent the material from compacting and agglomerating, reduce the material, and is also conducive to the uniform dispersion of silicon dioxide, reduce stress, reduce failure cracking, etc. The grinding medium is arranged in the rotary calcining furnace body, so that the material can be ground while rotating and calcining, so as to achieve the effect of controlling the particle size of the powder. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0019] Figure 1 A schematic structural diagram of a calcining furnace for calcining silicon dioxide provided in an embodiment of the utility model.
[0020] Icons: 100-calcining furnace; 110-rotating calcining furnace body; 111-lining; 112-discharging port of rotating calcining furnace body; 120-rotating power assembly; 121-rotating shaft; 122-rotating motor; 130-grinding medium; 140-feeding device; 141-storage bin; 142-screw feeder; 143-discharging port of storage bin; 150-inlet pipe; 151-gas source; 152-gas flow meter; 160-insulation layer; 161-heater; 162-temperature controller; 163-outlet pipe; 164-exhaust fan. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0024] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0025] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0027] Example
[0028] Please refer to Figure 1 This embodiment provides a calcining furnace 100 for calcining silicon dioxide, which includes a rotatable rotary calcining furnace body 110, which is divided into a furnace body front area, a furnace body internal area and a furnace body rear area, and the above three areas are connected in sequence. The furnace body internal area is a cylindrical structure placed flat, and the utility model uses alumina high wear-resistant ceramics to form the inner lining 111 of the furnace body; the furnace body front area and the furnace body rear area are overall in a "horn" shape.
[0029] It can be understood that the above-mentioned flat cylindrical structure and the "trumpet" shape are examples of the present invention, and the front area of the furnace body, the inner area of the furnace body and the rear area of the furnace body can also adopt other geometric shapes in the prior art.
[0030] A grinding medium 130 is disposed in the rotary calcining furnace body 110 , and the grinding medium 130 can grind the calcined material in the rotary calcining furnace body 110 to achieve the effect of controlling the particle size of the powder.
[0031] The grinding medium 130 used in the present invention can be grinding medium 130 that can be purchased in the prior art, for example, including but not limited to alumina balls, zirconium oxide balls, etc.
[0032] It also includes a rotary power assembly 120 that rotates the rotary calcining furnace body 110, and the rotary power assembly 120 is connected to one end of the rotary calcining furnace body 110. Specifically, the rotary power assembly 120 includes a rotating shaft 121 and a rotating motor 122, one end of the rotating shaft 121 is connected to one end of the rotary calcining furnace body 110, that is, connected to the front area of the rotary calcining furnace 100, and the other end of the rotating shaft 121 is connected to the rotating motor 122, and then the motor drives the rotating shaft 121 to rotate, and then drives the entire rotary calcining furnace body 110 to rotate around the axis; so that the material in the rotary calcining furnace body 110 also rotates, preventing the material from being compacted and agglomerated, which is conducive to the uniform mixing of the material in the rotary calcining furnace body 110, reducing the increase of stress, and reducing failure and cracking. At the same time, the rotary calcining furnace body 110 continuously rotates during the calcining process to increase the contact area between the material and the air / oxygen, prevent insufficient blackening during calcination, reduce the amount of residual carbon, and improve the performance of the material formed by calcination. During the calcining process, the rotating calcining furnace body 110 rotates continuously, and the grinding media 130 also continuously acts on the calcined material, so that the calcined material is continuously ground, and then the particle size can be controlled.
[0033] Furthermore, the calcining furnace 100 also includes a feeding device 140 for transmitting feed to the rotary calcining furnace body 110 , and the feeding device 140 is connected to the feeding port of the rotary calcining furnace body 110 , that is, the feeding device 140 is connected to the front area of the rotary calcining furnace body 110 .
[0034] Specifically, the feeding device 140 includes a storage bin 141 and a screw feeder 142, the discharge port 143 of the storage bin is connected to one end of the screw feeder 142, and the other end of the screw feeder 142 is connected to the feed port of the rotary calcining furnace body 110. The material to be calcined in the storage bin 141 is transported to the rotary calcining furnace body 110 through the screw feeder 142 for calcination to form silicon dioxide.
[0035] It should be noted that the storage bin 141 and the screw feeder 142 used in the present invention can be selected from storage devices and rotary feeding devices available in the prior art.
[0036] Furthermore, the calcining furnace 100 further includes an air inlet pipe 150 , one end of which is connected to a gas source 151 , and the other end of which is connected to a feed port of the rotary calcining furnace body 110 , so that oxygen or air can be introduced into the rotary calcining furnace body 110 .
[0037] A gas flow meter 152 is also provided on the air inlet pipe 150 to detect the oxygen or air entering the rotary calcining furnace body 110 to prevent the oxygen or air content in the rotary calcining furnace body 110 from being too low or too high, which is beneficial to ensure the calcining effect.
[0038] Furthermore, the calcining furnace 100 further includes a heat-insulating layer 160, which is disposed outside the rotary calcining furnace body 110 to insulate the rotary calcining furnace body 110. Specifically, the heat-insulating layer 160 is disposed outside the inner area of the furnace body to insulate the calcining area.
[0039] The calcining furnace 100 also includes a plurality of heaters 161 , which are disposed between the insulation layer 160 and the rotary calcining furnace body 110 , that is, the plurality of heaters 161 are disposed outside the inner area of the furnace body but within the insulation layer 160 , thereby heating the inner area of the rotary calcining furnace body 110 .
[0040] It should be noted that the heater 161 used in the present invention can be a natural gas combustion mixer, or a thermocouple heated by electrodes, that is, the calcining furnace 100 can be heated by gas or by electrodes.
[0041] The calcining furnace 100 further includes a temperature controller 162 to monitor the temperature of the rotating calcining furnace body 110 to prevent the temperature from being too high or too low.
[0042] The calcining furnace 100 further includes an air outlet pipe 163 , which is in communication with the discharge port 112 of the rotary calcining furnace body, and an exhaust fan 164 is disposed on the air outlet pipe 163 .
[0043] The utility model adopts gas heating and thermocouple temperature measurement, and the temperature can be adjusted by itself; the upper front area of the rotary calcining furnace body 110 is connected to the gas source 151, and the gas source 151 can select air or oxygen according to the process; the rear area of the rotary calcining furnace body 110 is provided with an exhaust pipe, which can timely remove the waste gas generated in the cavity to ensure the furnace pressure; the material is under the set temperature, atmosphere and rotary grinding state, and the two functions of calcination and grinding are realized at the same time; after the calcination is completed, the heating system is closed, and the gas source 151 is automatically connected to the air to start rapid cooling, and the material temperature can be discharged from the discharge port when it drops to room temperature.
[0044] In a second aspect, the utility model provides a production system for producing silicon dioxide, which comprises a calcining furnace 100 for calcining silicon dioxide as described in any one of the aforementioned embodiments.
[0045] The utility model also provides a method for preparing silicon dioxide using the calcining furnace 100 for calcining silicon dioxide, wherein the silicon dioxide is prepared by chemical calcination, and the corresponding resin is transported to the rotary calcining furnace body 110 through the storage bin 141 and the screw feeder 142, and then the rotary calcining furnace body 110 is rotated and calcined, and the material is ground by the grinding medium 130, and then the material is discharged. Among them, the rotation speed is 10-30HZ, for example, any value between 10HZ, 15HZ, 20HZ, 25HZ and 30HZ. The calcining temperature is 750-1050°C, for example, any value between 750-1050°C, such as 750°C, 800°C, 850°C, 900°C, 950°C, 1000°C and 1050°C. The calcination time is 5-12 hours, for example, any value between 5 hours, 7 hours, 8 hours, 9 hours, 10 hours and 12 hours. The grinding medium 130 is alumina / zirconia, and the ball mass ratio is 1:2-5, for example, any value between 1:2, 1:3, 1:4 and 1:5. The intake air flow rate is 100-200 L / min, for example, any value between 100-200 L / min, 110 L / min, 120 L / min, 130 L / min, 140 L / min, 150 L / min, 160 L / min, 170 L / min, 180 L / min, 190 L / min and 200 L / min.
[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A calcining furnace for calcining silicon dioxide, characterized in that: It includes a rotatable rotary calcining furnace body and a grinding medium arranged in the rotary calcining furnace body; It also includes a rotary power assembly for rotating the calcining furnace body, wherein the rotary power assembly is connected to one end of the rotary calcining furnace body; The rotary power assembly comprises a rotary shaft and a rotary motor, one end of the rotary shaft is connected to one end of the rotary calcining furnace body, and the other end of the rotary shaft is connected to the rotary motor; It includes an air inlet pipe, one end of which is connected to a gas source, and the other end is connected to a feed port of the rotary calcining furnace body, and a gas flow meter is also provided on the air inlet pipe; It also includes a heat-insulating layer, which is arranged outside the rotary calcining furnace body to keep the rotary calcining furnace body warm; The invention also comprises a plurality of heaters, which are arranged between the heat-insulating layer and the rotary calcining furnace body and heat the rotary calcining furnace body.
2. The calcining furnace for calcining silicon dioxide according to claim 1, characterized in that: It also includes a feeding device for transmitting feed to the rotary calcining furnace body, and the feeding device is communicated with the feeding port of the rotary calcining furnace body.
3. The calcining furnace for calcining silicon dioxide according to claim 2, characterized in that: The feeding device comprises a storage bin and a screw feeder, the discharge port of the storage bin is connected to one end of the screw feeder, and the other end of the screw feeder is connected to the feeding port of the rotary calcining furnace body.
4. The calcining furnace for calcining silicon dioxide according to claim 1, characterized in that: It also includes an air outlet pipe, which is connected to the discharge port of the rotary calcining furnace body, and an exhaust fan is arranged on the air outlet pipe.
5. A production system for producing silicon dioxide, characterized in that: The invention comprises the calcining furnace for calcining silicon dioxide according to any one of claims 1 to 4.