A high-iron-based building insulation special artificial crystal mica large sheet preparation equipment and preparation method

Abstract

The application discloses a kind of high-iron infrastructure special artificial crystal mica large sheet preparation equipment, it is characterized in that, it includes pedestal body, melt furnace being installed above pedestal body, heating body and graphite mould being installed at melt furnace central axis, the top of the melt furnace is provided with feed inlet;The base and the bottom of the melt furnace are filled with filler, the bottom of the graphite mould is buried in the filler, and the upper part of the graphite mould is above the filler;The graphite mould is connected by upper body and lower body and is composed, and the upper body and the lower body are communicated by connecting hole. The equipment can prepare 10-60cm 2 size mica large sheet.

Description

Technical Field

[0001] This invention relates to the field of artificial crystal mica sheet preparation technology, specifically to a special artificial crystal mica sheet for high-speed railway infrastructure insulation components. Background Technology

[0002] Mica is a crystalline material with excellent insulation, corrosion resistance, and high-temperature resistance, making it widely used in various fields. Currently, the main synthesis methods include the hydrothermal method, the high-temperature melting method, and the crucible method. Initially, the primary research objective was to replace natural mica as an insulating material in electronic components and the power industry. Therefore, large crystal size (area) was required, i.e., a high yield of flaked mica. Consequently, research and development focused more on the growth of crystal flakes.

[0003] However, the current method of preparing synthetic mica crystal sheets by high-temperature melting has the disadvantage that most of the resulting crystal sheets are small. Although these small crystal sheets can be used to make synthetic mica paper, and then synthetic mica boards, synthetic mica tapes and various insulating products, their usage is limited, which restricts the development of the industry. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects in the prior art and provide a large artificial crystal mica sheet for high-speed rail infrastructure insulation components, which can effectively solve the above-mentioned problems in the prior art.

[0005] To achieve the above objectives, the technical solution of the present invention is to provide a device for preparing large artificial crystal mica sheets for high-speed railway infrastructure insulation components. The device is characterized in that it includes a base body, a furnace installed above the base body, a heating element installed at the central axis of the furnace, and a graphite mold. The furnace has a feed inlet at the top. The base body and the bottom of the furnace are filled with filler, the bottom of the graphite mold is buried in the filler, and the upper part of the graphite mold is located above the filler. The graphite mold is composed of an upper body and a lower body connected together, and the upper body and the lower body are connected by a connecting hole.

[0006] Furthermore, the diameter of the connecting hole is 1-5cm.

[0007] Furthermore, the upper body has a bowl-shaped structure, and the lower body has a cylindrical structure.

[0008] Furthermore, it also includes a dispersion body, which is provided at the top of the lower body. The dispersion body is a circular plate-shaped structure that conforms to the inner wall of the lower body, and the dispersion body has a number of dispersion holes.

[0009] Furthermore, the diameter of the dispersion hole is 1-5 cm. The diameter of the dispersion hole is smaller than the diameter of the connecting hole.

[0010] Furthermore, the height of the graphite mold is 1 / 4 to 1 / 2 of the height of the furnace.

[0011] Preferably, the height of the graphite mold is 1 / 3 of the height of the furnace.

[0012] Furthermore, the height ratio of the upper body to the lower body of the graphite mold is 1 to 5 / 3.

[0013] Preferably, the height ratio of the upper body to the lower body of the graphite mold is 5:3.

[0014] Furthermore, the raw materials include, by weight, 30-40 parts of quartz sand, 25-35 parts of fused magnesia, 10-30 parts of potassium fluorosilicate, 5-15 parts of alumina, and 1-5 parts of potassium carbonate.

[0015] Preferably, the raw materials include, by weight, 36 parts of quartz sand, 30 parts of fused magnesia, 20 parts of potassium fluorosilicate, 12 parts of alumina, and 2 parts of potassium carbonate.

[0016] Furthermore, the filler is an unmelted solid from the raw material.

[0017] Furthermore, the filler is filled upwards to the bottom 1 / 3 position of the furnace.

[0018] Furthermore, the inner wall of the furnace is provided with a high-temperature resistant component, which includes graphite felt and ceramic fiber felt. The ceramic fiber felt is attached to the inner wall of the furnace, and the graphite felt is attached to the ceramic fiber felt. The furnace wall is provided with several cutting slits.

[0019] Furthermore, the width of the cutting slit is 2-3 mm.

[0020] Furthermore, the cutting slit is arranged laterally.

[0021] Furthermore, the furnace wall thickness is 8-15mm.

[0022] Furthermore, the furnace wall thickness is 10 mm.

[0023] Furthermore, the thickness of the ceramic fiber felt is 40-60 mm.

[0024] Furthermore, the thickness of the ceramic fiber felt is 50 mm.

[0025] Furthermore, the thickness of the graphite felt is 10-30 mm. Furthermore, the thickness of the graphite felt is 20 mm.

[0026] Furthermore, the base body includes a base plate and a cylindrical base, the cylindrical base being mounted on the base plate, and the furnace being mounted on the cylindrical base.

[0027] Furthermore, the cylindrical base is constructed by assembling several bricks.

[0028] Furthermore, the outer wall of the furnace is provided with reinforcing ribs.

[0029] Furthermore, the furnace body is symmetrically arranged vertically, with the diameters of the upper and lower ends smaller than the diameter of the middle section. The diameter of the middle section of the furnace is 3-5m, while the diameters of the upper and lower ends are the same, both 2-3m. The top diameter of the upper part of the graphite mold is 0.5-1.5m, and the diameter of the lower part is 0.5-1m.

[0030] A method for preparing large artificial crystal mica sheets for high-speed railway infrastructure insulation components includes the following steps: S1: Install the furnace on the base body; S2: Fill the base body and furnace with filler, and fix the bottom of the graphite mold inside the filler; S3: Pour the raw materials into the furnace through the feed inlet, and heat them to 1400-1800℃ by the heating element to melt them; S4: The molten liquid enters the lower part of the graphite mold through the connecting hole and is dispersed into the lower part of the graphite mold by the dispersion body; wherein, a seed crystal is placed in the lower part of the graphite mold.

[0031] The advantages and beneficial effects of this invention are as follows: (1) The present invention sets up a graphite mold in the furnace, which is divided into upper and lower parts. The raw material in the upper part can be completely melted, while the temperature of the lower part is too low to melt. The melt at constant temperature will not grow crystal nuclei. Only when the temperature drops to about 1450 degrees will crystal nuclei begin to grow. Therefore, when the raw material in the upper part melts, its temperature is about 1750 degrees. Then it will drip into the lower part through the connecting hole on the mold and drip onto the seed crystal. Before the crystal nuclei can grow, it begins to grow around the seed crystal, so a larger sheet can be grown.

[0032] (2) Seed crystals are large sheets that are thinned from existing mirror-like sheets without creases. By controlling the growth of crystal nuclei, the more crystal nuclei formed by the melt, the smaller the sheet, and vice versa.

[0033] (3) Add raw materials through the feed port at the top of the furnace and cover the feed port with a cover. Ceramic fiber felt and graphite felt are laid on the inner wall of the furnace from the inside to the outside. Both ceramic fiber felt and graphite felt are breathable materials. At the same time, several cut slits are opened on the furnace wall to penetrate the furnace wall. Through the above settings, the gas generated by the reaction of raw materials can diffuse outward, so that the reaction can proceed towards the target product. In addition, ceramic fiber felt and graphite felt have good high temperature resistance and can play a heat preservation role. Attached Figure Description

[0034] Figure 1 This invention relates to equipment for preparing large mica sheets; Figure 2 yes Figure 1 A magnified view of part A in the image; Figure 3 This is a schematic diagram of the cross-sectional structure of the furnace.

[0035] Furnace 1, graphite felt 2, ceramic fiber felt 3, cutting slit 4, base plate 5, cylindrical base 6, reinforcing rib 7, graphite mold 8, upper body 81, lower body 82, connecting hole 83, dispersion body 84, filler 9, heating body 10. Detailed Implementation

[0036] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0037] (I) Preparation of mica sheets Example 1:

[0038] A method for preparing large artificial crystal mica sheets for high-speed railway infrastructure insulation components includes the following steps: S1: Install and fix furnace 1 on the base body; S2: Fill the cylindrical base 6 with filler 9 and fill it upward to the bottom 1 / 3 position of the furnace 1. Place the graphite mold 8 at the central axis of the furnace 1 and completely fix the lower part 82 of the graphite mold 8 in the filler 9. Install the heating element 10 at the central axis of the furnace 1. The upper end of the heating element 10 is installed on the furnace 1. The lower end of the heating element 10 extends to the upper 1 / 2 position of the graphite mold 8. S3: Pour the raw material into the furnace 1 through the feed port, and heat it to 1750°C with the heating element 10 to melt it; S4: The molten liquid enters the lower body 82 from the upper body 81 of the graphite mold 8 through the connecting hole 83 and is dispersed into the lower body 82 of the graphite mold 8 through the dispersion hole on the dispersion body 84; wherein, a seed crystal is placed in the lower body 82 of the graphite mold 8.

[0039] The raw materials, by weight, include 36 parts of quartz sand, 30 parts of fused magnesia, 20 parts of potassium fluorosilicate, 12 parts of alumina, and 2 parts of potassium carbonate. The filler material is the unmelted raw material in the furnace after it has been prepared according to this process in the early stage; The height of the graphite mold is 1 / 3 of the furnace height. The height ratio of the upper part to the lower part of the graphite mold is 5:3. The diameter of the connecting hole is 3 cm; the diameter of the dispersing hole is 1.5 cm.

[0040] The furnace body is symmetrically arranged vertically, with the diameters of the upper and lower ends smaller than the diameter of the middle section. The diameter of the middle section of the furnace is 3.5m, while the diameters of the upper and lower ends are the same, both 2.5m. The top diameter of the graphite mold is 1m, and the bottom diameter is 0.8m. The furnace height is 4.5m.

[0041] The inner wall of the furnace 1 is equipped with a high-temperature resistant component, which includes graphite felt 2 and ceramic fiber felt 3. The ceramic fiber felt 3 is attached to the inner wall of the furnace 1, and the graphite felt 2 is attached to the ceramic fiber felt 3. The furnace 1 wall is provided with a number of cutting slits 4. The cutting slits 4 are arranged horizontally, and the width of the cutting slits 4 is 2mm. The furnace 1 wall is 10mm thick, the ceramic fiber felt 3 is 50mm thick, and the graphite felt 2 is 20mm thick. The base body includes a base plate 5 and a cylindrical base 6. The cylindrical base 6 is installed on the base plate 5, and the furnace 1 is installed on the cylindrical base 6. The cylindrical base 6 is formed by a number of bricks.

[0042] Seed crystals are made from large, thinned, mirror-finish sheets without creases, measuring 40-50 cm in size. 2 .

[0043] Comparative Example 1: The only difference from Example 1 is that no high-temperature resistant components are installed inside the furnace and no cutting slits are made on the furnace wall.

[0044] Comparative Example 2: The only difference from Example 1 is that no high-temperature resistant components are installed inside the furnace.

[0045] Comparative Example 3: The only difference from Example 1 is that no cutting slits are made on the furnace wall.

[0046] Comparative Example 4: The only difference from Example 1 is that no dispersion is provided in the graphite mold.

[0047] Comparative Example 5: The only difference from Example 1 is that the upper part of the graphite mold is a cylindrical structure with the same diameter as the lower part, and the bottom of the upper part and the top of the lower part are directly connected to form a cylindrical structure with an open top. The position of the dispersed body on the lower part is the same as in Example 1.

[0048] (ii) Performance parameters

[0049] As can be seen from the examples and comparative examples, by setting a graphite mold in the furnace of Example 1, and simultaneously setting high-temperature resistant components and cutting slits, the mica sheets prepared have a size of 10-60 cm. 2The maximum size can reach 50-60cm 2 In the comparative example, without the use of high-temperature resistant components, cutting slits, or graphite molds, the mica sheets produced were relatively small in size.

[0050] This invention uses a graphite mold set inside a furnace, divided into upper and lower parts. The raw materials in the upper part can be completely melted, while the temperature in the lower part is too low to melt. Molten liquid at a constant temperature will not grow crystal nuclei. Crystal nuclei will only begin to grow when the temperature drops to around 1450 degrees Celsius. Therefore, when the raw materials in the upper part melt, their temperature is around 1750 degrees Celsius. They will then drip through the connecting holes on the mold into the lower part and onto the seed crystal. Before the crystal nuclei have a chance to grow, they begin to grow around the seed crystal, thus growing larger flakes.

[0051] This invention introduces raw materials through a feed inlet at the top of the furnace, which is then covered by a lid. Ceramic fiber felt and graphite felt are laid sequentially from the inside out on the inner wall of the furnace. Both the ceramic fiber felt and graphite felt are breathable materials. Furthermore, several through-cut slits are provided on the furnace wall. This arrangement facilitates the outward diffusion of gases generated during the raw material reaction, allowing the reaction to proceed towards the target product. In addition, the ceramic fiber felt and graphite felt possess good high-temperature resistance, thus providing insulation.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A device for preparing large-scale artificial crystal mica sheets specifically for insulating components in high-speed railway infrastructure, characterized in that, It includes a base, a furnace installed on the base, a heating element installed at the central axis of the furnace, and a graphite mold. The furnace has a feed inlet at the top. Raw materials are poured into the furnace through the feed inlet. The base body and the bottom of the furnace are filled with filler, the bottom of the graphite mold is buried in the filler, and the upper part of the graphite mold is located above the filler. The graphite mold is composed of an upper body and a lower body connected together, and the upper body and the lower body are connected by a connecting hole; The upper part has a bowl-shaped structure, and the lower part has a cylindrical structure; It also includes a dispersion body, which is provided at the top of the lower body. The dispersion body is a circular plate-shaped structure that fits into the inner wall of the lower body, and the dispersion body has several dispersion holes. The inner wall of the furnace is equipped with high-temperature resistant components, and the furnace wall has several cutting slits.

2. The equipment for preparing large artificial crystal mica sheets for high-speed railway infrastructure insulation components according to claim 1, characterized in that, The height of the graphite mold is 1 / 4 to 1 / 2 of the height of the furnace.

3. The equipment for preparing large-scale artificial crystal mica sheets for high-speed railway infrastructure insulation components according to claim 2, characterized in that, The height ratio of the upper body to the lower body of the graphite mold is 1 to 5 / 3.

4. The equipment for preparing large artificial crystal mica sheets for high-speed railway infrastructure insulation components according to claim 1, characterized in that, The raw materials, by weight, include 30-40 parts of quartz sand, 25-35 parts of fused magnesia, 10-30 parts of potassium fluorosilicate, 5-15 parts of alumina, and 1-5 parts of potassium carbonate.

5. The equipment for preparing large artificial crystal mica sheets for high-speed railway infrastructure insulation components according to claim 1, characterized in that, The filler is filled upwards to 1 / 4 to 1 / 2 of the bottom of the furnace.

6. The equipment for preparing large artificial crystal mica sheets for high-speed railway infrastructure insulation components according to claim 1, characterized in that, The high-temperature resistant component includes graphite felt and ceramic fiber felt, wherein the ceramic fiber felt is attached to the inner wall of the furnace, and the graphite felt is attached to the ceramic fiber felt.

7. A method for preparing large mica sheets using the equipment for preparing large artificial crystal mica sheets for high-speed railway infrastructure insulation components as described in any one of claims 1-6, characterized in that, It includes the following steps: S1: Install the furnace on the base body; S2: Fill the base body and furnace with filler, and fix the bottom of the graphite mold inside the filler; S3: Pour the raw materials into the furnace through the feed inlet, and heat them to 1400-1800℃ by the heating element to melt them; S4: The molten liquid enters the lower part of the graphite mold through the connecting hole and is dispersed into the lower part of the graphite mold by the dispersion body; wherein, a seed crystal is placed in the lower part of the graphite mold.

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