Preparation method of high-temperature-resistant selenium porcelain

Abstract

The invention discloses a preparation method of high-temperature-resistant selenium porcelain. The preparation method is characterized by comprising the following steps: (1) grinding selenium ore into nano-selenium powder; (2) preparing selenium-rich fibers; (3) mixing the selenium-rich fiber obtained in the step (2) with glaze to obtain a mixture, and glazing a ceramic body by adopting the mixture; (4) calcining the glazed green body in the step (3) at a high temperature, then cooling, and in the high-temperature sintering process of the selenium-rich fibers, permeating a glass phase of the glaze through micropores to form a compact structure in which the selenium-rich fibers and the glaze are tightly combined; and (5) polishing the surface of the sintered ceramic body in the step (4), so that the selenium-rich fibers are in contact with the outside, and the high-temperature-resistant selenium ceramic is obtained. When the selenium porcelain is prepared by adopting the method, the selenium porcelain is not easy to damage in a high-temperature firing process, the selenium porcelain can be smoothly prepared, and the selenium element can be smoothly released in a use process.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramics, and particularly relates to a preparation method of high-temperature resistant selenium porcelain. Background Art

[0002] In recent years, with the continuous improvement of living standards, people have higher requirements for the living environment and physical fitness, and pay more attention to physical health care and quality improvement. Selenium is an essential trace element in the human body (a mineral with a content less than 0.01% of the human body weight), and its content in the human body is very small (6 - 20 mg). However, it is an important component of some antioxidant enzymes (glutathione peroxidase) and selenium-P protein in the human body, playing a role in balancing the redox atmosphere in the body, and is closely related to human survival and health. Currently, there are various selenium supplement products on the market, and their product positions are also diverse, making consumers with selenium supplement needs at a loss. Some types of selenium are not suitable for human consumption. Therefore, understanding the classification and advantages of selenium is the key to healthy selenium supplementation.

[0003] Among current various selenium supplementation methods, in addition to selenium supplement products that can be taken directly, some ceramic ware manufacturers will add selenium-rich clay during the process of firing the porcelain body, so that the ceramic ware slowly releases selenium during use, thereby playing a role in selenium supplementation. For example, Chinese invention patent publication numbers CN116396057A and CN108083764B both point out that ceramic ware bodies are fired by adding selenium-rich soil, but the methods they adopt are to directly crush the selenium soil and mix it into the glaze and then coat it on the green body. However, due to the instability of selenium at high temperatures, if substances containing selenium are doped into the ceramic ware body and directly fired, they are easily damaged during the firing process and cannot achieve the effect of supplementing selenium. To achieve a better selenium supplementation effect, some researchers have adopted the technical route of low-temperature firing of pottery or glaze to achieve a better selenium release effect; however, the service performance of low-temperature fired pottery or glaze is poor and cannot meet people's application requirements.

[0004] Patent CN116835748A uses selenium ore powder as the main raw material and is fired at 1300 °C to prepare selenium-rich ceramic particles for application in the water purification field. The main components of selenium ore are shown in the following table:

[0005] The applicant conducted a calcination test on selenium ore powder to obtain the amount of selenium released. The test results are shown in the following table: (Test conditions: Take 3 grams of powder, put it into a 100 ml beaker, soak it in tap water for 1 hour, and measure the content of selenium ions in the water) Calcination temperature Selenium release amount / mg / L Room temperature 0.1906 800℃ 0.2347 1300℃ 0.1832 Through the above result analysis, selenium ore powder has excellent high-temperature resistance performance and still has a relatively high selenium release amount after being calcined at 1300°C. After being calcined at 800°C, the selenium release amount has increased. The main reason is that after being calcined at 800°C, the organic matter inside the selenium ore powder can be burned off, forming pores, which is conducive to the release of selenium elements.

[0006] The applicant further uses selenium ore as the raw material, grinds it into powder, mixes it with ceramic raw materials according to a mass fraction of 1:1, coats the inner wall of a ceramic cup, and the firing temperature is 1300°C to make a finished cup. After soaking it in water, the selenium release amount is 1.54 micrograms per liter. This cup has a good selenium release effect, but the coating has not become porcelain, the firing is not dense, and it still belongs to a ceramic product.

[0007] After the applicant mixes selenium ore powder and ceramic glaze in a ratio of 1:1 and coats the inner wall of a ceramic cup to make a finished cup, and soaks it in water, the selenium release amount is 0.023 micrograms per liter. The selenium release amount is very small. The main reason is that the glass phase wraps the selenium ore powder, hindering its contact with water and resulting in a decrease in the selenium release amount.

[0008] Therefore, the cup made of selenium ore powder as the raw material has a selenium element release effect, but the problem of still ensuring the selenium release amount under the condition of becoming porcelain needs to be solved. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a preparation method of high-temperature resistant selenium porcelain. When preparing selenium porcelain by using this method, selenium ore with relatively high thermal stability performance is used as the raw material, which is not easily damaged during the high-temperature firing process to cause selenium element loss, and selenium porcelain can be successfully prepared, and the selenium element can be smoothly released during use.

[0010] In order to solve the above technical problems, the following technical solutions are adopted: A preparation method of high-temperature resistant selenium porcelain, characterized by including the following steps: (1) Grind selenium ore into nano-selenium powder; (2) Prepare selenium-rich fiber: (2-1) Add the nano-selenium powder obtained in step (1) to an appropriate amount of ethylene glycol to disperse it into a powder dispersion liquid; (2-2) Polymerize the powder dispersion liquid obtained in step (2-1) with PET (polyethylene terephthalate) polyester melted into a gel-like substance, and then extrude and cut it to make granular functional masterbatch; (2-3) Polymerize the functional masterbatch obtained in step (2-2) with PET polyester again, and then spin it to make selenium-rich fiber with a large number of micropores, and spray ceramic special high-temperature resistant antibacterial powder on the selenium-rich fiber; (3) Mix the selenium-rich fibers obtained in step (2) with the glaze to obtain a mixture, and glaze the ceramic blank with the mixture. (4) Subject the glazed blank obtained in step (3) to high-temperature calcination and then cooling. During the high-temperature sintering process of the selenium-rich fibers, organic substances such as PET volatilize through calcination, and the glass phase of the glaze penetrates through the micropores to form a dense structure in which the selenium-rich fibers and the glaze are tightly combined. (5) Polish the surface of the ceramic blank that has completed sintering in step (4) to make the selenium-rich fibers contact the outside world, and obtain the high-temperature-resistant selenium porcelain.

[0011] In the preferred embodiment, grinding the selenium ore into nano-selenium powder in step (1) includes the following steps: Weigh the selenium ore and high-purity water according to a mass ratio of 1:1 - 1:1.2, add a dispersant and then disperse evenly with a sand mill to form a slurry, and then remove the moisture from the slurry to obtain nano-selenium powder.

[0012] In a further preferred embodiment, the slurry is dehydrated by centrifugation and spray drying. Among them, the inlet temperature of spray drying is 240 °C, and the outlet temperature is 110 °C.

[0013] In a further preferred embodiment, the dispersant is sodium tripolyphosphate, and the addition amount of the dispersant is 0.25 - 0.5% of the weight of the selenium ore.

[0014] In a further preferred embodiment, the rotation speed of the sand mill is 1900 - 2000 rpm, and the sanding time is 80 - 100 min.

[0015] In the preferred embodiment, the particle size distribution of the nano-selenium powder obtained in step (1) is 200 - 500 nm.

[0016] In the preferred embodiment, the mass of ethylene glycol added in step (2-1) is 16 - 30% of the mass of the nano-selenium powder.

[0017] In the preferred embodiment, in steps (2-2) and (2-3), the polymerization method is both direct esterification method, and the polymerization temperature is 275 - 300 °C.

[0018] In the preferred embodiment, in step (2-2), the powder dispersion liquid is polymerized with the PET polyester melted into a jelly-like substance. Among them, the mass of the nano-selenium powder accounts for 30 - 35% of the total amount.

[0019] In the preferred embodiment, after polymerizing the powder dispersion liquid with the PET polyester melted into a jelly-like substance in step (2-2), it is extruded into strips by a screw extruder, then stretched and cooled, and then cut into granular form to make the granular functional masterbatch.

[0020] In a preferred embodiment, in step (2-3), the functional masterbatch is polymerized with PET polyester, wherein the mass ratio of the functional masterbatch to PET polyester is 1:2.

[0021] In a preferred embodiment, in step (2-3), the selenium-rich fibers are formed by spinning through a polyester spinning process using a spinneret.

[0022] In a further preferred embodiment, the spinneret is a circular spinneret, and the resulting selenium-rich fibers have a circular cross-section; and the diameter of the selenium-rich fibers is 3-5 μm, and the fiber length is 30-50 μm.

[0023] In a preferred embodiment, in step (2-3), a ceramic special high-temperature resistant antibacterial powder with a mass fraction of 1-2% is sprayed onto the selenium-rich fibers.

[0024] In a preferred embodiment, in the mixture obtained by mixing the selenium-rich fibers and the glaze in step (3), the selenium-rich fibers and the glaze are mixed in a mass ratio of 1:10 - 1:15.

[0025] In a preferred embodiment, after glazing the ceramic green body in step (4), the glazed green body is placed at 25-35 °C for drying for 30-40 h, then placed in a drying oven at 100 °C for 60 min, then heated to 600 °C at a heating rate of 1 °C / min, then heated to 900 °C at a heating rate of 5 °C / min, then heated to 1250 °C at a heating rate of 3 °C / min, and then calcined at high temperature for 30 min.

[0026] In a preferred embodiment, in step (5), a vibrating polishing machine with a power of 3 KW and a motor speed of 1450 r / min is used to polish the surface of the ceramic green body.

[0027] Compared with the prior art, the present invention has the following beneficial effects: (1) The selenium-rich fibers of the present invention have a microporous structure. During the high-temperature sintering process, the glass phase penetrates through the pores to form a dense structure, enhancing the bonding characteristics between the fibers and the glaze; (2) The nano-selenium ore powder of the present invention has excellent high-temperature resistance. After being calcined at 1300 °C, it still has a high selenium release amount. The selenium-rich fibers made from the selenium ore powder can be directly in contact with the outside world to form a selenium release channel, so that selenium in the glaze can be continuously released to the outside during use; (3) The selenium porcelain prepared by the present invention has a dense and smooth surface, and its performance is far superior to that of selenium ceramic products, and it has excellent antibacterial properties; (4) Through the preparation method of the high-temperature resistant selenium porcelain of the present invention, a selenium porcelain cup is prepared. After firing into a finished cup and soaking it in water, the selenium release amount is 1-2 μg / L. Detailed Embodiments

[0028] Example 1. In this example, the preparation method of the high-temperature resistant selenium porcelain includes the following steps: (1) Preparation of nano-selenium powder: Weigh 100.0 g of selenium ore and 100.0 g of high-purity water. After adding 0.3 g of sodium tripolyphosphate dispersant, disperse them evenly with a sand mill to form a slurry. Among them, the rotation speed of the sand mill is 1900 rpm, and the sanding time is 100 min; use centrifugation and spray drying to remove the moisture from the slurry to obtain nano-selenium powder with a particle size distribution of 220 - 320 nm. Among them, the inlet temperature of spray drying is 240 °C, and the outlet temperature is 110 °C; (2) Preparation of selenium-rich fibers: (2-1) Add the nano-selenium powder obtained in step (1) to ethylene glycol to disperse it into a powder dispersion liquid. The mass of ethylene glycol is 18% of the mass of the nano-selenium powder; (2-2) Polymerize the powder dispersion liquid obtained in step (2-1) and PET polyester melted into a gel-like substance by the direct esterification method. The polymerization temperature is 280 °C, and the mass of the nano-selenium powder accounts for 35% of the total amount; then extrude it into strips through a screw extruder, then stretch and cool it, and then cut it into granular form to make granular functional masterbatch; (2-3) Polymerize the functional masterbatch obtained in step (2-2) and PET polyester again by the direct esterification method. The polymerization temperature is 280 °C, and the mass ratio of the functional masterbatch to PET polyester is 1:2; then through the polyester spinning process, spin it through a spinneret to make selenium-rich fibers with a large number of micropores. Among them, the spinneret is a circular spinneret, the obtained selenium-rich fibers have a circular cross-section, and the diameter of the selenium-rich fibers is 3 μm, and the fiber length is 30 μm; then spray a ceramic special high-temperature resistant antibacterial powder with a mass fraction of about 1% on the selenium-rich fibers; (3) Mix the selenium-rich fibers obtained in step (2) with the glaze to obtain a mixture. Among them, the selenium-rich fibers and the glaze are mixed according to a mass ratio of 1:15, and use the mixture to glaze the ceramic blank; (4) Place the glazed blank in step (3) at 25 - 35 °C for drying for 30 - 40 h, then place it in a drying oven at 100 °C for 60 min, then raise the temperature to 600 °C at a heating rate of 1 °C / min, then raise the temperature to 900 °C at a heating rate of 5 °C / min, then raise the temperature to 1250 °C at a heating rate of 3 °C / min, and then perform high-temperature calcination for 30 min; after high-temperature calcination, take it out of the kiln and cool it. During the high-temperature sintering process of the selenium-rich fibers, the glass phase of the glaze penetrates through the micropores to form a dense structure in which the selenium-rich fibers and the glaze are tightly combined, enhancing the bonding characteristics between the fibers and the glaze; (5) Polish the surface of the sintered ceramic body in step (4) with a vibratory polisher with a power of 3 KW and a motor speed of 1450 r / min to make the selenium-rich fibers contact the outside world, and obtain high-temperature resistant selenium porcelain.

[0029] For the high-temperature resistant selenium porcelain prepared by the preparation method of this embodiment, during use, the selenium-rich fibers form channels to release selenium elements, and the contained water contacts the selenium elements. After testing, for the high-temperature resistant selenium porcelain prepared in this embodiment, the selenium release amount is 1.2 μg / L.

[0030] Example 2, in this example, the preparation method of high-temperature resistant selenium porcelain includes the following steps: (1) Prepare nano-selenium powder: Weigh 100.0 g of selenium ore and 120.0 g of high-purity water, add 0.4 g of sodium tripolyphosphate dispersant, and disperse evenly with a sand mill to form a slurry. Among them, the rotation speed of the sand mill is 2000 rpm, and the sand milling time is 80 min; use centrifugation and spray drying to remove the moisture from the slurry, and prepare nano-selenium powder with a particle size distribution of 400 - 450 nm. Among them, the inlet temperature of spray drying is 240 °C, and the outlet temperature is 110 °C; (2) Prepare selenium-rich fibers: (2-1) Add the nano-selenium powder obtained in step (1) to ethylene glycol to disperse it into a powder dispersion liquid, and the mass of ethylene glycol is 24% of the mass of the nano-selenium powder; (2-2) Polymerize the powder dispersion liquid obtained in step (2-1) with PET polyester melted into a gel-like substance by the direct esterification method, and the polymerization temperature is 280 °C, where the mass of the nano-selenium powder accounts for 31% of the total amount; then extrude it into strips through a screw extruder, then perform stretching and cooling, and then cut it into granular form to make granular functional masterbatch; (2-3) Polymerize the functional masterbatch obtained in step (2-2) with PET polyester again by the direct esterification method, and the polymerization temperature is 280 °C, where the mass ratio of the functional masterbatch to PET polyester is 1:2; then through the polyester spinning process, spin it through a spinneret to make selenium-rich fibers with a large number of micropores. Among them, the spinneret is a circular spinneret, the obtained selenium-rich fibers have a circular cross-section, and the diameter of the selenium-rich fibers is 4 μm, and the fiber length is 40 μm; then spray a ceramic special high-temperature resistant antibacterial powder with a mass fraction of about 2% on the selenium-rich fibers; (3) Mix the selenium-rich fibers obtained in step (2) with glaze to obtain a mixture. Among them, the selenium-rich fibers and glaze are mixed in a mass ratio of 1:10, and use the mixture to glaze the ceramic body; (4) Place the glazed green body in step (3) at 35 °C for drying for 30 h, then place it in a drying oven at 100 °C for 60 min, then raise the temperature to 600 °C at a heating rate of 1 °C / min, then raise the temperature to 900 °C at a heating rate of 5 °C / min, then raise the temperature to 1250 °C at a heating rate of 3 °C / min, and then perform high-temperature calcination for 30 min; after high-temperature calcination, take it out of the kiln for cooling. During the high-temperature sintering process of the selenium-rich fiber, the glass phase of the glaze penetrates through the micropores to form a dense structure in which the selenium-rich fiber and the glaze are tightly combined, enhancing the bonding characteristics between the fiber and the glaze; (5) Polish the surface of the ceramic green body that has completed sintering in step (4) with a vibrating polisher with a power of 3 KW and a motor speed of 1450 r / min, so that the selenium-rich fiber contacts the outside world to obtain high-temperature resistant selenium porcelain.

[0031] For the high-temperature resistant selenium porcelain prepared by the preparation method of this example, during use, the selenium-rich fiber forms channels to release selenium elements, and the contained water contacts the selenium elements. After testing, for the high-temperature resistant selenium porcelain prepared in this example, the selenium release amount is 1.6 μg / L.

[0032] Example 3. In this example, the preparation method of the high-temperature resistant selenium porcelain includes the following steps: (1) Prepare nano-selenium powder: Weigh 100.0 g of selenium ore and 110.0 g of high-purity water, add 0.5 g of sodium tripolyphosphate dispersant, and disperse evenly with a sand mill to form a slurry. Among them, the rotation speed of the sand mill is 2000 rpm, and the sand milling time is 90 min; use centrifugation and spray drying to remove the moisture from the slurry to obtain nano-selenium powder with a particle size distribution of 350 - 400 nm. Among them, the inlet temperature of spray drying is 240 °C, and the outlet temperature is 110 °C; (2) Prepare selenium-rich fiber: (2-1) Add the nano-selenium powder obtained in step (1) to ethylene glycol to disperse it into a powder dispersion liquid, and the mass of ethylene glycol is 28% of the mass of the nano-selenium powder; (2-2) Polymerize the powder dispersion liquid obtained in step (2-1) with PET polyester melted into a gel-like substance by the direct esterification method. The polymerization temperature is 285 °C, and the mass of the nano-selenium powder accounts for 33% of the total amount; then extrude it into strips through a screw extruder, then perform stretching and cooling, and then cut it into granular shape to make granular functional masterbatch; (2-3) Polymerize the functional masterbatch obtained in step (2-2) with PET polyester by direct esterification method at a polymerization temperature of 285 °C. Among them, the mass ratio of the functional masterbatch to PET polyester is 1:2. Then, through the polyester spinning process, spin the fiber through a spinneret to make selenium-rich fibers with a large number of micropores. Among them, the spinneret is a circular spinneret, and the obtained selenium-rich fibers have a circular cross-section, and the diameter of the selenium-rich fibers is 5 μm, and the fiber length is 50 μm. Then spray a ceramic special high-temperature resistant antibacterial powder with a mass fraction of about 1% on the selenium-rich fibers; (3) Mix the selenium-rich fibers obtained in step (2) with the glaze to obtain a mixture. Among them, the selenium-rich fibers and the glaze are mixed in a mass ratio of 1:12, and the mixture is used to glaze the ceramic blank; (4) Place the glazed blank in step (3) in a drying oven at 25 °C for 40 h, then place it in a drying oven at 100 °C for 60 min, then raise the temperature to 600 °C at a heating rate of 1 °C / min, then raise the temperature to 900 °C at a heating rate of 5 °C / min, then raise the temperature to 1250 °C at a heating rate of 3 °C / min, and then perform high-temperature calcination for 30 min; After high-temperature calcination, take it out of the kiln and cool it. During the high-temperature sintering process of the selenium-rich fibers, the glass phase of the glaze penetrates through the micropores to form a dense structure in which the selenium-rich fibers and the glaze are tightly combined, enhancing the bonding characteristics between the fibers and the glaze; (5) Polish the surface of the ceramic blank completed in step (4) with a vibrating polisher with a power of 3 KW and a motor speed of 1450 r / min to make the selenium-rich fibers contact the outside world, and obtain high-temperature resistant selenium porcelain.

[0033] For the high-temperature resistant selenium porcelain prepared by the preparation method of this embodiment, during use, the selenium-rich fibers form channels to release selenium elements, and the water contained contacts the selenium elements. After testing, for the high-temperature resistant selenium porcelain prepared in this embodiment, the selenium release amount is 1.8 μg / L.

Claims

1. A method for preparing high temperature resistant selenium porcelain, characterized in that The following steps are involved: (1) Grinding selenium ore into nano-selenium powder; (2) Preparation of selenium-rich fiber: (2-1) Adding an appropriate amount of ethylene glycol to the nano-selenium powder obtained in step (1) to disperse into a powder dispersion; (2-2) polymerizing the powder dispersion obtained in step (2-1) with the PET polyester that has been hot-melted into a gel-like substance, and then extruding and cutting to prepare a granular functional masterbatch; (2-3) polymerizing the functional masterbatch obtained in step (2-2) with PET polyester, spinning it to produce selenium-rich fibers with a large number of micropores, and spraying ceramic-specific high-temperature resistant antibacterial powder onto the selenium-rich fibers; (3) mixing the selenium-rich fiber obtained in step (2) with a glaze to obtain a mixture, and using the mixture to glaze a ceramic body; (4) The green body after glazing in step (3) is calcined at high temperature and then cooled. During the high-temperature sintering process of the selenium-rich fiber, organic matter such as PET is volatilized after calcination, while the glass phase of the glaze penetrates through the micropores, forming a dense structure in which the selenium-rich fiber and the glaze are tightly combined; (5) Polishing the surface of the ceramic body sintered in step (4) to allow the selenium-rich fibers to contact the outside world, thereby obtaining high-temperature resistant selenium ceramics.

2. The method for preparing a high temperature resistant selenium porcelain according to claim 1, characterized in that: The step (1) of grinding the selenium ore into nano-selenium powder comprises the following steps: weighing the selenium ore and high-purity water in a mass ratio of 1:1-1:1.2, adding 0.25-0.5% of sodium tripolyphosphate as a dispersant based on the weight of the selenium ore, and dispersing the mixture evenly with a sand mill to form a slurry, wherein the speed of the sand mill is 1900-2000 rpm and the sand milling time is 80-100 min; and then removing the moisture from the slurry by centrifugation and spray drying to obtain nano-selenium powder, wherein the inlet temperature of the spray drying is 240°C and the outlet temperature is 110°C.

3. The method for preparing a high temperature resistant selenium porcelain according to claim 1, characterized in that: The particle size distribution of the nano-selenium powder obtained in step (1) is 200-500 nm.

4. The method for preparing a high temperature resistant selenium porcelain according to claim 1, characterized in that: The mass of ethylene glycol added in the step (2-1) is 16-30% of the mass of the nano-selenium powder.

5. The method for preparing a high temperature resistant selenium porcelain according to claim 1, characterized in that: In the step (2-2), the powder dispersion and the PET polyester that has been hot-melted into a gel are polymerized, wherein the polymerization method adopts a direct esterification method, the polymerization temperature is 275-300°C, and the mass of the nano-selenium powder accounts for 30-35% of the total amount; after the powder dispersion and the PET polyester that has been hot-melted into a gel are polymerized, they are extruded into strips through a screw extruder, then stretched and cooled, and then cut into granules to prepare the granular functional masterbatch.

6. The method for preparing a high temperature resistant selenium porcelain according to claim 1, characterized in that: In the step (2-3), the method for polymerizing the functional masterbatch with PET polyester adopts a direct esterification method, and the polymerization temperature is 275-300°C, wherein the mass ratio of the functional masterbatch to the PET polyester is 1:2; the method of spinning to form the selenium-rich fiber is through a polyester spinning process, and the spinning is performed by a spinneret; the spinneret is a circular spinneret, and the obtained selenium-rich fiber has a circular cross-section; and the diameter of the selenium-rich fiber is 3-5 μm, and the fiber length is 30-50 μm.

7. The method for preparing a high temperature resistant selenium porcelain according to claim 1, characterized in that: In the step (2-3), 1-2% by mass of high temperature resistant antibacterial powder specially used for ceramics is sprayed onto the selenium-rich fiber.

8. The method for preparing a high temperature resistant selenium porcelain according to claim 1, characterized in that: In the mixture obtained by mixing the selenium-rich fiber and the glaze in step (3), the selenium-rich fiber and the glaze are mixed in a mass ratio of 1:10-1:

15.

9. The method for preparing a high temperature resistant selenium porcelain according to claim 1, characterized in that: After glazing the ceramic body in step (4), the glazed body is placed at 25-35°C for drying for 30-40 h, then placed in a drying oven at 100°C for 60 min, then heated to 600°C at a heating rate of 1°C / min, then heated to 900°C at a heating rate of 5°C / min, then heated to 1250°C at a heating rate of 3°C / min, and then calcined at high temperature for 30 min.

10. The method for preparing high temperature resistant selenium porcelain according to claim 1, characterized in that: In the step (5), a vibration polishing machine with a power of 3 KW and a motor speed of 1450 r / min is used to polish the surface of the ceramic body.

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