Preparation method of three-dimensional phase separation glaze for coal gangue ceramic body decoration

Abstract

The application discloses a preparation method of a three-dimensional phase-separated decorative glaze for coal gangue ceramic bodies, which comprises a base glaze and a surface glaze, and the surface glaze is prepared from the following raw materials in a percentage by weight: 15-20% of quartz, 10-15% of calcite, 5-10% of kaolin, 5-10% of zinc oxide, 10-15% of calcium phosphate, 25-30% of potassium feldspar, 2-5% of calcium borate, 5-10% of tin dioxide, 3-5% of spodumene and 2-5% of coloring oxide; and the base glaze is prepared from the following raw materials in a percentage by weight: 15-20% of quartz, 10-15% of wollastonite, 5-10% of kaolin, 10-15% of zinc oxide, 15-20% of calcium phosphate, 15-20% of spodumene, 5-10% of titanium dioxide, 5-10% of calcium borate, 2-5% of coal gangue and 2-5% of coloring oxide; and the product is obtained through raw material preparation, glazing and sintering. The three-dimensional phase-separated decorative glaze has a simple process, strong adaptability, unique effect and wide market prospect.

Description

Technical Field

[0001] This invention belongs to the field of ceramic glazes, specifically relating to a method for preparing a three-dimensional phase-separated glaze for decorating coal gangue ceramic bodies. Background Technology

[0002] With the continuous development of the social economy, the public's demand for daily necessities has evolved from basic practical functions to a high-quality experience that combines aesthetic value and artistic connotation. As important household utensils and art pieces, the decorative effect of ceramic products directly determines their artistic expression and market value. Among them, floral glazes, with their unique artistic charm of natural kiln transformation, vibrant colors, and unpredictable textures, have become an important branch of high-end art porcelain decoration. Floral glaze technology typically involves carefully designing glaze formulas (using quartz, feldspar, kaolin, etc. as main raw materials), introducing various metal oxides as colorants, and combining different glazing processes and firing regimes. Utilizing subtle changes in kiln temperature and atmosphere, complex physicochemical reactions such as liquid-phase separation, crystallization, and oxidation-reduction occur in the components of the glaze melt, ultimately forming a unique decorative effect on the glaze surface resembling flowing clouds and a dazzling starry sky, greatly satisfying people's pursuit of personalized and artistic products. Using coal gangue as a main raw material in ceramic body production is one of the effective ways to achieve large-scale, high-value-added resource utilization. However, the composition of coal gangue fluctuates greatly and often contains high levels of coloring oxides such as iron and titanium, resulting in a dark color (often grayish-black or brownish-red) and uneven texture in the sintered body, severely limiting its application in high-quality ceramic products. To use it in the production of ceramics with high whiteness and high surface quality, it is usually necessary to perform deep whitening treatment on the body or apply a thick layer of milky white glaze for covering. This not only increases production costs and process complexity but also fails to fundamentally reflect the material characteristics of coal gangue.

[0003] Currently, although there have been attempts to use coal gangue in ceramic production, these are mostly concentrated in areas with lower aesthetic requirements, such as floor tiles and refractory materials. In the field of art ceramics, developing a glaze that effectively covers the dark color of coal gangue blanks while turning this disadvantage into an advantage, giving it a unique and dazzling decorative effect, has become crucial for promoting the high-value utilization of coal gangue. Therefore, there is an urgent need to research a new type of glaze that not only possesses strong covering power to adapt to coal gangue blanks but also ensures good adhesion between the blank and the glaze, and can produce rich, varied, and endlessly changing kiln-transformation artistic effects. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a three-dimensional phase-separated glaze for decorating coal gangue ceramic blanks that is simple in process, highly adaptable, and has unique effects.

[0005] This invention is achieved through the following technical solution:

[0006] A method for preparing a three-dimensional phase-separated glaze for decorating coal gangue ceramic bodies, comprising a base glaze and a top glaze.

[0007] The weight percentage composition of the glaze raw material is as follows: quartz 15-20%, calcite 10-15%, kaolin 5-10%, zinc oxide 5-10%, calcium phosphate 10-15%, potassium feldspar 25-30%, calcium borate 2-5%, tin dioxide 5-10%, spodumene 3-5%, and coloring oxide 2-5%;

[0008] The base glaze raw material has the following weight percentage composition: quartz 15-20%, wollastonite 10-15%, kaolin 5-10%, zinc oxide 10-15%, calcium phosphate 15-20%, spodumene 15-20%, titanium dioxide 5-10%, calcium borate 5-10%, coal gangue 2-5%, and coloring oxide 2-5%.

[0009] The preparation method comprises the following steps:

[0010] Step 1: After preparing the surface glaze according to the formula, the mixture is ball-milled and sieved to obtain a glaze slurry with a specific gravity of 1.5–1.8 g / cm³. 3 ;

[0011] Step Two: Mix 10% quartz, 10-15% wollastonite, 15-20% spodumene, and 5-10% calcium borate from the base glaze formula until homogeneous. After melting, water quenching, ball milling, sieving, and drying, obtain a transparent frit. Mix the transparent frit with the other raw materials from the base glaze formula until homogeneous, then ball mill and sieve to obtain a glaze slurry with a specific gravity of 1.1-1.3 g / cm³. 3 ;

[0012] Step 3: Apply the base glaze obtained in Step 2 to the surface of the bisque-fired ceramic body. After drying, spray the top glaze obtained in Step 1 onto the surface of the base glaze.

[0013] Step 4: Place the glazed ceramic body into the kiln and fire it in an oxidizing atmosphere. Heat it to 1250-1280℃ at a rate of 1.5-2.5℃ / min, then hold it for 5-10 minutes, then rapidly cool it to 1050-1000℃, then hold it for 30-90 minutes, then slowly cool it to 800℃ at a rate of 2.5℃ / min, and then cool it down with the furnace to obtain the finished product.

[0014] The coloring oxides in the base glaze and top glaze formulations are one or a combination of two of Co2O3, CuO, and Cr2O3 in equal weight proportions.

[0015] The ball milling process for the surface glaze in step one takes 6 to 8 hours, the sieve mesh size is 100 mesh, and the residue is 0.5%.

[0016] In step three, the thickness of the top glaze on the base glaze surface is 1.5–1.8 mm, and the thickness of the base glaze on the ceramic body surface is 0.8–1.2 mm.

[0017] In step two, the melting temperature of the transparent frit is 1250℃, the holding time at the melting temperature is 15-30 minutes, the sieve mesh size is 200 mesh, and the sieve residue is 0.5%.

[0018] In step two, the base glaze is sieved through a 150-mesh screen, with a residue of 0.5%.

[0019] The weight percentage composition of the ceramic body raw materials in step three is as follows: coal gangue 35-40%, kaolin 15-20%, potassium feldspar 15-20%, calcite 5-10%, and wollastonite 15-20%.

[0020] The "quartz 10%" in step two is a part of the quartz 15-20% raw material in the base glaze formula. The "other raw material components" in "mix the transparent frit with the other raw material components of the base glaze formula evenly" include the remaining part of the quartz 15-20%.

[0021] To effectively cover the color of coal gangue blanks and achieve a stunning three-dimensional decorative effect, this invention employs a double-layer phase-separated glaze structure. The lower phase-separated glaze (base glaze) is enriched with fine needle-like crystals of titanium sphene to cover the color of the coal gangue blanks; the upper phase-separated glaze (top glaze) is enriched with large-sized crystals formed by tin dioxide. The different sizes of crystals create a three-dimensional decorative effect.

[0022] To achieve the above-mentioned technical effects, the lower phase-separated glaze (base glaze) of this invention, by adding calcium borate and zinc oxide, can significantly reduce the melting temperature and viscosity of the glaze. On the one hand, this can effectively promote the melting of high-density titanium dioxide (density 3.75~4.25g / cm³). 3 As a nucleating agent, it is enriched at the bottom of the glaze layer, and on the other hand, it can improve the gloss of the glaze surface; by adding spodumene, the coefficient of thermal expansion of the glaze can be reduced, making it compatible with the coal gangue body; by adding calcium phosphate, the liquid phase separation of the glaze can be effectively promoted, and the aggregation of titanium dioxide nucleating agents can be promoted.

[0023] The upper phase-separated glaze (surface glaze) of this invention, by adding calcium borate and zinc oxide, can significantly reduce the melting temperature and viscosity of the glaze. On the one hand, it can effectively promote the melting of high-density tin dioxide (density 6.3-6.9 g / cm³). 3 On the one hand, it can be enriched to the bottom of the glaze layer, and on the other hand, it can improve the gloss of the glaze surface; by adding spodumene, the coefficient of thermal expansion of the glaze can be reduced, so that it can match the phase separation glaze of the lower layer; by adding calcium phosphate, the liquid phase separation of the glaze can be effectively promoted, and the aggregation of tin dioxide crystals can be promoted.

[0024] The firing process of this invention includes a rapid heating stage, a high-temperature holding stage, a rapid cooling stage, a low-temperature holding stage, a slow cooling stage, and a natural cooling stage. Rapid heating promotes the melting and dispersion of the low-expansion-coefficient transparent floc, significantly reducing the thermal expansion coefficient of the underlying phase-separated glaze (base glaze). High-temperature holding promotes the melting of the glaze, adjusts the overall viscosity of the glaze, and promotes the enrichment of titanium dioxide nucleating agents and tin dioxide crystals. Rapid cooling promotes the formation of titanium sphene crystal nuclei. Low-temperature holding promotes the growth of titanium sphene crystals and tin dioxide crystals. Slow cooling improves the smoothness and gloss of the glaze surface.

[0025] This invention's three-dimensional glaze, through optimized formula composition and process parameters, can form various crystals of different sizes on the surface of ceramic blanks made primarily of coal gangue, resulting in a significant three-dimensional decorative effect. Different coloring oxides can be added as needed to adjust the color of the crystals. Furthermore, the technical solution of this invention is not only applicable to artistic ceramics but can also be extended to the field of architectural ceramics, providing core technology for the high-value utilization and product upgrading of coal gangue, thus possessing broad market prospects. Attached Figure Description

[0026] Figure 1 A photograph of the actual product obtained in Example 1;

[0027] Figure 2 A photograph of the actual product obtained in Example 2;

[0028] Figure 3 A photograph of the actual product obtained in Example 3;

[0029] Figure 4 This is a photograph of the actual product obtained in Example 4. Detailed Implementation

[0030] To further illustrate the technical means and effects adopted by the present invention in order to achieve the intended purpose, the present invention will be described in detail below with reference to preferred embodiments. Example 1

[0031] A method for preparing a three-dimensional phase-separated glaze for decorating coal gangue ceramic bodies, comprising a base glaze and a top glaze.

[0032] The weight percentage composition of the surface glaze raw material is as follows: quartz 15%, calcite 13%, kaolin 10%, zinc oxide 10%, calcium phosphate 15%, potassium feldspar 25%, calcium borate 2%, tin dioxide 5%, spodumene 3%, and coloring oxide 2%;

[0033] The base glaze raw material has the following weight percentage composition: quartz 20%, wollastonite 10%, kaolin 8%, zinc oxide 10%, calcium phosphate 20%, spodumene 15%, titanium dioxide 5%, calcium borate 5%, coal gangue 5%, and coloring oxide 2%;

[0034] The preparation method comprises the following steps:

[0035] Step 1: After preparing the surface glaze according to the formula, the mixture is ball-milled and sieved to obtain a glaze slurry with a specific gravity of 1.5 g / cm³. 3 ;

[0036] Step Two: Mix 10% quartz, 10% wollastonite, 15% spodumene, and 5% calcium borate from the base glaze formula until homogeneous. After melting, water quenching, ball milling, sieving, and drying, obtain a transparent frit. Mix the transparent frit with the other raw materials from the base glaze formula until homogeneous. After ball milling and sieving, obtain a glaze slurry with a specific gravity of 1.1 g / cm³. 3 ;

[0037] Step 3: Apply the base glaze obtained in Step 2 to the surface of the bisque-fired ceramic body. After drying, spray the top glaze obtained in Step 1 onto the surface of the base glaze.

[0038] Step 4: Place the glazed ceramic body into the kiln and fire it in an oxidizing atmosphere. Heat it to 1250℃ at a rate of 1.5℃ / min, then hold it for 5 minutes, then rapidly cool it to 1000℃, then hold it for 30 minutes, then slowly cool it to 800℃ at a rate of 2.5℃ / min, and then cool it down with the kiln to obtain the product.

[0039] The coloring oxide in the base glaze and top glaze formulations is Co2O3.

[0040] The ball milling process for the surface glaze in step one takes 6 hours, the sieve mesh size is 100 mesh, and the residue is 0.5%.

[0041] In step three, the thickness of the top glaze on the base glaze surface is 1.5 mm, and the thickness of the base glaze on the ceramic body surface is 0.8 mm.

[0042] In step two, the melting temperature of the transparent frit is 1250℃, the holding time at the melting temperature is 15 minutes, the sieve mesh size is 200 mesh, and the sieve residue is 0.5%.

[0043] In step two, the base glaze is sieved through a 150-mesh screen, with a residue of 0.5%.

[0044] The weight percentage composition of the ceramic body raw materials in step three is as follows: coal gangue 39%, kaolin 19%, potassium feldspar 17%, calcite 10%, and wollastonite 15%. Example 2

[0045] A method for preparing a three-dimensional phase-separated glaze for decorating coal gangue ceramic bodies, comprising a base glaze and a top glaze.

[0046] The weight percentage composition of the glaze raw material is as follows: quartz 20%, calcite 10%, kaolin 10%, zinc oxide 5%, calcium phosphate 12%, potassium feldspar 25%, calcium borate 5%, tin dioxide 5%, spodumene 3%, and coloring oxide 5%.

[0047] The base glaze raw material has the following weight percentage composition: quartz 19%, wollastonite 10%, kaolin 5%, zinc oxide 15%, calcium phosphate 15%, spodumene 20%, titanium dioxide 6%, calcium borate 5%, coal gangue 2%, and coloring oxide 3%;

[0048] The preparation method comprises the following steps:

[0049] Step 1: After preparing the surface glaze according to the formula, the mixture is ball-milled and sieved to obtain a glaze slurry with a specific gravity of 1.6 g / cm³. 3 ;

[0050] Step Two: Mix 10% quartz, 15% wollastonite, 18% spodumene, and 10% calcium borate from the base glaze formula until homogeneous. After melting, water quenching, ball milling, sieving, and drying, obtain a transparent frit. Mix the transparent frit with the other raw materials from the base glaze formula until homogeneous. After ball milling and sieving, obtain a glaze slurry with a specific gravity of 1.2 g / cm³. 3 ;

[0051] Step 3: Apply the base glaze obtained in Step 2 to the surface of the bisque-fired ceramic body. After drying, spray the top glaze obtained in Step 1 onto the surface of the base glaze.

[0052] Step 4: Place the glazed ceramic body into the kiln and fire it in an oxidizing atmosphere. Heat it to 1260℃ at a rate of 1.6℃ / min, then hold it for 6 minutes, then rapidly cool it to 1010℃, then hold it for 50 minutes, then slowly cool it to 800℃ at a rate of 2.5℃ / min, and then cool it down with the kiln to obtain the product.

[0053] The coloring oxide in the base glaze and top glaze formulations is CuO.

[0054] The ball milling process for the surface glaze in step one takes 7 hours, the sieve mesh size is 100 mesh, and the residue is 0.5%.

[0055] In step three, the thickness of the top glaze on the base glaze surface is 1.6 mm, and the thickness of the base glaze on the ceramic body surface is 0.9 mm.

[0056] In step two, the melting temperature of the transparent frit is 1250℃, the holding time at the melting temperature is 20 minutes, the sieve mesh size is 200 mesh, and the sieve residue is 0.5%.

[0057] In step two, the base glaze is sieved through a 150-mesh screen, with a residue of 0.5%.

[0058] The weight percentage composition of the ceramic body raw materials in step three is as follows: coal gangue 40%, kaolin 20%, potassium feldspar 15%, calcite 5%, and wollastonite 20%. Example 3

[0059] A method for preparing a three-dimensional phase-separated glaze for decorating coal gangue ceramic bodies, comprising a base glaze and a top glaze.

[0060] The weight percentage composition of the glaze raw material is as follows: quartz 18%, calcite 14%, kaolin 6%, zinc oxide 6%, calcium phosphate 13%, potassium feldspar 26%, calcium borate 3%, tin dioxide 6%, spodumene 4%, and coloring oxide 4%.

[0061] The base glaze raw material has the following weight percentage composition: quartz 15%, wollastonite 15%, kaolin 10%, zinc oxide 11%, calcium phosphate 16%, spodumene 16%, titanium dioxide 6%, calcium borate 6%, coal gangue 3%, and coloring oxide 2%;

[0062] The preparation method comprises the following steps:

[0063] Step 1: After preparing the surface glaze according to the formula, the mixture is ball-milled and sieved to obtain a glaze slurry with a specific gravity of 1.7 g / cm³. 3 ;

[0064] Step Two: Mix 10% quartz, 10% wollastonite, 20% spodumene, and 5% calcium borate from the base glaze formula until homogeneous. After melting, water quenching, ball milling, sieving, and drying, obtain a transparent frit. Mix the transparent frit with the other raw materials from the base glaze formula until homogeneous. After ball milling and sieving, obtain a glaze slurry with a specific gravity of 1.3 g / cm³. 3 ;

[0065] Step 3: Apply the base glaze obtained in Step 2 to the surface of the bisque-fired ceramic body. After drying, spray the top glaze obtained in Step 1 onto the surface of the base glaze.

[0066] Step 4: Place the glazed ceramic body into the kiln and fire it in an oxidizing atmosphere. Heat it to 1270℃ at a rate of 2.0℃ / min, then hold it for 8 minutes, then rapidly cool it to 1040℃, then hold it for 70 minutes, then slowly cool it to 800℃ at a rate of 2.5℃ / min, and then cool it down with the kiln to obtain the product.

[0067] In step one, the coloring oxide of the surface glaze is Co2O. 3， The base glaze is colored with CuO.

[0068] The ball milling process for the surface glaze in step one takes 7 hours, the sieve mesh size is 100 mesh, and the residue is 0.5%.

[0069] In step three, the thickness of the top glaze on the base glaze surface is 1.7 mm, and the thickness of the base glaze on the ceramic body surface is 1.1 mm.

[0070] In step two, the melting temperature of the transparent frit is 1250℃, the holding time at the melting temperature is 25 minutes, the sieve mesh size is 200 mesh, and the sieve residue is 0.5%.

[0071] In step two, the base glaze is sieved through a 150-mesh screen, with a residue of 0.5%.

[0072] The weight percentage composition of the ceramic body raw materials in step three is as follows: coal gangue 35%, kaolin 17%, potassium feldspar 20%, calcite 9%, and wollastonite 19%. Example 4

[0073] A method for preparing a three-dimensional phase-separated glaze for decorating coal gangue ceramic bodies, comprising a base glaze and a top glaze.

[0074] The weight percentage composition of the glaze raw material is as follows: quartz 16%, calcite 15%, kaolin 5%, zinc oxide 5%, calcium phosphate 10%, potassium feldspar 30%, calcium borate 2%, tin dioxide 10%, spodumene 5%, and coloring oxide 2%.

[0075] The base glaze raw material has the following weight percentage composition: quartz 15%, wollastonite 11%, kaolin 5%, zinc oxide 10%, calcium phosphate 16%, spodumene 15%, titanium dioxide 10%, calcium borate 10%, coal gangue 3%, and coloring oxide 5%;

[0076] The preparation method comprises the following steps:

[0077] Step 1: After preparing the surface glaze according to the formula, the mixture is ball-milled and sieved to obtain a glaze slurry with a specific gravity of 1.8 g / cm³. 3 ;

[0078] Step Two: Mix 10% quartz, 11% wollastonite, 16% spodumene, and 6% calcium borate from the base glaze formula until homogeneous. After melting, water quenching, ball milling, sieving, and drying, obtain a transparent frit. Mix the transparent frit with the other raw materials from the base glaze formula until homogeneous. After ball milling and sieving, obtain a glaze slurry with a specific gravity of 1.2 g / cm³. 3 ;

[0079] Step 3: Apply the base glaze obtained in Step 2 to the surface of the bisque-fired ceramic body. After drying, spray the top glaze obtained in Step 1 onto the surface of the base glaze.

[0080] Step 4: Place the glazed ceramic body into the kiln and fire it in an oxidizing atmosphere. Heat it to 1280℃ at a rate of 2.5℃ / min, then hold it for 10 min, then rapidly cool it to 1050℃, then hold it for 90 min, then slowly cool it to 800℃ at a rate of 2.5℃ / min, and then cool it down with the kiln to obtain the product.

[0081] In step one, the coloring oxide of the glaze is Cr2O3.

[0082] The ball milling process for the surface glaze in step one takes 8 hours, the sieve mesh size is 100 mesh, and the residue is 0.5%.

[0083] In step three, the thickness of the top glaze on the base glaze surface is 1.8 mm, and the thickness of the base glaze on the ceramic body surface is 1.2 mm.

[0084] In step two, the melting temperature of the transparent frit is 1250℃, the holding time at the melting temperature is 30 minutes, the sieve mesh size is 200 mesh, and the sieve residue is 0.5%.

[0085] In step two, the base glaze is sieved through a 150-mesh screen, with a residue of 0.5%.

[0086] The weight percentage composition of the ceramic body raw materials in step three is as follows: 35% coal gangue, 15% kaolin, 20% potassium feldspar, 10% calcite, and 20% wollastonite.

[0087] from Figures 1 to 4 It can be seen that as the amount of tin dioxide in the glaze raw materials increases and the low-temperature holding time during firing is extended, the size difference between titanium sphene crystals and tin dioxide crystals in the glaze of the products obtained in Examples 1 to 4 becomes larger and larger, and the three-dimensional decorative effect of the glaze becomes more and more obvious and has a better gloss.

Claims

1. A method for preparing a three-dimensional phase-separated glaze for decorating coal gangue ceramic bodies, characterized in that: Including base glaze and top glaze, The weight percentage composition of the glaze raw material is as follows: quartz 15-20%, calcite 10-15%, kaolin 5-10%, zinc oxide 5-10%, calcium phosphate 10-15%, potassium feldspar 25-30%, calcium borate 2-5%, tin dioxide 5-10%, spodumene 3-5%, and coloring oxide 2-5%; The base glaze raw material has the following weight percentage composition: quartz 15-20%, wollastonite 10-15%, kaolin 5-10%, zinc oxide 10-15%, calcium phosphate 15-20%, spodumene 15-20%, titanium dioxide 5-10%, calcium borate 5-10%, coal gangue 2-5%, and coloring oxide 2-5%. The preparation method comprises the following steps: Step 1: After preparing the surface glaze according to the formula, the mixture is ball-milled and sieved to obtain a glaze slurry with a specific gravity of 1.5–1.8 g / cm³. 3 ; Step Two: Mix 10% quartz, 10-15% wollastonite, 15-20% spodumene, and 5-10% calcium borate from the base glaze formula until homogeneous. After melting, water quenching, ball milling, sieving, and drying, obtain a transparent frit. Mix the transparent frit with the other raw materials from the base glaze formula until homogeneous, then ball mill and sieve to obtain a glaze slurry with a specific gravity of 1.1-1.3 g / cm³. 3 ; Step 3: Apply the base glaze obtained in Step 2 to the surface of the bisque-fired ceramic body. After drying, spray the top glaze obtained in Step 1 onto the surface of the base glaze. Step 4: Place the glazed ceramic body into the kiln and fire it in an oxidizing atmosphere. Heat it to 1250-1280℃ at a rate of 1.5-2.5℃ / min, then hold it for 5-10 minutes, then rapidly cool it to 1050-1000℃, then hold it for 30-90 minutes, then slowly cool it to 800℃ at a rate of 2.5℃ / min, and then cool it down with the furnace to obtain the finished product.

2. The preparation method according to claim 1, characterized in that: The coloring oxides in the base glaze and top glaze formulations are one or a combination of two of Co2O3, CuO, and Cr2O3 in equal weight proportions.

3. The preparation method according to claim 1, characterized in that: The ball milling process for the surface glaze in step one takes 6 to 8 hours, the sieve mesh size is 100 mesh, and the residue is 0.5%.

4. The preparation method according to claim 1, characterized in that: In step three, the thickness of the top glaze on the base glaze surface is 1.5–1.8 mm, and the thickness of the base glaze on the ceramic body surface is 0.8–1.2 mm.

5. The preparation method according to claim 1, characterized in that: In step two, the melting temperature of the transparent frit is 1250℃, the holding time at the melting temperature is 15-30 minutes, the sieve mesh size is 200 mesh, and the sieve residue is 0.5%.

6. The preparation method according to claim 1, characterized in that: In step two, the base glaze is sieved through a 150-mesh screen, with a residue of 0.5%.

7. The preparation method according to claim 1, characterized in that: The weight percentage composition of the ceramic body raw materials in step three is as follows: coal gangue 35-40%, kaolin 15-20%, potassium feldspar 15-20%, calcite 5-10%, and wollastonite 15-20%.

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