Plant ash alkali glaze Ru porcelain and preparation method thereof

Abstract

The invention relates to the technical field of processing and preparation of Ru-kiln porcelain, in particular to plant ash alkali glaze Ru porcelain and a preparation method thereof. The blank body is prepared from the following raw materials in parts by mass: 29-33 parts of half-slope soil, 24-27 parts of daying soil, 32-36 parts of pyrophyllite, 5-7 parts of purple soil and 3-4 parts of iron ore; the glaze is prepared from the following raw materials in parts by mass: 27-32 parts of plant ash, 5-8 parts of agate, 37-42 parts of potassium-sodium feldspar in North Mountain of Ruzhou, 23-27 parts of argil in Lushan and 1-3 parts of iron ore. The color of the plant ash alkali glaze Ru porcelain is azure which is infinitely close to the traditional azure of Song Ru-kiln porcelain; through refining treatment and reasonable proportioning of the materials, the strength and elasticity of the product are effectively improved, the expansion coefficient of the porcelain body is reduced to about 10% from the original 16.5%, the weight of the porcelain under the same volume is reduced by about 15%, and the overall yield of the product can be improved to more than 60%.

Description

Technical Field

[0001] This invention relates to the field of Ru ware porcelain processing and preparation technology, and in particular to a Ru ware porcelain with plant ash alkali glaze and its preparation method. Background Technology

[0002] Ru ware is one of the five famous porcelains of the Song Dynasty. It is renowned for its distinctive characteristics: "blue as the sky, surface like jade, cicada wing patterns, sparse morning star patterns, and sesame-seed-like glaze marks," as well as its texture that is "like jade but not jade, yet surpasses jade." It is often praised as "the finest of all." The glaze color of Ru ware is a composite color of monochrome glazes. Its core element is the different variations in light refraction caused by the crystallization of calcium feldspar. The glaze color, glaze quality, and glaze layer depend on many factors, including the preparation and proportion of materials and the firing atmosphere. While there are patterns, there is no fixed formula; it is a complex, variable process that is difficult to control stably.

[0003] As the premier type of celadon, Ru ware possesses high artistic and collectible value. With the continuous improvement of people's living standards, the demand for Ru ware is becoming increasingly diversified, and the requirements for its quality are also rising. Therefore, the key to the revival of Ru ware lies in how to meet the aesthetic needs of modern people, improve the overall performance of Ru ware, expand new varieties of Ru ware while restoring the original appearance of Ru kiln celadon, and create new types of Ru ware that conform to modern aesthetic concepts. Summary of the Invention

[0004] In view of this, the present invention provides a Ru porcelain with plant ash alkali glaze and its preparation method; after preparation by the method of the present invention, the resulting Ru porcelain with plant ash alkali glaze is sky blue, which is very close to the traditional sky blue color of Song Dynasty Ru kiln porcelain; the present invention effectively improves the strength and elasticity of the product by refining the materials and making reasonable proportions, reducing the coefficient of expansion of the porcelain body from the original 16.5% to about 10%, reducing the weight of the porcelain of the same volume by about 15%, and improving the overall yield of the product by more than 60%.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a Ru porcelain with a plant ash glaze, comprising two parts: a body and a glaze.

[0007] The embryo is prepared from the following raw materials in parts by weight: 29-33 parts of Banpo soil, 24-27 parts of Daying soil, 32-36 parts of pyrophyllite, 5-7 parts of purple soil, and 3-4 parts of iron ore.

[0008] The glaze is prepared from the following raw materials in parts by weight: 27-32 parts of wood ash, 5-8 parts of agate, 37-42 parts of Ruzhou Beishan potassium sodium feldspar, 23-27 parts of Lushan white clay, and 1-3 parts of iron ore.

[0009] The present invention also provides a method for preparing the aforementioned plant ash alkali glaze Ru porcelain, comprising the following steps;

[0010] (1) After crushing and mixing all the raw materials in the embryo, the embryo is ball-milled, iron removed, sieved, pressed into cakes and pulled into shape, and then fired to obtain the plain embryo.

[0011] (2) Wash the wood ash with water and then sieve it;

[0012] (3) The agate stone is successively calcined and crushed;

[0013] (4) The white clay from Lushan is successively washed with water, aged, and calcined;

[0014] (5) The plant ash, agate, Lushan white clay and other raw materials of glaze after step (2) to (4) are crushed, mixed, ball-milled, iron removed and sieved in sequence to obtain plant ash alkaline glaze slurry.

[0015] (6) Apply the plant ash alkali glaze slurry obtained in step (5) to the unglazed body in step (1), and after the glaze slurry dries, send it into the kiln to fire and obtain plant ash alkali glaze Ru porcelain.

[0016] Preferably, the ball milling time in step (1) is 8 to 10 hours and the rotation speed is 30 to 40 r / min.

[0017] Preferably, the firing time in step (1) is 6 to 8 hours and the temperature is 800 to 900°C.

[0018] Preferably, the mass ratio of wood ash to water in the washing process described in step (2) is 1:1.5 to 2.5.

[0019] Preferably, the calcination process described in step (3) is carried out in an oxidizing atmosphere by heating from room temperature to 700-900°C at a rate of 100°C / h and then naturally cooling.

[0020] Preferably, the calcination process in step (4) is carried out in an oxidizing atmosphere by heating from room temperature to 800-1000℃ at a rate of 80-120℃ / h and then naturally cooling.

[0021] Preferably, the ball milling time in step (5) is 9 to 10 hours and the rotation speed is 30 to 40 r / min.

[0022] Preferably, the density of the plant ash alkali glaze slurry in step (6) is 45-55 g / cm³. 3 The glaze thickness is 0.8–1.2 mm.

[0023] Preferably, the firing process in step (6) includes the following stages:

[0024] Oxidation stage:

[0025] (A1) 0~300℃ is the preheating stage, which mainly removes the natural water in the product blank. The temperature rise is slow and the heating rate is 1~2℃ / min.

[0026] (A2) 300~1000℃ is the strong oxidation stage, and the heating rate is 2~3℃ / min;

[0027] Preheating and heat preservation stage before heat transfer:

[0028] The main purpose is to level the temperature difference between the top and bottom of the kiln chamber, ensuring that the product inside the kiln chamber is fully oxidized, and to prepare for the transition and reduction stage. During this stage, the temperature is held at 1000℃ for 30 to 50 minutes, ensuring that the temperature does not rise or fall.

[0029] Restoration phase:

[0030] (B1) 1000~1100℃, strong reduction stage, heating rate is 0.5~1℃ / min;

[0031] (B2) 1100~1180℃, weak reduction stage, heating rate is 1℃ / min;

[0032] (B3) 1180~1200℃, isothermal reduction stage, ensure that the temperature increases by 1℃ every 5~10min, and the time is 100~200min;

[0033] Cooling phase:

[0034] Close the liquefied gas valve and all fire outlets. Pull open the gate to reduce the temperature from 1200℃ to 200℃. Control the gate gap. Once the kiln temperature drops below 150℃, open the kiln door and remove the product to obtain Ru porcelain with plant ash alkali glaze.

[0035] It contains at least the following beneficial technical effects:

[0036] 1. The glaze color is a sky blue that changes with the light, which is very close to the traditional sky blue color of Ru kiln porcelain in the Song Dynasty.

[0037] 2. It has a warm and smooth texture, and is not greasy. The surface of the porcelain forms a highly dense vitrified film, which makes it smooth. The increase in the glaze burn-off rate and the calcium precipitation under the glaze increase the microscopic unevenness of the glaze surface (visible with a 50x magnifying glass at a 45-degree angle to the porcelain surface), which reduces the resistance to touch, so it is not greasy.

[0038] 3. The refined processing and reasonable proportioning of raw materials effectively improve the strength and elasticity of the product. The coefficient of expansion of the porcelain body is reduced from 16.5% to about 10%, and the weight of porcelain of the same volume is reduced by about 15%, which can increase the overall yield of the product by more than 60%. Detailed Implementation

[0039] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention. The invention will now be described with reference to specific embodiments. It should be noted that these embodiments are merely descriptive and do not limit the invention in any way.

[0040] Banpo clay originates from Daguogou Village, Baiyao Town, Ruzhou City, and comprises the following components in the indicated mass ratios: silicon dioxide 56.06%, aluminum oxide 29.01%, ferric oxide 0.92%, calcium oxide 0.23%, magnesium oxide 0.32%, potassium oxide 2.14%, sodium oxide 0.15%, and titanium dioxide 0.8%. It is one of the main raw materials for the green body, forming a mullite structure at high temperatures, which imparts high strength and high-temperature resistance to the green body.

[0041] Daying clay originates from Qingliangsi Village, Baofeng County, Pingdingshan City. It comprises the following components in the indicated mass ratios: silicon dioxide 62.65%, aluminum oxide 23.21%, ferric oxide 1.53%, calcium oxide 0.44%, magnesium oxide 0.67%, potassium oxide 2.37%, sodium oxide 0.16%, and titanium dioxide 0.99%. It is a type of clay and one of the main raw materials for clay blanks, possessing plasticity, refractoriness, and sintering properties.

[0042] Pyrophyllite is produced in Beishan, Lingtou Town, Ruzhou City. The ore contains 80% to 90% pyrophyllite, which is composed of the following components in the following mass ratio: silicon dioxide 76.71%, aluminum oxide 17.78%, ferric oxide 0.20%, titanium dioxide, potassium oxide 0.02%, sodium oxide 0.12%, calcium oxide 0.13%, and magnesium oxide 0.04%. The platy structure of pyrophyllite gives the blank good plasticity and reduces cracks and deformation during the molding process.

[0043] Purple clay originates from Mangchuan Town, Ruzhou City. It comprises the following components in the indicated mass ratios: silicon dioxide 60%, aluminum oxide 19.57%, ferric oxide 7.86%, calcium oxide 0.65%, magnesium oxide 1.62%, potassium oxide 3.96%, sodium oxide 0.16%, and titanium dioxide 0.74%. It is a type of clay with plasticity, and it supplements the content of magnesium, iron, calcium, etc.

[0044] The iron ore is produced in Mangchuan Town, Ruzhou City. It contains the following components in the indicated mass ratios: silicon dioxide 17.37%, aluminum oxide 7.19%, ferric oxide 60.78%, calcium oxide 0.95%, magnesium oxide 0.44%, potassium oxide 0.27%, sodium oxide 0.01%, and titanium dioxide 1.06%. Its main function is coloration.

[0045] The wood ash is sourced from chestnut wood collected in the Ruyang mountain area. It comprises the following components in the indicated mass ratios: silicon dioxide 8.75%, aluminum oxide 2.29%, ferric oxide 0.76%, calcium oxide 43.23%, magnesium oxide 3.98%, potassium oxide 1.84%, sodium oxide 0.25%, and titanium dioxide 0.14%. The alkaline solvent helps with the crystallization of calcium feldspar, reducing the thickness of the glaze.

[0046] The agate stone originates from the vicinity of Baofeng Daying. It comprises the following components in the indicated mass ratios: 98.17% silicon dioxide, 0.09% aluminum oxide, 0.06% ferric oxide, 0.44% calcium oxide, 0.13% magnesium oxide, and 0.53% sodium oxide. It provides the skeletal structure, regulates the coefficient of thermal expansion, and enhances the hardness and gloss of the glaze.

[0047] Ruzhou Beishan potassium-sodium feldspar originates from Beishan, Lingtou Town, Ruzhou City. It comprises the following components in the indicated mass ratios: silicon dioxide 72.1%, aluminum oxide 15.29%, ferric oxide 0.09%, calcium oxide 0.14%, magnesium oxide 0.19%, potassium oxide 9.12%, sodium oxide 2.56%, and titanium dioxide 0.01%. It acts as a flux, lowering the firing temperature, forming eutectic with other components, improving glaze smoothness, and enhancing glaze gloss and hardness.

[0048] Lushan white clay originates from Lushan County, Pingdingshan City. It comprises the following components in the indicated mass ratios: silicon dioxide 40.1%, aluminum oxide 38.2%, ferric oxide 0.39%, calcium oxide 0.03%, magnesium oxide 0.01%, potassium oxide 0.1%, sodium oxide 0.02%, and titanium dioxide 0.55%. It is a type of clay used to supplement the alumina content in clay glazes, enhancing the density, hardness, and wear resistance of ceramic products.

[0049] Example 1

[0050] This invention provides a Ru porcelain with a plant ash glaze, comprising two parts: a body and a glaze.

[0051] The embryo is prepared from the following raw materials in parts by weight: 29 parts of Banpo soil, 24 parts of Daying soil, 32 parts of pyrophyllite, 5 parts of purple soil, and 3 parts of iron ore.

[0052] The glaze is prepared from the following raw materials in parts by weight: 27 parts wood ash, 5 parts agate, 37 parts Ruzhou Beishan potassium sodium feldspar, 23 parts Lushan white, and 1 part iron ore.

[0053] The present invention also provides a method for preparing the aforementioned plant ash alkali glaze Ru porcelain, comprising the following steps;

[0054] (1) After crushing all the raw materials in the embryo, mix them. Then, ball mill the mixture for 10 hours at 30 r / min. After removing iron, pass it through a 100-mesh sieve. After sieving, filter the water through a mud filter to make mud cake. Finally, refine the mud cake through a vacuum mud refiner and shape it into an embryo. Firing it at 800℃ for 8 hours will yield the raw embryo.

[0055] (2) Wash the wood ash with 1.5 times the weight of water, let it stand to settle and pour off the supernatant. Repeat this step 8 times and then sieve it through a 120-mesh screen.

[0056] (3) The agate stone is heated from room temperature to 700℃ at 100℃ / h in an oxidizing atmosphere and then cooled naturally, and then crushed and passed through a 30-mesh sieve.

[0057] (4) The Lushan white clay is successively washed, aged and calcined; the washing process is to wash the Lushan white clay with 1.5 times the mass of water, let it stand to settle and pour off the supernatant, and repeat twice; the aging process is to pass the washed Lushan white clay through a 45-mesh sieve to remove the slag and place it in a gypsum tank to air dry naturally; the calcination process is to heat the clay from room temperature to 800℃ at 80℃ / h under an oxidizing atmosphere and then cool it naturally.

[0058] (5) The plant ash, agate, Lushan white clay and other raw materials of glaze after processing (2) to (4) are crushed to 25 mesh. The crushed raw materials are mixed and then ball-milled for 10 hours at 30 r / min. After iron removal by iron removal machine, the mixture is passed through a 120 mesh sieve to obtain plant ash alkaline glaze slurry.

[0059] (6) Apply the plant ash alkali glaze slurry obtained in step (5) to the unglazed body in step (1). After the glaze slurry dries, it is sent to the kiln for firing to obtain plant ash alkali glaze Ru porcelain; the density of the plant ash alkali glaze slurry is measured to be 45 g / cm³ using a glass float densitometer. 3 The glaze thickness is 1.2mm.

[0060] The firing of the glazed bisque after drying includes the following stages:

[0061] Oxidation stage:

[0062] (A1) 0~300℃ is the preheating stage, and the temperature rises slowly at a rate of 1℃ / min.

[0063] (A2) 300~1000℃ is the strong oxidation stage, and the heating rate is 2℃ / min.

[0064] Preheating stage before heat transfer: Hold at 1000℃ for 30 minutes to ensure that the temperature does not rise or fall.

[0065] Restoration phase:

[0066] (B1) 1000~1100℃, strong reduction stage, heating rate is 0.5℃ / min;

[0067] (B2) 1100~1180℃, weak reduction stage, heating rate is 1℃ / min;

[0068] (B3) 1180~1200℃, isothermal reduction stage, ensure that the temperature increases by 1℃ every 5 minutes, and the time is 60 minutes.

[0069] Cooling phase:

[0070] Close the liquefied gas valve and all fire outlets. Pull open the gate to reduce the temperature from 1200℃ to 200℃. Control the gate gap. Once the kiln temperature drops below 150℃, open the kiln door and remove the product to obtain Ru porcelain with plant ash alkali glaze.

[0071] Example 2

[0072] This invention provides a Ru porcelain with a plant ash glaze, comprising two parts: a body and a glaze.

[0073] The embryo is prepared from the following raw materials in parts by weight: 33 parts of Banpo soil, 27 parts of Daying soil, 36 parts of pyrophyllite, 7 parts of purple soil, and 4 parts of iron ore.

[0074] The glaze is prepared from the following raw materials in parts by weight: 32 parts wood ash, 8 parts agate, 42 parts Ruzhou Beishan potassium sodium ore, 27 parts Lushan white clay, and 3 parts iron ore.

[0075] The present invention also provides a method for preparing the aforementioned plant ash alkali glaze Ru porcelain, comprising the following steps;

[0076] (1) After crushing all the raw materials in the embryo, mix them. Then, ball mill the mixture for 8 hours at 40 r / min. After removing iron, pass it through a 100-mesh sieve. After sieving, filter the water through a mud filter to make mud cake. Finally, refine the mud cake through a vacuum mud refiner and shape it into an embryo. Firing it at 900℃ for 6 hours will yield the raw embryo.

[0077] (2) Wash the wood ash with 2.5 times the weight of water, let it stand to settle and pour off the supernatant. Repeat this step 7 times and then sieve it through a 120-mesh screen.

[0078] (3) The agate stone is heated from room temperature to 900℃ at 100℃ / h in an oxidizing atmosphere and then cooled naturally, and then crushed and passed through a 20-mesh sieve.

[0079] (4) The Lushan white clay is successively washed, aged and calcined; the washing process is to wash the Lushan white clay with 2.5 times the mass of water, let it stand to settle and pour off the supernatant, and repeat once; the aging process is to pass the washed Lushan white clay through a 55-mesh sieve to remove the slag and place it in a gypsum tank to air dry naturally; the calcination process is to heat the clay from room temperature to 1000℃ at 120℃ / h under an oxidizing atmosphere and then cool it naturally.

[0080] (5) The plant ash, agate, Lushan white clay and other raw materials of glaze after processing (2) to (4) are crushed to 35 mesh. The crushed raw materials are mixed and then ball-milled at 40 r / min for 9 hours. After iron removal by iron removal machine, the mixture is passed through a 110 mesh sieve to obtain plant ash alkaline glaze slurry.

[0081] (6) Apply the plant ash alkali glaze slurry obtained in step (5) to the unglazed body in step (1). After the glaze slurry dries, it is sent to the kiln for firing to obtain plant ash alkali glaze Ru porcelain; the density of the plant ash alkali glaze slurry is measured to be 55 g / cm³ using a glass float densitometer. 3 The glaze thickness is 0.8mm.

[0082] The firing of the glazed bisque after drying includes the following stages:

[0083] Oxidation stage:

[0084] (A1) 0~300℃ is the preheating stage, and the temperature rises slowly at a rate of 2℃ / min.

[0085] (A2) 300~1000℃ is the strong oxidation stage, and the heating rate is 3℃ / min.

[0086] Preheating stage before heat transfer: Hold at 1000℃ for 50 minutes, ensuring that the temperature does not rise or fall.

[0087] Restoration phase:

[0088] (B1) 1000~1100℃, strong reduction stage, heating rate is 1℃ / min;

[0089] (B2) 1100~1180℃, weak reduction stage, heating rate is 1℃ / min;

[0090] (B3) 1180~1200℃, isothermal reduction stage, ensure that the temperature increases by 1℃ every 10min, and the time is 200min.

[0091] Cooling phase:

[0092] Close the liquefied gas valve and all fire outlets. Pull open the gate to reduce the temperature from 1200℃ to 200℃. Control the gate gap. Once the kiln temperature drops below 150℃, open the kiln door and remove the product to obtain Ru porcelain with plant ash alkali glaze.

[0093] Example 3

[0094] This invention provides a Ru porcelain with a plant ash glaze, comprising two parts: a body and a glaze.

[0095] The embryo is prepared from the following raw materials in parts by weight: 32 parts of Banpo soil, 25 parts of Daying soil, 34 parts of pyrophyllite, 6 parts of purple soil, and 3 parts of iron ore.

[0096] The glaze is prepared from the following raw materials in parts by weight: 30 parts wood ash, 6 parts agate, 39 parts Ruzhou Beishan potassium sodium feldspar, 25 parts Lushan white clay, and 2 parts iron ore.

[0097] The present invention also provides a method for preparing the aforementioned plant ash alkali glaze Ru porcelain, comprising the following steps;

[0098] (1) After crushing all the raw materials in the embryo, mix them. Then, ball mill the mixture for 9 hours at 36 r / min. After removing iron, pass it through a 100-mesh sieve. After sieving, filter the water through a mud filter to make mud cake. Finally, refine the mud cake through a vacuum mud refiner and shape it into an embryo. Firing it at 850℃ for 7 hours will yield the raw embryo.

[0099] (2) Wash the wood ash with 2 times the amount of water by weight, let it stand to settle and pour off the supernatant. Repeat this step 7 times and then sieve it through a 120-mesh screen.

[0100] (3) The agate stone is heated from room temperature to 800℃ at 100℃ / h in an oxidizing atmosphere and then cooled naturally, and then crushed and passed through a 25-mesh sieve.

[0101] (4) The Lushan white clay is successively washed, aged and calcined; the washing process is to wash the Lushan white clay with 2 times the mass of water, let it stand to settle and pour off the supernatant, and repeat twice; the aging process is to pass the washed Lushan white clay through a 50-mesh sieve to remove the slag and place it in a gypsum tank to air dry naturally; the calcination process is to heat the clay from room temperature to 900℃ at 100℃ / h under an oxidizing atmosphere and then cool it naturally.

[0102] (5) The plant ash, agate, Lushan white clay and other raw materials of glaze after processing (2) to (4) are crushed to 30 mesh. The crushed raw materials are mixed and then ball-milled at 36 r / min for 10 hours. After iron removal by iron removal machine, the mixture is passed through a 100 mesh sieve to obtain plant ash alkaline glaze slurry.

[0103] (6) Apply the plant ash alkali glaze slurry obtained in step (5) to the unglazed body in step (1). After the glaze slurry dries, it is sent to the kiln for firing to obtain plant ash alkali glaze Ru porcelain; the density of the plant ash alkali glaze slurry is measured to be 50 g / cm³ using a glass float densitometer. 3 The glaze thickness is 1.0 mm.

[0104] The firing of the glazed bisque after drying includes the following stages:

[0105] Oxidation stage:

[0106] (A1) 0~300℃ is the preheating stage, and the temperature rises slowly at a rate of 1.5℃ / min;

[0107] (A2) 300~1000℃ is the strong oxidation stage, and the heating rate is 2.5℃ / min.

[0108] Preheating stage before heat transfer: Hold at 1000℃ for 40 minutes, ensuring that the temperature does not rise or fall.

[0109] Restoration phase:

[0110] (B1) 1000~1100℃, strong reduction stage, heating rate is 0.8℃ / min;

[0111] (B2) 1100~1180℃, weak reduction stage, heating rate is 1℃ / min;

[0112] (B3) 1180~1200℃, isothermal reduction stage, ensure that the temperature increases by 1℃ every 8 minutes, and the time is 120 minutes.

[0113] Cooling phase:

[0114] Close the liquefied gas valve and all fire outlets. Pull open the gate to reduce the temperature from 1200℃ to 200℃. Control the gate gap. Once the kiln temperature drops below 150℃, open the kiln door and remove the product to obtain Ru porcelain with plant ash alkali glaze.

[0115] 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 principle 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 type of Ru ware with a plant ash alkali glaze, characterized in that, It consists of two parts: the body and the glaze. The embryo is prepared from the following raw materials in parts by weight: 29-33 parts of Banpo soil, 24-27 parts of Daying soil, 32-36 parts of pyrophyllite, 5-7 parts of purple soil, and 3-4 parts of iron ore. The glaze is prepared from the following raw materials in parts by weight: 27-32 parts of wood ash, 5-8 parts of agate, 37-42 parts of Ruzhou Beishan potassium sodium feldspar, 23-27 parts of Lushan white clay, and 1-3 parts of iron ore.

2. A method for preparing Ru porcelain with plant ash alkali glaze as described in claim 1, characterized in that, Includes the following steps; (1) After crushing and mixing all the raw materials in the embryo, the embryo is ball-milled, iron removed, sieved, pressed into cakes and pulled into shape, and then fired to obtain the plain embryo. (2) Wash the wood ash with water and then sieve it; (3) The agate stone is successively calcined and crushed; (4) The white clay from Lushan is successively washed with water, aged, and calcined; (5) The plant ash, agate, Lushan white clay and other raw materials of glaze after step (2) to (4) are crushed, mixed, ball-milled, iron removed and sieved in sequence to obtain plant ash alkaline glaze slurry. (6) Apply the plant ash alkali glaze slurry obtained in step (5) to the unglazed body in step (1), and after the glaze slurry dries, send it into the kiln to fire and obtain plant ash alkali glaze Ru porcelain.

3. The preparation method according to claim 2, characterized in that, The ball milling time in step (1) is 8 to 10 hours, and the rotation speed is 30 to 40 r / min.

4. The preparation method according to claim 2, characterized in that, The firing time in step (1) is 6 to 8 hours and the temperature is 800 to 900°C.

5. The preparation method according to claim 2, characterized in that, In step (2), the mass ratio of wood ash to water during the washing process is 1:1.5 to 2.

5.

6. The preparation method according to claim 2, characterized in that, The calcination process described in step (3) involves heating the temperature from room temperature to 700-900℃ at a rate of 100℃ / h under an oxidizing atmosphere, followed by natural cooling.

7. The preparation method according to claim 2, characterized in that, The calcination process described in step (4) involves heating the temperature from room temperature to 800-1000℃ at a rate of 80-120℃ / h under an oxidizing atmosphere, followed by natural cooling.

8. The preparation method according to claim 2, characterized in that, The ball milling time in step (5) is 9 to 10 hours, and the rotation speed is 30 to 40 r / min.

9. The preparation method according to claim 2, characterized in that, The density of the plant ash alkali glaze slurry mentioned in step (6) is 45-55 g / cm³. 3 The glaze thickness is 0.8–1.2 mm.

10. The preparation method according to claim 2, characterized in that, The firing process described in step (6) includes the following stages: Preheating stage: 0~300℃, heating rate is 1~2℃ / min; Strong oxidation stage: 300~1000℃, heating rate is 2~3℃ / min; Preheating stage before heat transfer: Hold at 1000℃ for 30-50 minutes; Strong reduction stage: 1000~1100℃, heating rate is 0.5~1℃ / min; Weak reduction stage: 1100~1180℃, heating rate is 1℃ / min; Isothermal reduction stage: 1180~1200℃, heating rate is 1℃ / 5~10min; Cooling stage: Cool down from 1200℃ to 200℃, and remove the product when the temperature is ≤150℃ to obtain Ru porcelain with plant ash alkali glaze.