A greenish bean glaze porcelain and a preparation method thereof

Abstract

A kind of bean green glaze porcelain and its preparation method, including the preparation of blank and the preparation of glaze, the preparation of blank: by raw material mixing ball milling, mud slurry is obtained by sieving, mud cake is obtained by filtering, mud strip is obtained by cutting after vacuumizing and storing;Mud slurry is formed by hollow grouting method, and body is obtained by processing;The body is formed by adopting the conventional body shaping mode, and the body is obtained by processing;The body is loaded into kiln, biscuit is obtained, and glaze is prepared: raw material is ball milled, glaze slurry is obtained by sieving, and the concentration of glaze slurry is adjusted to 50-55 degrees;Water is applied on the body to glaze, glaze is repaired, and the body with glaze is loaded into kiln, and the body is taken out after natural cooling to room temperature, and bean green glaze porcelain is obtained.The development of bean green glaze Ru porcelain is successful, and it is put into production, which is the recovery of a kind of glaze color of Ru kiln, not only saves energy, but also produces good artistic effect, is loved by people from all walks of life, and receives good economic benefit and social benefit.

Description

Technical Field

[0001] This invention relates to the field of ceramic technology, specifically to a celadon-glazed porcelain and its preparation method. Background Technology

[0002] Ru ware culture is an important component of Song Dynasty culture. It is uniquely characterized by its exquisite craftsmanship, beautiful shapes, lustrous glaze, and elegant, understated charm, marking a significant epoch-making milestone in the history of Chinese celadon. Historical records indicate that Ru ware was one of the five famous kilns of the Song Dynasty, renowned for its light and subtle pale blue glaze, surpassing other kilns of the time. Ru ware was made for the imperial court, with an extremely short production period, resulting in exceptional craftsmanship and a rarity among surviving pieces. Towards the end of the Northern Song Dynasty, with the southward advance of the Jin army and the relocation of the Song court, Ru ware disappeared due to the war.

[0003] After the founding of the People's Republic of China, through the unremitting efforts of several generations, Ru ware with various glazes gradually unveiled its mysterious veil. The Ru ware discovered by researchers has a thin body, dense texture, even glaze, and delicate shape. The glaze is lustrous, with a bluish-yellow hue and a greenish tinge. It also features exquisite patterns formed by printing, incising, and carving techniques.

[0004] Ceramic products are durable and have high aesthetic value, but they are easily broken. Even after thousands of years of weathering underground, ceramic fragments are difficult to decompose, becoming environmental pollutants. In ceramic production areas, mountains of ceramic fragments accumulate. Meanwhile, porcelain clay, as a non-renewable resource, is becoming increasingly scarce.

[0005] We crushed the ceramic fragments and, through a reasonable ratio with various ceramic raw materials, and after hundreds of studies and firings, finally produced Ru porcelain with a celadon glaze. The glaze is pure, with a greenish-yellow hue and a yellowish-green hue, elegant and soft. The texture and glaze are extremely similar to the porcelain unearthed from the Yanhedian kiln site.

[0006] The development of Ru porcelain celadon glaze not only filled the gap in Ru porcelain glaze colors, but also effectively solved the problem of ceramic pollution. As a result, it has been affirmed by many industry experts, received high praise from consumers after being launched on the market, and has also achieved certain economic benefits. Summary of the Invention

[0007] To overcome the above shortcomings, the present invention provides a celadon glaze porcelain, including the preparation of the body and the glaze. The body comprises the following raw materials in parts by weight: 25-50 parts of Lingtou pyrophyllite, 15-50 parts of calcined bauxite, 30-70 parts of purple comb clay, and 15-40 parts of waste porcelain powder. The glaze comprises the following raw materials in parts by weight: 20-60 parts of Yanhedian crucible clay, 20-60 parts of purple comb clay, 20-60 parts of Xixia rutile, and 15-60 parts of Lingtou feldspar.

[0008] A method for preparing celadon-glazed porcelain includes the preparation of the unglazed body and the preparation of the glaze, with the specific steps as follows:

[0009] Preparation of unglazed ceramic body: Step 1: Crush ceramic fragments into powder, calcine bauxite in a kiln, and mix them together for later use;

[0010] Step 2: Add pyrophyllite and purple comb soil to Step 1, stir, add water and ball mill, sieve to remove iron and obtain mud slurry;

[0011] Step 3: Filter a portion of the mud slurry from Step 2 to obtain mud cakes, and bag them for later use;

[0012] Step 4: Vacuum the clay cake from Step 3, with a vacuum level between 0.1 and 1 kPa, cut and preserve it to obtain clay strips;

[0013] Step 5: Use the hollow casting method to shape, bond, refine, and carve the other part of the mud from Step 2 to obtain the body;

[0014] Step Six: Shape the clay strip from Step Four using conventional wheel throwing techniques, then refine and carve the blank to obtain the final shape;

[0015] Step 7: Load the blanks obtained in Step 5 into the kiln and fire them to obtain unglazed bodies.

[0016] Step 8: Grind the Yanhedian crucible clay, purple comb clay, Xixia rutile, and Lingtou feldspar according to the formula, and sieve to remove iron to obtain the glaze slurry;

[0017] Step 9: Adjust the glaze concentration from Step 8 to between 50 and 55 degrees, apply water and glaze to the unglazed body, and repair the glaze.

[0018] Step 10: Place the glazed body from Step 9 into the kiln and fire it in stages, raising the temperature to 1100-1300℃. Stop the fire and let it cool naturally to room temperature before removing it to obtain celadon glazed porcelain.

[0019] Further optimization is made, with the minimum temperature of the bauxite being 900℃~950℃.

[0020] Further optimization is achieved by setting the bisque firing temperature to 800–1000°C.

[0021] Further optimization involves the following steps: in step two, the mass ratio of raw materials, grinding balls, and water is 1–1.5:1.5–1:1.5–1, the grinding time is 13–17 hours, the ground slurry is filtered through 60–100 mesh and 90–110 mesh vibrating screens, and then iron is removed by a permanent magnet iron remover and a high-strength electromagnetic iron remover. The filtration and iron removal processes are repeated three times each to obtain mud.

[0022] To further optimize this process, in step five, the mud concentration is adjusted to 50–56 degrees before the preparation of the embryo.

[0023] Further optimization involves using a mass ratio of raw materials, grinding balls, and water of 1-1:1-0.5:1.5-0.5 in step eight, with a grinding time of 14-15 hours to obtain a glaze with a fineness of 0.5-0.7. The ground slurry is then discharged through a 60-100 mesh sieve, filtered through a 90-110 mesh vibrating sieve, and finally de-ironed using a magnetizer.

[0024] Further optimization involves staged heating and firing in step ten, which includes a preheating stage, an oxidation stage, a weak reduction stage, a strong reduction stage, a holding stage, and a cooling stage, specifically as follows:

[0025] Preheating stage: Aerobic firing is carried out at a temperature of 150-300℃ for 1.5-2.5 hours;

[0026] Oxidation stage: Aerobic firing is carried out at a temperature of 300-950℃ for 4-6 hours;

[0027] Weak reduction stage: When the temperature is 900-1000℃, close the gate two-thirds, control the oxygen content to be 0.6-1.2% and the carbon monoxide content to be 1-3%, the firing time to be 1-1.5h, and the temperature to be raised to 1000-1100℃;

[0028] Strong reduction stage: close the gate at a temperature of 1000-1080℃, control the oxygen content to be 0.1-1% and the carbon monoxide content to be 5.5-10%, the firing time to be 40-60 minutes, and the temperature to be raised to 1100-1200℃.

[0029] Insulation stage: Insulation is carried out at a temperature of 1100-1200℃ for 60-90 minutes;

[0030] Cooling phase: Open the valve to allow the temperature to drop naturally to room temperature.

[0031] The beneficial effects of this invention are as follows:

[0032] 1. The main components of Lingtou pyrophyllite are: silicon 75%, aluminum 16%, iron 1.0%, potassium 0.5%, sodium 0.6%, and loss on ignition 8%. Some silicon and aluminum react at high temperatures to form mullite, which forms the body skeleton. Another portion reacts with alkali metal and alkaline earth metal oxides in the raw materials at high temperatures to form a glassy substance that fills the spaces between the body skeleton, thus making the product denser, improving the thermal stability of ceramic products, and widening the firing range. Furthermore, it exhibits low shrinkage at high temperatures. Adding pyrophyllite to ceramic bodies can lower the firing temperature, shorten drying time, and increase firing strength. When used in glazes, it can increase the mechanical strength and thermal stability of the glaze layer, improve glaze whiteness, reduce glaze defects, and make the ceramics flawless.

[0033] 2. Bauxite clinker undergoes a change in composition during high-temperature calcination, transforming kaolinite and diaspore into mullite, which enhances the chemical stability and physical strength of the green body.

[0034] 3. Purple comb clay is composed of fine kaolinite particles interspersed with micro-quartz particles. It contains: silicon 33.9%, aluminum 29%, iron 1.15%, titanium 0.56%, calcium 3.57%, magnesium 0.54%, potassium 0.93%, sodium 0.61%, and a relatively large amount of carbonaceous humus. It has a large firing shrinkage rate. Because the organic matter it contains can hydrolyze with alkali to form a protective colloid, it helps to improve the molding performance of the clay. Therefore, it is an ideal clay raw material for preparing ceramic slurry. In addition, porcelain powder has already vitrified and lacks stickiness. The addition of purple comb clay can effectively enhance the bonding between porcelain powder and other raw materials.

[0035] 4. Porcelain Fragment Powder: Ceramic raw materials undergo chemical reactions during reduction firing, forming porous aluminosilicates. Grinding them into powder prevents further chemical reactions during reuse. The porous structure of the waste porcelain powder minimizes and rapidly releases gases generated when carbon dioxide and water are emitted from the ceramic body, reducing void formation and acting as a catalyst and carrier. This improves product quality and performance, increases the hardness and heat resistance of the ceramic body, making it more durable and aesthetically pleasing.

[0036] 5. The main components of Yanhedian crucible clay are: silicon 69%, aluminum 19%, iron 1.13%, titanium 0.97%, calcium 0.2%, magnesium 0.27%, potassium 4.58%, sodium 0.18%, and loss on ignition 6.9%. It belongs to high-silicon, low-alumina clay, which can prevent precipitation, increase plasticity slightly, and increase the whiteness of the glaze.

[0037] 6. Xixia Rutile: The ore is composed of quartz talc schist, tremolite, and biotite hornblende plagioclase gneiss. Its main components are: silicon 13.8%, iron 3%, potassium 6.6%, titanium 60%, calcium 13.8%, and loss on ignition 2.8%. Titanium dioxide turns yellow when fired in an oxidizing atmosphere, but becomes an unstable gray when fired in a reducing atmosphere. The high-temperature formation of a glassy phase by calcium and silicon lowers the glaze's maturation temperature and high-temperature viscosity, increases its high-temperature fluidity, and makes the glaze glossy and transparent. Under reducing atmosphere firing conditions, it enhances the coloring of iron oxide.

[0038] 7. White feldspar mainly contains: silicon 68.8%, aluminum 18.9%; iron 0.39%, potassium 4.59%, sodium 6.6%, titanium 0.05%, titanium 0.51%, and magnesium 0.17%. The high content of potassium and sodium acts as a flux in the glaze and is the main component in forming the glass phase. It has a wide melting range and a large high-temperature viscosity, which can broaden the melting and maturation temperature range of the glaze, which is beneficial to porcelain formation and lowering the firing temperature. It can also improve the gloss, transparency and smoothness of the glaze, improve the chemical stability of the glaze, and enhance the grade and quality of the product.

[0039] In summary, the Ru porcelain produced using the process of this invention has a bluish-green glaze that is vibrant and lustrous, with a uniform glaze layer and a strong vitreous texture. The deeper the glaze, the more vibrant the green, while the lighter the glaze, the more like the color of fresh green beans. This not only improves efficiency, reduces costs, and enhances product quality, but also strengthens market competitiveness, thereby better meeting market demands. Detailed Implementation

[0040] A celadon-glazed porcelain and its preparation method, comprising the preparation of the body and the glaze, specifically:

[0041] I. Preparation of green body

[0042] The body is composed of the following components in parts by weight: 25-50 parts of pyrophyllite, 15-50 parts of calcined bauxite, 30-70 parts of purple clay, and 15-40 parts of waste porcelain powder.

[0043] Step 1: First, crush the ceramic fragments into powder and pass them through a 30-mesh sieve. Then, put the bauxite into a kiln and calcine it at 900℃~950℃ for later use.

[0044] Step 2: Calculate by weight parts and take 25-50 parts of Lingtou pyrophyllite, 15-50 parts of calcined bauxite, 30-70 parts of purple comb clay, and 15-40 parts of waste porcelain powder, which have been sorted, bleached, and crushed. Put them into a wet ball mill and ball mill them at a weight ratio of 1-1.5:1.5-1:1.5-1 for 13-17 hours. After ball milling, filter the slurry through 60-100 mesh and 90-110 mesh vibrating screens, and then remove iron through a permanent magnet iron remover and a high-strength electromagnetic iron remover. The filtration and iron removal should be repeated three times to obtain mud.

[0045] Step 3: Filter the mud obtained in Step 2 to remove water, forming mud cakes, and pack them into bags for later use.

[0046] Step 4: Vacuum the clay cake obtained in Step 3 using a clay mixing machine, and store it in sections to obtain clay strips;

[0047] Step 5: Adjust the mud concentration of Step 2 to 50-56 degrees and pour it into the plaster mold. When the mud has solidified to a certain thickness, pour out the excess mud. After 24 hours, open the mold, take out the clay blank, let it cool for 4 hours, and then glue the accessories together. Smooth out the excess mud at the glued area, let it dry naturally, then grind the blank seams, refine it, polish the blank, and carve it to obtain the body.

[0048] Step 6: Using the clay strips obtained in Step 4, shape them by hand-throwing on a potter's wheel. After being left to rest naturally in a sheltered place for 3 days, refine, polish, and carve to obtain the blank.

[0049] Step 7: After thoroughly air-drying the body obtained in Step 5, place it in a rapid firing drawer kiln and heat it for 5.5 to 6.5 hours until the temperature reaches 850 to 950°C. Then stop the fire and cool down to obtain the unglazed body. Polish, trim, refine, and remove dust from the unglazed body again before use.

[0050] II. Glaze Preparation:

[0051] Calculated by mass fractions, 20-60 parts of Yanhedian crucible clay, 20-60 parts of purple comb clay, 20-60 parts of Xixia rutile ore, and 15-60 parts of Lingtou feldspar are put into a wet ball mill and ball-milled at a weight ratio of 1-1:1-0.5:1.5-0.5 for 14-15 hours to obtain a glaze with a fineness of 0.5-0.7. The slurry is discharged through a 60-100 mesh sieve, then filtered through a 90-110 mesh vibrating sieve, and finally iron is removed from the filtered slurry by an iron magnet to obtain the glaze slurry.

[0052] III. Glazing:

[0053] Wipe the unglazed body evenly with a damp sponge, apply glaze, and gently wipe away the excess glaze with a brush, polishing cotton, or other tools. After fine finishing, the glazed body is obtained.

[0054] IV. Firing:

[0055] The glazed body is then fired, and the firing process includes the following stages:

[0056] Preheating stage: Aerobic firing is carried out at a temperature of 150-300℃ for 1.5-2.5 hours;

[0057] Oxidation stage: Aerobic firing is carried out at a temperature of 300-950℃ for 4-6 hours;

[0058] Weak reduction stage: When the temperature is 900-1000℃, close the gate two-thirds, control the oxygen content at 0.6-1.2%, the carbon monoxide content at 1-3%, the firing time at 1-1.5h, and the temperature at 1000-1100℃.

[0059] Strong reduction stage: close the gate at a temperature of 1000-1080℃, control the oxygen content to be 0.1-1%, the carbon monoxide content to be 5.5-10%, the firing time to be 40-60 minutes, and the temperature to be raised to 1100-1200℃;

[0060] Insulation stage: Insulation is carried out at a temperature of 1100-1200℃ for 60-90 minutes;

[0061] Cooling stage: Stop the fire, open the gate to cool down naturally, and then take it out to get celadon glazed porcelain.

[0062] Example 1

[0063] A method for preparing celadon-glazed Ru porcelain includes the following steps:

[0064] I. Preparation of green body:

[0065] Step 1: First, crush the ceramic fragments into powder and pass them through a 30-mesh sieve. Then, put the bauxite into a kiln and calcine it at 900℃~950℃ for later use.

[0066] Step 2: Calculate by mass fraction, and put 25 parts of the selected and bleached Lingtou pyrophyllite, 20 parts of calcined bauxite, 35 parts of purple comb clay, and 15 parts of waste porcelain powder into a wet ball mill. Ball milling is carried out at a mass ratio of raw materials, grinding balls, and water of 1:1.5:1.5 for 14 hours. The resulting slurry is filtered through 800-mesh and 100-mesh vibrating screens, and then iron is removed by a permanent magnet iron remover and a high-strength electromagnetic iron remover. The filtration and iron removal are repeated three times.

[0067] Step 3: Adjust the mud concentration from Step 2 to 54°be′ and pour it into the plaster mold. Water seeps into the plaster model through the contact surface, forming a hard layer on the surface. Once the hard layer reaches a certain thickness, 0.8–1.5 cm, pour out the excess mud. After the blank has hardened slightly, open the mold and let it cool for 4 hours. Then, remove the excess grouting holes and bond the accessories. Smooth out any excess mud at the bonding points and let it air dry naturally. After that, grind the seams, refine, carve, and polish the blank to obtain the body.

[0068] Step 4: After thoroughly air-drying the body obtained in Step 3, place it in a rapid firing drawer kiln. After 6 hours of heating, raise the temperature to 900℃, then stop the fire and cool down to obtain the unglazed body. Polish, trim, refine, and remove dust from the unglazed body again before use.

[0069] II. Glaze Preparation:

[0070] Calculate the following by weight: 23 parts Yanhedian crucible clay, 28 parts purple comb clay, 30 parts Xixia rutile ore, and 19 parts Lingtou white feldspar. Put them into a wet ball mill and ball mill them at a mass ratio of 1:0.5:1 for 14 hours to obtain a glaze with a fineness of 0.5. The glaze is then discharged through an 80-mesh sieve and filtered through a 100-mesh vibrating sieve. Finally, the filtered slurry is repeatedly subjected to an iron magnet to remove iron three times to obtain the glaze slurry.

[0071] III. Glazing:

[0072] Adjust the glaze to 58°be′, wipe the unglazed body evenly with a damp sponge, apply water to the carved areas with a brush, apply glaze using the dip glaze method, and then gently wipe away the excess glaze with tools such as a rubbing cotton. After fine finishing and smoothing, the glazed body is obtained.

[0073] IV. Firing:

[0074] The glazed body is then fired, and the firing process includes the following stages:

[0075] Preheating and dehumidification stage: aerobic firing is carried out before the temperature reaches 300℃, and the firing time is 2 hours. This stage is mainly used for preheating the green body and removing residual moisture from the green body.

[0076] Oxidation stage: Aerobic firing is carried out at a temperature of 300-900℃ for 5 hours; the main physical and chemical changes of ceramic body and glaze are carried out, including weight reduction, strength reduction, removal of crystal water, oxidation of organic matter and sulfides, decomposition of carbonates, and transformation of quartz crystal form.

[0077] Weak reduction stage: At a temperature of 950℃, the gate is closed two-thirds of the way, the oxygen content is controlled at 0.7%, the carbon monoxide content at 2%, the firing time is 1.5 hours, and the temperature is raised to 1020℃; the body begins to show a liquid phase, the glaze begins to melt, and various components begin to be reduced, but the reduction is not very complete, and there will be color difference in the glaze color.

[0078] Strong reduction stage: Close the gate at 1020℃, control the oxygen content to 0.7% and the carbon monoxide content to 6%, fire for 50 minutes, and raise the temperature to 1100℃; this stage is a supplement to the weak reduction stage, making the glaze color uniform and natural.

[0079] Insulation stage: Insulation is carried out at a temperature of 1100℃~1200℃ for 70 minutes; the main purpose is to reduce the temperature difference between different parts, the surface and interior of the same part;

[0080] Cooling stage: Stop the fire, open the gate to cool down naturally. During the cooling process, the liquid phase solidifies, the quartz crystal form transforms, and the body gradually solidifies. After the kiln temperature drops to room temperature, take it out to obtain celadon glaze porcelain.

[0081] Example 2

[0082] A method for preparing celadon-glazed Ru porcelain includes the following steps:

[0083] I. Preparation of green body:

[0084] Step 1: Crush the ceramic fragments into powder and pass them through a 30-mesh sieve. Then, calcine the bauxite in a kiln at 900℃~950℃ for later use.

[0085] Step 2: Take 30 parts of Lingtou pyrophyllite, 15 parts of calcined bauxite, 30 parts of purple comb clay, and 25 parts of waste porcelain powder after sorting, bleaching, and crushing, and put them into a wet ball mill. The mass ratio of raw materials, grinding balls, and water is 1:1.5:1.5. The ball milling time is 14 hours. The slurry is filtered through 800-mesh and 100-mesh vibrating screens, and then iron is removed by a permanent magnet iron remover and a high-strength electromagnetic iron remover. The filtration and iron removal are repeated three times.

[0086] Step 3: Filter the mud obtained in Step 2 to remove water and form mud cake;

[0087] Step 4: Vacuum the clay cake obtained in Step 3 using a clay mixing machine, and store it in sections to obtain clay strips;

[0088] Step 5: Shape the clay strips obtained in Step 4 using conventional wheel throwing methods. After placing them in a sheltered place for 3 days, refine, carve, polish, and air dry to obtain the blank body.

[0089] Step 6: After thoroughly air-drying the body obtained in Step 5, place it in a rapid firing drawer kiln. After 6 hours of heating to 900℃, stop the fire and cool down to obtain the unglazed body. Then, polish, trim, refine, and remove dust from the unglazed body for later use.

[0090] II. Glaze Preparation:

[0091] Calculate the following by weight: 30 parts Yanhedian crucible clay, 32 parts purple comb clay, 23 parts Xixia rutile ore, and 15 parts Lingtou white feldspar. Put them into a wet ball mill and ball mill them according to the mass ratio of raw materials, grinding balls, and water. The ball milling time is 14 hours to obtain a glaze with a fineness of 0.5. Pass the glaze through an 80-mesh sieve to discharge the slurry, then filter it through a 100-mesh vibrating sieve. Then, use a magnet to repeatedly remove iron from the filtered slurry three times to obtain the glaze slurry.

[0092] III. Glazing:

[0093] Adjust the glaze to 58°be′, wipe the unglazed body obtained in step 7 evenly with a damp sponge, apply water to the carved areas with a brush, apply glaze using the immersion glaze method, and then gently wipe away the excess glaze with tools such as a rubbing cotton. After fine trimming and smoothing, the glazed body is obtained.

[0094] IV. Firing:

[0095] The glazed body is then fired, and the firing process includes the following stages:

[0096] Preheating and dehumidification stage: aerobic firing is carried out before the temperature reaches 300℃, and the firing time is 2 hours. This stage is mainly used for preheating the green body and removing residual moisture from the green body.

[0097] Oxidation stage: Aerobic firing is carried out at a temperature of 300-900℃ for 5 hours; the main physical and chemical changes of ceramic body and glaze are carried out, including weight reduction, strength reduction, removal of crystal water, oxidation of organic matter and sulfides, decomposition of carbonates, and transformation of quartz crystal form.

[0098] Weak reduction stage: At a temperature of 950℃, the gate is closed two-thirds of the way, the oxygen content is controlled at 0.7%, the carbon monoxide content at 2%, the firing time is 1.5 hours, and the temperature is raised to 1020℃; the body begins to show a liquid phase, the glaze begins to melt, and various components begin to be reduced, but the reduction is not very complete, and there will be color difference in the glaze color.

[0099] Strong reduction stage: Close the gate at 1020℃, control the oxygen content to 0.7% and the carbon monoxide content to 6%, fire for 50 minutes, and raise the temperature to 1100℃; this stage is a supplement to the weak reduction stage, making the glaze color uniform and natural.

[0100] Insulation stage: Insulation is carried out at a temperature of 1100℃~1200℃ for 70 minutes; the main purpose is to reduce the temperature difference between different parts, the surface and interior of the same part;

[0101] Cooling stage: Stop the fire, open the gate to cool down naturally. During the cooling process, the liquid phase solidifies, the quartz crystal form transforms, and the body gradually solidifies. After the kiln temperature drops to room temperature, take it out to obtain celadon glaze porcelain.

[0102] In the above embodiments, the composition within the specified range of raw material content can achieve the effect of celadon glaze. The difference lies in the forming process, the depth of the body color, and the depth of the glaze color. In Example 1, a mold casting method was used, resulting in a light gray body, a dark green glaze with a yellowish tinge, and a light and soft glaze surface.

[0103] In Example 2, the body was formed by hand-throwing, and the glaze was light gray with a yellowish tinge and a jade-like luster.

[0104] The successful development and production of this celadon-glazed Ru porcelain represents a restoration of a particular glaze color from the Ru kiln. It not only saves energy but also produces excellent artistic effects, which are loved by people from all walks of life, resulting in significant economic and social benefits.

[0105] The foregoing has shown and described the main features, usage methods, basic principles, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention based on actual circumstances without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing celadon-glazed Ru porcelain, comprising the following steps: I. Preparation of green body: Step 1: Crush the ceramic fragments into powder and pass them through a 30-mesh sieve. Then, calcine the bauxite in a kiln at 900℃~950℃ for later use. Step 2: Take 30 parts of Lingtou pyrophyllite, 15 parts of calcined bauxite, 30 parts of purple comb clay, and 25 parts of waste porcelain powder after sorting, bleaching, and crushing, and put them into a wet ball mill. Ball milling is carried out at a mass ratio of raw materials, grinding balls, and water of 1:1.5:1.5 for 14 hours. The slurry is filtered through 800-mesh and 100-mesh vibrating screens, and then iron is removed by a permanent magnet iron remover and a high-strength electromagnetic iron remover. The filtration and iron removal are repeated three times. Step 3: Filter the mud obtained in Step 2 to remove water and form mud cake; Step 4: Vacuum the clay cake obtained in Step 3 using a clay mixing machine, and store it in sections to obtain clay strips; Step 5: Shape the clay strips obtained in Step 4 using conventional wheel throwing methods. After placing them in a sheltered place for 3 days, refine, carve, polish, and air dry to obtain the blank body. Step 6: After thoroughly air-drying the blank obtained in Step 5, place it in a rapid firing drawer kiln. After 6 hours of heating, the temperature is raised to 900℃, then the kiln is stopped and the temperature is lowered to obtain the unglazed body. The unglazed body is then polished, trimmed, refined, and dusted again before being put into use. II. Glaze Preparation: Calculate the following by weight: 30 parts Yanhedian crucible clay, 32 parts purple comb clay, 23 parts Xixia rutile ore, and 15 parts Lingtou white feldspar. Put them into a wet ball mill and ball mill the raw materials, grinding balls, and water for 14 hours to obtain a glaze with a fineness of 0.

5. Pass the glaze through an 80-mesh sieve to discharge the slurry, then filter it through a 100-mesh vibrating sieve. Then, use a magnet to repeatedly remove iron from the filtered slurry three times to obtain the glaze slurry. III. Glazing: Adjust the glaze to 58°be′, wipe the unglazed body obtained in step six evenly with a wet sponge, apply water to the carved area with a brush, apply glaze using the immersion glaze method, and then gently wipe away the excess glaze with a rubbing cotton. After fine repair and smoothing, the glazed body is obtained. IV. Firing: The glazed body is then fired, and the firing process includes the following stages: Preheating and dehumidification stage: Aerobic firing is carried out before the temperature reaches 300℃, and the firing time is 2 hours; Oxidation stage: Aerobic firing is carried out at a temperature of 300-900℃ for 5 hours; Weak reduction stage: At a temperature of 950℃, the gate is closed two-thirds of the way, the oxygen content is controlled at 0.7%, the carbon monoxide content is controlled at 2%, the firing time is 1.5h, and the temperature is raised to 1020℃. Strong reduction stage: close the gate at a temperature of 1020℃, control the oxygen content to 0.7%, the carbon monoxide content to 6%, the firing time to 50 minutes, and raise the temperature to 1100℃. Insulation stage: Insulate at 1100℃~1200℃ for 70 minutes; Cooling stage: Stop the fire, open the gate to cool down naturally. During the cooling process, the liquid phase solidifies, the quartz crystal form transforms, and the body gradually solidifies. After the kiln temperature drops to room temperature, take it out to obtain celadon glaze porcelain.