Ceramics prepared from waste materials and environmentally friendly materials and a preparation process thereof

Abstract

The present application relates to the field of ceramic and its preparation process, in particular to a kind of ceramic and its preparation process prepared by using waste material and environmental protection material, green body includes outer green layer and inner green layer, the raw material of outer green layer includes outer green material, the raw material of outer green material includes the following components: calcined kaolin, clay, feldspar, acrylic, bentonite, limestone, the raw material of inner green layer includes the following components: mud, stone, sand, glass fragments, plant stems, shell fragments, porcelain fragments.Organic material in green body is burnt and decomposed completely in the process of firing, the shape and texture before firing are left on the outer surface of green body, with staggered horizontal texture, pit and texture, the inner wall of green body is fused with the complex texture formed after the firing of stone, sand, glass and shell, similar to the effect of beach landform, with unique artistic aesthetic feeling.

Description

Technical Field

[0001] The present invention relates to the field of ceramics and preparation processes thereof, and in particular to ceramics prepared by utilizing waste materials and environmentally friendly materials and preparation processes thereof. Background Art

[0002] Organic materials are used as additives to the green body. When added to the green body slurry, pores can be formed after firing and fine texture can be formed on the surface of the green body, thus forming a green body with a fossil texture. The existing method of preparing green bodies using organic matter as green body additives usually involves crushing the organic material and uniformly mixing it with other components of the green body. This method has high requirements on the particle size fineness of the organic matter and the uniformity of mixing with other components. Otherwise, the green body is prone to cracking during the drying process. Therefore, when different organic matter with large particles and other raw materials are combined, especially when waste glass, porcelain fragments, shells, etc. are used as raw materials, the green body is prone to cracking. Due to this limitation, the surface texture of the green body with a fossil texture is relatively simple, and since multiple raw materials are added to the green body, the green body is thicker and is prone to cracking during the drying stage. In view of this, this case arises. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems by using ceramics prepared from waste materials and environmentally friendly materials and a preparation process thereof.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows: a ceramic prepared from waste materials and environmentally friendly materials includes a green body, the green body includes an outer green body layer and an inner green body layer, the raw materials of the outer green body layer include an outer green body, and the raw materials of the outer green body include the following components in parts by weight: 20-25 parts of calcined kaolin, 30-35 parts of clay, 15-18 parts of feldspar, 5-8 parts of acrylic fiber, 7-9 parts of bentonite, and 6-9 parts of limestone; the raw materials of the inner green body layer include an inner green body, and the raw materials of the inner green body include the following components in parts by weight: 60-65 parts of mud, 5-7 parts of stone, 6-8 parts of sand, 7-9 parts of glass fragments, 4-6 parts of plant stems, 4-6 parts of shell fragments, and 4-6 parts of porcelain fragments.

[0005] Preferably, the raw materials of the slurry include the following components in parts by weight: 20-25 parts of calcined kaolin, 30-35 parts of clay, 10-15 parts of cotton fiber, and 8-10 parts of pulp.

[0006] Preferably, the outer surface of the blank is locally sprayed with wood ash glaze and moss glaze in sequence: the raw materials of the wood ash glaze, calculated in parts by weight, include the following components: 30-35 parts of kaolin, 20-25 parts of wollastonite, 20-25 parts of silicon dioxide, 5-8 parts of rutile, and 6-8 parts of wood ash; the raw materials of the moss glaze, calculated in parts by weight, include the following components: 35-40 parts of nepheline orthoclase, 25-28 parts of kaolin, 15-18 parts of strontium carbonate, 7-9 parts of ball clay, 9-12 parts of silicon dioxide, 2-5 parts of lithium carbonate, 8-10 parts of copper carbonate, and 3-5 parts of titanium dioxide.

[0007] Preferably, the inner surface of the blank is partially sprayed with turquoise glaze, and the raw materials of the turquoise glaze include the following components in parts by weight: 15-18 parts of kaolin, 25-30 parts of silicon dioxide, 20-25 parts of borate, 20-25 parts of lithium carbonate, 10-12 parts of feldspar, 5-8 parts of ball clay, and 2-3 parts of cobalt carbonate.

[0008] The preparation process of ceramics prepared by using waste materials and environmentally friendly materials includes the following steps:

[0009] Step a, weaving the skeleton;

[0010] Step b, applying the blank on the inner and outer surfaces of the skeleton to obtain a blank;

[0011] Step c, drying the green body;

[0012] Step d, the green body is put into the kiln for bisque firing;

[0013] Step e, spraying glaze on the surface of the bisque-fired body;

[0014] Step f, placing in kiln for glaze firing.

[0015] Preferably, it is characterized in that: in the step a, the skeleton is woven by bamboo strips, and the bamboo strips are woven by warp and weft or tied with hemp ropes to be shaped.

[0016] Preferably, in step b, the process of applying the blank to the outer surface of the skeleton is as follows: first apply a layer of outer blank, then cover it with a layer of wool cloth soaked with the outer blank, and then apply another layer of outer blank; the process of applying the blank to the inner surface of the skeleton is as follows: first apply a layer of mud, then spread a layer of sand in the mud, then add plant stems, then spread another layer of mud, and finally place stones, glass fragments, shell fragments and porcelain fragments.

[0017] Preferably, in the step d, the first biscuit firing is carried out in an outdoor kiln at a firing temperature of 800 degrees Celsius. After the blank is taken out of the kiln, the ash on the surface of the blank is removed, and then the second biscuit firing is carried out in an indoor kiln at a firing temperature of 1100 degrees Celsius.

[0018] Preferably, in step f, the firing temperature of the glaze firing is 1150-1200 degrees Celsius.

[0019] Preferably, in step c, the green body enters a humidity drying furnace for drying;

[0020] The humidity drying furnace includes a furnace cavity, an air intake duct, a waste heat intake duct, an exhaust duct, a bypass air duct, and a heating and humidification channel. The furnace cavity is divided into multiple drying chambers, and a side circulation channel is formed between the outermost drying chamber and the inner wall of the furnace cavity. A lower circulation channel is provided at the bottom of the drying chamber and an upper circulation channel is provided at the top. The reflux port at the bottom of the drying chamber is connected to the side circulation channel through the lower circulation channel, and the top of the side circulation channel is connected to the upper circulation channel. A circulation fan is provided above each drying chamber, and an auxiliary burner is provided in the side circulation channel. The air intake duct The waste heat inlet duct is connected to the air inlet end of the heating and humidifying channel, the exhaust end of the heating and humidifying channel is connected to the upper circulation channel, and the interior of the heating and humidifying channel is provided with a humidifying nozzle, an air intake fan, an air intake filter and a main burner in sequence from the air intake end to the exhaust end. The bottom of the exhaust duct is connected to the lower circulation channel, and the middle part is connected to the air inlet end of the heating and humidifying channel through a bypass air duct. Valves are provided on the air inlet duct, the waste heat inlet duct, the exhaust duct and the bypass air duct for adjusting the air intake amount of each channel, and a temperature sensor and a humidity sensor are provided inside the furnace cavity;

[0021] The air inlet duct is used to introduce external air, and the waste heat inlet duct is used to introduce air with waste heat from the production kiln. After the air is pressurized by the air intake fan in the heating and humidification channel, it is heated by the main burner and then enters the upper circulation channel. The circulation fan introduces the hot air into the drying chamber to dry the green body in the drying chamber. After that, the air passes through the reflux port at the bottom of the drying chamber, the lower circulation channel, and the side circulation channel in turn, and flows back to the upper circulation channel, thereby forming a circulating heating and drying of the hot air. Part of the air enters the exhaust duct from the lower circulation channel and is discharged.

[0022] From the above description, it can be seen that the ceramics prepared using waste materials and environmentally friendly materials and the preparation process thereof provided by the present invention have the following beneficial effects: the organic materials in the green body are burned and decomposed during the firing process, and the shape and texture before firing remain on the outer surface of the green body, with crisscrossing textures, pits and textures. The inner wall of the green body integrates the complex texture formed after firing of stones, sand, glass and shells, resembling the effect of beach landform, with unique artistic beauty; the green body is supported by bamboo strips as the skeleton, and the bamboo strips have high toughness to support the thicker inner and outer green layers; after glaze firing, a local glaze effect with a black-gray background color, green stripes, and the shape of moss is formed on the outer surface; a local turquoise glaze effect is formed on the inner surface; the green body is dried at high humidity and high temperature to prevent the thicker green body from cracking during the drying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the humidity drying furnace of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described below through specific embodiments.

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] As shown in the figure, the ceramics prepared by using waste materials and environmentally friendly materials in the present invention include a green body, which includes an outer green body layer and an inner green body layer. The raw materials of the outer green body layer include outer green body, and the raw materials of the outer green body include the following components in parts by weight: 20-25 parts of calcined kaolin, 30-35 parts of clay, 15-18 parts of feldspar, 5-8 parts of acrylic fiber, 7-9 parts of bentonite, and 6-9 parts of limestone. The raw materials of the inner green body layer include inner green body, and the raw materials of the inner green body include the following components in parts by weight: 60-65 parts of mud, 5-7 parts of stone, 6-8 parts of sand, 7-9 parts of glass fragments, 4-6 parts of plant stems, 4-6 parts of shell fragments, and 4-6 parts of porcelain fragments. The organic materials in the blank are burned and decomposed during the firing process, leaving the shape and texture before firing on the outer surface of the blank, with crisscrossing textures, pits and lines. The inner wall of the blank incorporates the complex texture formed after firing of stones, sand, glass and shells, resembling the effect of beach landform, with unique artistic beauty.

[0027] The raw materials for the mud, measured in parts by weight, include the following: 20-25 parts calcined kaolin, 30-35 parts clay, 10-15 parts cotton fiber, and 8-10 parts paper pulp. The cotton fiber and paper pulp in the mud effectively enhance its cohesiveness, providing excellent adhesion to large, irregularly sized additives such as shell fragments, porcelain shards, and glass fragments in the blank, preventing cracking. The mud also decomposes organic matter during calcination, increases porosity, and facilitates moisture expulsion, making it less prone to cracking during drying and calcination.

[0028] The outer surface of the body is sprayed with wood ash glaze and moss glaze in sequence. The wood ash glaze comprises, by weight, 30-35 parts kaolin, 20-25 parts wollastonite, 20-25 parts silica, 5-8 parts rutile, and 6-8 parts wood ash. The moss glaze comprises, by weight, 35-40 parts nepheline orthoclase, 25-28 parts kaolin, 15-18 parts strontium carbonate, 7-9 parts ball clay, 9-12 parts silica, 2-5 parts lithium carbonate, 8-10 parts copper carbonate, and 3-5 parts titanium dioxide. The wood ash glaze and moss glaze are applied to the outer surface of the body. The wood ash glaze provides a dark gray base color, while the moss glaze is green. The two complement each other, creating a gray-green blend that blends seamlessly with the delicate texture of the outer surface, creating a mottled effect resembling moss.

[0029] The inner surface of the body is partially sprayed with turquoise glaze. The raw materials for this turquoise glaze, calculated by weight, include the following: 15-18 parts kaolin, 25-30 parts silica, 20-25 parts borate, 20-25 parts lithium carbonate, 10-12 parts feldspar, 5-8 parts ball clay, and 2-3 parts cobalt carbonate. After firing, the turquoise glaze creates a turquoise-colored finish that complements the texture and color of the inner cortex, further enriching its color.

[0030] The preparation process of ceramics prepared by using waste materials and environmentally friendly materials includes the following steps:

[0031] Step a, weaving the skeleton;

[0032] Step b, applying the blank on the inner and outer surfaces of the skeleton to obtain a blank;

[0033] Step c, drying the green body;

[0034] Step d, the green body is put into the kiln for bisque firing;

[0035] Step e, spraying glaze on the surface of the bisque-fired body;

[0036] Step f, placing in kiln for glaze firing.

[0037] In step a, the framework is woven from bamboo strips, which are woven in warp and weft or tied with hemp rope to form a fixed shape. The blank is supported by the bamboo strips, and the inner and outer blanks are covered on the inside and outside. The bamboo strips have high toughness to support the thicker inner and outer blank layers.

[0038] In step b, the process of applying the blank to the outer surface of the skeleton is as follows: first apply a layer of outer blank, then cover it with a layer of wool cloth soaked with the outer blank, and then apply another layer of outer blank; the process of applying the blank to the inner surface of the skeleton is as follows: first apply a layer of mud, then spread a layer of sand in the mud, then add plant stems, and then spread another layer of mud, and finally embed stones, glass fragments, shell fragments and porcelain fragments into the mud. The mud is used to bond various raw materials together, and the stones, glass fragments, shell fragments and porcelain fragments are selected to have a particle size of less than 5 mm.

[0039] In step d, the first biscuit firing is carried out in an outdoor kiln at a firing temperature of 800 degrees Celsius. After the green body is taken out of the kiln, the ash on the surface of the green body is removed, and then the second biscuit firing is carried out in an indoor kiln at a firing temperature of 1100 degrees Celsius. The organic matter in the green body is completely decomposed by the two biscuit firings. Since the green body contains a large amount of organic matter, a large amount of smoke will be generated during the biscuit firing process. Therefore, the first biscuit firing is carried out in an outdoor kiln. During the biscuit firing process, various raw materials inside the green body are melted, decomposed, and bonded together. The mud serves as a binder for the various raw materials. After firing, the various raw materials inside the green body retain some of their original characteristics and textures. For example, the stone and sand are partially dissolved, but they can still show their original colors and outlines after firing. Glass fragments, shells and porcelain fragments are dissolved and merged with other raw materials to present local colored spots. The plant stems burn and decompose, leaving traces of plant burning on the green body. The overall color and texture are extremely rich.

[0040] In step f, the glaze is fired at a temperature of 1150-1200 degrees Celsius. After glaze firing, a partial moss-like glaze effect with a dark gray base and green stripes is formed on the outer surface, and a partial turquoise glaze effect is formed on the inner surface.

[0041] In step c, the green body enters a humidity drying furnace for drying;

[0042] like Figure 1The humidity drying furnace includes a furnace cavity, an air inlet duct 1, a waste heat inlet duct 2, an exhaust duct 3, a bypass air duct 4, a heating and humidifying channel 5, and the furnace cavity is divided into multiple drying chambers 6. A side circulation channel 7 is formed between the outermost drying chamber 6 and the inner wall of the furnace cavity. A lower circulation channel 8 is provided at the bottom of the drying chamber 6 and an upper circulation channel 9 is provided at the top. The reflux port at the bottom of the drying chamber 6 is connected to the side circulation channel 7 through the lower circulation channel 8, and the top of the side circulation channel 7 is connected to the upper circulation channel 9. A circulation fan 10 is provided above each drying chamber 6, and an auxiliary burner 11 is provided in the side circulation channel 7. The air intake The duct 1 and the waste heat inlet duct 2 are connected to the air inlet end of the heating and humidifying channel 5, and the exhaust end of the heating and humidifying channel 5 is connected to the upper circulation channel 9. The interior of the heating and humidifying channel 5 is provided with a humidifying nozzle 12, an air intake fan 13, an air intake filter and a main burner 14 in sequence from the air intake end to the exhaust end. The bottom of the exhaust duct 3 is connected to the lower circulation channel 8, and the middle part is connected to the air inlet end of the heating and humidifying channel 5 through the bypass air duct 4. Valves are provided on the air inlet duct 1, the waste heat inlet duct 2, the exhaust duct 3 and the bypass air duct 4 to adjust the air intake amount of each channel. A temperature sensor and a humidity sensor are provided inside the furnace cavity.

[0043] The air inlet duct 1 is used to introduce external air, and the waste heat inlet duct 2 is used to introduce air with waste heat from the production kiln. After the air is pressurized by the air intake fan 13 in the heating and humidifying channel 5, it is heated by the main burner 14 and then enters the upper circulation channel 9. The circulation fan 10 introduces the hot air into the drying chamber 6 to dry the green bodies in the drying chamber 6. After that, the air passes through the return port at the bottom of the drying chamber 6, the lower circulation channel 8, and the side circulation channel 7 in sequence, and flows back to the upper circulation channel 9, thereby forming a circulating heating and drying of the hot air. Part of the air enters the exhaust duct 3 from the lower circulation channel 8 and is discharged;

[0044] In the early stage of drying the green body, the humidity inside the furnace cavity is low. The air in the heating and humidifying channel 5 is humidified by the humidifying nozzle 12 to quickly increase the humidity in the furnace cavity and avoid cracking of the green body caused by too low humidity of the air in the early stage of drying. At the same time, the main burner 14 and the auxiliary burner 11 are synchronously turned on to quickly increase the temperature in the furnace cavity, and the valve opening of the waste heat intake duct 2 is increased to increase the temperature of the intake air. While increasing the heating rate, the energy utilization rate is improved, the valve opening of the air intake duct 1 is reduced or closed, and waste heat air or internal circulating air is used as much as possible for intake. The valve opening of the bypass air duct 4 is increased, and the exhaust is reduced, so that the waste heat air in the exhaust duct 3 flows back into the furnace cavity to increase the waste heat utilization rate, and the humidity in the exhaust is used to quickly increase the humidity in the furnace cavity;

[0045] After the humidity and temperature of the air inlet of the drying chamber 6 are raised to the initial set values, the humidifying nozzle 12, the main burner 14 and the auxiliary burner 11 work intermittently, and the valve opening of each air channel is electronically adjusted to make the humidity of the air inlet of the drying chamber 6 decrease according to the set curve within the set temperature range. The set temperature range of the air inlet temperature of the drying chamber 6 is 50-60 degrees Celsius, and the initial set value of the air inlet humidity of the drying chamber 6 is 80-90% relative humidity. In the early stage of drying, the green body is in a high temperature and high humidity environment, only heating up without dehydration, to prevent drying cracks, air The air flow rate is controlled at 3-4m / s and lasts for 1-2 hours. In the middle and late stages of drying, the air inlet temperature of the drying chamber 6 is maintained at 50-60 degrees Celsius, and the air flow rate is controlled at 4-5m / s. During the drying process of the green body, water vapor expands into the air, causing the humidity in the furnace chamber to rise rapidly. The valve opening of the bypass air duct 4 is reduced to reduce the backflow of high-humidity air, and the exhaust opening is increased. The humidity in the furnace chamber gradually decreases in the middle and late stages of drying. At the end of drying, the air inlet humidity of the drying chamber 6 is 3-4%. The middle and late stages of drying are 8-10 hours. Since the blank in the present invention uses bamboo weaving as the skeleton and the inner wall of the blank is integrated with stones, sand, glass and shells, the blank has many pores and a fragile structure. If ordinary drying methods are used, the blank is prone to cracking. Therefore, it is necessary to adopt a high-humidity and high-temperature drying method to avoid cracking of the blank. The initial humidity is quickly increased by a humidifier, and the internal air flow rate is increased through a circulation channel to increase the drying speed. High humidity is maintained in the early and middle stages of drying, so that the thicker parts of the blank are not easy to crack.

[0046] The above are only some specific implementation methods of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A process for preparing ceramics using waste materials and environmentally friendly materials, characterized in that: The steps include: Step a, weaving the skeleton; Step b, applying the blank on the inner and outer surfaces of the skeleton to obtain a blank; Step c, drying the green body; Step d, the green body is put into the kiln for bisque firing; Step e, spraying glaze on the surface of the bisque-fired body; Step f, placing in kiln for glaze firing; In the step b, the body includes an outer blank layer and an inner blank layer, the raw materials of the outer blank layer include an outer blank, and the raw materials of the outer blank include the following components in parts by weight: 20-25 parts of calcined kaolin, 30-35 parts of clay, 15-18 parts of feldspar, 5-8 parts of acrylic fiber, 7-9 parts of bentonite, and 6-9 parts of limestone; the raw materials of the inner blank layer include an inner blank, and the raw materials of the inner blank include the following components in parts by weight: 60-65 parts of mud, 5-7 parts of stone, 6-8 parts of sand, 7-9 parts of glass fragments, 4-6 parts of plant stems, 4-6 parts of shell fragments, and 4-6 parts of porcelain fragments; In step c, the green body enters a humidity drying furnace for drying. The humidity drying furnace includes a drying chamber. The air inlet temperature of the drying chamber is 50-60 degrees Celsius. The initial setting value of the air inlet humidity of the drying chamber is a relative humidity of 80-90%. The air flow rate in the initial drying stage is 3-4 m / s and lasts for 1-2 hours. The air flow rate in the middle and late stages of drying is 4-5 m / s and lasts for 8-10 hours. The humidity in the drying chamber gradually decreases in the middle and late stages of drying.

2. The process for preparing ceramics using waste materials and environmentally friendly materials according to claim 1, characterized in that: The raw materials of the mud include the following components in parts by weight: 20-25 parts of calcined kaolin, 30-35 parts of clay, 10-15 parts of cotton fiber, and 8-10 parts of pulp.

3. The process for preparing ceramics using waste materials and environmentally friendly materials according to claim 1, characterized in that: In the step e, the outer surface of the blank is partially sprayed with wood ash glaze and moss glaze in sequence: the raw materials of the wood ash glaze, calculated in parts by weight, include the following components: 30-35 parts of kaolin, 20-25 parts of wollastonite, 20-25 parts of silicon dioxide, 5-8 parts of rutile, and 6-8 parts of wood ash; the raw materials of the moss glaze, calculated in parts by weight, include the following components: 35-40 parts of nepheline orthoclase, 25-28 parts of kaolin, 15-18 parts of strontium carbonate, 7-9 parts of ball clay, 9-12 parts of silicon dioxide, 2-5 parts of lithium carbonate, 8-10 parts of copper carbonate, and 3-5 parts of titanium dioxide.

4. The process for preparing ceramics using waste materials and environmentally friendly materials according to claim 1, characterized in that: In the step e, the inner surface of the body is partially sprayed with turquoise glaze, and the raw materials of the turquoise glaze include the following components in parts by weight: 15-18 parts of kaolin, 25-30 parts of silicon dioxide, 20-25 parts of borate, 20-25 parts of lithium carbonate, 10-12 parts of feldspar, 5-8 parts of ball clay, and 2-3 parts of cobalt carbonate.

5. The process for preparing ceramics using waste materials and environmentally friendly materials according to claim 1, characterized in that: In the step a, the frame is woven from bamboo strips, which are woven in warp and weft or shaped by binding with hemp ropes.

6. The process for preparing ceramics using waste materials and environmentally friendly materials according to claim 1, characterized in that: In step b, the process of applying the blank to the outer surface of the skeleton is as follows: first apply a layer of outer blank, then cover it with a layer of wool cloth soaked with the outer blank, and then apply another layer of outer blank; the process of applying the blank to the inner surface of the skeleton is as follows: first apply a layer of mud, then spread a layer of sand in the mud, then add plant stems, then spread another layer of mud, and finally place stones, glass fragments, shell fragments and porcelain fragments.

7. The process for preparing ceramics using waste materials and environmentally friendly materials according to claim 1, characterized in that: In the step d, the first biscuit firing is carried out in an outdoor kiln at a firing temperature of 800 degrees Celsius. After the green body is taken out of the kiln, the ash on the surface of the green body is removed. Then, the second biscuit firing is carried out in an indoor kiln at a firing temperature of 1100 degrees Celsius.

8. The process for preparing ceramics using waste materials and environmentally friendly materials according to claim 1, characterized in that: In the step f, the firing temperature of the glaze firing is 1150-1200 degrees Celsius.

9. The process for preparing ceramics using waste materials and environmentally friendly materials according to claim 1, characterized in that: The humidity drying furnace includes a furnace cavity, an air intake duct, a waste heat intake duct, an exhaust duct, a bypass air duct, and a heating and humidification channel. The furnace cavity is divided into multiple drying chambers, and a side circulation channel is formed between the outermost drying chamber and the inner wall of the furnace cavity. A lower circulation channel is provided at the bottom of the drying chamber and an upper circulation channel is provided at the top. The reflux port at the bottom of the drying chamber is connected to the side circulation channel through the lower circulation channel, and the top of the side circulation channel is connected to the upper circulation channel. A circulation fan is provided above each drying chamber, and an auxiliary burner is provided in the side circulation channel. The air intake duct The waste heat inlet duct is connected to the air inlet end of the heating and humidifying channel, the exhaust end of the heating and humidifying channel is connected to the upper circulation channel, and the interior of the heating and humidifying channel is provided with a humidifying nozzle, an air intake fan, an air intake filter and a main burner in sequence from the air intake end to the exhaust end. The bottom of the exhaust duct is connected to the lower circulation channel, and the middle part is connected to the air inlet end of the heating and humidifying channel through a bypass air duct. Valves are provided on the air inlet duct, the waste heat inlet duct, the exhaust duct and the bypass air duct for adjusting the air intake amount of each channel, and a temperature sensor and a humidity sensor are provided inside the furnace cavity; The air inlet duct is used to introduce external air, and the waste heat inlet duct is used to introduce air with waste heat from the production kiln. After the air is pressurized by the air intake fan in the heating and humidification channel, it is heated by the main burner and then enters the upper circulation channel. The circulation fan introduces the hot air into the drying chamber to dry the green body in the drying chamber. After that, the air passes through the reflux port at the bottom of the drying chamber, the lower circulation channel, and the side circulation channel in turn, and flows back to the upper circulation channel, thereby forming a circulating heating and drying of the hot air. Part of the air enters the exhaust duct from the lower circulation channel and is discharged.

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