CN115557526B - Energy-saving method for cerium oxide tunnel kiln - Google Patents
Energy-saving method for cerium oxide tunnel kiln Download PDFInfo
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- CN115557526B CN115557526B CN202211199620.3A CN202211199620A CN115557526B CN 115557526 B CN115557526 B CN 115557526B CN 202211199620 A CN202211199620 A CN 202211199620A CN 115557526 B CN115557526 B CN 115557526B
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- C—CHEMISTRY; METALLURGY
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- C01F17/00—Compounds of rare earth metals
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- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
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- C01F17/235—Cerium oxides or hydroxides
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- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
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Abstract
The invention provides an energy-saving method for a cerium oxide tunnel kiln, which comprises the following steps: spraying an infrared radiation material on the surface of a refractory material in the inner cavity of the tunnel kiln, and firing at a high temperature to obtain the tunnel kiln with an infrared radiation function; and firing cerium carbonate through a tunnel kiln to obtain qualified cerium oxide. The invention obviously enhances the emissivity of infrared radiation in the tunnel kiln, the emitted far infrared rays directly penetrate into cerium carbonate for heating, improves the temperature field intensity and uniformity in the kiln, shortens the decomposition time of cerium carbonate, is easy to realize spraying of infrared radiation materials no matter a newly-built tunnel kiln or an existing tunnel kiln, obviously reduces the energy consumption of the infrared radiation tunnel kiln, and has practical application value in industrial production.
Description
Technical Field
The invention relates to the field of kiln energy-saving paint, in particular to an energy-saving method for a cerium oxide tunnel kiln.
Background
The cerium oxide has wide application field and can be used as polishing powder, catalyst, electrode material, special glass, ceramic material, detection material, etc. In 2021, the output of cerium oxide in China is 11.03 ten thousand tons, and cerium compounds with purity more than 99% are mainly sold by products such as cerium oxide, cerium carbonate, cerium acetate and cerium chloride according to different application fields, and the cerium compounds are mainly sold by main stream products of cerium oxide and cerium carbonate.
At present, rare earth separation enterprises adopt firing equipment such as tunnel kilns, shuttle kilns, rotary kilns, suspension kilns and the like, wherein the tunnel kilns comprise roller kilns, trolley type tunnel kilns and pusher kilns. The components and the granularity of the cerium oxide products burnt by the rotary kiln and the suspension kiln are uniform, and the cerium oxide products burnt by the rotary kiln and the suspension kiln are applied to enterprises at present. When the tunnel kiln is used for firing the cerium carbonate to prepare the cerium oxide, the temperature of a high temperature zone of the tunnel kiln is controlled to be 850-900 ℃, and the residence time of the high temperature zone is different according to the type, the loading capacity, the temperature of the high temperature zone and the water content of the cerium carbonate of the tunnel kiln; because the loading capacity of the trolley type tunnel kiln is larger, the heat preservation time is longer in the high temperature area, the loading capacity of the roller kiln is relatively smaller, and the heat preservation time is relatively shorter in the high temperature area; the cerium carbonate is filled in each sagger in the tunnel kiln in a larger amount, and the time for transferring heat to the middle part of the sagger is longer, so that the cerium carbonate in the middle part of the sagger is decomposed slowly, and the cerium carbonate in the middle part is completely decomposed by increasing the burning temperature and prolonging the heat preservation time.
The heat generated by the burning kiln heats the object mainly through convection, conduction and radiation, the higher the temperature is, the larger the radiation heat transfer ratio is, and especially when the temperature is higher than 800 ℃, the radiation heat transfer ratio is more than 80%, so that the improvement of the radiation heat transfer efficiency is important for the high-temperature burning energy saving of the tunnel kiln. At present, some enterprises burn cerium oxide by adopting tunnel kiln, and the defects are that: the sagger containing cerium carbonate is placed in different positions in the kiln, the heated reaction temperature is different to a certain extent, particularly, raw materials, close to the edges of the sagger, of the cerium carbonate filled in the sagger are decomposed preferentially in the firing process, cerium carbonate in the middle of the sagger needs to stay in a high-temperature area to be reacted completely, so that cerium oxide in a region with higher temperature in the kiln and a region close to the edges of the sagger have larger particles compared with other regions, even an overburning phenomenon occurs, the particle sizes of cerium oxide powder in different positions in the same sagger are inconsistent, and the temperature control in the cerium oxide firing kiln plays a key role in product quality. At present, the solution of enterprises is that after the sagger is filled with cerium carbonate, a plurality of holes are punched in the middle of the cerium carbonate, so as to improve the decomposition rate and the reaction completion of the cerium carbonate in the middle of the sagger and improve the uniformity of the quality of cerium oxide products.
Disclosure of Invention
In view of the above, the present invention aims to provide an energy-saving method for a cerium oxide tunnel kiln, so as to reduce energy consumption in the cerium oxide burning process.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
an energy-saving method for a cerium oxide tunnel kiln, which comprises the following steps:
1) Spraying an infrared radiation material on the surface of the inner cavity of the tunnel kiln, and burning at high temperature to obtain the tunnel kiln with an infrared radiation function; wherein the infrared radiation material consists of 100-200 parts by weight of CeO 2 10-30 parts of CePO 4 180-220 parts of Al (H) with solid content of 48-58% 2 PO 4 ) 3 The solution composition;
2) And (3) putting the sagger filled with cerium carbonate into an infrared radiation tunnel kiln, and obtaining burnt cerium oxide powder through a preheating area, a high-temperature area and a cooling area.
The infrared radiation material of the invention adopts CeO 2 CePO added to the adhesive 4 The reason is that the Ce compound can avoid introducing rare earth impurities, while Al (H) 2 PO 4 ) 3 And CePO (Cepo) 4 The combined action can lead the bonding strength to be better, avoid the separation of refractory materials and avoid the introduction of non-rare earth impurities.
Further, the infrared radiation material is prepared by the following method:
1) CeO is added with 2 、CePO 4 And a dispersing agent are added into water for high-speed dispersion, and the mass ratio of powder to water is (1-2): 1, the amount of the dispersing agent is 1 per mill to 5 per mill of the total amount of the slurry, the dispersing speed is 800r/min to 1000r/min, and the slurry after complete dispersion is transferred into a sand mill to be sanded until the particle size D is obtained (90) ≤10.0μm；
2) Transferring the sanded slurry into a dispersing machine, and adding adhesive Al (H) 2 PO 4 ) 3 And stirring the solution to obtain the infrared radiation material.
Further, the dispersing agent is one or a mixture of more than two of BYK190, RT-8040 and RT-8022.
In the step 1), before the infrared radiation material is sprayed on the surface of the inner cavity of the tunnel kiln, the surface of the refractory material in the inner cavity of the tunnel kiln is cleaned of fire clay and dust, and after spraying, the material is dried at room temperature, the temperature is raised according to the drying program of the tunnel kiln, and the highest temperature reaches 1200 ℃ and is kept for 2 hours.
Further, in step 2), the temperature of the high temperature zone of the tunnel kiln is generally controlled between 850 ℃ and 900 ℃.
Further, the tunnel kiln is a trolley type tunnel kiln or a roller kiln.
Further, the spraying thickness is 0.2-0.4mm. The spraying thickness is too small, the emissivity is affected, the spraying thickness is too large, and the coating is easy to crack.
The total REO of the cerium oxide powder obtained by the invention is more than 99 percent, and the burning loss is less than 0.5 percent.
Compared with the conventional tunnel kiln, the infrared radiation tunnel kiln has the advantages that the time is shortened by more than 20% through a high-temperature zone, the output of burnt cerium oxide is improved by more than 25%, and the energy is saved by more than 20% per ton of cerium oxide.
The tunnel kilns sprayed with the infrared radiation materials all have full-wave integral emissivity larger than 0.90, and the radiation heat transfer of the tunnel kiln is obviously enhanced by spraying the infrared radiation materials, and meanwhile, the temperature field intensity and uniformity in the kiln are improved, so that the cerium carbonate enters the tunnel kiln to transfer heat sources in convection, conduction and radiation modes, far infrared rays emitted by the radiation materials directly penetrate into the cerium carbonate to be heated, and the cerium carbonate at the edge and the middle part of the sagger is uniformly heated. Along with the gradual temperature rise of the preheating zone of the tunnel kiln, the cerium carbonate gradually releases free water and crystal water, the anhydrous cerium carbonate formed after dehydration is slowly decomposed to release carbon dioxide, and the cerium carbonate is completely decomposed to form cerium oxide in the high-temperature zone, and the radiation material emits far infrared rays to accelerate the reaction speed of converting cerium carbonate in the middle of the sagger into cerium oxide, so that the decomposition time of the cerium carbonate is shortened, and the speed of the sagger passing through the kiln body is improved.
Compared with the prior art, the energy-saving method for the cerium oxide tunnel kiln has the following advantages:
(1) The invention obviously enhances the infrared radiation emissivity in the tunnel kiln, improves the temperature field intensity and uniformity in the kiln, saves more than 20% of energy source per ton of cerium oxide compared with the conventional tunnel kiln with the same model, and improves the burning yield of cerium oxide by more than 25%.
(2) The invention adopts the infrared radiation material, the far infrared rays emitted by the infrared radiation material directly penetrate into the cerium carbonate for heating, thereby enhancing the decomposition reaction energy of the cerium carbonate at the middle part of the sagger, promoting the accelerated decomposition of the cerium carbonate at the middle part, obviously shortening the time of the sagger passing through a high temperature area, ensuring uniform particle size distribution of cerium oxide powder in the sagger, and solving the problems of larger cerium oxide powder particles near the edge area of the sagger and even overburning.
(3) The invention has the advantages that the infrared radiation material sprayed on the surface of the inner cavity refractory material is the same as the firing material element, the pollution of the compound in the refractory material to the cerium oxide is obviously prevented, the purity of the cerium oxide product is not affected, and the difficult problem of non-rare earth impurity pollution in the cerium oxide firing process is solved.
(4) The infrared radiation material has higher stability in high-temperature, reduction and oxidation environments, prevents gas generated by the decomposition of cerium carbonate from corroding kiln bodies, and prolongs the service life of the tunnel kiln.
(5) The high temperature adhesive Al (H) in the infrared radiation material of the invention 2 PO 4 ) 3 And CePO (Cepo) 4 At 1200 ℃ with CeO 2 Tightly combined with refractory material, al (H) at high temperature 2 PO 4 ) 3 Formation of aluminum metaphosphate, ceO 2 、CePO 4 The aluminum metaphosphate and the refractory material jointly act to produce a layer of compact ceramic phase structure glaze, the firing temperature of the infrared radiation tunnel kiln is 1200 ℃, and the highest firing temperature of the cerium oxide is 900 ℃, so that aluminum and phosphorus cannot enter the cerium oxide, and the purity of the cerium oxide product is ensured.
(6) CeO in the infrared radiation material of the invention 2 And CePO (Cepo) 4 Has very high infrared radiation emissivity, and the ignition loss analysis data of the cerium oxide products in each sagger in the tunnel kiln are similar and the particle size distribution is uniform.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a scatter plot of the time reduction rate and the cerium oxide yield improvement rate for the high temperature period of examples 1-4 and comparative examples 1-6.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
An energy-saving method for a cerium oxide tunnel kiln, which comprises the following steps:
(1) Infrared radiation roller kiln: in a roller kiln with the length of 40 meters, removing refractory clay and dust from the surface of refractory materials in the inner cavity of the roller kiln, spraying infrared radiation materials on the surface of the inner cavity of the roller kiln, wherein the spraying thickness is 0.3mm, drying at room temperature, heating according to a drying program of the roller kiln, and keeping the temperature at the highest temperature of 1200 ℃ for 2 hours to obtain the roller kiln with an infrared radiation function, wherein the total-wave integral emissivity of the infrared radiation roller kiln is more than 0.90 within the working temperature range of 25-900 ℃;
the preparation method of the infrared radiation material comprises the following steps: 100 parts of CeO 2 10 parts of CePO 4 And 0.22 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the amount of the dispersing agent is 1 per mill of the total amount of the slurry, the dispersing speed is 1000r/min, and the slurry after complete dispersion is transferred into a sand mill for sand milling until the particle size D is obtained (90) Less than or equal to 10.0 mu m; transferring the sanded slurry into a dispersing machine, adding 200 parts of Al (H) 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation roller kiln is controlled at 850 ℃, a sagger filled with cerium carbonate enters the infrared radiation roller kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning is reduced by less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the time is reduced from 4 hours to 3 hours through a high temperature zone at 850 ℃, the time is shortened by 25.0%, the output of the burnt cerium oxide of the infrared radiation roller kiln is improved by 33.33%, and the energy is saved by 25.0% for each ton of cerium oxide.
Example 2
An energy-saving method for a cerium oxide tunnel kiln, which comprises the following steps:
(1) Infrared radiation roller kiln: in a roller kiln with the length of 40 meters, removing refractory clay and dust from the surface of refractory materials in the inner cavity of the roller kiln, spraying infrared radiation materials on the surface of the inner cavity of the roller kiln, wherein the spraying thickness is 0.3mm, drying at room temperature, heating according to a drying program of the roller kiln, and keeping the temperature at the highest temperature of 1200 ℃ for 2 hours to obtain the roller kiln with an infrared radiation function, wherein the total-wave integral emissivity of the infrared radiation roller kiln is more than 0.90 within the working temperature range of 25-900 ℃;
the preparation method of the infrared radiation material comprises the following steps: 100 parts of CeO 2 10 parts of CePO 4 And 0.66 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the amount of the dispersing agent is 3 per mill of the total amount of the slurry, the dispersing speed is 800r/min, and the slurry after complete dispersion is transferred into a sand mill for sand milling until the particle size D is obtained (90) Less than or equal to 10.0 mu m; transferring the sanded slurry into a dispersing machine, adding 200 parts of Al (H) 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation roller kiln is controlled to be 880 ℃, a sagger filled with cerium carbonate enters the infrared radiation roller kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning is reduced by less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the time of the roller kiln in a high temperature zone is reduced from 3 hours to 2.4 hours, the time is shortened by 20.0 percent, the output of the burnt cerium oxide of the infrared radiation roller kiln is improved by 25.0 percent, and the energy is saved by 20.0 percent per ton of cerium oxide produced.
Example 3
An energy-saving method for a cerium oxide tunnel kiln, which comprises the following steps:
(1) Infrared radiation trolley type tunnel kiln: in a trolley type tunnel kiln with the length of 72 meters, removing refractory clay and dust from the surface of refractory materials in the inner cavity of the trolley type tunnel kiln, spraying infrared radiation materials on the surface of the inner cavity of the kiln, wherein the spraying thickness is 0.3mm, drying at room temperature, heating according to a drying program of the trolley type tunnel kiln, and keeping the temperature at the highest temperature of 1200 ℃ for 2 hours to obtain the trolley type tunnel kiln with the infrared radiation function, wherein the integral emissivity of the infrared radiation trolley type tunnel kiln is more than 0.90 in the working temperature range of 25-900 ℃;
the preparation method of the infrared radiation material comprises the following steps: will be100 parts of CeO 2 10 parts of CePO 4 And 0.83 part of dispersant BYK190 are added into 55 parts of water for high-speed dispersion, and the powder-water ratio is 2:1, the amount of the dispersing agent is 5 per mill of the total amount of the slurry, the dispersing speed is 1000r/min, and the slurry after complete dispersion is transferred into a sand mill for sand milling until the particle size D is obtained (90) Less than or equal to 5.0 mu m; transferring the sanded slurry into a dispersing machine, adding 200 parts of Al (H) 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation trolley type tunnel kiln is controlled to be 900 ℃, a sagger filled with cerium carbonate is placed on a trolley and then enters the infrared radiation trolley type tunnel kiln, and the total REO in the obtained cerium oxide powder is more than 99% and the burning is reduced by less than 0.5% through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide trolley type tunnel kiln, the infrared radiation trolley type tunnel kiln has the advantages that the time of the trolley type tunnel kiln in a high temperature area is reduced from 7h to 5.5h, the time is shortened by 21.43%, the output of the cerium oxide burnt by the infrared radiation trolley type tunnel kiln is improved by 27.27%, and the energy is saved by 21.43% for each ton of cerium oxide.
Example 4
An energy-saving method for a cerium oxide tunnel kiln, which comprises the following steps:
(1) Infrared radiation trolley type tunnel kiln: in a trolley type tunnel kiln with the length of 72 meters, removing refractory clay and dust from the surface of refractory materials in the inner cavity of the trolley type tunnel kiln, spraying infrared radiation materials on the surface of the inner cavity of the kiln, wherein the spraying thickness is 0.3mm, drying at room temperature, heating according to a drying program of the trolley type tunnel kiln, and keeping the temperature at the highest temperature of 1200 ℃ for 2 hours to obtain the trolley type tunnel kiln with the infrared radiation function, wherein the integral emissivity of the infrared radiation trolley type tunnel kiln is more than 0.90 in the working temperature range of 25-900 ℃;
the preparation method of the infrared radiation material comprises the following steps: 200 parts of CeO 2 20 parts of CePO 4 And 0.33 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the quantity of the dispersing agent is 1 per mill of the total quantity of the slurry, and the dispersing rotating speed is highTransferring the slurry after complete dispersion into a sand mill for sand milling at 1000r/min to obtain a particle size D (90) Less than or equal to 10.0 mu m. Transferring the sanded slurry into a dispersing machine, adding 200 parts of Al (H) 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation trolley type tunnel kiln is controlled to be 880 ℃, a sagger filled with cerium carbonate is placed on a trolley and then enters the infrared radiation trolley type tunnel kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning loss is less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide trolley type tunnel kiln, the infrared radiation trolley type tunnel kiln has the advantages that the time of the trolley type tunnel kiln in a high temperature area is reduced from 9 hours to 7 hours, the time is shortened by 22.22%, the burning cerium oxide yield of the infrared radiation trolley type tunnel kiln is improved by 28.57%, and the energy is saved by 22.22% for each ton of cerium oxide.
Comparative example 1
Based on the above example 1, the method for preparing the infrared radiation material in the step (1) is as follows: 110 parts of CeO 2 And 0.22 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the amount of the dispersing agent is 1 per mill of the total amount of the slurry, the dispersing speed is 1000r/min, and the slurry after complete dispersion is transferred into a sand mill for sand milling until the particle size D is obtained (90) Less than or equal to 10.0 mu m; transferring the sanded slurry into a dispersing machine, adding 200 parts of adhesive Al (H 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
obtaining a roller kiln with an infrared radiation function, wherein the total-wave integral emissivity of the infrared radiation roller kiln is more than 0.86 within the working temperature range of 25-900 ℃;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation roller kiln is controlled at 850 ℃, a sagger filled with cerium carbonate enters the infrared radiation roller kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning is reduced by less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the time is reduced from 4 hours to 3.5 hours through the high temperature zone at 850 ℃ of the roller kiln, the time is shortened by 12.5%, the output of the burnt cerium oxide of the infrared radiation roller kiln is improved by 14.29%, and the energy is saved by 12.5% for each ton of cerium oxide.
Comparative example 2
Based on the above example 1, the method for preparing the infrared radiation material in the step (1) is as follows: 110 parts CePO 4 And 0.22 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the amount of the dispersing agent is 1 per mill of the total amount of the slurry, the dispersing speed is 1000r/min, and the slurry after complete dispersion is transferred into a sand mill for sand milling until the particle size D is obtained (90) Less than or equal to 10.0 mu m; the sanded slurry was then transferred to a disperser and 200 parts of Al (H) 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
obtaining a roller kiln with an infrared radiation function, wherein the total-wave integral emissivity of the infrared radiation roller kiln is more than 0.87 within the working temperature range of 25-900 ℃;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation roller kiln is controlled at 850 ℃, a sagger filled with cerium carbonate enters the infrared radiation roller kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning is reduced by less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the time is reduced from 4 hours to 3.4 hours through the high temperature zone at 850 ℃ of the roller kiln, the time is shortened by 15.0%, the output of burning cerium oxide of the infrared radiation roller kiln is improved by 17.65%, and the energy is saved by 15.0% for each ton of cerium oxide.
Comparative example 3
Based on the above example 1, the method for preparing the infrared radiation material in the step (1) is as follows: 100 parts of CeO 2 10 parts of CePO 4 And 0.22 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the amount of the dispersing agent is 1 per mill of the total slurry, the dispersing speed is 1000r/min, and the slurry after complete dispersion is transferredGrinding in a sand mill to obtain particle diameter D (90) Less than or equal to 10.0 mu m; the sanded slurry was then transferred to a disperser and 300 parts of Al (H) 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
obtaining a roller kiln with an infrared radiation function, wherein the total-wave integral emissivity of the infrared radiation roller kiln is more than 0.85 within the working temperature range of 25-900 ℃;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation roller kiln is controlled at 850 ℃, a sagger filled with cerium carbonate enters the infrared radiation roller kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning is reduced by less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the time of the roller kiln in a high temperature zone is reduced from 4 hours to 3.6 hours at the temperature of 850 ℃, the time is shortened by 10.0%, the output of the burnt cerium oxide of the infrared radiation roller kiln is improved by 11.11%, and the energy is saved by 10.0% for each ton of cerium oxide.
Comparative example 4
Based on the above example 1, the method for preparing the infrared radiation material in the step (1) is as follows: 100 parts of CeO 2 10 parts of CePO 4 And 0.22 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the amount of the dispersing agent is 1 per mill of the total amount of the slurry, the dispersing speed is 1000r/min, and the slurry after complete dispersion is transferred into a sand mill for sand milling until the particle size D is obtained (90) Less than or equal to 10.0 mu m; transferring the sanded slurry to a dispersing machine, and adding 200 parts of 30% silica sol solution by mass concentration to prepare an infrared radiation coating;
obtaining a roller kiln with an infrared radiation function, wherein the total-wave integral emissivity of the infrared radiation roller kiln is more than 0.86 within the working temperature range of 25-900 ℃;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation roller kiln is controlled at 850 ℃, a sagger filled with cerium carbonate enters the infrared radiation roller kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning is reduced by less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the time is reduced from 4 hours to 3.5 hours through the high temperature zone at 850 ℃ of the roller kiln, the time is shortened by 12.5%, the output of the burnt cerium oxide of the infrared radiation roller kiln is improved by 14.29%, and the energy is saved by 12.5% for each ton of cerium oxide.
Comparative example 5
Based on the above example 1, the method for preparing the infrared radiation material in the step (1) is as follows: 90 parts of CeO 2 20 parts of CePO 4 And 0.22 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the amount of the dispersing agent is 1 per mill of the total amount of the slurry, the dispersing speed is 1000r/min, and the slurry after complete dispersion is transferred into a sand mill for sand milling until the particle size D is obtained (90) Less than or equal to 10.0 mu m; the sanded slurry was then transferred to a disperser and 200 parts of Al (H) 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
obtaining a roller kiln with an infrared radiation function, wherein the total-wave integral emissivity of the infrared radiation roller kiln is more than 0.86 within the working temperature range of 25-900 ℃;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation roller kiln is controlled at 850 ℃, a sagger filled with cerium carbonate enters the infrared radiation roller kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning is reduced by less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the time is reduced from 4 hours to 3.45 hours through a high temperature zone at 850 ℃, the time is shortened by 13.75%, the output of the burnt cerium oxide of the infrared radiation roller kiln is improved by 15.94%, and the energy is saved by 13.75% for each ton of cerium oxide.
Comparative example 6
Based on the above example 1, the method for preparing the infrared radiation material in the step (1) is as follows: 105 parts of CeO 2 5 parts of CePO 4 And 0.22 part of dispersant BYK190 are added into 110 parts of water for high-speed dispersion, and the powder-water ratio is 1:1, the amount of the dispersing agent is 1 per mill of the total slurryThe dispersing rotating speed is 1000r/min, and the slurry after the complete dispersing is transferred into a sand mill for sand milling until the particle size D is obtained (90) Less than or equal to 10.0 mu m; the sanded slurry was then transferred to a disperser and 200 parts of Al (H) 2 PO 4 ) 3 The solution is used for preparing the infrared radiation coating;
obtaining a roller kiln with an infrared radiation function, wherein the total-wave integral emissivity of the infrared radiation roller kiln is more than 0.86 within the working temperature range of 25-900 ℃;
(2) Cerium oxide preparation: the temperature of a high-temperature area of the infrared radiation roller kiln is controlled at 850 ℃, a sagger filled with cerium carbonate enters the infrared radiation roller kiln, and the total REO in the obtained cerium oxide powder is more than 99 percent and the burning is reduced by less than 0.5 percent through a preheating area, a high-temperature area and a cooling area;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the time of the roller kiln in a high temperature zone is reduced from 4 hours to 3.55 hours at the temperature of 850 ℃, the time is shortened by 11.25%, the output of the burnt cerium oxide of the infrared radiation roller kiln is improved by 12.68%, and the energy is saved by 11.25% for each ton of cerium oxide.
Table 1 comparison of the results of examples 1-4
Table 2 comparison of the results of comparative examples 1-6
The comparison shows that the energy saving of the cerium oxide tunnel kiln can be obviously realized by adopting the method, the time is shortened by more than 20% through a high temperature period, the cerium oxide yield is improved by more than 25%, and the energy saving per ton of cerium oxide is realized by more than 20%. The invention proposesThe formula of the infrared radiation material of (2) is the optimal formula, and CeO is changed 2 、CePO 4 Or the proportion and the type of the binder, the time for cerium oxide to pass through the high-temperature section of the kiln is shortened by less than 20 percent, and the cerium oxide yield is improved by less than 25 percent. This is because, in the material formulation proposed in the present invention, al (H 2 PO 4 ) 3 CeO at high temperature and proper proportion 2 、CePO 4 And the base material reacts to generate a high-emissivity glaze layer with compact ceramic phase, so that the reaction efficiency of cerium oxide calcination is improved, the reaction time is reduced, and the energy conservation of the tunnel kiln is realized. The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The energy-saving method for the cerium oxide tunnel kiln is characterized by comprising the following steps of: the method comprises the following steps:
1) Spraying an infrared radiation material on the surface of the inner cavity of the tunnel kiln, and burning at high temperature to obtain the tunnel kiln with an infrared radiation function; wherein the infrared radiation material consists of 100-200 parts by weight of CeO 2 10-30 parts of CePO 4 180-220 parts of Al (H) with solid content of 48-58% 2 PO 4 ) 3 The solution composition;
2) Putting a sagger filled with cerium carbonate into an infrared radiation tunnel kiln, and obtaining burned cerium oxide powder through a preheating zone, a high-temperature zone and a cooling zone;
the infrared radiation material is prepared by the following method:
1) CeO is added with 2 、CePO 4 And a dispersing agent are added into water for high-speed dispersion, and the mass ratio of powder to water is (1-2): 1, the amount of the dispersing agent is 1 per mill to 5 per mill of the total amount of the slurry, the dispersing speed is 800r/min to 1000r/min, and the slurry after complete dispersion is transferred into a sand mill to be sanded until the particle size D is obtained (90) ≤10.0μm；
2) Transferring the sanded slurry into a dispersing machine, and adding adhesive Al (H) 2 PO 4 ) 3 The solution is stirred to obtain infrared radiationA material;
the dispersing agent is one or more than two of BYK190, RT-8040 and RT-8022.
2. The energy saving method for a cerium oxide tunnel kiln according to claim 1, wherein: in the step 1), before the surface of the inner cavity of the tunnel kiln is sprayed with the infrared radiation material, the surface of the inner cavity refractory material of the tunnel kiln is cleaned of fire clay and dust, after spraying, the material is dried at room temperature, the temperature is raised according to the drying program of the tunnel kiln, and the highest temperature reaches 1200 ℃ and is kept for 2 hours.
3. The energy saving method for a cerium oxide tunnel kiln according to claim 1, wherein: in the step 2), the temperature of the high temperature area of the tunnel kiln is controlled between 850 ℃ and 900 ℃.
4. The energy saving method for a cerium oxide tunnel kiln according to claim 1, wherein: the tunnel kiln is a trolley type tunnel kiln or a roller kiln.
5. The energy saving method for a cerium oxide tunnel kiln according to claim 1, wherein: the spraying thickness is 0.2-0.4mm.
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Citations (5)
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|---|---|---|---|---|
| US4239548A (en) * | 1978-12-21 | 1980-12-16 | Tioxide Group Limited | Titanium dioxide pigment |
| JPH11189766A (en) * | 1997-12-26 | 1999-07-13 | Kao Corp | Cerium phosphate-based ultraviolet absorber and its production |
| KR20030078487A (en) * | 2002-03-29 | 2003-10-08 | 이재춘 | High Emissivity Coating Composition and Coated Vacuum Chamber |
| CN101760058A (en) * | 2010-02-01 | 2010-06-30 | 张春雨 | High-temperature counter radiation resistant inorganic coating and preparation method thereof |
| CN105924184A (en) * | 2016-04-20 | 2016-09-07 | 浙江大学 | High-temperature infrared radiant coating used for industrial furnace and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006001640A1 (en) * | 2006-01-11 | 2007-07-12 | Degussa Gmbh | Coating a substrate, useful as a wall paper, comprises providing a substrate, applying a composition containing metal and/or metalloid on side of the substrate, drying and applying the composition on other side of substrate and drying |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4239548A (en) * | 1978-12-21 | 1980-12-16 | Tioxide Group Limited | Titanium dioxide pigment |
| JPH11189766A (en) * | 1997-12-26 | 1999-07-13 | Kao Corp | Cerium phosphate-based ultraviolet absorber and its production |
| KR20030078487A (en) * | 2002-03-29 | 2003-10-08 | 이재춘 | High Emissivity Coating Composition and Coated Vacuum Chamber |
| CN101760058A (en) * | 2010-02-01 | 2010-06-30 | 张春雨 | High-temperature counter radiation resistant inorganic coating and preparation method thereof |
| CN105924184A (en) * | 2016-04-20 | 2016-09-07 | 浙江大学 | High-temperature infrared radiant coating used for industrial furnace and preparation method thereof |
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