CN115557526A - Cerium oxide tunnel kiln energy-saving method - Google Patents
Cerium oxide tunnel kiln energy-saving method Download PDFInfo
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- CN115557526A CN115557526A CN202211199620.3A CN202211199620A CN115557526A CN 115557526 A CN115557526 A CN 115557526A CN 202211199620 A CN202211199620 A CN 202211199620A CN 115557526 A CN115557526 A CN 115557526A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/20—Compounds containing only rare earth metals as the metal element
- C01F17/206—Compounds containing only rare earth metals as the metal element oxide or hydroxide being the only anion
- C01F17/224—Oxides or hydroxides of lanthanides
- C01F17/235—Cerium oxides or hydroxides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F17/00—Compounds of rare earth metals
- C01F17/10—Preparation or treatment, e.g. separation or purification
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
- F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention provides a cerium oxide tunnel kiln energy-saving method, which comprises the following steps: spraying an infrared radiation material on the surface of the refractory material in the inner cavity of the tunnel kiln, and firing at high temperature to obtain the tunnel kiln with the infrared radiation function; and (4) firing the cerium carbonate by using a tunnel kiln to obtain the qualified cerium oxide. The invention obviously enhances the infrared radiation emissivity in the tunnel kiln, the emitted far infrared rays directly penetrate into the cerium carbonate for heating, the temperature field intensity and the uniformity in the kiln are improved, the decomposition time of the cerium carbonate is shortened, and the infrared radiation tunnel kiln obviously reduces the energy consumption no matter a newly-built tunnel kiln or the existing tunnel kiln easily realizes the spraying of the infrared radiation material, thereby having practical application value in industrial production.
Description
Technical Field
The invention relates to the field of kiln energy-saving coatings, in particular to a cerium oxide tunnel kiln energy-saving method.
Background
The cerium oxide has wide application fields and can be used as polishing powder, a catalyst, an electrode material, special glass, a ceramic material, a detection material and the like. In 2021, the output of cerium oxide in China is 11.03 ten thousand tons, cerium compounds required by different application fields are different, cerium compounds with the purity of more than 99 percent are mainly sold as cerium oxide, cerium carbonate, cerium acetate, cerium chloride and other products, and cerium compounds are mainly sold as main products of cerium oxide and cerium carbonate.
At present, rare earth separation enterprises adopt firing equipment such as tunnel kilns, shuttle kilns, rotary kilns and suspension kilns, wherein the tunnel kilns comprise roller kilns, trolley type tunnel kilns and pushed slab kilns. Cerium oxide products fired by rotary kilns and suspension kilns are uniform in components and particle sizes and are currently applied to enterprises. When cerium carbonate is burned by adopting a tunnel kiln to prepare 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; the loading capacity of the trolley type tunnel kiln is large, so that the heat preservation time in a high-temperature area is long, the loading capacity of the roller kiln is relatively small, and the heat preservation time in the high-temperature area is relatively short; the cerium carbonate filled in each sagger in the tunnel kiln has larger amount, the heat is transmitted to the middle part of the sagger for longer time, so that the decomposition of the cerium carbonate in the middle part of the sagger is slower, and the cerium carbonate in the middle part is completely decomposed by increasing the firing temperature and prolonging the heat preservation time.
The heat generated by the burning kiln is mainly used for heating an object through convection, conduction and radiation, the higher the temperature is, the larger the radiation heat transfer ratio is, and particularly when the temperature is more than 800 ℃, the radiation heat transfer ratio reaches more than 80%, so that the improvement of the radiation heat transfer efficiency is of great importance to the high-temperature burning energy conservation of the tunnel kiln. At present, some enterprises adopt a tunnel kiln to burn cerium oxide, and the defects are as follows: the saggars filled with cerium carbonate are placed in different positions in a kiln, the heated reaction temperatures of the saggars are different, particularly, the raw materials close to the edges of the saggars are preferentially decomposed when the saggars are filled with the cerium carbonate in the saggars in the firing process, and the cerium carbonate in the saggars can be completely reacted only by staying for a certain time in a high-temperature area, so that cerium oxide in an area with higher temperature in the kiln and an area close to the edges of the saggars are larger in particle size compared with other areas, even an overburning phenomenon occurs, the particle sizes of cerium oxide powder in different positions in the same saggar are inconsistent, and the temperature control in the cerium oxide firing kiln plays a key role in product quality. At present, the solution of the enterprise is to prick a plurality of holes in the middle of cerium carbonate after the sagger is filled with the cerium carbonate, so as to improve the decomposition rate and complete reaction of the cerium carbonate in the middle of the sagger and improve the quality uniformity of cerium oxide products.
Disclosure of Invention
In view of this, the present invention provides an energy saving method for a cerium oxide tunnel kiln to reduce energy consumption during the burning process of cerium oxide.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a cerium oxide tunnel kiln energy-saving method comprises the following steps:
1) Spraying an infrared radiation material on the surface of the inner cavity of the tunnel kiln, and firing at a high temperature to obtain the tunnel kiln with the infrared radiation function; wherein the infrared radiation material consists of 100 to 200 parts of CeO by weight 2 10-30 parts of CePO 4 And 180-220 parts of solid content of 48% -58% of Al (H) 2 PO 4 ) 3 Solution composition;
2) And (3) putting the sagger filled with the cerium carbonate into an infrared radiation tunnel kiln, and passing through a preheating zone, a high-temperature zone and a cooling zone to obtain the burned cerium oxide powder.
The infrared radiation material of the invention adopts CeO 2 CePO was added to the binder 4 The reason is that the compound of Ce can avoid introducing rare earth impurities and Al (H) is introduced 2 PO 4 ) 3 And CePO 4 The combined action can make the bonding strength 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 2 、CePO 4 And a dispersant is 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 1-5 per mill of the total amount of the slurry, the dispersing rotating speed is 800-1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D is reached (90) ≤10.0μm；
2) Then transferring the ground slurry into a dispersion machine, and adding a binder Al (H) 2 PO 4 ) 3 And stirring the solution to obtain the infrared radiation material.
Further, the dispersant is one or a mixture of more than two of BYK190, RT-8040 and RT-8022.
Further, 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 of the inner cavity of the tunnel kiln is cleaned of refractory clay and dust, after spraying, the inner cavity of the tunnel kiln is dried at room temperature, the temperature is raised according to the drying program of the tunnel kiln, and the heat is preserved for 2 hours when the highest temperature reaches 1200 ℃.
Further, in the step 2), the temperature of the high-temperature zone of the tunnel kiln is controlled to be 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 influenced, the spraying thickness is too large, and the coating is easy to crack.
The cerium oxide powder obtained by the invention has the total rare earth REO of more than 99 percent and the ignition loss of less than 0.5 percent.
Compared with the conventional tunnel kiln, the infrared radiation tunnel kiln obtained by the invention shortens the time by more than 20% when passing through a high-temperature zone, improves the output of the burnt cerium oxide by more than 25%, and saves the energy by more than 20% per ton of the produced cerium oxide.
The tunnel kilns sprayed with the infrared radiation materials have the total wavelength integral emissivity of more than 0.90, the sprayed infrared radiation materials obviously enhance the radiation heat transfer of the tunnel kilns, and simultaneously improve the temperature field intensity and uniformity in the kilns, so that the cerium carbonate has heat source transfer modes of convection, conduction and radiation when entering the tunnel kilns, the far infrared rays emitted by the radiation materials directly penetrate into the cerium carbonate for heating, and the cerium carbonate at the edges and the middle parts of the saggars is uniformly heated. Along with the gradual rise of the temperature of the preheating zone of the tunnel kiln, the cerium carbonate gradually removes free water and crystal water, the anhydrous cerium carbonate formed after dehydration is slowly decomposed to release carbon dioxide, the cerium carbonate is completely decomposed to form cerium oxide in the high-temperature zone, the radiation material emits far infrared rays to accelerate the reaction speed of converting the cerium carbonate in the middle of the sagger into the cerium oxide, 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 cerium oxide tunnel kiln energy-saving method 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 sources for producing each ton of cerium oxide compared with the conventional tunnel kiln with the same model, and improves more than 25% of the cerium oxide ignition yield.
(2) The infrared radiation material is adopted, the emitted far infrared rays directly penetrate into the cerium carbonate for heating, the decomposition reaction energy of the cerium carbonate at the middle part of the sagger is enhanced, the accelerated decomposition of the cerium carbonate at the middle part is promoted, the time of the sagger passing through a high-temperature zone is obviously shortened, the particle size distribution of cerium oxide powder in the sagger is uniform, and the problems that the cerium oxide powder particles near the edge area of the sagger are large and even overburning occurs are solved.
(3) The infrared radiation material sprayed on the surface of the inner cavity refractory material is the same as the elements of the firing material, so that the pollution of the compound in the refractory material to cerium oxide is obviously prevented, the purity of the cerium oxide product is not influenced, and the 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, reducing and oxidizing environments, prevents gas generated by decomposing cerium carbonate from corroding a kiln body, and prolongs the service life of a tunnel kiln.
(5) The invention relates to a high-temperature adhesive Al (H) in an infrared radiation material 2 PO 4 ) 3 And CePO 4 At 1200 deg.C with CeO 2 Al (H) at high temperature in close contact with refractory material 2 PO 4 ) 3 Formation of aluminum metaphosphate, ceO 2 、CePO 4 The aluminum metaphosphate and the refractory material act together to produce a layer of glaze surface with a compact ceramic phase structure, the firing temperature of the infrared radiation tunnel kiln is 1200 ℃, and the maximum 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 4 The emission reduction 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, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
FIG. 1 is a scatter diagram showing the time shortening rate of the high temperature section and the yield improvement rate of cerium oxide in examples 1 to 4 and comparative examples 1 to 6.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
A cerium oxide tunnel kiln energy-saving method comprises the following steps:
(1) Infrared radiation roller kilns: in a roller kiln with the length of 40 meters, removing refractory clay and dust from the surface of a refractory material in an inner cavity of the roller kiln, spraying an infrared radiation material 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, keeping the temperature for 2 hours when the highest temperature reaches 1200 ℃, and obtaining the roller kiln with the infrared radiation function, wherein the integral emissivity of the infrared radiation roller kiln at the full wavelength 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 is added into 110 parts of water to be dispersed at high speed, 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 dispersion rotating speed is 1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m; transferring the sanded slurry to a disperser, adding 200 parts of Al (H) with a solids content of 50% 2 PO 4 ) 3 Preparing the infrared radiation coating from the solution;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature area of the infrared radiation roller kiln to be 850 ℃, enabling the sagger filled with the cerium carbonate to enter the infrared radiation roller kiln, and enabling the sagger to pass through a preheating area, the high-temperature area and a cooling area, wherein the total content REO of rare earth in the obtained cerium oxide powder is more than 99%, and the ignition loss is less than 0.5%;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln reduces the time from 4 hours to 3 hours through the high-temperature region at the temperature of 850 ℃ in the high-temperature region of the roller kiln, shortens the time by 25.0 percent, improves the yield of the cerium oxide burnt by the infrared radiation roller kiln by 33.33 percent, and saves the energy by 25.0 percent per ton of the produced cerium oxide.
Example 2
An energy-saving method for a cerium oxide tunnel kiln comprises the following steps:
(1) Infrared radiation roller kilns: in a roller kiln with the length of 40 meters, removing refractory clay and dust from the surface of a refractory material in an inner cavity of the roller kiln, spraying an infrared radiation material 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, keeping the temperature for 2 hours when the highest temperature reaches 1200 ℃, and obtaining the roller kiln with the infrared radiation function, wherein the full-wavelength integral emissivity of the infrared radiation roller kiln is greater 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, adding the mixture into 110 parts of water, and dispersing at a high speed, wherein 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 rotating speed is 800r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m; transferring the sanded slurry to a disperser, adding 200 parts of Al (H) with a solids content of 50% 2 PO 4 ) 3 Preparing the infrared radiation coating from the solution;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature region of the infrared radiation roller kiln at 880 ℃, enabling a sagger filled with cerium carbonate to enter the infrared radiation roller kiln, and enabling the sagger to pass through a preheating region, the high-temperature region and a cooling region, wherein the total REO content of rare earth in the obtained cerium oxide powder is more than 99%, and the ignition loss is less than 0.5%;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln reduces the time from 3 hours to 2.4 hours through the high-temperature zone at the temperature of 880 ℃ in the high-temperature zone of the roller kiln, shortens the time by 20.0 percent, improves the output of the cerium oxide burnt by the infrared radiation roller kiln by 25.0 percent, and saves the energy by 20.0 percent when producing each ton of cerium oxide.
Example 3
An energy-saving method for a cerium oxide tunnel kiln 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 a refractory material in an inner cavity of the trolley type tunnel kiln, spraying an infrared radiation material 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 for 2 hours when the highest temperature reaches 1200 ℃, so as to obtain the trolley type tunnel kiln with the infrared radiation function, wherein the integral emissivity of the infrared radiation trolley type tunnel kiln at the full wavelength 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 0.83 parts 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 rotating speed is 1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D is reached (90) Less than or equal to 5.0 mu m; transferring the sanded slurry to a disperser, adding 200 parts of Al (H) with a solids content of 50% 2 PO 4 ) 3 Preparing the infrared radiation coating by using the solution;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature region of the infrared radiation trolley type tunnel kiln to be 900 ℃, placing a sagger filled with cerium carbonate on a trolley, then entering the infrared radiation trolley type tunnel kiln, and passing through a preheating region, the high-temperature region and a cooling region to obtain cerium oxide powder with the total content of rare earth REO of more than 99 percent and the ignition loss of less than 0.5 percent;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide trolley type tunnel kiln, the infrared radiation trolley type tunnel kiln reduces the time from 7 hours to 5.5 hours through a high-temperature area under the condition that the temperature of the high-temperature area of the trolley type tunnel kiln is 900 ℃, the time is shortened by 21.43 percent, the yield of the cerium oxide fired by the infrared radiation trolley type tunnel kiln is improved by 27.27 percent, and the energy is saved by 21.43 percent per ton of the cerium oxide produced.
Example 4
An energy-saving method for a cerium oxide tunnel kiln comprises the following steps:
(1) Infrared radiation car-type tunnel cave: in a trolley type tunnel kiln with the length of 72 meters, removing refractory clay and dust from the surface of a refractory material in an inner cavity of the trolley type tunnel kiln, spraying an infrared radiation material 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 for 2 hours when the highest temperature reaches 1200 ℃, so as to obtain the trolley type tunnel kiln with the infrared radiation function, wherein the integral emissivity of the infrared radiation trolley type tunnel kiln at the full wavelength is greater than 0.90 within the range of the working temperature 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 is added into 110 parts of water to be dispersed at high speed, 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 rotating speed is 1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m. The sanded slurry was transferred to a disperser and 200 parts of Al (H) was added at 50% solids 2 PO 4 ) 3 Preparing the infrared radiation coating by using the solution;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature region of the infrared radiation trolley type tunnel kiln to be 880 ℃, placing a sagger filled with cerium carbonate on a trolley, then entering the infrared radiation trolley type tunnel kiln, and passing through a preheating region, the high-temperature region and a cooling region to obtain cerium oxide powder with the total content of rare earth REO more than 99% and the ignition loss less than 0.5%;
(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 passing through a high-temperature zone is reduced from 9 hours to 7 hours at the temperature of 880 ℃, the time is shortened by 22.22%, the yield of cerium oxide burnt by the infrared radiation trolley type tunnel kiln is improved by 28.57%, and the energy is saved by 22.22% per ton of cerium oxide produced.
Comparative example 1
On the basis of the above example 1, the preparation method of the infrared radiation material in the step (1) is as follows: 110 parts of CeO 2 And 0.22 part of dispersant BYK190 is added into 110 parts of water to be dispersed at high speed, and the powder-water ratio is 1:1, the amount of the dispersant is the total amount of the slurry1 per mill of the amount, the dispersion rotating speed is 1000r/min, the slurry after complete dispersion is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m; then the slurry after sanding is transferred to a dispersion machine, and 200 parts of Al (H) as a binder is added 2 PO 4 ) 3 Preparing the infrared radiation coating from the solution;
obtaining the roller kiln with the infrared radiation function, wherein the full-wavelength integral emissivity of the infrared radiation roller kiln is greater than 0.86 within the working temperature range of 25-900 ℃;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature area of the infrared radiation roller kiln to be 850 ℃, enabling the sagger filled with the cerium carbonate to enter the infrared radiation roller kiln, and enabling the sagger to pass through a preheating area, the high-temperature area and a cooling area, wherein the total content REO of rare earth in the obtained cerium oxide powder is more than 99%, and the ignition loss is less than 0.5%;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln reduces the time from 4 hours to 3.5 hours through the high-temperature zone at the temperature of 850 ℃ in the high-temperature zone of the roller kiln, shortens the time by 12.5 percent, improves the yield of the cerium oxide fired by the infrared radiation roller kiln by 14.29 percent, and saves the energy by 12.5 percent for producing each ton of cerium oxide.
Comparative example 2
On the basis of the above example 1, the preparation method of the infrared radiation material in the step (1) is as follows: 110 parts of CePO 4 And 0.22 part of dispersant BYK190 are added into 110 parts of water to be dispersed at a high speed, 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 rotating speed is 1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m; the slurry after sanding was transferred to a disperser, and 200 parts of Al (H) was added 2 PO 4 ) 3 Preparing the infrared radiation coating from the solution;
obtaining the roller kiln with the infrared radiation function, wherein the full-wavelength integral emissivity of the infrared radiation roller kiln is greater than 0.87 within the working temperature range of 25-900 ℃;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature area of the infrared radiation roller kiln to be 850 ℃, enabling the sagger filled with the cerium carbonate to enter the infrared radiation roller kiln, and enabling the sagger to pass through a preheating area, the high-temperature area and a cooling area, wherein the total content REO of rare earth in the obtained cerium oxide powder is more than 99%, and the ignition loss is less than 0.5%;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln reduces the time from 4 hours to 3.4 hours through the high-temperature zone at the temperature of 850 ℃ in the high-temperature zone of the roller kiln, shortens the time by 15.0 percent, improves the yield of the cerium oxide fired by the infrared radiation roller kiln by 17.65 percent, and saves the energy by 15.0 percent for producing each ton of cerium oxide.
Comparative example 3
On the basis of the above example 1, the preparation method of 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 is added into 110 parts of water to be dispersed at high speed, 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 rotating speed is 1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m; the slurry after sanding was transferred to a disperser and 300 parts of Al (H) was added 2 PO 4 ) 3 Preparing the infrared radiation coating by using the solution;
obtaining the roller kiln with the infrared radiation function, wherein the full-wavelength integral emissivity of the infrared radiation roller kiln is greater than 0.85 at the working temperature of 25-900 ℃;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature area of the infrared radiation roller kiln to be 850 ℃, enabling the sagger filled with the cerium carbonate to enter the infrared radiation roller kiln, and enabling the sagger to pass through a preheating area, the high-temperature area and a cooling area, wherein the total content REO of rare earth in the obtained cerium oxide powder is more than 99%, and the ignition loss is less than 0.5%;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln reduces the time from 4 hours to 3.6 hours through the high-temperature zone at the temperature of 850 ℃ in the high-temperature zone of the roller kiln, shortens the time by 10.0 percent, improves the yield of the cerium oxide fired by the infrared radiation roller kiln by 11.11 percent, and saves the energy by 10.0 percent for producing each ton of cerium oxide.
Comparative example 4
On the basis of the above example 1, the preparation method of 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 into 110 parts of water at a high speedDispersing, wherein 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 dispersion rotating speed is 1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m; transferring the sanded slurry into a dispersion machine, and adding 200 parts of 30% silica sol solution by mass to prepare the infrared radiation coating;
obtaining the roller kiln with the infrared radiation function, wherein the full-wavelength integral emissivity of the infrared radiation roller kiln is greater than 0.86 at the working temperature of 25-900 ℃;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature area of the infrared radiation roller kiln to be 850 ℃, enabling the sagger filled with the cerium carbonate to enter the infrared radiation roller kiln, and enabling the sagger to pass through a preheating area, the high-temperature area and a cooling area, wherein the total content REO of rare earth in the obtained cerium oxide powder is more than 99%, and the ignition loss is less than 0.5%;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln reduces the time from 4 hours to 3.5 hours through the high-temperature zone at the temperature of 850 ℃ in the high-temperature zone of the roller kiln, shortens the time by 12.5 percent, improves the yield of the cerium oxide fired by the infrared radiation roller kiln by 14.29 percent, and saves the energy by 12.5 percent for producing each ton of cerium oxide.
Comparative example 5
On the basis of the above example 1, the preparation method of 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 is added into 110 parts of water to be dispersed at high speed, 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 dispersion rotating speed is 1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m; the slurry after sanding was transferred to a disperser, and 200 parts of Al (H) was added 2 PO 4 ) 3 Preparing the infrared radiation coating by using the solution;
obtaining the roller kiln with the infrared radiation function, wherein the full-wavelength integral emissivity of the infrared radiation roller kiln is greater than 0.86 at the working temperature of 25-900 ℃;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature region of the infrared radiation roller kiln to be 850 ℃, enabling a sagger filled with cerium carbonate to enter the infrared radiation roller kiln, and enabling the sagger to pass through a preheating region, the high-temperature region and a cooling region, wherein the total REO content of rare earth in the obtained cerium oxide powder is more than 99%, and the ignition loss is less than 0.5%;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the temperature of a high-temperature area of the roller kiln is 850 ℃, the time of passing through the high-temperature area is reduced from 4 hours to 3.45 hours, the time is shortened by 13.75 percent, the yield of the cerium oxide fired by the infrared radiation roller kiln is improved by 15.94 percent, and the energy is saved by 13.75 percent for producing each ton of cerium oxide.
Comparative example 6
On the basis of the above example 1, the preparation method of 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 is added into 110 parts of water to be dispersed at high speed, 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 rotating speed is 1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D (90) Less than or equal to 10.0 mu m; the slurry after sanding was transferred to a disperser, and 200 parts of Al (H) was added 2 PO 4 ) 3 Preparing the infrared radiation coating from the solution;
obtaining the roller kiln with the infrared radiation function, wherein the full-wavelength integral emissivity of the infrared radiation roller kiln is greater than 0.86 within the working temperature range of 25-900 ℃;
(2) Preparing cerium oxide: controlling the temperature of a high-temperature area of the infrared radiation roller kiln to be 850 ℃, enabling the sagger filled with the cerium carbonate to enter the infrared radiation roller kiln, and enabling the sagger to pass through a preheating area, the high-temperature area and a cooling area, wherein the total content REO of rare earth in the obtained cerium oxide powder is more than 99%, and the ignition loss is less than 0.5%;
(3) Energy-saving comparative analysis: compared with the conventional cerium oxide roller kiln, the infrared radiation roller kiln has the advantages that the temperature of a high-temperature area of the roller kiln is 850 ℃, the time of passing through the high-temperature area is reduced from 4 hours to 3.55 hours, the time is shortened by 11.25%, the yield of the cerium oxide fired by the infrared radiation roller kiln is improved by 12.68%, and the energy is saved by 11.25% per ton of the cerium oxide produced.
TABLE 1 comparison of the results of examples 1 to 4
TABLE 2 comparison of results of comparative examples 1-6
The comparison shows that the method can obviously realize the energy saving of the cerium oxide tunnel kiln, shorten the time by more than 20 percent through a high-temperature period, improve the yield of the cerium oxide by more than 25 percent, and save the energy by more than 20 percent per ton of the cerium oxide. The infrared radiation material formula provided by the invention is the optimal formula, and CeO is changed 2 、CePO 4 Or the proportion and the variety of the caking agent, the time of the cerium oxide passing through the high-temperature section of the kiln is shortened by less than 20 percent, and the output of the cerium oxide is improved by less than 25 percent. This is because, in the material formulation proposed by the present invention, al (H) 2 PO 4 ) 3 At high temperature with CeO in proper proportion 2 、CePO 4 And the base material reacts to generate a glaze layer with a compact ceramic phase and high emissivity, 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 above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (7)
1. An energy-saving method for a cerium oxide tunnel kiln is characterized by comprising the following steps: the method comprises the following steps:
1) Spraying an infrared radiation material on the surface of the inner cavity of the tunnel kiln, and firing at a high temperature to obtain the tunnel kiln with the infrared radiation function; wherein the infrared radiation material consists of 100 to 200 parts of CeO by weight 2 10-30 parts of CePO 4 And 180-220 parts of solid content of 48% -58% 2 PO 4 ) 3 Solution composition;
2) And putting the sagger filled with the cerium carbonate into an infrared radiation tunnel kiln, and passing through a preheating zone, a high-temperature zone and a cooling zone to obtain the burned cerium oxide powder.
2. The cerium oxide tunnel kiln energy-saving method as claimed in claim 1, wherein: the infrared radiation material is prepared by the following method:
1) Adding CeO 2 、CePO 4 And a dispersant is 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 1-5 per mill of the total amount of the slurry, the dispersing rotating speed is 800-1000r/min, the completely dispersed slurry is transferred to a sand mill for sand grinding until the particle size D is reached (90) ≤10.0μm；
2) Then transferring the slurry after sanding into a dispersion machine, and adding a binder Al (H) 2 PO 4 ) 3 And stirring the solution to obtain the infrared radiation material.
3. The cerium oxide tunnel kiln energy-saving method as claimed in claim 1, wherein: the dispersant is one or a mixture of more than two of BYK190, RT-8040 and RT-8022.
4. The cerium oxide tunnel kiln energy-saving method according to claim 1, wherein: 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 of the inner cavity of the tunnel kiln is cleaned of refractory clay and dust, after spraying, the refractory material is dried at room temperature, the temperature is raised according to the drying program of the tunnel kiln, and the heat is preserved for 2 hours when the highest temperature reaches 1200 ℃.
5. The cerium oxide tunnel kiln energy-saving method according to claim 1, wherein: in the step 2), the temperature of the high-temperature zone of the tunnel kiln is controlled to be generally 850-900 ℃.
6. The cerium oxide tunnel kiln energy-saving method as claimed in claim 1, wherein: the tunnel kiln is a trolley type tunnel kiln or a roller kiln.
7. The cerium oxide tunnel kiln energy-saving method according to claim 1, wherein: the spraying thickness is 0.2-0.4mm.
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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 |
| US20080283171A1 (en) * | 2006-01-11 | 2008-11-20 | Evonik Degussa Gmbh | Ceramic Wall Cladding Composites That Reflect Ir Radiation |
| 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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Patent Citations (6)
| 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 |
| US20080283171A1 (en) * | 2006-01-11 | 2008-11-20 | Evonik Degussa Gmbh | Ceramic Wall Cladding Composites That Reflect Ir Radiation |
| 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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