CN113277830A - Non-fired energy-saving heat storage ball and preparation method thereof - Google Patents
Non-fired energy-saving heat storage ball and preparation method thereof Download PDFInfo
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- CN113277830A CN113277830A CN202110588703.0A CN202110588703A CN113277830A CN 113277830 A CN113277830 A CN 113277830A CN 202110588703 A CN202110588703 A CN 202110588703A CN 113277830 A CN113277830 A CN 113277830A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
- C04B28/346—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more phosphates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
- C04B2111/763—High temperatures
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The invention discloses a non-fired energy-saving heat storage ball and a preparation method thereof. A baking-free energy-saving heat storage ball comprises the following raw materials in parts by weight: 30-60 parts of bauxite, 10-40 parts of mullite, 5-30 parts of clay, 1-10 parts of low-sodium alpha-alumina micro powder, 0.1-5 parts of silicon micro powder, 1-15 parts of phosphoric acid, 0.1-10 parts of solid aluminum dihydrogen phosphate and 0.5-1 part of binder. A preparation method of a baking-free energy-saving heat storage ball comprises the following steps: a. weighing 30-60 parts of bauxite, 10-40 parts of mullite, 5-30 parts of clay, 1-10 parts of low-sodium alpha-alumina micro powder, 0.1-5 parts of silicon micro powder, 0.1-10 parts of solid aluminum dihydrogen phosphate and 0.5-1 part of binder, and uniformly mixing; b. adding 0.5-14.5 parts of phosphoric acid, uniformly stirring, and ageing for 24 hours; c. adding 0.5-14.5 parts of phosphoric acid again, and stirring uniformly; d. pressing into ball blank; e. drying and cooling to normal temperature.
Description
Technical Field
The invention belongs to the technical field of heat storage balls, and particularly relates to a non-fired energy-saving heat storage ball.
Background
The heat storage ball is also called a spherical heat storage body, and has the advantages of good thermal shock stability, large heat storage capacity, high strength, easy cleaning, reutilization and the like. The heat storage ball is suitable for heat storage ball combustion systems of gas and non-gas fuel industrial furnaces, is particularly suitable for heat storage type smelting furnaces in non-ferrous metal industry, heat storage type air separation equipment heat storage devices in air separation industry and heat storage type heating furnaces in steel industry, and can also be used as heat storage carriers in heat storage type trolley furnaces, heat storage type electric boilers, heat storage type incinerators and other industries of large forging plants. The aluminum melting furnace is used as main melting equipment in the aluminum processing industry in China, and has the characteristics of large capacity, high working efficiency, simplicity in operation and the like, so that the aluminum melting furnace is widely applied. The heat accumulating balls are frequently exchanged by cold and hot gas in a heat accumulating chamber of the aluminum melting furnace, the temperature of the hot gas can reach about 1000 ℃, the requirement on the thermal shock resistance of the heat accumulating balls is high, and the quality of the thermal shock resistance is closely related to the service life.
At present, the production modes of the heat storage ball comprise two types: firstly, treating alumina powder or high-alumina powder and rolling the treated alumina powder or high-alumina powder into balls in a ball forming mill; secondly, the raw materials are placed in a round ball mould to be extruded and molded under certain pressure. However, the heat storage balls prepared by the two processes can be used only after being sintered at a high temperature of more than 1400 ℃, so that the production cost of the heat storage balls is increased, and a large amount of fuel or electric power is consumed.
The invention patent with the application number of CN201710136201.8 discloses a novel formula of a mechanical pressure heat storage ball. It is composed of the following materials: the composite material comprises a filler, aggregate, clay, PVA and a lubricant, wherein the filler is one or a combination of more of corundum powder, alumina powder and mullite powder, and the aggregate is one or a combination of more of corundum aggregate, alumina aggregate and mullite aggregate. According to the introduction, the formula can adopt a method of mixing raw materials and forming by machine pressing to prepare the heat storage ball, and the density of the novel heat storage ball prepared by the formula is 3.7-3.9g/cm3The service life is 18-20 months, and the heat storage capacity is strong, thus having higher economic value and social value. However, according to another patent of the same applicant filed on the same day with the same patent application No. CN201710135682.0, a novel mechanical-compression heat-storage ball process is disclosed, wherein the raw material and the binder are uniformly mixed according to the formula requirement, then the uniformly mixed material is ball-milled, dried, finally the aggregate and the lubricant are added, the uniformly mixed material is extruded and molded, finally the molded material is placed into a kiln for sintering at 500-600 ℃ liter/hourThe temperature is raised to 1450-1500 ℃, the temperature is kept, and then the ball is cooled to the room temperature, and the density of the prepared novel mechanical pressure heat storage ball body is also 3.7-3.9g/cm3The service life is 18-20 months, and the heat storage capacity is strong. It can be seen that the "mixing raw materials and preparing heat storage balls by machine pressing" described at the time refers to forming heat storage balls by machine pressing, but the final finished product of the heat storage balls by machine pressing still needs to be fired after forming.
The invention patent with the application number of CN200610028809.0 discloses a production process of a high-performance ceramic heat storage ball. The alpha-alumina micro powder and various additives are ground, deironized and dried, then added with adhesive to be formed in a ball forming mill, and finally fired in a high-temperature kiln. However, it has been found that the thermal storage pellets obtained by firing at a high temperature according to a certain temperature rise curve are low in thermal expansion coefficient, excellent in thermal shock resistance, high in mechanical strength, excellent in chemical stability and low in gas permeability.
The invention patent with the application number of CN201310726831.2 discloses a method for manufacturing a heat storage product by using a high-temperature phase change heat storage material. Adding metal silicon powder into fly ash, ball milling, spray granulating, pressing by a press machine or extruding by a mud extruder to obtain a molding material, preparing the molding material into a blank of a porous brick, a heat storage ball or honeycomb ceramic, drying, preserving heat, firing, cooling and sorting the blank. The phase change heat storage of the heat storage product in the phase change process is utilized, and the physical heat absorption and the phase change heat absorption are combined, so that the heat storage product has extra phase change heat storage besides physical heat, and the heat storage capacity and the heat storage efficiency of the heat storage product are improved. It is also mentioned that when the raw material is used for manufacturing the honeycomb ceramic product, the obtained honeycomb ceramic product is compact and has high strength due to the melting and sintering-assisting effect of part of the metal silicon, in fact, according to the experience of the technical personnel in the field, the heat storage ball prepared by the raw material is also formed by melting and sintering-assisting of part of the metal silicon, so that the strength of the honeycomb ceramic product is high, and meanwhile, a silicon oxide protective film is formed, so that the corrosion of FeO to the heat storage product in a high-temperature environment is prevented, the service life of the heat storage product is prolonged, and the service life of the heat storage ball is longer than 5 years. Therefore, the technical scheme still needs to be fired, so that the metal silicon is melted and sintering is assisted, the strength is improved, a silicon oxide protective film is formed, and the service life of a heat storage product is prolonged.
Disclosure of Invention
In order to overcome the defects in the background technology, the invention firstly provides a baking-free energy-saving heat storage ball and secondly provides a preparation method of the baking-free energy-saving heat storage ball.
A baking-free energy-saving heat storage ball comprises the following raw materials in parts by weight: 30-60 parts of bauxite, 10-40 parts of mullite, 5-30 parts of clay, 1-10 parts of low-sodium alpha-alumina micro powder, 0.1-5 parts of silicon micro powder, 1-15 parts of phosphoric acid, 0.1-10 parts of solid aluminum dihydrogen phosphate and 0.5-1 part of binder.
Further, the bauxite grading is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, bauxite with the thickness of 3-1mm, bauxite with the thickness of 1-0.074mm, bauxite with the thickness of less than 0.074mm are (10-30), (5-25) and (5-25); in bauxite, Al2O3The content of (B) is more than 70 wt%.
Further, the mullite gradation is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, 3-1mm mullite, 1-0.074mm mullite, less than 0.074mm mullite is (5-30), 1-15 and 1-15; in mullite, Al2O3The content of (B) is more than 45 wt%.
Further, the particle size of the low-sodium alpha-alumina fine powder is 2 to 5 μm.
Further, the particle size of the fine silica powder is 0.1 to 1.5 μm.
Further, the mass concentration of the phosphoric acid is 30-70%.
Further, the binder is polyvinyl alcohol or sodium silicate.
A preparation method of a baking-free energy-saving heat storage ball comprises the following steps: a. weighing 30-60 parts of bauxite, 10-40 parts of mullite, 5-30 parts of clay, 1-10 parts of low-sodium alpha-alumina micro powder, 0.1-5 parts of silicon micro powder, 0.1-10 parts of solid aluminum dihydrogen phosphate and 0.5-1 part of binder, and uniformly mixing; b. adding 0.5-14.5 parts of phosphoric acid, uniformly stirring, and ageing for 24 hours; c. adding 0.5-14.5 parts of phosphoric acid again, and stirring uniformly; d. pressing into ball blank; e. drying and cooling to normal temperature.
Further, in step d, a 350 ton press is used for pressing into the spherical blank.
Further, in step e, the drying temperature is 350-500 ℃, and the drying time is 5 hours.
Compared with the prior art, the invention has the following beneficial effects.
1. As known to those skilled in the art, in the technical field of ceramic compositions, generally, the performance of a sintered product is better than that of a product pressed by a bonding machine, because the internal microstructure and the crystal phase of a material change during a high-temperature sintering process, and the change tends to be finally expressed as the homogenization of the product, and the compactness, the thermal shock property and other properties of the product are improved. In the technical scheme disclosed by the application, although each particle material is a conventional material, as a combination, the combination of mullite and bauxite in various particle sizes can improve the thermal shock stability, the addition of the low-sodium alpha-alumina micro powder and the silicon micro powder obviously improves the forming performance, and the phosphoric acid and the solid aluminum dihydrogen phosphate improve the medium-low temperature strength of the heat storage ball. The service life is 22-25 months, which is obviously beyond the experience and expectation of the technicians in the field.
2. The used process is a sintering-free machine pressing process, the energy consumption per ton is about 250 kW.h, and compared with the traditional machine pressing forming and final sintering process, the energy consumption is obviously reduced, and the ton consumption is reduced by about 1350-.
Detailed Description
The present invention is described below with reference to specific embodiments, and it should be noted that the embodiments are only illustrative and not restrictive of the present invention, and the technical solutions obtained by simple combination and replacement based on the present invention all fall into the protection scope of the present invention.
The components used in the examples and the parts by weight of the components are shown in Table 1 at the end of the document, and the physical and chemical indexes of the products obtained in the examples are shown in Table 2.
Example 1
A baking-free energy-saving heat storage ball comprises the following raw materials in parts by weight: 30 parts of bauxite, 40 parts of mullite, 5 parts of clay and 10 parts of
Low-sodium alpha-alumina micro powder, 0.1 part of silicon micro powder, 15 parts of phosphoric acid, 0.1 part of solid aluminum dihydrogen phosphate and 1 part of binder.
Further, the bauxite grading is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, bauxite with the thickness of 3-1mm, bauxite with the thickness of 1-0.074mm, bauxite with the thickness of less than 0.074mm are 10:25: 5; in bauxite, Al2O3The content of (B) is 70 wt%.
Further, the mullite gradation is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, the mass ratio of 3-1mm mullite to 1-0.074mm mullite to less than 0.074mm is 30:1: 15; in mullite, Al2O3The content of (B) is 45 wt%.
Further, the particle size of the low-sodium alpha-alumina fine powder is 2 to 5 μm.
Further, the particle size of the fine silica powder is 0.1 to 1.5 μm.
Further, the mass concentration of phosphoric acid was 30%.
Further, the binder is polyvinyl alcohol.
A preparation method of a baking-free energy-saving heat storage ball comprises the following steps: a. weighing 30 parts of bauxite, 40 parts of mullite, 5 parts of clay, 10 parts of low-sodium alpha-alumina micro powder, 0.1 part of silicon micro powder, 0.1 part of solid aluminum dihydrogen phosphate and 1 part of binder, and uniformly mixing; b. adding 0.5 part of phosphoric acid, stirring uniformly, and ageing for 24 hours; c. adding 14.5 parts of phosphoric acid again, and stirring uniformly; d. pressing into ball blank; e. drying and cooling to normal temperature.
Further, in step d, a 350 ton press is used for pressing into the spherical blank.
Further, in step e, the drying temperature was 350 ℃ and the drying time was 5 hours.
Example 2
A baking-free energy-saving heat storage ball comprises the following raw materials in parts by weight: 60 parts of bauxite, 10 parts of mullite, 30 parts of clay, 1 part of low-sodium alpha-alumina micro powder, 5 parts of silicon micro powder, 1 part of phosphoric acid, 10 parts of solid aluminum dihydrogen phosphate and 0.5 part of a binder.
Further, the bauxite grading is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, the ratio of bauxite of 3-1mm to bauxite of 1-0.074mm to bauxite of less than 0.074mm is 30:5: 25; in bauxite, Al2O3The content of (B) is 75 wt%.
Further, the mullite gradation is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, 3-1mm of mullite, 1-0.074mm of mullite and less than 0.074mm of mullite are 5:15: 1; in mullite, Al2O3The content of (B) is 72 wt%.
Further, the particle size of the low-sodium alpha-alumina fine powder is 2 to 5 μm.
Further, the particle size of the fine silica powder is 0.1 to 1.5 μm.
Further, the mass concentration of phosphoric acid was 70%.
Further, the binder is sodium silicate.
A preparation method of a baking-free energy-saving heat storage ball comprises the following steps: a. weighing 60 parts of bauxite, 10 parts of mullite, 30 parts of clay, 1 part of low-sodium alpha-alumina micro powder, 5 parts of silicon micro powder, 10 parts of solid aluminum dihydrogen phosphate and 0.5 part of binder, and uniformly mixing; b. adding 0.5 part of phosphoric acid, stirring uniformly, and ageing for 24 hours; c. adding 0.5 part of phosphoric acid again, and stirring uniformly; d. pressing into ball blank; e. drying and cooling to normal temperature.
Further, in step d, a 350 ton press is used for pressing into the spherical blank.
Further, in step e, the drying temperature was 500 ℃ and the drying time was 5 hours.
Example 3
A baking-free energy-saving heat storage ball comprises the following raw materials in parts by weight: 40 parts of bauxite, 20 parts of mullite, 10 parts of clay, 3 parts of low-sodium alpha-alumina micro powder, 1 part of silicon micro powder, 15 parts of phosphoric acid, 7 parts of solid aluminum dihydrogen phosphate and 0.8 part of binder.
Further, the bauxite grading is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, bauxite with the thickness of 3-1mm, bauxite with the thickness of 1-0.074mm, bauxite with the thickness of less than 0.074mm are 10:10: 20; in bauxite, Al2O3The content of (B) is 80 wt%.
Further, the mullite gradation is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, the mass ratio of 3-1mm mullite to 1-0.074mm mullite to less than 0.074mm is 5:10: 5; in mullite, Al2O3The content of (B) is 78 wt%.
Further, the particle size of the low-sodium alpha-alumina fine powder is 2 to 5 μm.
Further, the particle size of the fine silica powder is 0.1 to 1.5 μm.
Further, the mass concentration of phosphoric acid was 50%.
Further, the binder is polyvinyl alcohol.
A preparation method of a baking-free energy-saving heat storage ball comprises the following steps: a. weighing 40 parts of bauxite, 20 parts of mullite, 10 parts of clay, 3 parts of low-sodium alpha-alumina micro powder, 1 part of silicon micro powder, 7 parts of solid aluminum dihydrogen phosphate and 0.8 part of binder, and uniformly mixing; b. adding 14.5 parts of phosphoric acid, uniformly stirring, and ageing for 24 hours; c. adding 0.5 part of phosphoric acid again, and stirring uniformly; d. pressing into ball blank; e. drying and cooling to normal temperature.
Further, in step d, a 350 ton press is used for pressing into the spherical blank.
Further, in step e, the drying temperature was 400 ℃ and the drying time was 5 hours.
Example 4
A baking-free energy-saving heat storage ball comprises the following raw materials in parts by weight: 50 parts of bauxite, 30 parts of mullite, 20 parts of clay, 5 parts of low-sodium alpha-alumina micro powder, 5 parts of silicon micro powder, 6 parts of phosphoric acid, 5 parts of solid aluminum dihydrogen phosphate and 1 part of binder.
Further, the bauxite grading is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, bauxite with the thickness of 3-1mm, bauxite with the thickness of 1-0.074mm, bauxite with the thickness of less than 0.074mm are 20:10: 20; in bauxite, Al2O3The content of (B) is 85 wt%.
Further, the mullite gradation is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, the mass ratio of 3-1mm mullite to 1-0.074mm mullite to less than 0.074mm is 10:10: 10; in mullite, Al2O3The content of (B) is 75 wt%.
Further, the particle size of the low-sodium alpha-alumina fine powder is 2 to 5 μm.
Further, the particle size of the fine silica powder is 0.1 to 1.5 μm.
Further, the mass concentration of phosphoric acid was 60%.
Further, the binder is sodium silicate.
A preparation method of a baking-free energy-saving heat storage ball comprises the following steps: a. weighing 50 parts of bauxite, 30 parts of mullite, 20 parts of clay, 5 parts of low-sodium alpha-alumina micro powder, 5 parts of silicon micro powder, 5 parts of solid aluminum dihydrogen phosphate and 1 part of binder, and uniformly mixing; b. adding 4 parts of phosphoric acid, uniformly stirring, and ageing for 24 hours; c. adding 2 parts of phosphoric acid again, and uniformly stirring; d. pressing into ball blank; e. drying and cooling to normal temperature.
Further, in step d, a 350 ton press is used for pressing into the spherical blank.
Further, in step e, the drying temperature was 400 ℃ and the drying time was 5 hours.
Example 5
A baking-free energy-saving heat storage ball comprises the following raw materials in parts by weight: 47 parts of bauxite, 30 parts of mullite, 10 parts of clay, 5 parts of low-sodium alpha-alumina micro powder, 3 parts of silicon micro powder, 6 parts of phosphoric acid, 5 parts of solid aluminum dihydrogen phosphate and 0.5 part of a binder.
Further, the bauxite grading is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, bauxite with the thickness of 3-1mm, bauxite with the thickness of 1-0.074mm, bauxite with the thickness of less than 0.074mm are 15:10: 22; in bauxite, Al2O3The content of (B) is 88 wt%.
Further, the mullite gradation is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, the mass ratio of 3-1mm mullite to 1-0.074mm mullite to less than 0.074mm is 15:10: 5; in mullite, Al2O3The content of (B) is 76 wt%.
Further, the particle size of the low-sodium alpha-alumina fine powder is 2 to 5 μm.
Further, the particle size of the fine silica powder is 0.1 to 1.5 μm.
Further, the mass concentration of phosphoric acid was 60%.
Further, the binder is polyvinyl alcohol.
A preparation method of a baking-free energy-saving heat storage ball comprises the following steps: a. weighing 47 parts of bauxite, 30 parts of mullite, 10 parts of clay, 5 parts of low-sodium alpha-alumina micro powder, 3 parts of silicon micro powder, 5 parts of solid aluminum dihydrogen phosphate and 0.5 part of binder, and uniformly mixing; b. adding 4 parts of phosphoric acid, uniformly stirring, and ageing for 24 hours; c. adding 2 parts of phosphoric acid again, and uniformly stirring; d. pressing into ball blank; e. drying and cooling to normal temperature.
Further, in step d, a 350 ton press is used for pressing into the spherical blank.
Further, in step e, the drying temperature was 400 ℃ and the drying time was 5 hours.
Example 6
A baking-free energy-saving heat storage ball comprises the following raw materials in parts by weight: 60 parts of bauxite, 25 parts of mullite, 15 parts of clay, 7 parts of low-sodium alpha-alumina micro powder, 3 parts of silicon micro powder, 6 parts of phosphoric acid, 5 parts of solid aluminum dihydrogen phosphate and 1 part of binder.
Further, the bauxite grading is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, bauxite with the thickness of 3-1mm, bauxite with the thickness of 1-0.074mm, bauxite with the thickness of less than 0.074mm are 25:15: 20; in bauxite, Al2O3The content of (B) is 85 wt%.
Further, the mullite gradation is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, the mass ratio of 3-1mm mullite to 1-0.074mm mullite to less than 0.074mm is 5:5: 15; in mullite, Al2O3The content of (B) is 74 wt%.
Further, the particle size of the low-sodium alpha-alumina fine powder is 2 to 5 μm.
Further, the particle size of the fine silica powder is 0.1 to 1.5 μm.
Further, the mass concentration of phosphoric acid was 60%.
Further, the binder is sodium silicate.
A preparation method of a baking-free energy-saving heat storage ball comprises the following steps: a. weighing 60 parts of bauxite, 25 parts of mullite, 15 parts of clay, 7 parts of low-sodium alpha-alumina micro powder, 3 parts of silicon micro powder, 5 parts of solid aluminum dihydrogen phosphate and 1 part of binder, and uniformly mixing; b. adding 4 parts of phosphoric acid, uniformly stirring, and ageing for 24 hours; c. adding 2 parts of phosphoric acid again, and uniformly stirring; d. pressing into ball blank; e. drying and cooling to normal temperature.
Further, in step d, a 350 ton press is used for pressing into the spherical blank.
Further, in step e, the drying temperature was 400 ℃ and the drying time was 5 hours.
Comparative example 1
In the comparative example, various raw materials in example 3 are used, but in the preparation process, after being pressed into a ball blank by a 350-ton press machine, the ball blank is sintered at high temperature, namely, the temperature is kept at 1450 ℃ for 5 hours, and the obtained product has the following physical and chemical properties: density 3.70g/cm3The compression strength is 5167N/particle, the water-cooling thermal shock frequency is 18 times, the energy consumption is 1800 kW.h/ton, and the service life is 15 months.
TABLE 1 parts by weight of the components of examples 1-6
TABLE 2 physicochemical indices of the products of examples 1-6
Claims (10)
1. A baking-free energy-saving heat storage ball is characterized in that: the feed comprises the following raw materials in parts by weight: 30-60 parts of bauxite, 10-40 parts of mullite, 5-30 parts of clay, 1-10 parts of low-sodium alpha-alumina micro powder, 0.1-5 parts of silicon micro powder, 1-15 parts of phosphoric acid, 0.1-10 parts of solid aluminum dihydrogen phosphate and 0.5-1 part of binder.
2. The baking-free energy-saving heat storage ball of claim 1, wherein: the bauxite grading is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio of the components,bauxite of 3-1mm, bauxite of 1-0.074mm, bauxite of less than 0.074mm = (10-30): (5-25): 5-25); in bauxite, Al2O3The content of (B) is more than 70 wt%.
3. The baking-free energy-saving heat storage ball of claim 1, wherein: the mullite composition is as follows: 3-1mm, 1-0.074mm and less than 0.074 mm; according to the mass ratio, 3-1mm of mullite, 1-0.074mm of mullite, less than 0.074mm of mullite = (5-30), 1-15 and 1-15; in mullite, Al2O3The content of (B) is more than 45 wt%.
4. The baking-free energy-saving heat storage ball of claim 1, wherein: the particle size of the low-sodium alpha-alumina micro powder is 2-5 mu m.
5. The baking-free energy-saving heat storage ball of claim 1, wherein: the particle size of the silicon micropowder is 0.1-1.5 μm.
6. The baking-free energy-saving heat storage ball of claim 1, wherein: the mass concentration of the phosphoric acid is 30-70%.
7. The baking-free energy-saving heat storage ball of claim 1, wherein: the binder is polyvinyl alcohol or sodium silicate.
8. The preparation method of the baking-free energy-saving heat storage ball of claim 1, which is characterized by comprising the following steps of: the method comprises the following steps:
a. weighing 30-60 parts of bauxite, 10-40 parts of mullite, 5-30 parts of clay, 1-10 parts of low-sodium alpha-alumina micro powder, 0.1-5 parts of silicon micro powder, 0.1-10 parts of solid aluminum dihydrogen phosphate and 0.5-1 part of binder, and uniformly mixing;
b. adding 0.5-14.5 parts of phosphoric acid, uniformly stirring, and ageing for 24 hours;
c. adding 0.5-14.5 parts of phosphoric acid again, and stirring uniformly;
d. pressing into ball blank;
e. drying and cooling to normal temperature.
9. The preparation method of the baking-free energy-saving heat storage ball of claim 9, wherein the preparation method comprises the following steps: in the step d, a 350-ton press is used when the ball blank is formed by pressing.
10. The preparation method of the baking-free energy-saving heat storage ball of claim 9, wherein the preparation method comprises the following steps: in the step e, the drying temperature is 350-.
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