CN114702299A - Heat storage ceramic produced by dealkalized red mud and preparation method thereof - Google Patents
Heat storage ceramic produced by dealkalized red mud and preparation method thereof Download PDFInfo
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Abstract
The invention provides heat storage ceramic produced by dealkalized red mud and a preparation method thereof. The heat storage ceramic comprises, by weight, 70-80 parts of dealkalized red mud, 5-15 parts of steel slag, 5-10 parts of kaolin, 5-10 parts of fluxing agent and 1-5 parts of modifying agent. The dealkalized red mud, the steel slag, the kaolin, the fluxing agent and the modifier are reasonably proportioned, and the heat storage ceramic is obtained after granulation, ageing, press forming, drying and sintering, so that the invention has the advantages of low cost, high breaking strength, high heat storage density and volume density of more than or equal to 2.5g/cm3And the dealkalized red mud utilization rate is more than or equal to 70 percent, the effective utilization rate of the solid waste red mud is greatly improved, the application field of the red mud is widened, and the dealkalized red mud has great environmental protection significance and economic value.
Description
Technical Field
The invention relates to the field of inorganic nonmetallic materials, in particular to heat storage ceramic produced by dealkalized red mud and a preparation method thereof.
Background
Energy is an important material basis for economic and social development, energy consumption structures are reasonably adjusted on the background that fossil energy is increasingly deficient, and the vigorous development of new energy and renewable energy is an effective way for solving the current energy problem. Therefore, renewable energy sources are produced at the same time, mainly solar energy, wind energy, biomass energy, tidal energy and the like, and as the solar energy has the advantages of large resource amount, wide distribution range, cleanness, no pollution, reliable technology and the like, the solar power generation technology increasingly becomes the key point of the technical development of renewable energy sources in China and even in the world. However, in the process of converting and using solar energy, the contradiction of unmatched supply and demand exists in time and space, and the efficient utilization of solar energy resources is limited.
The energy storage material can realize energy storage, improve energy utilization efficiency, and can well solve the problem of balance of supply and demand of solar energy. The heat storage ceramic has the advantages of good high-temperature stability, chemical corrosion resistance, high density, low cost and the like, and becomes a common heat storage material in a solar thermal power station.
China is a large alumina production country, the amount of red mud byproduct is about 1-2.5 tons per 1 ton of alumina produced, the pH value of the red mud is 12-13, the red mud belongs to strong-alkaline harmful waste residue, and especially Bayer process red mud has the alkali content of more than 10%. The red mud is piled up in large quantity, which not only occupies land and wastes resources, but also easily causes environmental pollution and potential safety hazard. Therefore, the development and utilization of red mud are the subject of research in various industries, and the production of ceramic materials from red mud is also reported. For example, in publication No. CN102173736A, a floor tile ceramic and a method for preparing the floor tile ceramic by using industrial solid wastes, namely phosphogypsum and red mud are provided, the fluidity and thixotropy of slurry are improved by adding a dispersing agent, a ceramic product is prepared by spray drying granulation and pressing firing, the floor tile ceramic with low water absorption and flexural strength meeting the national standard is obtained, and the using amount of the red mud is 10-20%. CN 105693210A discloses a ceramic material produced from red mud and a preparation method thereof, wherein the red mud accounts for 10-70% by mass of a mixed raw material for preparing the ceramic material, 0-60% by mass of clay, 5-35% by mass of a silicon-rich aluminum raw material, 5-40% by mass of a quartz raw material and 0-30% by mass of a magnesium-rich raw material.
However, the utilization rate of the red mud in the above patent is not high (not more than 70% of the raw material), the red mud resource is not fully utilized, and the red mud is not applied to the preparation of the heat storage material at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides the heat storage ceramic produced by the dealkalized red mud and the preparation method thereof, which not only greatly improve the effective utilization rate of the red mud, but also have large volume density, good rupture strength and high heat storage density, and can meet the performance requirements of various heat storage technical devices on heat storage materials.
In order to realize the purpose, the invention adopts the following technical scheme:
the heat storage ceramic produced by using the dealkalized red mud comprises, by weight, 70-80 parts of the dealkalized red mud, 5-15 parts of steel slag, 5-10 parts of kaolin, 5-10 parts of a fluxing agent and 1-5 parts of a modifying agent.
The heat storage density and the ceramic intrinsic density are in one-to-one correspondence, namely, the heat storage density is increased along with the increase of the ceramic intrinsic densityThe heat storage performance is enhanced as the temperature is increased. The dealkalized red mud is prepared by a water washing method, an acid leaching method, a lime method, a salt leaching method and a CO2The alkali content of the leaching solution obtained by the dealkalization methods such as the neutralization method of the three industrial wastes, the biological method and the like <1% of red mud. Compared with the traditional red mud, the dealkalized red mud has the advantages that the free alkali in the dealkalized red mud is obviously reduced, and bubbles generated by volatilization of the free alkali in the heating process are avoided, so that the sintering temperature is reduced along with the increase of the utilization amount of the dealkalized red mud, the intrinsic density of a ceramic material is increased, and the heat storage performance is further improved. In addition, the steel slag mainly comprises calcium, iron, silicon, magnesium and a small amount of oxides of aluminum, manganese, phosphorus and the like, and the intrinsic density of the ceramic sample can be further improved by compounding various elements in the sintering process by utilizing the heavy elements such as ferric oxide with higher content contained in the red mud and the steel slag.
While the heat storage density is increased, the ceramic material has high breaking strength. The kaolin is a mineral composed of kaolinite cluster minerals such as tiny flaky, tubular and laminated minerals, the main mineral components of the kaolin are kaolinite and other minerals such as halloysite, montmorillonite, quartzite and feldspar, and the chemical components of the kaolin contain a large amount of Al2O3、SiO2And a small amount of Fe2O3、TiO2And a trace amount of K2O、Na2O and CaO not only can form a skeleton of a ceramic material, but also belong to alkali metal oxides or alkaline earth metal oxides, have low melting points, play a role of fluxing together with a fluxing agent in the sintering process, ensure that a sample is not easy to over-burn and deform, and a modifier can be converted into a new mineral material in the sintering process to be compounded with kaolin, red mud and steel slag, thereby improving the breaking strength of the sample.
Based on the method, the dealkalized red mud, iron oxide and other components in the steel slag are matched with various mineral components, alkali metal oxides, alkaline earth metal oxides and other raw materials in the kaolin, phase change occurs among the raw materials in the forming process to generate new substances, and the new substances and unreacted raw materials form a ceramic framework, so that the intrinsic density of a ceramic sample is improved along with the increase of the utilization amount of the dealkalized red mud, and the heat storage density is further enhanced. In addition, the dealkalized red mud does not contain free alkali basically, gas volatilization is reduced in the sintering process, the sintering temperature is reduced, and the reduction of the volume density and the breaking strength of the ceramic due to the generation of bubbles is avoided.
Preferably, the chemical components of the dealkalized red mud comprise Fe in percentage by weight2O3 25~55wt%、Al2O3 15~30 wt%、SiO2 5~20 wt%、CaO 1~25 wt%、TiO2 4~15 wt%、Na24-15 wt% of O. Higher content of Fe2O3The oxide containing heavy elements can be compounded with the effective components in the steel slag and kaolin, which is beneficial to improving the mechanical property and the intrinsic density of the ceramic sample, and further enhancing the heat storage density under the condition of higher utilization rate of the red mud.
The melting point of the feldspar materials is about 1100-1300 ℃, the chemical stability is good, and the feldspar materials have a fluxing function when being co-melted with the red mud, the steel slag and the kaolin; the melting point of the talc is lower, and the talc has good fluxing effect at high temperature of about 800 ℃. In the present invention, the flux is preferably at least one of anorthite, potassium feldspar, albite, and talc. These four types of fluxes can effectively lower the sintering temperature.
Preferably, the modifier is fly ash. The coal ash can react with other substances in the raw materials to generate a mullite phase, so that the breaking strength of the ceramic sample is effectively improved.
In addition, the invention also provides a preparation method of the heat storage ceramic produced by the dealkalized red mud, which comprises the following steps:
(1) ball-milling and sieving dealkalized red mud, steel slag, kaolin, a fluxing agent and a modifier respectively to obtain raw material powder;
(2) uniformly mixing the raw material powder in the step (1) to obtain a mixture;
(3) sequentially granulating, ageing, press-forming and drying the mixture obtained in the step (2) to obtain a ceramic blank;
(4) and (4) sintering the ceramic blank obtained in the step (3) to obtain the heat storage ceramic.
Preferably, the rotation speed of the ball milling in the step (1) is 300-600 r/min, the ball milling time is 12-24 h, and the mass ratio of the material balls is 1: 2. The raw materials are subjected to ball milling to reduce the granularity, so that the prepared ceramic material has high density and high strength.
As the mixture powder is not easy to dry press and form, as the optimization of the invention, the binder is added into the mixture before the granulation and the staling are carried out in the step (3), the binder plays a role in wetting and bonding the dry powder,
The mixture powder is better combined, so that the ceramic powder is convenient to granulate, the type of the ceramic powder is not limited, and the PVA solution is used in the application.
Preferably, the pressure forming in the step (3) is 50-200 MPa, and the forming time is 10-60 s.
Preferably, the drying temperature in the step (3) is 80-110 ℃, and the drying time is 12-24 h.
Preferably, the sintering temperature of the sintering in the step (4) is 1200-1400 ℃, and the sintering time is 2-4 h. The red mud and the steel slag contain a large amount of ferric oxide, so that the sintering and forming temperature range is narrow, and ceramic samples are softened and collapsed when the temperature exceeds the range.
In order to control the complete reconstruction of the mineral phase composition in each stage in the sintering process, heating systems in different stages are designed. Preferably, the sintering in step (4) is carried out by a temperature control process comprising: when the temperature is lower than 1000 ℃, the heating rate is 5-10 ℃/min; when the temperature is more than or equal to 1000 ℃, the heating rate is 1-5 ℃/min until the temperature is increased to 1200-1400 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the dealkalized red mud, the steel slag, the kaolin, the fluxing agent and the modifier are reasonably proportioned, and the heat storage ceramic is obtained after granulation, ageing, press forming, drying and sintering, so that the invention has the advantages of low cost, high breaking strength, high heat storage density and volume density of more than or equal to 2.5g/cm 3Can satisfy various requirementsThe performance requirement of heat storage materials in the heat storage technical device, and the dealkalized red mud utilization rate is more than or equal to 70 percent, thereby greatly improving the effective utilization rate of the solid waste red mud, widening the application field of the red mud and having larger environmental protection significance and economic value.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The present invention will be described in detail below by way of examples.
The dealkalized red mud of the embodiment of the application is a strong alkaline byproduct generated in the process of extracting aluminum oxide by a Bayer process, and the alkali content of the leachate obtained by dealkalizing by a water washing method <The dealkalized red mud with the concentration of 1 percent comprises the following chemical components in percentage by mass: fe2O3 25~55wt%、Al2O3 15~30 wt%、SiO2 5~20 wt%、CaO 1~25 wt%、TiO2 4~15 wt%、Na2O 4~15 wt%。
Example 1
The heat storage ceramic produced by using the dealkalized red mud comprises, by weight, 80 parts of the dealkalized red mud, 15 parts of steel slag, 10 parts of kaolin, 10 parts of a fluxing agent and 5 parts of a modifying agent. The heat storage ceramic of the embodiment is prepared by the following steps:
(1) treating raw materials: ball-milling the dealkalized red mud, the steel slag, the kaolin, the fluxing agent and the modifier for 24 hours by using an XGB2 planetary ball mill respectively, wherein the mass ratio of material balls is 1:2, and sieving by using a 100-mesh sieve to prepare powder for later use.
(2) Proportioning and mixing the raw materials: taking 80 parts by mass of dealkalized red mud, 15 parts by mass of steel slag, 10 parts by mass of kaolin, 10 parts by mass of a fluxing agent (the components of the fluxing agent comprise 4 parts by mass of potassium feldspar and 6 parts by mass of albite) and 5 parts by mass of a modifying agent (the modifying agent is fly ash), and carrying out ball milling for 12 hours by using an XGB2 type planetary ball mill to uniformly mix to obtain a mixture, wherein the mass ratio of material balls is 1: 2.
(3) Granulation and staling: and (3) granulating the raw material powder by taking PVA with the concentration of 5wt% as a binder, and then ageing for 24 hours.
(4) Molding: the granulated powder was press-molded (molding pressure was 200MPa, holding pressure was 10 seconds) to obtain a ceramic green compact.
(5) And (3) drying: and (3) drying the formed green body in a drying oven at 110 ℃ for 24 hours to obtain a green body.
(6) And (3) sintering under normal pressure: placing the ceramic blank obtained in the step (5) into an alumina sagger, placing the alumina sagger into a box-type furnace, and carrying out a sintering process in the box-type furnace, wherein the sintering temperature is controlled as follows: when the temperature is lower than 1000 ℃, the heating rate is 10 ℃/min; when the temperature is more than or equal to 1000 ℃, the heating speed is 3 ℃/min, the heating is stopped after the temperature is raised to 1350 ℃, the temperature is preserved for 3h, and then the ceramic is cooled along with the furnace to obtain the heat storage ceramic.
Example 2
The heat storage ceramic produced by using the dealkalized red mud comprises, by weight, 70 parts of the dealkalized red mud, 5 parts of steel slag, 5 parts of kaolin, 5 parts of a fluxing agent and 1 part of a modifying agent. The heat storage ceramic of the embodiment is prepared by the following steps:
(1) raw material treatment: ball-milling the dealkalized red mud, the steel slag, the kaolin, the fluxing agent and the modifier for 24 hours by using an XGB2 planetary ball mill respectively, wherein the mass ratio of material balls is 1:2, and sieving by using a 100-mesh sieve to prepare powder for later use.
(2) Proportioning and mixing the raw materials: taking 70 parts of dealkalized red mud, 5 parts of steel slag, 5 parts of kaolin, 5 parts of fluxing agent (the components of the fluxing agent are anorthite 2 parts and talc 3 parts), 5 parts of modifier (the modifier is fly ash) and uniformly mixing the components for 12 hours by using an XGB2 type planetary ball mill to obtain a mixture, wherein the mass ratio of material balls is 1: 2.
(3) Granulation and staleness: and (3) granulating the raw material powder by taking PVA with the concentration of 5wt% as a binder, and then ageing for 24 hours.
(4) Molding: the granulated powder was press-molded (molding pressure 50MPa, holding pressure 60 s) to obtain a ceramic green compact.
(5) And (3) drying: and (3) drying the molded green body in a drying oven at 80 ℃ for 20 hours to obtain a green body.
(6) And (3) sintering under normal pressure: placing the ceramic blank obtained in the step (5) into an alumina sagger, placing the alumina sagger into a box-type furnace, and carrying out a sintering process in the box-type furnace, wherein the sintering temperature is controlled as follows: when the temperature is lower than 1000 ℃, the heating rate is 5 ℃/min; when the temperature is more than or equal to 1000 ℃, the heating speed is 5 ℃/min, the heating is stopped after the temperature is increased to 1300 ℃, the temperature is kept for 4h, and then the heat storage ceramic is obtained after furnace cooling.
Example 3
The heat storage ceramic produced by using the dealkalized red mud comprises, by weight, 75 parts of the dealkalized red mud, 10 parts of steel slag, 8 parts of kaolin, 8 parts of a fluxing agent and 4 parts of a modifying agent. The heat storage ceramic of the embodiment is prepared by the following steps:
(1) raw material treatment: ball-milling the dealkalized red mud, the steel slag, the kaolin, the fluxing agent and the modifier for 24 hours by using an XGB2 planetary ball mill respectively, wherein the mass ratio of material balls is 1:2, and sieving by using a 100-mesh sieve to prepare powder for later use.
(2) Proportioning and mixing the raw materials: the dealkalized red mud is prepared by taking 75 parts by mass of dealkalized red mud, 10 parts by mass of steel slag, 8 parts by mass of kaolin, 8 parts by mass of fluxing agent (the components of the fluxing agent are 4 parts by mass of albite and 4 parts by mass of talc), 4 parts by mass of modifier (the modifier is fly ash) and uniformly mixing the components for 12 hours by using an XGB2 type planetary ball mill to obtain a mixture, wherein the mass ratio of material balls is 1: 2.
(3) Granulation and staleness: and (3) granulating the raw material powder by taking PVA with the concentration of 5wt% as a binder, and then ageing for 24 hours.
(4) Molding: the granulated powder was subjected to press molding (molding pressure 150MPa, holding pressure 50 s) to obtain a ceramic green compact.
(5) And (3) drying: and (3) drying the molded green body in a drying oven at 100 ℃ for 12h to obtain the green body.
(6) And (3) sintering under normal pressure: placing the ceramic blank obtained in the step (5) into an alumina sagger, placing the alumina sagger into a box-type furnace, and carrying out a sintering process in the box-type furnace, wherein the sintering temperature is controlled as follows: when the temperature is lower than 1000 ℃, the heating rate is 8 ℃/min; when the temperature is more than or equal to 1000 ℃, the heating speed is 1 ℃/min, the heating is stopped after the temperature is raised to 1400 ℃, the temperature is kept for 2h, and then the heat storage ceramic is cooled along with the furnace to obtain the heat storage ceramic.
Example 4
The heat storage ceramic produced by using the dealkalized red mud comprises 77 parts by weight of dealkalized red mud, 11 parts by weight of steel slag, 6 parts by weight of kaolin, 7 parts by weight of a fluxing agent and 3 parts by weight of a modifying agent. The heat storage ceramic of the embodiment is prepared by the following steps:
(1) Raw material treatment: ball-milling the dealkalized red mud, the steel slag, the kaolin, the fluxing agent and the modifier for 24 hours by using an XGB2 planetary ball mill respectively, wherein the mass ratio of material balls is 1:2, and sieving by using a 100-mesh sieve to prepare powder for later use.
(2) Proportioning and mixing the raw materials: taking 77 parts by mass of dealkalized red mud, 11 parts by mass of steel slag, 6 parts by mass of kaolin, 7 parts by mass of a fluxing agent (the components of the fluxing agent are anorthite 2 parts and albite 5 parts), 3 parts by mass of a modifier (the modifier is fly ash), and carrying out ball milling for 12 hours by using an XGB2 type planetary ball mill to uniformly mix to obtain a mixture, wherein the mass ratio of material balls is 1: 2.
(3) Granulation and staling: and (3) granulating the raw material powder by taking PVA with the concentration of 5wt% as a binder, and then ageing for 24 hours.
(4) Molding: the granulated powder was press-molded (molding pressure 120MPa, holding pressure 30 s) to obtain a ceramic green compact.
(5) And (3) drying: and (3) drying the formed green body in a drying oven at 90 ℃ for 22h to obtain the green body.
(6) And (3) sintering under normal pressure: placing the ceramic blank obtained in the step (5) into an alumina sagger, placing the alumina sagger into a box-type furnace, and carrying out a sintering process in the box-type furnace, wherein the sintering temperature is controlled as follows: when the temperature is lower than 1000 ℃, the heating rate is 6 ℃/min; when the temperature is more than or equal to 1000 ℃, the heating speed is 2 ℃/min, the heating is stopped after the temperature is increased to 1200 ℃, the temperature is kept for 2h, and then the heat storage ceramic is cooled along with the furnace to obtain the heat storage ceramic.
Example 5
The heat storage ceramic produced by using the dealkalized red mud comprises, by weight, 72 parts of dealkalized red mud, 6 parts of steel slag, 7 parts of kaolin, 7 parts of a fluxing agent and 2 parts of a modifying agent. The heat storage ceramic of the embodiment is prepared by the following steps:
(1) raw material treatment: ball-milling the dealkalized red mud, the steel slag, the kaolin, the fluxing agent and the modifier for 12 hours (the rotating speed of the ball mill is 300-600 r/min) by using an XGB2 planetary ball mill respectively, wherein the mass ratio of material balls is 1:2, and sieving by using a 100-mesh sieve to prepare powder for later use.
(2) Proportioning and mixing the raw materials: taking 72 parts of dealkalized red mud, 6 parts of steel slag, 7 parts of kaolin, 7 parts of fluxing agent (the components of the fluxing agent are 2 parts of anorthite and 5 parts of albite) and 2 parts of modifying agent (the modifying agent is fly ash) by mass, and ball-milling for 12 hours by using an XGB2 type planetary ball mill to uniformly mix to obtain a mixture, wherein the mass ratio of material balls is 1: 2.
(3) Granulation and staling: and (3) granulating the raw material powder by taking PVA with the concentration of 5wt% as a binder, and then ageing for 24 hours.
(4) Molding: the granulated powder was press-molded (molding pressure 80MPa, holding pressure 20 s) to obtain a ceramic green compact.
(5) And (3) drying: and (3) drying the molded green body in a drying oven at 95 ℃ for 23 hours to obtain a green body.
(6) And (3) sintering under normal pressure: placing the ceramic blank obtained in the step (5) into an alumina sagger, placing the alumina sagger into a box-type furnace, and carrying out a sintering process in the box-type furnace, wherein the sintering temperature is controlled as follows: when the temperature is lower than 1000 ℃, the heating rate is 9 ℃/min; when the temperature is more than or equal to 1000 ℃, the heating speed is 4 ℃/min, the heating is stopped after the temperature is raised to 1250 ℃, the temperature is preserved for 3h, and then the heat storage ceramic is cooled along with the furnace to obtain the heat storage ceramic.
[ Performance test ]
The volume density, the flexural strength and the heat storage density of the heat storage ceramics prepared in the embodiments 1 to 5 of the present invention were tested.
The testing process comprises the following steps: measuring the volume density by using an AUY120 type balance density tester from Shimadzu, Japan according to the Archimedes' drainage principle; testing the flexural strength by using an RGM-4100 type electronic universal testing machine according to a three-point bending method model; the heat storage density of the samples was measured using a microcalorimeter from SETARAM, france. The test data are reported in table 1.
And (3) testing results:
TABLE 1 detection results of the performance of the heat storage ceramics in each example
As can be seen from Table 1, the volume density of the heat storage ceramic prepared by the embodiment of the invention is more than or equal to 2.5g/cm3The fracture strength is more than 80MPa, and the heat storage density is more than 550kJ/kg, which shows that the heat storage ceramic obtained by reasonably proportioning the dealkalized red mud with the content of more than 70 percent, the steel slag, the kaolin, the fluxing agent and the modifier through granulation, ageing, press forming, drying and sintering can meet the performance requirements of heat storage materials in various heat storage technical devices.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. The heat storage ceramic produced by using dealkalized red mud is characterized by comprising, by weight, 70-80 parts of dealkalized red mud, 5-15 parts of steel slag, 5-10 parts of kaolin, 5-10 parts of a fluxing agent and 1-5 parts of a modifying agent.
2. The heat storage ceramic produced by using dealkalized red mud according to claim 1, wherein the chemical components of the dealkalized red mud comprise Fe in percentage by weight2O3 25~55wt%、Al2O3 15~30 wt%、SiO2 5~20 wt%、CaO 1~25 wt%、TiO2 4~15 wt%、Na2O 4~15 wt%。
3. The heat storage ceramic produced by using dealkalized red mud according to claim 1, wherein the fluxing agent is at least one of anorthite, potassium feldspar, albite and talc.
4. The heat storage ceramic produced from dealkalized red mud according to claim 1, wherein the modifier is fly ash.
5. The preparation method of the heat storage ceramic produced by the dealkalized red mud according to any one of claims 1 to 4, which is characterized by comprising the following steps:
(1) Ball-milling and sieving dealkalized red mud, steel slag, kaolin, a fluxing agent and a modifier respectively to obtain raw material powder;
(2) uniformly mixing the raw material powder in the step (1) to obtain a mixture;
(3) sequentially granulating, ageing, press-forming and drying the mixture obtained in the step (2) to obtain a ceramic blank;
(4) and (4) sintering the ceramic blank obtained in the step (3) to obtain the heat storage ceramic.
6. The method for preparing heat storage ceramic by using dealkalized red mud as claimed in claim 5, wherein a binder is added into the mixture before the granulation and staling in the step (3).
7. The preparation method of the heat storage ceramic produced by using the dealkalized red mud according to claim 5, wherein the forming pressure of the press forming in the step (3) is 50-200 MPa, and the forming time is 10-60 s.
8. The preparation method of the heat storage ceramic produced by using the dealkalized red mud according to claim 5, wherein the drying temperature in the step (3) is 80-110 ℃, and the drying time is 12-24 h.
9. The preparation method of the heat storage ceramic produced by using the dealkalized red mud according to claim 5, wherein the sintering temperature of the sintering in the step (4) is 1200-1400 ℃, and the sintering time is 2-4 h.
10. The method for preparing heat storage ceramic by using dealkalized red mud according to claim 9, wherein the sintering temperature control process in the step (4) is as follows: when the temperature is lower than 1000 ℃, the heating rate is 5-10 ℃/min; when the temperature is more than or equal to 1000 ℃, the heating rate is 1-5 ℃/min until the temperature is increased to 1200-1400 ℃.
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