CN112209739A - Lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic and preparation method thereof - Google Patents
Lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic and preparation method thereof Download PDFInfo
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- hollow sphere
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- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 78
- 239000011029 spinel Substances 0.000 title claims abstract description 78
- 239000011777 magnesium Substances 0.000 title claims abstract description 69
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 69
- -1 magnesium aluminate Chemical class 0.000 title claims abstract description 69
- 239000000919 ceramic Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000004568 cement Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 239000006260 foam Substances 0.000 claims abstract description 16
- 239000003381 stabilizer Substances 0.000 claims abstract description 16
- 239000004088 foaming agent Substances 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims abstract description 8
- 238000005187 foaming Methods 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims description 28
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 229920002401 polyacrylamide Polymers 0.000 claims description 14
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 11
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 7
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 7
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 7
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 7
- 238000013329 compounding Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical group [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 14
- 239000012071 phase Substances 0.000 description 13
- 239000011159 matrix material Substances 0.000 description 8
- 239000000395 magnesium oxide Substances 0.000 description 7
- 235000012245 magnesium oxide Nutrition 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 229910002056 binary alloy Inorganic materials 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011468 face brick Substances 0.000 description 1
- 239000004872 foam stabilizing agent Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 238000009862 microstructural analysis Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009856 non-ferrous metallurgy Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011215 ultra-high-temperature ceramic Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a light high-strength magnesium aluminate spinel hollow sphere porous ceramic and a preparation method thereof. The porous ceramic comprises, by mass, 60-80% of a magnesium aluminate spinel hollow sphere, 16.5-33% of alumina micropowder and 3.5-7% of calcium aluminate cement; in addition, a binding agent, a foaming agent and a foam stabilizer are added. Firstly, adding a prepared foam stabilizer and a foaming agent into a binding agent, stirring and dissolving to obtain a foaming solution; then adding calcium aluminate cement and alumina micro powder, stirring uniformly to obtain foamed slurry, and then adding magnesium aluminate spinel hollow spheres, and stirring uniformly to obtain pug; and (3) casting and molding the obtained pug, maintaining, and demolding to obtain a porous ceramic blank, drying the blank, heating in a high-temperature furnace, and keeping the temperature to obtain the light high-strength magnesium aluminate spinel hollow sphere porous ceramic. Compared with the traditional hollow sphere porous ceramic, the product provided by the invention has the advantages of high strength, low heat conductivity coefficient, good volume stability and suitability for alkaline and ultrahigh temperature environments.
Description
The technical field is as follows:
the invention belongs to the technical field of inorganic chemical industry, and particularly relates to light high-strength magnesium aluminate spinel hollow sphere porous ceramic and a preparation method thereof.
Secondly, background art:
with the economy and societyThe development of society, the energy consumption required by the daily production of society is gradually increased, the non-renewable energy is gradually exhausted, the energy crisis is increasingly serious, and simultaneously, the use requirements of various industrial fields such as steel industry, nonferrous metallurgy industry, building material industry, ultrahigh temperature ceramics, functional materials and the like on the materials are also more severe. Therefore, in order to meet the requirements of the high-temperature industry on material use and reduce the waste of energy, the development of a high-temperature kiln alkaline lining material with light weight, high strength, high refractoriness and low thermal conductivity is urgently needed. The high-temperature heat-insulating hollow ball material commonly used at present is an alumina hollow ball product and a zirconia hollow ball product, and is suitable for acidic or neutral conditions. In addition, the traditional hollow ball product has higher volume density which is 1.4-1.6 g/cm3This results in a high weight and thermal conductivity and a large heat storage.
The strength of the hollow sphere porous ceramic is mainly related to the bonding strength of the matrix to the hollow sphere, the strength of the product is high when the bonding strength of the matrix to the hollow sphere is high, the sample is broken to be broken through the sphere, the strength of the product is low when the bonding strength of the matrix to the hollow sphere is low, and the sample is broken to be broken along the sphere. Suitable matrix compositions can impart high strength to the article without reducing the temperature at which the article is used. The magnesium aluminate spinel has a high melting point (2150 ℃) and a general use temperature of 1600-2000 ℃, and can be used as an alkali-proof heat-insulating layer and a working face brick. In addition, the calcium aluminate cement is a common cement for the current refractory castable, and has the advantages of high refractoriness and high hydration strength. The calcium aluminate cement is matched with alumina powder in a matrix, and calcium hexaluminate (with the melting point of 1875 ℃) is generated after high-temperature sintering, is a high-temperature phase, has good alkali vapor corrosion resistance, and has the advantages of good mechanical property, good thermal shock stability and the like. Therefore, the magnesium aluminate spinel hollow sphere product combined by calcium hexaluminate is an excellent choice for high-temperature heat insulation materials in alkaline environments.
Thirdly, the invention content:
the technical problem to be solved by the invention is as follows: aiming at the problem that the existing market lacks of high-strength low-heat-conduction basic hollow ball products, the invention provides a light high-strength magnesium aluminate spinel hollow ball porous productCeramics and a method for preparing the same. The technical scheme of the invention is that the lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic is prepared by taking magnesium aluminate spinel hollow spheres (the sphere wall is magnesium aluminate spinel phase, the sphere center is periclase phase) as lightweight aggregate, alumina micropowder and calcium aluminate cement as substrates, polyacrylamide solution as a binding agent, sodium dodecyl sulfate as a foaming agent, dodecyl alcohol and sodium carboxymethyl cellulose which are compounded in a certain proportion as foam stabilizers, and mixing, molding, drying and sintering the materials. The addition of the foaming agent further increases the porosity and reduces the volume density; the calcium aluminate cement in the substrate reacts with the alumina micro powder to generate flaky high-temperature-resistant calcium hexaluminate, the bonding strength between the magnesia-alumina spinel hollow spheres and the high-temperature-resistant performance of the substrate are improved, and the main crystal phase MgAlO4And binding phase CA6The temperature of the formed binary system for generating liquid phase can exceed 1800 ℃, and the main crystal phase MgAlO4The temperature of the binary system formed by the MgO and the generated liquid phase can also exceed 1800 ℃, and the binary system is hopeful to be used in the high-temperature resistant alkaline environment with the temperature of more than 2000 ℃. Therefore, the light high-strength magnesium aluminate spinel hollow sphere porous ceramic prepared by the invention has the advantages of light weight, high strength, high temperature resistance, suitability for neutral and alkaline environments and the like.
In order to solve the problems, the invention adopts the technical scheme that:
the invention provides a light high-strength magnesium aluminate spinel hollow sphere porous ceramic which is composed of, by mass, 60-80% of magnesium aluminate spinel hollow spheres, 16.5-33% of alumina micropowder and 3.5-7% of calcium aluminate cement; in addition, a binder polyacrylamide solution accounting for 24-30% of the total weight of the three raw materials, a foaming agent sodium dodecyl sulfate accounting for 0.03-0.05% of the total weight of the three raw materials and a foam stabilizer accounting for 0.03-0.05% of the total weight of the three raw materials are added.
According to the light high-strength magnesium aluminate spinel hollow sphere porous ceramic, the particle size of the magnesium aluminate spinel hollow sphere is 0.5-0.9 mm.
According to the light high-strength magnesium aluminate spinel hollow sphere porous ceramic, the d of the alumina micro powder50It was 2.3 μm.
According to the light-weight high-strength magnesium aluminate spinel hollow sphere porous ceramic, the calcium aluminate cement is Secar71 calcium aluminate cement.
According to the light high-strength magnesium aluminate spinel hollow sphere porous ceramic, the mass percentage concentration of the polyacrylamide solution is 33%.
According to the light high-strength magnesia-alumina spinel hollow sphere porous ceramic, the foam stabilizer is prepared by compounding dodecanol and sodium carboxymethyl cellulose, and the mixing ratio of the dodecanol and the sodium carboxymethyl cellulose in the compounding process is 4: 6.
In addition, a preparation method of the light high-strength magnesium aluminate spinel hollow sphere porous ceramic is provided, and the preparation method comprises the following steps:
a. firstly, preparing various raw materials according to the proportion of the light high-strength magnesia-alumina spinel hollow sphere porous ceramic;
b. adding the prepared foam stabilizer and foaming agent sodium dodecyl sulfate into a binding agent polyacrylamide solution, stirring and dissolving, and uniformly stirring to obtain a foaming solution; then adding calcium aluminate cement and alumina micro powder, uniformly stirring to obtain a foaming slurry, adding the magnesia-alumina spinel hollow sphere, stirring, and uniformly stirring to obtain a pug;
c. pouring the pug obtained in the step b into a mold for casting molding, curing the obtained molded sample in the mold at room temperature for 24 hours, curing at 60 ℃ for 10 hours, and demolding to obtain a magnesium aluminate spinel hollow sphere porous ceramic blank;
d. drying the green body obtained in the step c to obtain a dried green body;
e. heating the dried magnesium aluminate spinel hollow sphere porous ceramic blank obtained in the step d to 1700 ℃ in a high-temperature furnace, and preserving heat for 2-8 h; and then cooling to room temperature along with the furnace to obtain the light high-strength magnesium aluminate spinel hollow sphere porous ceramic.
According to the preparation method of the light high-strength magnesium aluminate spinel hollow sphere porous ceramic, the drying in the step d comprises the following specific steps: and (3) putting the obtained blank into an oven, and drying for 10 hours at the temperature of 110 ℃ to obtain a dried blank.
According to the preparation method of the light high-strength magnesium aluminate spinel hollow sphere porous ceramic, the temperature rise system in the high-temperature furnace in the step e is as follows: the heating rate is controlled to be 3 ℃/min in the process of heating to the temperature of between room temperature and 300 ℃, the heating rate is controlled to be 5 ℃/min in the process of heating to the temperature of between 300 and 1100 ℃, and the heating rate is controlled to be 3 ℃/min in the process of heating to the temperature of between 1100 and 1700 ℃.
The invention has the following positive beneficial effects:
1. according to the technical scheme, the foaming agent and the foam stabilizer are added, and compared with a compact refractory material, the prepared porous ceramic has the characteristics of low volume density, high apparent porosity, heat capacity, low heat conductivity coefficient and good heat insulation.
2. In the technical scheme of the invention, calcium aluminate cement and alumina micropowder are used as matrix materials, and the calcium aluminate cement and the alumina micropowder are proportioned to form a calcium hexaluminate binding phase with a sheet structure at high temperature, so that the normal-temperature strength and the high-temperature strength of the matrix are greatly improved, and simultaneously, the main crystal phase MgAlO is enabled to be4And binding phase CA6The temperature of the formed binary system generating liquid phase is high, and the material is hopeful to be used in alkaline environment with ultrahigh temperature above 2000 ℃. Therefore, compared with the common heat-insulating material, the porous ceramic material has the characteristics of high strength, high use temperature, alkali environment corrosion resistance and the like.
3. In the technical scheme of the invention, the magnesia-alumina spinel hollow sphere contains a magnesia (melting point 2800 ℃) core sphere with the volume of less than 5%, so that the high temperature resistance and the alkali corrosion resistance of the magnesia-alumina spinel hollow sphere can be further ensured.
Fourthly, explanation of the attached drawings:
FIG. 1 is an XRD spectrum of a raw material of magnesium aluminate spinel hollow spheres with different particle sizes;
as shown in figure 1, the main component of the raw material of the magnesium aluminate spinel hollow sphere is MgAlO4And MgO, and the microstructure analysis shows that the main component of the hollow sphere wall is MgAlO4The phase, the inside, is mainly MgO phase small core ball.
FIG. 2 is an XRD (X-ray diffraction) spectrum of the porous ceramic obtained by adding different magnesium aluminate spinel hollow spheres;
a1#, a2#, A3#, a4# and a5# in fig. 2 represent example 1, example 2, example 3, example 4 and example 5, respectively.
As is clear from FIG. 2, the main phases of each sample obtained were MA, MgO and CA6Are high-temperature phases, and microstructural analysis shows that MA is mainly located on the surface of the hollow sphere, MgO is mainly located in the hollow sphere, and CA is mainly located in the matrix6。
The fifth embodiment is as follows:
the invention is further illustrated by the following examples, which do not limit the scope of the invention.
D of the raw alumina fine powder used in the following examples502.3 mu m, the mass percentage concentration of the polyacrylamide solution is 33 percent, the foam stabilizer is formed by compounding dodecanol and sodium carboxymethyl cellulose, and the mixing ratio of the dodecanol and the sodium carboxymethyl cellulose in the compounding process is 4: 6.
Example 1:
the lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic comprises, by mass, 40% of magnesium aluminate spinel hollow spheres with the raw materials of 0.9-0.6 mm, 20% of magnesium aluminate spinel hollow spheres with the raw materials of 0.6-0.5 mm, 33% of alumina micropowder and 7% of Secar71 calcium aluminate cement; in addition, a binder polyacrylamide solution accounting for 24 percent of the total weight of the three raw materials, a foaming agent sodium dodecyl sulfate accounting for 0.043 percent of the total weight of the three raw materials and a foam stabilizer accounting for 0.04 percent of the total weight of the three raw materials are added.
Example 2:
the lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic comprises, by mass, 45% of magnesium aluminate spinel hollow spheres with the size of 0.9-0.6 mm, 20% of magnesium aluminate spinel hollow spheres with the size of 0.6-0.5 mm, 28.87% of alumina micropowder and 6.13% of Secar71 calcium aluminate cement; in addition, a binder polyacrylamide solution accounting for 26 percent of the total weight of the three raw materials, a foaming agent sodium dodecyl sulfate accounting for 0.04 percent of the total weight of the three raw materials and a foam stabilizer accounting for 0.05 percent of the total weight of the three raw materials are added.
Example 3:
the lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic comprises, by mass, 50% of magnesium aluminate spinel hollow spheres with the size of 0.9-0.6 mm, 20% of magnesium aluminate spinel hollow spheres with the size of 0.6-0.5 mm, 24.75% of alumina micropowder and 5.25% of Secar71 calcium aluminate cement; in addition, a binder polyacrylamide solution accounting for 28 percent of the total weight of the three raw materials, a foaming agent sodium dodecyl sulfate accounting for 0.03 percent of the total weight of the three raw materials and a foam stabilizer accounting for 0.04 percent of the total weight of the three raw materials are added.
Example 4:
the lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic comprises, by mass, 55% of magnesium aluminate spinel hollow spheres with the size of 0.9-0.6 mm, 20% of magnesium aluminate spinel hollow spheres with the size of 0.6-0.5 mm, 20.62% of alumina micropowder and 4.38% of Secar71 calcium aluminate cement; in addition, a binder polyacrylamide solution accounting for 30 percent of the total weight of the three raw materials, a foaming agent sodium dodecyl sulfate accounting for 0.05 percent of the total weight of the three raw materials and a foam stabilizer accounting for 0.045 percent of the total weight of the three raw materials are added.
Example 5:
the lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic comprises, by mass, 60% of magnesium aluminate spinel hollow spheres with the size of 0.9-0.6 mm, 20% of magnesium aluminate spinel hollow spheres with the size of 0.6-0.5 mm, 16.5% of alumina micropowder and 3.5% of Secar71 calcium aluminate cement; in addition, a binder polyacrylamide solution accounting for 26 percent of the total weight of the three raw materials, a foaming agent sodium dodecyl sulfate accounting for 0.04 percent of the total weight of the three raw materials and a foam stabilizer accounting for 0.05 percent of the total weight of the three raw materials are added.
The preparation method of the light high-strength magnesium aluminate spinel hollow sphere porous ceramic provided by the embodiment 1-5 of the invention comprises the following steps:
a. firstly, preparing various raw materials according to the proportion of the light high-strength magnesium aluminate spinel hollow sphere porous ceramic in any one of embodiments 1 to 5;
b. adding the prepared foam stabilizer and foaming agent sodium dodecyl sulfate into a binding agent polyacrylamide solution, stirring and dissolving, and uniformly stirring to obtain a foaming solution; then adding calcium aluminate cement and alumina micro powder, uniformly stirring to obtain a foaming slurry, adding the magnesia-alumina spinel hollow sphere, stirring, and uniformly stirring to obtain a pug;
c. pouring the pug obtained in the step b into a mold for casting molding, curing the obtained molded sample in the mold at room temperature for 24 hours, curing at 60 ℃ for 10 hours, and demolding to obtain a magnesium aluminate spinel hollow sphere porous ceramic blank;
d. c, putting the magnesium aluminate spinel hollow sphere porous ceramic blank obtained in the step c into a drying oven, and drying for 10 hours at the temperature of 110 ℃ to obtain a dried blank;
e. heating the dried magnesium aluminate spinel hollow sphere porous ceramic blank obtained in the step d to 1700 ℃ in a high-temperature furnace, wherein the specific process of heating the high-temperature furnace comprises the steps of controlling the heating rate to be 3 ℃/min in the process of heating the temperature to be 300 ℃, controlling the heating rate to be 5 ℃/min in the process of heating the temperature to be 300-1100 ℃, controlling the heating rate to be 3 ℃/min in the process of heating the temperature to be 1100-1700 ℃, and preserving the heat for 6 hours; and then cooling to room temperature along with the furnace to obtain the light high-strength magnesium aluminate spinel hollow sphere porous ceramic.
The relevant physical property parameters of the magnesium aluminate spinel hollow sphere porous ceramic prepared in the embodiments 1-5 are detailed in table 1.
TABLE 1 relevant physical property parameters of the magnesium aluminate spinel hollow sphere porous ceramics prepared in examples 1-5
As can be seen from Table 1, the strength of the magnesium aluminate spinel hollow sphere porous ceramic product prepared by the technical scheme of the invention is 3.97-21.71 MPa, and the bulk density is 0.92-1.14 g/cm3The re-burning line changes near zero, the heat conductivity coefficient at 800 ℃ is 0.342-0.431W/(m.K), and compared with the traditional hollow sphere porous ceramic, the hollow sphere porous ceramic has the advantages of high strength, low density, low heat conductivity coefficient, good volume stability, high temperature resistance, suitability for alkaline environment and the like, and has good comprehensive use effect.
Claims (9)
1. A light high-strength magnesium aluminate spinel hollow sphere porous ceramic is characterized in that: the light high-strength magnesium aluminate spinel hollow sphere porous ceramic comprises, by mass, 60-80% of a magnesium aluminate spinel hollow sphere, 16.5-33% of alumina micropowder and 3.5-7% of calcium aluminate cement; in addition, a binder polyacrylamide solution accounting for 24-30% of the total weight of the three raw materials, a foaming agent sodium dodecyl sulfate accounting for 0.03-0.05% of the total weight of the three raw materials and a foam stabilizer accounting for 0.03-0.05% of the total weight of the three raw materials are added.
2. The lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic of claim 1, wherein: the particle size of the magnesium aluminate spinel hollow sphere is 0.5-0.9 mm.
3. The lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic of claim 1, wherein: d of the alumina micropowder50It was 2.3 μm.
4. The lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic of claim 1, wherein: the calcium aluminate cement is Secar71 calcium aluminate cement.
5. The lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic of claim 1, wherein: the mass percentage concentration of the polyacrylamide solution is 33%.
6. The lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic of claim 1, wherein: the foam stabilizer is prepared by compounding dodecanol and sodium carboxymethylcellulose, wherein the mixing ratio of the dodecanol to the sodium carboxymethylcellulose in the compounding process is 4: 6.
7. A preparation method of the light high-strength magnesium aluminate spinel hollow sphere porous ceramic of claim 1, which is characterized by comprising the following steps:
a. firstly, preparing various raw materials according to the proportioning proportion of the light high-strength magnesia-alumina spinel hollow sphere porous ceramic in the claim 1;
b. adding the prepared foam stabilizer and foaming agent sodium dodecyl sulfate into a binding agent polyacrylamide solution, stirring and dissolving, and uniformly stirring to obtain a foaming solution; then adding calcium aluminate cement and alumina micro powder, uniformly stirring to obtain a foaming slurry, adding the magnesia-alumina spinel hollow sphere, stirring, and uniformly stirring to obtain a pug;
c. pouring the pug obtained in the step b into a mold for casting molding, curing the obtained molded sample in the mold at room temperature for 24 hours, curing at 60 ℃ for 10 hours, and demolding to obtain a magnesium aluminate spinel hollow sphere porous ceramic blank;
d. drying the green body obtained in the step c to obtain a dried green body;
e. heating the dried magnesium aluminate spinel hollow sphere porous ceramic blank obtained in the step d to 1700 ℃ in a high-temperature furnace, and preserving heat for 2-8 h; and then cooling to room temperature along with the furnace to obtain the light high-strength magnesium aluminate spinel hollow sphere porous ceramic.
8. The preparation method of the light-weight high-strength magnesium aluminate spinel hollow sphere porous ceramic according to claim 7, wherein the drying in the step d comprises the following specific steps: and (3) putting the obtained blank into an oven, and drying for 10 hours at the temperature of 110 ℃ to obtain a dried blank.
9. The preparation method of the light high-strength magnesium aluminate spinel hollow sphere porous ceramic according to claim 7, wherein the temperature rise system in the high-temperature furnace in the step e is as follows: the heating rate is controlled to be 3 ℃/min in the process of heating to the temperature of between room temperature and 300 ℃, the heating rate is controlled to be 5 ℃/min in the process of heating to the temperature of between 300 and 1100 ℃, and the heating rate is controlled to be 3 ℃/min in the process of heating to the temperature of between 1100 and 1700 ℃.
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