CN113185310A - Aluminum-silicon castable added with floating beads and preparation method thereof - Google Patents
Aluminum-silicon castable added with floating beads and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an aluminum-silicon castable added with floating beads and a preparation method thereof, wherein the aluminum-silicon castable comprises the following raw materials in parts by weight: the calcium aluminate cement accounts for 30-46%, the silicon micropowder accounts for 1-6%, the perlite aggregate accounts for 40-45%, the sinking bead accounts for 3-8%, and the floating bead accounts for 0-16%. The aluminum-silicon castable added with floating beads and the preparation method thereof have the advantages that light perlite is used as aggregate, fine particles such as silicon micropowder and sinking beads are added, a proper amount of floating beads are added to obviously improve the heat conductivity coefficient, the floating beads have small volume weight, the spheres are more beneficial to the increase of the fluidity among castable raw materials, the floating beads have large specific surface area and high reaction activity in the castable, are beneficial to improving the combination among the raw materials, improve the strength and the volume density, and can form a uniform gas phase connection structure with the light porous perlite, so the heat conductivity is reduced, and the heat preservation effect is improved.
Description
Technical Field
The invention relates to the field of aluminum-silicon castable, in particular to an aluminum-silicon castable added with floating beads and a preparation method thereof.
Background
The aluminum-silicon castable is a multipurpose material, the research on floating beads in China is relatively late compared with the foreign starting, and on the basis of referring to foreign documents, the research and development of China in the aspect are greatly improved, particularly on the unshaped refractory castable, the hollow floating beads and the fly ash belong to homologous substances, and the hollow floating beads and the fly ash are multipurpose materials, are applied to the refractory castable and have excellent heat resistance, heat insulation, insulation and other properties, and the light castable produced by the floating beads produced by the fly ash has better use and construction performance compared with the castable produced by the traditional method, and along with the continuous development of science and technology, the requirements of people on the manufacturing process of the aluminum-silicon castable are higher and higher.
The existing aluminum-silicon castable has certain defects in use, such as high heat conductivity coefficient, large specific gravity, non-uniform structure, low strength and poor heat insulation, is not beneficial to use of people, and brings certain adverse effects to the use process of people.
Disclosure of Invention
The invention mainly aims to provide an aluminum-silicon castable added with floating beads and a preparation method thereof, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
an aluminum-silicon castable added with floating beads and a preparation method thereof comprise the following raw materials in parts by weight: the calcium aluminate cement accounts for 30-46%, the silicon micropowder accounts for 1-6%, the perlite aggregate accounts for 40-45%, the sinking bead accounts for 3-8%, and the floating bead accounts for 0-16%.
As a preferable technical scheme, the content of the calcium aluminate cement is 46 percent, the content of the silicon micropowder is 4 percent, the content of the perlite aggregate is 44 percent, the content of the sinking beads is 6 percent, the content of the floating beads is 0, the normal-temperature compressive strength is 4.1MPa, the linear change rate after the heat treatment at 110 ℃ is 0.02 percent, and the volume density is 0.67g/cm3Apparent porosity11.80 percent and the room temperature thermal conductivity is 0.65W/mK.
As a preferable technical scheme, the content of the calcium aluminate cement is 42 percent, the content of the silicon micropowder is 4 percent, the content of the perlite aggregate is 44 percent, the content of the sinking beads is 6 percent, the content of the floating beads is 4 percent, the normal-temperature compressive strength is 3.5MPa, the linear change rate after the heat treatment at 110 ℃ is 0.01 percent, and the volume density is 0.64g/cm3The apparent porosity is 11.95%, and the room-temperature thermal conductivity is 0.55W/mK.
As a preferable technical scheme, the content of the calcium aluminate cement is 38 percent, the content of the silicon micropowder is 4 percent, the content of the perlite aggregate is 44 percent, the content of the sinking beads is 6 percent, the content of the floating beads is 8 percent, the normal-temperature compressive strength is 2.3MPa, the linear change rate after the heat treatment at 110 ℃ is 0.01 percent, and the volume density is 0.55g/cm3The apparent porosity is 12.80 percent, and the room-temperature thermal conductivity is 0.50W/mK.
As a preferable technical scheme, the content of the calcium aluminate cement is 34 percent, the content of the silicon micropowder is 4 percent, the content of the perlite aggregate is 42 percent, the content of the sinking beads is 4 percent, the content of the floating beads is 16 percent, the normal-temperature compressive strength is 1.6MPa, the linear change rate after the heat treatment at 110 ℃ is-0.01 percent, and the volume density is 0.51g/cm3The apparent porosity was 13.10%, and the thermal conductivity at room temperature was 0.46W/mK.
A preparation method of an aluminum-silicon castable added with floating beads comprises the following operation steps:
s1: preparation of materials: selecting a certain amount of calcium aluminate cement, wherein the calcium aluminate cement is cement taking calcium monoaluminate or calcium dialuminate as a main mineral component for later use; selecting a certain amount of sinking beads for later use, selecting a certain amount of silicon micropowder, and selecting a certain amount of perlite aggregate, wherein the perlite aggregate is acidic lava erupted from volcano, and is vitreous rock formed by rapid cooling, and is light aggregate;
s2: preparing floating beads: selecting a certain amount of floating beads, wherein the floating beads are fly ash hollow spheres capable of floating on the water surface, are offwhite, have thin and hollow walls and light weight and are reserved;
s3: mixing materials: mixing the above materials at a certain ratio, adding into a stirrer, adding water, and stirring for 5min to obtain slurry;
s4: molding: pouring the slurry into the triple die in sequence, placing the triple die on a vibration table for vibration, vibrating the slurry in the triple die while flattening, and vibrating for 8min for forming;
s5: demolding: naturally curing the casting material at room temperature for 24h after molding, demolding, and drying at 110 ℃ for 24 h;
s6: and (3) testing: taking out the material after heat treatment, cooling to room temperature, firstly measuring the volume density, linear change rate and apparent porosity, and then testing the compressive strength of the sample, wherein in order to reduce experimental errors, the average value of experimental results is taken as the final result.
As a preferable technical scheme, different amounts of floating beads are sequentially added in the step S3 to carry out comparison experiments.
Compared with the prior art, the invention has the following beneficial effects: the aluminum-silicon castable added with floating beads and the preparation method thereof have the advantages that light perlite is used as aggregate, fine particles such as silicon micropowder and sinking beads are added, the heat conductivity coefficient can be obviously improved by adding a proper amount of floating beads, the volume weight of the floating beads is small, the increase of fluidity among castable raw materials is facilitated due to the spherical shape, the improvement of a better heat insulation effect on the castable is realized, the adding amount of the floating beads is adjusted, the adding amount of calcium aluminate cement is reduced, the high-strength low-conductivity is obtained, the aluminum-silicon castable meeting the industrial standard is reduced, the heat conductivity of the castable is reduced, the strength of the castable is improved, the particle size of the floating beads is small, the flow-assisting effect is realized in the aluminum-silicon castable, the water consumption is reduced, the light aggregate and the light floating beads are added, the volume density of the aluminum-silicon castable can be reduced, and the using effect is better compared with the traditional mode.
Detailed Description
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The first embodiment is as follows:
an aluminum-silicon castable added with floating beads and a preparation method thereof comprise the following raw materials in parts by weight: 30-46 percent of calcium aluminate cement, 1-6 percent of silicon micropowder, 40-45 percent of perlite aggregate, 3-8 percent of sinking beads and 0-16 percent of floating beads.
The content of calcium aluminate cement is 46 percent, the content of silicon micropowder is 4 percent, the content of perlite aggregate is 44 percent, the content of settled beads is 6 percent, the content of floating beads is 0, the normal-temperature compressive strength is 4.1MPa, the linear change rate after heat treatment at 110 ℃ is 0.02 percent, and the volume density is 0.67g/cm3The apparent porosity is 11.80%, and the room-temperature thermal conductivity is 0.65W/mK.
A preparation method of an aluminum-silicon castable added with floating beads comprises the following operation steps:
s1: preparation of materials: selecting a certain amount of calcium aluminate cement, wherein the calcium aluminate cement is cement taking calcium monoaluminate or calcium dialuminate as a main mineral component for later use; selecting a certain amount of sinking beads for later use, selecting a certain amount of silicon micropowder, and selecting a certain amount of perlite aggregate, wherein the perlite aggregate is acidic lava erupted from volcano, and is vitreous rock formed by rapid cooling, and is light aggregate;
s2: preparing floating beads: selecting a certain amount of floating beads, wherein the floating beads are fly ash hollow spheres capable of floating on the water surface, are offwhite, have thin and hollow walls and light weight and are reserved;
s3: mixing materials: mixing the above materials at a certain ratio, adding into a stirrer, adding water, and stirring for 5min to obtain slurry;
s4: molding: pouring the slurry into the triple die in sequence, placing the triple die on a vibration table for vibration, vibrating the slurry in the triple die while flattening, and vibrating for 8min for forming;
s5: demolding: naturally curing the casting material at room temperature for 24h after molding, demolding, and drying at 110 ℃ for 24 h;
s6: and (3) testing: taking out the material after heat treatment, cooling to room temperature, firstly measuring the volume density, linear change rate and apparent porosity, and then testing the compressive strength of the sample, wherein in order to reduce experimental errors, the average value of experimental results is taken as the final result.
Different amounts of floating beads are added in sequence in the step S3 for comparison experiment.
Example two:
on the basis of the first embodiment, the aluminum-silicon castable added with floating beads and the preparation method thereof comprise the following raw materials in parts by weight: 30-46 percent of calcium aluminate cement, 1-6 percent of silicon micropowder, 40-45 percent of perlite aggregate, 3-8 percent of sinking beads and 0-16 percent of floating beads.
The content of calcium aluminate cement is 42 percent, the content of silicon micropowder is 4 percent, the content of perlite aggregate is 44 percent, the content of settled beads is 6 percent, the content of floating beads is 4 percent, the normal-temperature compressive strength is 3.5MPa, the linear change rate after heat treatment at 110 ℃ is 0.01 percent, and the volume density is 0.64g/cm3The apparent porosity is 11.95%, and the room-temperature thermal conductivity is 0.55W/mK.
A preparation method of an aluminum-silicon castable added with floating beads comprises the following operation steps:
s1: preparation of materials: selecting a certain amount of calcium aluminate cement, wherein the calcium aluminate cement is cement taking calcium monoaluminate or calcium dialuminate as a main mineral component for later use; selecting a certain amount of sinking beads for later use, selecting a certain amount of silicon micropowder, and selecting a certain amount of perlite aggregate, wherein the perlite aggregate is acidic lava erupted from volcano, and is vitreous rock formed by rapid cooling, and is light aggregate;
s2: preparing floating beads: selecting a certain amount of floating beads, wherein the floating beads are fly ash hollow spheres capable of floating on the water surface, are offwhite, have thin and hollow walls and light weight and are reserved;
s3: mixing materials: mixing the above materials at a certain ratio, adding into a stirrer, adding water, and stirring for 5min to obtain slurry;
s4: molding: pouring the slurry into the triple die in sequence, placing the triple die on a vibration table for vibration, vibrating the slurry in the triple die while flattening, and vibrating for 8min for forming;
s5: demolding: naturally curing the casting material at room temperature for 24h after molding, demolding, and drying at 110 ℃ for 24 h;
s6: and (3) testing: taking out the material after heat treatment, cooling to room temperature, firstly measuring the volume density, linear change rate and apparent porosity, and then testing the compressive strength of the sample, wherein in order to reduce experimental errors, the average value of experimental results is taken as the final result.
Different amounts of floating beads are added in sequence in the step S3 for comparison experiment.
Example three:
on the basis of the second embodiment, the aluminum-silicon castable added with floating beads and the preparation method thereof comprise the following raw materials in parts by weight: 30-46 percent of calcium aluminate cement, 1-6 percent of silicon micropowder, 40-45 percent of perlite aggregate, 3-8 percent of sinking beads and 0-16 percent of floating beads.
38 percent of calcium aluminate cement, 4 percent of silicon micropowder, 44 percent of perlite aggregate, 6 percent of settled beads, 8 percent of floating beads, 2.3MPa of normal-temperature compressive strength, 0.01 percent of linear change rate after heat treatment at 110 ℃ and 0.55g/cm of volume density3The apparent porosity is 12.80 percent, and the room-temperature thermal conductivity is 0.50W/mK.
A preparation method of an aluminum-silicon castable added with floating beads comprises the following operation steps:
s1: preparation of materials: selecting a certain amount of calcium aluminate cement, wherein the calcium aluminate cement is cement taking calcium monoaluminate or calcium dialuminate as a main mineral component for later use; selecting a certain amount of sinking beads for later use, selecting a certain amount of silicon micropowder, and selecting a certain amount of perlite aggregate, wherein the perlite aggregate is acidic lava erupted from volcano, and is vitreous rock formed by rapid cooling, and is light aggregate;
s2: preparing floating beads: selecting a certain amount of floating beads, wherein the floating beads are fly ash hollow spheres capable of floating on the water surface, are offwhite, have thin and hollow walls and light weight and are reserved;
s3: mixing materials: mixing the above materials at a certain ratio, adding into a stirrer, adding water, and stirring for 5min to obtain slurry;
s4: molding: pouring the slurry into the triple die in sequence, placing the triple die on a vibration table for vibration, vibrating the slurry in the triple die while flattening, and vibrating for 8min for forming;
s5: demolding: naturally curing the casting material at room temperature for 24h after molding, demolding, and drying at 110 ℃ for 24 h;
s6: and (3) testing: taking out the material after heat treatment, cooling to room temperature, firstly measuring the volume density, linear change rate and apparent porosity, and then testing the compressive strength of the sample, wherein in order to reduce experimental errors, the average value of experimental results is taken as the final result.
Different amounts of floating beads are added in sequence in the step S3 for comparison experiment.
Example four:
on the basis of the third embodiment, the aluminum-silicon castable added with floating beads and the preparation method thereof comprise the following raw materials in parts by weight: 30-46 percent of calcium aluminate cement, 1-6 percent of silicon micropowder, 40-45 percent of perlite aggregate, 3-8 percent of sinking beads and 0-16 percent of floating beads.
34 percent of calcium aluminate cement, 4 percent of silicon micropowder, 42 percent of perlite aggregate, 4 percent of settled beads, 16 percent of floating beads, 1.6MPa of normal-temperature compressive strength, 0.01 percent of linear change rate after 110 ℃ heat treatment and 0.51g/cm of volume density3The apparent porosity was 13.10%, and the thermal conductivity at room temperature was 0.46W/mK.
A preparation method of an aluminum-silicon castable added with floating beads comprises the following operation steps:
s1: preparation of materials: selecting a certain amount of calcium aluminate cement, wherein the calcium aluminate cement is cement taking calcium monoaluminate or calcium dialuminate as a main mineral component for later use; selecting a certain amount of sinking beads for later use, selecting a certain amount of silicon micropowder, and selecting a certain amount of perlite aggregate, wherein the perlite aggregate is acidic lava erupted from volcano, and is vitreous rock formed by rapid cooling, and is light aggregate;
s2: preparing floating beads: selecting a certain amount of floating beads, wherein the floating beads are fly ash hollow spheres capable of floating on the water surface, are offwhite, have thin and hollow walls and light weight and are reserved;
s3: mixing materials: mixing the above materials at a certain ratio, adding into a stirrer, adding water, and stirring for 5min to obtain slurry;
s4: molding: pouring the slurry into the triple die in sequence, placing the triple die on a vibration table for vibration, vibrating the slurry in the triple die while flattening, and vibrating for 8min for forming;
s5: demolding: naturally curing the casting material at room temperature for 24h after molding, demolding, and drying at 110 ℃ for 24 h;
s6: and (3) testing: taking out the material after heat treatment, cooling to room temperature, firstly measuring the volume density, linear change rate and apparent porosity, and then testing the compressive strength of the sample, wherein in order to reduce experimental errors, the average value of experimental results is taken as the final result.
Different amounts of floating beads are added in sequence in the step S3 for comparison experiment.
The working principle is as follows: selecting a certain amount of calcium aluminate cement, wherein the calcium aluminate cement is cement taking calcium monoaluminate or calcium dialuminate as a main mineral component for later use; selecting a certain amount of sinking beads for later use, selecting a certain amount of silicon micropowder, and selecting a certain amount of perlite aggregate, wherein the perlite aggregate is acidic lava erupted from volcano, and is vitreous rock formed by rapid cooling, and is light aggregate; selecting a certain amount of floating beads, wherein the floating beads are fly ash hollow spheres capable of floating on water surface, are grey white, have thin and hollow walls and light weight, are prepared for later use, dry-mixing and uniformly mixing the raw materials according to a ratio, adding the mixture into a stirrer, adding water and stirring the mixture for 5min to prepare slurry, sequentially pouring the slurry into a triple die, placing the triple die on a vibrating table for vibrating, vibrating and flattening the slurry in the triple die at the same time, vibrating for 8min for forming, naturally curing and demolding the casting material at room temperature for 24h after forming, drying the casting material at 110 ℃ for 24h, taking out the material after heat treatment, cooling the material to room temperature, firstly measuring the bulk density, the linear change rate and the apparent porosity, then carrying out a compressive strength test on a sample, taking the average value of the experimental results as a final result, and having large specific surface area and high reaction activity in the casting material, the aluminum-silicon castable is beneficial to improving the combination of raw materials, improves the strength, has small volume density, is hollow, can form a relatively uniform gas connection structure with light porous perlite, reduces the thermal conductivity, improves the heat preservation effect, does not improve the normal-temperature compressive strength of the aluminum-silicon castable added with floating beads during low-temperature heat treatment, but obviously reduces the thermal conductivity of the castable, obviously reduces the volume density, increases the apparent porosity, keeps the linear change rate stable, and enhances the heat preservation performance.
It is noted that, herein, relational terms such as first and second (a, b, etc.) and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. An aluminum-silicon castable added with floating beads is characterized in that: comprises the following raw materials in parts by weight: the calcium aluminate cement accounts for 30-46%, the silicon micropowder accounts for 1-6%, the perlite aggregate accounts for 40-45%, the sinking bead accounts for 3-8%, and the floating bead accounts for 0-16%.
2. The floating bead added aluminum-silicon castable according to claim 1, wherein: the calcium aluminate cement accounts for 46 percent, the silicon micropowder accounts for 4 percent, the perlite aggregate accounts for 44 percent, the settled beads accounts for 6 percent, the floating beads accounts for 0 percent, the normal-temperature compressive strength is 4.1MPa, the linear change rate after the heat treatment at 110 ℃ is 0.02 percent, and the bulk density is 0.67g/cm3The apparent porosity is 11.80%, and the room-temperature thermal conductivity is 0.65W/mK.
3. The floating bead added aluminum-silicon castable according to claim 1, wherein: the calcium aluminate cement accounts for 42 percent, the silicon micropowder accounts for 4 percent, the perlite aggregate accounts for 44 percent, the settled beads accounts for 6 percent, the floating beads accounts for 4 percent, the normal-temperature compressive strength is 3.5MPa, the linear change rate after the heat treatment at 110 ℃ is 0.01 percent, and the bulk density is 0.64g/cm3The apparent porosity is 11.95%, and the room-temperature thermal conductivity is 0.55W/mK.
4. The floating bead added aluminum-silicon castable according to claim 1, wherein: the calcium aluminate cement accounts for 38 percent, the silicon micropowder accounts for 4 percent, the perlite aggregate accounts for 44 percent, the settled beads accounts for 6 percent, the floating beads accounts for 8 percent, the normal-temperature compressive strength is 2.3MPa, and the linear change rate after the heat treatment at 110 ℃ is higher than that of the cement0.01 percent and the volume density of 0.55g/cm3The apparent porosity is 12.80 percent, and the room-temperature thermal conductivity is 0.50W/mK.
5. The floating bead added aluminum-silicon castable according to claim 1, wherein: the calcium aluminate cement accounts for 34 percent, the silicon micropowder accounts for 4 percent, the perlite aggregate accounts for 42 percent, the settled beads accounts for 4 percent, the floating beads accounts for 16 percent, the normal-temperature compressive strength is 1.6MPa, the linear change rate after the heat treatment at 110 ℃ is-0.01 percent, and the bulk density is 0.51g/cm3The apparent porosity was 13.10%, and the thermal conductivity at room temperature was 0.46W/mK.
6. A preparation method of an aluminum-silicon castable added with floating beads is characterized by comprising the following steps: the method comprises the following operation steps:
s1: preparation of materials: selecting a certain amount of calcium aluminate cement, wherein the calcium aluminate cement is cement taking calcium monoaluminate or calcium dialuminate as a main mineral component for later use; selecting a certain amount of sinking beads for later use, selecting a certain amount of silicon micropowder, and selecting a certain amount of perlite aggregate, wherein the perlite aggregate is acidic lava erupted from volcano, and is vitreous rock formed by rapid cooling, and is light aggregate;
s2: preparing floating beads: selecting a certain amount of floating beads, wherein the floating beads are fly ash hollow spheres capable of floating on the water surface, are offwhite, have thin and hollow walls and light weight and are reserved;
s3: mixing materials: mixing the above materials at a certain ratio, adding into a stirrer, adding water, and stirring for 5min to obtain slurry;
s4: molding: pouring the slurry into the triple die in sequence, placing the triple die on a vibration table for vibration, vibrating the slurry in the triple die while flattening, and vibrating for 8min for forming;
s5: demolding: naturally curing the casting material at room temperature for 24h after molding, demolding, and drying at 110 ℃ for 24 h;
s6: and (3) testing: taking out the material after heat treatment, cooling to room temperature, firstly measuring the volume density, linear change rate and apparent porosity, and then testing the compressive strength of the sample, wherein in order to reduce experimental errors, the average value of experimental results is taken as the final result.
7. The method for preparing the floating bead added aluminum-silicon castable according to claim 6, wherein: different amounts of floating beads are added in sequence in the step S3 for comparison experiment.
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