CN114075084B - Preparation method of high-calcium-silicon-ratio aerated brick and high-calcium-silicon-ratio aerated brick prepared by same - Google Patents
Preparation method of high-calcium-silicon-ratio aerated brick and high-calcium-silicon-ratio aerated brick prepared by same Download PDFInfo
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
- C04B28/12—Hydraulic lime
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
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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
- C04B2111/40—Porous or lightweight materials
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a preparation method of an aerated brick with a high calcium-silicon ratio and the aerated brick with the high calcium-silicon ratio prepared by the preparation method, and relates to the technical field of building materials; a preparation method of an aerated brick with a high calcium-silicon ratio comprises the following steps: s1, pre-crystallization: weighing pre-crystallization raw materials, uniformly mixing, transferring into a high-pressure reaction kettle, and crystallizing to obtain a calcium silicate crystallization compound; s2, mixing materials: weighing aerated brick powder, adding the calcium silicate crystallization compound prepared in the step S1, and uniformly mixing to prepare a mixture; s3, pulping: adding water into the mixture, stirring, adding aluminum powder, and continuously stirring to obtain slurry; s4, foaming and standing: injecting the slurry into a mold, foaming, and standing to obtain a blank; s5, steam curing: cutting the blank into aerated blocks, and curing with steam to obtain the aerated brick. The preparation method of the high calcium-silicon ratio aerated brick has the advantage of improving the compressive strength of the product. The aerated brick with high calcium-silicon ratio has the advantage of high compressive strength.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation method of an aerated brick with a high calcium-silicon ratio and the aerated brick with the high calcium-silicon ratio.
Background
The aerated brick is also called an aerated concrete block and is an aerated concrete product prepared by high-temperature autoclaving treatment. The aerated brick is made of siliceous materials such as sand and calcareous materials such as lime as main raw materials by the processes of pulping, pouring, standing, cutting, autoclaving and the like. The aerated brick has the advantages of light weight, good thermal insulation performance, good sound insulation effect, strong earthquake resistance, strong adaptability, good processing performance and the like, and is gradually widely used.
The existing aerated brick preparation method generally comprises the steps of preparing raw materials such as sand, cement, lime, aluminum powder and the like into slurry, pouring the slurry into a mold, reacting the aluminum powder with alkali in the slurry to generate hydrogen so as to generate bubbles, expanding the slurry, standing to form a blank body with a hollow structure, and curing at high temperature and high pressure by using water vapor to obtain the aerated brick. In the standing treatment process, calcium hydroxide in the slurry reacts with silicon dioxide to generate calcium silicate gel, and in the high-temperature and high-pressure maintenance process of the blank, the calcium silicate gel generates crystallization reaction to generate a high-strength semi-crystalline calcium silicate material, so that the compression strength of the aerated brick is improved.
However, in the high-temperature and high-pressure curing process of the blank, if the autoclave curing temperature is too low, the calcium silicate gel is not easy to generate crystallization reaction to generate a high-strength semi-crystalline calcium silicate material, so that the compressive strength of the aerated brick is influenced; if the autoclaved curing temperature is too high, the high-strength semi-crystalline calcium silicate material is easy to crystallize to generate low-strength garnet, and certain adverse effects are brought to the compressive strength of the aerated brick.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a preparation method of an aerated brick with a high calcium-silicon ratio, which has the advantage of improving the compressive strength of a product.
The second purpose of the invention is to provide the aerated brick with high calcium-silicon ratio, which has the advantage of high compressive strength.
In order to achieve the first object, the invention provides the following technical scheme: a preparation method of an aerated brick with a high calcium-silicon ratio comprises the following steps:
s1, pre-crystallization: weighing pre-crystallization raw materials, mixing well, transferring into high pressure reaction kettle, sealing, heating to 160-180 deg.C, crystallizing for 4-7hr, cooling to room temperature, vacuum filtering, drying filter cake at 60-120 deg.C for 120-250min to obtain calcium silicate crystallization compound; the pre-crystallization raw material comprises the following raw materials in parts by weight: 2.5-3 parts of sodium silicate, 0.2-0.3 part of quicklime powder, 6-9 parts of water and 0.6-0.9 part of potassium hydroxide;
s2, mixing materials: weighing aerated brick powder, adding 0.2-0.8 part by weight of the calcium silicate crystallization compound prepared in the step S1, and uniformly mixing to prepare a mixture; the aerated brick powder comprises the following raw materials in parts by weight: 120-200 parts of sand, 20-50 parts of solid silica gel, 20-40 parts of white carbon black, 10-20 parts of gypsum, 120-150 parts of quicklime powder and 20-50 parts of cement;
s3, pulping: adding 80-120 parts by weight of water into the mixture, stirring at the rotating speed of 100-400 rpm for 5-10min, adding 0.2-0.5 part by weight of aluminum powder, and continuing stirring for 2-4min to prepare slurry;
s4, foaming and standing: injecting the slurry into a mold, foaming at room temperature for 30-50min, standing at 50-60 deg.C for 200-280min to obtain embryo body;
s5, steam curing: cutting the blank into aerated blocks, transferring the aerated blocks into a still kettle, and curing in steam at 170-190 ℃ for 300-360min to obtain the aerated brick.
By adopting the technical scheme, in the production process of the aerated brick, calcium ions are contained in quicklime powder and cement, silicon dioxide is contained in substances such as sand, solid silica gel and white carbon black, calcium in the slurry reacts with the silicon dioxide to generate calcium silicate hydrate gel, the blank is cured by high-temperature and high-pressure water vapor, and the calcium silicate hydrate gel in the blank is crystallized to generate a high-strength semi-crystalline calcium silicate material in the environment of high-temperature and high-pressure water vapor, so that the compressive strength of the aerated brick is improved; however, in a high-temperature and high-pressure state, a semi-crystalline calcium silicate material is easy to be crystallized to generate low-strength garnet, and the strength of the aerated brick is adversely affected. According to the method, under the strong alkaline condition of potassium hydroxide, sodium silicate and quicklime powder are subjected to high-temperature pre-crystallization reaction to generate a calcium silicate crystallization compound containing a semi-crystalline calcium silicate material, the calcium silicate crystallization compound is added into slurry to serve as a seed crystal, the calcium silicate crystallization compound forms a crystal nucleus in the high-temperature steam curing process, hydrated calcium silicate gel is induced to crystallize to generate the high-strength semi-crystalline calcium silicate material, the curing temperature in the steam curing process is reduced, the semi-crystalline calcium silicate material is prevented from being crystallized to generate garnet which is unfavorable for the strength of the aerated brick, and the compressive strength of the aerated brick is remarkably improved. Compared with the prior art, lime powder consumption is more in this application, and the calcium-silicon ratio of air-added brick is high, and idiosome basicity is higher, helps promoting calcium silicate hydrate gel crystallization to generate high-strength semi-crystalline calcium silicate material, improves air-added brick product compressive strength. According to the method, the composite siliceous material of the solid silica gel, the white carbon black and the sand is added into the slurry, the reaction rate of the white carbon black and calcium ions to generate hydrated calcium silicate gel is high, the reaction rate of the solid silica gel is low, and the reaction rate of the sand is low. The compressive strength of the aerated brick product is obviously improved by adding a self-made calcium silicate crystallization compound, improving the calcium-silicon ratio of the fed material, reducing the steam curing temperature and using a composite siliceous material, wherein the factors are influenced together.
Preferably, the raw materials used in the steps S2-S3 are fed according to the following weight parts: 0.4-0.6 part of calcium silicate crystallization compound, 150-180 parts of sand, 30-40 parts of solid silica gel, 25-35 parts of white carbon black, 10-20 parts of gypsum, 120-150 parts of quicklime powder, 30-40 parts of cement, 95-105 parts of water and 0.2-0.5 part of aluminum powder.
By adopting the technical scheme, the better raw material proportion is used, the compressive strength of the aerated brick is favorably improved, the service life of a product is favorably prolonged, and the product market popularization is favorably realized.
Preferably, the sodium silicate is sodium metasilicate nonahydrate, and the pre-crystallization raw material further comprises 0.05 to 0.1 weight part of ethanol.
By adopting the technical scheme, a small amount of ethanol is added in the pre-crystallization process, the ethanol is mutually soluble with water, the function similar to the salting-out effect is achieved, the solid-phase calcium silicate hydrate gel generated by sodium metasilicate nonahydrate and calcium ions is promoted, the calcium silicate hydrate gel is induced to generate the small-grain semi-crystalline calcium silicate material through a solid-phase conversion mechanism, the small-grain semi-crystalline calcium silicate material has a larger specific surface area, more effective crystal nuclei are formed in the steam curing process of the step S5, the calcium silicate hydrate gel is promoted to be more converted into the high-strength semi-crystalline calcium silicate material in the steam curing process of the step S5, and the compression strength of the aerated brick product is improved.
Preferably, the pre-crystallization raw materials are weighed in the step S1, mixed evenly, transferred into a high-pressure reaction kettle, sealed, stirred at the rotating speed of 200-500 r/min, heated to 170-190 ℃ for crystallization for 4-7hr, cooled to room temperature, filtered, and dried at 60-120 ℃ for 120-250min to obtain dry materials, and the dry materials are crushed until the particle size is not more than 20 mu m to obtain the calcium silicate crystallization compound.
By adopting the technical scheme, the calcium silicate crystallization compound is crystallized under the stirring state, the particle size of the calcium silicate crystallization compound is reduced, more effective crystal nuclei are formed in the steam curing process in the step S5, the calcium silicate hydrate gel is promoted to be converted into a high-strength semi-crystalline calcium silicate material more in the steam curing process in the step S5, and the compression strength of the aerated brick product is improved.
Preferably, the aerated brick powder further comprises 0.2-0.5 part by weight of decaglycol phosphate.
By adopting the technical scheme, the aluminum powder reacts with alkali in the slurry in the foaming process to generate hydrogen, bubbles are generated to expand the slurry to form a hollow structure, the sound insulation performance and the heat insulation performance of the aerated brick are improved, a small amount of the decaglycol phosphate with a certain dispersion effect is added into the slurry, the aluminum powder is uniformly dispersed in the slurry, and the sound insulation performance and the heat insulation performance of the aerated brick are better improved.
Preferably, the aerated brick powder further comprises 0.1-0.4 part by weight of acetate starch.
By adopting the technical scheme, a small amount of acetate starch with strong adhesive property is added into the slurry, which is beneficial to improving the bonding strength among the components in the aerated brick and improving the compressive strength of the aerated brick.
Preferably, the sand has a particle size of not more than 200 μm, and the solid silica gel has a particle size of not more than 50 μm.
By adopting the technical scheme, the sand and the solid silica gel with proper particle sizes are used, so that the bonding strength among the components in the aerated brick is improved, and the compressive strength of the aerated brick is improved.
Preferably, in the step S5, the blank is cut into aerated blocks, the aerated blocks are transferred into an autoclave, the autoclave is vacuumized to-0.09 to-0.07 MPa, water vapor is introduced, the introduction amount of the water vapor is controlled to enable the autoclave to be heated to 170 to 190 ℃ at the heating rate of 40 to 60 ℃/h, and the aerated bricks are prepared through heat preservation and maintenance for 300 to 360 min.
By adopting the technical scheme, the autoclave is firstly vacuumized before being heated, and the proper heating rate is used, so that the generation of mixed crystals is reduced, and the compressive strength of the aerated brick product is improved.
In order to achieve the second object, the invention provides the following technical scheme: the high-calcium-silicon-ratio aerated brick is prepared by the preparation method of the high-calcium-silicon-ratio aerated brick.
By adopting the technical scheme, the aerated brick prepared by the method disclosed by the application is beneficial to improving the compressive strength of an aerated brick product, prolonging the service life of the aerated brick product and promoting the product market popularization.
In summary, the invention includes at least one of the following beneficial technical effects:
1. according to the method, a calcium silicate crystallization compound serving as a seed crystal is prepared through pre-crystallization, a composite siliceous material consisting of sand, solid silica gel and white carbon black is selected, the generation rate of calcium silicate hydrate gel is favorably controlled, the generation of miscellaneous crystals is favorably avoided, the proportion of high calcium-silicon ratio is used, the reaction rate of crystallization of the calcium silicate hydrate gel to generate semi-crystalline calcium silicate is favorably accelerated, the calcium silicate crystallization compound serving as the seed crystal is added into slurry, crystal nuclei are formed in the high-temperature and high-pressure water vapor maintenance process in the step S5, the calcium silicate hydrate gel is induced to crystallize to generate a high-strength semi-crystalline calcium silicate material, meanwhile, the water vapor maintenance temperature in the step S5 is reduced, the semi-crystalline calcium silicate is favorably prevented from being transformed into miscellaneous crystals such as low-strength garnet, and the compressive strength of the air-entrapping brick is obviously improved;
2. according to the method, ethanol is added in the pre-crystallization step, the pre-crystallization is carried out under the stirring state, and the dry materials are crushed, so that the particle size of the calcium silicate crystallization compound is reduced, more effective crystal nuclei are formed in the steam curing process of the step S5, the calcium silicate hydrate gel is promoted to be converted into a high-strength semi-crystalline calcium silicate material in the steam curing process of the step S5, and the compression strength of the aerated brick product is improved;
3. the aluminum powder is uniformly dispersed in the slurry by adding the decaglycol phosphate, so that the sound insulation performance and the heat insulation performance of the aerated brick are better improved;
4. this application is through adding acetate starch, control grit and solid silica gel's particle diameter, to evaporating the cauldron mode such as vacuum pumping treatment and use suitable rate of rise, helps improving the compressive strength of air entrainment brick product, helps prolonging product life, helps product market popularization.
Detailed Description
Examples
The raw materials of the present invention are all commercially available, and the types and sources of some of the raw materials are shown in table 1.
TABLE 1 Specification, type and origin of the raw materials
In the following examples, sand was produced from Sichuan and was machine-made sand having a particle size of not more than 200 μm.
Example 1: a preparation method of an aerated brick with a high calcium-silicon ratio comprises the following steps:
s1, pre-crystallization: weighing 7.5Kg of water, adding 2.8Kg of sodium silicate, 0.25Kg of quicklime powder, 0.8Kg of potassium hydroxide and 0.05-0.1Kg of ethanol, uniformly mixing, transferring into a 15L high-pressure reaction kettle, sealing, stirring at the rotating speed of 300 r/min, heating to 170 ℃ for crystallization for 5 hours, cooling to room temperature, discharging, performing suction filtration, washing a filter cake with 10Kg of water, transferring the filter cake into a drying box, drying at 80 ℃ for 180min to obtain a dry material, crushing the dry material by a crusher, sieving by a sieve with the aperture of 20 mu m, and continuously crushing particles with the particle size of more than 20 mu m until the particle size is not more than 20 mu m to obtain the calcium silicate crystallization compound.
S2, mixing materials: sieving sand by using a screen with the aperture of 200 mu m, and selecting the sand with the particle size of not more than 200 mu m; sieving the solid silica gel with a sieve with a pore diameter of 50 μm, and selecting the solid silica gel with a particle size of not more than 50 μm. 160kg of sand is weighed, 35kg of solid silica gel, 30kg of white carbon black, 15kg of gypsum, 140kg of quicklime powder, 35kg of cement, 0.3kg of dodecyl phosphate and 0.2kg of acetate starch are added, 0.5kg of the calcium silicate crystallization compound prepared in the step S1 is added, and the mixture is prepared by uniformly mixing.
S3, pulping: and adding 100kg of water into the mixture, stirring at the rotating speed of 300 revolutions per minute for 8min, adding 0.3kg of aluminum powder, and continuously stirring for 3min to obtain slurry.
S4, foaming and standing: and injecting the slurry into an aerated brick mold, and foaming for 40min at room temperature. The static stopping treatment is carried out in a static stopping greenhouse, a heating pipeline is arranged in the static stopping greenhouse, the temperature of the static stopping greenhouse is adjusted to 55 ℃, the aerated brick mould is transferred into the static stopping greenhouse, and the static stopping is carried out for 240min at the temperature of 55 ℃, so that the embryo body is prepared.
S5, steam curing: cutting the blank into aerated blocks, transferring the aerated blocks into an autoclave, vacuumizing to-0.08 MPa, introducing steam, controlling the introduction amount of the steam to heat the autoclave to 180 ℃ at the heating rate of 50 ℃/h, keeping the pressure at 1.2MPa, and maintaining at 180 ℃ for 320min to obtain the aerated brick.
Example 2
Example 2 differs from example 1 in that no ethanol was added in step S1 of example 2, and otherwise the procedure was identical to example 1.
Example 3
Example 3 differs from example 1 in that example 3 does not add decaethylene phosphate, all otherwise remaining the same as example 1.
Example 4
Example 4 differs from example 1 in that example 4 does not add acetate starch and otherwise remains the same as example 1.
Example 5
Example 5 differs from example 1 in that in step S5 of example 5, the autoclave was heated to 180 ℃ at a heating rate of 80 ℃/h with the amount of steam introduced being controlled, and otherwise the same as in example 1.
Examples 6 to 13
Examples 6-13 differ from example 1 in the amounts of raw materials added and the process parameters of examples 6-13. The particle sizes of the calcium silicate crystal compound, sand and solid silica gel in examples 6 to 13 were all the same as those in example 1, the amounts of the raw materials added in examples 6 to 13 are shown in Table 2, and the process parameters in examples 6 to 13 are shown in Table 3.
TABLE 2 addition amounts of the respective raw materials of examples 6 to 13
TABLE 3 parameters in the procedure of examples 6-13
Comparative example
Comparative example 1
Comparative example 1 is different from example 1 in that comparative example 1 does not add the calcium silicate crystallization compound, comparative example 1 does not undergo the pre-crystallization step, and the amount of lime powder used in comparative example 1 is reduced from 140kg to 80kg, all other things remaining the same as example 1.
Comparative example 2
Comparative example 2 differs from example 1 in that comparative example 2 does not add the calcium silicate crystallizing compound, comparative example 2 does not undergo the pre-crystallization step, and comparative example 2 step S5 increases the steam curing temperature from 180 ℃ to 220 ℃, all otherwise consistent with example 1.
Comparative example 3
Comparative example 3 differs from example 1 in that the amount of lime powder used in comparative example 3 was reduced from 140kg to 80kg, all the other things remaining the same as in example 1.
Comparative example 4
Comparative example 4 differs from example 1 in that comparative example 4 does not include solid silica gel and silica white, and comparative example 4 increases the sand usage from 160kg to 225kg, all other things remaining the same as example 1.
Performance detection
1. Compressive strength: according to the method disclosed in GB/T11969-2008 < method for testing properties of autoclaved aerated concrete >, test pieces with the size of 100mm x 100mm are manufactured, the compression strength is tested, and the results are shown in Table 4.
TABLE 4 comparison table of properties of different aerated bricks
| Sample numbering | Compressive strength (MPa) |
| Example 1 | 13.6 |
| Example 2 | 10.5 |
| Example 3 | 11.8 |
| Example 4 | 11.4 |
| Example 5 | 11.2 |
| Example 6 | 12.8 |
| Example 7 | 12.6 |
| Example 8 | 12.3 |
| Example 9 | 12.5 |
| Example 10 | 13.3 |
| Example 11 | 13.7 |
| Example 12 | 13.5 |
| Example 13 | 13.1 |
| Comparative example 1 | 3.2 |
| Comparative example 2 | 4.3 |
| Comparative example 3 | 5.8 |
| Comparative example 4 | 5.4 |
In the comparative example 1, a self-made calcium silicate crystallization compound serving as a crystal seed is not added, and the low calcium-silicon ratio is used, so that the prepared aerated brick product has low compressive strength and poor mechanical strength performance, and is not beneficial to market popularization. Comparative example 2 no self-made calcium silicate crystallization compound as seed crystal is added, and steam curing is carried out at a higher temperature, so that the compressive strength of the prepared aerated brick product is not high, and the product market popularization is not facilitated. Comparative example 3 the lime powder is less in dosage, the proportion of low calcium to silicon is used, and the prepared aerated brick product is not high in compressive strength and not beneficial to product market popularization. In the comparative example 4, the composite silica material consisting of solid silica gel, white carbon black and sand is not used, and the single sand silica material is used, so that the compressive strength of the prepared aerated brick product is not high, and the market popularization of the product is not facilitated.
Comparing the experimental results of the example 1 and the comparative examples 1 to 4, it can be seen that in the preparation process of the air-added brick, the self-made calcium silicate crystallization compound is added as the crystal seed, the high calcium silicon ratio is used, the steam curing is carried out at a lower temperature, and the composite silicon material consisting of the solid silica gel, the white carbon black and the sand is used, so that the compressive strength of the air-added brick product is obviously improved, the service life of the product is prolonged, and the market popularization of the product is facilitated.
Compared with the experimental results of the embodiment 1 and the embodiment 2, the embodiment 2 has the advantage that the compression strength of the prepared aerated brick product is reduced without adding ethanol in the step S1, and the market popularization of the product is not facilitated. Comparing the experimental results of example 1 and example 3, the compressive strength of the air-entrained brick product prepared in example 3 is slightly reduced without adding the dodecaglycol phosphate. Comparing the experimental results of example 1 and example 4, the example 4 does not add acetate starch, and the compressive strength of the prepared aerated brick product is slightly reduced, which is not beneficial to the market popularization of the product. Comparing the experimental results of example 1 and example 5, in the step S5 of example 5, a faster heating rate is used, and the compressive strength of the prepared aerated brick product is slightly reduced, which is not beneficial to the market popularization of the product.
Compared with the embodiment 1, the addition amounts of the raw materials in the embodiments 6 to 13 are different, and the process parameters are different, in the preparation process of the aerated brick, the self-made calcium silicate crystallization compound is added as the crystal seed, the high calcium silicon ratio proportion is used, and the composite siliceous material consisting of the solid silica gel, the white carbon black and the sand is used, so that the compressive strength of the prepared aerated brick product is obviously improved, the product has excellent mechanical strength, the service life of the product is prolonged, and the market popularization of the product is facilitated.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. The preparation method of the high-calcium-silicon-ratio aerated brick is characterized by comprising the following steps of:
s1, pre-crystallization: weighing pre-crystallization raw materials, mixing well, transferring into high pressure reaction kettle, sealing, heating to 160-180 deg.C, crystallizing for 4-7hr, cooling to room temperature, vacuum filtering, drying filter cake at 60-120 deg.C for 120-250min to obtain calcium silicate crystallization compound; the pre-crystallization raw material comprises the following raw materials in parts by weight: 2.5-3 parts of sodium silicate, 0.2-0.3 part of quicklime powder, 6-9 parts of water and 0.6-0.9 part of potassium hydroxide;
s2, mixing materials: weighing aerated brick powder, adding 0.2-0.8 part by weight of the calcium silicate crystallization compound prepared in the step S1, and uniformly mixing to obtain a mixture; the aerated brick powder comprises the following raw materials in parts by weight: 120-200 parts of sand, 20-50 parts of solid silica gel, 20-40 parts of white carbon black, 10-20 parts of gypsum, 120-150 parts of quicklime powder and 20-50 parts of cement;
s3, pulping: adding 80-120 parts by weight of water into the mixture, stirring at the rotating speed of 100-400 rpm for 5-10min, adding 0.2-0.5 part by weight of aluminum powder, and continuing stirring for 2-4min to prepare slurry;
s4, foaming and standing: injecting the slurry into a mold, foaming at room temperature for 30-50min, standing at 50-60 deg.C for 200-280min to obtain embryo body;
s5, steam curing: cutting the blank into aerated blocks, transferring the aerated blocks into a still kettle, and curing in steam at 170-190 ℃ for 300-360min to obtain aerated bricks;
the sodium silicate is sodium metasilicate nonahydrate, and the pre-crystallization raw material also comprises 0.05 to 0.1 weight part of ethanol;
the aerated brick powder also comprises 0.2 to 0.5 weight part of decaglycol phosphate.
2. The preparation method of the high calcium-silicon ratio aerated brick according to claim 1, wherein the raw materials used in the steps S2-S3 are added according to the following weight parts: 0.4-0.6 part of calcium silicate crystallization compound, 150-180 parts of sand, 30-40 parts of solid silica gel, 25-35 parts of white carbon black, 10-20 parts of gypsum, 120-150 parts of quicklime powder, 30-40 parts of cement, 95-105 parts of water and 0.2-0.5 part of aluminum powder.
3. The preparation method of the high calcium-silicon ratio aerated brick according to claim 1, characterized by comprising the following steps: weighing the pre-crystallization raw materials in the step S1, uniformly mixing, transferring into a high-pressure reaction kettle, sealing, stirring at the rotating speed of 200-500 r/min, heating to 170-190 ℃ for crystallization for 4-7hr, cooling to room temperature, carrying out suction filtration, drying the filter cake at 60-120 ℃ for 120-250min to obtain a dry material, and crushing the dry material until the particle size is not more than 20 mu m to obtain the calcium silicate crystallization compound.
4. The preparation method of the high calcium-silicon ratio aerated brick according to claim 3, which is characterized by comprising the following steps: the aerated brick powder also comprises 0.1-0.4 parts by weight of acetate starch.
5. The preparation method of the high calcium-silicon ratio aerated brick according to claim 1, which is characterized by comprising the following steps: the particle size of the sand is not more than 200 mu m, and the particle size of the solid silica gel is not more than 50 mu m.
6. The preparation method of the high calcium-silicon ratio aerated brick according to claim 1, characterized by comprising the following steps: and S5, cutting the blank into aerated blocks, transferring the aerated blocks into a still kettle, vacuumizing to-0.09 MPa to-0.07 MPa, introducing steam, controlling the introduction amount of the steam to enable the still kettle to be heated to 170-190 ℃ at the heating rate of 40-60 ℃/h, and maintaining for 300-360min to obtain the aerated brick.
7. The high-calcium-silicon ratio aerated brick is characterized in that: the high-calcium-silicon-ratio aerated brick is prepared by the preparation method of any one of claims 1 to 6.
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