CN114075085A - Method for preparing aerated brick by using phosphogypsum and aerated brick prepared by method - Google Patents
Method for preparing aerated brick by using phosphogypsum and aerated brick prepared by method Download PDFInfo
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- CN114075085A CN114075085A CN202010844246.2A CN202010844246A CN114075085A CN 114075085 A CN114075085 A CN 114075085A CN 202010844246 A CN202010844246 A CN 202010844246A CN 114075085 A CN114075085 A CN 114075085A
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- 239000011449 brick Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 46
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 239000004567 concrete Substances 0.000 claims abstract description 32
- 239000002002 slurry Substances 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 14
- 238000000498 ball milling Methods 0.000 claims abstract description 13
- 239000011456 concrete brick Substances 0.000 claims abstract description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 11
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 11
- 239000004571 lime Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005303 weighing Methods 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 4
- 239000010881 fly ash Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 17
- 239000001245 distarch phosphate Substances 0.000 claims description 11
- 235000013804 distarch phosphate Nutrition 0.000 claims description 11
- 239000000314 lubricant Substances 0.000 claims description 11
- 230000009974 thixotropic effect Effects 0.000 claims description 11
- 229910021536 Zeolite Inorganic materials 0.000 claims description 9
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 9
- 239000010457 zeolite Substances 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 7
- QEOWFDYSNYCPRK-UHFFFAOYSA-N OCC[Na] Chemical compound OCC[Na] QEOWFDYSNYCPRK-UHFFFAOYSA-N 0.000 claims description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 239000004566 building material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 230000006835 compression Effects 0.000 description 15
- 238000007906 compression Methods 0.000 description 15
- 230000003068 static effect Effects 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 10
- 230000002035 prolonged effect Effects 0.000 description 9
- 239000003513 alkali Substances 0.000 description 5
- 239000001506 calcium phosphate Substances 0.000 description 5
- 229910000389 calcium phosphate Inorganic materials 0.000 description 5
- 235000011010 calcium phosphates Nutrition 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 238000004904 shortening Methods 0.000 description 5
- 229940045998 sodium isethionate Drugs 0.000 description 5
- LADXKQRVAFSPTR-UHFFFAOYSA-M sodium;2-hydroxyethanesulfonate Chemical compound [Na+].OCCS([O-])(=O)=O LADXKQRVAFSPTR-UHFFFAOYSA-M 0.000 description 5
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 230000032683 aging Effects 0.000 description 4
- 239000003518 caustics Substances 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 238000003776 cleavage reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000007017 scission Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
- C04B28/342—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition as a mixture of free acid and one or more reactive oxides
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a method for preparing an aerated brick by using phosphogypsum and the aerated brick prepared by the method, and relates to the technical field of building materials; a method for preparing aerated bricks by using phosphogypsum comprises the following steps: s1 pretreatment: weighing external feeding raw materials, and performing ball milling to prepare external feeding; the external material comprises the following raw materials in parts by weight: 10-20 parts of phosphogypsum slag and 180 parts of lime powder; weighing water, adding fly ash and sand, and performing ball milling to obtain slurry; s2 mixing: adding the additional material into the slurry to prepare concrete slurry; s3, casting and standing: injecting the concrete slurry into a mould, and standing to prepare a concrete blank; s4 steam curing: and cutting the concrete blank into concrete bricks, and transferring the concrete bricks into an autoclave for curing to obtain the aerated bricks. The method for preparing the aerated brick by using the phosphogypsum has the advantage of high production efficiency. The aerated brick prepared by the method for preparing the aerated brick by using the phosphogypsum has the advantage of low process cost.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a method for preparing an aerated brick by using phosphogypsum and the aerated brick prepared by the method.
Background
Autoclaved aerated concrete blocks, also known as aerated bricks, are aerated concrete blocks produced by a high-temperature autoclaved process. The aerated brick has excellent heat preservation and insulation performance, sound insulation performance, earthquake resistance and high temperature resistance, and is gradually used in the fields of buildings in severe cold regions, buildings in earthquake resistant regions and the like. Meanwhile, people have more and more researches on aerated bricks.
CN108218326A discloses a tailing slag aerated brick and a production process thereof, wherein the tailing slag aerated brick is prepared from the following raw materials in parts by weight: 600-750 parts of tailing slag, 60-75 parts of carbide mud, 60-75 parts of cement, 20-30 parts of caustic alkali and 150-200 parts of river sand; the production process of the aerated brick comprises the following steps: s1, raw material treatment and batching: screening and dehydrating the tailing slag, dehydrating river sand, and performing ball milling to obtain river sand powder; taking the carbide mud, the cement and the caustic alkali, primarily stirring the carbide mud, the cement and the caustic alkali by using a stirrer, mixing a mixture of the carbide mud, the cement and the caustic alkali which are primarily stirred with the river sand and the tailing slag, secondarily stirring the mixture, and adding a proper amount of water; s2, aging: putting the mixed material in the S1 into an aging bin, standing and aging; s3, rolling treatment: uniformly putting the material aged in the step S2 into a brick pressing mold, rolling the material by using a brick press until bleeding occurs in the mold, and continuing rolling for 5-8 minutes; s4: and (3) standing treatment: standing the material rolled in the step S3 for 5-8 hours at normal temperature, demolding, conveying to a cutting part, and cutting to obtain a brick blank; s5, autoclaving treatment: and (4) transferring the brick blank prepared in the step (S4) to a reaction kettle, performing autoclaved curing treatment, and cooling and warehousing after the autoclaved curing is finished to prepare the aerated brick. According to the technical scheme, the aerated brick with good durability is prepared through raw material treatment, material preparation, aging treatment, rolling treatment, standing treatment and autoclaved curing treatment.
However, in order to improve the mechanical property of the aerated brick, the static stop treatment of the technical scheme reaches 5-8 hours, the static stop treatment time is long, the production efficiency is reduced to a certain extent, and the process cost is improved.
Disclosure of Invention
Aiming at the defects in the prior art, the first purpose of the invention is to provide a method for preparing aerated bricks by using phosphogypsum, which has the advantages of high production efficiency and capability of improving the pressure resistance of products.
The second purpose of the invention is to provide an aerated brick which has the advantages of low process cost and good compression resistance.
In order to achieve the first object, the invention provides the following technical scheme: a method for preparing aerated bricks by using phosphogypsum comprises the following steps:
s1 pretreatment: weighing external feeding raw materials, uniformly mixing, and performing ball milling to prepare external feeding; the external material comprises the following raw materials in parts by weight: 10-20 parts of phosphogypsum slag, 180 parts of lime powder and 0.5-1.5 parts of hydroxyethyl sodium sulfonate; weighing 140 parts by weight of 100-140 parts by weight of water, adding 150-250 parts by weight of fly ash and 200 parts by weight of sand, uniformly mixing, and performing ball milling to obtain slurry;
s2 mixing: adding the additional material into the slurry, adding the functional raw materials, and uniformly mixing to obtain concrete slurry; the functional raw materials comprise the following raw materials in parts by weight: 25-50 parts of cement and 0.3-0.8 part of aluminum powder;
s3, casting and standing: injecting the concrete slurry into a mould, standing at 50-60 ℃ for 150-;
s4 steam curing: cutting the concrete blank into concrete bricks, transferring the concrete bricks into an autoclave, and curing in water vapor at the temperature of 180-220 ℃ for 400min to obtain the aerated bricks.
By adopting the technical scheme, the phosphogypsum slag is solid waste which is not friendly to the environment and is generated in the wet-process phosphoric acid process; the phosphogypsum slag is utilized to prepare the aerated brick, so that the environmental pollution is reduced, the waste recycling is realized, and the raw material cost is reduced; on the other hand, the phosphogypsum slag is added into the raw materials of the aerated brick, the phosphogypsum slag and the lime powder are subjected to ball milling treatment together, phosphoric acid in the phosphogypsum slag reacts with the lime powder to generate calcium phosphate with an anti-caking function and an acid-base buffering function, so that the stability of phosphorus is kept, the stability of concrete slurry is kept, the compression resistance of the aerated brick is improved, a concrete blank is quickly condensed, and the standing time is shortened on the premise of keeping high compression strength; in the process of pouring and standing still, aluminum powder reacts with alkaline substances in the concrete slurry to generate hydrogen, the pH value of the concrete slurry changes while hollowing is generated, and calcium phosphate generated by phosphogypsum slag and lime has the function of regulating the pH value, thereby being beneficial to controlling the gas generation rate and controlling the product quality; standing and maintaining at 50-60 deg.C, which is helpful for accelerating water volatilization, accelerating concrete slurry hardening, and shortening standing and maintaining time; the addition of the hydroxyethyl sodium sulfonate is beneficial to improving the compatibility of all components in the aerated brick, improving the compression resistance of the aerated brick, shortening the standing time, shortening the production period, reducing the process cost and improving the production efficiency to a certain extent on the premise of ensuring the compression resistance of the aerated brick.
Preferably, the raw materials used in the steps S1-S2 are fed according to the following weight ratio: 13-17 parts of phosphogypsum slag, 160 parts of lime powder 140-.
By adopting the technical scheme, the better raw material proportion is used, the mechanical property of the aerated brick is improved, the compressive strength is improved, and the service life of the product is prolonged.
Preferably, the particle size of the external charge is not more than 160 μm; the sand has a particle size of not more than 300 μm, and the slurry has a particle size of not more than 250 μm.
By adopting the technical scheme, the aerated brick raw material with a proper particle size is used, so that the mechanical property of the aerated brick is improved, the compressive strength is improved, and the service life of the product is prolonged.
Preferably, the step S4 is to cut the concrete blank into concrete bricks, transfer the concrete bricks into an autoclave, vacuumize to-0.085 MPa to-0.07 MPa, and cure in water vapor at 220 ℃ of 180 ℃ for 280 min and 400min to obtain the aerated bricks.
By adopting the technical scheme, the autoclave is pumped into a vacuum state and then is cured by introducing steam, so that the partial pressure of the steam in a system is improved, the aerated brick is better cured, the compressive strength of the aerated brick is improved, and the service life of a product is prolonged.
Preferably, the external feeding raw material also comprises 1-3 parts by weight of acetylated distarch phosphate.
By adopting the technical scheme, the acetylated distarch phosphate is added into the aerated brick, so that the adjustment of the viscosity of concrete slurry is facilitated, the mechanical strength of the aerated brick is improved, the compression resistance of a product is improved, and the service life of the product is prolonged.
Preferably, the external feeding raw material also comprises 0.5-2.5 parts by weight of thixotropic lubricant.
By adopting the technical scheme, the thixotropic lubricant is added into the concrete, the viscosity is reduced when the concrete slurry is prepared, the stirring and pouring operation is convenient, the viscosity is higher when the concrete slurry is statically stopped and maintained, the stability of the product is improved, the mechanical strength of the product is improved, and the service life of the product is prolonged.
Preferably, the functional raw material also comprises 10-18 parts by weight of zeolite powder.
By adopting the technical scheme, a small amount of zeolite powder is added into the aerated brick, and the zeolite powder has a certain adsorption and storage effect on metal ions, chloride ions and the like in a system, so that the concentration of the free metal ions, chloride ions and the like is reduced, the corrosion resistance of the product is improved, and the service life of the product is prolonged.
In order to achieve the second object, the invention provides the following technical scheme: an aerated brick is prepared by the method for preparing the aerated brick by using the phosphogypsum.
By adopting the technical scheme, the method for preparing the aerated brick by using the phosphogypsum disclosed by the application shortens the standing time on the premise of keeping the excellent pressure resistance, is favorable for improving the production efficiency, reducing the process cost, improving the pressure resistance of the product and prolonging the service life of the product.
In summary, the invention includes at least one of the following beneficial technical effects:
1. aluminum powder and lime powder are added into concrete slurry, the aluminum powder reacts with alkali to generate hydrogen, and the aerated brick with the hollow characteristic is prepared through standing and steam curing; the phosphogypsum slag is added, so that on one hand, the environmental pollution can be reduced, the recycling of pollutants is realized, and the raw material cost is favorably reduced; on the other hand, the phosphogypsum slag and the lime powder are subjected to ball milling treatment and react to generate calcium phosphate with an acid-base adjusting function, the pH value of the system can be changed in the reaction process of the aluminum powder and the base, and the calcium phosphate is beneficial to adjusting the pH value of the system, adjusting the gas generation rate and controlling the product quality; the calcium phosphate also has an anti-caking function, is beneficial to keeping the stability of concrete slurry and improving the compression resistance of a product, is static at 50-60 ℃, is beneficial to accelerating the volatilization of water, quickly coagulates and hardens materials, shortens the static stop time on the premise of keeping excellent compression resistance, improves the production efficiency and reduces the process cost; the addition of the sodium isethionate is beneficial to improving the compatibility of the components in the aerated brick, improving the compression resistance of the aerated brick, shortening the standing time, shortening the production period, reducing the process cost and improving the production efficiency to a certain extent on the premise of ensuring the compression resistance of the aerated brick;
2. according to the method, the compression resistance of the product is improved and the service life of the product is prolonged by controlling the particle size of the external feeding material, controlling the particle size of sand, vacuumizing before steam curing, adding acetylated distarch phosphate, adding a thixotropic lubricant and the like;
3. by adding the zeolite powder, the zeolite powder has an adsorption and storage function on free metal ions, chloride ions and the like, the concentration of the free metal ions and the concentration of the chloride ions are reduced, the corrosion resistance of the product is improved, and the service life of the product is prolonged.
Detailed Description
Examples
The raw materials related to the invention are all commercially available, and the types and sources of part 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 the sand was machine-made sand having a particle size of not more than 300. mu.m.
Example 1: a method for preparing aerated bricks by using phosphogypsum comprises the following steps:
s1 pretreatment: weighing 150kg of lime powder, adding 15kg of phosphogypsum slag, 1kg of sodium isethionate, 2kg of acetylated distarch phosphate and 1.5kg of thixotropic lubricant, uniformly mixing, transferring into a ball mill, carrying out ball milling for 10min at a rotating speed of 20 revolutions per minute to prepare external charging material, and detecting the particle size of the external charging material by using a laser particle size analyzer, wherein the particle size of the external charging material is not more than 160 microns; weighing 120kg of water, adding 200kg of fly ash and 150kg of sand, uniformly mixing, transferring into a ball mill, carrying out ball milling for 20min at a rotating speed of 20 r/min to obtain slurry, and detecting the particle size of the slurry by using a laser particle size analyzer, wherein the particle size of the slurry is not more than 250 mu m.
S2 mixing: adding the external material into the slurry, adding 38kg of cement, 0.5kg of aluminum powder and 14kg of zeolite powder, and uniformly mixing to obtain the concrete slurry.
S3, casting and standing: the static stop treatment is carried out in a static stop greenhouse, and a heating pipeline is installed in the static stop greenhouse. And (3) injecting the concrete slurry into a special mould for the aerated brick, and foaming for 30min at room temperature. And (3) adjusting the temperature of the static stop greenhouse to 55 ℃, transferring the special mould for the aerated brick into the static stop greenhouse, standing at 55 ℃ for 180min, and demoulding to obtain the concrete blank.
S4 steam curing: cutting the concrete blank into a plurality of concrete bricks with the size of 60cm by 20cm, transferring the concrete bricks into an autoclave, and vacuumizing to-0.08 MPa; and (3) introducing steam into the autoclave, heating to 200 ℃ and the pressure of 1.3MPa, and maintaining for 350min to obtain the aerated brick.
Example 2
Example 2 differs from example 1 in that example 2 does not incorporate acetylated distarch phosphate, all otherwise in accordance with example 1.
Example 3
Example 3 differs from example 1 in that example 3 does not have a thixotropic lubricant added and otherwise remains the same as example 1.
Example 4
Example 4 differs from example 1 in that example 4 does not have zeolite powder added and the rest remains the same as example 1.
Example 5
Example 5 is different from example 1 in that the concrete block in step S4 of example 5 was transferred to an autoclave and was not vacuumized, and the process was the same as example 1.
Examples 6 to 13
Examples 6 to 13 differ from example 1 in the amounts of the starting materials added and the process parameters of examples 6 to 13. The particle sizes of the admixture and slurry in examples 6-13 were consistent with those in example 1, the amounts of the raw materials added in examples 6-13 are shown in Table 2, and the process parameters in examples 6-13 are shown in Table 3.
TABLE 2 addition of the starting materials of examples 6 to 13
TABLE 3 parameters in the procedure of examples 6-13
Comparative example
Comparative example 1
Comparative example 1 differs from example 1 in that comparative example 1 did not incorporate sodium isethionate, acetylated distarch phosphate and thixotropic lubricant, the addition of comparative example 1 was not ball milled using a ball mill, and step S3 of comparative example 1 was rested at room temperature, all in keeping with example 1.
Comparative example 2
Comparative example 2 differs from comparative example 1 in that comparative example 2 extended the rest time from 180min to 480min, all else remaining the same as in comparative example 1.
Performance detection
1. Compressive strength: with reference to the method disclosed in GB/T11969-2008 "method for testing properties of autoclaved aerated concrete", test pieces with dimensions of 100mm x 100mm were made and subjected to compressive strength testing, and the results are shown in table 4.
2. Splitting tensile strength: according to the method disclosed in GB/T11969-2008 'test method for autoclaved aerated concrete performance', test pieces with the size of 100mm x 100mm are manufactured, and the splitting tensile strength is tested, and the results are shown in Table 4.
TABLE 4 comparison table of properties of different aerated bricks
In the comparative example 1, sodium isethionate, acetylated distarch phosphate and thixotropic lubricant are not added, the added materials are not subjected to ball milling by a ball mill, and the step S3 is subjected to standing treatment at room temperature, so that the prepared aerated brick product has poor compressive strength and cleavage tensile strength under the condition of short standing time, is not favorable for prolonging the service life of the product and is not favorable for market popularization of the product. Compared with the comparative example 1, the comparative example 2 prolongs the static stop time from 180min to 480min, the mechanical property of the prepared product is improved, but the mechanical property of the product is still poor, the static stop time is too long, the production efficiency is reduced, and the process cost is increased to a certain extent.
Comparing the experimental results of the example 1 and the comparative examples 1-2, it can be seen that, in the preparation process of the aerated brick, the sodium isethionate, the acetylated distarch phosphate and the thixotropic lubricant are added, and the added materials are ball-milled by a ball mill and subjected to static stop treatment at a higher temperature, so that the prepared aerated brick has excellent compression resistance and cleavage tensile strength, and is beneficial to prolonging the service life of the product.
Compared with the experimental results of the embodiment 1 and the embodiment 2, the embodiment 2 does not add the acetylated distarch phosphate, and the compression strength and the splitting tensile strength of the prepared aerated brick are reduced, so that the market popularization of the product is not facilitated. Compared with the experimental results of the embodiment 1 and the embodiment 3, the thixotropic lubricant is not added in the embodiment 3, so that the compression strength and the splitting tensile strength of the prepared aerated brick are reduced, and the market popularization of the product is not facilitated. Comparing the experimental results of example 1 and example 4, the aerated brick prepared by example 4 without adding zeolite powder has small changes in compressive strength and tensile strength at cleavage, but is not beneficial to improving the corrosion resistance of the product. Comparing the experimental results of example 1 and example 5, in example 5, no vacuum treatment is performed before steam curing, and the compressive strength and the splitting tensile strength of the prepared aerated brick are slightly reduced, which is not beneficial to product market promotion.
Compared with the embodiment 1, the embodiment 6-13 has different adding amounts of the raw materials and different process parameters, in the preparation process of the aerated brick, the hydroxyethyl sodium sulfonate, the acetylated distarch phosphate and the thixotropic lubricant are added, the added materials are subjected to ball milling treatment by a ball mill, and standing treatment is carried out at a higher temperature, so that the prepared aerated brick has excellent compression resistance and splitting tensile strength, the service life of the product is prolonged, the standing treatment time is shortened, the production efficiency is improved, the process cost is reduced to a certain extent, and the product market popularization 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 (8)
1. A method for preparing aerated bricks by using phosphogypsum is characterized by comprising the following steps:
s1 pretreatment: weighing external feeding raw materials, uniformly mixing, and performing ball milling to prepare external feeding; the external material comprises the following raw materials in parts by weight: 10-20 parts of phosphogypsum slag, 180 parts of lime powder and 0.5-1.5 parts of hydroxyethyl sodium sulfonate; weighing 140 parts by weight of 100-140 parts by weight of water, adding 150-250 parts by weight of fly ash and 200 parts by weight of sand, uniformly mixing, and performing ball milling to obtain slurry;
s2 mixing: adding the additional material into the slurry, adding the functional raw materials, and uniformly mixing to obtain concrete slurry; the functional raw materials comprise the following raw materials in parts by weight: 25-50 parts of cement and 0.3-0.8 part of aluminum powder;
s3, casting and standing: injecting the concrete slurry into a mould, standing at 50-60 ℃ for 150-;
s4 steam curing: cutting the concrete blank into concrete bricks, transferring the concrete bricks into an autoclave, and curing in water vapor at the temperature of 180-220 ℃ for 400min to obtain the aerated bricks.
2. The method for preparing aerated bricks by using phosphogypsum according to claim 1, wherein the raw materials used in the steps S1-S2 are fed according to the following weight ratio: 13-17 parts of phosphogypsum slag, 160 parts of lime powder 140-.
3. The method for preparing aerated bricks by using phosphogypsum according to claim 1, which is characterized in that: the particle size of the external feeding is not more than 160 mu m; the sand has a particle size of not more than 300 μm, and the slurry has a particle size of not more than 250 μm.
4. The method for preparing aerated bricks by using phosphogypsum according to claim 1, which is characterized in that: and S4, cutting the concrete blank into concrete bricks, transferring the concrete bricks into an autoclave, vacuumizing to-0.085 MPa to-0.07 MPa, and curing in water vapor at 220 ℃ of 180-.
5. The method for preparing aerated bricks by using phosphogypsum according to claim 1, which is characterized in that: the external material raw material also comprises 1-3 parts by weight of acetylated distarch phosphate.
6. The method for preparing aerated bricks by using phosphogypsum according to claim 5, which is characterized in that: the external feeding raw material also comprises 0.5-2.5 parts by weight of thixotropic lubricant.
7. The method for preparing aerated bricks by using phosphogypsum according to claim 1, which is characterized in that: the functional raw material also comprises 10-18 parts by weight of zeolite powder.
8. An aerated brick is characterized in that: the aerated brick prepared by the method for preparing the aerated brick by the phosphogypsum, which is disclosed by any one of claims 1 to 7.
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