CN115304339A - Autoclaved aerated concrete based on granite sand washing tail mud and preparation method thereof - Google Patents
Autoclaved aerated concrete based on granite sand washing tail mud and preparation method thereof Download PDFInfo
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- CN115304339A CN115304339A CN202210984737.6A CN202210984737A CN115304339A CN 115304339 A CN115304339 A CN 115304339A CN 202210984737 A CN202210984737 A CN 202210984737A CN 115304339 A CN115304339 A CN 115304339A
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- 239000004576 sand Substances 0.000 title claims abstract description 50
- 239000004567 concrete Substances 0.000 title claims abstract description 46
- 238000005406 washing Methods 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000010438 granite Substances 0.000 title claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 13
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 43
- 239000002270 dispersing agent Substances 0.000 claims description 24
- 239000000292 calcium oxide Substances 0.000 claims description 23
- 235000012255 calcium oxide Nutrition 0.000 claims description 23
- 239000002002 slurry Substances 0.000 claims description 18
- 239000004568 cement Substances 0.000 claims description 16
- 238000000498 ball milling Methods 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000007873 sieving Methods 0.000 claims description 10
- 239000000654 additive Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 235000019353 potassium silicate Nutrition 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000005187 foaming Methods 0.000 claims description 5
- QNVRIHYSUZMSGM-UHFFFAOYSA-N hexan-2-ol Chemical class CCCCC(C)O QNVRIHYSUZMSGM-UHFFFAOYSA-N 0.000 claims description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 4
- BSWXAWQTMPECAK-UHFFFAOYSA-N 6,6-diethyloctyl dihydrogen phosphate Chemical class CCC(CC)(CC)CCCCCOP(O)(O)=O BSWXAWQTMPECAK-UHFFFAOYSA-N 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical class [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- 239000001913 cellulose Chemical class 0.000 claims description 3
- 229920002678 cellulose Chemical class 0.000 claims description 3
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical class [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 claims description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical class [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 3
- 229940048086 sodium pyrophosphate Drugs 0.000 claims description 3
- 235000019818 tetrasodium diphosphate Nutrition 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000011449 brick Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000005476 size effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 230000003340 mental effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
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
- C04B28/02—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
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0418—Wet materials, e.g. slurries
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The autoclaved aerated concrete based on the granite sand washing tail mud and the preparation method thereof are characterized in that the sand washing tail mud is effectively treated and then used for preparing autoclaved aerated concrete blocks, the tail mud can be treated by 100 percent, the problem of difficult treatment of the sand washing tail mud is solved, the environment is protected, and the resource utilization is realized; the sand washing tail mud is fully utilized as a siliceous raw material of the autoclaved aerated concrete block, so that the problem of shortage of sand resources is solved, and waste is changed into valuable; the B07A5.0 autoclaved aerated concrete block with various properties meeting the technical requirements of GB/T11968-2020 autoclaved aerated concrete block is prepared, so that the production cost is reduced by 20-30%.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to autoclaved aerated concrete based on granite sand washing tail mud and a preparation method thereof.
Background
With the continuous development of the construction industry, the demand of the sandstone is increasing day by day. Traditional natural sand sources (such as river sand) and the like are limited in resource quantity, and a series of ecological environment problems can be caused by large-scale exploitation. In recent years, the exploitation amount of river sand is limited, so that artificial sand is used as a main source of construction sand. The main sand sources of artificial sand are granite, dolomite, quicklime and the like, common artificial sand making processes are mainly a dry method, a wet method and a semi-dry method, the dry method is gradually eliminated due to large dust pollution, and sand washing links exist in the wet method and the semi-dry method, so that a large amount of sand washing tail mud can be generated, the sand washing tail mud is mainly used for roadbed cushions or backfill mining pits, and a small part of the sand washing tail mud is used for slag bricks, ceramic raw materials and the like. Not only resource waste is caused, but also a large amount of residual medicament in the tail mud seriously pollutes water and soil.
The tail mud of the current sand washing mud after being added with the chemicals and filtered by pressure has no proper treatment mode, and most of the tail mud is directly buried, so that the resource waste is caused and the environment is polluted; only a small part of the tail mud is used for making bricks, but the treatment amount is small, the tail mud cannot be completely treated, and the prepared bricks are poor in quality and can only be used at parts with low use requirements; a small part of refined ceramic raw materials exist, but the requirement on the whiteness of the tail mud is high, the universality is poor, and the technology is immature; simultaneously, the quantity of tail mud will constantly increase, and the peripheral place that can hold the tail mud landfill of on the other hand constantly reduces, therefore the tail mud handles the degree of difficulty and will increase day by day.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide autoclaved aerated concrete based on granite sand washing tail mud and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the preparation method of the autoclaved aerated concrete based on the granite sand-washing tailing mud is characterized by comprising the following steps:
(1) And (3) sand washing tail mud treatment: mixing and stirring the washed sand tail mud and a dispersing agent uniformly, wherein the mixing amount of the dispersing agent is 1-3 per mill, obtaining slurry, dehydrating and drying, and controlling the water content within 10% to obtain tail mud A with loose material state;
(2) And (3) replacing 50-70% of siliceous sand with tail mud A, reacting with cement, quicklime, aluminum powder, an additive and water, pouring into a mold, standing, foaming for 1.5-3.5h, cutting, and curing in steam at 190-210 ℃ and 0.9-1.2MPa for 6-8h to prepare the autoclaved aerated concrete block.
As a further improvement of the invention: the dispersing agent is one or more of water glass, sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, triethylhexyl phosphoric acid, sodium dodecyl sulfate and cellulose derivatives of methyl amyl alcohol.
As a further improvement of the invention: also comprises a raw material preparation step, wherein the raw material preparation step comprises the following steps:
1) Blanking: dehydrating the sand washing tail mud to 20-30%, sieving to obtain a square-hole sieve with the granularity of 0.08mm and the residue not more than 20%, dehydrating and airing after sieving;
2) Ball milling: ball-milling the dispersant, the cement and the dehydrated tailing mud and the quicklime in the step 1) to the required fineness, wherein the screen residue of a 0.08mm square-hole sieve after ball-milling is not more than 15%;
3) Mixing: and (3) weighing the tail mud, the dispersing agent, the cement, the quicklime, the aluminum powder, the additive and the water in proportion, and adding the weighed materials into stirring equipment to obtain slurry.
As a further improvement of the invention: and the step (2) of pouring comprises the step of injecting the slurry into a mold to be molded to form a building block.
As a further improvement of the invention: in the step (2), the content of the effective calcium oxide of the quicklime is not less than 70wt%.
As a further improvement of the invention: siO of the tail mud in the step (2) 2 The content of (b) is > 65%.
The invention also provides autoclaved aerated concrete based on granite sand-washing tailing mud, which is prepared by using the preparation method.
As a further improvement of the invention: each performance of the autoclaved aerated concrete meets the technical requirements of GB/T11968-2020 autoclaved aerated concrete block.
Compared with the prior art, the invention has the beneficial effects that:
the washed sand tail mud is effectively treated and then used for preparing the autoclaved aerated concrete building block, the tail mud can be treated by 100 percent, the problem of difficult treatment of the washed sand tail mud is solved, the environment is protected, and the resource utilization is realized;
the sand washing tail mud is fully utilized as a siliceous raw material of the autoclaved aerated concrete block, so that the problem of shortage of sand resources is solved, and waste is changed into valuable;
the B07A5.0 autoclaved aerated concrete block with various properties meeting the technical requirements of GB/T11968-2020 autoclaved aerated concrete block is prepared, so that the production cost is reduced by 20-30%.
Drawings
FIG. 1 is a schematic flow chart of the preparation method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the disclosed embodiments are merely exemplary of the invention, and are not intended to be exhaustive or exhaustive. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention will now be further described with reference to the following description and examples in conjunction with the accompanying drawings: the invention provides a preparation method of autoclaved aerated concrete based on granite sand-washing tail mud, which comprises the following steps:
(1) And (3) sand washing tail mud treatment: mixing and stirring the washed sand tail mud and a dispersing agent uniformly, wherein the mixing amount of the dispersing agent is 1-3 per mill, obtaining slurry, dehydrating and drying, and controlling the water content within 10% to obtain tail mud A with loose material state;
(2) And (3) replacing 50-70% of siliceous sand with tail mud A, reacting with cement, quicklime, aluminum powder, an additive and water, pouring into a mold, standing, foaming for 1.5-3.5h, cutting, and curing in steam at 190-210 ℃ and 0.9-1.2MPa for 6-8h to prepare the autoclaved aerated concrete block.
As an embodiment of the invention, the dispersant is one or more of water glass, sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, triethylhexyl phosphoric acid, sodium dodecyl sulfate and methyl amyl alcohol cellulose derivatives.
As an embodiment of the present invention, further comprising a raw material preparation step, the raw material preparation step comprising:
1) Blanking: dehydrating the sand washing tail mud to 20-30%, sieving to obtain a square-hole sieve with the granularity of 0.08mm and the residue not more than 20%, and dehydrating and drying in the air after sieving;
2) Ball milling: ball-milling the dispersant, the cement and the dehydrated tailing mud and the quicklime in the step 1) to the required fineness, wherein the screen residue of a 0.08mm square-hole sieve after ball-milling is not more than 15%;
3) Mixing: and (3) weighing the tail mud, the dispersing agent, the cement, the quicklime, the aluminum powder, the additive and the water in proportion, and then adding the weighed materials into a stirring device to obtain slurry.
As an embodiment of the present invention, the pouring in step (2) includes pouring the slurry into a mold to form a building block.
As an embodiment of the present invention, the quicklime in the step (2) has an effective calcium oxide content of not less than 70wt%.
As an embodiment of the invention, siO of the tail mud in the step (2) 2 The content of (b) is > 65%.
The invention provides an autoclaved aerated concrete based on granite wash tailing mud, which is prepared by using the preparation method.
Various performances of the autoclaved aerated concrete prepared by the preparation method of the autoclaved aerated concrete based on granite sand washing tail mud meet the technical requirements of B07A5.0 in GB/T11968-2020 autoclaved aerated concrete Block.
The size, appearance quality, compressive strength and dry density of the prepared autoclaved aerated concrete meet the requirements of GB/T11968-2020 autoclaved aerated concrete block:
dimensional deviation:
| item | Type I | Type II |
| Length of | ±3 | ±4 |
| Width of | ±1 | ±2 |
| Height | ±1 | ±2 |
Appearance quality:
the compressive strength and the dry density meet the requirement of A5.0, the average value of the compressive strength is more than or equal to 5.0MPa, the minimum value of the compressive strength is more than or equal to 4.2MPa, and the dry density meets the requirement of A5.0B07 and is less than or equal to 750kg/m 3 ；
The drying shrinkage value is not more than 0.50mm/m; the average loss of frost resistance strength is less than or equal to 20 percent; the thermal conductivity coefficient is less than or equal to 0.18W/(m.k).
Wherein the compressive strength size effect coefficient is calculated according to the following formula:
K f the test piece size effect coefficient;
f n comparing the compression strength test value (MPa) of the test piece;
f cc the standard test piece compressive strength (MPa).
As one of the fact cases of the present invention: a preparation method of autoclaved aerated concrete based on granite sand-washing tail mud,
(1) Dehydrating the tailings after sand washing to 20-30%, sieving to obtain a residue with a square-hole sieve with the particle size of 0.08mm not more than 20%, mixing the tailings after sand washing with a dispersant in an amount of 1-3 per mill, and dehydrating and drying to obtain tailings A after sieving;
(2) Ball-milling the dispersant, cement and dehydrated tail mud and quicklime in the step 1) to a required fineness, wherein the screen residue of a 0.08mm square-hole sieve after ball-milling is not more than 15%; the dispersant is water glass;
(3) The tailing slurry, the dispersant, the cement, the quicklime, the aluminum powder, the admixture and the water are weighed in proportion and then added into a stirring device to obtain slurry A, wherein in the embodiment, each 100kg of the raw materials comprises the following components in percentage by weight: 45kg of tail mud, 7.5kg of cement, 5kg of quick lime, 2kg of aluminum powder, 1.5kg of water glass and 39kg of additives;
(4) After reaction, injecting the slurry into a mold to form a building block;
(5) Cutting after standing and foaming for 1.5-3.5 h;
(6) Curing the autoclaved aerated concrete block for 6 to 8 hours in steam with the temperature of 190 to 210 ℃ and the pressure of 0.9 to 1.2 MPa.
The cement used in the embodiment conforms to the GB 175 specification, quicklime conforms to the JC/T621 specification, sand conforms to the JC/T622 specification, fly ash conforms to the JC/T409 specification, aluminum powder conforms to the JC/T407 specification, aluminum powder conforms to the GB/T2085.2 specification, and gypsum conforms to the GB/T5483 or GB/T37785 specification.
The autoclaved aerated concrete prepared in the embodiment has the compressive strength of 5.1MPa, the dry density of 621kg/m & lt 3 & gt, the dry shrinkage value of 0.25mm/m, the mass loss after freezing of 5.6% and the thermal conductivity of 0.12W/(m & k) according to GB/T2542 wall brick test method, and meets the A5.0B07 grade requirement of GB/T11968-2020 autoclaved aerated concrete block.
As another embodiment of the present invention: a preparation method of autoclaved aerated concrete based on granite sand-washing tail mud,
(1) Dehydrating the washed sand tailing slurry to 20-30%, sieving to obtain a sieve residue with a granularity of 0.08mm and a square hole sieve of no more than 20%, mixing and stirring the washed sand tailing slurry and a dispersing agent uniformly, wherein the mixing amount of the dispersing agent is 1-3 per mill, and dehydrating and drying after sieving to obtain tailing slurry A;
(2) Ball-milling the dispersant, cement and dehydrated tail mud and quicklime in the step 1) to a required fineness, wherein the screen residue of a 0.08mm square-hole sieve after ball-milling is not more than 15%; the dispersant is water glass;
(3) The tail mud, the dispersant, the cement, the quicklime, the aluminum powder, the additive and the water are weighed in proportion and then added into a stirring device to obtain slurry A, wherein in the embodiment, each 100kg of raw materials comprises the following components in terms of dry materials: 55kg of tail mud, 8kg of cement, 5kg of quicklime, 2kg of aluminum powder, 1.5kg of water glass and sodium tripolyphosphate and 28.5kg of an additive;
(4) After reaction, injecting the slurry into a mold to form a building block;
(5) Cutting after standing and foaming for 1.5-3.5 h;
(6) Curing the autoclaved aerated concrete block for 6 to 8 hours in steam with the temperature of 190 to 210 ℃ and the pressure of 0.9 to 1.2 MPa.
The autoclaved aerated concrete prepared by the embodiment has the compressive strength of 5.1MPa, the dry density of 589kg/m & lt 3 & gt, the dry shrinkage value of 0.26mm/m, the mass loss after freezing of 6.7 percent and the thermal conductivity of 0.16W/(m.k) according to GB/T2542 'test method for wall building bricks', and meets the A5.0B07 grade requirement of GB/T11968-2020 'autoclaved aerated concrete block'.
The main functions of the invention are as follows: the washed sand tail mud is effectively treated and then used for preparing the autoclaved aerated concrete building block, the tail mud can be treated by 100 percent, the problem of difficult treatment of the washed sand tail mud is solved, the environment is protected, and the resource utilization is realized; the sand washing tail mud is fully utilized as a siliceous raw material of the autoclaved aerated concrete block, so that the problem of shortage of sand resources is solved, and waste is changed into valuable; the B07A5.0 autoclaved aerated concrete block with various properties meeting the technical requirements of GB/T11968-2020 autoclaved aerated concrete block is prepared, so that the production cost is reduced by 20-30%.
In summary, after reading the present disclosure, those skilled in the art can make various other corresponding changes without creative mental labor according to the technical solutions and concepts of the present disclosure, and all of them are within the protection scope of the present disclosure.
Claims (7)
1. A preparation method of autoclaved aerated concrete based on granite sand washing tail mud is characterized by comprising the following steps:
(1) And (3) sand washing tail mud treatment: mixing and stirring the washed sand tailing mud and a dispersing agent uniformly, wherein the mixing amount of the dispersing agent is 1-3 per mill to obtain slurry, dehydrating and drying the slurry, and controlling the water content within 10% to obtain tailing mud A with loose material state;
(2) And (3) replacing 50-70% of siliceous sand with tail mud A, reacting with cement, quicklime, aluminum powder, an additive and water, pouring into a mold, standing, foaming for 1.5-3.5h, cutting, and curing in steam at 190-210 ℃ and 0.9-1.2MPa for 6-8h to prepare the autoclaved aerated concrete block.
2. The preparation method of the autoclaved aerated concrete based on granite sand-washing tailings as claimed in claim 1, wherein the dispersant is one or more of water glass, sodium tripolyphosphate, sodium hexametaphosphate, sodium pyrophosphate, triethylhexylphosphoric acid, sodium dodecyl sulfate, and cellulose derivatives of methylpentanol.
3. The preparation method of the autoclaved aerated concrete based on granite sand-washing tailings as claimed in claim 1, further comprising a raw material preparation step, wherein the raw material preparation step comprises:
1) Blanking: dehydrating the sand washing tail mud to 20-30%, sieving to obtain a square-hole sieve with the granularity of 0.08mm and the residue not more than 20%, and dehydrating and drying in the air after sieving;
2) Ball milling: ball-milling the dispersant, the cement and the dehydrated tailing mud and the quicklime in the step 1) to the required fineness, wherein the screen residue of a 0.08mm square-hole sieve after ball-milling is not more than 15%;
3) Mixing: and (3) weighing the tail mud, the dispersing agent, the cement, the quicklime, the aluminum powder, the additive and the water in proportion, and adding the weighed materials into stirring equipment to obtain slurry.
4. The method for preparing the autoclaved aerated concrete based on granite sand-washing tailings as claimed in claim 3, wherein the step (2) of pouring comprises injecting the slurry into a mold to form a building block.
5. The preparation method of the autoclaved aerated concrete based on granite sand-washing tailing mud as claimed in claim 1, wherein in the step (2), the content of the effective calcium oxide of the quick lime is not lower than 70wt%.
6. The preparation method of the autoclaved aerated concrete based on granite sand-washing tailing mud as claimed in claim 1, wherein SiO in the tailing mud in the step (2) 2 The content of (B) is more than 65%.
7. An autoclaved aerated concrete based on granite sand washing tailings, characterized by being prepared by the preparation method of any one of claims 1 to 6.
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Cited By (1)
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| CN116283350A (en) * | 2023-03-22 | 2023-06-23 | 广东城科检测技术有限公司 | Foam concrete wallboard and preparation method thereof |
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Application publication date: 20221108 |