CN110803881A - Superfine ash, preparation method and application thereof, cement and concrete - Google Patents
Superfine ash, preparation method and application thereof, cement and concrete Download PDFInfo
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- CN110803881A CN110803881A CN201911211778.6A CN201911211778A CN110803881A CN 110803881 A CN110803881 A CN 110803881A CN 201911211778 A CN201911211778 A CN 201911211778A CN 110803881 A CN110803881 A CN 110803881A
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- 239000004568 cement Substances 0.000 title claims abstract description 35
- 239000004567 concrete Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000002956 ash Substances 0.000 claims abstract description 172
- 239000010881 fly ash Substances 0.000 claims abstract description 83
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 58
- 239000002994 raw material Substances 0.000 claims abstract description 47
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 29
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 29
- 239000006227 byproduct Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000002893 slag Substances 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 8
- 238000010298 pulverizing process Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 abstract description 8
- 238000005086 pumping Methods 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000003245 coal Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003818 cinder Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000009853 pyrometallurgy Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 150000003568 thioethers Chemical class 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
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0042—Powdery mixtures
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the field of cement additives, and particularly provides superfine ash, a preparation method and application thereof, cement and concrete. The superfine ash is mainly prepared from the following raw materials in percentage by mass: 60-90% of wet ash, 9.2-38.8% of wet fly ash and 0.8-1.2% of anhydrous sodium sulphate as a byproduct, wherein the sum of the mass percentages of the raw materials is 100%, the loss on ignition of the wet ash and the wet fly ash is 2-4% respectively, and the mass percentages of sulfur trioxide in the wet ash and the wet fly ash are 0.2-0.5% respectively. The superfine ash has the advantages of wide raw material source, low cost, low loss on ignition and sulfur trioxide content and high product quality, can reduce water demand and improve fluidity when being applied to cement or concrete production, and relieves the problems of large concrete slump and pump blockage in the pumping process.
Description
Technical Field
The invention relates to the field of cement additives, in particular to ultrafine ash, a preparation method and application thereof, cement and concrete.
Background
The fine ash particles discharged from the combustion process of fuel (mainly coal) have a particle size of 1-100 μm, and are called fly ash or soot. About 250-300 kg of fly ash is generated by burning 1t of coal, and a large amount of fly ash enters the atmosphere to cause pollution. The fly ash mainly contains silicon dioxide (SiO)2) Alumina (Al)2O3) And iron oxide (Fe)2O3) The fly ash can be widely used for preparing cement and various light building materials, and can also be used as floating beads and fertilizers and trace compound fertilizers.
At present, fly ash used for cement production is generally dry fly ash, and the price of the fly ash is gradually increased along with the increasing application range of the fly ash, particularly in the production busy seasons of cement and concrete enterprises, the demand of the fly ash is large, and the dry fly ash with high price and low product quality (such as the high ignition loss of the dry fly ash and the high content of sulfur trioxide, the large water demand and the small fluidity when being applied to cement or concrete, and the phenomena of large slump and pump blockage of concrete) can not meet the actual production demand.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide the superfine ash which has the advantages of wide raw material source, low cost, low loss on ignition and sulfur trioxide content and high product quality, can reduce water demand, improve fluidity and relieve the problems of large concrete slump and pump blockage in the pumping process when being applied to cement or concrete production.
The second purpose of the invention is to provide a preparation method of the superfine ash.
A third object of the present invention is to provide an application of the ultra-fine ash.
A fourth object of the present invention is to provide a cement or concrete.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
in a first aspect, the invention provides ultrafine ash which is mainly prepared from the following raw materials in percentage by mass: 60-90% of wet ash, 9.2-38.8% of wet fly ash and 0.8-1.2% of anhydrous sodium sulphate as a byproduct, wherein the sum of the mass percentages of the raw materials is 100%, the loss on ignition of the wet ash and the wet fly ash is 2-4% respectively, and the mass percentages of sulfur trioxide in the wet ash and the wet fly ash are 0.2-0.5% respectively.
As a preferred technical scheme, the superfine ash is mainly prepared from the following raw materials in percentage by mass: 65-80% of wet ash, 19.2-33.8% of wet fly ash and 0.8-1.2% of byproduct anhydrous sodium sulphate, wherein the sum of the mass percentages of the raw materials is 100%;
preferably, the superfine ash is mainly prepared from the following raw materials in percentage by mass: 70-80% of wet ash, 19.2-28.8% of wet fly ash and 0.8-1.2% of byproduct anhydrous sodium sulphate, wherein the total mass percentage of all the raw materials is 100%.
As a preferred technical solution, the raw material further comprises slag;
preferably, the mass percent of the slag is 0-10%, excluding 0, preferably 5-10%, and the sum of the mass percent of the raw materials is 100%.
As a preferred technical scheme, the moisture content of wet ash is 8-10%;
preferably, the wet fly ash has a water content of 2-3%.
As a preferred technical scheme, the particle size of wet ash is as follows: 62-67% of 0.08mm square hole screen residue, 20-30% of 0.3mm square hole screen residue and 3-4% of 3.2mm square hole screen residue;
preferably, the particle size of the wet fly ash is: 10-20% of 0.08mm square hole screen residue, 0.3-0.6% of 0.3mm square hole screen residue and 0% of 3.2mm square hole screen residue;
preferably, the particle size of the slag is: 85-90% of 0.08mm square hole screen residue, 40-45% of 0.3mm square hole screen residue and 10-12% of 3.2mm square hole screen residue.
As a preferred technical solution, the particle size of the ultrafine ash is: 0.045 mu m square hole screen residue 1-2%, 0.08mm square hole screen residue 0.05-0.2%.
In a second aspect, the present invention provides a method for preparing the above superfine ash, comprising: mixing the raw materials and crushing to obtain the superfine ash.
As a preferred technical solution, the crushing apparatus comprises a vertical mill;
preferably, the mass percentage of the water added into the vertical mill is 10-12%.
In a third aspect, the invention provides an application of the superfine ash or the superfine ash obtained by the preparation method in preparing cement;
or the application of the superfine ash or the superfine ash obtained by the preparation method in preparing concrete.
In a fourth aspect, the invention provides a cement comprising the above superfine ash or the superfine ash obtained by the above preparation method;
or, a concrete comprising the above ultrafine ash or the ultrafine ash obtained by the above preparation method.
Compared with the prior art, the invention has the beneficial effects that:
the ultrafine ash provided by the invention is mainly prepared from wet ash, wet fly ash and a byproduct anhydrous sodium sulphate with specific contents, the loss on ignition and the sulfur trioxide content of the wet ash and the wet fly ash are low, so that the loss on ignition and the sulfur trioxide content of the ultrafine ash can be ensured to be at a low level, the product quality is high, the ultrafine ash can be applied to the production of cement or concrete to reduce the water demand and improve the fluidity, and the byproduct anhydrous sodium sulphate can improve the activity and the fluidity of the ultrafine ash and relieve the problems of large slump of the concrete and pump blockage in the pumping process. In addition, the sources of the wet ash, the wet fly ash and the byproduct anhydrous sodium sulphate are wide, the cost of the superfine ash can be reduced, and the problems of pollution and occupied area of the wet ash and the wet fly ash can be effectively relieved.
When the loss on ignition is too high, the carbon content in the superfine ash is too high, the water demand of cement is too high, the water-cement ratio is too high, and the full exertion of the effect of the superfine ash is influenced; too high a mass percentage of sulfur trioxide will increase the setting time of the cement.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer.
According to one aspect of the invention, the ultrafine ash is mainly prepared from the following raw materials in percentage by mass: 60-90% of wet ash, 9.2-38.8% of wet fly ash and 0.8-1.2% of anhydrous sodium sulphate as a byproduct, wherein the sum of the mass percentages of the raw materials is 100%, the loss on ignition of the wet ash and the wet fly ash is 2-4% respectively, and the mass percentages of sulfur trioxide in the wet ash and the wet fly ash are 0.2-0.5% respectively.
The superfine ash is mainly prepared from wet ash, wet fly ash and a byproduct anhydrous sodium sulphate with specific contents, the ignition loss and the sulfur trioxide content of the wet ash and the wet fly ash are low, so that the ignition loss and the sulfur trioxide content of the superfine ash can be ensured to be low, the product quality is high, the superfine ash can be applied to cement or concrete production to reduce water demand and improve fluidity, and the byproduct anhydrous sodium sulphate can improve the activity and fluidity of the superfine ash and relieve the problems of large slump of concrete and pump blockage in a pumping process. In addition, the sources of the wet ash, the wet fly ash and the byproduct anhydrous sodium sulphate are wide, the cost of the superfine ash can be reduced, and the problems of pollution and occupied area of the wet ash and the wet fly ash can be effectively relieved.
When the loss on ignition is too high, the carbon content in the superfine ash is too high, the water demand of cement is too high, the water-cement ratio is too high, and the full exertion of the effect of the superfine ash is influenced; too high a mass percentage of sulfur trioxide will increase the setting time of the cement.
The "wet ash" refers to a mixture of wet furnace ash and lime.
The term "wet fly ash" as used herein refers to wet fly ash.
The "anhydrous sodium sulfate byproduct" refers to a product in which the main product formed after the synthesis of sulfate radicals and sodium ions is sodium sulfate.
In the present invention, the content of wet ash is typically, but not limited to, 60%, 62%, 65%, 70%, 75%, 78%, 80%, 82%, 85% or 90% by mass; the content of wet fly ash is typically, but not limited to, 9.2%, 10%, 15%, 20%, 25%, 30%, 35% or 38.8%; the content of by-produced anhydrous sodium sulphate is typically, but not limited to, 0.8%, 0.9%, 1%, 1.1% or 1.2%. The loss on ignition of wet coal cinder or wet fly ash is typically, but not limited to, 2%, 2.2%, 2.4%, 2.6%, 2.8%, 3%, 3.2%, 3.4%, 3.6%, 3.8%, or 4%; the sulfur trioxide content in wet ash or wet fly ash is typically, but not limited to, 0.2%, 0.23%, 0.25%, 0.27%, 0.3%, 0.32%, 0.35%, 0.38%, 0.4%, 0.42%, 0.45%, 0.48%, or 0.5% by weight.
In a preferred embodiment, the superfine ash is mainly prepared from the following raw materials in percentage by mass: 65-80% of wet ash, 19.2-33.8% of wet fly ash and 0.8-1.2% of byproduct anhydrous sodium sulphate, wherein the sum of the mass percentages of the raw materials is 100%;
preferably, the superfine ash is mainly prepared from the following raw materials in percentage by mass: 70-80% of wet ash, 19.2-28.8% of wet fly ash and 0.8-1.2% of byproduct anhydrous sodium sulphate, wherein the total mass percentage of all the raw materials is 100%.
The contents of wet ash, wet fly ash and by-product anhydrous sodium sulphate are further optimized, so that the cooperation of the wet ash, the wet fly ash and the by-product anhydrous sodium sulphate is more scientific and reasonable, the ignition loss and the sulfur trioxide content of the obtained superfine ash are in a lower range, the performance of the superfine ash is better, the water demand ratio of cement or concrete is favorably further reduced, and the fluidity of the cement or concrete is further improved.
In a preferred embodiment, the feedstock further comprises slag. The slag is also called slag, which is a melt floating on the surface of liquid substances such as metals and the like generated in the pyrometallurgical process, and the slag has stable chemical properties, wherein the composition of the melt is mainly oxides (silicon dioxide, aluminum oxide, calcium oxide and magnesium oxide), also often contains sulfides and carries a small amount of metals. The quantity of the slag generated in the metal smelting process is large, the environmental pressure caused by direct abandonment is large, the slag is added into the superfine ash to further enrich the composition of the superfine ash, and the water quantity required to be added in the preparation process of the superfine ash can be reduced by the slag, so that the preparation cost of the superfine ash can be reduced.
Preferably, the mass percent of the slag is 0-10%, excluding 0, preferably 5-10%, and the sum of the mass percent of the raw materials is 100%. The content of the slag is not suitable to be too high, and the activity is reduced, the water storage capacity is high, and the slump is large. The slag is typically, but not limited to, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10% by weight.
In a preferred embodiment, the moisture content of the wet ash is 8-10%. The above water content is the mass percentage of water in the wet ash to the total wet ash, and is typically, but not limited to, 8%, 8.2%, 8.4%, 8.6%, 8.8%, 9%, 9.2%, 9.4%, 9.6%, 9.8%, or 10%.
Preferably, the wet fly ash has a water content of 2-3%. The above water content is the mass percent of water in the wet fly ash based on the total wet fly ash, and is typically, but not limited to, 2%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, or 3%.
When the moisture content of the wet ash or wet fly ash is within the above range, the production cost can be reduced, and the coal consumption can be saved. The low water content is unfavorable for the production of the vertical mill, water needs to be added separately, the high water content increases the cost, and the cost of drying is increased.
In a preferred embodiment, the particle size of the wet ash is: 62-67% of 0.08mm square hole screen residue, 20-30% of 0.3mm square hole screen residue and 3-4% of 3.2mm square hole screen residue. In wet ash, the 0.08mm square hole screen residue may be, for example, 62%, 63%, 64%, 65%, 66% or 67%; the 0.3mm square hole screen residue may be, for example, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, or 30%; the 3.2mm square hole screen residue may be, for example, 3%, 3.1%, 3.2%, 3.3%, 3.4%, 3.5%, 3.6%, 3.7%, 3.8%, 3.9%, or 4%.
Preferably, the particle size of the wet fly ash is: 10-20% of 0.08mm square hole screen residue, 0.3-0.6% of 0.3mm square hole screen residue and 0% of 3.2mm square hole screen residue. In wet fly ash, the 0.08mm square hole screen residue may be, for example, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, or 20%; the 0.3mm square hole screen residue may be, for example, 0.3%, 0.4%, 0.5%, or 0.6%; the residue on the 3.2mm square hole sieve is 0.
Preferably, the particle size of the slag is: 85-90% of 0.08mm square hole screen residue, 40-45% of 0.3mm square hole screen residue and 10-12% of 3.2mm square hole screen residue. In the slag, the 0.08mm square hole screen residue may be, for example, 85%, 86%, 87%, 88%, 89%, or 90%; the 0.3mm square hole screen residue may be, for example, 40%, 41%, 42%, 43%, 44%, or 45%; the 3.2mm square hole screen residue may be, for example, 10%, 10.5%, 11%, 11.5% or 12%.
When the particle size of the wet ash, wet fly ash or slag is within the above range, the particle size of each raw material is smaller, which is beneficial to reducing the working procedures in the preparation process of the superfine ash and reducing the preparation difficulty.
In a preferred embodiment, the particle size of the ultra-fine ash is: 0.045 mu m square hole screen residue 1-2%, 0.08mm square hole screen residue 0.05-0.2%. In the ultrafine ash, the 0.045 μm square-hole screen residue may be, for example, 1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%; the 0.08mm square hole screen residue may be, for example, 0.05%, 0.1%, 0.15% or 0.2%. The superfine ash has very small grain size and large specific surface area, is favorable for fully wrapping sand and stone, is full of aggregate gaps, and increases compactness. The activity effect of the superfine ash is fully exerted to improve the strength of the concrete.
It should be noted that: the above-mentioned "0.08 mm square hole screen residue" refers to the screen residue of a material after passing through a square hole screen with a pore diameter of 0.08mm, and the screen residue is the volume percentage content or the mass percentage content, and for the same material, the numerical values of the volume percentage content or the mass percentage content are the same. Similarly, the above "0.3 mm square hole screen residue" refers to the screen residue of the material after passing through a square hole screen with the aperture of 0.3 mm; the 3.2mm square hole screen residue refers to the screen residue of the material after passing through a square hole screen with the aperture of 3.2 mm; the above-mentioned "0.045 μm square-hole screen residue" means the screen residue of the material after passing through a square-hole screen with a pore size of 0.045 μm.
Alternatively, the chemical composition of the power plant dry fly ash, wet ash, slag, wet fly ash is shown in table 1.
TABLE 1
Note: LOSS: loss on ignition, Loss on ignition; the contents of the other components are all mass percent.
According to another aspect of the present invention, there is provided a method for preparing the above ultrafine ash, comprising: mixing the raw materials and crushing to obtain the superfine ash. The method has simple process, is suitable for mass production, has low production cost, and the obtained superfine ash has the advantages of low loss on ignition, low content of sulfur trioxide and high product quality.
The above "mixing and pulverizing the respective raw materials" includes three cases: firstly, mixing all the raw materials, and then crushing; secondly, crushing the raw materials and then mixing; thirdly, the raw materials are crushed and mixed simultaneously.
In a preferred embodiment, the comminution apparatus comprises a vertical mill. The vertical mill is a device integrating crushing, drying, grinding and grading conveying, and has high production efficiency and low drying cost.
Preferably, the mass percentage of the water added into the vertical mill is 10-12%. The mass percentage of the water is the percentage of the mass of the water in the total mass of the water and the raw materials in the vertical mill. The above-mentioned water content is typically, but not limited to, 10%, 10.5%, 11%, 11.5% or 12% by mass. By controlling the addition amount of water within the above range, the subsequent drying cost can be further reduced, and energy can be saved.
According to another aspect of the present invention, there is provided a use of the above ultra fine ash for preparing cement or for preparing concrete. The superfine ash is applied to the preparation of cement or concrete, so that the preparation cost can be effectively reduced, the water demand is reduced, the fluidity is improved, and the defects of high slump of concrete, easiness in pump blockage and the like are effectively overcome.
According to another aspect of the present invention, there is provided a cement or concrete comprising the above ultra-fine ash. The cement or concrete comprises the superfine ash, so the cement or concrete has the advantages of low cost, small water demand, high fluidity, small concrete slump, difficult pump blockage and the like.
The concrete application method of the ultrafine ash in preparing cement or concrete and the content of the ultrafine ash in cement or concrete are not particularly limited, and the process or content commonly used in the field can be adopted.
The present invention will be described in further detail with reference to examples and comparative examples.
Example 1
The superfine ash is mainly prepared from the following raw materials in percentage by mass: 60% of wet ash, 38.8% of wet fly ash and 1.2% of anhydrous sodium sulphate as a byproduct, wherein the loss on ignition of the wet ash and the wet fly ash is respectively 2% and 4%, and the mass percentages of sulfur trioxide in the wet ash and the wet fly ash are respectively 0.2% and 0.5%; the moisture content of the wet ash is 5 percent, and the moisture content of the wet fly ash is 5 percent; the particle size of wet ash is as follows: 70% of 0.08mm square hole screen residue, 32% of 0.3mm square hole screen residue and 5% of 3.2mm square hole screen residue; the particle size of the wet fly ash is as follows: 22% of 0.08mm square hole screen residue, 0.8% of 0.3mm square hole screen residue and 0% of 3.2mm square hole screen residue; the particle size of the superfine ash is as follows: 3% of 0.045 mu m square hole screen residue and 0.5% of 0.08mm square hole screen residue.
Example 2
The superfine ash is mainly prepared from the following raw materials in percentage by mass: 90% of wet ash, 9.2% of wet fly ash and 0.8% of anhydrous sodium sulphate as a byproduct, wherein the loss on ignition of the wet ash and the wet fly ash is respectively 4% and 2%, the mass percentages of sulfur trioxide in the wet ash and the wet fly ash are respectively 0.5% and 0.2%, and the balance is the same as that in the embodiment 1.
Example 3
The superfine ash is mainly prepared from the following raw materials in percentage by mass: 75% of wet ash, 24% of wet fly ash and 1% of anhydrous sodium sulphate as a byproduct, wherein the loss on ignition of the wet ash and the wet fly ash are respectively 2.8% and 2.5%, the mass percentages of sulfur trioxide in the wet ash and the wet fly ash are respectively 0.2% and 0.3%, and the balance is the same as that in the example 1.
The contents of wet ash and wet fly ash in this example are within the preferred range of the present invention.
Example 4
The superfine ash is mainly prepared from the following raw materials in percentage by mass: 73% of wet ash, 24% of wet fly ash, 1% of anhydrous sodium sulphate as a byproduct and 2% of furnace slag, wherein the particle size of the furnace slag is as follows: 91% of 0.08mm square hole screen residue, 47% of 0.3mm square hole screen residue, 15% of 3.2mm square hole screen residue, and the rest are the same as those in example 3.
Example 5
The superfine ash is mainly prepared from the following raw materials in percentage by mass: 70% of wet ash, 14% of wet fly ash, 1% of anhydrous sodium sulphate as a byproduct and 15% of furnace slag, wherein the particle size of the furnace slag is as follows: 91% of 0.08mm square hole screen residue, 47% of 0.3mm square hole screen residue, 15% of 3.2mm square hole screen residue, and the rest are the same as those in example 3.
Slag was added to the feed in each of examples 4-5.
Example 6
The superfine ash is mainly prepared from the following raw materials in percentage by mass: 70 percent of wet ash, 19.2 percent of wet fly ash, 0.8 percent of by-product anhydrous sodium sulphate and 10 percent of slag, and the rest is the same as that of the embodiment 4.
The contents of wet ash, wet fly ash and slag in this example are all within the further preferred ranges of the present invention.
Example 7
The superfine ash comprises the following wet ash residues in particle size: 65% of 0.08mm square hole screen residue, 24% of 0.3mm square hole screen residue and 3.2% of 3.2mm square hole screen residue; the particle size of the wet fly ash is as follows: 12% of 0.08mm square hole screen residue, 0.3% of 0.3mm square hole screen residue and 0% of 3.2mm square hole screen residue; the grain size of the slag is: 86% of 0.08mm square hole rejects, 42% of 0.3mm square hole rejects, 11% of 3.2mm square hole rejects, and the rest is the same as in example 6.
In this example, the particle sizes of the wet ash, wet fly ash and slag are all within the preferred range of the present invention.
Example 8
An ultrafine ash, the particle size of the ultrafine ash is as follows: 0.045 μm square mesh screen residue 1.4%, 0.08mm square mesh screen residue 0.1%, and the rest was the same as in example 7.
The particle size of the ultra-fine ash in this example is within the preferred range of the present invention.
The preparation method of the superfine ash comprises the following steps: mixing the raw materials, and grinding by using a Raymond mill to obtain superfine ash.
Example 9
A preparation method of superfine ash comprises the following steps of putting the raw materials into a vertical mill (10 mass percent of water is added into the vertical mill) according to the formula of the example 8, and grinding and mixing the raw materials to obtain the superfine ash.
Comparative example 1
The superfine ash is mainly prepared from the following raw materials in percentage by mass: 50% of wet ash, 45% of wet fly ash and 5% of anhydrous sodium sulphate as a byproduct, and the rest is the same as that of the embodiment 1.
The contents of wet coal cinder, wet fly ash and by-product anhydrous sodium sulphate in the comparative example are out of the ranges provided by the invention.
Comparative example 2
The loss on ignition of the ultrafine ash, wet ash and wet fly ash were 5%, and the rest was the same as in example 1.
The loss on ignition of the wet ash and wet fly ash in this comparative example is outside the range provided by the present invention.
Comparative example 3
The mass percentage of sulfur trioxide in the ultrafine ash, wet ash and wet fly ash is 1%, and the rest is the same as that in the embodiment 1.
The sulfur trioxide content in the wet ash and wet fly ash in this comparative example by mass is outside the range provided by the present invention.
The method for preparing the ultra-fine ash of the above comparative example was the same as that of example 1.
Comparative example 4
The particle size of the dry coal ash of a certain power plant is as follows: 17.1 percent of 0.045 mu m square hole screen residue, 3.2 percent of 0.08mm square hole screen residue, 18.25 percent of loss on ignition and 1.25 percent of sulfur trioxide by mass.
The performance test of the ultrafine ash or the dry coal ash of a certain power plant in each embodiment and each comparative example is respectively carried out, and the test method comprises the following steps: the activity index and the water demand ratio are carried out according to GB/T1596-2005; the loss on ignition is carried out according to GB/T176; the sulfur trioxide is carried out by the gravimetric method of barium sulfate. The test results are shown in Table 2.
TABLE 2
As can be seen from Table 2, the water demand ratio, loss on ignition, SO of the ultrafine ashes in each example3The comprehensive properties of content, activity and fluidity are superior to those of each proportion, so that the superfine ash provided by the invention has high quality, is suitable for being applied to cement and concrete, and is beneficial to reducing the water demand ratio, improving the fluidity and reducing the production cost.
Further, the comprehensive performance of example 3 is superior to that of examples 1-2, which shows that the performance of the ultrafine ash can be further improved by further optimizing the contents of wet ash, wet fly ash and by-product anhydrous sodium sulphate; the overall performance of examples 4-5 is better than that of example 3, indicating that the performance of the ultra-fine ash can be further improved by further adding slag to the raw material; the overall performance of examples 6-9 is improved in order, demonstrating that the performance of the ultra-fine ash can be further improved by optimizing the content of each raw material, the particle size of the ultra-fine ash, and the preparation method.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (10)
1. The superfine ash is characterized by being mainly prepared from the following raw materials in percentage by mass: 60-90% of wet ash, 9.2-38.8% of wet fly ash and 0.8-1.2% of anhydrous sodium sulphate as a byproduct, wherein the sum of the mass percentages of the raw materials is 100%, the loss on ignition of the wet ash and the wet fly ash is 2-4% respectively, and the mass percentages of sulfur trioxide in the wet ash and the wet fly ash are 0.2-0.5% respectively.
2. The superfine ash of claim 1, wherein the superfine ash is prepared from the following raw materials in percentage by mass: 65-80% of wet ash, 19.2-33.8% of wet fly ash and 0.8-1.2% of byproduct anhydrous sodium sulphate, wherein the sum of the mass percentages of the raw materials is 100%;
preferably, the superfine ash is mainly prepared from the following raw materials in percentage by mass: 70-80% of wet ash, 19.2-28.8% of wet fly ash and 0.8-1.2% of byproduct anhydrous sodium sulphate, wherein the total mass percentage of all the raw materials is 100%.
3. The ultra-fine ash of claim 1, wherein said feedstock further comprises slag;
preferably, the mass percent of the slag is 0-10%, excluding 0, preferably 5-10%, and the sum of the mass percent of the raw materials is 100%.
4. The ultra fine ash of claim 1, wherein the moisture content of wet ash is 8-10%;
preferably, the wet fly ash has a water content of 2-3%.
5. The ultrafine ash according to any one of claims 1 to 4, wherein the particle size of the wet ash is: 62-67% of 0.08mm square hole screen residue, 20-30% of 0.3mm square hole screen residue and 3-4% of 3.2mm square hole screen residue;
preferably, the particle size of the wet fly ash is: 10-20% of 0.08mm square hole screen residue, 0.3-0.6% of 0.3mm square hole screen residue and 0% of 3.2mm square hole screen residue;
preferably, the particle size of the slag is: 85-90% of 0.08mm square hole screen residue, 40-45% of 0.3mm square hole screen residue and 10-12% of 3.2mm square hole screen residue.
6. The ultra-fine ash as claimed in claim 1, wherein the particle size of the ultra-fine ash is: 0.045 mu m square hole screen residue 1-2%, 0.08mm square hole screen residue 0.05-0.2%.
7. The method for producing the ultrafine ash according to any one of claims 1 to 6, comprising: mixing the raw materials and crushing to obtain the superfine ash.
8. The method for preparing ultrafine ash according to claim 7, wherein the pulverization apparatus comprises a vertical mill;
preferably, the mass percentage of the water added into the vertical mill is 10-12%.
9. Use of the ultra-fine ash of any one of claims 1 to 6 or obtained by the method of claim 7 or 8 for the preparation of cement;
or, the use of the ultra-fine ash of any one of claims 1 to 6 or obtained by the method of claim 7 or 8 for the preparation of concrete.
10. A cement comprising the ultrafine ash according to any one of claims 1 to 6 or the ultrafine ash obtained by the production method according to claim 7 or 8;
or, a concrete comprising the ultrafine ash according to any one of claims 1 to 6 or the ultrafine ash obtained by the production method according to claim 7 or 8.
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