CN110862240A - Slag micro powder, admixture thereof, preparation method and application thereof, and cement and/or concrete - Google Patents

Slag micro powder, admixture thereof, preparation method and application thereof, and cement and/or concrete Download PDF

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Publication number
CN110862240A
CN110862240A CN201911230880.0A CN201911230880A CN110862240A CN 110862240 A CN110862240 A CN 110862240A CN 201911230880 A CN201911230880 A CN 201911230880A CN 110862240 A CN110862240 A CN 110862240A
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Prior art keywords
slag
mass
anhydrous sodium
sodium sulphate
admixture
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CN201911230880.0A
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Chinese (zh)
Inventor
窦霆
张青青
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Shandong Yongzheng Industrial Technology Research Institute Co ltd
Shandong Yongzheng New Materials Co ltd
Shandong Yongzheng Cement Co Ltd
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Shandong Yongzheng Industrial Technology Research Institute Co ltd
Shandong Yongzheng New Materials Co ltd
Shandong Yongzheng Cement Co Ltd
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Priority to CN201911230880.0A priority Critical patent/CN110862240A/en
Publication of CN110862240A publication Critical patent/CN110862240A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • 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
    • 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
    • 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

Abstract

The invention provides slag micro powder, an admixture thereof, a preparation method and application thereof, and cement and/or concrete, and relates to the technical field of cement and concrete, wherein the admixture of the slag micro powder comprises the following components: the by-products of anhydrous sodium sulphate and ceramic waste. The method utilizes the industrial waste byproduct anhydrous sodium sulphate and ceramic waste which can not be recycled in batches at present to be applied to the production of the slag micro powder, thereby not only protecting the environment, but also reducing the cost.

Description

Slag micro powder, admixture thereof, preparation method and application thereof, and cement and/or concrete
Technical Field
The invention relates to the technical field of cement and concrete, in particular to slag micro powder, an admixture thereof, a preparation method and application thereof, and cement and/or concrete.
Background
At present, a large amount of natural mineral resources are needed for producing the slag micro powder, so that the production cost of the slag micro powder is high; slag is used as a main raw material of slag micropowder, and along with the reduction of the productivity of steel plants, the slag micropowder is used as an admixture by commercial concrete enterprises to be applied to cement production and concrete engineering more and more widely, so that the demand of the slag micropowder is more and more large, and the need of finding an admixture with lower price capable of replacing part of the slag micropowder is urgently needed.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide an admixture of slag micropowder, which utilizes industrial wastes which cannot be recycled in batches at present to produce anhydrous sodium sulphate byproduct and ceramic waste to be applied to slag micropowder production, thereby protecting the environment and reducing the cost.
The admixture of slag micropowder provided by the invention comprises: the by-products of anhydrous sodium sulphate and ceramic waste.
Furthermore, the mass ratio of the by-product anhydrous sodium sulphate to the ceramic waste is (0.5-1.5%): (1% to 20%), preferably (0.8% to 1.2%): (10.0% to 15.0%), more preferably 1.0%: 13.0 percent.
Further, the by-product anhydrous sodium sulphate comprises Na with the mass fraction of more than or equal to 90 percent2SO3。
Preferably, the ceramic waste comprises the following components in mass fraction: SiO 2263.88-67.88％、Al2O325.03-21.03％、Fe2O30.58-0.98％、CaO3.26-5.26％、MgO0.78-1.78％、SO30.1-0.54% and L0SS 3.96.96-4.96%;
preferably, the ceramic wasteThe material comprises the following components in percentage by mass: SiO 2265.88％、Al2O323.03％、Fe2O30.78％、CaO 4.26％、MgO 1.28％、SO30.34% and L0SS 2.96.96%.
The superfine slag powder comprises the admixture and slag.
Further, the mass of the admixture accounts for 1.5 to 21.5 wt% of the mass of the slag.
Preferably, the by-produced anhydrous sodium sulfate accounts for 0.5 to 1.5 wt%, preferably 0.8 to 1.2 wt%, and more preferably 1.0 wt%, of the mass of the slag, and the ceramic waste accounts for 1 to 20 wt%, preferably 10.0 to 15.0 wt%, and more preferably 13.0 wt%, of the mass of the slag.
Further, the slag comprises the following components in parts by mass: SiO 2230.85％、Al2O316.80％、Fe2O30.61％、CaO 38.12％、MgO 9.07％、SO31.50% and L0 SS-1.19%.
Further, the fineness of the slag micro powder is 0.045mm screen residue 0.7-1.2%.
The preparation method of the slag micro powder comprises the following steps:
crushing the mixture of the slag and the admixture to obtain slag micropowder;
preferably, the crushing treatment comprises grinding.
Use of a slag micropowder as described above for the preparation of cement and/or concrete.
Cement and/or concrete comprising the aforesaid fine slag powder.
Compared with the prior art, the invention can at least obtain the following beneficial effects:
the invention utilizes the industrial waste byproduct anhydrous sodium sulphate and ceramic waste which can not be recycled in batches at present to be applied to the production of the slag micro powder, is beneficial to reducing the consumption of natural mineral resources, fully utilizes the industrial waste residue to solve the problems of waste land occupation, environmental pollution and the like, solves the bottleneck problems of high cost and small profit in the disposal process of the industrial solid waste, makes contribution to the environmental pollution treatment, improves the profit space for the cost saving of enterprises, and creates a brand new way for the treatment of the industrial solid waste. In addition, the activity of the slag micro powder is improved to the maximum extent by using the byproduct anhydrous sodium sulphate as an excitant, and a foundation is laid for producing high-grade cement and/or concrete.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic view of a process for producing fine slag powder according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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.
In one aspect of the present invention, there is provided an admixture for fine slag powder, comprising: the by-products of anhydrous sodium sulphate and ceramic waste.
The invention utilizes the industrial waste byproduct anhydrous sodium sulphate and ceramic waste which can not be recycled in batches at present to be applied to the production of the slag micro powder, is beneficial to reducing the consumption of natural mineral resources, fully utilizes the industrial waste residue to solve the problems of waste land occupation, environmental pollution and the like, solves the bottleneck problems of high cost and small profit in the disposal process of the industrial solid waste, makes contribution to the environmental pollution treatment, improves the profit space for the cost saving of enterprises, and creates a brand new way for the treatment of the industrial solid waste. In addition, the activity of the slag micro powder is improved to the maximum extent by using the byproduct anhydrous sodium sulphate as an excitant, and a foundation is laid for producing high-grade cement and/or concrete.
It should be noted that the mechanism of the byproduct anhydrous sodium sulphate for exciting the activity of the slag micro powder is that in an alkaline environment, the activity excitation effect of the sulfate on the slag is obvious.
In some embodiments of the invention, the mass ratio of the by-product anhydrous sodium sulphate to the ceramic waste material is (0.5% -1.5%): (1% to 20%), for example, (0.5%, 1% or 1.5%): (1%, 3%, 5%, 7%, 9%, 11%, 13%, 15%, 17%, 19%, 20%, etc.). With respect to the above content range, when the mass ratio of the by-produced anhydrous sodium sulfate to the ceramic waste is too small, the activity does not achieve the intended effect, and the cost increases; when the mass ratio of the by-product anhydrous sodium sulphate to the ceramic waste is too large, the problems of poor cement adaptability, abnormal setting time, large hydration heat and the like can be caused.
It should be noted that the ceramic waste refers to a large amount of polishing waste generated in the grinding and polishing processes of the polishing brick, the particle size of the polishing waste is very fine (micron order), the polishing waste is dispersed after being dried in the air, and the polishing waste is easy to drift everywhere along with the wind, which can seriously threaten the health of people around and cause the hardening of surrounding land, resulting in serious environmental pollution. The landfill of the polishing waste not only consumes manpower and material resources, but also pollutes the underground water quality. The polishing waste accounts for the largest proportion of building ceramic waste which is the most difficult to treat, and the building ceramic waste is generally referred to as the polishing waste.
In some preferred embodiments of the present invention, the mass ratio of the by-produced anhydrous sodium sulphate to the ceramic waste is (0.8-1.2%): (10.0-15.0%), and in some more preferred embodiments of the invention, the mass ratio of the by-produced anhydrous sodium sulphate to the ceramic waste is 1.0%: 13.0 percent.
In some embodiments of the invention, the by-product anhydrous sodium sulfate comprises 90% or more of Na by mass2SO3. Therefore, after the by-product anhydrous sodium sulphate is added into the cement, the hydrated product calcium sulphoaluminate can be generated more quickly, and then the hydration hardening speed of the cement is accelerated. The by-product anhydrous sodium sulfate is used in waterWhen in mud, the mixing amount of the sodium sulfate is generally 0.5-2% of the mass of the cement, and the early strength of the concrete can be further 50-100%.
In some embodiments of the invention, the ceramic waste comprises components having the following mass fractions: SiO 2263.88-67.88％、Al2O325.03-21.03％、Fe2O30.58-0.98％、CaO3.26-5.26％、MgO0.78-1.78％、SO30.1-0.54% and L0SS 3.96.96-4.96%; preferably, the ceramic waste comprises the following components in mass fraction: SiO 2265.88％、Al2O323.03％、Fe2O30.78％、CaO 4.26％、MgO 1.28％、SO30.34% and L0SS 2.96.96%. Therefore, the slag activity can be improved by containing the high-quality alumino-silica minerals under high-temperature calcination, and the alumino-silica minerals can be used in cement to replace part of cement clinker.
Note that LOSS in the ceramic waste refers to a material that is not completely calcined or impurities in the waste slag treatment process.
In another aspect of the present invention, there is provided fine slag powder comprising the admixture and slag as described above. Thus, the activity of the fine slag powder is excellent; the industrial waste which can not be recycled at present is used for replacing natural mineral resources to be applied to the production of the slag micro powder, so that the environment is protected, the cost is reduced, in addition, the slag micro powder contains byproduct anhydrous sodium sulphate, the activity of the slag micro powder is improved to the maximum extent by using the byproduct anhydrous sodium sulphate as an excitant, and a foundation is laid for producing high-grade cement and/or concrete.
It will be appreciated that the above slag may be a by-product from a blast furnace ironmaking process by Zibo Steel Co, Inc., Shandong Steel group.
In some embodiments of the invention, the mass of the admixture is 1.5-21.5 wt% (e.g., may be 1.5 wt%, 3 wt%, 5 wt%, 7 wt%, 9 wt%, 11 wt%, 13 wt%, 15 wt%, 17 wt%, 19 wt%, 21 wt%, 21.5 wt%, etc.) of the mass of the slag. With respect to the above content ranges, when the proportion of the mass of the admixture to the mass of the slag is less than 1.5% by weight, the activity cannot be optimized, the three-day strength is lowered, and the cement hydration speed is slow, and when the proportion of the mass of the admixture to the mass of the slag is more than 21.5% by weight, the cement hydration heat is large, the setting speed is fast, and the 28-day strength is liable to cause a decrease.
In some embodiments of the present invention, the mass of the by-produced anhydrous sodium sulphate is 0.5 to 1.5 wt% (e.g. may be 0.5 wt%, 1 wt% or 1.5 wt%, etc.), preferably 0.8 to 1.2%, further preferably 1.0% of the mass of the slag, and the mass of the ceramic waste is 1 to 20 wt% (e.g. may be 1 wt%, 3 wt%, 5 wt%, 7 wt%, 9 wt%, 11 wt%, 13 wt%, 15 wt%, 17 wt%, 19 wt% or 20 wt%, etc.), preferably 10.0 to 15.0%, further preferably 13.0% of the mass of the slag. With respect to the above content range, when the proportion of the mass of by-produced anhydrous sodium sulfate to the mass of the slag is less than 0.5 wt%, the three-day strength decreases; when the mass ratio of the by-product anhydrous sodium sulphate to the slag is higher than 1.5 wt%, the adaptability of the by-product anhydrous sodium sulphate to polycarboxylic acid admixture in concrete is poor, and the activity is reduced; when the mass of the ceramic waste accounts for more than 20 wt% of the mass of the slag, the hydration heat is poor in adaptability to the polycarboxylic acid admixture, and the activity is reduced; when the ratio of the mass of the ceramic waste to the mass of the slag is less than 1 wt%, the strength decreases for three days, and the hydration speed is slow.
In some embodiments of the invention, the slag comprises components in the following mass fractions: SiO 2230.85％、Al2O316.80％、Fe2O30.61％、CaO 38.12％、MgO 9.07％、SO31.50% and L0 SS-1.19%.
Note that LOSS in slag refers to the algebraic sum of the increase and decrease caused by a series of chemical reactions occurring upon firing at high temperatures.
In some embodiments of the present invention, the fine slag powder has a fineness of 0.7 to 1.2% (e.g., may be 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, etc.) by 0.045mm screen residue. Therefore, the slag fine powder has a large specific surface area and excellent activity.
In another aspect of the present invention, there is provided a method for producing fine slag powder as described above, comprising:
crushing the mixture of the slag and the admixture to obtain slag micropowder;
preferably, the crushing treatment comprises grinding. Therefore, the method is simple and convenient to operate, easy to realize, low in production cost and suitable for large-scale production.
In some embodiments of the present invention, referring to fig. 1, a method for preparing fine slag powder includes the steps of:
the method comprises the steps of carrying out feeding treatment on a mixture of slag, by-product anhydrous sodium sulphate (anhydrous sodium sulphate in figure 1 refers to by-product anhydrous sodium sulphate) and ceramic waste, mixing the mixture with the slag which sequentially passes through a coal breaker and a fluidized bed furnace, then sequentially drying, grinding and winnowing, collecting obtained solid powder, conveying and lifting the solid powder, and then entering a finished product warehouse.
In another aspect of the present invention, there is provided a use of the slag micropowder described above for the production of cement and/or concrete. Therefore, the method is beneficial to obtaining high-grade cement and/or concrete, and creates a brand new way for the treatment of industrial solid wastes.
In another aspect of the present invention, there is provided a cement and/or concrete comprising the above-described fine slag powder. Therefore, the grade of the cement and/or concrete is high, and the performance is excellent.
Some embodiments of the present invention will be described in detail below with reference to specific examples. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Examples
The activity test method of the slag micro powder comprises the following steps: GB/T18046-2017;
the specific surface area test method comprises the following steps: GB/T8074.
It is to be noted that, unless otherwise specified, the specific composition of the slag in the following examples and comparative examples is SiO230.85％、Al2O316.80％、Fe2O30.61％、CaO 38.12％、MgO 9.07％、SO31.50 percent and L0SS-1.19 percent, and the specific composition of the ceramic waste material is SiO265.88％、Al2O323.03％、Fe2O30.78％、CaO4.26％、MgO 1.28％、SO30.34% and L0SS 2.96.96%, and sodium sulfate and crystal water as by-product.
Example 1
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1 percent of the mass of the slag, and the mass of the ceramic waste accounts for 5 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
Example 2
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1 percent of the mass of the slag, and the mass of the ceramic waste accounts for 10 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 0.9%.
Example 3
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1 percent of the mass of the slag, and the mass of the ceramic waste accounts for 16 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 0.8%.
Example 4
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1 percent of the mass of the slag, and the mass of the ceramic waste accounts for 20 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 0.7%.
Example 5
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1 percent of the mass of the slag, and the mass of the ceramic waste accounts for 1 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
Example 6
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1 percent of the mass of the slag, and the mass of the ceramic waste accounts for 0.2 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
Example 7
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1 percent of the mass of the slag, and the mass of the ceramic waste accounts for 30 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
Example 8
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 0.5 percent of the mass of the slag, and the mass of the ceramic waste accounts for 5 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
Example 9
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1.5 percent of the mass of the slag, and the mass of the ceramic waste accounts for 5 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
Example 10
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 5 percent of the mass of the slag, and the mass of the ceramic waste accounts for 5 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
Example 11
The slag micropowder comprises:
slag, by-product anhydrous sodium sulphate and ceramic waste;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 0.2 percent of the mass of the slag, and the mass of the ceramic waste accounts for 5 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
Comparative example 1
The slag micropowder comprises:
slag and by-product anhydrous sodium sulphate;
wherein the mass of the by-product anhydrous sodium sulphate accounts for 1 percent of the mass of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.2%.
Comparative example 2
The slag micropowder comprises:
slag and ceramic waste;
wherein the mass of the ceramic waste accounts for 5% of that of the slag;
the fineness of the slag micro powder is 0.045mm, and the screen residue is less than or equal to 1.1%.
The performance parameters of the fine slag powder in examples 1 to 11 and comparative examples 1 to 2 are shown in Table 1 below:
TABLE 1
Figure BDA0002300218160000101
Figure BDA0002300218160000111
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. An admixture of slag micropowder, comprising: the by-products of anhydrous sodium sulphate and ceramic waste.
2. The admixture according to claim 1, wherein the mass ratio of by-produced anhydrous sodium sulphate to ceramic waste is (0.5-1.5%): (1% to 20%), preferably (0.8% to 1.2%): (10.0% to 15.0%), more preferably 1.0%: 13.0 percent.
3. The admixture according to claim 1 or 2, wherein the by-produced anhydrous sodium sulphate comprises 90% or more by mass of Na2SO3；
Preferably, the ceramic waste comprises the following components in mass fraction: SiO 2263.88-67.88％、Al2O325.03-21.03％、Fe2O30.58-0.98％、CaO3.26-5.26％、MgO0.78-1.78％、SO30.1-0.54% and L0SS3.96-4.96%;
preferably, the ceramic waste comprises the following components in mass fraction: SiO 2265.88％、Al2O323.03％、Fe2O30.78％、CaO 4.26％、MgO 1.28％、SO30.34% and L0SS 2.96.96%.
4. Fine slag powder comprising the admixture according to any one of claims 1 to 3 and slag.
5. Slag micropowder according to claim 4, characterized in that the mass of the admixture accounts for 1.5-21.5 wt.% of the mass of the slag;
preferably, the by-produced anhydrous sodium sulfate accounts for 0.5 to 1.5 wt%, preferably 0.8 to 1.2 wt%, and more preferably 1.0 wt%, of the mass of the slag, and the ceramic waste accounts for 1 to 20 wt%, preferably 10.0 to 15.0 wt%, and more preferably 13.0 wt%, of the mass of the slag.
6. Slag micropowder according to claim 4, characterized in that the slag comprises the following components in mass fraction: SiO 2230.85％、Al2O316.80％、Fe2O30.61％、CaO38.12％、MgO 9.07％、SO31.50% and L0 SS-1.19%.
7. Slag micropowder according to any of claims 4 to 6, characterized in that the fineness of the slag micropowder is 0.045mm screen residue 0.7-1.2%.
8. The method for producing fine slag powder according to any one of claims 4 to 7, comprising:
crushing the mixture of the slag and the admixture to obtain slag micropowder;
preferably, the crushing treatment comprises grinding.
9. Use of slag micropowder according to any of claims 4 to 7 for the preparation of cement and/or concrete.
10. A cement and/or concrete comprising the fine slag powder according to any one of claims 4 to 7.
CN201911230880.0A 2019-12-03 2019-12-03 Slag micro powder, admixture thereof, preparation method and application thereof, and cement and/or concrete Pending CN110862240A (en)

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