CN108585573B - Preparation method of composite active admixture for concrete - Google Patents
Preparation method of composite active admixture for concrete Download PDFInfo
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- CN108585573B CN108585573B CN201810463812.8A CN201810463812A CN108585573B CN 108585573 B CN108585573 B CN 108585573B CN 201810463812 A CN201810463812 A CN 201810463812A CN 108585573 B CN108585573 B CN 108585573B
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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
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
-
- 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
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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
- 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
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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
- 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
- C04B20/04—Heat treatment
- C04B20/06—Expanding clay, perlite, vermiculite or like granular materials
- C04B20/068—Selection of ingredients added before or during the thermal treatment, e.g. expansion promoting agents or particle-coating materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a preparation method of a composite active admixture for concrete, which comprises the working procedures of crushing, drying, magnetic separation, roasting, cooling, secondary crushing, grinding and the like. Firstly, separating metallic ferronickel particles mixed in the ferronickel slag by magnetic separation, and preparing the ferronickel slag-based composite activating admixture with excellent performance for concrete by light-burning activating roasting and mechanical grinding-chemical excitation of the residual ferronickel slag. And mixing the nickel-iron slag subjected to magnetic separation with a roasting activating auxiliary agent, roasting at 300-600 ℃ for 10-30 min, and crushing to a diameter of less than 1 mm. Finally, the mixture is mixed and ground with tailing micro powder, fly ash, slag, exciting agent and grinding aid to prepare the material with the specific surface area not less than 400m2The activity index of the compound active admixture per kg meets the requirements of relevant standards. Compared with the prior art, the technology has the advantages of wide raw material source, high technology fusion degree, simple process, low energy consumption and considerable technology economy.
Description
Technical Field
The invention relates to the technical field of comprehensive utilization of metallurgical waste residue resources, and particularly relates to a process method for preparing a ferronickel residue-based composite active admixture for concrete by using roasted ferronickel residue.
Background
The nickel-iron slag is metallurgical slag obtained by reduction extraction of nickel-iron alloy, and the chemical components of the nickel-iron slag are mainly SiO2、Fe2O3、CaO、Al2O3And the like. Usually, after being discharged from a smelting furnace, the slag is quenched by water so that the slag contains a large amount of glassy mineral phases, has potential hydration activity in an alkaline environment and can be used as concrete active admixture. However, the ferronickel slag has high silicon content and contains various non-active minerals difficult to grind, such as the impure iron forsterite and the like, so that the ferronickel slag has very high activity in practical applicationLow, thereby limiting their use as active admixtures. So that the application of the filler, the aggregate and the like in roads or concrete products is mainly used, the economic value is very low, and the utilization rate is not high.
At present, the industrial solid wastes which are used as concrete active admixture and are applied in large quantity are mainly slag, fly ash, bottom slag and the like. The utilization technology is mature, the performance is stable, but the cost of raw materials is relatively high. Therefore, the technology for activating the ferronickel slag and developing the ferronickel slag as the concrete active admixture can not only solve the adverse effect of the ferronickel slag waste on the environment, but also reduce the cost and enlarge the application source of raw materials.
At present, the research on the ferronickel slag in the aspect mainly aims at improving the potential activity of the ferronickel slag, and the activity excitation of the ferronickel slag is achieved by mechanical grinding or adding one or more chemical reagents as an exciting agent, but the consumption of the chemical reagents is better, and the cost is high. In patent CN 104030633A, Ni slag powder and Ni slag sand are used to replace partial raw materials in concrete, so that the production cost is reduced, but the Ni-Fe slag is not subjected to activity excitation treatment, and the strength of the prepared concrete is only in the grade of common C20-C40. Patent CN 105016690A "a method for producing concrete by using water-quenched nickel iron slag", aims at the water-quenched nickel iron slag generated by the pyrometallurgy of laterite-nickel ore, and respectively replaces and utilizes the fine slag and the coarse slag by grinding and grading. After the fine slag is added with 0.1-10% of exciting agent, the activity of the slag is excited to replace part of cement, and the coarse slag replaces part of sand and stone fine aggregate. Although the invention comprehensively utilizes the active components and the inactive components of the ferronickel slag, the dosage of the excitant is higher. In patent CN 105063362A, "a method for preparing active nickel slag", the nickel-iron slag is also laterite-nickel ore pyrometallurgy slag, and the aim of improving the hydration activity of the nickel-iron slag is achieved by adding a modifier and a magnesium stabilizer. Wherein, the dosage of the activating agent is 10-30% of the content of the ferronickel slag, the dosage of the magnesium stabilizing agent is also 10-30% of the content of the ferronickel slag, but the dosage of the exciting agent is larger, and the cost is higher.
Disclosure of Invention
The invention aims to prepare a concrete composite active admixture by using nickel-iron slag, separate nickel-iron metal in the nickel-iron slag and improve the activity of the nickel-iron slag-based composite admixture. Wide raw material source, simple preparation process, low energy consumption and considerable economic value.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of a composite active admixture for concrete comprises the following steps:
(1) crushing: firstly, crushing ferronickel raw slag until the particle diameter is less than 5 mm;
(2) drying: drying the ferronickel slag obtained in the step (1), wherein the drying temperature is 105-150 ℃, and the drying time is 6-12 h;
(3) magnetic separation: feeding the dried ferronickel slag obtained in the step (2) into a magnetic separator for magnetic separation, wherein the magnetic field intensity is 120-140 kA/m, and obtaining ferronickel metal particles mixed in the ferronickel slag, and returning the ferronickel metal particles as a metal ferronickel raw material to a factory for smelting;
(4) roasting: adding a roasting activating auxiliary agent into the residual ferronickel slag subjected to magnetic separation in the step (3), uniformly mixing, and roasting to obtain light-burned ferronickel slag;
(5) and (3) cooling: taking out the light-burned ferronickel slag obtained in the step (4), and rapidly cooling to room temperature;
(6) secondary crushing: crushing the ferronickel slag obtained in the step (5) again, wherein the particle size is less than 1 mm;
(7) grinding: and (4) adding tailing micropowder, fly ash, slag, an exciting agent and a grinding aid into the ferronickel slag powder obtained in the step (6), and then mixing and grinding to obtain the ferronickel slag-based composite active admixture.
Optionally, in the step (4), the roasting temperature of the ferronickel slag is 300-600 ℃, the heating rate is 20-50 ℃/min, and the roasting heat preservation time is 10-30 min.
Optionally, before roasting the ferronickel slag in the step (4), a roasting activation aid accounting for 1-20% of the weight of the ferronickel slag is added into the ferronickel slag.
Optionally, the roasting co-agent comprises one or more of an alkali/alkaline earth metal oxide or salt; or the roasting activation auxiliary agent is industrial solid waste rich in alkali/alkaline earth metal oxides or salts.
Optionally, the calcination activating assistant comprises CaF2、Na2O、Na2CO3、CaO、K2CO3Fluorite or feldspar; or the roasting activation auxiliary agent comprises steel slag, waste glass or stone powder.
Optionally, the quenching in the step (5) adopts dry cooling or wet cooling, and when wet cooling is adopted, a secondary drying process is added after the wet cooling, wherein the drying temperature is 105-150 ℃.
Optionally, the specific surface area of the nickel-iron slag-based composite active admixture obtained in the step (7) is not less than 400m2/kg。
Optionally, in the ferronickel slag-based composite active admixture obtained in the step (7), the weight of each raw material is as follows: 50-80% of light-burned ferronickel slag powder, 10-40% of tailing micropowder, 20-40% of fly ash, 10-35% of slag, 0.02-1% of grinding aid and 0-10% of active excitant.
Optionally, the grinding aid used in step (7) comprises one or more of an ionic industrial salt or a polymeric chemical.
Optionally, in the step (7), the specific surface area of the doped tailing micro powder is not less than 500m in weight2Kg, chemical composition SiO2、Al2O3And Fe2O3The total amount is not less than 70%; in the doped fly ash, SiO2Not less than 50% of Al2O3The content is not less than 20 percent, and the content of glass phase is not less than 30 percent; in the slag, SiO2Not less than 30 percent of CaO, not less than 35 percent of Al2O3The content is not less than 10 percent, and the content of the glass phase is not less than 85 percent.
The invention has the following beneficial effects: compared with the prior art, the method improves the activity and the grindability of the slag by activating and roasting the nickel-iron slag at low temperature, comprehensively utilizes various industrial solid waste raw materials, and has the characteristics of simple process, wide raw material source, low energy consumption in the treatment process and the like.
Drawings
FIG. 1 is a process flow diagram of a method for preparing a composite reactive admixture for concrete according to the present invention;
Detailed Description
The technical solution of the present invention is further described below with reference to the following embodiments and the accompanying drawings.
Example 1
The embodiment provides a preparation method of a composite active admixture for concrete, which comprises the following steps:
(1) crushing: firstly, crushing ferronickel raw slag until the particle diameter is less than 5 mm;
(2) drying: drying the ferronickel slag obtained in the step (1), wherein the drying temperature is 105-150 ℃, and the drying time is 6-12 h;
(3) magnetic separation: feeding the dried ferronickel slag obtained in the step (2) into a magnetic separator for magnetic separation, wherein the magnetic field intensity is 120-140 kA/m, and obtaining ferronickel metal particles mixed in the ferronickel slag, which can be used as a metal ferronickel raw material to be returned to a factory for smelting;
(4) roasting: adding a roasting activating auxiliary agent into the residual ferronickel slag subjected to magnetic separation in the step (3), uniformly mixing, and roasting to obtain light-burned ferronickel slag;
(5) quenching: taking out the light-burned ferronickel slag obtained in the step (4), and rapidly cooling to room temperature;
(6) secondary crushing: and (5) crushing the ferronickel slag obtained in the step (5) again until the particle diameter is less than 1 mm.
(7) Grinding: and (4) adding tailing micropowder, fly ash, slag, an exciting agent and a grinding aid into the ferronickel slag powder obtained in the step (6), and then mixing and grinding to obtain the ferronickel slag-based composite active admixture.
Preferably, the roasting temperature of the ferronickel slag in the step (4) is 300-600 ℃, the heating rate is 20-50 ℃/min, and the roasting heat preservation time is 10-30 min.
In the embodiment, before the nickel-iron slag is roasted in the step (4), a roasting activation auxiliary agent accounting for 1-20% of the weight of the nickel-iron slag is added into the nickel-iron slag, so that the aims of reducing the chemical bond connection strength in the nickel-iron slag, increasing the chemical activity area in the material and improving the potential activity of the nickel-iron slag are fulfilled; the calcination activating assistant consists essentially of one or more alkali/alkaline earth metal oxides or salts, e.g.CaF2、Na2O、Na2CO3、CaO、K2CO3Chemical products or mineral products such as fluorite and feldspar, and industrial solid wastes rich in the chemical products or mineral products, such as steel slag, waste glass, stone powder and the like.
Preferably, the quenching manner in the step (5) can adopt a dry cooling manner or a wet cooling manner, and when the wet cooling manner is adopted, a secondary drying procedure needs to be added subsequently, wherein the drying temperature is 105-150 ℃.
In this example, the specific surface area of the ferrochromium-slag-based composite active admixture obtained in the step (7) is not less than 400m2And/kg, wherein the ferronickel slag-based composite active admixture obtained in the step (7) comprises, by weight, 50-80% of light-burned ferronickel slag powder, 10-40% of tailing micropowder, 20-40% of fly ash, 10-35% of slag, 0.02-1% of a grinding aid and 0-10% of an active exciting agent.
Wherein, the grinding aid used in the step (7) is composed of one or more of ionic industrial salt or high molecular chemical substances, such as limestone, anhydrous calcium chloride, triethanolamine and the like; the activator is one or more of alkali/alkaline earth metal salts, such as sodium hydroxide, sodium silicate, sodium sulfate, and desulfurized gypsum.
The specific surface area of the tailing micro powder doped in the step (7) is not less than 500m2Kg, chemical composition SiO2、Al2O3、Fe2O3Not less than 70% by weight of the total; doped fly ash SiO2Not less than 50 wt% of Al2O3The content is not less than 20 wt%, and the content of the glass phase is not less than 30 wt%; SiO slag to be doped2Not less than 30 wt%, CaO not less than 35 wt%, and Al2O3The content is not less than 10% by weight, and the content of the glass phase is not less than 85% by weight.
Compared with the prior art, the method improves the activity and the grindability of the slag by activating and roasting the nickel-iron slag at low temperature, comprehensively utilizes various industrial solid waste raw materials, and has the characteristics of simple process, wide raw material source, low energy consumption in the treatment process and the like.
Example 2
The embodiment provides a preparation method of a composite active admixture for concrete, which comprises the following steps:
(1) crushing: crushing the wet ferronickel slag by using a jaw crusher until the particle size diameter is less than 5mm to obtain fine ferronickel slag;
(2) drying: drying the fine ferronickel slag obtained in the step (1) in a drying box, and introducing air at the same time, wherein the drying temperature is 100 ℃, and the drying time is 6 hours, so as to obtain the fine dried ferronickel slag;
(3) magnetic separation: feeding the fine dried ferronickel slag obtained in the step (2) into a magnetic separator for magnetic separation, wherein the magnetic field intensity is set to be 120kA/m, so as to obtain coarse ferronickel slag, and the coarse ferronickel metal particles obtained by magnetic separation are additionally used as metal for recovery;
(4) roasting: adding a roasting activation auxiliary agent CaF accounting for 2 percent of the total weight of the fine coarse ferronickel slag into the fine coarse ferronickel slag obtained in the step (3)2Then placing the mixture into a muffle furnace for roasting at 300 ℃, at a heating rate of 10 ℃/min for 20min to obtain light-burned ferronickel slag;
(5) quenching: taking out the light-burned ferronickel slag obtained in the step (4), quenching the light-burned ferronickel slag to room temperature by water quenching, and drying the light-burned ferronickel slag to constant weight at 110 ℃;
(6) secondary crushing: putting the light-burned ferronickel cooling slag obtained in the step (6) into a mill to obtain ferronickel micro powder with the particle size of less than 1 mm;
(7) mixing and ball milling: and (3) adding tailing micropowder, fly ash and slag into the light-burned ferronickel micropowder obtained in the step (6), wherein the addition amounts are 15%, 20% and 10% (weight ratio) of the light-burned ferronickel slag powder respectively, and meanwhile, adding a grinding aid accounting for 0.02% of the total weight of the materials and sodium sulfate accounting for 1% of the total weight of the materials into the materials, and then carrying out ball milling, wherein the ball-to-material ratio is 7: ball milling time is 35min, and specific surface area is 423m2The activity index of the/kg ferronickel slag-based composite active admixture reaches 90 percent, and meets the activity requirement of standard 'ferronickel slag powder for cement and concrete' T/ASC 01-2016.
Example 3
The embodiment provides a preparation method of a composite active admixture for concrete, which comprises the following steps:
(1) crushing: crushing the wet ferronickel slag by using a jaw crusher until the particle size diameter is less than 5mm to obtain fine ferronickel slag;
(2) drying: drying the fine ferronickel slag obtained in the step (1) in a drying box, and introducing air at the same time, wherein the drying temperature is 100 ℃, and the drying time is 6 hours, so as to obtain the fine dried ferronickel slag;
(3) magnetic separation: feeding the fine dried ferronickel slag obtained in the step (2) into a magnetic separator for magnetic separation, wherein the magnetic field intensity is set to be 120kA/m, so as to obtain coarse ferronickel slag, and the coarse ferronickel metal particles obtained by magnetic separation are additionally used as metal for recovery;
(4) roasting: adding (CaO + CaF) with the total weight of 5 percent of the fine coarse ferronickel slag into the fine coarse ferronickel slag obtained in the step (3)2) Then placing the mixture into a muffle furnace for roasting at 400 ℃, at a heating rate of 10 ℃/min for 20min to obtain light-burned ferronickel slag;
(5) quenching: taking out the light-burned ferronickel slag obtained in the step (4), and naturally cooling to room temperature;
(6) secondary crushing: putting the light-burned ferronickel cooling slag obtained in the step (5) into a mill, and controlling the particle size of ferronickel micro powder to be less than 1 mm;
(7) mixing and ball milling: and (3) doping the tailing micro powder, the fly ash and the slag into the light-burned ferronickel micro powder obtained in the step (6), wherein the doping amounts are 18%, 20% and 13% (weight ratio) of the light-burned ferronickel slag powder, and meanwhile, adding a grinding aid accounting for 0.02% of the total weight of the materials and 1% of sodium sulfate into the materials, and then carrying out ball milling, wherein the ball-to-material ratio is 7: 1, ball milling for 35min to obtain a specific surface area of 412m2The activity index of the/kg ferronickel slag-based composite active admixture reaches 90 percent, and meets the activity requirement of standard 'ferronickel slag powder for cement and concrete' T/ASC 01-2016.
Example 4
The embodiment provides a preparation method of a composite active admixture for concrete, which comprises the following steps:
(1) crushing: crushing the wet ferronickel slag by using a jaw crusher until the particle size diameter is less than 5mm to obtain fine ferronickel slag;
(2) drying: drying the fine ferronickel slag obtained in the step (1) in a drying box, and introducing air at the same time, wherein the drying temperature is 100 ℃, and the drying time is 6 hours, so as to obtain the fine dried ferronickel slag;
(3) magnetic separation: feeding the fine dried ferronickel slag obtained in the step (2) into a magnetic separator for magnetic separation, wherein the magnetic field intensity is set to be 120kA/m, so as to obtain coarse ferronickel slag, and the coarse ferronickel metal particles obtained by magnetic separation are additionally used as metal for recovery;
(4) roasting: adding (Na) with the total weight of 5 percent of the fine coarse ferronickel slag into the fine coarse ferronickel slag obtained in the step (3)2CO3+CaF2) Then placing the mixture into a muffle furnace for roasting at the roasting temperature of 500 ℃, the heating rate of 25 ℃/min and the roasting time of 30min to obtain light-burned ferronickel slag;
(5) quenching: taking out the light-burned ferronickel slag obtained in the step (4), and naturally cooling to room temperature;
(6) secondary crushing: putting the light-burned ferronickel cooling slag obtained in the step (5) into a mill, and controlling the particle size of ferronickel micro powder to be less than 1 mm;
(7) mixing and ball milling: and (3) doping the tailing micro powder, the fly ash and the slag into the light-burned ferronickel micro powder obtained in the step (6), wherein the doping amounts are 30%, 25% and 40% (weight ratio) of the light-burned ferronickel slag powder, and meanwhile, adding a grinding aid accounting for 0.02% of the total weight of the materials and 1% of sodium sulfate into the materials, and then carrying out ball milling, wherein the ball-to-material ratio is 7: 1, ball milling for 35min to obtain the product with the specific surface area of 450m2The activity index of the/kg ferronickel slag-based composite active admixture reaches 98 percent, and meets the activity requirement of standard 'ferronickel slag powder for cement and concrete' T/ASC 01-2016.
Example 5
The embodiment provides a preparation method of a composite active admixture for concrete, which comprises the following steps:
(1) crushing: crushing the wet ferronickel slag by using a jaw crusher until the particle size diameter is less than 5mm to obtain fine ferronickel slag;
(2) drying: drying the fine ferronickel slag obtained in the step (1) in a drying box, and introducing air at the same time, wherein the drying temperature is 100 ℃, and the drying time is 6 hours, so as to obtain the fine dried ferronickel slag;
(3) magnetic separation: feeding the fine dried ferronickel slag obtained in the step (2) into a magnetic separator for magnetic separation, wherein the magnetic field intensity is set to be 120kA/m, so as to obtain coarse ferronickel slag, and the coarse ferronickel metal particles obtained by magnetic separation are additionally used as metal for recovery;
(4) roasting: adding 20% of the total weight of the coarse ferronickel fine slag (fluorite and steel slag micro powder) into the coarse ferronickel fine slag obtained in the step (3), and then placing the mixture into a muffle furnace for roasting, wherein the roasting temperature is 550 ℃, the heating rate is 25 ℃/min, and the roasting heat preservation time is 30min, so as to obtain light-burned nickel iron slag;
(5) quenching: taking out the light-burned ferronickel slag obtained in the step (4), and naturally cooling to room temperature;
(6) crushing: putting the light-burned ferronickel cooling slag obtained in the step (5) into a mill, and controlling the particle size of ferronickel micro powder to be less than 1 mm;
(7) mixing and ball milling: and (3) adding tailing micropowder, fly ash and slag into the light-burned ferronickel micropowder obtained in the step (6), wherein the addition amounts are 30%, 25% and 25% (weight ratio) of the light-burned ferronickel slag powder, adding a grinding aid accounting for 0.02% of the total weight of the material and sodium sulfate and sodium silicate accounting for 2% of the total weight of the material into the material, and then performing ball milling, wherein the ball-to-material ratio is 7: 1, ball milling for 35min to obtain a specific surface area of 436m2The activity index of the/kg ferronickel slag-based composite active admixture reaches 96 percent and meets the activity requirement of standard 'ferronickel slag powder for cement and concrete' T/ASC 01-2016.
The sequence of the above embodiments is only for convenience of description and does not represent the advantages and disadvantages of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A preparation method of a composite active admixture for concrete is characterized by comprising the following steps:
(1) crushing: firstly, crushing ferronickel raw slag until the particle diameter is less than 5 mm;
(2) drying: drying the ferronickel slag obtained in the step (1), wherein the drying temperature is 105-150 ℃, and the drying time is 6-12 h;
(3) magnetic separation: feeding the dried ferronickel slag obtained in the step (2) into a magnetic separator for magnetic separation, wherein the magnetic field intensity is 120-140 kA/m, and obtaining ferronickel metal particles mixed in the ferronickel slag, and returning the ferronickel metal particles as a metal ferronickel raw material to a factory for smelting;
(4) roasting: adding a roasting activating auxiliary agent into the residual ferronickel slag subjected to magnetic separation in the step (3), uniformly mixing, and roasting to obtain light-burned ferronickel slag;
(5) and (3) cooling: taking out the light-burned ferronickel slag obtained in the step (4), quenching the light-burned ferronickel slag to room temperature by water quenching, and drying the light-burned ferronickel slag to constant weight at 110 ℃;
(6) secondary crushing: crushing the ferronickel slag obtained in the step (5) again, wherein the particle size is less than 1 mm;
(7) grinding: adding tailing micropowder, fly ash, slag, an exciting agent and a grinding aid into the ferronickel slag powder obtained in the step (6), and then mixing and grinding to obtain a ferronickel slag-based composite active admixture;
wherein, in the ferronickel slag-based composite active admixture obtained in the step (7), the weight of each raw material is as follows: 50-80% of light-burned ferronickel slag powder, 10-40% of tailing micropowder, 20-40% of fly ash, 10-35% of slag, 0.02-1% of grinding aid and 0-10% of active excitant;
in the step (7), the specific surface area of the doped tailing micro powder is not less than 500m in weight2Kg, chemical composition SiO2、Al2O3And Fe2O3The total amount is not less than 70%; in the doped fly ash, SiO2Not less than 50% of Al2O3The content is not less than 20 percent, and the content of glass phase is not less than 30 percent; in the slag, SiO2Not less than 30 percent of CaO, not less than 35 percent of Al2O3Content (wt.)Not less than 10 percent, and the content of glass phase is not less than 85 percent;
and (3) before roasting the ferronickel slag in the step (4), adding a roasting activating auxiliary agent which accounts for 1-20% of the weight of the ferronickel slag into the ferronickel slag, wherein the roasting temperature of the ferronickel slag in the step (4) is 300-600 ℃, the heating rate is 20-50 ℃/min, and the roasting heat preservation time is 10-30 min.
2. The method of claim 1, wherein the calcination co-activator comprises one or more of an alkali/alkaline earth metal oxide or salt; or the roasting activation auxiliary agent is industrial solid waste rich in alkali/alkaline earth metal oxides or salts.
3. The method for preparing a composite active admixture for concrete according to claim 1, wherein said calcination activation aid comprises CaF2、Na2O、Na2CO3、CaO、K2CO3Fluorite or feldspar; or the roasting activation auxiliary agent comprises steel slag, waste glass or stone powder.
4. The method for preparing a composite active admixture for concrete according to claim 1, wherein the specific surface area of the ferrocenium nickel slag-based composite active admixture obtained in the step (7) is not less than 400m2/kg。
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| CN109678405A (en) * | 2019-01-23 | 2019-04-26 | 林瑞云 | A kind of tailing base special concrete and preparation method thereof |
| CN110372247A (en) * | 2019-08-27 | 2019-10-25 | 江苏金木土科技有限公司 | A kind of concrete admixture and preparation method thereof based on iron tailings powder |
| CN111116078B (en) * | 2020-01-14 | 2021-08-24 | 淮阴工学院 | Treatment method of ferronickel slag aggregate |
| CN111116125B (en) * | 2020-01-14 | 2021-08-17 | 淮阴工学院 | Modification treatment method of ferronickel slag aggregate |
| CN112174563A (en) * | 2020-09-10 | 2021-01-05 | 广西宝添环保材料有限公司 | Ferronickel slag active composition and preparation method thereof |
| CN112551939A (en) * | 2020-11-20 | 2021-03-26 | 福州大学 | Ferronickel slag and steel slag composite powder high-grade concrete admixture and preparation method thereof |
| CN113896494B (en) * | 2021-11-16 | 2022-09-06 | 吴联权 | Ferronickel slag building material and preparation method thereof |
| CN115490449A (en) * | 2022-10-07 | 2022-12-20 | 江苏金木土科技有限公司 | Preparation method of superfine mineral admixture |
| CN116102281B (en) * | 2022-11-18 | 2023-07-25 | 湖南科技大学 | Method for quickly preparing high-activity mixed material at low temperature by utilizing shield drying soil and high-activity mixed material prepared by method and application of high-activity mixed material |
| CN116102277B (en) * | 2022-12-30 | 2024-03-22 | 广西宝添环保材料有限公司 | Nickel-iron slag composite admixture and concrete |
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