CN115521097A - Method for preparing cement-free cementing material capable of absorbing and fixing carbon dioxide by virtue of multi-solid waste synergy and application - Google Patents

Method for preparing cement-free cementing material capable of absorbing and fixing carbon dioxide by virtue of multi-solid waste synergy and application Download PDF

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CN115521097A
CN115521097A CN202211283352.3A CN202211283352A CN115521097A CN 115521097 A CN115521097 A CN 115521097A CN 202211283352 A CN202211283352 A CN 202211283352A CN 115521097 A CN115521097 A CN 115521097A
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tailings
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coal gangue
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CN115521097B (en
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舒新前
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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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • 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
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/027—Lightweight materials
    • 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 belongs to the technical field of solid waste treatment and resource utilization, and particularly relates to a method for preparing solid absorption CO through multi-solid waste synergistic treatment 2 The method and application of the cement-free gelling material. The cement-free cementing material is prepared by cooperatively treating alkaline industrial waste residues, corresponding tailings and low-grade waste ores with coal-based solid wastes such as coal gangue, coal ash, gasified ash residues, desulfurized gypsum and the like, and comprises the following components in parts by mass: 25 to 35 portions of aggregate, 30 to 45 portions of base material, 15 to 25 portions of admixture, 10 to 15 portions of stabilizer and 15 to 25 portions of activity promoter, and can be used for CO 2 In the presence of CO, in the presence of 2 The efficient resource utilization of the bulk industrial solid waste is promoted while the effective emission reduction is realized. The cement-free cementing material prepared from the raw materials in parts by mass can effectively carry out CO (carbon monoxide) reaction 2 Absorption, solidification and mineralization reaction of (2) to promote CO 2 And (4) emission reduction.

Description

Method for preparing cement-free gelling material capable of absorbing and fixing carbon dioxide by virtue of multi-solid waste synergy and application
Technical Field
The invention belongs to the technical field of solid waste treatment and resource utilization, and particularly relates to solid absorption CO prepared by multi-solid waste synergy 2 The method and application of the cement-free gelling material.
Background
Traditionally, CO separation and recovery 2 The techniques of (3) include adsorption, absorption, and membrane separation. The membrane separation method is to use special membrane material to separate CO 2 Treating the gas; adsorption method for CO by using porous adsorption material 2 Such as CO by using zeolite 13X, metal Organic Framework (MOF), activated carbon, etc 2 Adsorption of (2); the absorption method adopts absorption materials such as calcium-based absorbent to carry out CO 2 Absorption of, e.g. CO at temperatures of 50-100 ℃ by means of supported metal carbonates 2 And regenerating at 120-200 deg.c. In general, regardless of the treatment method, CO is present 2 The trapping and processing cost is high, and the like, and the large-scale popularization and application are difficult.
For this purpose, the solid waste is used to produce CO 2 Adsorption/absorption materials for CO 2 The treatment becomes a hot point of research, and can reduce CO 2 The effective resource utilization of the solid waste is realized while the treatment cost is reduced. Currently, the solid waste is utilized to prepare CO 2 The adsorbing/absorbing material is selected from solid waste material of alkali or alkaline earth metal mineral, such as wollastonite (CaSiO) containing calcium and other alkaline earth metals 3 ) And serpentine (Mg) containing alkaline earth metal such as magnesium 3 Si 2 O 5 (OH) 4 ) Forsterite (Mg) 2 SiO 4 ) Or talc (Mg) 2 Si 4 O 10 (OH) 2 ) Etc., by absorbing the waste to form stable carbonate, to implement CO 2 Absorption, solidification and mineralization of. However, CO produced by using solid waste is currently used 2 Adsorption/absorption materials, which have a slower overall mineralization, CO 2 The absorption curing rate of (2) is also relatively low, and direct industrial application is difficult.
Disclosure of Invention
Therefore, the invention aims to provide a method for preparing solid absorption CO by CO-processing multiple solid wastes 2 The method and application of the cement-free gelling material. The cement-free gelling material provided by the invention can efficiently absorb CO 2 And the solidification and mineralization reaction are carried out, so that CO is effectively carried out while the high-efficiency resource utilization of bulk solid waste is realized 2 Low cost and emission reduction.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a method for absorbing and fixing CO 2 The cement-free gelling material comprises the following components in parts by mass:
25-35 parts of aggregate, 30-45 parts of base material, 15-25 parts of admixture, 10-15 parts of stabilizer and 15-25 parts of activity promoter;
the aggregate comprises one or more of first coal gangue, first gasified ash, first alkaline industrial waste residue, first tailings, first low-grade ore and lightweight aggregate; the lightweight aggregate is prepared by mixing first tailings and/or first low-grade ores with first coal gangue and then calcining; the particle size of the aggregate is 0.15-3 mm;
the base material comprises one or more of fly ash, second gasified ash and second alkaline industrial waste residue; the grain size of the base material is less than 0.15mm;
the admixture comprises one or more of second coal gangue, second alkaline industrial waste residue, second tailings and second low-grade ore; the grain size of the admixture is less than 0.15mm;
the stabilizer comprises desulfurized gypsum and second alkaline industrial waste residue;
the active promoter is prepared by blending second tailings and/or second low-grade ores and second coal gangue and then calcining the blended second tailings and/or second low-grade ores;
the first coal gangue and the second coal gangue independently comprise one or more of high-calcium coal gangue, high-alkali coal gangue and high-iron coal gangue; the mass content of CaO in the high-calcium coal gangue is more than or equal to 15 percent, and Na in the high-alkali coal gangue 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and Fe in the high-iron coal gangue 2 O 3 The mass content of the compound is more than or equal to 8 percent;
the first and second gasification ashes independently comprise one or more of a high calcium gasification ash, a high alkali gasification ash, and a high iron gasification ash; the mass content of CaO in the high-calcium gasified ash is more than or equal to 15%, and the mass content of Na in the high-alkali gasified ash is more than or equal to 15% 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and Fe in the high-iron gasified ash 2 O 3 The mass content of the compound is more than or equal to 8 percent;
the first and second tailings are independently tailings containing alkali or alkaline earth metals; the first low-grade ore and the second low-grade ore are low-grade ores containing alkali metals or alkaline earth metals independently, the mass content of the alkali metals in the tailings containing the alkali metals and the low-grade ores is not less than 10%, and the mass content of the alkaline earth metals in the tailings containing the alkaline earth metals and the low-grade ores is not less than 25%;
the fly ash comprises one or more of high-calcium fly ash, high-alkali fly ash and high-iron fly ash; the mass content of CaO in the high-calcium fly ash is more than or equal to 15 percent, and Na in the high-alkali fly ash 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and the high-iron fly ash contains Fe 2 O 3 The mass content of the compound is more than or equal to 8 percent.
Preferably, the aggregate comprises the following components in percentage by mass:
10-20% of first coal gangue, 10-20% of first gasified ash, 20-30% of first alkaline industrial waste residue, 10-20% of first tailings and/or first low-grade ore and 30-35% of lightweight aggregate.
Preferably, the base material comprises the following components in percentage by mass:
30-45% of fly ash, 15-25% of second gasified ash and 30-45% of second alkaline industrial waste residue.
Preferably, the admixture comprises the following components in percentage by mass:
30-40% of second coal gangue, 35-50% of second alkaline industrial waste residue and 20-30% of second tailings and/or second low-grade ore.
Preferably, the stabilizer comprises the following components in percentage by mass: 60-75% of desulfurized gypsum and 25-40% of second alkaline industrial waste residue.
Preferably, the second tailings and/or the second low-grade ore are blended with second coal gangue to obtain a blend, and the blend is calcined to obtain the activity promoter, wherein the blend is prepared from the following components in percentage by mass: second tailings and/or second low-grade ores: the second coal gangue = 35-55%: 45 to 65 percent; the grain size of the mixed material is less than 0.15mm.
Preferably, the first alkaline industrial waste residue and the second alkaline industrial waste residue independently comprise one or more of magnesium residue, carbide residue, red mud, lime residue, steel slag, metallurgical dedusting ash and alkali metal waste residue; the mass content of MgO in the magnesium slag is more than or equal to 5.5 percent, the mass content of CaO in the carbide slag is more than or equal to 30 percent, the pH value of the red mud is more than or equal to 9.5, the mass content of CaO in the lime slag is more than or equal to 55 percent,the mass content of CaO in the steel slag is more than or equal to 30 percent, the mass content of CaO in the metallurgical dedusting ash is more than or equal to 25 percent, and Na in the alkali metal waste slag 2 The mass content of O is more than or equal to 30 percent or K 2 The mass content of O is more than or equal to 10 percent.
Preferably, the first tailings and the second tailings independently comprise one or more of limestone tailings, apatite tailings, wollastonite tailings, magnesite tailings, dolomite tailings, asbestos tailings, olivine tailings, talc tailings, montmorillonite tailings, mirabilite tailings and sylvite tailings; the mass content of CaO in the limestone tailings, the apatite tailings and the wollastonite tailings is not less than 35% independently; the MgO content in the magnesite tailings, the dolomite tailings, the asbestos tailings, the olivine tailings, the talc tailings and the montmorillonite tailings is independently more than or equal to 25 percent; na in the mirabilite tailings 2 The mass content of O is more than or equal to 30 percent; k in the potassium salt tailings 2 The mass content of O is more than or equal to 10 percent;
the first low-grade ore and the second low-grade tailings independently comprise one or more of limestone low-grade ore, apatite low-grade ore, wollastonite low-grade ore, magnesite low-grade ore, dolomite low-grade ore, asbestos ore low-grade ore, olivine low-grade ore, talc low-grade ore, montmorillonite low-grade ore, mirabilite low-grade ore and sylvite low-grade ore; the CaO content in the limestone low-grade ore, the apatite low-grade ore and the wollastonite low-grade ore is not less than 35% by mass independently; the MgO content in the magnesite low-grade ore, the dolomite low-grade ore, the asbestos ore low-grade ore, the olivine low-grade ore, the talc low-grade ore and the montmorillonite low-grade ore is independently more than or equal to 25 percent; na in the mirabilite low-grade ore 2 The mass content of O is more than or equal to 30 percent; k in the low-grade potassium salt ore 2 The mass content of O is more than or equal to 10 percent.
Preferably, the preparation method of the lightweight aggregate comprises the following steps:
mixing the first tailings and/or the first low-grade ore with the first coal gangue, and calcining under the condition of supplying excess air to obtain the lightweight aggregate; the mass ratio of the first tailings and/or the first low-grade ores to the first coal gangue is (30-50) to (50-70); the excess air coefficient alpha value during calcination is less than or equal to 1.25; the calcining temperature is less than or equal to 980 ℃, and the constant temperature time of calcining is less than or equal to 1h.
The invention provides the application of the cement-free gelling material in the technical scheme in CO 2 Absorption and curing.
The invention provides a method for absorbing and fixing CO 2 The cement-free gelling material comprises the following components in parts by mass: 25-35 parts of aggregate, 30-45 parts of base material, 15-25 parts of admixture, 10-15 parts of stabilizer and 15-25 parts of activity promoter; the aggregate comprises one or more of first coal gangue, first gasified ash, first alkaline industrial waste residue, first tailings, first low-grade ore and lightweight aggregate; the lightweight aggregate is prepared by blending and calcining first tailings and/or first low-grade ores and first coal gangue; the particle size of the aggregate is 0.15-3 mm; the base material comprises one or more of fly ash, second gasification ash and second alkaline industrial waste residue; the grain size of the base material is less than 0.15mm; the admixture comprises one or more of second coal gangue, second alkaline industrial waste residue, second tailings and second low-grade ore; the grain size of the admixture is less than 0.15mm; the stabilizer comprises desulfurized gypsum and second alkaline industrial waste residue; the active promoter is prepared by blending second tailings and/or second low-grade ores and second coal gangue and then calcining the blended second tailings and/or second low-grade ores. The first coal gangue and the second coal gangue independently comprise one or more of high-calcium coal gangue, high-alkali coal gangue and high-iron coal gangue; the mass content of CaO in the high-calcium coal gangue is more than or equal to 15 percent, and Na in the high-alkali coal gangue 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and Fe in the high-iron coal gangue 2 O 3 The mass content of the compound is more than or equal to 8 percent; the first and second gasification ashes independently comprise one or more of a high calcium gasification ash, a high alkali gasification ash, and a high iron gasification ash; the mass content of CaO in the high-calcium gasified ash is more than or equal to 15%, and Na in the high-alkali gasified ash is 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and Fe in the high-iron gasified ash 2 O 3 The mass content of the compound is more than or equal to 8 percent; the first tailings and the second tailings are independentThe ground is tailings containing alkali metal or alkaline earth metal; the first low-grade ore and the second low-grade ore are low-grade ores containing alkali metals or alkaline earth metals independently, the mass content of the alkali metals in the low-grade ores containing the alkali metals is not less than 10%, and the mass content of the alkaline earth metals in the low-grade ores containing the alkaline earth metals is not less than 25%; the fly ash comprises one or more of high-calcium fly ash, high-alkali fly ash and high-iron fly ash; the mass content of CaO in the high-calcium fly ash is more than or equal to 15 percent, and Na in the high-alkali fly ash 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and the high-iron fly ash contains Fe 2 O 3 The mass content of (A) is more than or equal to 8 percent. The invention prepares the solid absorption CO by using four coal-based bulk solid wastes of coal gangue, fly ash, gasified ash and desulfurized gypsum which are rich in coal mine area and cooperatively processing alkaline industrial waste residues, corresponding tailings and low-grade ores simultaneously 2 The cement-free cementing material of (1) and the simultaneous CO 2 Absorption and curing. By implementing the method, not only can the efficient resource utilization of bulk industrial solid wastes be realized, but also CO can be simultaneously carried out 2 The effective absorption and solidification of the composite material can promote the synergistic development of the solid waste resource utilization and the carbon reduction action. In particular, many mining areas are coal industry gathering areas integrating coal production, coal-fired power generation and coal chemical industry, and CO 2 The emission intensity is higher, the emission amount is larger, and the carbon reduction action is very urgent. In addition, in the coal mine area, due to mine mining, a plurality of mining subsidence areas and cracks are generated, and a plurality of mining disturbance spaces are left, and the multi-solid waste is synergistically treated to be solid-absorbed CO 2 The cement-free cementing material is filled in the goaf to absorb and solidify CO 2 Realization of CO 2 Mineralization and sealing and secondary ore forming. Therefore, the invention efficiently utilizes the bulk solid waste as resources and CO 2 The effective emission reduction and the secondary ore formation and goaf solidification filling support are effectively combined, and the method is used for green mine construction and CO 2 The emission reduction and sink increase of the method play an important promoting role. The invention adopts the raw materials to prepare the cement-free gelling material within the mass content range, and can effectively carry out CO 2 The absorption, solidification and mineralization reaction ofThe force promotes the secondary mineralization.
Detailed Description
The invention provides a method for absorbing and fixing CO 2 The cement-free gelling material comprises the following components in parts by mass:
25-35 parts of aggregate, 30-45 parts of base material, 15-25 parts of admixture, 10-15 parts of stabilizer and 15-25 parts of activity promoter;
the aggregate comprises one or more of first coal gangue, first gasified ash, first alkaline industrial waste residue, first tailings, first low-grade ore and lightweight aggregate; the lightweight aggregate is prepared by mixing and calcining first tailings and/or first low-grade ores and first coal gangue; the particle size of the aggregate is 0.15-3 mm;
the base material comprises one or more of fly ash, second gasified ash and second alkaline industrial waste residue, and the particle size of the base material is less than 0.15mm;
the admixture comprises one or more of second coal gangue, second alkaline industrial waste residue, second tailings and second low-grade ore, and the particle size of the admixture is less than 0.15mm;
the stabilizer comprises desulfurized gypsum and second alkaline industrial waste residue;
the active promoter is prepared by blending and calcining second tailings and/or second low-grade ores and second coal gangue;
the first coal gangue and the second coal gangue independently comprise one or more of high-calcium coal gangue, high-alkali coal gangue and high-iron coal gangue; the mass content of CaO in the high-calcium coal gangue is more than or equal to 15 percent, and Na in the high-alkali coal gangue 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and Fe in the high-iron coal gangue 2 O 3 The mass content of the compound is more than or equal to 8 percent;
the first and second gasification ashes independently comprise one or more of a high calcium gasification ash, a high alkali gasification ash, and a high iron gasification ash; the mass content of CaO in the high-calcium gasified ash is more than or equal to 15%, and Na in the high-alkali gasified ash is 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and Fe in the high-iron gasified ash 2 O 3 The mass content of the compound is more than or equal to 8 percent;
the first and second tailings are independently tailings containing alkali or alkaline earth metals; the first low-grade ore and the second low-grade ore are low-grade ores containing alkali metals or alkaline earth metals independently, the mass content of the alkali metals in the low-grade ores containing the alkali metals is not less than 10%, and the mass content of the alkaline earth metals in the low-grade ores containing the alkaline earth metals is not less than 25%;
the fly ash comprises one or more of high-calcium fly ash, high-alkali fly ash and high-iron fly ash; the mass content of CaO in the high-calcium fly ash is more than or equal to 15 percent, and Na in the high-alkali fly ash 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and the high-iron fly ash contains Fe 2 O 3 The mass content of the compound is more than or equal to 8 percent.
In the present invention, all the preparation starting materials/components are commercially available products well known to those skilled in the art unless otherwise specified.
The cement-free cementing material provided by the invention comprises 25-35 parts by mass of aggregate, preferably 25.5-34.5 parts by mass, and more preferably 26-34 parts by mass.
In the invention, the aggregate comprises one or more of first coal gangue, first gasified ash, first alkaline industrial waste residue, first tailings, first low-grade ore and lightweight aggregate; more preferably comprises first coal gangue, first gasified ash, first alkaline industrial waste residue, first tailings and/or first low-grade ore and lightweight aggregate.
In the invention, the aggregate comprises the following components in percentage by mass:
10-20% of first coal gangue, 10-20% of first gasified ash, 20-30% of first alkaline industrial waste residue, 10-20% of first tailings and/or first low-grade ore and 30-35% of lightweight aggregate.
The aggregate preferably comprises 10-20% of first coal gangue by mass percentage, and more preferably 11-19%.
In the invention, the first coal gangue comprises one or more of high-calcium coal gangue, high-alkali coal gangue and high-iron coal gangueA plurality of types; the mass content of CaO in the high-calcium coal gangue is more than or equal to 15 percent, preferably more than or equal to 15.5 percent, and Na in the high-alkali coal gangue 2 O and K 2 The total mass content of O is more than or equal to 5 percent, preferably more than or equal to 5.5 percent, and Fe in the high-iron coal gangue 2 O 3 The mass content of (B) is not less than 8%, preferably not less than 8.5%.
In the invention, the grain diameter of the first coal gangue is 0.15-3 mm, preferably 0.16-3 mm.
In the invention, the first coal gangue comprises directly crushed coal gangue or multi-stage crushed coal gangue.
In the present invention, the preparation method of the directly pulverized coal gangue preferably comprises the following steps:
ash content (Ad) is higher than 85%, and solid CO is absorbed 2 The content of active components is higher (CaO is more than or equal to 30 percent, fe 2 O 3 ≥18％、Na 2 O+K 2 O is more than or equal to 10.5 percent) and then the coal gangue raw material is directly crushed and sieved to obtain the directly crushed coal gangue with the particle size of 3-0.15 mm, and the material with the particle size of-0.15 mm is used as the second coal gangue. The present invention has no particular requirements for the specific implementation of the comminution and screening process.
In the invention, the ash content (Ad) is lower than 85 percent, and the solid CO is absorbed 2 The coal gangue raw material with general active component content is subjected to multistage crushing, and the preparation method of the multistage crushed coal gangue preferably comprises the following steps: 1, screening the coal gangue raw material to obtain 1 st screened material;
screening the 1 st screen blanking material by the 2 nd screen to obtain a2 nd screen oversize material;
sequentially carrying out grade 1 crushing and grade 3 screening on the 2 nd oversize material to obtain a 3 rd undersize material;
screening the 3 rd screened material by the 4 th screen to obtain a 4 th screened material;
performing 2 nd-level crushing and 5 th screening on the 4 th oversize material to obtain a 5 th undersize material;
screening the 5 th screen material by a 6 th screen to obtain a 6 th screen material;
performing 3 rd-level crushing and 7 th screening on the 6 th oversize material to obtain 7 th screening material;
8 screening the 7 th screen material to obtain 8 th screen material;
performing 4-stage crushing and 9-stage screening on the 8 th oversize material to obtain a 9 th undersize material;
and (3) carrying out 5 th grade crushing on the 9 th screen blanking material to below 3mm, and carrying out 10 th screening to obtain the multistage crushed coal gangue, wherein the screen material with the grain size of 3-0.15 mm is used as the first coal gangue.
In the invention, after the coal gangue is crushed, a plurality of fresh surfaces such as cracks, fractures and the like are formed, and the reaction activity is higher.
In the present invention, the aperture of the 1 st sieve is preferably 100mm or 50mm depending on the particle size of the raw material. The 1 st screening preferably also obtains a1 st oversize material, and the 1 st oversize material is directly used as a raw material of sandstone aggregate.
In the invention, the 2 nd screening is preferably carried out by adopting a high-frequency vibrating screen or a fly-over screen with a screen hole of 1 mm. The 2 nd sieve preferably also obtains a2 nd sieve material, and the 2 nd sieve material is used as coal.
In the present invention, the aperture of the 3 rd sieving screen is preferably 50mm or 30mm. And preferably, the third screening also obtains a 3 rd oversize material, and the 3 rd oversize material is directly used as a raw material of the sandstone aggregate.
In the present invention, the 4 th screening is preferably performed by using a high frequency vibration screen or a relaxation screen with a screen hole of 1 mm. The 4 th screen preferably also yields a 4 th screen cut, the 4 th screen cut being coal.
In the present invention, the aperture of the 5 th sieving screen is preferably 30mm or 15mm. The 5 th screening preferably also obtains a 5 th oversize material, and the 5 th oversize material is directly used as a raw material of the sandstone aggregate.
In the invention, the 6 th screening is preferably carried out by using a high-frequency vibrating screen or a relaxation screen with the screen hole of 1 mm. The 6 th screen preferably also yields a 6 th screen cut, the 6 th screen cut being coal.
In the present invention, the aperture of the 7 th sieving screen is preferably 15mm or 10mm. The 7 th screen preferably also yields a 7 th oversize, which 7 th oversize is directly used as crushed stone.
In the invention, the 8 th screening is preferably carried out by using a high-frequency vibrating screen or a relaxation screen with the screen hole of 1 mm. The 8 th screen preferably also yields an 8 th screen cut, the 8 th screen cut being coal.
In the present invention, the 9 th screen mesh preferably has a pore size of 5mm. The 9 th screen preferably also produces a 9 th oversize and undersize, the 9 th oversize being used directly as crushed stone.
In the present invention, the 10 th screening mesh is preferably screened by using a 0.15mm high frequency vibration screen or a fly-over screen. And preferably, a 10 th screen material is obtained by the 10 th screening, and the 10 th screen material is used as second coal gangue and has the grain size of less than 0.15mm.
The aggregate preferably comprises 10 to 20 mass percent of the first gasified ash, and more preferably 10.5 to 20 mass percent of the first gasified ash.
In the invention, the particle size of the first gasified ash is 0.15-3 mm.
In the present invention, the first gasified slag includes one or more of high calcium gasified slag, high alkali gasified slag, and high iron gasified slag; the mass content of CaO in the high-calcium gasified ash is more than or equal to 15 percent, preferably more than or equal to 15.5 percent; na in the high-alkali gasified ash 2 O and K 2 The total mass content of O is more than or equal to 5 percent, preferably more than or equal to 5.5 percent; fe in the high-iron gasified slag 2 O 3 The mass content of (B) is not less than 8%, preferably not less than 8.5%.
The aggregate preferably comprises 20 to 30 percent of the first alkaline industrial waste residue by mass percentage, and more preferably 20.5 to 30 percent.
In the invention, the particle size of the first alkaline industrial waste residue is 0.15-3 mm.
In the invention, the first alkaline industrial waste residue preferably comprises one or more of magnesium slag, carbide slag, red mud, lime slag, steel slag, metallurgical dedusting ash and alkali metal waste residue; the mass content of MgO in the magnesium slag is preferably not less than 5.5 percent, and more preferably not less than 6 percent; the preferable mass content of CaO in the carbide slag is more than or equal to 30 percent, and more preferably more than or equal to 30.5 percent; the pH value of the red mudPreferably 9.5 or more, more preferably 10 or more; the mass content of CaO in the lime mud is preferably not less than 55%, and more preferably not less than 55.5%; the mass content of CaO in the steel slag is preferably more than or equal to 30 percent, and more preferably more than or equal to 30.5 percent; the mass content of CaO in the metallurgical dedusting ash is preferably not less than 25%, and more preferably not less than 25.5%; na in the alkali metal waste residue 2 The mass content of O is preferably not less than 30%, more preferably not less than 30.5% or K 2 The content of O is preferably not less than 10% by mass, more preferably not less than 10.5% by mass.
The aggregate preferably comprises 10-20% of the first tailings and/or the first low-grade ore by mass percentage, and more preferably 10.5-20%.
In the present invention, the aggregate preferably comprises 10 to 20% of the first tailings or the first low-grade ore, more preferably 10.5 to 20%.
In the invention, the grain diameter of the first tailings is 0.15-3 mm.
In the present invention, the first low-grade ore has a particle size of 0.15 to 3mm.
In the present invention, the first tailings preferably include one or more of limestone tailings, apatite tailings, wollastonite tailings, magnesite tailings, dolomite tailings, asbestos tailings, olivine tailings, talc tailings, montmorillonite tailings, mirabilite tailings, and sylvite tailings; the mass content of CaO in the limestone tailings is preferably more than or equal to 35 percent; the mass content of CaO in the apatite tailings is preferably more than or equal to 35 percent; the mass content of CaO in the wollastonite tailings is preferably more than or equal to 35 percent; the mass content of MgO in the magnesite tailings is preferably more than or equal to 25 percent; the mass content of MgO in the dolomite tailings is preferably more than or equal to 25 percent; the mass content of MgO in the asbestos ore tailings is preferably more than or equal to 25 percent; the content of MgO in the olivine tailings is preferably more than or equal to 25 percent; the mass content of MgO in the talc tailings is preferably more than or equal to 25 percent; the content of MgO in the montmorillonite tailings is preferably more than or equal to 25 percent; na in the mirabilite tailings 2 The mass content of O is preferably more than or equal to 30 percent; k in the potassium salt tailings 2 The mass content of O is preferably not less than 10%.
In the present invention, the first low-grade ore preferably includes limestone low-grade ore, apatite low-grade ore, wollastonite low-grade ore, magnesite low-grade oreOne or more of ore, dolomite low-grade ore, asbestos ore low-grade ore, olivine low-grade ore, talc low-grade ore, montmorillonite low-grade ore, mirabilite low-grade ore and sylvite low-grade ore; the preferable mass content of CaO in the limestone low-grade ore is more than or equal to 35 percent; the preferable mass content of CaO in the apatite low-grade ore is more than or equal to 35 percent; the preferable mass content of CaO in the wollastonite low-grade ore is more than or equal to 35 percent; the preferred mass content of MgO in the low-grade magnesite is more than or equal to 25%; the preferable mass content of MgO in the dolomite low-grade ore is more than or equal to 25 percent; the mass content of MgO in the asbestos ore low-grade ore is preferably more than or equal to 25 percent; the preferred mass content of MgO in the olivine low-grade ore is more than or equal to 25 percent; the preferable mass content of MgO in the talc low-grade ore is more than or equal to 25 percent; the mass content of MgO in the montmorillonite low-grade ore is preferably more than or equal to 25 percent; na in the mirabilite low-grade ore 2 The mass content of O is preferably more than or equal to 30 percent; k in the low-grade potassium salt ore 2 The mass content of O is preferably not less than 10%.
In the present invention, the first tailings (low-grade ores) include direct crushing tailings (low-grade ores) or multistage crushing tailings (low-grade ores).
In the invention, when the tailings (low-grade ores) absorb and fix CO 2 The active components have higher content (CaO is more than or equal to 55 percent, mgO is more than or equal to 35 percent, na is added 2 O+K 2 When the O is more than or equal to 35 percent), the preparation method of the directly crushed tailings (low-grade ores) is preferably the same as the preparation method of the directly crushed coal gangue, and the details are not repeated.
In the invention, when the tailings (low-grade ores) absorb and fix CO 2 The active component content of (a) is generally subjected to multistage crushing, and the preparation method of multistage crushed tailings (low-grade ores) preferably comprises the following steps:
screening the tailing (low-grade ore) raw material by 11 th to obtain 11 th oversize material and oversize material, wherein the oversize material is directly used as a raw material of sandstone aggregate;
carrying out 6 th-stage crushing and 12 th screening on the 11 th screened material to obtain a12 th oversize material and a12 th screened material, wherein the oversize material is directly used as a raw material of gravel aggregate;
carrying out 7 th-stage crushing and 13 th screening on the 12 th screened material to obtain a 13 th oversize material and a 13 th screened material, wherein the oversize material is directly used as a raw material of gravel aggregate;
carrying out 8 th-level crushing and 14 th screening on the 13 th screened material to obtain 14 th oversize material and screened material, wherein the oversize material is directly used as a raw material of gravel aggregate;
carrying out 9 th-level crushing and 15 th screening on the 14 th screened material to obtain a 15 th oversize material and a 15 th screened material, wherein the oversize material is directly used as a raw material of gravel aggregate; and (3) performing 10 th-stage crushing and 16 th-stage screening on the 15 th screened material to obtain 3-0.15 mm of first tailings (low-grade ores), namely the multistage crushed tailings (low-grade ores) and-0.15 mm of second tailings (low-grade ores).
In the invention, after the tailings (low-grade ores) are crushed, a plurality of fresh surfaces such as cracks and fractures are formed, and the reactivity is higher.
In the present invention, the aperture of the 11 th sieving screen is preferably 100mm or 50mm in terms of the particle size of the raw material, the aperture of the 12 th sieving screen is preferably 50mm or 30mm, the aperture of the 13 th sieving screen is preferably 30mm or 15mm, the aperture of the 14 th sieving screen is preferably 15mm or 10mm, the aperture of the 15 th sieving screen is preferably 5mm, and the aperture of the 16 th sieving screen is 0.15mm.
The aggregate preferably comprises 30 to 35 mass percent of lightweight aggregate, and more preferably 30.5 to 35 mass percent of lightweight aggregate.
In the invention, the lightweight aggregate is prepared by blending and calcining first coal gangue and first tailings (low-grade ores).
In the invention, the particle size of the lightweight aggregate is 0.15-3 mm.
In the present invention, the preparation method of the lightweight aggregate preferably comprises the steps of:
mixing the first tailings and/or the first low-grade ore with the first coal gangue, and calcining under the condition of supplying excess air to obtain the lightweight aggregate; the mass ratio of the first tailings and/or the first low-grade ores to the first coal gangue is (30-50) to (50-70); the excess air coefficient alpha value during calcination is less than or equal to 1.25; the calcining temperature is less than or equal to 980 ℃, and the constant temperature time of calcining is less than or equal to 1h.
In the invention, when the first coal gangue is directly crushed coal gangue, the mass ratio of the first tailings and/or the first low-grade ore to the first coal gangue is (30-45) to (55-70).
In the invention, when the first coal gangue is multi-stage crushed coal gangue, the mass ratio of the first tailings and/or the first low-grade ore to the first coal gangue is (35-50) to (50-65).
In the invention, the value of the excess air coefficient alpha during calcination is preferably not more than 1.2, the calcination temperature is preferably not more than 975 ℃, and the constant temperature time of calcination is preferably not more than 55min.
The invention has no special requirements on the preparation method of the aggregate, and the first coal gangue, the first gasified ash, the first alkaline industrial waste residue, the first tailings and/or the first low-grade ore and the lightweight aggregate are mixed and then uniformly mixed.
Based on the mass portion of the aggregate, the cement-free cementing material provided by the invention comprises 30-45 parts of base material, preferably 30.5-45 parts, and more preferably 31-44 parts.
In the present invention, the binder includes one or more of fly ash, second gasified ash, and second alkaline industrial residue.
In the invention, the base material comprises the following components in percentage by mass:
30-45% of fly ash, 15-25% of second gasified ash and 30-45% of second alkaline industrial waste residue.
The base material preferably comprises 30-45% of fly ash by mass percentage, and more preferably 31-44%.
In the invention, the fly ash comprises one or more of high-calcium fly ash, high-alkali fly ash and high-iron fly ash; the mass content of CaO in the high-calcium fly ash is more than or equal to 15 percent, preferably more than or equal to 15.5 percent, and the mass content of Na in the high-alkali fly ash is more than or equal to 15 percent 2 O and K 2 The total mass content of O is more than or equal to 5 percent, preferably more than or equal to 5.5 percent, theFe in high iron fly ash 2 O 3 The mass content of (b) is not less than 8%, preferably not less than 8.5%.
The base material preferably comprises 15 to 25 percent of second gasification ash, more preferably 15.5 to 25 percent.
In the invention, the grain size of the second gasification ash is less than 0.15mm.
In the present invention, the second gasification ash includes one or more of a high calcium gasification ash, a high alkali gasification ash, and a high iron gasification ash; the mass content of CaO in the high-calcium gasified ash is more than or equal to 15 percent, preferably more than or equal to 15.5 percent; na in the high-alkali gasification ash 2 O and K 2 The total mass content of O is more than or equal to 5 percent, preferably more than or equal to 5.5 percent; fe in the high-iron gasification ash 2 O 3 The mass content of (B) is not less than 8%, preferably not less than 8.5%.
The base material preferably comprises 30-45% of the second alkaline industrial waste residue by mass percentage, and more preferably 30.5-45%.
In the invention, the grain size of the second alkaline industrial waste residue is less than 0.15mm.
In the invention, the second alkaline industrial waste residue preferably comprises one or more of magnesium slag, carbide slag, red mud, lime slag, steel slag, metallurgical dedusting ash and alkali metal waste residue; the mass content of MgO in the magnesium slag is preferably not less than 5.5 percent, and more preferably not less than 6 percent; the preferable mass content of CaO in the carbide slag is more than or equal to 30 percent, and more preferably more than or equal to 30.5 percent; the pH value of the red mud is preferably more than or equal to 9.5, and more preferably more than or equal to 10; the mass content of CaO in the lime mud is preferably not less than 55%, and more preferably not less than 55.5%; the mass content of CaO in the steel slag is preferably more than or equal to 30 percent, and more preferably more than or equal to 30.5 percent; the mass content of CaO in the metallurgical dedusting ash is preferably not less than 25%, and more preferably not less than 25.5%; na in the alkali metal waste residue 2 The content of O is preferably not less than 30% by mass, more preferably not less than 35% by mass or K 2 The mass content of O is preferably not less than 10%, more preferably not less than 10.5%.
In the present invention, the preparation method of the base material preferably comprises the steps of:
and blending the fly ash, the second gasified ash and the second alkaline industrial waste residue and then grinding to obtain the base material.
In the present invention, the grinding preferably includes the following three modes:
the first method is as follows: blending the fly ash, the second gasified ash and the second alkaline industrial waste residue, and then performing dry grinding, wherein the dry grinding time is preferably 1-8 h; the particle size of the base material is preferably less than or equal to 0.045mm.
The second method comprises the following steps: mixing the fly ash, the second gasified ash and the second alkaline industrial waste residue, adding water, and mixing to obtain slurry, and performing wet grinding on the obtained slurry, wherein the water is 30-65% of the mass of the slurry; the wet grinding time is preferably 0.5-6 h; the particle size of the base material is preferably less than or equal to 0.045mm.
The third method comprises the following steps: mixing the fly ash, the second gasified ash and the second alkaline industrial waste residue, adding a grinding aid to obtain a mixture, and performing dry grinding or water-adding wet grinding on the mixture; the adding amount of the grinding aid is 1.5-6.5% of the mass content of the mixture; the grinding aid is preferably a second low-grade ore, more preferably one or more of wollastonite low-grade ore, apatite low-grade ore, talc low-grade ore and montmorillonite low-grade ore, and when the grinding aid is more preferably more than two components, the more than two components are preferably blended in equal proportion. In the invention, the time of the dry grinding after the grinding aid is added is preferably 0.5-5.5 h. The time of the wet grinding after the grinding aid is added is preferably 0.5-4.5 h, and the particle size of the base material is preferably less than or equal to 0.045mm.
Based on the mass portion of the aggregate, the cement-free cementing material provided by the invention comprises 15-25 parts of admixture, preferably 16-24.5 parts, and more preferably 16-24 parts.
In the invention, the admixture comprises the following components in percentage by mass:
35-50% of second coal gangue, 30-40% of second alkaline industrial waste residue and 20-30% of second tailings and/or second low-grade ore.
The admixture preferably comprises 35-50% of second coal gangue by mass percentage, and more preferably 36-48%.
In the invention, the second coal gangue comprises one or more of high-calcium coal gangue, high-alkali coal gangue and high-iron coal gangue; the mass content of CaO in the high-calcium coal gangue is more than or equal to 15 percent, preferably more than or equal to 15.5 percent, and Na in the high-alkali coal gangue is more than or equal to 15 percent 2 O and K 2 The total mass content of O is more than or equal to 5 percent, preferably more than or equal to 5.5 percent, and Fe in the high-iron coal gangue 2 O 3 The mass content of (B) is not less than 8%, preferably not less than 8.5%.
In the invention, the grain diameter of the second coal gangue is less than 0.15mm, and is preferably less than 0.12mm.
In the invention, the second coal gangue comprises directly crushed coal gangue or multi-stage crushed coal gangue.
In the present invention, the preparation method of the directly pulverized coal gangue or the multistage pulverized coal gangue is preferably the same as the preparation method of the directly pulverized coal gangue or the multistage pulverized coal gangue described above, and is not described herein again.
The admixture preferably comprises 30-40% of the second alkaline industrial waste residue by mass percentage, and more preferably 30.5-40%.
In the invention, the particle size of the second alkaline industrial waste residue is less than 0.15mm, and preferably less than 0.145mm.
In the invention, the second alkaline industrial waste residue preferably comprises one or more of magnesium slag, carbide slag, red mud, lime slag, steel slag, metallurgical dedusting ash and alkali metal waste residue; the mass content of MgO in the magnesium slag is preferably more than or equal to 5.5 percent, and more preferably more than or equal to 6 percent; the preferable mass content of CaO in the carbide slag is more than or equal to 30 percent, and more preferably more than or equal to 30.5 percent; the pH value of the red mud is preferably more than or equal to 9.5, and more preferably more than or equal to 10; the mass content of CaO in the lime mud is preferably not less than 55%, and more preferably not less than 55.5%; the mass content of CaO in the steel slag is preferably more than or equal to 30 percent, and more preferably more than or equal to 30.5 percent; the mass content of CaO in the metallurgical dedusting ash is preferably not less than 25%, and more preferably not less than 25.5%; na in the alkali metal waste residue 2 The mass content of O is preferably not less than 30%, more preferably not less than 35%, or K 2 The content of O is preferably not less than 10% by mass, more preferablyPreferably 10.5% or more.
The admixture preferably comprises 20-30% of second tailings and/or second low-grade ores by mass percentage, and more preferably 20.5-30%.
In the present invention, the second tailings have a particle size of < 0.15mm, preferably < 0.145mm.
In the present invention, the particle size of the second low-grade ore is < 0.15mm, preferably < 0.145mm.
In the present invention, the second tailings preferably include one or more of limestone tailings, apatite tailings, wollastonite tailings, magnesite tailings, dolomite tailings, asbestos tailings, olivine tailings, talc tailings, montmorillonite tailings, mirabilite tailings, and sylvite tailings; the mass content of CaO in the limestone tailings is preferably more than or equal to 35 percent; the mass content of CaO in the apatite tailings is preferably more than or equal to 35 percent; the mass content of CaO in the wollastonite tailings is preferably more than or equal to 35 percent; the mass content of MgO in the magnesite tailings is preferably more than or equal to 25 percent; the mass content of MgO in the dolomite tailings is preferably more than or equal to 25 percent; the mass content of MgO in the asbestos ore tailings is preferably more than or equal to 25 percent; the content of MgO in the olivine tailings is preferably more than or equal to 25 percent; the mass content of MgO in the talc tailings is preferably more than or equal to 25 percent; the MgO content in the montmorillonite tailings is not less than 25% independently; na in the mirabilite tailings 2 The mass content of O is more than or equal to 30 percent; k in the potassium salt tailings 2 The mass content of O is more than or equal to 10 percent.
In the invention, the second low-grade ore preferably comprises one or more of limestone low-grade ore, apatite low-grade ore, wollastonite low-grade ore, magnesite low-grade ore, dolomite low-grade ore, asbestos ore low-grade ore, olivine low-grade ore, talc low-grade ore, montmorillonite low-grade ore, mirabilite low-grade ore and sylvite low-grade ore; the preferable mass content of CaO in the limestone low-grade ore is more than or equal to 35 percent; the preferable mass content of CaO in the apatite low-grade ore is more than or equal to 35 percent; the preferable mass content of CaO in the wollastonite low-grade ore is more than or equal to 35 percent; the preferable mass content of MgO in the magnesite low-grade ore is more than or equal to 25 percent; the preferred mass content of MgO in the dolomite low-grade ore is more than or equal to 25 percent; mg in low-grade asbestos oreThe mass content of O is preferably more than or equal to 25 percent; the preferred mass content of MgO in the olivine low-grade ore is more than or equal to 25 percent; the preferable mass content of MgO in the talc low-grade ore is more than or equal to 25 percent; the mass content of MgO in the montmorillonite low-grade ore is preferably more than or equal to 25 percent; na in the mirabilite low-grade ore 2 The mass content of O is preferably more than or equal to 30 percent; k in the low-grade potassium salt ore 2 The mass content of O is preferably not less than 10%.
In the present invention, the preparation method of the admixture preferably comprises the steps of:
and blending and grinding the second coal gangue, the second alkaline industrial waste residue, the second tailings and/or the second low-grade ore to obtain the blending material.
In the present invention, the grinding preferably includes the following three modes:
the first method is as follows: blending the second coal gangue, the second alkaline industrial waste residue, the second tailings and/or the second low-grade ore and then performing dry grinding, wherein the dry grinding time is preferably 1-8 hours; the particle size of the admixture is preferably less than or equal to 0.045mm.
The second method comprises the following steps: blending the second coal gangue, the second alkaline industrial waste residue, the second tailings and/or the second low-grade ore, adding water, and mixing to obtain slurry for wet grinding; the adding mass of the water is 30-65% of the mass of the slurry; the wet grinding time is preferably 0.5-6 h; the grain size of the admixture is preferably less than or equal to 0.045mm.
The third method comprises the following steps: adding a grinding aid to the second coal gangue, the second alkaline industrial waste residue, the second tailings and/or the second low-grade slag after mixing to obtain a mixture, and performing dry grinding or water-adding wet grinding on the mixture; the adding amount of the grinding aid is 1.5-6.5% of the mass content of the mixture. When the grinding aid is preferably the second low-grade ore, more preferably one or more of wollastonite low-grade ore, apatite low-grade ore, talc low-grade ore and montmorillonite low-grade ore, and when the grinding aid is further preferably two or more of the above components, the above two or more of the components are preferably blended in equal proportion. In the invention, the time of dry grinding after adding the grinding aid is preferably 0.5-5.5 h, the time of wet grinding after adding the grinding aid is preferably 0.5-4.5 h, and the particle size of the admixture is preferably less than or equal to 0.045mm.
The cement-free gelling material comprises 10-15% of stabilizer by mass percentage, preferably 11-14% of stabilizer by mass percentage, and more preferably 11.5-13% of stabilizer by mass percentage.
In the present invention, the stabilizer simultaneously has a retarding effect.
In the invention, the stabilizer preferably comprises the following components in percentage by mass: 60 to 75 percent of desulfurized gypsum, preferably 60.5 to 75 percent, and 25 to 40 percent of second alkaline industrial waste residue, preferably 25.5 to 40 percent.
In the present invention, the preparation method of the stabilizer preferably comprises the steps of:
and mixing the desulfurized gypsum and the second alkaline industrial waste residue, and then grinding to obtain the stabilizer.
In the present invention, the grinding preferably includes the following three modes:
the first method is as follows: after the desulfurized gypsum and the second alkaline industrial waste residue are blended, dry grinding is carried out, wherein the dry grinding time is preferably 1-8 h; the particle size of the stabilizer is preferably less than or equal to 0.045mm.
The second method comprises the following steps: mixing the desulfurized gypsum and the second alkaline industrial waste residue, adding water, and mixing to obtain slurry, and performing wet grinding on the slurry, wherein the adding mass of the water is 30-65% of the mass of the slurry; the wet grinding time is preferably 0.5-6 h; the particle size of the stabilizer is preferably less than or equal to 0.045mm.
The third method comprises the following steps: mixing the desulfurized gypsum and the second alkaline industrial waste residue, adding a grinding aid to obtain a mixture, and performing dry grinding or water-adding wet grinding on the mixture; the addition amount of the grinding aid is 1.5-6.5% of the mass content of the mixture; the grinding aid is preferably a second low-grade ore, more preferably one or more of wollastonite low-grade ore, apatite low-grade ore, talc low-grade ore and montmorillonite low-grade ore, and when the grinding aid is further preferably more than two components, the more than two components are preferably blended in equal proportion. In the invention, the time of the dry grinding after adding the grinding aid is preferably 0.5-5.5 h, and the time of the wet grinding after adding the grinding aid is preferably 0.5-4.5 h. The particle size of the stabilizer is preferably less than or equal to 0.045mm.
The cement-free gelling material provided by the invention comprises 15-25% of activity promoter, preferably 15.5-25%, and more preferably 16-24% by mass.
In the invention, the activity promoter is prepared by blending the second tailings and/or the second low-grade ore and the second coal gangue and then calcining.
In the invention, the second tailings and/or the second low-grade ore are blended with second coal gangue to obtain a blend, and then the blend is calcined to obtain the activity promoter, wherein the blend is prepared from the following components in percentage by mass: second tailings and/or second low-grade ores: the second coal gangue = 35-55%: 45 to 65%, preferably 36 to 54%:46 to 64 percent; the grain size of the mixed material is less than 0.15mm.
In the present invention, the value of the excess air coefficient α during calcination is preferably equal to or less than 1.25, and more preferably equal to or less than 1.2; the calcination temperature is preferably equal to or less than 980 ℃, and more preferably equal to or less than 975 ℃; the constant temperature time of the calcination is preferably less than or equal to 1h, and more preferably less than or equal to 55min.
The invention provides the solid CO absorption method adopting the technical scheme 2 The preparation method of the cement-free gelling material preferably comprises the following steps:
mixing the aggregate, the base material, the admixture, the stabilizer and the activity promoter uniformly to obtain the solid absorption CO 2 The cement-free gelling material.
The invention provides the solid CO absorption method adopting the technical scheme 2 As CO, using the cement-free gelling material 2 Use of absorbing and curing materials.
The invention is classified and classified into different qualities through high-calcium, high-iron and high-alkali coal gangue, corresponding fly ash and gasified ash, desulfurized gypsum, high-alkali industrial waste residue, high-calcium, high-magnesium and high-alkali tailings and low-grade oresGrinding and calcining treatment to prepare solid absorption CO 2 The cement-free gelling material.
In order to further illustrate the present invention, the following embodiments are described in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Screening a high-calcium coal gangue raw material with 17.45 percent of CaO by using a screen with a screen hole of 100mm, and directly taking coal gangue (oversize material) with +100mm as a sandstone aggregate raw material; -100mm coal gangue (screen cut material) is screened by a fly-over screen with 1mm screen hole, -1mm material is used as coal; crushing 100-1 mm materials in a level 1, then screening the crushed materials in a screen with 50mm sieve pores, and screening the crushed materials by using a fly-over screen with 1mm sieve pores, wherein the-1 mm materials are used as coal, and the 100-50 mm materials are used as raw materials of sandstone aggregate; performing 2-stage crushing on 50-1 mm materials, then screening the materials by using a sieve with 30mm sieve pores, and screening the materials by using a relaxation sieve with 1mm sieve pores, wherein the-1 mm materials are used as coal, and the 50-30 mm materials are used as raw materials of sandstone aggregate; feeding 30-1 mm materials into a 3 rd stage crushing, then screening by using a sieve with 15mm sieve pores, and then screening by using a relaxation sieve with 1mm sieve pores, wherein the-1 mm materials are used as coal, and the 30-15 mm materials are used as crushed stone; crushing the 15-1 mm material in the 4 th stage, sieving with 5mm sieve mesh, sieving with 1mm sieve mesh, and sieving with-1 mm material as coal and 15-5 mm material as crushed stone. Crushing 5-1 mm materials to be less than 3mm in the 5 th level, and then screening the materials in a screen with a screen hole of 0.15mm to obtain 3-0.15 mm materials (marked as A11) and-0.15 mm coal gangue; the material with the thickness of 3-0.15 mm is rich in CaO mineral substances, and after multi-stage crushing, a plurality of fresh surfaces such as cracks, fractures and the like are formed, so that the activity is high.
Sieving high calcium coal gangue (marked as A11) with CaO content of 17.45% and particle size of 3-0.15 mm to obtain Fe with particle size of 3-0.15 mm 2 O 3 Reference is made to the preparation of 12.09% gasified ash (designated as A21), and screened magnesium slag (designated as P11) having a particle size of 3 to 0.15mm and an MgO content of 5.85%, with reference to A11Wollastonite tailings (marked as P21) with the CaO content of 39.8% and the grain diameter of 3-0.15 mm obtained by multi-stage crushing, wherein A11 and P21 are in percentage by mass: 65%: and (2) calcining the mixture after 35% of the mixture (the excess air coefficient alpha value during calcination is 1.20, the calcination temperature is 970 ℃, and the calcination constant temperature time is 55 min) to obtain the lightweight aggregate (marked as L11), and further mixing the lightweight aggregate and the calcined aggregate according to the mass percentage content of A11: a21: p11: p21: l11=15%:15%:25%:15%: mixing 30% of the mixture to form aggregate;
high calcium fly ash (marked as G11) with CaO content of 21.21% and with the particle size of-0.12 mm, gasified ash (marked as G21) with CaO content of 25.66% and with the particle size of-0.12 mm and magnesium slag (marked as H11) with MgO content of 6.5% and with the particle size of-0.12 mm are mixed according to the mass percentage content of G11: g21: h11=45%:25%: mixing 30% of the mixture in proportion, and then grinding for 6 hours by a dry method to obtain a base material with the particle size of-0.045 mm;
coal gangue (marked as E11) with the particle size of-0.15 mm, wollastonite tailing (marked as E31) with the particle size of-0.12 mm and magnesium slag (marked as H11) with the particle size of-0.12 mm are mixed according to the mass percentage of E11: e31: h11=32%:32%: mixing 36% of the mixture in proportion, and then grinding the mixture for 6 hours by a dry method to obtain a mixture with the particle size of-0.045 mm;
the desulfurization gypsum (marked as R) is prepared by the following components in percentage by mass: magnesium slag (G) =70% having a particle diameter of-0.12 mm: mixing 30% of the mixture, and grinding for 8 hours by a dry method to obtain a stabilizer (or retarder) with the particle size of-0.045 mm;
the coal gangue with the particle size of-0.15 mm and the wollastonite tailing with the particle size of-0.12 mm are mixed according to the mass percentage of 65%: mixing 35% of the raw materials in proportion, and calcining (the excess air coefficient alpha value during calcination is 1.20, the calcination temperature is 970 ℃, and the constant temperature time of calcination is 55 min) to obtain an active promoter;
the aggregate comprises the following components in percentage by mass: base material: blending materials: a stabilizer: activity promoter =30%:30%:15%:10%: mixing at a ratio of 15% to obtain solid CO 2 The CO of the cement-free gelling material is further determined 2 The solid absorption amount was found to be 0.219gCO 2 Per gram of material.
Example 2
Mixing Fe 2 O 3 Screening the high-iron coal gangue raw material with the content of 10.92% by adopting a screen with a screen hole of 50mm, and directly taking the coal gangue (oversize material) with the size of +50mm as a sandstone aggregate raw material; -50mm gangue (screen cut) is screened by a high frequency vibrating screen with 1mm screen holes, -1mm material is used as coal; crushing a material with the diameter of 50-1 mm in a level 1, then screening the crushed material by using a screen with the screen hole of 30mm, and screening the crushed material by using a high-frequency vibrating screen with the screen hole of 1mm, wherein the material with the diameter of-1 mm is used as coal, and the material with the diameter of 50-30 mm is used as a raw material of sandstone aggregate; crushing the 30-1 mm material in the 2 nd level, sieving with a sieve with 15mm sieve pores, and sieving with a high-frequency vibrating sieve with 1mm sieve pores, wherein the material with the diameter of-1 mm is used as coal, and the material with the diameter of 30-15 mm is used as a raw material of sandstone aggregate; crushing 15-1 mm materials in a 3 rd level, screening by using a screen with 10mm sieve pores, and screening by using a high-frequency vibrating screen with 1mm sieve pores, wherein the-1 mm materials are used as coal, and the 15-10 mm materials are used as broken stones; the 4 th-level crushing is carried out on 10-1 mm materials, then the materials are put into a screen with 5mm sieve pores for screening, then a high-frequency vibrating screen with 1mm sieve pores is used for screening, the-1 mm materials are used as coal, and the 10-5 mm materials are used as broken stone. 5-1 mm material is rich in Fe 2 O 3 Crushing the mineral substances to be less than 3mm in grade 5, and then screening the crushed mineral substances by a screen with a screen hole of 0.15mm to obtain Fe with the grain diameter of 3-0.15 mm 2 O 3 After the high-iron coal gangue (marked as A12) with the content of 10.92 percent and the coal gangue with the content of-0.15 mm are crushed in multiple stages, a plurality of fresh surfaces such as cracks, fractures and the like are formed, and the activity is higher;
fe with the grain diameter of 3-0.15 mm 2 O 3 High-iron coal gangue (A12) with the content of 10.92 percent, gasified ash slag (marked as A21) with the CaO content of 15.77 percent and the grain diameter of 3-0.15 mm obtained by screening, magnesium slag (marked as P11) with the MgO content of 5.85 percent and the grain diameter of 3-0.15 mm obtained by screening, asbestos tailings (marked as P21) with the MgO content of 34.80 percent and the grain diameter of 3-0.15 mm obtained by screening, A12: p21 accounts for 60 percent by mass: and (3) calcining the mixture after 40% of the mixture is blended (the excess air coefficient alpha value during calcination is 1.15, the temperature of the calcination is 970 ℃, and the constant temperature time during calcination is 55 min) to obtain the lightweight aggregate (marked as L12), wherein the lightweight aggregate is prepared by mixing the components in percentage by mass A12:a21: p11: p21: l12=15%:15%:25%:15%: mixing 30% of the mixture to form aggregate;
mixing Na with particle size of-0.14 mm 2 O+K 2 High-alkali fly ash (marked as M11) with the O content of 11.12 percent, gasified ash (marked as M21) with the CaO content of 25.66 percent and with the grain diameter of-0.14 mm and carbide slag (marked as H12) with the CaO content of 37.90 percent and with the grain diameter of-0.14 mm, wherein the high-alkali fly ash (marked as M11) with the O content of 11.12 percent is prepared by the following steps: m21: h12=45%:25%: mixing 30% of the above materials, adding water (the water content is 30% of the prepared slurry), and wet grinding for 5 hr to obtain base material with particle size of-0.045 mm;
coal gangue (marked as E11) with the particle size of-0.15 mm, asbestos tailing admixture (marked as E21) with the particle size of-0.15 mm and carbide slag (marked as H12) with the particle size of-0.15 mm are mixed according to the mass percentage of E11: e21: h12=32%:32%: mixing at a ratio of 36%, adding water (the mass of water is 30% of the mass of the obtained slurry) to obtain slurry, and then grinding for 5h by a wet method to obtain an admixture with the particle size of-0.0454 mm;
the desulfurization gypsum (recorded as R) is prepared by the following steps: lime mud (G) =70% with particle size-0.15 mm: mixing 30% of the above materials, adding water (the water mass is 30% of the obtained slurry mass) to obtain slurry, and wet grinding for 5h to obtain stabilizer (also can be retarder) with particle size of-0.0454 mm;
coal gangue with the particle size of-0.15 mm and asbestos tailings with the particle size of-0.15 mm are mixed according to the mass percentage of 65%: blending 35% of the raw materials, and calcining (the excess air coefficient alpha value during calcination is 1.25; the calcination temperature is 980 ℃, and the calcination constant temperature time is 1 h) to obtain an active promoter;
the aggregate comprises the following components in percentage by mass: base material: blending materials: a stabilizer: activity promoter =28%:32%:12%:10%: mixing at a ratio of 18% to obtain solid absorption CO 2 The CO of the cement-free gelling material is further determined 2 The solid absorption was 0.204gCO 2 Per gram of material.
Example 3
Na was treated in accordance with the procedure of example 1 2 O+K 2 High-alkali coal gangue with O content of 7.54%Carrying out grading and quality-grading treatment to obtain Na with the grain diameter of 3-0.15 mm 2 O+K 2 High-alkali coal gangue (marked as A11) with the O content of 7.54 percent and coal gangue with the thickness of-0.15 mm;
k with the grain diameter of 3-0.15 mm 2 O+Na 2 High-alkali coal gangue (marked as A11) with O content of 7.54 percent, gasified ash slag (marked as A21) with CaO content of 19.15 percent and grain diameter of 3-0.15 mm obtained by screening, and Fe with grain diameter of 3-0.15 mm obtained by screening 2 O 3 Red mud (marked as P11) with the content of 15.47 percent, apatite tailings (marked as P21) with the CaO content of 31.8 percent and the coal gangue A11 and the apatite tailings P21 with the grain diameter of 3-0.15 mm, which are obtained by screening, are 60 percent according to the mass percentage: and (3) calcining the mixture after 40% of the mixture (the excess air coefficient alpha value during calcination is 1.15, the calcination temperature is 965 ℃, and the constant temperature time of calcination is 55 min) to obtain the active lightweight aggregate (marked as L13), wherein the active lightweight aggregate is A11: a21: p11: p21: l13=15%:15%:25%:15%: mixing 30% of the mixture to form aggregate;
high calcium fly ash (marked as M11) with CaO content of 21.21% and with particle size of-0.12 mm and Fe with particle size of-0.15 mm 2 O 3 Gasification ash (marked as M21) with the content of 14.11 percent and lime mud (marked as H13) with the content of CaO of 60.5 percent and the grain diameter of-0.15 mm, wherein the gasification ash comprises the following components in percentage by mass: m21: h13=45%:25%: after 30 percent of the mixture is blended, adding apatite tailings with the grain diameter of-0.12 mm (used as a grinding aid and accounting for 1.9 percent of the total mass of the mixture) to obtain a mixture, and performing dry grinding for 4.5 hours to obtain a base material with the grain diameter of-0.045 mm;
coal gangue (marked as E11) with the particle size of-0.15 mm, apatite tailings (marked as E31) with the particle size of-0.12 mm and lime slag (marked as H13) with the particle size of-0.15 mm are mixed according to the mass percentage of the coal gangue (marked as E11: e31: h11=34%:30%: after mixing in a proportion of 36 percent, adding apatite tailings (as a grinding aid, accounting for 2.5 percent of the total mass of the mixture) with the particle size of-0.12 mm to obtain a mixture, and performing dry grinding for 4.5 hours to obtain an admixture with the particle size of-0.045 mm;
the desulfurization gypsum (recorded as R) is prepared by the following steps: red mud (G) =70% having particle size of-0.15 mm: after 30 percent of the components are mixed, adding apatite tailings (as a grinding aid and accounting for 2.1 percent of the total mass of the mixture) with the particle size of-0.12 mm to obtain a mixture, and performing dry grinding for 4.5 hours to obtain a stabilizer (also a retarder) with the particle size of-0.045 mm;
coal gangue with the grain diameter of-0.15 mm and apatite tailings with the grain diameter of-0.12 mm are mixed according to the mass percentage content of 65%: and (2) blending 35% of the active accelerator, and calcining (wherein the excess air coefficient alpha value during calcination is 1.15, the calcination temperature is 980 ℃, and the calcination constant temperature time is 60 min) to obtain the active accelerator.
The aggregate comprises the following components in percentage by mass: base material: blending materials: a stabilizer: activity promoter =30%:30%:15%:10%: mixing at a ratio of 15% to obtain solid CO 2 The CO of the cement-free gelling material is further determined 2 The solid absorption amount was 0.197gCO 2 Per gram of material.
Example 4
Carrying out grading and quality grading treatment on the high-calcium coal gangue raw material with the CaO content of 17.45% according to the method in the embodiment 2 to obtain high-calcium coal gangue (marked as A11) with the CaO content of 17.45% and coal gangue with the grain size of 3-0.15 mm and the grain size of-0.15 mm;
sieving high calcium coal gangue (A11) with the grain diameter of 3-0.15 mm and the CaO content of 17.45 percent to obtain Fe with the grain diameter of 3-0.15 mm 2 O 3 Gasification ash slag with the content of 12.09% (marked as A21), magnesium slag with the content of MgO of 5.85% (marked as P11) and the particle size of 3-0.15 mm obtained by screening, wollastonite tailings with the content of CaO of 39.8% (marked as P21) and the content of coal gangue A11 and wollastonite tailings P21 of 3-0.15 mm obtained by screening are 65% by weight: and (2) calcining the mixture after 35% of mixing (the excess air coefficient alpha value during calcination is 1.15; the calcination temperature is 970 ℃, and the constant temperature time of calcination is 50 min) to obtain the active lightweight aggregate (marked as L11), wherein the active lightweight aggregate is prepared by mixing the components in percentage by mass A11: a21: p11: p21: l11=15%:15%:25%:15%: mixing 30% of the mixture to form aggregate;
mixing high-calcium fly ash (marked as G11) with CaO content of 21.21% and with the grain size of-0.14 mm, gasified ash (marked as G21) with CaO content of 25.66% and with the grain size of-0.15 mm, and magnesium slag (marked as H11) with the grain size of-0.15 mm according to the mass percentage of G11: g21: h11=45%:25%: mixing 30% of the above materials, adding water (35% of the water), and wet grinding for 5 hr to obtain base material with particle size of-0.045 mm;
sieving to obtain coal gangue (marked as E11) with the particle size of-0.15 mm, wollastonite tailing (marked as E31) with the particle size of-0.15 mm and magnesium slag (marked as H11) with the particle size of-0.15 mm, wherein the coal gangue (marked as E11) with the particle size of-0.15 mm, the magnesium slag comprises the following components in percentage by mass: e31: h11=32%:32%: mixing at a ratio of 36%, adding water (the mass of water is 38% of the mass of the prepared slurry) to prepare slurry, and then grinding for 5h by a wet method to obtain an admixture with the particle size of-0.045 mm;
the desulfurization gypsum (marked as R) is prepared by the following components in percentage by mass: carbide slag (G) =70% having a particle diameter of 0.15 mm: mixing 30% of the above materials, adding water (the mass of water is 35% of the mass of the obtained slurry) to obtain slurry, and wet grinding for 5h to obtain stabilizer (retarder) with particle size of-0.045 mm;
coal gangue with the particle size of-0.15 mm and wollastonite tailing with the particle size of-0.15 mm are mixed according to the mass percentage of 65%: and (2) blending 35% of the active promoter, and calcining (wherein the excess air coefficient alpha value during calcination is 1.20, the calcination temperature is 960 ℃, and the constant temperature time of calcination is 50 min) to obtain the active promoter.
The aggregate comprises the following components in percentage by mass: base material: blending: a stabilizer: activity promoter =30%:30%:15%:10%: mixing at a ratio of 15% to obtain solid absorption CO 2 The CO of the cement-free gelling material is further determined 2 The solid absorption amount was 0.256gCO 2 Per gram of material.
Example 5
Fe according to example 1 2 O 3 The high-iron coal gangue raw material with the content of 10.92 percent is subjected to grading and quality-grading treatment to obtain Fe with the grain diameter of 3-0.15 mm 2 O 3 High-iron coal gangue (marked as A12) with the content of 10.92 percent and coal gangue with the thickness of-0.15 mm;
fe with the grain diameter of 3-0.15 mm 2 O 3 High-iron coal gangue (marked as A12) with the content of 10.92 percent, gasified clinker (marked as A21) with the grain diameter of 3-0.15 mm and the CaO content of 15.77 percent and sieveThe separated magnesium slag (marked as P11) with the MgO content of 5.85 percent and the particle size of 3-0.15 mm, the asbestos tailings (marked as P21) with the MgO content of 34.8 percent and the coal gangue A12 and the asbestos tailings P21 with the particle size of 3-0.15 mm are 60 percent according to the mass percentage: and (3) mixing 40% of the mixture in percentage and calcining (the excess air coefficient alpha value during calcination is 1.20; the calcination temperature is 965 ℃, and the constant temperature time of calcination is 50 min) to obtain the lightweight aggregate (marked as L12), wherein the weight percentage of the lightweight aggregate is A12: a21: p11: p21: l12=15%:15%:25%:15%: mixing 30% of the mixture to form aggregate;
mixing Na with particle diameter of-0.15 mm 2 O+K 2 High-alkali fly ash (marked as M11) with the O content of 11.12 percent, gasified ash (marked as M21) with the CaO content of 25.66 percent and with the grain diameter of-0.15 mm and carbide slag (marked as H12) with the CaO content of 37.90 percent and with the grain diameter of-0.15 mm, wherein the high-alkali fly ash (marked as M11) with the O content of 11.12 percent is prepared by the following steps: m21: h12=45%:25%: after 30 percent of the mixture is blended, wollastonite tailings (as a grinding aid, accounting for 2.5 percent of the total mass of the mixture) with the particle size of-0.15 mm are added to obtain a mixture, and the mixture is ground for 4.5 hours by a dry method to obtain a base material with the particle size of-0.045 mm;
coal gangue (marked as E11) with the particle size of-0.15 mm, asbestos tailings (marked as E21) with the particle size of-0.15 mm and metallurgical dedusting ash (marked as H12) with the particle size of-0.15 mm are mixed according to the mass percentage of E11: e21: h12=32%:32%: after 36 percent of the mixture is blended, adding talc tailings (as a grinding aid, accounting for 2.5 percent of the total mass of the mixture) with the particle size of-0.15 mm to obtain a mixture, and then performing dry grinding for 4.5 hours to obtain an admixture with the particle size of-0.0454 mm;
the desulfurization gypsum (recorded as R) is prepared by the following steps: caustic soda waste residue (G) =70% with particle size of-0.15 mm: mixing 30% of the mixture, and grinding for 6h to obtain a stabilizer (also a retarder) with the particle size of-0.045 mm;
the coal gangue with the grain diameter of-0.15 mm and the asbestos tailings with the grain diameter of-0.15 mm are mixed according to the mass percentage of 65%: and (3) blending 35% of the raw materials, and calcining (the excess air coefficient alpha value during calcination is 1.15, the calcination temperature is 970 ℃, and the constant temperature time of calcination is 50 min) to obtain the active promoter.
The aggregate comprises the following components in percentage by mass: base material: blending materials:a stabilizer: activity promoter =28%:32%:12%:10%: mixing at a ratio of 18% to obtain solid CO 2 The CO of the cement-free gelling material is further determined 2 The solid absorption was 0.240gCO 2 /g。
Example 6
Na was treated in accordance with example 1 2 O+K 2 Carrying out grading and quality grading treatment on high-alkali coal gangue with the O content of 7.54% to obtain Na with the grain diameter of 3-0.15 mm 2 O+K 2 High-alkali coal gangue (marked as A11) with the O content of 7.54 percent and coal gangue with the thickness of-0.15 mm;
na with the grain diameter of 3-0.15 mm 2 O+K 2 High-alkali coal gangue (A11) with the O content of 7.54 percent, gasified clinker (marked as A21) with the CaO content of 19.15 percent and the grain diameter of 3-0.15 mm obtained by screening, and Fe with the grain diameter of 3-0.15 mm obtained by screening 2 O 3 Red mud (marked as P11) with the content of 15.47 percent, apatite tailings (marked as P21) with the CaO content of 31.8 percent and the coal gangue A11 and the apatite tailings P21 with the grain diameter of 3-0.15 mm obtained by screening, wherein the weight percentage content is 60 percent: and (3) calcining the mixture after 40% blending (wherein the excess air coefficient alpha value during calcination is 1.15, the calcination temperature is 970 ℃, and the calcination constant temperature time is 55 min) to obtain active lightweight aggregate (marked as L13), wherein the active lightweight aggregate is prepared from the following components in percentage by mass A11: a21: p11: p21: l13=15%:15%:25%:15%: mixing 30% of the mixture to form aggregate;
high calcium fly ash (marked as M11) with CaO content of 21.21% and with particle size of-0.14 mm and Fe with particle size of-0.14 mm 2 O 3 Gasification ash (marked as M21) with the content of 14.11 percent and lime mud (marked as H13) with the content of CaO of 60.5 percent and the grain diameter of-0.15 mm, wherein the gasification ash comprises the following components in percentage by mass: m21: h13=45%:25%: mixing 30% of the mixture in proportion, adding apatite tailings (as a grinding aid, accounting for 3% of the total mass of the mixture) with the particle size of-0.15 mm to obtain a mixture, and performing dry grinding for 4.5 hours to obtain a base material with the particle size of-0.045 mm;
coal gangue (marked as E11) with the particle size of-0.15 mm, apatite tailings (marked as E31) with the particle size of-0.14 mm and lime slag (marked as H13) with the particle size of-0.14 mm are mixed according to the mass percentage of E11: e31: h11=34%:30%: after mixing at a ratio of 36%, adding wollastonite tailings (as a grinding aid, accounting for 3% of the total mass of the mixture) with the particle size of-0.14 mm to obtain a mixture, and performing dry grinding for 4.5 hours to obtain an admixture with the particle size of-0.045 mm;
the desulfurization gypsum (marked as R) is prepared by the following components in percentage by mass: magnesium slag (G) =70% having a particle diameter of-0.15 mm: mixing 30% of the mixture, and grinding for 6h by a dry method to obtain a stabilizer (also a retarder) with the particle size of-0.0454 mm;
coal gangue with the grain size of-0.15 mm and apatite tailing with the grain size of-0.14 mm account for 65 percent by mass: and (2) blending 35% of the raw materials, and calcining (the excess air coefficient alpha value during calcination is 1.20, the calcination temperature is 960 ℃, and the constant temperature time of calcination is 55 min) to obtain the active promoter.
The aggregate comprises the following components in percentage by mass: base material: blending materials: a stabilizer: activity promoter =30%:30%:15%:10%: mixing at a ratio of 15% to obtain solid CO 2 The CO of the cement-free gelling material is further determined 2 The solid absorption amount was 0.269gCO 2 Per gram of material.
Although the above embodiments describe the present invention in detail, it is only a part of the embodiments of the present invention, not all embodiments, and other embodiments can be obtained without inventive step according to the embodiments, and all embodiments are within the scope of the present invention.

Claims (10)

1. Solid CO absorption 2 The cement-free gelling material is characterized by comprising the following components in parts by mass:
25-35 parts of aggregate, 30-45 parts of base material, 15-25 parts of admixture, 10-15 parts of stabilizer and 15-25 parts of activity promoter;
the aggregate comprises one or more of first coal gangue, first gasified ash, first alkaline industrial waste residue, first tailings, first low-grade ore and lightweight aggregate; the lightweight aggregate is prepared by mixing first tailings and/or first low-grade ores with first coal gangue and then calcining; the particle size of the aggregate is 0.15-3 mm;
the base material comprises one or more of fly ash, second gasified ash and second alkaline industrial waste residue; the grain size of the base material is less than 0.15mm;
the admixture comprises one or more of second coal gangue, second alkaline industrial waste residue, second tailings and second low-grade ore; the grain size of the admixture is less than 0.15mm;
the stabilizer comprises desulfurized gypsum and second alkaline industrial waste residue;
the active promoter is prepared by blending and calcining second tailings and/or second low-grade ores and second coal gangue;
the first coal gangue and the second coal gangue independently comprise one or more of high-calcium coal gangue, high-alkali coal gangue and high-iron coal gangue; the mass content of CaO in the high-calcium coal gangue is more than or equal to 15 percent, and the mass content of Na in the high-alkali coal gangue is more than or equal to 15 percent 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and Fe in the high-iron coal gangue 2 O 3 The mass content of the compound is more than or equal to 8 percent;
the first and second gasification ashes independently comprise one or more of a high calcium gasification ash, a high alkali gasification ash, and a high iron gasification ash; the mass content of CaO in the high-calcium gasified ash is more than or equal to 15%, and Na in the high-alkali gasified ash is 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and Fe in the high-iron gasified ash 2 O 3 The mass content of the compound is more than or equal to 8 percent;
the first and second tailings are independently tailings containing alkali or alkaline earth metals; the first low-grade ore and the second low-grade ore are low-grade ores containing alkali metals or alkaline earth metals independently, the mass content of the alkali metals in the tailings containing the alkali metals and the low-grade ores is not less than 10%, and the mass content of the alkaline earth metals in the tailings containing the alkaline earth metals and the low-grade ores is not less than 25%;
the fly ash comprises one or more of high-calcium fly ash, high-alkali fly ash and high-iron fly ash; the mass content of CaO in the high-calcium fly ash is more than or equal to 15 percent, and Na in the high-alkali fly ash 2 O and K 2 The total mass content of O is more than or equal to 5 percent, and the high iron powderFe in coal ash 2 O 3 The mass content is more than or equal to 8 percent.
2. Solid CO uptake of claim 1 2 The cement-free cementing material is characterized in that the aggregate comprises the following components in percentage by mass:
10-20% of first coal gangue, 10-20% of first gasified ash, 20-30% of first alkaline industrial waste residue, 10-20% of first tailings and/or first low-grade ore and 30-35% of lightweight aggregate.
3. Solid CO uptake of claim 1 2 The cement-free cementing material is characterized in that the base material comprises the following components in percentage by mass:
30-45% of fly ash, 15-25% of second gasified ash and 30-45% of second alkaline industrial waste residue.
4. Solid CO uptake of claim 1 2 The cement-free gelling material is characterized in that the admixture comprises the following components in percentage by mass:
35-50% of second coal gangue, 30-40% of second alkaline industrial waste residue and 20-30% of second tailings and/or second low-grade ore.
5. Solid CO uptake of claim 1 2 The cement-free gelling material is characterized in that the stabilizer comprises the following components in percentage by mass: 60-75% of desulfurized gypsum and 25-40% of second alkaline industrial waste residue.
6. Solid CO uptake of claim 1 2 The cement-free cementing material is characterized in that the second tailings and/or the second low-grade ore are mixed with second coal gangue to prepare a mixed material, and then the mixed material is calcined to obtain an activity promoter; the blended material comprises the following components in percentage by mass: second tailings and/or second low-grade ores: the second coal gangue = 35-55%: 45 to 65 percent; the grain size of the mixed material is less than 0.15mm; excess in the calcinationThe air coefficient alpha value is less than or equal to 1.25; the calcining temperature is less than or equal to 980 ℃, and the constant temperature time of calcining is less than or equal to 1h.
7. Solid CO uptake according to claim 1 or 2 2 The cement-free cementing material is characterized in that the first alkaline industrial waste residue and the second alkaline industrial waste residue independently comprise one or more of magnesium slag, carbide slag, red mud, lime slag, steel slag, metallurgical dedusting ash and alkali metal waste residue;
the mass content of MgO in the magnesium slag is more than or equal to 5.5%, the mass content of CaO in the carbide slag is more than or equal to 30%, the pH value of the red mud is more than or equal to 9.5, the mass content of CaO in the lime slag is more than or equal to 55%, the mass content of CaO in the steel slag is more than or equal to 30%, the mass content of CaO in the metallurgical dedusting ash is more than or equal to 25%, and the mass content of Na in the alkali metal waste slag is more than or equal to 5.5% 2 The mass content of O is more than or equal to 30 percent or K 2 The mass content of O is more than or equal to 10 percent.
8. Solid CO uptake according to claim 1, 2 or 3 2 The cement-free cementitious material of (1), wherein the first tailings and the second tailings independently comprise one or more of limestone tailings, apatite tailings, wollastonite tailings, magnesite tailings, dolomite tailings, asbestos tailings, olivine tailings, talc tailings, montmorillonite tailings, mirabilite tailings, and sylvite tailings;
the mass content of CaO in the limestone tailings, the apatite tailings and the wollastonite tailings is not less than 35% independently; the MgO content in the magnesite tailings, the dolomite tailings, the asbestos tailings, the olivine tailings, the talc tailings and the montmorillonite tailings is independently more than or equal to 25 percent; na in the mirabilite tailings 2 The mass content of O is more than or equal to 30 percent; k in the potassium salt tailings 2 The mass content of O is more than or equal to 10 percent;
the first low-grade ore and the second low-grade ore independently comprise limestone low-grade ore, apatite low-grade ore, wollastonite low-grade ore, magnesite low-grade ore, dolomite low-grade ore, asbestos ore low-grade ore, olivine low-grade ore, talc low-grade ore, montmorillonite low-grade ore, mirabilite low-grade ore and sylvite low-grade oreOne or more of the grade ores; the CaO content in the limestone low-grade ore, the apatite low-grade ore and the wollastonite low-grade ore is not less than 35% by mass independently; the MgO content in the magnesite low-grade ore, the dolomite low-grade ore, the asbestos ore low-grade ore, the olivine low-grade ore, the talc low-grade ore and the montmorillonite low-grade ore is independently more than or equal to 25 percent; na in the mirabilite low-grade ore 2 The mass content of O is more than or equal to 30 percent; k in the low-grade potassium salt ore 2 The mass content of O is more than or equal to 10 percent.
9. Solid CO uptake according to claim 1 or 2 2 The cement-free cementing material is characterized in that the preparation method of the lightweight aggregate comprises the following steps:
the first tailings and/or the first low-grade ores are/is mixed with the first coal gangue and then calcined under the condition of supplying excess air to obtain the lightweight aggregate; the mass ratio of the first tailings and/or the first low-grade ores to the first coal gangue is (30-50) to (50-70); the excess air coefficient alpha value during calcination is less than or equal to 1.25; the calcining temperature is less than or equal to 980 ℃, and the constant temperature time of calcining is less than or equal to 1h.
10. Use of the cement-free gelling material of any of claims 1-9 for CO 2 Absorption and curing.
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