CN115403312A - High-sulfur tailing cementing material and preparation method and application thereof - Google Patents
High-sulfur tailing cementing material and preparation method and application thereof Download PDFInfo
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to the technical field of resource utilization of sulfur-containing tailings, and particularly discloses a high-sulfur tailing cementing material and a preparation method and application thereof. The high-sulfur tailing cementing material comprises the following raw material components in parts by weight: 200 to 220 parts of cement, 70 to 90 parts of fly ash, 40 to 60 parts of high-sulfur tailings, 40 to 60 parts of mineral powder, 6 to 8 parts of limestone powder, 6 to 12 parts of barium salt, 13 to 15 parts of modified bentonite, 7 to 13 parts of activated alumina and 3 to 5 parts of excitant. The high-sulfur tailing cementing material provided by the invention is scientific in compatibility, can reduce the concentration of sulfate ions in the high-sulfur tailing-containing concrete, prevents expansion damage caused by crystallization of secondary gypsum, ettringite and the like, effectively improves the internal structure of the concrete, and achieves the purpose of improving the strength, compactness and durability of the concrete.
Description
Technical Field
The invention relates to the technical field of resource utilization of sulfur-containing tailings, in particular to a high-sulfur tailing cementing material and a preparation method and application thereof.
Background
The tailings are industrial solid wastes generated in the ore dressing and smelting process, are large in quantity, can cause environmental pollution and secondary geological disasters such as dam break of a tailing pond, landslide and the like due to large accumulation of the tailings, and are important hazard sources and pollution sources. Therefore, the resource utilization of the tailings becomes a consensus of all communities, and is also a key direction for recycling industrial solid waste resources in China at present.
In the prior art, high-sulfur metal tailings are used as an admixture for preparing concrete, so that the aim of consuming a large amount of tailings can be fulfilled, the consumption of cement in the concrete can be reduced, energy is saved, emission is reduced, and the shortage of mineral admixtures such as fly ash and slag is relieved. However, the tailings generated from the metal ores usually contain high sulfides, and the tailings react with cement hydration products to generate expansive phase products such as ettringite and secondary gypsum, have strong adsorption capacity, can generate great expansion stress, cause the generation and expansion of micro cracks in the concrete, have loose structure, cause the concrete to obviously expand, even crack and damage, seriously affect the safety and durability of concrete materials and structures, and have very limited effect even if a chemical additive is adopted to modify a filling body. Therefore, how to solve the problem that the addition of the high-sulfur tailings can cause irregular cracks to the concrete to reduce the compressive strength and the corrosion resistance of the concrete is still a difficulty in the development of the resource utilization technology of the sulfur-containing tailings at present.
Disclosure of Invention
In order to solve the problems that the addition of high-sulfur tailings in the prior art can cause irregular cracks to the concrete, so that the compressive strength and the corrosion resistance of the concrete are reduced, the invention provides the high-sulfur tailings cementing material, which can reduce the concentration of sulfate ions in the concrete containing the high-sulfur tailings, prevent the expansion damage caused by crystallization of secondary gypsum, ettringite and the like, effectively improve the internal structure of the concrete, and achieve the purposes of improving the strength, the compactness and the durability of the concrete.
The invention also provides a preparation method of the high-sulfur tailing cementing material.
The invention also provides high-sulfur tailing concrete prepared by adopting the high-sulfur tailing cementing material, the internal structures of the high-sulfur tailing concrete are bonded with each other and are not easy to separate from each other, and the high-sulfur tailing concrete has better working performance compared with common concrete.
The invention also provides a preparation method of the high-sulfur tailing concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a high-sulfur tailing cementing material, which comprises the following raw material components in parts by weight: 200-220 parts of cement, 70-90 parts of fly ash, 40-60 parts of high-sulfur tailings, 40-60 parts of mineral powder, 6-8 parts of limestone powder, 6-12 parts of barium salt, 13-15 parts of modified bentonite, 7-13 parts of activated alumina and 3-5 parts of an excitant; wherein the barium salt is prepared from the following components in a mass ratio of 1.2-1.5: 2.1-2.5: 2.0 to 2.4 of barium chloride, barium hydroxide and barium nitrate.
Compared with the prior art, the high-sulfur tailing cementing material provided by the invention utilizes the active effect and filling effect of the fly ash, the limestone powder, the mineral powder and the high-sulfur tailing to modify and reinforce the concrete, can effectively improve the internal structure of the concrete, and achieves the purpose of improving the strength, compactness and durability of the concrete. Meanwhile, barium chloride, barium hydroxide and barium nitrate are used in a composite mode, sulfate ions invading the concrete are effectively cured, barium sulfate crystals are formed and micro cracks in the concrete are filled, the sulfate corrosion resistance of the concrete is greatly improved, the preferred proportion of the barium salt is stronger in adsorption effect on the sulfate ions, and the sulfate corrosion resistance of the concrete is obviously improved. The fly ash, limestone powder, mineral powder and high-sulfur tailings selected by the high-sulfur tailing cementing material provided by the invention are industrial waste materials, so that the production cost is saved, the secondary utilization of waste is realized, and the high-sulfur tailing cementing material has great significance for protecting the ecological environment.
The fly ash is a substance taking active silicon dioxide, active alumina and active calcium oxide as main components, and can convert calcium hydroxide unfavorable for concrete into favorable C-S-H gel (volcanic ash effect), namely, the glass-state active silicon oxide and alumina in the fly ash react with calcium hydroxide in cement to generate calcium silicate hydrate and calcium aluminate hydrate, so that gaps of the cement are filled, and on one hand, the gap of the cement is increasedThe strength and compactness of the concrete are added, the impermeability is improved, and Ca (OH) is weakened 2 The chance of damage to the concrete by expansion of the crystals.
The high-sulfur tailings not only have a certain gelling effect on concrete, but also can fully utilize the characteristic of small particle size to uniformly fill gaps among aggregates, so that the internal framework of the concrete is more compact.
The mineral powder is a substance which is obtained by cold quenching blast furnace waste residues of a steel plant and then finely grinding the blast furnace waste residues to a certain fineness requirement, takes calcium oxide and aluminum oxide as main components, has good morphological effect, micro-aggregate effect and volcanic ash effect, can improve the hydration mechanism of a cementing material and the microstructure of concrete, refines the aperture of the concrete, and increases the total proportion of harmless holes and less harmful holes. After hydration, granular hydrated sodium calcium aluminosilicate minerals, CSH gel and a small amount of amorphous gel substances can be generated, and the gel substances can fill the pores of the concrete interface, so that the concrete structure is more compact.
The limestone powder has the filling and dispersing functions in concrete, and can improve the workability and water retention of fresh concrete and improve the excellent performances of impermeability, durability and the like of hardened concrete by optimizing the particle grading. In addition, the limestone powder can deposit calcium hydroxide, play a role of crystal nucleus, accelerate the hydration of cement particles, and improve the early strength of concrete, thereby improving the sulfate erosion resistance of the concrete.
Although sulfide is introduced by adding the high-sulfur tailings, corrosion reactions of the formula (1), the formula (2) and the formula (3) occur to generate expansive products such as ettringite and secondary gypsum, and further micro cracks are generated and expanded, the structure is loose, and the service performance of the concrete is deteriorated. However, the inventor can fix the sulfate ions intruding into the pore network of the concrete in the form of barium sulfate by adding a certain amount of barium salt, modified bentonite, activated alumina and an activator into the high-sulfur tailing cementing material, and although ettringite is still generated, the amount of ettringite is obviously reduced. The reason may be that the reactions of the formulae (3) and (4) occur simultaneously in the concrete, and the barium sulfate has a lower solubility than calcium sulfate and thus invades into the concreteSO in concrete 4 2- Preferably with Ba 2+ Ion reaction to produce barium sulfate, and SO consumption in barium sulfate production 4 2- Simultaneously, the sediment fills the capillary pores of the concrete, thereby reducing SO 4 2- The formation and accumulation of expanding ettringite is hindered by the erosion rate of (2). The specific reaction process comprises the following steps:
Ca(OH) 2 +SO 4 2- +2H 2 O→CaSO 4 ·2H 2 O+2OH - (1)；
Na 2 SO 4 ·10H 2 O+Ca(OH) 2 →CaSO 4 ·2H 2 O+2NaOH+8H 2 O (2)；
3(CaSO 4 ·2H 2 O)+3CaO·Al 2 O 3 ·6H 2 O+19H 2 O→3CaO·Al 2 O 3 ·3CaSO 4 ·31H 2 O(3)；
Ba(OH) 2 +Na 2 SO 4 →BaSO 4 +2NaOH(4)。
optionally, the cement is P.O42.5 Portland cement with a density of 3.06g/cm 3 ～3.12g/cm 3 。
Optionally, the fly ash is second-grade fly ash.
Optionally, the particle size of the high-sulfur tailings is 10-75 μm.
Optionally, the specific surface area of the ore powder is 400m 2 /Kg～450m 2 /Kg。
Optionally, the specific surface area of the limestone powder is more than 700m 2 /Kg。
The preferable compounding of the fly ash, the high-sulfur tailings, the mineral powder and the limestone powder plays stronger volcanic ash activity and filling effect in a gelling system, effectively improves the microstructure of concrete, forms a firm concrete supporting structure and obviously improves the mechanical properties of the concrete in all aspects; meanwhile, the specific mass ratio can ensure that the prepared concrete has better fluidity, water retention property and cohesiveness.
Optionally, the specific surface area of the activated alumina is 409.03m 2 /g～440.10m 2 /g。
The preferred active alumina can promote the substances in the cement to react with the substances in the cement to generate ettringite at a very high speed, reduce the content of calcium hydroxide and accelerate C 3 S is hydrated, so that the strength of the concrete is further improved; meanwhile, the barium salt, the modified bentonite and the activator have a synergistic effect, and when the barium salt, the modified bentonite and the activator are mixed in a proper proportion, the compactness and the strength of the concrete can be improved, and the service life of the concrete is further prolonged.
Optionally, the activator is sodium hydroxide.
Optionally, the preparation method of the modified bentonite comprises the following steps: activating the bentonite for 2.5 to 3.0 hours at the temperature of between 500 and 550 ℃, and then mixing the activated bentonite with calcium oxide for 3.2 to 3.3:1 to 1.1, and grinding the mixture until the specific surface area reaches 340m 2 /Kg～370m 2 and/Kg, obtaining the modified bentonite.
The optimized modified bentonite is roasted and calcium oxide is added for grinding to realize full activation, the interlayer spacing and the specific surface area are larger, the adsorption effect is enhanced, sulfate ions can be effectively adsorbed, and montmorillonite in the bentonite can participate in the hydration reaction of cement and is interwoven with ettringite to form a more compact structure, fewer pores are generated, and the mechanical property of the cementing material is improved. Meanwhile, the modified bentonite and the activator are compounded to form a composite excitation system, so that the fly ash and mineral powder components with low chemical activity can be excited, the activation of the chemical properties of the fly ash and the mineral powder is realized, the compactness and the anti-erosion capability of the material are improved synergistically, the water-absorbing and water-retaining effects are good, the hydration environment required by the cementing material is maintained, and the later strength of the concrete is improved.
In a second aspect, the invention provides a preparation method of the high-sulfur tailing cementing material, which comprises the following steps:
(1) Mixing the modified bentonite and the excitant according to the weight ratio, and then grinding to obtain the product with the specific surface area of 400m 2 /Kg～450m 2 (iv) Kg of powder;
(2) And uniformly mixing the powder with the cement, the fly ash, the high-sulfur tailing, the mineral powder, the limestone powder, the barium salt and the activated alumina to obtain the high-sulfur tailing cementing material.
In a third aspect, the invention provides high-sulfur tailing sand concrete which comprises 400-500 parts of the high-sulfur tailing sand cementing material, 950-1000 parts of coarse aggregate, 750-800 parts of fine aggregate, 145-155 parts of water and 12-14 parts of a water reducing agent.
Compared with the prior art, the high-sulfur tailing concrete provided by the invention can form a gelled structural system almost without pores through the mutual matching action of the coarse aggregate, the fine aggregate, the high-sulfur tailing cementing material and the water reducing agent, greatly enhances the strength of the concrete, enables the internal structures of the concrete to be mutually bonded and not to be easily separated, has better working performance compared with common concrete, has the slump reaching 235mm after the concrete is taken out of the machine, can reach 575mm, and has the compression strength of 28d reaching 62.2MPa. Meanwhile, the high-sulfur tailings are used as the admixture to be applied to the preparation of the concrete, so that the secondary utilization of the tailing solid waste is realized, the cement consumption of single-component concrete can be reduced, the problem of insufficient supply of I-grade and II-grade fly ash is solved, the cost of the single-component concrete is reduced by 6-10%, the phenomenon that the strength of the concrete is reduced due to the fact that the high-sulfur tailings are used as cemented filling aggregates is avoided, and the method has important significance for building green mines and sustainable development of mineral resources.
Optionally, the coarse aggregate is continuous graded broken stone with the particle size of 5-20 mm.
Optionally, the fine aggregate has fineness modulus of 2.7-3.0 and apparent density of 2520kg/m 3 ～2620kg/m 3 The river sand.
Grading can be effectively formed among the optimized coarse aggregate, fine aggregate and high-sulfur tailings, so that the bearing performance of the whole concrete is improved, the whole concrete structure is compact and hard, and the compressive strength of the concrete is improved.
Optionally, the water reducing agent is a polycarboxylic acid water reducing agent, the solid content is 35% -40%, and the water reducing rate is 31% -32.1%.
The optimized water reducing agent is helpful for reducing the water-cement ratio, can meet the workability requirement of concrete, further enables the concrete to reach a self-compaction state, and is convenient for construction.
In a fourth aspect, the invention provides a preparation method of the high-sulfur tailing concrete, which comprises the following steps:
(1) Uniformly mixing the coarse aggregate and the fine aggregate according to the weight ratio to obtain a prepared material;
(2) And mixing and stirring the prepared material, the high-sulfur tailing cementing material and water for the first time at the rotating speed of 300-350 r/min, standing for 30-60 s, then adding the water reducing agent, and mixing and stirring for the second time at the rotating speed of 300-350 r/min to obtain the high-sulfur tailing concrete.
Optionally, in the step (2), the first mixing and stirring time is 1min to 2min, and the second mixing and stirring time is 3min to 4min.
The optimal mode of stirring for several times can enable the surface of the aggregate to be uniformly wrapped with the cementing material film, improve the microcrack defect of the aggregate, improve the compactness, further enhance the frost resistance, impermeability and anti-erosion capability of the concrete, greatly reduce the cracking risk of the concrete and improve the strength of the concrete.
In conclusion, the high-sulfur tailing cementing material, the preparation method and the application thereof provided by the invention have the following beneficial effects:
(1) According to the invention, the fly ash, the high-sulfur tailings, the mineral powder and the limestone powder are added into the high-sulfur tailing concrete, so that the high-volcanic ash activity and the filling effect are exerted, the microstructure of the concrete is effectively improved, a gel structure system almost without pores is formed, the mechanical property of the concrete is obviously enhanced, the risk of early cracking of the concrete is greatly reduced, sulfate ions intruding into the concrete are effectively cured through the synergistic action of barium salt, modified bentonite, active alumina and an activator, the sulfate corrosion resistance of the concrete is greatly improved, the compactness and the strength of the concrete are improved, and the service life of the concrete is further prolonged.
(2) The preparation method of the high-sulfur tailing cementing material provided by the invention has simple material processing and production processes, and a large amount of industrial wastes such as fly ash, limestone powder, mineral powder and high-sulfur tailing are utilized.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Example 1
The embodiment provides a high-sulfur tailing cementing material which comprises the following raw material components in parts by weight: 200 parts of cement, 70 parts of fly ash, 40 parts of high-sulfur tailings, 40 parts of mineral powder, 6 parts of limestone powder, 6 parts of barium salt, 13 parts of modified bentonite, 7 parts of activated alumina and 3 parts of an excitant.
Wherein the barium salt is prepared from the following components in a mass ratio of 1.2:2.1:2.0 of barium chloride, barium hydroxide and barium nitrate; the fly ash is second-grade fly ash; the grain size of the high-sulfur tailings is 10-75 mu m; the specific surface area of the mineral powder is 400m 2 /Kg～450m 2 Kg; the specific surface area of the limestone powder is more than 700m 2 Kg; the specific surface area of the activated alumina is 409.03m 2 /g～440.10m 2 (ii)/g; the excitant is sodium hydroxide; the preparation method of the modified bentonite comprises the following steps: bentonite was activated at 500 ℃ for 2.5h, then mixed with calcium oxide at a rate of 3.3:1, and grinding until the specific surface area reaches 340m 2 /Kg～370m 2 and/Kg, obtaining the modified bentonite.
The embodiment also provides a preparation method of the high-sulfur tailing cementing material, which comprises the following process steps of:
(1) Mixing the modified bentonite and the excitant according to the weight ratio, and then grinding to obtain the product with the specific surface area of 400m 2 /Kg～450m 2 (iv) Kg of powder;
(2) And uniformly mixing the powder with cement, fly ash, high-sulfur tailings, mineral powder, limestone powder, barium salt and activated alumina to obtain the high-sulfur tailing cementing material.
Example 2
The embodiment provides a high-sulfur tailing cementing material which comprises the following raw material components in parts by weight: 220 parts of cement, 90 parts of fly ash, 60 parts of high-sulfur tailings, 60 parts of mineral powder, 8 parts of limestone powder, 12 parts of barium salt, 15 parts of modified bentonite, 13 parts of activated alumina and 5 parts of an exciting agent.
Wherein the barium salt is prepared from the following components in a mass ratio of 1.5:2.5:2.4 of a mixture of barium chloride, barium hydroxide and barium nitrate; the fly ash is second-grade fly ash; the grain size of the high-sulfur tailings is 10-75 mu m; the specific surface area of the mineral powder is 400m 2 /Kg～450m 2 Kg; the specific surface area of the limestone powder is more than 700m 2 Kg; the specific surface area of the activated alumina is 409.03m 2 /g～440.10m 2 (ii)/g; the excitant is sodium hydroxide; the preparation method of the modified bentonite comprises the following steps: bentonite was activated at 550 ℃ for 3.0h, then mixed with calcium oxide at a rate of 3.2:1.1, and grinding until the specific surface area reaches 340m 2 /Kg～370m 2 And Kg, obtaining the modified bentonite.
The embodiment also provides a preparation method of the high-sulfur tailing cementing material, which comprises the following process steps of:
(1) Mixing the modified bentonite and the excitant according to the weight ratio, and then grinding to obtain the product with the specific surface area of 400m 2 /Kg～450m 2 Powder per Kg;
(2) And uniformly mixing the powder with cement, fly ash, high-sulfur tailings, mineral powder, limestone powder, barium salt and activated alumina to obtain the high-sulfur tailing cementing material.
Example 3
The embodiment provides a high-sulfur tailing cementing material which comprises the following raw materials in parts by weight: 210 parts of cement, 80 parts of fly ash, 50 parts of high-sulfur tailings, 50 parts of mineral powder, 7 parts of limestone powder, 9 parts of barium salt, 14 parts of modified bentonite, 10 parts of activated alumina and 4 parts of an exciting agent.
Wherein the barium salt is prepared from the following raw materials in a mass ratio of 1.3:2.3:2.2A mixture of barium chloride, barium hydroxide and barium nitrate; the fly ash is second-grade fly ash; the grain size of the high-sulfur tailings is 10-75 mu m; the specific surface area of the mineral powder is 400m 2 /Kg～450m 2 Per Kg; the specific surface area of the limestone powder is more than 700m 2 Per Kg; the specific surface area of the activated alumina is 409.03m 2 /Kg～440.10m 2 (ii)/g; the excitant is sodium hydroxide; the preparation method of the modified bentonite comprises the following steps: bentonite was activated at 530 ℃ for 2.8h and then mixed with calcium oxide at a rate of 3.3:1.1, and grinding until the specific surface area reaches 340m 2 /Kg～370m 2 And Kg, obtaining the modified bentonite.
The embodiment also provides a preparation method of the high-sulfur tailing cementing material, which comprises the following process steps:
(1) Mixing the modified bentonite and the excitant according to the weight ratio, and then grinding to obtain the product with the specific surface area of 400m 2 /Kg～450m 2 Powder per Kg;
(2) And uniformly mixing the powder with cement, fly ash, high-sulfur tailings, mineral powder, limestone powder, barium salt and activated alumina to obtain the high-sulfur tailing cementing material.
Example 4
The embodiment provides high-sulfur tailing concrete which comprises the following raw material components in parts by weight: 400 parts of high-sulfur tailing cementing material prepared in example 1, 950 parts of coarse aggregate, 750 parts of fine aggregate, 145 parts of water and 12 parts of water reducing agent.
Wherein the coarse aggregate is continuous graded broken stone with the grain diameter of 5 mm-20 mm; the fine aggregate has fineness modulus of 2.7-3.0 and apparent density of 2520kg/m 3 ～2620kg/m 3 The river sand of (1); the water reducing agent is a polycarboxylic acid water reducing agent.
The embodiment also provides a preparation method of the high-sulfur tailing concrete, which comprises the following process steps:
(1) Uniformly mixing coarse aggregate and fine aggregate according to the weight ratio to obtain prepared materials;
(2) And mixing and stirring the prepared material, the high-sulfur tailing cementing material and water at the rotating speed of 300r/min for 1min, standing for 30s, then adding a water reducing agent, and mixing and stirring at the rotating speed of 300r/min for 3min again to obtain the high-sulfur tailing concrete.
Example 5
The embodiment provides high-sulfur tailing concrete which comprises the following raw material components in parts by weight: 500 parts of high-sulfur tailing cementing material prepared in example 2, 1000 parts of coarse aggregate, 800 parts of fine aggregate, 155 parts of water and 14 parts of water reducing agent.
Wherein the coarse aggregate is continuous graded broken stone with the grain size of 5 mm-20 mm; the fine aggregate has fineness modulus of 2.7-3.0 and apparent density of 2520kg/m 3 ～2620kg/m 3 The river sand of (1); the water reducing agent is a polycarboxylic acid water reducing agent.
The embodiment also provides a preparation method of the high-sulfur tailing concrete, which comprises the following process steps:
(1) Uniformly mixing the coarse aggregate and the fine aggregate according to the weight ratio to obtain prepared materials;
(2) And mixing and stirring the prepared materials, the high-sulfur tailing cementing material and water at the rotating speed of 350r/min for 2min, standing for 60s, then adding a water reducing agent, and mixing and stirring at the rotating speed of 350r/min for 4min again to obtain the high-sulfur tailing concrete.
Example 6
The embodiment provides high-sulfur tailing concrete which comprises the following raw material components in parts by weight: 450 parts of high-sulfur tailing cementing material prepared in example 3, 980 parts of coarse aggregate, 780 parts of fine aggregate, 150 parts of water and 13 parts of water reducing agent.
Wherein the coarse aggregate is continuous graded broken stone with the grain diameter of 5 mm-20 mm; the fine aggregate has fineness modulus of 2.7-3.0 and apparent density of 2520kg/m 3 ～2620kg/m 3 The river sand of (1); the water reducing agent is a polycarboxylic acid water reducing agent.
The embodiment also provides a preparation method of the high-sulfur tailing concrete, which comprises the following process steps:
(1) Uniformly mixing coarse aggregate and fine aggregate according to the weight ratio to obtain prepared materials;
(2) And mixing and stirring the prepared materials, the high-sulfur tailing cementing material and water at the rotating speed of 330r/min for 1.5min, standing for 45s, then adding a water reducing agent, and mixing and stirring at the rotating speed of 320r/min for 3.5min to obtain the high-sulfur tailing concrete.
Comparative example 1
The comparative example provides a high-sulfur tailing concrete, the composition of the raw materials and the preparation method of which are the same as those in example 4, with the difference that: the addition amount of barium salt in 1 part of the high-sulfur tailing cementing material is 18 parts.
Comparative example 2
The comparative example provides a high-sulfur tailing concrete, the composition of the raw materials and the preparation method of which are the same as those in example 4, with the difference that: the barium salt is prepared from the following components in a mass ratio of 1.2:6:2.0 parts of barium chloride, barium hydroxide and barium nitrate.
Comparative example 3
The comparative example provides a high-sulfur tailing concrete, the composition of the raw materials and the preparation method of which are the same as those in example 4, with the difference that: the modified bentonite is replaced by kaolin.
In order to prove the effect of the high-sulfur tailing concrete prepared in the examples and the comparative examples of the invention, the high-sulfur tailing concrete in the examples 4 to 6 and the comparative examples 1 to 3 is tested according to the national standard method, and the test results are shown in the following table:
TABLE 1 test results of concrete Properties
The high-sulfur tailing concrete provided by the invention has the advantages that the compactness and the strength are obviously improved after the high-sulfur tailing cementing material is added, the sulfate erosion resistance is effectively improved, the flowability and the slump loss resistance are good, the purposes of improving the safety and the durability of the concrete are achieved, the preparation cost is low, the secondary utilization of solid wastes is realized, and the problem that the strength of the concrete is reduced because the high-sulfur tailing is used as a cemented filling aggregate is solved.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the invention is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (10)
1. A high-sulfur tailing cementing material is characterized in that: the material comprises the following raw material components in parts by weight: 200 to 220 parts of cement, 70 to 90 parts of fly ash, 40 to 60 parts of high-sulfur tailings, 40 to 60 parts of mineral powder, 6 to 8 parts of limestone powder, 6 to 12 parts of barium salt, 13 to 15 parts of modified bentonite, 7 to 13 parts of activated alumina and 3 to 5 parts of excitant; wherein the barium salt is prepared from the following components in a mass ratio of 1.2-1.5: 2.1-2.5: 2.0 to 2.4 of barium chloride, barium hydroxide and barium nitrate.
2. The high sulfur tailings cementitious material of claim 1, wherein: the fly ash is secondary fly ash; and/or
The grain size of the high-sulfur tailings is 10-75 mu m; and/or
The specific surface area of the mineral powder is 400m 2 /Kg～450m 2 /Kg。
3. The high sulfur tailings cementitious material of claim 1, wherein: the specific surface area of the limestone powder is more than 700m 2 Per Kg; and/or
The specific surface area of the activated alumina is 409.03m 2 /g～440.10m 2 (iv) g; and/or
The excitant is sodium hydroxide.
4. The high sulfur tailings cementitious material of claim 1, wherein: the preparation method of the modified bentonite comprises the following steps: activating the bentonite at 500-550 ℃ for 2.5-3.0 h, and then mixing the bentonite with calcium oxide at a ratio of 3.2-3.3: 1 to 1.1, and grinding the mixture until the specific surface area reaches 340m 2 /Kg～370m 2 and/Kg, obtaining the modified bentonite.
5. The method for preparing the high-sulfur tailing cement of any one of claims 1 to 4, characterized in that: the method comprises the following steps:
(1) Mixing the modified bentonite and the bentonite according to the weight ratioMixing the hair agents, and grinding to obtain the product with specific surface area of 400m 2 /Kg～450m 2 Powder per Kg;
(2) And uniformly mixing the powder with the cement, the fly ash, the high-sulfur tailing, the mineral powder, the limestone powder, the barium salt and the activated alumina to obtain the high-sulfur tailing cementing material.
6. The high-sulfur tailing concrete is characterized in that: comprising the high-sulfur tailing cementitious material according to any one of claims 1 to 4.
7. The high sulfur tailings concrete of claim 6, wherein: the high-sulfur tailing concrete comprises the following raw material components in parts by weight: 400-500 parts of high-sulfur tailing cementing material, 950-1000 parts of coarse aggregate, 750-800 parts of fine aggregate, 145-155 parts of water and 12-14 parts of water reducing agent.
8. The high sulfur tailings concrete of claim 7, wherein: the coarse aggregate is continuous graded broken stone with the grain size of 5-20 mm; and/or
The fine aggregate has fineness modulus of 2.7-3.0 and apparent density of 2520kg/m 3 ～2620kg/m 3 The river sand of (1); and/or
The water reducing agent is a polycarboxylic acid water reducing agent.
9. The method for preparing high-sulfur tailing concrete according to claim 7 or 8, characterized in that: the method comprises the following steps:
(1) Uniformly mixing the coarse aggregate and the fine aggregate according to the weight ratio to obtain a prepared material;
(2) And mixing and stirring the prepared material, the high-sulfur tailing cementing material and water for the first time at the rotating speed of 300-350 r/min, standing for 30-60 s, adding the water reducing agent, and mixing and stirring for the second time at the rotating speed of 300-350 r/min to obtain the high-sulfur tailing concrete.
10. The method for preparing the high-sulfur tailing concrete according to claim 9, characterized in that: in the step (2), the first mixing and stirring time is 1-2 min, and the second mixing and stirring time is 3-4 min.
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| CN109437649A (en) * | 2018-12-29 | 2019-03-08 | 浙江广厦建设职业技术学院 | A kind of preservative of Concrete Resist Reinforcing Sulfate Corrosion and preparation method thereof |
| KR20190091896A (en) * | 2018-01-30 | 2019-08-07 | 정하익 | Eco outputting, equipment, material, manufacture, construction, method, facility, building, structure |
| CN114477914A (en) * | 2022-03-02 | 2022-05-13 | 北京科技大学 | Full-tailing filling material and preparation method thereof |
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| KR20190091896A (en) * | 2018-01-30 | 2019-08-07 | 정하익 | Eco outputting, equipment, material, manufacture, construction, method, facility, building, structure |
| CN109437649A (en) * | 2018-12-29 | 2019-03-08 | 浙江广厦建设职业技术学院 | A kind of preservative of Concrete Resist Reinforcing Sulfate Corrosion and preparation method thereof |
| CN114477914A (en) * | 2022-03-02 | 2022-05-13 | 北京科技大学 | Full-tailing filling material and preparation method thereof |
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| CN115893878A (en) * | 2023-01-10 | 2023-04-04 | 中冶南方都市环保工程技术股份有限公司 | Method for preparing cemented mine tailing filling material by coupling solid wastes in steel chemical industry |
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