CN115403312B - 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 sulfur-containing tailing recycling, 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: 200-220 parts of cement, 70-90 parts of fly ash, 40-60 parts of high-sulfur tailing, 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 exciting agent. The high-sulfur tailing cementing material provided by the invention has scientific compatibility, can reduce the sulfate ion concentration in the concrete containing the high-sulfur tailings, prevent 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, compactness and durability of the concrete.
Description
Technical Field
The invention relates to the technical field of sulfur-containing tailing recycling, 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, the quantity is huge, and the accumulation of the tailings in a large quantity can cause environmental pollution and even secondary geological disaster problems such as dam break, landslide and the like of a tailing pond, so that the tailings are a great danger source and a pollution source. Therefore, the recycling of the tailings becomes consensus of all communities and is an important direction of recycling of industrial solid waste resources in China.
In the prior art, the high-sulfur metal tailing is used as an admixture for preparing concrete, so that the aim of consuming a large amount of tailing can be fulfilled, the consumption of cement in the concrete can be reduced, the energy is saved, the emission is reduced, and the shortage condition of mineral admixtures such as fly ash, slag and the like is relieved. However, the tailings produced by the metal ore usually contain higher sulfides, and the tailings react with cement hydration products to generate ettringite, secondary gypsum and other expansion phase products, so that the adsorption capacity is high, and extremely large expansion stress can be generated, so that micro cracks in the concrete are generated and expanded, the structure is loose, the concrete is obviously expanded, even cracked and damaged, the safety and durability of concrete materials and structures are seriously affected, and even if a chemical additive is used for modifying a filling body, the effect is very limited. Therefore, how to solve the problem that the compressive strength and erosion resistance of concrete are reduced due to irregular cracks generated in the concrete caused by adding high-sulfur tailings is still a difficulty in development of the prior sulfur-containing tailings recycling technology.
Disclosure of Invention
In order to solve the problems that in the prior art, irregular cracks are generated in concrete to reduce the compressive strength and erosion resistance of the concrete, and the like, the invention provides the high-sulfur tailing cementing material which can reduce the sulfate ion concentration in the concrete containing the high-sulfur tailings, prevent 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, compactness and durability of the concrete.
The invention also provides a preparation method of the high-sulfur tailing cementing material.
The invention also provides the high-sulfur tailing concrete prepared from the high-sulfur tailing cementing material, and the internal structures of the high-sulfur tailing concrete are mutually adhered and are not easy to separate, so that the high-sulfur tailing concrete has better working performance compared with common concrete.
The invention also provides a preparation method of the high-sulfur tail sand concrete.
In order to achieve the aim of the invention, 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 tailing, 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 exciting agent; wherein the barium salt comprises the following components in percentage by mass of 1.2-1.5: 2.1 to 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 fly ash, limestone powder, mineral powder and high-sulfur tailing to modify and strengthen concrete, can effectively improve the internal structure of concrete, achieves the aim of improving the strength, compactness and durability of concrete, and can cure sulfate ions invaded in the concrete by the composite use of barium salt, modified bentonite, active alumina, exciting agent and the powder, effectively prevent expansion damage caused by crystallization of secondary gypsum, ettringite and the like, refine the aperture of the concrete, greatly improve the comprehensive efficiency of the concrete, prolong the service life of the concrete and strengthen the safety of concrete engineering. Meanwhile, the invention uses barium chloride, barium hydroxide and barium nitrate in a compound way, effectively solidifies sulfate ions which invade the interior of the concrete, thereby forming barium sulfate crystals and filling microcracks in the interior of the concrete, greatly improving the sulfate erosion resistance of the concrete, and the preferable proportion of each component of barium salt has stronger adsorption effect on the sulfate ions and remarkably improves the sulfate erosion resistance of the concrete. The fly ash, limestone powder, mineral powder and high-sulfur tailing which are selected as the high-sulfur tailing cementing material are all industrial waste, so that the production cost is saved, the reutilization of the waste is realized, and the high-sulfur tailing cementing material has great significance in protecting the ecological environment.
The fly ash is a substance taking active silicon dioxide, active aluminum oxide and active calcium oxide as main components, and can convert calcium hydroxide which is unfavorable for concrete into favorable C-S-H gel (pozzolanic effect), namely, the glass-state active silicon oxide and aluminum oxide in the fly ash react with calcium hydroxide in cement to generate hydrated calcium silicate and hydrated calcium aluminate, so that gaps of the cement are filled, on one hand, the strength and compactness of the concrete are improved, the impermeability is improved, and on the other hand, ca (OH) is weakened 2 The expansion of the crystals is damaging to the concrete.
The high-sulfur tailing not only has certain gelation effect on concrete, but also can fully utilize the characteristic of smaller particle size to uniformly fill the gaps among aggregates, so that the internal framework of the concrete is more compact.
The mineral powder is a substance which is finely ground to a certain fineness requirement after being quenched by blast furnace waste residues of a steel mill, takes calcium oxide and aluminum oxide as main components, has good morphological effect, micro-aggregate effect and pozzolanic 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 interface pores of the concrete, so that the concrete structure is more compact.
The limestone powder has filling and dispersing effects in concrete, and can improve the workability and water retention of fresh concrete and the excellent properties of impermeability, durability and the like of hardened concrete by optimizing the grain composition. In addition, calcium hydroxide can be deposited on limestone powder, so that a crystal nucleus effect is achieved, hydration of cement particles is accelerated, early strength of concrete is improved, and sulfate erosion resistance of the concrete is improved.
Although the addition of the high-sulfur tailings can introduce sulfides, the corrosion reaction of the formula (1), the formula (2) and the formula (3) occurs, and the expansive products such as ettringite, secondary gypsum and the like are generated, so that micro cracks are generated and expanded, the structure is loose, and the service performance of the concrete is deteriorated. However, the inventor can fix sulfate ions which invade a concrete pore network in the form of barium sulfate by adding a certain amount of barium salt, modified bentonite, activated alumina and an exciting agent into the high-sulfur tailing cementing material, and the amount of the sulfate ions is obviously reduced although ettringite is still generated. The reason is probably that the reactions of the formulas (3) and (4) simultaneously occur in the concrete, and the solubility of barium sulfate is lower than that of calcium sulfate, SO that SO invades the concrete 4 2- Priority and Ba 2+ The ion reaction generates barium sulfate, and SO is consumed by the generation of the barium sulfate 4 2- At the same time, the sediment fills the capillary holes of the concrete, thereby reducing SO 4 2- The erosion rate of (c) hinders the formation and accumulation of the swelling ettringite. The specific reaction process is as follows:
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 silicate cement with a density of 3.06g/cm 3 ～3.12g/cm 3 。
Optionally, the fly ash is secondary fly ash.
Optionally, the grain size of the high-sulfur tailing is 10-75 μm.
Optionally, the specific surface area of the mineral 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 tailing, the mineral powder and the limestone powder plays a strong pozzolanic activity and filling effect in a cementing system, effectively improves the microstructure of concrete, forms a firm concrete supporting structure and remarkably 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 and cohesiveness.
Optionally, the specific surface area of the activated alumina is 409.03m 2 /g～440.10m 2 /g。
The preferable activated alumina can promote the substances in the cement to react with the substances to generate ettringite very rapidly, reduce the content of calcium hydroxide and accelerate C 3 S, hydration, so that the strength of the concrete is further improved; meanwhile, the modified bentonite has a synergistic effect with barium salt, modified bentonite and an exciting agent, and when the modified bentonite is mixed in a proper proportion, the compactness and strength of the concrete can be improved, and the service life of the concrete is prolonged.
Optionally, the activator is sodium hydroxide.
Optionally, the preparation method of the modified bentonite comprises the following steps: activating bentonite at 500-550 deg.c for 2.5-3.0 hr, and mixing with calcium oxide in 3.2-3.3: mixing at a mass ratio of 1-1.1, and grinding until the specific surface area reaches 340m 2 /Kg～370m 2 And (3) Kg to obtain the modified bentonite.
The optimized modified bentonite is fully activated by roasting and grinding with calcium oxide, has larger interlayer spacing and specific surface area, enhances adsorption effect, can effectively adsorb sulfate ions, and montmorillonite in the bentonite can participate in hydration reaction of cement and interweave with ettringite to form a more compact structure, so that fewer pores are generated, and the mechanical property of the cementing material is improved. Meanwhile, the modified bentonite and the exciting agent 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 mineral powder is realized, the compactness and the erosion resistance of the material are synergistically improved, the water absorption and water retention effects are good, the hydration environment required by the cementing material is maintained, and the improvement of the later strength of the concrete is ensured.
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 exciting agent according to the weight ratio, and grinding to obtain the material with the specific surface area of 400m 2 /Kg～450m 2 Powder of/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.
In a third aspect, the invention provides high-sulfur tailing concrete, which comprises 400-500 parts of the 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 reducer.
Compared with the prior art, the high-sulfur tailing concrete provided by the invention can form a cementing structure system almost without pores through the interaction of coarse aggregate, fine aggregate, high-sulfur tailing cementing material and water reducing agent, so that the strength of the concrete is greatly enhanced, the internal structures of the concrete are mutually adhered and are not easy to separate, the high-sulfur tailing concrete has better working performance compared with common concrete, the slump of the concrete can reach 235mm, the diffusivity can reach 575mm, and the 28d compressive strength can reach 62.2MPa. Meanwhile, the invention applies the high-sulfur tailing as an admixture to the preparation of concrete, realizes the secondary utilization of the solid waste of the tailing, can reduce the cement consumption of single concrete, solves the problem of insufficient supply of I and II-grade fly ash, reduces the cost of single concrete by 6-10 percent, avoids the phenomenon of low concrete strength caused by the high-sulfur tailing as a cementing filling aggregate, and has important significance for the sustainable development of construction of green mines and mineral resources.
Optionally, the coarse aggregate is continuous graded broken stone with the grain diameter 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 River sand of (2).
The preferable coarse aggregate, fine aggregate and high-sulfur tailing can effectively form grading, which is helpful for improving the bearing performance of the whole concrete, ensuring that the whole concrete structure is compact and has hard texture, and being helpful for improving the compressive strength of the concrete.
Optionally, the water reducer is a polycarboxylate water reducer, the solid content is 35% -40%, and the water reducing rate is 31% -32.1%.
The optimized water reducing agent is favorable 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 tail sand 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 (3) mixing and stirring the prepared materials, 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 reducer, 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 time of the first mixing and stirring is 1 min-2 min, and the time of the second mixing and stirring is 3 min-4 min.
The preferable mode of stirring for several times can lead 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, the impermeability and the erosion resistance of the concrete, greatly reduce the risk of cracking the concrete and improve the strength of the concrete.
In summary, the high-sulfur tailing cementing material, as well as the preparation method and the application thereof, provided by the invention have the following beneficial effects:
(1) The invention mixes fly ash, high sulfur tailing, mineral powder and limestone powder into the high sulfur tailing concrete, plays a strong pozzolan activity and filling effect, effectively improves the microstructure of the concrete, forms a cementing structure system with almost no pores, obviously enhances the mechanical property of the concrete, greatly reduces the risk of early cracking of the concrete, effectively cures sulfate ions invading the inside of the concrete through the synergistic effect of barium salt, modified bentonite, activated alumina and an exciting agent, greatly improves the sulfate erosion resistance of the concrete, improves the compactness and strength of the concrete, and further prolongs the service life of the concrete.
(2) The preparation method of the high-sulfur tailing cementing material provided by the invention has the advantages that the material processing and production process are simple, and a large amount of industrial wastes such as fly ash, limestone powder, mineral powder and high-sulfur tailing are utilized, and the fly ash, limestone powder, mineral powder and high-sulfur tailing selected by the high-sulfur tailing cementing material are all industrial wastes, so that the production cost is saved, the cement consumption in concrete can be reduced, the reutilization of wastes is realized, and the high-sulfur tailing cementing material has remarkable economic benefit, social benefit and environmental protection benefit.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of 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 exciting agent.
Wherein, the barium salt comprises the following components in percentage by mass: 2.1:2.0, barium chloride, barium hydroxide and barium nitrate; the fly ash is secondary fly ash; the grain diameter of the high sulfur tailing is 10-75 mu m; the specific surface area of the mineral powder is 400m 2 /Kg～450m 2 Kg; specific surface area of limestone powder is more than 700m 2 Kg; the specific surface area of the activated alumina is 409.03m 2 /g～440.10m 2 /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 and then reacted with calcium oxide at 3.3:1, and grinding until the specific surface area reaches 340m 2 /Kg～370m 2 And (3) 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 exciting agent according to the weight ratio, and grinding to obtain the powder with the specific surface area of 400m 2 /Kg～450m 2 Powder of/Kg;
(2) And uniformly mixing the powder with cement, fly ash, high-sulfur tailing, 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 mass ratio of the barium salt is 1.5:2.5:2.4 mixtures of barium chloride, barium hydroxide and barium nitrate; the fly ash is secondary fly ash; the grain diameter of the high sulfur tailing is 10-75 mu m; the specific surface area of the mineral powder is 400m 2 /Kg～450m 2 Kg; specific surface area of limestone powder is more than 700m 2 Kg; the specific surface area of the activated alumina is 409.03m 2 /g～440.10m 2 /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 and then reacted with calcium oxide at 3.2:1.1, and grinding to obtain powderThe specific surface area reaches 340m 2 /Kg～370m 2 And (3) 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 exciting agent according to the weight ratio, and grinding to obtain the powder with the specific surface area of 400m 2 /Kg～450m 2 Powder of/Kg;
(2) And uniformly mixing the powder with cement, fly ash, high-sulfur tailing, 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 material components 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 mass ratio of the barium salt is 1.3:2.3:2.2 mixtures of barium chloride, barium hydroxide and barium nitrate; the fly ash is secondary fly ash; the grain diameter of the high sulfur tailing is 10-75 mu m; the specific surface area of the mineral powder is 400m 2 /Kg～450m 2 Kg; specific surface area of limestone powder is more than 700m 2 Kg; the specific surface area of the activated alumina is 409.03m 2 /Kg～440.10m 2 /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 reacted with calcium oxide at 3.3:1.1, and grinding until the specific surface area reaches 340m 2 /Kg～370m 2 And (3) 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 exciting agent according to the weight ratio, and grinding to obtain the powder with the specific surface area of 400m 2 /Kg～450m 2 Powder of/Kg;
(2) And uniformly mixing the powder with cement, fly ash, high-sulfur tailing, mineral powder, limestone powder, barium salt and activated alumina to obtain the high-sulfur tailing cementing material.
Example 4
The embodiment provides high-sulfur tail sand concrete which comprises the following raw material components in parts by weight: 400 parts of the 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 reducer.
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 River sand of (2); the water reducer is a polycarboxylate water reducer.
The embodiment also provides a preparation method of the high-sulfur tail sand concrete, which comprises the following process steps:
(1) Uniformly mixing coarse aggregate and fine aggregate according to the weight ratio to obtain a prepared material;
(2) Mixing and stirring the prepared materials, the high-sulfur tailing cementing material and water for 1min at the rotating speed of 300r/min, standing for 30s, adding a water reducing agent, and mixing and stirring for 3min at the rotating speed of 300r/min again to obtain the high-sulfur tailing concrete.
Example 5
The embodiment provides high-sulfur tail sand concrete which comprises the following raw material components in parts by weight: 500 parts of the 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 reducer.
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 River sand of (2); the water reducer is a polycarboxylate water reducer.
The embodiment also provides a preparation method of the high-sulfur tail sand concrete, which comprises the following process steps:
(1) Uniformly mixing coarse aggregate and fine aggregate according to the weight ratio to obtain a prepared material;
(2) Mixing and stirring the prepared materials, the high-sulfur tailing cementing material and water for 2min at the rotating speed of 350r/min, standing for 60s, adding a water reducing agent, and mixing and stirring for 4min at the rotating speed of 350r/min again to obtain the high-sulfur tailing concrete.
Example 6
The embodiment provides high-sulfur tail sand 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 reducer.
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 River sand of (2); the water reducer is a polycarboxylate water reducer.
The embodiment also provides a preparation method of the high-sulfur tail sand concrete, which comprises the following process steps:
(1) Uniformly mixing coarse aggregate and fine aggregate according to the weight ratio to obtain a prepared material;
(2) Mixing and stirring the prepared materials, the high-sulfur tailing cementing material and water for 1.5min at the rotating speed of 330r/min, standing for 45s, adding a water reducer, and mixing and stirring for 3.5min at the rotating speed of 320r/min to obtain the high-sulfur tailing concrete.
Comparative example 1
This comparative example provides a high sulfur tail sand concrete, which has the same composition and preparation method as in example 4, except that: the addition amount of the barium salt in 1 part of the high-sulfur tailing cementing material is 18 parts.
Comparative example 2
This comparative example provides a high sulfur tail sand concrete, which has the same composition and preparation method as in example 4, except that: the barium salt comprises the following components in percentage by mass: 6:2.0 barium chloride, barium hydroxide and barium nitrate.
Comparative example 3
This comparative example provides a high sulfur tail sand concrete, which has the same composition and preparation method as in example 4, except that: the modified bentonite is replaced by kaolin.
In order to demonstrate the effect of the high-sulfur tailing concrete prepared in the examples and comparative examples of the present invention, the high-sulfur tailing concrete in examples 4 to 6 and comparative examples 1 to 3 was examined according to the national standard method, and the examination results are shown in the following table:
table 1 experimental results of concrete Performance test
As can be seen from the table, the high-sulfur tailing concrete provided by the invention has the advantages that the compactness and strength are obviously increased after the high-sulfur tailing cementing material is added, the sulfate erosion resistance is effectively improved, the fluidity and slump retention are good, the purposes of improving the safety and 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 low due to the fact that the high-sulfur tailing is used as the cementing filling aggregate is solved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (9)
1. The high-sulfur tailing cementing material is characterized in that: the material comprises the following raw materials in parts by weight: 200-220 parts of cement, 70-90 parts of fly ash, 40-60 parts of high-sulfur tailing, 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 exciting agent; wherein the barium salt comprises the following components in percentage by mass of 1.2-1.5: 2.1 to 2.5:2.0 to 2.4 of barium chloride, barium hydroxide and barium nitrate;
the preparation method of the modified bentonite comprises the following steps: activating bentonite at 500-550 deg.c for 2.5-3.0 hr, and mixing with calcium oxide in 3.2-3.3: mixing at a mass ratio of 1-1.1, and grinding until the specific surface area reaches 340m 2 /Kg～370m 2 And (3) Kg to obtain the modified bentonite.
2. The high sulfur tail cement according to claim 1, wherein: the fly ash is secondary fly ash; and/or
The grain diameter of the high-sulfur tailing 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 tail cement according to claim 1, wherein: the specific surface area of the limestone powder is more than 700m 2 Kg; and/or
The specific surface area of the activated alumina is 409.03m 2 /g～440.10m 2 /g; and/or
The excitant is sodium hydroxide.
4. A method for preparing the high-sulfur tailing cementing material according to any one of claims 1 to 3, which is characterized in that: the method comprises the following steps:
(1) Mixing the modified bentonite and the exciting agent according to the weight ratio, and grinding to obtain the material with the specific surface area of 400m 2 /Kg～450m 2 Powder of/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.
5. A high sulfur tail sand concrete is characterized in that: a high sulfur tailing cement as claimed in any one of claims 1 to 3.
6. The high sulfur tail sand concrete of claim 5, wherein: the high-sulfur tail sand 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 reducer.
7. The high sulfur tail sand concrete of claim 6, wherein: the coarse aggregate is continuous graded broken stone with the grain diameter of 5-20 mm; and/or
The fine aggregate is the fineness modulusIs 2.7 to 3.0, and the apparent density is 2520kg/m 3 ～2620kg/m 3 River sand of (2); and/or
The water reducer is a polycarboxylate water reducer.
8. The method for preparing high sulfur tail sand concrete according to claim 6 or 7, 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 (3) mixing and stirring the prepared materials, 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 reducer, and mixing and stirring for the second time at the rotating speed of 300-350 r/min to obtain the high-sulfur tailing concrete.
9. The method for preparing high sulfur tail sand concrete according to claim 8, wherein: in the step (2), the time of the first mixing and stirring is 1-2 min, and the time of the second mixing and stirring is 3-4 min.
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