CN114455890B - Mineralized red mud aggregate water permeable brick and preparation method thereof - Google Patents
Mineralized red mud aggregate water permeable brick and preparation method 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0003—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof containing continuous channels, e.g. of the "dead-end" type or obtained by pushing bars in the green ceramic product
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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
- C04B2111/2038—Resistance against physical degradation
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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
- C04B2111/40—Porous or lightweight materials
-
- 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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- 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 relates to a mineralized red mud aggregate water permeable brick and a preparation method thereof, wherein three powders of red mud, tailing sand and steel slag are firstly taken and mixed uniformly, then water is added for granulating, the obtained particles are mineralized in carbon dioxide atmosphere, and the mineralized particles are refilled in a porous mould; soaking the porous mold in slurry formed by mixing steel slag powder, retarder and water, taking out the porous mold after the slurry is wrapped on the surface of mineralized particles, discharging the slurry capable of flowing in the porous mold, then placing the slurry into carbon dioxide atmosphere for pre-mineralization, and demolding to obtain the shaped brick; mineralizing the shaped brick in carbon dioxide atmosphere to obtain the water permeable brick. The invention uses the solid waste red mud and steel slag in metallurgical industry as raw materials, cement and other cementing materials are not needed to be added, the utilization rate of the solid waste is high, and the strength of the obtained water permeable brick reaches the standard, and the water permeable effect is good.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a mineralized red mud aggregate water permeable brick and a preparation method thereof.
Background
Under the concept of building a 'sponge city', the water permeable bricks are widely used and occupy a certain market position. The existing water permeable bricks are classified into sintered bricks and baking-free bricks, the sintered bricks have good performance, but the high-temperature firing has the problems of high energy consumption, environmental pollution caused by kiln technology and the like, so the baking-free bricks without being calcined gradually become products with wide development prospects.
The baking-free bricks mostly use cement, waste ceramics, fly ash and the like as raw materials, but cement and the like are needed to be used as cementing materials, so that the cost is high.
The red mud is a solid waste material remained after the alumina is prepared, and huge red mud discharge and stockpiling quantity exist at present in China, but the red mud is difficult to apply due to high alkalinity and complex impurities.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a mineralized red mud aggregate water permeable brick and a preparation method thereof, wherein solid waste red mud is effectively utilized as a raw material, cementing materials such as cement and the like are not required to be added, and the water permeable brick is produced at normal temperature.
In order to achieve the technical purpose, the water permeable brick has the technical scheme that:
the method comprises the following steps:
step one: mixing three powders of red mud, tailing sand and steel slag uniformly, adding water for granulating, mineralizing the obtained particles in carbon dioxide atmosphere, and refilling the mineralized particles into a porous die;
step two: soaking the porous mold in slurry formed by mixing steel slag powder, retarder and water, taking out the porous mold after the slurry is wrapped on the surface of mineralized particles, discharging the slurry capable of flowing in the porous mold, then placing the slurry into carbon dioxide atmosphere for pre-mineralization, and demolding to obtain the shaped brick;
step three: mineralizing the shaped brick in carbon dioxide atmosphere to obtain the water permeable brick.
Further, the red mud is one or a mixture of two of sintering red mud and Bayer red mud in any proportion, the water content of the red mud is required to be less than 20%, and the fineness of the red mud is less than 100 meshes; the steel slag and the steel slag powder are converter steel slag or electric furnace steel slag, and the fineness is less than or equal to 100 meshes; the tailing sand is one or more of gold tailing sand, iron tailing sand or high-iron bauxite tailings, and the fineness is 100-200 meshes.
In the first step, the tailing sand accounts for 20-30% of the mass of the steel slag, the red mud accounts for 35-50% of the total mass of the tailing sand and the steel slag, and water accounting for 15-25% of the total mass of the three powders is added for mixing.
Further, the granules with the particle size value of 8-15 mm are obtained by granulating in the first step.
Further, in the slurry obtained in the second step, water accounts for 40-50% of the mass of the steel slag powder; the addition amount of the retarder is 0.02-0.1% of the mass of the steel slag powder.
Further, the retarder is sodium gluconate, salicylic acid or citric acid.
Further, the pore diameter of the porous mold is 3-5 mm, and the pore density is 9500-12000/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The porous mould is provided with a cover plate; the porous mold and the cover plate are coated with release agent.
Further, the soaking time in the second step is 20-60 s.
Further, in the mineralization and pre-mineralization processes, the concentration of the carbon dioxide atmosphere is not lower than 10%, and the mineralization gas pressure is 0.1-1.0 Mpa; the mineralization time is 10-24 hours, and the pre-mineralization time is 20-30 minutes.
The mineralized red mud aggregate water permeable brick prepared by the preparation method is provided.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, three powders of red mud, tailing sand and steel slag are uniformly mixed and granulated, the formed aggregate is simple in ingredients, the forming operation is convenient, the strength forming period is short, and the obtained water permeable brick can reach higher strength in tens of hours to twenty hours through specific conditions such as twice mineralization, once pre-mineralization and the like;
2. the invention realizes the purposes of bonding the inside of the brick body and having strength under specific conditions by the action of the added steel slag during granulation and the steel slag powder in the soaking slurry;
3. the invention uses the solid waste red mud and steel slag in metallurgical industry as raw materials, cement and other cementing materials are not needed to be added, and the utilization rate of the solid waste is high, thereby being environment-friendly; the water permeable brick is produced at normal temperature without high-temperature sintering in the molding process, and the energy consumption is low; the absorption of carbon dioxide in the mineralization reaction process of the granular aggregate and the brick body accords with the national 'double carbon' strategy, so that the carbon dioxide emission is reduced, and the resource saving and utilization are realized; the method provides a solution to red mud for aluminum production enterprises, responds to national carbon neutralization guidelines and promotes the green development of public society;
4. the mineralized red mud aggregate water permeable brick produced by the invention has good water permeable effect (the water permeable coefficient is more than 2.0 multiplied by 10) -2 cm/s), the strength reaches the standard, the cost is low, and the water permeable brick is applied to pavement and square pavement needing water permeable bricks, thereby bringing good economic 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.
The invention can solve the problem of red mud accumulation and provides a novel environment-friendly permeable brick molding process, which specifically comprises the following steps:
crushing, screening, grinding and selecting the red mud, the tailing sand and the steel slag to obtain material powder with certain particle size fineness, uniformly mixing, adding a proper amount of water, preparing particles with a set particle size through a granulator device, then placing the particles in a carbon dioxide atmosphere with a certain concentration range for mineralization for a period of time, and tightly filling the treated particles in a porous die with a cover plate; soaking the mould filled with the particles in slurry mixed by steel slag powder, retarder and water, wrapping the slurry on the surfaces of the particles by utilizing the characteristics of red mud, taking out the mould filled with the particles, discharging superfluous slurry in the mould, placing the soaked mould in carbon dioxide atmosphere with a certain concentration range for short time to pre-mineralize, and demoulding to obtain the shaped brick after certain strength is achieved; mineralizing the shaped brick body for a period of time in a carbon dioxide atmosphere with a certain concentration to obtain the water permeable brick.
Preferably, the red mud is industrial waste discharged from alumina refining, is one or more of sintering process red mud or Bayer process red mud, and has water content of less than 20% and fineness of less than 100 meshes; the steel slag is converter steel slag or electric furnace steel slag, and the fineness of the powder required after grinding, selecting and screening is less than or equal to 100 meshes; preferably, the tailing sand is one or more of gold tailing sand, iron tailing sand or high-iron bauxite tailings, and the fineness requirement is 100-200 meshes. The fineness is favorable for strength generation in the mineralization process of the finished aggregate or brick body, and ensures that the intensity of the mineralized finished product is high.
Preferably, the mixture ratio of the granulating materials of the granulator is as follows: the tailing sand accounts for 20-30% of the mass of the steel slag powder, the red mud accounts for 35-50% of the total mass of the tailing sand and the steel slag, and water accounting for 15-25% of the total mass of the three powder bodies is added for mixing, so that the solid waste can be utilized to the maximum extent while the strength of a finished product is ensured by using the proportion.
Preferably, the particle size of the granulated particles of the granulator ranges from 8mm to 15mm.
Preferably, the water in the steel slag powder slurry accounts for 40-50% of the total mass of the steel slag powder, the retarder is one of sodium gluconate, salicylic acid and citric acid, and the mixing amount is 0.02% -0.1% of the mass of the steel slag powder.
Preferably, the mineralized particles are placed in a mould with a porous structure of a cover plate, the mould and the cover plate are coated with a release agent, the release agent is silicone oil, the inner dimension of the mould (the forming dimension of the water permeable brick) is 200mm multiplied by 100mm multiplied by 60mm, the aperture is 3-5 mm, and the aperture density is 9500-12000/m 2 The method comprises the steps of carrying out a first treatment on the surface of the In order to ensure that the surfaces of the material particles are fully wrapped by the steel slag slurry, the whole die is put into the steel slag slurry in a stirring state to be soaked for 20-60 s. According to the invention, the mould is filled with the granular materials, so that the supporting strength is acted by mineralizing the steel slag slurry.
Preferably, the mold after the slurry is soaked is fished out and then is kept stand or is filled with gas to accelerate the discharge of the slurry. The slurry is coated on the surface of the particles and is also used as a connecting material of each particle, the more the slurry is, the better the material strength is, but too much slurry can cause the blockage of a water permeable channel and affect the water permeable effect, so that the slurry which can flow in a soaked die is only soaked for 20-60 s and discharged.
Preferably, the soaked clothes are packedCO in the mould pre-mineralization process with material 2 The minimum concentration is required to be 10%, the mineralized gas pressure is between 0.1 and 1.0Mpa, and the mineralized time is 20 to 30min; CO during particle mineralization and final brick mineralization 2 The concentration is required to be 10% of the minimum concentration, the mineralized gas pressure is between 0.1 and 1.0Mpa, and the mineralization time is between 10 and 24 hours.
Example 1
(1) Crushing, grinding and selecting red mud, quartz tailings and steel slag, sieving with a 100-mesh sieve, mixing, wherein 100kg of steel slag powder, 30kg of tailing sand, 52kg of red mud and 36.4kg of water are mixed according to mass, namely, the tailing sand accounts for 30% of the mass of the steel slag powder, the red mud accounts for 40% of the total mass of the tailing sand and the steel slag powder, adding water accounting for 20% of the total mass of three powder bodies, stirring, and granulating in a granulator to obtain aggregate particles with the particle size of 8-12 mm.
(2) The granules were put into a 50% strength carbon dioxide atmosphere and mineralized for 10 hours to obtain aggregate granules having strength, which were filled into a mold.
(3) Taking 100kg of steel slag, 50kg of water and 0.02kg of retarder sodium gluconate by mass, namely adding 50% of water and 0.02% of retarder by mass of the steel slag into the steel slag to prepare slurry, immersing the whole die with particles into the stirred dynamic slurry, taking out after 50 seconds, and standing to enable the redundant slurry to flow out.
(4) And (5) putting the soaked mould into a carbon dioxide atmosphere with the concentration of 50% to mineralize for 20 minutes, and demoulding to obtain the shaped brick body.
(5) And then the shaped brick body is put into a carbon dioxide atmosphere with the concentration of 50 percent to be mineralized for 10 hours, and the water permeable brick can be obtained after being taken out.
Example 2
(1) Crushing, grinding and selecting red mud, iron tailings and steel slag, sieving with a 150-mesh sieve, mixing, wherein 100kg of steel slag powder, 25kg of tailings sand, 43.7kg of red mud and 28.7kg of water are mixed according to mass, namely, the tailings sand accounts for 25% of the mass of the steel slag powder, the red mud accounts for 35% of the total mass of the tailings sand and the steel slag powder, adding 17% of the total mass of water, stirring, and granulating in a granulator to obtain aggregate particles with the particle size of 10-12 mm.
(2) The granules were put into a carbon dioxide atmosphere having a concentration of 20% and mineralized for 24 hours to obtain aggregate granules having strength, which were filled into a mold.
(3) Taking 100kg of steel slag, 45kg of water and 0.01kg of retarder sodium gluconate by mass, namely adding 45% of water and 0.01% of retarder by mass into the steel slag to prepare slurry, immersing the whole die with particles into the stirred dynamic slurry for 30 seconds, taking out, and standing to enable the redundant slurry to flow out.
(4) And (5) putting the soaked mould into a carbon dioxide atmosphere with the concentration of 20% to mineralize for 0.5 hour, and demoulding to obtain the shaped brick body.
(5) And then the shaped brick body is put into a carbon dioxide atmosphere with the concentration of 20 percent to be mineralized for 24 hours, and the water permeable brick can be obtained after being taken out.
Example 3
(1) Crushing, grinding and selecting red mud, iron tailings and steel slag, sieving with a 200-mesh sieve, mixing, wherein the weight is 100kg of steel slag powder, 20kg of tailings sand, 60kg of red mud and 27kg of water, namely, the tailings sand accounts for 20% of the weight of the steel slag powder, the red mud accounts for 50% of the total weight of the tailings sand and the steel slag powder, adding 15% of the total weight of water, stirring, granulating in a granulator, and preparing aggregate particles with the particle size of 8-15 mm.
(2) The granules were mineralized in a carbon dioxide atmosphere having a concentration of 70% for 15 hours to obtain aggregate granules having strength, which were filled into a mold.
(3) Taking 100kg of steel slag, 45kg of water and 0.02kg of retarder salicylic acid according to mass, namely adding 45% of water and 0.02% of retarder according to mass percent into the steel slag to prepare slurry, immersing the whole die with particles into the stirred dynamic slurry, taking out after 60 seconds, and standing to enable the redundant slurry to flow out.
(4) And (5) putting the soaked mould into a carbon dioxide atmosphere with the concentration of 70% to mineralize for 20 minutes, and demoulding to obtain the shaped brick body.
(5) And then the shaped brick body is put into a carbon dioxide atmosphere with the concentration of 70 percent to be mineralized for 15 hours, and the water permeable brick can be obtained after being taken out.
Example 4
(1) Crushing, grinding and selecting red mud, gold tailing sand and steel slag, sieving with a 200-mesh sieve, mixing, wherein 100kg of steel slag powder, 25kg of tailing sand, 43.7kg of red mud and 33.7kg of water are mixed according to mass, namely, the tailing sand accounts for 25% of the mass of the steel slag powder, the red mud accounts for 35% of the total mass of the tailing sand and the steel slag powder, adding 20% of the total mass of water, stirring, and granulating in a granulator to obtain aggregate particles with the particle size of 8-15 mm.
(2) The granules were put into a carbon dioxide atmosphere having a concentration of 80% and mineralized for 12 hours to obtain aggregate granules having strength, which were filled into a mold.
(3) Taking 100kg of steel slag, 50kg of water and 0.02kg of retarder citric acid according to mass, namely adding 50% of water and 0.02% of retarder in total mass of the steel slag to prepare slurry, immersing the whole die with particles into the stirred dynamic slurry for 40 seconds, fishing out, and standing to enable the redundant slurry to flow out.
(4) And (5) putting the soaked mould into a carbon dioxide atmosphere with the concentration of 80%, mineralizing for 20 minutes, and demoulding to obtain the shaped brick body.
(5) And then the shaped brick body is put into a carbon dioxide atmosphere with the concentration of 80 percent to be mineralized for 12 hours, and the water permeable brick can be obtained after being taken out.
2. Performance test is carried out on the red mud aggregate water permeable bricks prepared by the embodiment
Split tensile strength test: the split tensile strength test is carried out by referring to the national standard of permeable pavement bricks and permeable pavement boards (GB/T25993-2010), and the average value is required to be more than or equal to 3.0MPa.
And (3) water permeability coefficient test: the water permeability coefficient test is carried out by referring to the national standard of water permeable pavement bricks and water permeable pavement boards (GB/T25993-2010), and the water permeability grade A is required to be more than or equal to 2.0 multiplied by 10 -2 cm/s。
Abrasion resistance: the abrasion resistance test is carried out by referring to the national standard of permeable pavement bricks and permeable pavement boards (GB/T25993-2010), and the abrasion pit length is required to be not more than 35mm.
Example manufacture the test results of the split tensile strength, water permeability coefficient and wear resistance test of the water permeable bricks and the common pavement water permeable bricks are compared as shown in the following table 1.
Wherein the common pavement water permeable brick is prepared from common broken stone, cement, water and river sand; the dimensions were 200mm by 100mm by 60mm, and the applicant's commercial product PCB-A200mm by 100mm by 60mm N fts3.0 was used.
Table 1 example test results table
| Examples | Split tensile strength | Permeability coefficient (cm/s) | Wear resistance (grinding pit length mm) |
| Example 1 | 3.5 | 2.45×10 -2 | 23 |
| Example 2 | 3.6 | 2.56×10 -2 | 23 |
| Example 3 | 3.8 | 2.50×10 -2 | 22 |
| Example 4 | 4.0 | 2.67×10 -2 | 20 |
| Permeable pavement brick | 3.5 | 2.30×10 -2 | 25 |
From this, it is proved that the water permeable performance, the wear resistance and the splitting tensile strength of the water permeable brick of the product all meet the standard requirements.
Comparative example 1
And (5) examining the influence of different raw materials on the performance of the obtained water permeable bricks.
The steel slag in the granulating process is replaced by equivalent fly ash and thiourea filter residues, and the other conditions are the same as those in the first embodiment, and the obtained water permeable bricks are respectively numbered as a comparative sample 1-1 and a comparative sample 1-2, and the results are shown in the following table 2 after testing.
Table 2 comparative example 1 and comparative example test results table
| Sample numbering | Split tensile strength | Permeability coefficient (cm/s) | Wear resistance (grinding pit length mm) |
| Comparative sample 1-1 | 2.2 | 1.75×10 -2 | 30 |
| Comparative examples 1 to 2 | 2.0 | 1.60×10 -2 | 35 |
| Example 1 | 3.5 | 2.45×10 -2 | 23 |
The test result shows that the strength of the product is that the filling particles play a role in the skeleton, and the steel slag slurry plays a role in strength supplement and connection; the strength of the particles is derived from the effect of steel slag, the mineralization effect of the fly ash and thiourea filter residues is very poor, gaps are filled by broken particles, the strength requirement can not be met when the raw materials are replaced, and the strength and the wear resistance can be drastically reduced.
Comparative example 2
And (5) observing the influence of different processes on the performance of the obtained water permeable bricks.
The steps of mineralizing particles were omitted, the pre-mineralizing step was omitted, and the setting brick mineralizing time was adjusted to 1h, and the other conditions were the same as in example one, and the obtained water permeable bricks were numbered as comparative sample 2-1, comparative sample 2-2, and comparative sample 2-3, respectively.
The results are shown in Table 3 below.
Table 3 comparative example 2 and comparative example test results table
| Sample numbering | Split tensile strength | Permeability coefficient (cm/s) | Wear resistance (grinding pit)Length mm) |
| Comparative sample 2-1 | 3.2 | 1.53×10 -2 | 25 |
| Comparative sample 2-2 | 2.5 | 2.39×10 -2 | 23 |
| Comparative samples 2 to 3 | 2.8 | 2.40×10 -2 | 27 |
| Example 1 | 3.5 | 2.45×10 -2 | 23 |
As shown by test results, the comparative sample 2-1 has insufficient particle strength because the particle is not subjected to a mineralization process after granulation, and is easy to deform and collapse in the slurry soaking process, so that the water permeable gap of the final water permeable brick is reduced, the water permeable coefficient is obviously reduced, and the influence on the overall mineralization strength of the particles is small in later mineralization; the comparative sample 2-2 is not subjected to the pre-mineralization step, so that slurry is not completely dried and hanging materials are insufficient, and the obtained water permeable brick is not smooth in appearance and not high in strength; in the comparative sample 2-3, the mineralization of the steel slag layer coated on the surface of the particles is incomplete due to the short time of the final mineralization process, but the mineralization of the particles is complete, so that the strength is reduced compared with that of the embodiment, and the water permeability is not greatly changed.
The mineralized red mud aggregate water permeable brick provided by the invention takes various solid wastes such as red mud and steel slag as raw materials, and takes mineralization reaction to obtain strength by utilizing industrial waste gas atmosphere such as carbon dioxide, namely belongs to the technical process of baking-free water permeable bricks, and also solves the stacking problem of the red mud, so that a red mud solution is provided for aluminum-making enterprises, the national carbon neutralization guidelines are responded, and the green development of public society is promoted. The utilization rate of the solid waste is high; the preparation method has the advantages of simple mixing treatment method, simple preparation steps and excellent product performance, can be applied to pavements and squares with water permeability requirements, and has environmental protection benefit and economic benefit.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (7)
1. A preparation method of mineralized red mud aggregate water permeable bricks is characterized by comprising the following steps: the method comprises the following steps:
step one: mixing three powders of red mud, tailing sand and steel slag uniformly, adding water for granulating, mineralizing the obtained particles in carbon dioxide atmosphere, and refilling the mineralized particles into a porous die;
step two: soaking the porous mold in slurry formed by mixing steel slag powder, retarder and water, taking out the porous mold after the slurry is wrapped on the surface of mineralized particles, discharging the slurry capable of flowing in the porous mold, then placing the slurry into carbon dioxide atmosphere for pre-mineralization, and demolding to obtain the shaped brick;
step three: mineralizing the shaped brick in carbon dioxide atmosphere to obtain a permeable brick;
the red mud is one or a mixture of two of sintering red mud and Bayer red mud in any proportion, the water content of the red mud is required to be less than 20%, and the fineness of the red mud is less than 100 meshes; the steel slag and the steel slag powder are converter steel slag or electric furnace steel slag, and the fineness is less than or equal to 100 meshes; the tailing sand is one or more of gold tailing sand, iron tailing sand or high-iron bauxite tailings, and the fineness is 100-200 meshes; in the first step, the tailing sand accounts for 20-30% of the mass of the steel slag, the red mud accounts for 35-50% of the total mass of the tailing sand and the steel slag, and water accounting for 15-25% of the total mass of the three powders is added for mixing;
in the mineralization and pre-mineralization processes, the concentration of the carbon dioxide atmosphere is not lower than 10%, and the mineralization gas pressure is 0.1-1.0 MPa; the mineralization time is 10-24 hours, and the pre-mineralization time is 20-30 minutes.
2. The method for preparing the mineralized red mud aggregate water permeable brick according to claim 1, which is characterized by comprising the following steps: and in the first step, granulating to obtain granules with the particle size of 8-15 mm.
3. The method for preparing the mineralized red mud aggregate water permeable brick according to claim 1, which is characterized by comprising the following steps: in the slurry of the second step, water accounts for 40-50% of the mass of the steel slag powder; the addition amount of the retarder is 0.02-0.1% of the mass of the steel slag powder.
4. The method for preparing the mineralized red mud aggregate water permeable brick according to claim 1, which is characterized by comprising the following steps: the retarder is sodium gluconate, salicylic acid or citric acid.
5. The method for preparing the mineralized red mud aggregate water permeable brick according to claim 1, which is characterized by comprising the following steps: the pore diameter of the porous mold is 3-5 mm, and the pore density is 9500-12000/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The porous mould is provided with a cover plate; the porous mold and the cover plate are coated with release agent.
6. The method for preparing the mineralized red mud aggregate water permeable brick according to claim 1, which is characterized by comprising the following steps: and step two, soaking for 20-60 s.
7. The mineralized red mud aggregate water permeable brick prepared by the preparation method of claim 1.
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