CN115159953A - Method and system for dealkalizing and co-producing red mud-based building material from red mud - Google Patents

Method and system for dealkalizing and co-producing red mud-based building material from red mud Download PDF

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CN115159953A
CN115159953A CN202210955128.8A CN202210955128A CN115159953A CN 115159953 A CN115159953 A CN 115159953A CN 202210955128 A CN202210955128 A CN 202210955128A CN 115159953 A CN115159953 A CN 115159953A
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red mud
dealkalizing
building
coproducing
based building
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CN115159953B (en
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任常在
舒杰
李欢
赵玉晓
成望海
刘全勋
单光和
段彦飞
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Shandong Zhuolian Environmental Protection Technology Co ltd
Xintai Industrial Technology Research Institute Co ltd
Qilu University of Technology
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Shandong Zhuolian Environmental Protection Technology Co ltd
Xintai Industrial Technology Research Institute Co ltd
Qilu University of Technology
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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
    • C04B28/34—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 containing cold phosphate binders
    • C04B28/344—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 containing cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • 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
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00181—Mixtures specially adapted for three-dimensional printing (3DP), stereo-lithography or prototyping
    • 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
    • C04B2111/2023—Resistance against alkali-aggregate reaction
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a method and a system for dealkalizing red mud and co-producing red mud-based building materials, which can be used for recovering sodium acetate and potassium acetate by means of neutralizing NaOH and KOH in the red mud by industrial waste acid through filter pressing and evaporative crystallization, and mixing the red mud subjected to dealkalization with magnesium phosphate cement to prepare a large amount of building materials for building 3D printing, and meanwhile, recovering Na and K salts in the red mud to realize extraction and reutilization of solid waste resources. The method utilizes common industrial waste materials such as red mud, industrial wastewater and the like, the raw materials are low in acquisition price, wide in acquisition mode and large in existing quantity, and the output can be continuously used in the chemical industry and the building industry, so that the existing red mud stock can be consumed in a large quantity after a complete industrial chain is formed, and the red mud stock can be converted into available building resources.

Description

Method and system for dealkalizing and co-producing red mud-based building material from red mud
Technical Field
The invention relates to the fields of comprehensive utilization of resources of chemical industry and industrial solid wastes and environmental protection and treatment, in particular to a method and a system for dealkalizing red mud and co-producing red mud-based building materials.
Background
The red mud is waste residue with environmental pollution discharged in the aluminum industrial production, and 1-2t of red mud is generated every 1t of aluminum oxide is produced according to the existing aluminum oxide production process. At present, the red mud treatment mode is mainly stockpiling treatment, namely the red mud is constructed to be piled in a centralized way. The stacking mode comprises dry stacking and wet stacking, because the red mud production process causes a large amount of strong alkali, dealkalization treatment is required no matter the dry stacking or the wet stacking is carried out, generally, the alkali content is 30-400mg/L which is a proper range of a public water source, and the alkalinity of the red mud attached liquid is as high as 26000-28000mg/L. The main pollutants in red mud are from alkali and heavy metals, and the alkali in the red mud is mainly divided into soluble alkali and insoluble alkali.
The common red mud dealkalization treatment methods at present are a water dealkalization method, an acid dealkalization method, a lime dealkalization method and a salt dealkalization method. The water washing method is the simplest dealkalization method, does not consume other reagents, but only can remove soluble alkali in the dealkalization method, and has low efficiency. The acid dealkalization finally faces a problem of how to utilize leachate and waste materials, which otherwise is easy to cause secondary pollution. The lime dealkalization method is generally sintering by using lime, and has the main problems that the phase of red mud is too complex, and how to further improve the dealkalization rate needs to be solved. The salt dealkalization method has high efficiency but has the main problem that the final filtration effect is not good and the method cannot be widely applied in industry. Therefore, although a plurality of red mud dealkalization methods exist at present, the final post treatment is not good, so that the final practical application condition is not ideal. Meanwhile, resource utilization of the dealkalized red mud is also the basis for realizing green circulating operation of the electrolytic aluminum plant at present.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a system for dealkalizing and coproducing red mud-based building materials by red mud, wherein the red mud dealkalizing and coproducing red mud-based building 3D printing materials are carried out by acid-base neutralization-evaporative crystallization, naOH and KOH in the red mud are neutralized by industrial waste acid, sodium acetate and potassium acetate are recovered after filter pressing and evaporative crystallization, and the red mud after dealkalization treatment is mixed with magnesium phosphate cement to prepare a large amount of building materials for building 3D printing, thereby realizing the extraction and reutilization of solid waste resources.
In a first aspect, the invention provides a method for dealkalizing red mud and co-producing a red mud-based building material, which comprises the following steps:
(1) Putting the red mud and the industrial acidic wastewater into a homogenizing tank for mixing, adjusting to be neutral, preparing slurry, and heating and homogenizing;
(2) Filter-pressing and drying the homogenized material to obtain a mixed material;
(3) The mixed material and magnesium phosphate cement are proportioned and ground;
(4) And mixing the ground raw materials with an additive for coagulation to prepare the building 3D printing material with printing and building performances.
Further, in the step (1), the liquid-solid ratio of the slurry is 5-7:1.
further, in the step (1), the heating temperature is 50-70 ℃.
Further, in the step (3), in the mixture ratio of the mixed material and the magnesium phosphate cement, the mixed material is not higher than 8%.
Further, in the step (4), dust in the preparation process is treated by a dust remover to be used as a secondary raw material and returned to the building 3D printing material.
Further, in the step (2), press filtrate formed in the homogenization process is washed by water, and Na and K salts are obtained through high temperature, evaporation and crystallization.
Further, in the step (4), the coagulation time is 5-15min.
In a second aspect, the invention provides a system for dealkalizing and coproducing red mud-based building materials from red mud, which comprises a homogenizing pool, a filter press, a dryer and a pulverizer, wherein the homogenizing pool, the filter press, the dryer and the pulverizer are sequentially connected, the dryer is also connected with a hot water storage device, and the filter press is also connected with an evaporator.
And further, the device also comprises a dust remover which is used for removing dust generated in the grinding process and returning the dust as a secondary raw material to the 3D printing material of the building.
Further, the evaporator is connected to the homogenizing tank through a condensing duct.
The invention has the technical characteristics and beneficial effects that:
according to the invention, preliminary red mud dealkalization is achieved through neutralization of the red mud and the industrial acidic wastewater, and meanwhile, subsequent treatment is carried out, so that the dealkalization rate of the finally obtained red mud reaches 95%, which is a great progress compared with other methods for dealkalization of the red mud, and the anti-alkali of the building 3D printing material can be effectively prevented. Meanwhile, the invention can realize large-scale treatment of the red mud and the acidic wastewater and formation of the building material for 3D printing, has simple operation method and low cost, can solve the problem of serious pollution of the red mud and the acidic wastewater, and can also efficiently meet the requirements of the building material market.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a system for dealkalizing red mud and co-producing a red mud-based building material according to the present application.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The invention is further illustrated by the following figures and examples.
As introduced in the background art, in the industrial production process of aluminum, a lot of red mud is generated, the red mud cannot be well utilized due to the high alkali content of the red mud, and the existing dealkalization methods all have certain problems, aiming at the problems in the prior art, the embodiment of the invention provides a method for dealkalizing the red mud and coproducing red mud-based building materials, which comprises the following steps:
(1) Putting the red mud and the industrial acidic wastewater into a homogenizing tank for mixing, adjusting the mixture to be neutral, preparing slurry, and heating and homogenizing;
(2) Filter-pressing and drying the homogenized material to obtain a mixed material;
(3) The mixed material and magnesium phosphate cement are proportioned and ground;
(4) The ground raw materials and an additive are mixed and coagulated to prepare the building 3D printing material with printing and construction performances, wherein the raw materials are dealkalized red mud and magnesium phosphate cement, and the additive is boric acid.
The aluminum industry mostly uses Bayer process to produce aluminum, red mud is also a byproduct produced in a large amount by the process, and the chemical components of the red mud with the pH value of about 11.6 mainly comprise: 32.26% of Al 2 O 3 11.48% of SiO 2 6.96% of Fe 2 O 3 3.3% of TiO 2 20.21 percent of CaO, 8.67 percent of NaO/K 2 The loss on ignition of O and 8.26 percent, the acidic wastewater generated by modern industry mainly refers to wastewater with the pH value of less than 6, and mainly refers to wastewater discharged by enterprises of metallurgy, metal processing, petrochemical industry, chemical fiber, electroplating and the like, the industrial wastewater used in the invention is from a tobacco bench petrochemical enterprise with the pH value of 5.6, and mainly is industrial wastewater acid water with the acetic acid content of 10-20 percent.
NaO/K in chemical composition of dry material after filter pressing in acid and alkali 2 The content of O is reduced to 0.36% from 8.67%, naOH and KOH in the red mud are neutralized by means of industrial waste acid, dealkalization treatment of the red mud is realized, the red mud cannot be dealkalized completely, the red mud finally remains in calcined residues and is made into a building 3D printing material together with magnesium phosphate cement and the like, the alkalinity of the printing material is increased, the acid resistance of the printing material is enhanced, and meanwhile, the excessive alkalinity of the red mud can be prevented after dealkalization.
Preferably, in the step (1), the liquid-solid ratio of the obtained slurry is 5-7:1, different liquid-solid ratios have larger influence on the efficiency of dealkalization, when the liquid-solid ratio is higher than 7:1, the dealkalization efficiency is high, but the water resource consumption is high, and the economy is poor; the liquid-solid ratio is lower than 5:1, the dealkalization efficiency is not high, and the liquid-solid ratio is 5-7:1.
preferably, in the step (1), the heating temperature is 50-70 ℃, the red mud and the acidic wastewater need to be neutralized in the homogenizing tank, the temperature can be increased to improve the reaction efficiency, the waste heat recovery and utilization device is additionally arranged in the dealkalization process, the temperature of the homogenizing tank is increased while the waste heat is recovered, the energy consumption is reduced, the acid-base reaction speed is increased, and when the homogenizing heating temperature is 50-70 ℃, the dealkalization efficiency can reach more than 93%.
Preferably, in the step (3), in the mixture ratio of the mixed material to the magnesium phosphate cement, the mixed material is not higher than 8%, and when the mixed material is higher than 8%, the strength of the mixed material is obviously reduced.
Preferably, in the step (4), dust in the preparation process is treated by a dust remover and is returned to the building 3D printing material as a secondary raw material, so that the material is fully utilized, and the red mud recycling efficiency is improved.
Preferably, in the step (2), the press filtrate formed in the homogenization process is washed with water, and Na and K salts are obtained through high temperature, evaporation and crystallization, so that the extraction and utilization of available resources in the solid waste material are realized.
Preferably, in the step (4), the coagulation time is 5-60min.
In another embodiment of the present invention, as shown in fig. 1, a system for dealkalizing red mud and co-producing red mud-based building material is provided, which comprises a homogenizing pool, a filter press, a dryer and a pulverizer, which are connected in sequence, wherein the dryer is further connected with a hot water storage device, and the filter press is further connected with an evaporator; the dust remover is used for removing dust generated in the grinding process and returning the dust as a secondary raw material into the building 3D printing material; the evaporator is connected with the homogenizing pool through a condensing conduit.
The homogenizing tank provides a reaction site for the red mud and the industrial wastewater, and the red mud is dealkalized in the homogenizing tank; the filter press is used for carrying out filter pressing on the dealkalized slurry to realize solid-liquid separation of the slurry, the dryer is used for drying the solid separated by the filter press to obtain a dry material, the liquid separated by the filter press enters the evaporator, and the Na and K salts are obtained by evaporation and crystallization in the evaporator; and the pulverizer is used for pulverizing the mixed dry material and the magnesium phosphate cement, and the printable building 3D printing material is prepared after the powder obtained after the powder is mixed with the additive.
Heating the homogenization tank by using high-temperature exhaust tail gas of an electrolytic aluminum plant as an external heat source to keep the slurry in the homogenization tank at 50-70 ℃, introducing high-temperature steam obtained after heat exchange of a heat exchanger into the dryer as a heating medium, and introducing cooled flue gas into a dust remover for dust removal; in the evaporation-crystallization process, water can be guided into the homogenizing tank through the outside of the condensing pipe, so that the condensing efficiency is improved, and meanwhile, condensed water obtained by cooled high-temperature steam can also pass through the outside of the condensing pipe, so that the condensing efficiency is improved.
Example 1
A method for dealkalizing and coproducing red mud-based building materials comprises the following steps:
(1) Mixing red mud and industrial acidic wastewater according to the proportion of 1:5 is put into a homogenizing tank, adjusted into slurry, and then heated and homogenized, wherein the heating temperature is 50 ℃;
(2) Filter-pressing and drying the homogenized material to obtain a mixed material;
(3) Mixing the mixed material with magnesium phosphate cement according to the weight ratio of 5: after 95 percent of the raw materials are mixed, grinding;
(4) Mixing the ground raw materials with an additive in a mixing ratio of 100: and 0.4, then performing coagulation for 14min to prepare the building 3D printing material with printable and construction performance.
The dealkalization efficiency of the red mud in the embodiment is 86.3%, and the compressive strength of the prepared building 3D printing material is measured, wherein 2h is 30.4Mpa,1d is 51.1Mpa,3d is 58.6Mpa and 28d is 82.1Mpa.
Example 2
A method for dealkalizing and coproducing red mud-based building materials comprises the following steps:
(1) Mixing red mud and industrial acidic wastewater according to the proportion of 1:6, putting the mixture into a homogenizing tank, adjusting the mixture into slurry, and then heating and homogenizing the slurry at the heating temperature of 60 ℃;
(2) Filter-pressing and drying the homogenized material to obtain a mixed material;
(3) Mixing the mixed material with magnesium phosphate cement according to the weight ratio of 12:88, grinding;
(4) Mixing the ground raw materials with an additive in a mixing ratio of 100: and 0.4, then performing coagulation for 18min to prepare the building 3D printing material with printable and construction performance.
The dealkalization efficiency of the red mud in the embodiment is 96.7%, and the compressive strength of the prepared building 3D printing material is determined, wherein the compressive strength is 21.9Mpa for 2h, 42.3Mpa for 1d, 46.5Mpa for 3d, and 68.3Mpa for 28d.
Example 3
A method for dealkalizing and coproducing red mud-based building materials comprises the following steps:
(1) Mixing red mud and industrial acidic wastewater according to the proportion of 1:7 is put into a homogenizing tank in proportion, is adjusted into slurry, and is heated and homogenized at the heating temperature of 70 ℃;
(2) Filter-pressing and drying the homogenized material to obtain a mixed material;
(3) Mixing the mixed material with magnesium phosphate cement according to the weight ratio of 16: grinding after 84 proportion;
(4) Mixing the ground raw materials with an additive in a mixing ratio of 100: and 0.4, then performing coagulation for 27min to prepare the building 3D printing material with printable and construction performance.
The dealkalization efficiency of the red mud in the embodiment is 96%, and the compressive strength of the prepared building 3D printing material is measured, wherein the compressive strength is 12.3Mpa for 2h, 26.2Mpa for 1d, 34.7Mpa for 3d, and 42.8Mpa for 28d.
In the methods provided in examples 1 to 3, in step (1), the liquid-solid ratio of the industrial acidic wastewater to the red mud and the heating water temperature have a large influence on dealkalization efficiency, table 1 shows the relationship between the heating temperature and the dealkalization efficiency, it can be seen from table 1 that the dealkalization efficiency can reach 90% or more when the heating water temperature is 50 ℃ to 70 ℃, table 2 shows the influence of the liquid-solid ratio of the industrial acidic wastewater to the red mud and the dealkalization efficiency, and it can be seen from table 2 that the liquid-solid ratio of the industrial acidic wastewater to the red mud is 5 to 7: when 1, the dealkalization efficiency is higher.
TABLE 1 relationship between heating water temperature and dealkalization efficiency
Temperature of water 20℃ 30℃ 40℃ 50℃ 60℃ 70℃
Efficiency of dealkalization 84.8％ 86.7％ 89.4％ 93.2％ 95.7％ 95.5％
TABLE 2 relationship between liquid-solid ratio and dealkalization efficiency
Liquid to solid ratio 3：1 4：1 5：1 6：1 7：1
Efficiency of dealkalization 58.3％ 68.6％ 86.3％ 92.1％ 94.2％
In the methods provided in examples 1 to 3, the red mud doping amount in step (2) and the setting time in step (3) may have a certain effect on the performance of the building 3D printing material, and table 3 shows the relationship between the red mud doping amount and the compressive strength of the prepared building 3D printing material, and as can be seen from table 3, when the red mud doping amount is below 8%, and the setting time is 5 to 15min, the building 3D printing material can always maintain a good compressive strength.
TABLE 3 influence of Red mud incorporation on architectural 3D printing materials
Figure BDA0003791012770000081
Example 4
A system for dealkalizing and coproducing red mud-based building materials from red mud comprises a homogenizing pool, a filter press, a dryer and a pulverizer which are sequentially connected, wherein the dryer is also connected with a hot water storage device, and the filter press is also connected with an evaporator; the dust remover is used for removing dust generated in the grinding process and returning the dust serving as a secondary raw material to the building 3D printing material; the evaporator is connected with the homogenizing pool through a condensing conduit.
The technical solutions of the present invention have been described in detail with reference to the above embodiments, it should be understood that the above embodiments are only specific examples of the present invention and should not be construed as limiting the present invention, and any modifications, additions or similar substitutions made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for dealkalizing and coproducing red mud-based building materials is characterized by comprising the following steps:
(1) Putting the red mud and the industrial acidic wastewater into a homogenizing tank for mixing, adjusting the mixture to be neutral, preparing slurry, and heating and homogenizing;
(2) Filter-pressing and drying the homogenized material to obtain a mixed material;
(3) The mixed material and magnesium phosphate cement are proportioned and ground;
(4) And mixing the ground raw materials with an additive for coagulation to prepare the building 3D printing material with printing and building performances.
2. The method for dealkalizing and coproducing the red mud-based building material from the red mud according to claim 1, wherein in the step (1), the liquid-solid ratio of the slurry is 5-7:1.
3. the method for dealkalizing and coproducing the red mud-based building material from the red mud according to claim 2, wherein the heating temperature in the step (1) is 50 ℃ to 70 ℃.
4. The method for dealkalizing and coproducing the red mud-based building material from the red mud of claim 1, wherein in the step (3), the mixture ratio of the mixture to the magnesium phosphate cement is not higher than 8%.
5. The method for dealkalizing and coproducing the red mud-based building material from the red mud according to claim 1, wherein in the step (4), the dust in the preparation process is treated by a dust remover and is returned to the building 3D printing material as a secondary raw material.
6. The method for dealkalizing and coproducing the red mud-based building material from the red mud of claim 1, wherein the press filtrate formed in the homogenization process is washed with water in the step (2), and Na and K salts are obtained through high temperature, evaporation and crystallization.
7. The red mud dealkalization and red mud-based building material co-production method according to claim 1, wherein in the step (4), the setting time is 5-15min.
8. A system for dealkalizing and coproducing red mud-based building materials from red mud, which is used for realizing the method as claimed in any one of claims 1 to 7, is characterized by comprising a homogenizing pool, a filter press, a dryer and a pulverizer which are connected in sequence, wherein the dryer is also connected with a hot water storage device, and the filter press is also connected with an evaporator.
9. The system for dealkalizing and coproducing red mud-based building material from red mud according to claim 8, further comprising a dust remover for removing dust generated during the grinding process and returning the dust as a secondary raw material to the building 3D printing material.
10. The system for dealkalizing and coproducing red mud-based building material of claim 9, wherein the evaporator is connected to the homogenizing tank through a condensing conduit.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110156425A (en) * 2019-04-11 2019-08-23 山东大学 A kind of red mud base high-performance building repair materials and its preparation method and application
WO2020206833A1 (en) * 2019-04-11 2020-10-15 东北大学 Method of vortex melting, reducing, dealkalization, iron extraction and direct cement production of high-iron red mud
CN114804673A (en) * 2022-05-12 2022-07-29 广西田东锦鑫化工有限公司 Comprehensive utilization method of red mud

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Publication number Priority date Publication date Assignee Title
CN110156425A (en) * 2019-04-11 2019-08-23 山东大学 A kind of red mud base high-performance building repair materials and its preparation method and application
WO2020206833A1 (en) * 2019-04-11 2020-10-15 东北大学 Method of vortex melting, reducing, dealkalization, iron extraction and direct cement production of high-iron red mud
CN114804673A (en) * 2022-05-12 2022-07-29 广西田东锦鑫化工有限公司 Comprehensive utilization method of red mud

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