CN114804804A - Preparation method of gypsum binder - Google Patents
Preparation method of gypsum binder Download PDFInfo
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- CN114804804A CN114804804A CN202210607032.2A CN202210607032A CN114804804A CN 114804804 A CN114804804 A CN 114804804A CN 202210607032 A CN202210607032 A CN 202210607032A CN 114804804 A CN114804804 A CN 114804804A
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization 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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00637—Uses not provided for elsewhere in C04B2111/00 as glue or binder for uniting building or structural materials
- C04B2111/00646—Masonry mortars
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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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- 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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- Ceramic Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a preparation method of a gypsum binder, which comprises the steps of simultaneously oxidizing and carbonating semi-dry desulfurized ash, and then mixing the treated semi-dry desulfurized ash with specific amounts of an exciting agent, a retarder, a water-retaining agent and an adhesive, and the like. When the semi-dry desulphurization ash recycling agent is used, water with a specific proportion is added to be used as a binder, so that the storage, the transportation and the use are convenient, the resource utilization of the semi-dry desulphurization ash is realized, a large amount of desulphurization ash can be consumed, the problems of large amount of stockpiling and pollution of the existing semi-dry desulphurization ash are solved, the environmental protection pressure of steel enterprises is reduced, and a new way is opened up for the resource utilization of the semi-dry desulphurization ash.
Description
Technical Field
The invention belongs to the field of industrial solid waste comprehensive treatment, and particularly relates to a preparation method of a gypsum binder.
Background
The semi-dry desulfurization ash is solid waste generated after desulfurization treatment of flue gas by adopting a semi-dry desulfurization process in the steel industry or the power industry. The semi-dry desulfurized fly ash has complex components and mainly contains CaSO generated by desulfurization 3 And CaO that has not reacted to completion to achieve ultra-low emission standards. Wherein CaSO 3 Slow hydration reaction and high stabilityHowever, CaO has a large dry shrinkage property, and thus, if the semi-dry desulfurized fly ash is directly used as a building material, the phenomena of structural cracking, insufficient strength, long setting time and the like are likely to occur, and the semi-dry desulfurized fly ash is difficult to be recycled. At present, semi-dry desulfurized fly ash is mainly stockpiled, consigned to be transported outside and buried, and the problem of recycling semi-dry desulfurized fly ash is difficult to solve fundamentally. CaSO in semi-dry desulfurization ash 3 And CaO is easy to cause structural cracking, low strength, falling off and the like, and no related technology for preparing the gypsum binder by using the semi-dry desulfurized fly ash is found at present.
Chinese patent publication CN210438429U discloses a system for oxidizing and modifying calcium sulfite in semi-dry desulfurized fly ash, which utilizes an internal and external heating rotary kiln to oxidize and modify CaSO in semi-dry desulfurized fly ash 3 Oxidation to form II anhydrous CaSO 4 Not only eliminates CaSO in the desulfurized fly ash 3 Also increases CaSO in the desulfurized fly ash 4 The content of the desulfurized fly ash greatly increases the gelling property of the desulfurized fly ash, and lays a good foundation for the utilization of the desulfurized fly ash by the semidry method.
Chinese patent publication No. CN105000857B discloses a gypsum binder and a preparation method thereof, wherein the gypsum binder is a slurry prepared by uniformly mixing 30-60% of gypsum powder, 0.01-0.03% of AH additive, 0.2-0.5% of AK additive, 0.05-0.10% of AX additive and 0.5-1.0% of AF additive. The main raw material used in the patent is wet desulphurization gypsum, the main component of the desulphurization gypsum is calcium sulfate hemihydrate, the desulphurization gypsum is produced by dehydrating industrial byproduct gypsum produced by a wet desulphurization process in steel or electric power enterprises at the temperature of 105 ℃, the gypsum is a good building material, can be directly used without any excitation treatment, and is widely applied in the market.
Disclosure of Invention
Based on the defects of the prior art, the invention provides a preparation method for preparing a gypsum binder by using semi-dry desulfurized fly ash after oxidation and carbonization treatment, so that resource utilization of the semi-dry desulfurized fly ash is realized.
The method is realized by the following technical scheme:
a preparation method of a gypsum binder comprises the following steps:
(1) putting the semi-dry desulfurization ash into a rotary kiln, introducing air or oxygen-enriched air (such as oxygen-enriched air containing 25% of oxygen), heating the rotary kiln to 650 ℃, introducing carbon dioxide gas source gas, keeping the reaction condition for 0.5-1.0 hour, discharging the solid product out of the rotary kiln, stopping introducing the air or the oxygen-enriched air, and stopping introducing the carbon dioxide gas source gas, wherein the ratio of the introduction amount of the semi-dry desulfurization ash to the introduction amount of the oxygen in the air or the oxygen-enriched air is 1000 kg: 0.5 to 1m 3 The introduction amount ratio of the semi-dry desulfurization ash to the carbon dioxide in the carbon dioxide gas source gas is 1000 kg: 0.2 to 0.5m 3 。
(2) And (2) placing the solid product obtained in the step (1) into a grinding device for grinding until the screen residue of a square-hole screen with the size of 0.3mm is less than 1.0 wt% and the screen residue of the square-hole screen with the size of 0.15mm is less than 10 wt%, so as to obtain the powdery oxidation and carbonation semi-dry desulfurization ash.
(3) Mixing 50-70 parts by weight of the powdery oxidized and carbonated semi-dry desulfurization ash obtained in the step (2) with 20-40 parts by weight of an activator to form a base mixture, then adding 0.05-0.2 wt% of retarder, 0.03-0.07 wt% of water retaining agent and 0.3-1.0 wt% of adhesive to form a gypsum binder mixture, and putting the gypsum binder mixture into a mixer to be uniformly mixed to obtain a gypsum binder product.
Preferably, the carbon dioxide gas source gas is high-temperature flue gas (containing 10-20% of carbon dioxide) of a steel enterprise.
Preferably, the semi-dry desulfurized fly ash is desulfurized by a semi-dry method to obtain desulfurized fly ash which is an industrial byproduct after the desulfurization of blast furnace flue gas in steel or electric power industry.
Preferably, the retarder is one of citric acid, sodium citrate or gypsum special protein retarder.
Preferably, the activator is calcium sulfate hemihydrate.
Preferably, the water retaining agent is hydroxypropyl methyl cellulose ether with 7.5 ten thousand viscosity.
Preferably, the adhesive is dispersible gelatine powder or polyvinyl alcohol 1788.
Preferably, the grinding device is a ball mill, and in the grinding process by using the ball mill, the feeding granularity is 1-2.5 cm, and the discharging granularity is 0.074-0.3 mm.
Preferably, the gypsum binder mixture in the step (3) is placed into a mixer to be uniformly mixed, and a double-shaft gravity-free horizontal mixing device is specifically adopted for mixing, wherein the double-shaft gravity-free horizontal mixing device comprises a stirring shaft, stirring blades, a stirring shell, a chain wheel, a chain and a driving motor; the stirring shafts are arranged in two, the two stirring shafts are horizontally (or approximately horizontally) arranged in the stirring shell, a plurality of rows of stirring blades are uniformly distributed on each stirring shaft, two chain wheels are arranged outside the stirring shell and are respectively connected with the two stirring shafts, one end of each chain is circularly connected with an output shaft of the driving motor, and the other end of each chain is reversely circularly connected with the two chain wheels respectively, so that the two stirring shafts rotate reversely relatively to realize uniform mixing of the entering materials under a weightless state; when the materials are uniformly mixed, the mixing time of each batch is 1-5 minutes, when the materials rotate, the stirring blades on two adjacent stirring shafts are arranged in a mutually crossed mode, and the rotating speeds of the two stirring shafts are the same and are both 50-69 r/min.
The double-shaft gravity-free horizontal mixing device drives the stirring blades to rotate through the reversely rotating stirring shafts, then drives the materials to rotate, and a fluidized weightlessness area and a rotary vortex area are formed in the middle part due to the fact that the stirring blades on the two stirring shafts are arranged horizontally integrally and are crossed with each other. The materials are in a weightless state under the mechanical action in the machine and are widely staggered to generate convection and expansion, so that uniform mixing is achieved, segregation is not generated when the materials are mixed, and the aim of uniform mixing is rapidly achieved. And is 60 percent lower than the common horizontal ribbon mixer in energy consumption.
The gypsum binder is prepared by the preparation method, water accounting for 40-50 wt% of the total amount of the gypsum binder is added into the gypsum binder and is uniformly stirred, and then slurry uniformly stirred is poured, molded, hardened and demoulded, so that the flexural strength of the gypsum binder is 2.1-2.5 MPa, the compressive strength of the gypsum binder is 5.5-9.2 MPa, the bonding strength of the gypsum binder is 0.7-1.35 MPa, and the water retention rate of the gypsum binder is 82-93% through detection.
A method of bonding gypsum products comprising the steps of:
and I, preparing a gypsum binder product by adopting the preparation method.
And II, mixing 100 parts by weight of the gypsum binder product prepared in the step I with 30-50 parts by weight of water, and uniformly stirring to obtain gypsum binder slurry.
And III, coating the gypsum binder slurry obtained in the step II on the surface to be bonded of the gypsum material, and contacting the other gypsum material with the surface to be bonded to realize the bonding of the gypsum material.
Preferably, the gypsum material is gypsum blocks, gypsum lines, gypsum plates or other gypsum ornaments.
The invention has the technical effects that:
the untreated semi-dry desulfurized fly ash contains more calcium sulfite and calcium oxide, after the untreated semi-dry desulfurized fly ash is mixed with water, the calcium sulfite has retarding and expanding properties, and the calcium oxide has larger drying shrinkage property and is easy to cause cracking. Therefore, the semi-dry desulfurization ash is firstly treated by specific oxidation and carbonation, calcium sulfite is oxidized into calcium sulfate by fully oxidizing in a rotary kiln at the temperature of 500-650 ℃, carbon dioxide gas is introduced into the rotary kiln (preferably high-temperature flue gas of a steel plant is introduced, the carbon dioxide in the rotary kiln is used, the high-temperature flue gas has relatively high temperature, energy can be directly supplied to the oxidation and carbonation processes, the energy of the flue gas is recovered while the carbon dioxide is recovered, and the supply of external energy is reduced), calcium oxide or calcium hydroxide is carbonized to form calcium carbonate with stable performance, and the optimized content of the components of the semi-dry desulfurization ash after oxidation and carbonation is obtained by reasonably controlling the amount of each raw material and the treatment time, so that the semi-dry desulfurization ash has gelatinization and stability. The main component of the semidry desulfurized fly ash after oxidation and carbonation is II type anhydrous calcium sulfate, the hydration reaction is slow, the early strength is low, therefore, a specific amount of excitant is required to be added to promote the hydration rate of the specific desulfurized fly ash, and the flexural strength and the compressive strength of the binder are increased, thereby improving the strength of the product.
Meanwhile, on the basis, a specific amount of water-retaining agent, retarder and adhesive are added, so that the bonding strength and the water-retaining property of the product are improved.
Meanwhile, the operability of construction is ensured by adding the retarder with a specific proportion; the water retention of the gypsum binder is ensured by adding the water retention agent with a specific proportion, so that the binder is not easy to lose water and is separated from a base surface; the bonding strength of the gypsum binder is ensured by incorporating a specific proportion of binder.
The gypsum binder obtained by the invention can be used as a binder by adding water in a specific proportion when in use, is convenient to store, transport and use, realizes resource utilization of semi-dry desulfurized fly ash, can consume a large amount of desulfurized fly ash, solves the problems of large stockpiling and pollution of the semi-dry desulfurized fly ash at present, relieves the environmental protection pressure of steel enterprises, and opens up a new way for resource utilization of the semi-dry desulfurized fly ash.
Detailed Description
The technical solutions of the present invention are further described with reference to examples, and it should be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and alterations of this invention will become apparent to those skilled in the art without departing from the spirit and scope of this invention.
Example 1
Introducing air and carbon dioxide (blast furnace flue gas) into the semidry desulfurization ash in a rotary kiln at the temperature of 500-650 ℃ for oxidation and carbonization treatment (semidry desulfurization ashThe usage amount ratio of the dry desulfurization ash to the oxygen in the air is 0.8m for each ton of the semi-dry desulfurization ash 3 The ratio of the amount of carbon dioxide introduced into the semidry desulfurized fly ash to the amount of carbon dioxide introduced into the gas from the carbon dioxide source is 0.3m per ton of semidry desulfurized fly ash 3 ) Grinding the treated desulfurized ash until the residue of a 0.3mm square-hole sieve is less than 1.0 percent and the residue of a 0.15mm square-hole sieve is less than 10 percent, and then weighing the following materials in percentage by weight: 60 parts of grinded oxidative carbonation desulfurization ash, 40 parts of semi-hydrated gypsum, 0.15 wt% of citric acid (retarder is also called adhesive), 0.05 wt% of hydroxypropyl methyl cellulose ether and 0.5 wt% of dispersible rubber powder, wherein the retarder, the water-retaining agent and the reinforcing agent are added in an external mixing mode (namely the total amount of the mixture of the oxidative carbonation desulfurization ash and the semi-hydrated gypsum is used as 100% of the setting proportion). The materials are uniformly mixed, 48% of water is added into the mixture, the mixture is uniformly stirred, and then the uniformly stirred slurry is poured and formed, and after hardening, the slurry is demoulded to detect relevant performance indexes, wherein the indexes are shown in table 1.
Comparative example 1
Directly grinding the semidry desulfurization ash without any oxidation and carbonation treatment until the residue of a 0.3mm square-hole sieve is less than 1.0 percent and the residue of a 0.15mm square-hole sieve is less than 10 percent, and then weighing the following materials in percentage by weight: 60% of desulfurized ash, 40% of semi-hydrated gypsum, 0.15% of citric acid, 0.05% of hydroxypropyl methyl cellulose ether (water-retaining agent) and 0.5% of dispersible rubber powder (reinforcing agent) are uniformly mixed to obtain the gypsum binder, wherein the retarder, the water-retaining agent and the reinforcing agent are added in an external mixing method. The materials are uniformly mixed, 48% of water is added into the mixture, the mixture is uniformly stirred, and then the uniformly stirred slurry is poured and formed, and after hardening, the slurry is demoulded to detect relevant performance indexes, wherein the indexes are shown in table 1.
Example 2
Introducing air and carbon dioxide (blast furnace flue gas) into the semi-dry desulfurization ash in a rotary kiln at the temperature of 500-650 ℃ for oxidation and carbonization (the using amount ratio of the semi-dry desulfurization ash to oxygen in the air is 0.65m for each ton of the semi-dry desulfurization ash 3 The ratio of the amount of carbon dioxide introduced into the semidry desulfurized fly ash to the amount of carbon dioxide introduced into the gas from the carbon dioxide source is 0.38m per ton of semidry desulfurized fly ash 3 ) Grinding the treated desulfurized ash until the residue of a 0.3mm square-hole sieve is less than 1.0 percent and the residue of a 0.15mm square-hole sieve is less than 10 percent, and then weighing the following materials in percentage by weight: 65% of the ground desulfurized fly ash, 35% of the semi-hydrated gypsum, 0.1% of citric acid, 0.07% of hydroxypropyl methyl cellulose ether and 0.8% of dispersible rubber powder are uniformly mixed to obtain the gypsum binder, wherein the retarder, the water-retaining agent and the reinforcing agent are added in an external mixing method. The materials are uniformly mixed, 44% of water is added into the mixture to be uniformly stirred, and then the uniformly stirred slurry is poured and formed, and after hardening, the slurry is demoulded to detect relevant performance indexes, wherein the indexes are shown in table 1.
Comparative example 2
Directly grinding the semidry desulfurization ash without any oxidation and carbonation treatment until the residue of a 0.3mm square-hole sieve is less than 1.0 percent and the residue of a 0.15mm square-hole sieve is less than 10 percent, and then weighing the following materials in percentage by weight: 65% of desulfurized ash, 35% of semi-hydrated gypsum, 0.1% of citric acid, 0.07% of hydroxypropyl methyl cellulose ether and 0.8% of dispersible rubber powder are uniformly mixed to obtain the gypsum binder, wherein the retarder, the water-retaining agent and the reinforcing agent are added in an external mixing method. The materials are uniformly mixed, 44% of water is added into the mixture to be uniformly stirred, and then the uniformly stirred slurry is poured and formed, and after hardening, the slurry is demoulded to detect relevant performance indexes, wherein the indexes are shown in table 1.
Example 3
Introducing carbon dioxide into the semi-dry desulfurization ash in a rotary kiln at the temperature of 500-650 ℃ for oxidation and carbonization, grinding the treated desulfurization ash until the residue of a 0.3mm square-hole sieve is less than 1.0 percent and the residue of a 0.15mm square-hole sieve is less than 10 percent, and then weighing the following materials in percentage by weight: 70% of the pulverized desulfurized ash, 30% of semi-hydrated gypsum, 0.1% of citric acid, 0.07% of hydroxypropyl methyl cellulose ether and 1.0% of dispersible rubber powder are uniformly mixed to obtain the gypsum binder, wherein the retarder, the water-retaining agent and the reinforcing agent are added in an external mixing method. The materials are uniformly mixed, 42% of water is added into the mixture, the mixture is uniformly stirred, and then the uniformly stirred slurry is poured and formed, and after hardening, the slurry is demoulded to detect relevant performance indexes, wherein the indexes are shown in table 1.
Comparative example 3
Directly grinding the semidry desulfurization ash without any oxidation and carbonation until the residue of a 0.3mm square-hole sieve is less than 1.0 percent and the residue of a 0.15mm square-hole sieve is less than 10 percent, and then weighing the following materials in percentage by weight: 70 percent of desulfurized ash, 30 percent of semi-hydrated gypsum, 0.1 percent of citric acid, 0.07 percent of hydroxypropyl methyl cellulose ether and 1.0 percent of dispersible rubber powder are uniformly mixed to obtain the gypsum binder, wherein the retarder, the water-retaining agent and the reinforcing agent are added in an external mixing method. The materials are uniformly mixed, 42% of water is added into the mixture, the mixture is uniformly stirred, and then the uniformly stirred slurry is poured and formed, and after hardening, the slurry is demoulded to detect relevant performance indexes, wherein the indexes are shown in table 1.
Table 1 shows the performance specifications of the gypsum binders of examples 1 to 3 and comparative examples 1 to 3.
TABLE 1
As can be seen from Table 1, the gypsum binders obtained by subjecting the semi-dry desulfurized fly ash to the specific oxidation and carbonation treatments are higher in flexural strength, compressive strength and cohesive strength as a whole than those obtained without treatment without lowering the water retention rate.
Application examples
A preparation method of gypsum comprises the following steps:
i, preparing a gypsum binder product by the preparation method of example 1;
II, mixing 100 parts by weight of the gypsum binder product prepared in the step I with 38 parts by weight of water, and uniformly stirring to obtain gypsum binder slurry;
and III, smearing the gypsum binder slurry obtained in the step II on the surface to be bonded of the gypsum block, contacting another gypsum block or gypsum line with the surface to be bonded smeared with the gypsum binder slurry, applying pressure, and standing for 1-2 min to realize bonding of gypsum materials.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A preparation method of a gypsum binder is characterized by comprising the following steps:
(1) putting the semidry desulfurization ash into a rotary kiln, introducing air or oxygen-enriched air, heating the rotary kiln to 500-650 ℃, introducing carbon dioxide gas source gas, keeping the reaction condition for 0.5-1.0 hour, discharging the solid product out of the rotary kiln, stopping introducing the air or the oxygen-enriched air, and stopping introducing the carbon dioxide gas source gas; wherein the introduction amount ratio of the semi-dry desulfurization ash to oxygen in air or oxygen-enriched air is 1000 kg: 0.5 to 1m 3 The introduction amount ratio of the semi-dry desulfurization ash to the carbon dioxide in the carbon dioxide gas source gas is 1000 kg: 0.2 to 0.5m 3 ；
(2) Putting the solid product obtained in the step (1) into a grinding device for grinding until the siftage of a square-hole sieve with 0.3mm is less than 1.0 wt% and the siftage of the square-hole sieve with 0.15mm is less than 10 wt%, so as to obtain powdery oxidized carbonation semi-dry desulfurization ash;
(3) mixing 50-70 parts by weight of the powdery oxidized and carbonated semi-dry desulfurization ash obtained in the step (2) with 20-40 parts by weight of an activator to form a base mixture, then adding 0.05-0.2 wt% of retarder, 0.03-0.07 wt% of water retaining agent and 0.3-1.0 wt% of adhesive to form a gypsum binder mixture, and putting the gypsum binder mixture into a mixer to be uniformly mixed to obtain a gypsum binder product.
2. The method for preparing the gypsum binder according to claim 1, wherein the carbon dioxide gas source gas is high-temperature flue gas of steel enterprises.
3. The method for preparing the gypsum binder according to claim 1, wherein the semi-dry desulfurized fly ash is desulfurized fly ash obtained by a semi-dry method from blast furnace flue gas in steel or electric power industry as an industrial byproduct.
4. The method of claim 1, wherein the retarder is one of citric acid, sodium citrate, or a gypsum specific protein retarder.
5. The method of preparing a gypsum binder according to claim 1, wherein the activator is calcium sulfate hemihydrate.
6. The method of preparing gypsum binder as claimed in claim 1, wherein the water retaining agent is hydroxypropyl methyl cellulose ether with 7.5 ten thousand viscosity.
7. The method for preparing the gypsum binder according to claim 1, wherein the binder is dispersible gelatine powder or polyvinyl alcohol 1788.
8. The method for preparing a gypsum binder according to claim 1, wherein the grinding device is a ball mill, and the feed particle size is about 1-2.5 cm and the discharge particle size is about 0.074-0.3 mm during grinding using the ball mill.
9. The method for preparing a gypsum binder according to claim 1, wherein the gypsum binder mixture in step (3) is put into a mixer for uniform mixing, and the uniform mixing is carried out by a double-shaft gravity-free horizontal mixing device, wherein the double-shaft gravity-free horizontal mixing device comprises a stirring shaft, stirring blades, a stirring shell, a chain wheel, a chain and a driving motor; the stirring shafts are horizontally arranged in the stirring shell, a plurality of rows of stirring blades are uniformly distributed on each stirring shaft, two chain wheels are arranged outside the stirring shell and are respectively connected with one ends of the two stirring shafts, one end of each chain is connected with an output shaft of the driving motor in a surrounding manner, and the other end of each chain is connected with the two chain wheels in a reverse surrounding manner, so that the two stirring shafts rotate reversely relative to each other to uniformly mix the entering materials in a weightless state; when the materials are uniformly mixed, the mixing time of each batch is 1-5 minutes, when the materials rotate, the stirring blades on two adjacent stirring shafts are arranged in a mutually crossed mode, and the rotating speeds of the two stirring shafts are the same and are both 50-69 r/min.
10. The gypsum binder is prepared by the preparation method of any one of claims 1 to 9, and is characterized in that water accounting for 30-50 wt% of the total amount of the gypsum binder is added into the gypsum binder and uniformly stirred, then the uniformly stirred slurry is poured, formed, hardened and demoulded, and the flexural strength, the compressive strength and the bonding strength of the gypsum binder are respectively 2.1-2.5 MPa, 5.5-9.2 MPa, 0.7-1.35 MPa and 82-93% of water retention rate through detection.
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