CN112174556A - Preparation method of lightweight plastering gypsum by using semidry method oxidized desulfurized fly ash - Google Patents
Preparation method of lightweight plastering gypsum by using semidry method oxidized desulfurized fly ash Download PDFInfo
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- CN112174556A CN112174556A CN202011033988.3A CN202011033988A CN112174556A CN 112174556 A CN112174556 A CN 112174556A CN 202011033988 A CN202011033988 A CN 202011033988A CN 112174556 A CN112174556 A CN 112174556A
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- fly ash
- desulfurized fly
- plastering gypsum
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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
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
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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
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a preparation method of lightweight plastering gypsum by using semidry method oxidized desulfurized fly ash, belonging to the technical field of lightweight plastering gypsum. The method comprises the steps of oxidizing semi-dry desulfurized fly ash by an internal and external heating rotary kiln, fully oxidizing calcium sulfite in the semi-dry desulfurized fly ash into calcium sulfate, taking the oxidized desulfurized fly ash as a cementing material, and uniformly mixing the desulfurized fly ash with a coagulant, an inorganic filler, a lightweight aggregate and other modifiers to obtain the lightweight plastering gypsum, which is a material for wall plastering. The plastering gypsum obtained by the method has the characteristics of light plastering gypsum, is more optimized in performance, has application value in the market, saves cost, realizes resource utilization of semi-dry desulfurized fly ash, and plays a role in resource regeneration.
Description
Technical Field
The invention relates to the technical field of light plastering gypsum, in particular to a preparation method of light plastering gypsum by using semidry method oxidation desulfurized fly ash.
Background
Compared with a wet desulphurization process, the semi-dry desulphurization process has the advantages of less investment and small occupied area; no waste water and no white smoke are discharged; low desulfurization energy consumption, low operation cost and the like, so the method has the advantages of low desulfurization energy consumption, low operation cost and the like in this yearThe semi-dry desulfurization project is increased day by day, and the production amount of semi-dry desulfurization ash is increased year by year. According to statistics, nearly 1000 coal-fired units, sintering machines and pelletizing machines in China adopt a semi-dry desulfurization process, and the byproduct desulfurized ash is generated by more than 1000 million tons every year. The semi-dry desulfurization process has many advantages, but has the disadvantage that the desulfurized ash is difficult to utilize, and the main reason is that a large amount of calcium sulfite CaSO is contained in the desulfurized ash3And CaSO3Has the advantages of slow hydration reaction, poor stability and re-release of SO when meeting high temperature2Cause secondary pollution, so the CaSO in the semi-dry desulfurization ash3It is difficult to use it without treatment.
In view of the above problems of semi-dry desulfurized fly ash, Benzhahou et al successfully treated CaSO in desulfurized fly ash by using an internally and externally heated rotary kiln3Oxidation to anhydrous CaSO4The oxidation rate reaches more than 90 percent, and CaSO is contained in the desulfurized fly ash after oxidation3The content is below 3 percent, the performance is stable, and large-scale production can be realized. This lays a good foundation for the utilization of the semidry desulfurization ash.
Chinese patent: CN 105801067B, entitled "method for applying flue gas desulfurization ash modified material to wall plastering material", the patent describes a method of using MnO in a closed container2And (2) carrying out modification treatment on the flue gas desulfurization ash by using water and an oxidant to convert calcium oxide in the flue gas desulfurization ash into calcium hydroxide and convert calcium sulfite into calcium sulfate, and converting calcium sulfate dihydrate in the flue gas desulfurization ash into alpha-calcium sulfate hemihydrate under the condition of 100 ℃ water vapor saturation to obtain modified desulfurization ash, and then stirring for 5-10 minutes according to 80-95% of the modified desulfurization ash, 2-8% of alum powder, 0-15% of double flying powder and 0-5% of a water-retaining agent to obtain a wall plastering material, wherein the breaking strength is about 2.5MPa, the compressive strength is about 4.5MPa, and the technical standard of bottom plastering gypsum is met. However, according to the description of the patent, the obtained wall plastering material is actually surface plastering gypsum (without adding aggregate), and the wall plastering material in the patent is detected according to the standard of bottom plastering gypsum (with aggregate), so that the folding strength and the compressive strength of the obtained wall plastering material are actually lower, and the obtained wall plastering material does not meet the requirements of surface plastering gypsumThe flexural strength and compressive strength specified in (1) are not less than 3.0MPa and not less than 6.0 MPa. The patent is therefore indistinguishable on top and bottom plastered plasters.
Chinese patent: CN 102701618B, entitled "method for producing high-strength environment-friendly plastering gypsum by using calcium sulfite type desulfurized gypsum", the method described in the patent is to put the calcium sulfite type desulfurized gypsum into a fluidized bed furnace, continuously blow air into a tuyere of the fluidized bed furnace to make the interior of the fluidized bed furnace be an oxidizing atmosphere and make the calcium sulfite type desulfurized gypsum in a boiling state, stir-fry the calcium sulfite type desulfurized gypsum at 480-500 ℃, oxidize the main component calcium sulfite into II type anhydrous gypsum after 20-40 min, then add 25-35% of II type anhydrous gypsum activator and 0.2-0.4% of water-retaining agent into the II type anhydrous gypsum in sequence according to the mass, and mix uniformly to obtain the high-strength plastering gypsum, wherein the folding strength and the compressive strength of the high-strength plastering gypsum reach the standard of surface layer plastering gypsum. The process of oxidizing the calcium sulfite type desulfurized gypsum into the II type anhydrous gypsum in the patent can not be produced in large batch, and the doping amount of the II type anhydrous gypsum excitant is higher.
Disclosure of Invention
The invention aims to provide a preparation method of lightweight plastering gypsum by using semidry method oxidized desulfurized fly ash.
The method comprises the steps of oxidizing semi-dry desulfurized fly ash by an internal and external heating rotary kiln, fully oxidizing calcium sulfite in the semi-dry desulfurized fly ash into calcium sulfate, taking the oxidized desulfurized fly ash as a cementing material, and uniformly mixing the desulfurized fly ash with a coagulant, an inorganic filler, a light aggregate and other modifiers to obtain the light plastering gypsum.
The method specifically comprises the following steps:
(1) oxidizing the semidry desulfurized fly ash by an internal and external heating rotary kiln, and fully oxidizing calcium sulfite in the semidry desulfurized fly ash into calcium sulfate;
(2) and (2) taking the oxidized semi-dry desulfurized fly ash as a cementing material, and uniformly mixing the gelled material with inorganic filler, lightweight aggregate and other modifiers to prepare the lightweight plastering gypsum, wherein the oxidized semi-dry desulfurized fly ash accounts for 61-71 parts, the inorganic filler accounts for 10-23 parts, the lightweight aggregate accounts for 7-10 parts and the other modifiers account for 2-10 parts by mass. The performance parameters of the light plastering gypsum meet the standard requirements of GB/T28627-2012 plastering gypsum.
The semi-dry desulfurized fly ash is a byproduct of semi-dry desulfurization of flue gas of a steel mill or a power plant, and mainly comprises calcium sulfite, calcium oxide, calcium hydroxide, a small amount of calcium sulfate, calcium carbonate and the like.
In the step (1), the oxidation is carried out by using a three-section internal and external heating rotary kiln, the temperature in the rotary kiln is controlled at 550 ℃ and 650 ℃, the oxidation time is 1-2h, and the calcium sulfite in the desulfurized ash is converted into anhydrous calcium sulfate.
In the step (2), the inorganic filler is coarse whiting powder, and the particle size of the inorganic filler is 200-325 meshes; the light aggregate is vitrified micro-bead or expanded perlite, the particle size of the light aggregate is 50-70 meshes, and the volume weight is 80-120kg/m3(ii) a The other modifiers comprise water-retaining agents and coagulation regulating components, wherein the water-retaining agents account for 0.2-0.3 part of the total mixed materials, and the coagulation regulating components account for 1-10 parts of the total mixed materials according to the mass ratio; the water retention agent is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, methyl cellulose ether and hydroxypropyl starch ether, and the coagulation regulating component is one or two of sodium metasilicate and calcium sulfate hemihydrate.
Besides the above-mentioned oxidation modes, the oxidation mode of the semidry desulfurization ash can also increase or decrease the temperature in the kiln according to the conversion rate of calcium sulfite, and correspondingly shortens or prolongs the oxidation time.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the obtained plastering gypsum has the characteristics of light plastering gypsum, is more optimized in performance, has application value in the market, saves cost, realizes resource utilization of semi-dry desulfurization ash, and plays a role in resource regeneration.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following detailed description is given with reference to specific embodiments.
The invention provides a preparation method of lightweight plastering gypsum by using semidry method oxidation desulfurized fly ash.
The method comprises the steps of firstly oxidizing semi-dry desulfurized fly ash by an internal and external heating rotary kiln, fully oxidizing calcium sulfite in the semi-dry desulfurized fly ash into calcium sulfate, and uniformly mixing the oxidized desulfurized fly ash serving as a cementing material with an inorganic filler, a lightweight aggregate and other modifiers to obtain the lightweight plastering gypsum.
The method specifically comprises the following steps:
(1) oxidizing the semidry desulfurized fly ash by an internal and external heating rotary kiln, and fully oxidizing calcium sulfite in the semidry desulfurized fly ash into calcium sulfate;
(2) the oxidized desulfurized ash is used as a cementing material and is uniformly mixed with inorganic filler, lightweight aggregate and other modifiers.
The following description is given with reference to specific examples.
Example 1
Oxidizing the semidry desulfurization ash in a rotary kiln at 650 ℃ for 2h to fully oxidize the desulfurization ash, and then weighing the following materials in percentage by weight: and (3) uniformly mixing and stirring 61% of semi-dry method oxidized desulfurized ash, 23% of heavy calcium powder, 7% of vitrified micro bubbles, 9% of calcium sulfate hemihydrate and 0.25% of water-retaining agent to prepare the light plastering gypsum, and detecting the flexural and compressive strength and the volume density of the light plastering gypsum.
Example 2
Oxidizing the semidry desulfurization ash in a rotary kiln at 650 ℃ for 2h to fully oxidize the desulfurization ash, and then weighing the following materials in percentage by weight: 71 percent of semi-dry method oxidized desulfurized ash, 10 percent of coarse whiting powder, 10 percent of vitrified micro bubbles, 9 percent of calcium sulfate hemihydrate and 0.25 percent of water-retaining agent are mixed and stirred uniformly to prepare the light plastering gypsum, and the flexural and compressive strength and the volume density of the light plastering gypsum are detected.
Example 3
Oxidizing the semidry desulfurization ash in a rotary kiln at 650 ℃ for 2h to fully oxidize the desulfurization ash, and then weighing the following materials in percentage by weight: 71 percent of semi-dry method oxidized desulfurized ash, 10 percent of coarse whiting powder, 10 percent of vitrified micro bubbles, 9 percent of calcium sulfate hemihydrate, 2 percent of anhydrous sodium metasilicate and 0.25 percent of water-retaining agent are mixed and stirred uniformly to prepare the light plastering gypsum, and the flexural strength, the compressive strength and the volume density of the light plastering gypsum are detected.
The above 3 example test data are as follows:
the performance detection data can meet the technical requirements of light plastering gypsum in GB/T28627-2012 plastering gypsum, and the standard is specified as follows:
while the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. A preparation method of lightweight plastering gypsum by using semidry method oxidized desulfurized fly ash is characterized by comprising the following steps: the method comprises the following steps:
(1) oxidizing the semidry desulfurized fly ash by an internal and external heating rotary kiln, and fully oxidizing calcium sulfite in the semidry desulfurized fly ash into calcium sulfate;
(2) taking the semidry desulfurization ash oxidized in the step (1) as a cementing material, and uniformly mixing the cementing material with an inorganic filler, a lightweight aggregate and other modifiers to prepare the lightweight plastering gypsum, wherein the performance parameters of the lightweight plastering gypsum meet the standard requirements of GB/T28627-2012 plastering gypsum; wherein, the oxidized semi-dry desulfurization ash accounts for 61-71 parts, the inorganic filler accounts for 10-23 parts, the lightweight aggregate accounts for 7-10 parts, and other modifiers account for 2-10 parts by weight.
2. The method for preparing lightweight plastering gypsum from semi-dry oxidized desulfurized fly ash according to claim 1, which is characterized in that: the semi-dry desulfurized fly ash is a byproduct of semi-dry desulfurization of flue gas of a steel mill or a power plant.
3. The method for preparing lightweight plastering gypsum from semi-dry oxidized desulfurized fly ash according to claim 1, which is characterized in that: in the step (1), the oxidation is carried out by using a three-section internal and external heating rotary kiln, the temperature in the rotary kiln is controlled at 550-650 ℃, the oxidation time is 1-2h, and the calcium sulfite in the desulfurized ash is converted into anhydrous calcium sulfate.
4. The method for preparing lightweight plastering gypsum from semi-dry oxidized desulfurized fly ash according to claim 1, which is characterized in that: in the step (2), the inorganic filler is coarse whiting powder, and the particle size of the inorganic filler is 200-325 meshes; the light aggregate is vitrified micro-bead or expanded perlite, the particle size of the light aggregate is 50-70 meshes, and the volume weight is 80-120kg/m3(ii) a The other modifiers comprise water-retaining agents and coagulation regulating components, wherein the water-retaining agents account for 0.2-0.3 part of the total mixed materials, and the coagulation regulating components account for 1-10 parts of the total mixed materials according to the mass ratio; the water retention agent is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, methyl cellulose ether and hydroxypropyl starch ether, and the coagulation regulating component is one or two of sodium metasilicate and calcium sulfate hemihydrate.
5. The method for preparing lightweight plastering gypsum from semi-dry oxidized desulfurized fly ash according to claim 3, wherein the method comprises the following steps: the oxidation mode increases or decreases the temperature in the kiln according to the conversion rate of the calcium sulfite, and correspondingly shortens or prolongs the oxidation time.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897563A (en) * | 2021-03-05 | 2021-06-04 | 石家庄五星机械有限公司 | Process for producing anhydrous gypsum by using calcium sulfite hemihydrate |
| CN112897973A (en) * | 2021-02-01 | 2021-06-04 | 宝武集团环境资源科技有限公司 | Bottom layer plastering gypsum and preparation method thereof |
| CN112939495A (en) * | 2021-02-05 | 2021-06-11 | 北京北科环境工程有限公司 | Production process for processing plastering gypsum by using semidry desulfurization ash |
| CN114105588A (en) * | 2021-12-01 | 2022-03-01 | 上海市建筑科学研究院有限公司 | Lightweight plastering gypsum and preparation method thereof |
| CN114276110A (en) * | 2022-01-18 | 2022-04-05 | 北京北科环境工程有限公司 | Preparation method of gypsum building block |
| CN114804804A (en) * | 2022-05-31 | 2022-07-29 | 北京北科环境工程有限公司 | Preparation method of gypsum binder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897973A (en) * | 2021-02-01 | 2021-06-04 | 宝武集团环境资源科技有限公司 | Bottom layer plastering gypsum and preparation method thereof |
| CN112939495A (en) * | 2021-02-05 | 2021-06-11 | 北京北科环境工程有限公司 | Production process for processing plastering gypsum by using semidry desulfurization ash |
| CN112897563A (en) * | 2021-03-05 | 2021-06-04 | 石家庄五星机械有限公司 | Process for producing anhydrous gypsum by using calcium sulfite hemihydrate |
| CN114105588A (en) * | 2021-12-01 | 2022-03-01 | 上海市建筑科学研究院有限公司 | Lightweight plastering gypsum and preparation method thereof |
| CN114276110A (en) * | 2022-01-18 | 2022-04-05 | 北京北科环境工程有限公司 | Preparation method of gypsum building block |
| CN114804804A (en) * | 2022-05-31 | 2022-07-29 | 北京北科环境工程有限公司 | Preparation method of gypsum binder |
| CN114804804B (en) * | 2022-05-31 | 2023-01-24 | 北京北科环境工程有限公司 | Preparation method of gypsum binder |
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Application publication date: 20210105 |