CN110922150A - Desulfurized gypsum-based composite cementing material and application thereof - Google Patents
Desulfurized gypsum-based composite cementing material and application thereof Download PDFInfo
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- CN110922150A CN110922150A CN201911136024.9A CN201911136024A CN110922150A CN 110922150 A CN110922150 A CN 110922150A CN 201911136024 A CN201911136024 A CN 201911136024A CN 110922150 A CN110922150 A CN 110922150A
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 116
- 239000010440 gypsum Substances 0.000 title claims abstract description 116
- 239000000463 material Substances 0.000 title claims abstract description 106
- 239000002131 composite material Substances 0.000 title claims abstract description 32
- 239000011398 Portland cement Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000004576 sand Substances 0.000 claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 22
- 150000004645 aluminates Chemical class 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 12
- 239000000654 additive Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 68
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 27
- 239000002518 antifoaming agent Substances 0.000 claims description 17
- 238000005303 weighing Methods 0.000 claims description 11
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 9
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 9
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 9
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical group OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 9
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical group C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 239000013530 defoamer Substances 0.000 abstract 1
- 239000004519 grease Substances 0.000 description 8
- 239000003292 glue Substances 0.000 description 6
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本发明公开了一种脱硫石膏基复合胶凝材料及其应用，其中，该脱硫石膏基复合胶凝材料包括：主料、骨料、辅料、添加剂和适量的水，主料选用的是煅烧后的脱硫石膏(用量为65‑85wt％)，骨料选用的是沙漠砂(用量为15‑35wt％)，二者的用量合计100wt％，辅料包括铝酸盐水泥、白色硅酸盐水泥、普通硅酸盐水泥和粉煤灰，添加剂包括石膏缓凝剂、减水剂、分散剂、保水剂和消泡剂。本发明的有益之处在于：(1)以脱硫石膏为主料，可大大减少天然石膏开采量，节约石膏矿产资源；(2)以沙漠砂为骨料，既提高了脱硫石膏制品的强度，又开发利用了沙漠砂资源；(3)以该配方制得的石膏板自重较轻、强度较高，符合石膏板材的使用要求，具有非常好的推广利用价值及应用前景。The invention discloses a desulfurized gypsum-based composite cementitious material and an application thereof. The desulfurized gypsum-based composite cementitious material comprises: main material, aggregate, auxiliary material, additives and an appropriate amount of water, and the main material is calcined The desulfurized gypsum (the consumption is 65-85wt%), the aggregate is desert sand (the consumption is 15-35wt%), the consumption of the two is 100wt% in total, and the auxiliary materials include aluminate cement, white Portland cement, ordinary Portland cement and fly ash, additives include gypsum retarder, water reducer, dispersant, water retention agent and defoamer. The advantages of the present invention are: (1) Desulfurized gypsum is used as the main material, which can greatly reduce the amount of natural gypsum mined and save gypsum mineral resources; (2) The desert sand is used as the aggregate, which not only improves the strength of the desulfurized gypsum product, The desert sand resources are also developed and utilized; (3) the gypsum board prepared with this formula has light weight and high strength, meets the use requirements of gypsum board, and has very good promotion and utilization value and application prospect.
Description
Technical Field
The invention relates to a cementing material and application thereof, in particular to a desulfurized gypsum based composite cementing material and application thereof, belonging to the technical field of building materials.
Background
The desulfurized gypsum is an industrial byproduct obtained by treating sulfur dioxide in flue gas by industrial enterprises burning coal or fuel oil, has wide application field, and can be better utilized in buildings, building materials, industrial molds and artistic models, chemical industry, agriculture, food processing, medicine cosmetology and the like. The total yield of the desulfurized gypsum is huge every year, the utilization rate is low, and a large amount of desulfurized gypsum is piled up to form a mountain, thereby occupying a large amount of land resources and causing secondary pollution to the environment. In addition, at present, the desertification is increasingly serious, the storage quantity of desert sand resources is extremely rich, but the utilization rate is low, and the desert sand resources are not well utilized.
Disclosure of Invention
The invention aims to provide a desulfurized gypsum-based composite cementing material and application thereof.
In order to achieve the above object, the present invention adopts the following technical solutions:
a desulfurized gypsum based composite cementitious material, comprising: main materials, aggregate, auxiliary materials, additives and a proper amount of water, wherein:
the main material is calcined desulfurized gypsum, the aggregate is desert sand, the dosage of the main material is 65-85 wt%, the dosage of the aggregate is 15-35 wt%, and the total dosage of the main material and the aggregate is 100 wt%;
the auxiliary materials comprise aluminate cement, white portland cement, ordinary portland cement and fly ash, wherein the total dosage of the aluminate cement, the white portland cement and the ordinary portland cement is 5-13 wt% of the total dosage of the main materials and the aggregate, and the dosage of the fly ash is 1-9 wt% of the total dosage of the main materials and the aggregate;
the additive comprises a gypsum retarder, a water reducing agent, a dispersing agent, a water-retaining agent and a defoaming agent, wherein the dosage of the gypsum retarder is 0.05 wt% -0.12 wt% of the total dosage of the main material and the aggregate, the dosage of the water reducing agent is 0.55 wt% -1.35 wt% of the total dosage of the main material and the aggregate, the dosage of the dispersing agent is 0.2 wt% -1.0 wt% of the total dosage of the main material and the aggregate, the dosage of the water-retaining agent is 0.15 wt% -0.35 wt% of the total dosage of the main material and the aggregate, and the dosage of the defoaming agent is 0.08 wt% -0.36 wt% of the total dosage of.
The desulfurized gypsum based composite cementing material is characterized in that the calcined desulfurized gypsum is obtained by adopting the following method:
putting industrial residues of a thermal power plant into a resistance furnace, heating to 350 ℃ at the speed of 11 ℃/min by taking the room temperature as the initial temperature, calcining for 3h, and naturally cooling to obtain the thermal power plant.
The desulfurized gypsum-based composite cementing material is characterized in that the dosage ratio of the aluminate cement, the white Portland cement and the common Portland cement is 10:7: 3.
The desulfurized gypsum-based composite cementing material is characterized in that citric acid is selected as the gypsum retarder.
The desulfurized gypsum based composite cementing material is characterized in that the water reducing agent is a naphthalene sulfonic acid water reducing agent.
The desulfurized gypsum based composite cementing material is characterized in that the dispersant is building instant rubber powder.
The desulfurized gypsum based composite cementing material is characterized in that the water retaining agent is hydroxypropyl methyl cellulose.
The desulfurized gypsum based composite cementing material is characterized in that the defoaming agent is selected from grease defoaming agents.
The application of the desulfurized gypsum-based composite cementing material in the preparation of gypsum boards is characterized in that the method for preparing gypsum boards by using the desulfurized gypsum-based composite cementing material comprises the following steps:
step 1: weighing the raw materials according to a formula;
step 2: pouring aluminate cement, white portland cement and ordinary portland cement into a stirring pot A, and stirring at a low speed for 60 s;
step 3: pouring the calcined desulfurized gypsum and the desert sand into a stirring pot B, and stirring at a low speed for 60 s;
step 4: pouring the materials in the stirring pot A into the stirring pot B, and stirring at a low speed for 60 s;
step 5: pouring the fly ash into a stirring pot B, and stirring at a low speed for 60 s;
step 6: pouring the gypsum retarder into the stirring pot B, and stirring at a low speed for 30 s;
step 7: pouring the water reducing agent into the stirring pot B, and stirring at a low speed for 30 s;
step 8: pouring the water-retaining agent into the stirring pot B, stirring at a low speed for 30s, simultaneously pouring the water and the dispersing agent into the stirring pot C, and stirring at a low speed for 30 s;
step 9: pouring the materials in the stirring pot C into the stirring pot B;
step 10: and pouring the defoaming agent into the stirring pot B, firstly stirring at a low speed for 60s, then stirring at a high speed for 30s, then pouring into a mould, vibrating for molding, and naturally curing.
The invention has the advantages that:
(1) by taking the desulfurized gypsum as the main material, the exploitation amount of natural gypsum can be greatly reduced, gypsum mineral resources are saved, the damage to ecology in the exploitation and transportation process is reduced, the discharge amount of sulfur dioxide is reduced, secondary pollution and land occupation caused by stacking desulfurized gypsum waste are reduced by utilizing the desulfurized gypsum which is a solid waste, and the environment and land resources are protected;
(2) the desert sand is taken as the aggregate, so that the strength of the desulfurized gypsum product is improved, the desert sand resource is developed and utilized, and a new way is opened up for the comprehensive utilization of the desert sand;
(3) the aluminate cement, the white silicate cement and the common silicate cement are mixed together to generate flash set phenomenon, and can be matched with the setting speed of the desulfurized gypsum, so that the phenomenon that the desulfurized gypsum is cracked and damaged because the desulfurized gypsum is initially set and the cement is just set and hardened and generates volume expansion in the desulfurized gypsum is avoided, and the desulfurized gypsum board is not scattered after being soaked in water, so that the water resistance of the desulfurized gypsum board is improved, and the problem that the existing desulfurized gypsum board is poor in water resistance is solved;
(4) the gypsum board prepared by the formula has light self weight and high strength, meets the use requirement of gypsum boards, and has very good popularization and utilization values and application prospects.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Calcining desulfurized gypsum: the desulfurized gypsum is derived from industrial residue of a Xinjiang stone river Tianzifu power plant, the industrial residue is put into a resistance furnace, the room temperature is taken as the initial temperature, the temperature is raised to 350 ℃ at the speed of 11 ℃/min, the calcined gypsum is calcined for 3h, and the desulfurized gypsum is screened after being naturally cooled.
Example 1
Weighing the main materials, namely calcined desulfurized gypsum and aggregate, namely desert sand, wherein the calcined desulfurized gypsum accounts for 75 wt%, the desert sand accounts for 25 wt%, and the total amount of the calcined desulfurized gypsum and the desert sand accounts for 100 wt%.
Weighing the auxiliary materials of aluminate cement, white portland cement, ordinary portland cement and fly ash, wherein the mixing ratio (mass ratio) of the aluminate cement, the white portland cement and the ordinary portland cement is 10:7:3, the total dosage of the aluminate cement, the white portland cement and the ordinary portland cement is 9 wt% of the total dosage of the main material and the aggregate, and the dosage of the fly ash is 5 wt% of the total dosage of the main material and the aggregate.
Weighing additives, namely citric acid (gypsum retarder), a naphthalenesulfonic acid water reducing agent, building instant glue powder (dispersing agent), hydroxypropyl methylcellulose (water-retaining agent) and a grease defoaming agent, wherein the dosage of the citric acid is 0.08 wt% of the total dosage of the main material and the aggregate, the dosage of the naphthalenesulfonic acid water reducing agent is 0.95 wt% of the total dosage of the main material and the aggregate, the dosage of the building instant glue powder is 0.6 wt% of the total dosage of the main material and the aggregate, the dosage of the hydroxypropyl methylcellulose is 0.25 wt% of the total dosage of the main material and the aggregate, and the dosage of the grease defoaming agent is 0.22 wt% of the total dosage of the main material and the aggregate.
Laboratory water is weighed, and the using amount of the laboratory water is 60 wt% of the total using amount of the main materials and the aggregate.
Desulfurized gypsum: the performance of the desulfurized gypsum generated by coal thermal power generation is approximately consistent with that of the natural gypsum, the performance of the composite gel material cannot be influenced by replacing the natural gypsum with the desulfurized gypsum, the area of the discharged and piled site of the desulfurized gypsum can be reduced, the pollution of the desulfurized gypsum to the environment can be reduced, and the waste is changed into valuable.
Desert sand: the desert sand is used as the aggregate, so that the strength of the desulfurized gypsum product is improved, desert resources are developed, the utilization rate of the desert sand is improved, and a new way is opened up for the development and utilization of the desert sand.
Aluminate cement, white portland cement, ordinary portland cement: the self-strength is high, the material belongs to a hydraulic cementing material, and when the material is mixed with other materials, the material can be well blended with other materials, and the self-strength is further improved.
Pouring aluminate cement, white portland cement and ordinary portland cement into a stirring pot A, and stirring at a low speed for 60 s; pouring the calcined desulfurized gypsum and the desert sand into a stirring pot B, stirring at a low speed for 60s, then pouring the material in the stirring pot A into the stirring pot B, and stirring at a low speed for 60 s; pouring the fly ash into a stirring pot B, stirring at a low speed for 60s, then pouring the citric acid into the stirring pot B, stirring at a low speed for 30s, then pouring the naphthalene sulfonic acid water reducing agent into the stirring pot B, and stirring at a low speed for 30 s; pouring hydroxypropyl methyl cellulose into a stirring pot B, stirring at a low speed for 30s, simultaneously pouring water and the building quick-dissolving sol into the stirring pot C, stirring at a low speed for 30s, then pouring the materials in the stirring pot C into the stirring pot B, then pouring the grease defoaming agent into the stirring pot B, firstly stirring at a low speed for 60s, then stirring at a high speed for 30s, pouring the materials in the stirring pot B into a mould of 40mm multiplied by 160mm after stirring is finished, then vibrating for forming, and finally naturally curing for 7d under laboratory conditions.
The mechanical properties of the gypsum boards thus obtained were measured according to GB/T17669.3-1999 "mechanical Properties of building Gypsum", and the results are shown in Table 1.
TABLE 1 desulfurized gypsum based plasterboard mechanical Properties technical parameters
| Item | Apparent density | Flexural strength | Compressive strength |
| Parameter(s) | 1.23g/cm3 | 2.45MPa | 6.55MPa |
As can be seen from Table 1, the gypsum board prepared from the desulfurized gypsum-based composite cementing material provided by the invention has light self weight and high strength, meets the use requirements of gypsum boards, and has very good popularization and utilization values and application prospects.
Example 2
Weighing the main materials, namely the calcined desulfurized gypsum and the aggregate, namely the desert sand, wherein the usage amount of the calcined desulfurized gypsum is 70 wt%, the usage amount of the desert sand is 30 wt%, and the total usage amount of the calcined desulfurized gypsum and the desert sand is 100 wt%.
Weighing the auxiliary materials of aluminate cement, white portland cement, ordinary portland cement and fly ash, wherein the mixing ratio (mass ratio) of the aluminate cement, the white portland cement and the ordinary portland cement is 10:7:3, the total dosage of the aluminate cement, the white portland cement and the ordinary portland cement is 7 wt% of the total dosage of the main material and the aggregate, and the dosage of the fly ash is 3 wt% of the total dosage of the main material and the aggregate.
Weighing additives, namely citric acid (gypsum retarder), a naphthalenesulfonic acid water reducing agent, building instant glue powder (dispersing agent), hydroxypropyl methylcellulose (water-retaining agent) and a grease defoaming agent, wherein the dosage of the citric acid is 0.08 wt% of the total dosage of the main material and the aggregate, the dosage of the naphthalenesulfonic acid water reducing agent is 0.75 wt% of the total dosage of the main material and the aggregate, the dosage of the building instant glue powder is 0.4 wt% of the total dosage of the main material and the aggregate, the dosage of the hydroxypropyl methylcellulose is 0.2 wt% of the total dosage of the main material and the aggregate, and the dosage of the grease defoaming agent is 0.15 wt% of the total dosage of the main material and the aggregate.
Laboratory water is weighed, and the using amount of the laboratory water is 60 wt% of the total using amount of the main materials and the aggregate.
Gypsum board was produced in the same manner as in example 1, and was also subjected to natural curing under laboratory conditions for 7 d.
The mechanical properties of the gypsum board thus obtained were measured in the same manner as in example 1, and the results are shown in Table 2.
TABLE 2 desulfurized gypsum based plasterboard mechanical Properties technical parameters
| Item | Apparent density | Flexural strength | Compressive strength |
| Parameter(s) | 1.26g/cm3 | 2.05MPa | 5.46MPa |
As can be seen from Table 2, the gypsum board prepared from the desulfurized gypsum-based composite cementing material provided by the invention has light self-weight and high strength, meets the use requirements of gypsum boards, and has very good popularization and utilization values and application prospects.
Example 3
Weighing main materials, namely calcined desulfurized gypsum and aggregate, namely desert sand, wherein the usage amount of the calcined desulfurized gypsum is 65 wt%, the usage amount of the desert sand is 35 wt%, and the total usage amount of the calcined desulfurized gypsum and the desert sand is 100 wt%.
Weighing the auxiliary materials of aluminate cement, white portland cement, ordinary portland cement and fly ash, wherein the mixing ratio (mass ratio) of the aluminate cement, the white portland cement and the ordinary portland cement is 10:7:3, the total dosage of the aluminate cement, the white portland cement and the ordinary portland cement is 5 wt% of the total dosage of the main material and the aggregate, and the dosage of the fly ash is 1 wt% of the total dosage of the main material and the aggregate.
Weighing additives, namely citric acid (gypsum retarder), a naphthalenesulfonic acid water reducing agent, building instant glue powder (dispersing agent), hydroxypropyl methylcellulose (water-retaining agent) and a grease defoaming agent, wherein the dosage of the citric acid is 0.08 wt% of the total dosage of the main material and the aggregate, the dosage of the naphthalenesulfonic acid water reducing agent is 0.55 wt% of the total dosage of the main material and the aggregate, the dosage of the building instant glue powder is 0.2 wt% of the total dosage of the main material and the aggregate, the dosage of the hydroxypropyl methylcellulose is 0.15 wt% of the total dosage of the main material and the aggregate, and the dosage of the grease defoaming agent is 0.08 wt% of the total dosage of the main material and the aggregate.
Laboratory water is weighed, and the using amount of the laboratory water is 60 wt% of the total using amount of the main materials and the aggregate.
Gypsum board was produced in the same manner as in example 1, and was also subjected to natural curing under laboratory conditions for 7 d.
The mechanical properties of the gypsum board thus obtained were measured in the same manner as in example 1, and the results are shown in Table 3.
TABLE 3 desulfurized gypsum based plasterboard mechanical Properties technical parameters
| Item | Apparent density | Flexural strength | Compressive strength |
| Parameter(s) | 1.29g/cm3 | 1.60MPa | 4.08MPa |
As can be seen from Table 3, the gypsum board prepared from the desulfurized gypsum-based composite cementing material provided by the invention has light self weight and high strength, meets the use requirements of gypsum boards, and has very good popularization and utilization values and application prospects.
As can be seen from the parameters given in tables 1, 2 and 3, compared with the existing gypsum board, the gypsum board prepared by adopting the formula of the composite cementitious material and the method for preparing the gypsum board by using the composite cementitious material provided by the invention has the advantages of light dead weight, high strength, and very good popularization and utilization values and application prospects.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.
Claims (9)
1. A desulfurized gypsum based composite cementitious material, comprising: main material, aggregate, auxiliary material and additive, wherein:
the main material is calcined desulfurized gypsum, the aggregate is desert sand, the dosage of the main material is 65-85 wt%, the dosage of the aggregate is 15-35 wt%, and the total dosage of the main material and the aggregate is 100 wt%;
the auxiliary materials comprise aluminate cement, white portland cement, ordinary portland cement and fly ash, wherein the total dosage of the aluminate cement, the white portland cement and the ordinary portland cement is 5-13 wt% of the total dosage of the main materials and the aggregate, and the dosage of the fly ash is 1-9 wt% of the total dosage of the main materials and the aggregate;
the additive comprises a gypsum retarder, a water reducing agent, a dispersing agent, a water-retaining agent and a defoaming agent, wherein the dosage of the gypsum retarder is 0.05 wt% -0.12 wt% of the total dosage of the main material and the aggregate, the dosage of the water reducing agent is 0.55 wt% -1.35 wt% of the total dosage of the main material and the aggregate, the dosage of the dispersing agent is 0.2 wt% -1.0 wt% of the total dosage of the main material and the aggregate, the dosage of the water-retaining agent is 0.15 wt% -0.35 wt% of the total dosage of the main material and the aggregate, and the dosage of the defoaming agent is 0.08 wt% -0.36 wt% of the total dosage of.
2. The desulfurized gypsum-based composite cementitious material of claim 1, characterized in that said calcined desulfurized gypsum is obtained by the following method:
putting industrial residues of a thermal power plant into a resistance furnace, heating to 350 ℃ at the speed of 11 ℃/min by taking the room temperature as the initial temperature, calcining for 3h, and naturally cooling to obtain the thermal power plant.
3. The desulfurized gypsum based composite cementitious material of claim 1, characterized in that the ratio of the aluminate cement, white portland cement and ordinary portland cement is 10:7: 3.
4. The desulfurized gypsum-based composite cementitious material of claim 1, wherein citric acid is selected as the gypsum retarder.
5. The desulfurized gypsum based composite cementing material of claim 1, characterized in that said water reducing agent is naphthalene sulfonic acid water reducing agent.
6. The desulfurized gypsum based composite gelled material of claim 1, wherein the dispersant is selected from building instant rubber powder.
7. The desulfurized gypsum based composite gelled material of claim 1, wherein the water retaining agent is hydroxypropyl methylcellulose.
8. The desulfurized gypsum based composite gelled material of claim 1, wherein the antifoaming agent is selected from oil antifoaming agents.
9. Use of the desulphated gypsum-based composite cementitious material according to any one of claims 1 to 8 in the manufacture of gypsum board, characterised in that the method of manufacturing gypsum board using the desulphated gypsum-based composite cementitious material comprises the following steps:
step 1: weighing the raw materials according to a formula;
step 2: pouring aluminate cement, white portland cement and ordinary portland cement into a stirring pot A, and stirring at a low speed for 60 s;
step 3: pouring the calcined desulfurized gypsum and the desert sand into a stirring pot B, and stirring at a low speed for 60 s;
step 4: pouring the materials in the stirring pot A into the stirring pot B, and stirring at a low speed for 60 s;
step 5: pouring the fly ash into a stirring pot B, and stirring at a low speed for 60 s;
step 6: pouring the gypsum retarder into the stirring pot B, and stirring at a low speed for 30 s;
step 7: pouring the water reducing agent into the stirring pot B, and stirring at a low speed for 30 s;
step 8: pouring the water-retaining agent into the stirring pot B, stirring at a low speed for 30s, simultaneously pouring the water and the dispersing agent into the stirring pot C, and stirring at a low speed for 30 s;
step 9: pouring the materials in the stirring pot C into the stirring pot B;
step 10: and pouring the defoaming agent into the stirring pot B, firstly stirring at a low speed for 60s, then stirring at a high speed for 30s, then pouring into a mould, vibrating for molding, and naturally curing.
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