CN105601222A - Preparation method for gypsum product - Google Patents
Preparation method for gypsum product Download PDFInfo
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- CN105601222A CN105601222A CN201510980318.5A CN201510980318A CN105601222A CN 105601222 A CN105601222 A CN 105601222A CN 201510980318 A CN201510980318 A CN 201510980318A CN 105601222 A CN105601222 A CN 105601222A
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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
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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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Abstract
The invention provides a preparation method for a gypsum product. The preparation method comprises the following steps: a) grinding and screening gypsum raw materials and performing baking to obtain gypsum powder; b) mixing the gypsum powder, sodium hydrogen sulfate and water, and performing injection molding to obtain a gypsum test block, wherein a mass ratio of the gypsum powder to sodium hydrogen sulfate is 100 to (0.2-0.3); and c) drying the gypsum test block to obtain the gypsum product. Compared with the prior art, the preparation method for the gypsum product, provided by the invention, has the advantages that by adding a specific amount of sodium hydrogen sulfate, the drying rate of the gypsum product in the preparation process is increased on the basis of not reducing the water consumption, so that slurry in the preparation process has stable flowability and the prepared gypsum product is ensured to have relatively high strength. An experimental result shows that the drying rate of the gypsum product provided by the invention is more than 12.38% and the strength of the gypsum product is 2.2-2.5MPa.
Description
Technical field
The present invention relates to gypsum technical field, more particularly, relate to a kind of preparation side of plasteringMethod.
Background technology
Gypsum is a kind of broad-spectrum industrial materials and construction material, can be used for gypsum building products, waterMud set retarder, modelling, medical food additives, gas washing in SA production, filler, paint filler etc.In recent years, gypsum material and plastering are applied more in the decoration of architecture indoor and finishing, especiallyIn the decoration and finishing of home dwelling. Compared with other same type of material of application, plastering has qualityThe feature relatively light, intensity is high, fire protecting performance is good, the sheet material made from this material, it is fire-retardantFire resistance rating is one-level, is one of preferred material of various environment indoor decoratings.
At present, the preparation method of plastering will be dried after slip injection molding thick a calibration,Obtain plastering. Wherein, preparation process and the properties of product of rate of drying to plastering have very large shadowRing; Meanwhile, dry run is also the main source of energy consumption in preparation process, controls rate of drying to producingLine is energy-saving and cost-reducing significant. Prior art by adding blowing agent, water reducer or fecula in slipThe mode of coagulant improves the rate of drying in plastering preparation process. Wherein, blowing agent generally adoptsLauryl sodium sulfate K12 or compound prescription, can in plastering, form hollow, reduce plaster of ParisUse amount and aquation water consumption, thus the rate of drying in plastering preparation process improved; Water reducerCan improve the fluidity of plaster of Paris slip, reduce moulding water consumption, thereby improve rate of drying; RawThe leftover pieces fecula of powder coagulant for producing in gypsum board manufacture process, specific area is higher, adds toAfter slip, can play induced crystallization effect, reduce water consumption, thereby improve rate of drying.
But the mechanism that above-mentioned additive improves rate of drying is all by reducing water consumption, preparation processMiddle slip fluidity can obviously decline, and the plastering intensity obtaining is not high.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of preparation method of plastering, adopt thisThe bright preparation method who provides, in improving rate of drying, ensures that plastering has higher-strength.
The preparation method who the invention provides a kind of plastering, comprises the following steps:
A) after gypsum raw material grinding is sieved, smoke, obtain land plaster;
B) after land plaster, niter cake and water are mixed, carry out injection molding, obtain gypsum test block; Described stoneThe mass ratio of cream powder and niter cake is 100:(0.2～0.3);
C) gypsum test block is dried, obtains plastering.
Preferably, step a) described in the grade content of gypsum raw material be 80%～95%.
Preferably, step a) described in the grinding screen size of sieving be 15 order～25 orders.
Preferably, the temperature that step is smoked described in a) is 150 DEG C～160 DEG C, and the time is 50min～70min.
Preferably, step b) described in the crystallization water content of land plaster be 5.5%～6%.
Preferably, step b) described in the mass ratio of land plaster and water be 100:(60～70).
Preferably, step b) described in mix process specifically comprise the following steps:
B1) land plaster and niter cake are mixed, obtain powder;
B2) powder is added to the water mixing, obtains slip.
Preferably, step b2) described in mix mode for stir; The rotating speed of described stirring is150r/min～170r/min, the time is 25s～35s.
Preferably, step b) described in time of injection molding be 40min～50min.
Preferably, step c) described in dry temperature be 40 DEG C～60 DEG C, the time is 2h～24h.
The preparation method who the invention provides a kind of plastering, comprises the following steps: a) by gypsum raw materialAfter grinding sieves, smoke, obtain land plaster; B) after land plaster, niter cake and water are mixed,Carry out injection molding, obtain gypsum test block; The mass ratio of described land plaster and niter cake is 100:(0.2～0.3);C) gypsum test block is dried, obtains plastering. Compared with prior art, stone provided by the inventionThe preparation method of cream goods, by adding the niter cake of specific consumption, is not reducing on the basis of water consumption,Improve the rate of drying in plastering preparation process, thereby make slip in preparation process there is stable streamMoving degree, ensures that the plastering preparing has higher intensity. Experimental result shows, the present invention carriesThe index of aridity of the plastering of confession is more than 12.38%, and the intensity of plastering is 2.2MPa～2.5MPa.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, technical scheme of the present invention is clearly and completely described,Obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making under creative work prerequisiteThe every other embodiment obtaining, belongs to the scope of protection of the invention.
The preparation method who the invention provides a kind of plastering, comprises the following steps:
A) after gypsum raw material grinding is sieved, smoke, obtain land plaster;
B) after land plaster, niter cake and water are mixed, carry out injection molding, obtain gypsum test block; Described stoneThe mass ratio of cream powder and niter cake is 100:(0.2～0.3);
C) gypsum test block is dried, obtains plastering.
In the present invention, after gypsum raw material grinding is sieved, smoke, obtain land plaster. At thisIn bright, the grade content of described gypsum raw material is preferably 80%～95%, and more preferably 85%～90%. ?In the present invention, the grade content of described gypsum raw material refers to the weight of calcium sulfate in Unit Weight gypsum raw material.Kind and the source of the present invention to described gypsum raw material is not particularly limited, and adopts the natural stone of sulfur acid calciumThe waste residues such as the chemical by-product of cream or sulfur acid calcium and ardealite, fluorgypsum, boron gypsum all can. At thisIn bright preferred embodiment, described gypsum raw material is that grade content is that 85%～90% ardealite and grade containAmount is the compound of 85%～90% desulfurated plaster, and the mass ratio of described ardealite and desulfurated plaster is preferably7:(2～4), more preferably 7:3.
First the present invention sieves gypsum raw material grinding, obtains gypsum raw material powder. The present invention is to described powderThe equipment that mill sieves is not particularly limited, and adopts gypsum grinding machine well known to those skilled in the art. ?In the present invention, the process that described grinding sieves is conducive to smoke removing and subsequent step of attached water in processCarrying out. In the present invention, the screen size that described grinding sieves is preferably 15 order～25 orders, more preferablyBe 20 orders.
Complete described grinding and sieve after process, the present invention smokes the gypsum raw material powder obtaining,To land plaster. The present invention is not particularly limited the described equipment of smoking, and adopts those skilled in the art ripeThe baking oven of knowing. In the present invention, the object of smoking described in is by complete the attached water in gypsum raw materialRemove, control the crystallization water content of land plaster simultaneously. In the present invention, the temperature of smoking described in is preferably150 DEG C～160 DEG C, more preferably 155 DEG C; The described time of smoking is preferably 50min～70min, more excellentElect 60min as. In the present invention, after gypsum raw material grinding is sieved, smoke, obtain land plaster,In described land plaster, not containing attached water, the content of the crystallization water is controlled at 5.5%～6% simultaneously.
Obtain after described land plaster, the present invention carries out injection molding after land plaster, niter cake and water are mixed,Obtain gypsum test block. In the present invention, the mass ratio of described land plaster and niter cake is 100:(0.2～0.3), is preferably 100:0.2. In the present invention, the niter cake that adds specific consumption is to addingFast plastering is dry to have a significant effect.
In the present invention, land plaster, niter cake and water are mixed, the process of described mixing is preferably concreteComprise the following steps:
B1) land plaster and niter cake are mixed, obtain powder;
B2) powder is added to the water mixing, obtains slip.
In the present invention, land plaster and niter cake are mixed, obtain powder. The present invention is to described mixingProcess be not particularly limited, above-mentioned two kinds of powders can be mixed.
Obtain after described powder, the present invention, by the powder mixing that is added to the water, obtains slip. In the present inventionIn, the mode of described mixing is preferably stirring; The rotating speed of described stirring is preferably 150r/min～170r/min,More preferably 160r/min; The time of described stirring is preferably 25s～35s, more preferably 30s. The present inventionEquipment to described mixing is not particularly limited, and adopts stirring bowl well known to those skilled in the art.In the preferred embodiment of the invention, first mark thick water consumption according to difference water is added to described stirring bowlIn, more described powder is added and stirs bowl, then stir according to above-mentioned condition, obtain slip. ?In the present invention, the mass ratio of described land plaster and water is preferably 100:(60～70), more preferably 100:65。
Obtain after described slip, slip is carried out injection molding by the present invention, obtains gypsum test block. The present invention is to instituteThe grinding tool of stating injection molding is not particularly limited, and adopts three joint-trial moulds well known to those skilled in the art. ?In the present invention, the time of described injection molding is preferably 40min～50min, more preferably 45min. In the present inventionIn preferred embodiment, first slurry is poured into rapidly in three joint-trial moulds, is wiped off unnecessary slurry with scraper,Scrape plane surface, form removal after injection molding certain hour, obtains gypsum test block.
Obtain, after described gypsum test block, gypsum test block being dried, obtain plastering. The present invention coupleDescribed dry equipment is not particularly limited, and adopts electric drying oven with forced convection well known to those skilled in the art. In the present invention, described dry temperature is preferably 40 DEG C～60 DEG C, more preferably 50 DEG C; InstituteStating the dry time is preferably 2h～24h, more preferably 6h～8h.
The preparation method who the invention provides a kind of plastering, comprises the following steps: a) by gypsum raw materialAfter grinding sieves, smoke, obtain land plaster; B) land plaster, niter cake and water are mixed, enterRow injection molding, obtains gypsum test block; The mass ratio of described land plaster and niter cake is 100:(0.2～0.3);C) gypsum test block is dried, obtains plastering. Compared with prior art, stone provided by the inventionThe preparation method of cream goods, by adding the niter cake of specific consumption, is not reducing on the basis of water consumption,Improve the rate of drying in plastering preparation process, thereby make slip in preparation process there is stable streamMoving degree, ensures that the plastering preparing has higher intensity. Experimental result shows, the present invention carriesThe index of aridity of the plastering of confession is more than 12.38%, and the intensity of plastering is 2.2MPa～2.5MPa.
In addition, preparation method provided by the invention is simple to operate, cost is low, to plastering preparation processEnergy-saving and cost-reducing significant.
In order to further illustrate the present invention, be elaborated below by following examples. The present invention withLower embodiment gypsum raw material used is the horizontal power plant desulfurization gypsum of Feicheng stone and Liaocheng ardealite, above-mentioned two kindsThe grade content of gypsum is 85%～90%.
Embodiment 1
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.2% to mix, obtain powderMaterial; The water consumption thick according to 65% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity of the plastering that employing ZK-35A type electric vacunm drying case provides embodiment 1 is carried outDetect, result shows, the index of aridity of the plastering that the embodiment of the present invention 1 provides is 14.85%; AdoptThe intensity of the plastering that KZJ-500 type electric bending testing machine provides embodiment 1 detects, resultShow, the intensity of the plastering that the embodiment of the present invention 1 provides is 2.5MPa.
Embodiment 2
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.3% to mix, obtain powderMaterial; The water consumption thick according to 65% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides embodiment 2 and intensity are carried outDetect, result shows, the index of aridity of the plastering that the embodiment of the present invention 2 provides is 13.99%, and intensity is 2.2MPa。
Embodiment 3
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.2% to mix, obtain powderMaterial; The water consumption thick according to 65% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 40 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides embodiment 3 and intensity are carried outDetect, result shows, the index of aridity of the plastering that the embodiment of the present invention 3 provides is 12.38%, and intensity is2.3MPa。
Embodiment 4
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.2% to mix, obtain powderMaterial; The water consumption thick according to 65% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 6h in the air dry oven of 60 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides embodiment 4 and intensity are carried outDetect, result shows, the index of aridity of the plastering that the embodiment of the present invention 4 provides is 13.91%, and intensity is2.3MPa。
Embodiment 5
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.2% to mix, obtain powderMaterial; The water consumption thick according to 60% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides embodiment 7 and intensity are carried outDetect, result shows, the index of aridity of the plastering that the embodiment of the present invention 7 provides is 15.96%, and intensity is2.4MPa。
Embodiment 6
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.2% to mix, obtain powderMaterial; The water consumption thick according to 60% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 6h in the air dry oven of 60 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides embodiment 8 and intensity are carried outDetect, result shows, the index of aridity of the plastering that the embodiment of the present invention 8 provides is 15.56%, and intensity is2.2MPa。
Embodiment 7
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.3% to mix, obtain powderMaterial; The water consumption thick according to 60% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 40 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides embodiment 9 and intensity are carried outDetect, result shows, the index of aridity of the plastering that the embodiment of the present invention 9 provides is 13.56%, and intensity is2.2MPa。
Embodiment 8
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.2% to mix, obtain powderMaterial; The water consumption thick according to 70% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity and the intensity of the plastering that the method providing according to embodiment 1 provides embodiment 10 are enteredRow detects, and result shows, the index of aridity of the plastering that the embodiment of the present invention 10 provides is 14.85%, strongDegree is 2.4MPa.
Comparative example 1
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) according to the thick water consumption of 65% mark, water is added and stirred in bowl, more above-mentioned land plaster is added rapidlyEnter in water, under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured into rapidlyThree joint-trial moulds, wipe unnecessary slurry off with scraper, scrape plane surface, and form removal after injection molding 45min obtains gypsum examinationPiece.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides comparative example 1 and intensity are carried outDetect, result shows, the index of aridity of the plastering that comparative example 1 of the present invention provides is 12.26%, and intensity is2.0MPa。
Comparative example 2
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.1% to mix, obtain powderMaterial; The water consumption thick according to 65% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides comparative example 2 and intensity are carried outDetect, result shows, the index of aridity of the plastering that comparative example 2 of the present invention provides is 12.11%, and intensity is1.9MPa。
Comparative example 3
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) in above-mentioned land plaster, add the niter cake of land plaster quality 0.4% to mix, obtain powderMaterial; The water consumption thick according to 65% mark adds water to stir in bowl, more described powder is added to the water rapidly,Under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured rapidly into three joint-trial moulds,Wipe unnecessary slurry off with scraper, scrape plane surface, form removal after injection molding 45min, obtains gypsum test block.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides comparative example 3 and intensity are carried outDetect, result shows, the index of aridity of the plastering that comparative example 3 of the present invention provides is 13.86%, and intensity is1.7MPa。
Comparative example 4
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) according to the thick water consumption of 70% mark, water is added and stirred in bowl, more above-mentioned land plaster is added rapidlyEnter in water, under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured into rapidlyThree joint-trial moulds, wipe unnecessary slurry off with scraper, scrape plane surface, and form removal after injection molding 45min obtains gypsum examinationPiece.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides comparative example 4 and intensity are carried outDetect, result shows, the index of aridity of the plastering that comparative example 4 of the present invention provides is 11.26%, and intensity is1.9MPa。
Comparative example 5
(1) compound of 3.5kg ardealite and 1.5kg desulfurated plaster is carried out after grinding, cross 20 orders and divide sampleSieve, then puts into the baking oven of 155 DEG C and smokes 60min, obtains land plaster.
(2) according to the thick water consumption of 60% mark, water is added and stirred in bowl, more above-mentioned land plaster is added rapidlyEnter in water, under the speed conditions of 160r/min, stir 30s, obtain slip; Then slip is poured into rapidlyThree joint-trial moulds, wipe unnecessary slurry off with scraper, scrape plane surface, and form removal after injection molding 45min obtains gypsum examinationPiece.
(3) by above-mentioned gypsum test block dry 8h in the air dry oven of 50 DEG C, obtain plastering.
The index of aridity of the plastering that the method providing according to embodiment 1 provides comparative example 5 and intensity are carried outDetect, result shows, the index of aridity of the plastering that comparative example 5 of the present invention provides is 13.26%, and intensity is1.9MPa。
More known, under identical mark is thick, the index of aridity of plastering provided by the invention and intensity are all highIn comparative example, although higher temperature also can improve the index of aridity of plastering, add certain contentNiter cake larger on the impact of the index of aridity; Meanwhile, in the time that the addition of niter cake is 0.1%, rightThe raising of rate of drying is not obvious, and can reduce plastering intensity; When the addition of niter cake is 0.4%Time, rate of drying is improved to effect, but obvious to plastering strength decreased.
The above-mentioned explanation of the disclosed embodiments, makes professional and technical personnel in the field can realize or use thisInvention. To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can be in the situation that not departing from the spirit or scope of the present invention,Realize in other embodiments. Therefore, the present invention will can not be restricted to these embodiment shown in this article,But to meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a preparation method for plastering, is characterized in that, comprises the following steps:
A) after gypsum raw material grinding is sieved, smoke, obtain land plaster;
B) after land plaster, niter cake and water are mixed, carry out injection molding, obtain gypsum test block; Described stoneThe mass ratio of cream powder and niter cake is 100:(0.2～0.3);
C) gypsum test block is dried, obtains plastering.
2. preparation method according to claim 1, is characterized in that, step a) described in gypsumThe grade content of raw material is 80%～95%.
3. preparation method according to claim 1, is characterized in that, step a) described in grindingThe screen size of sieving is 15 order～25 orders.
4. preparation method according to claim 1, is characterized in that, step is smoked described in a)Temperature be 150 DEG C～160 DEG C, the time is 50min～70min.
5. preparation method according to claim 1, is characterized in that, step b) described in gypsumThe crystallization water content of powder is 5.5%～6%.
6. preparation method according to claim 1, is characterized in that, step b) described in gypsumThe mass ratio of powder and water is 100:(60～70).
7. preparation method according to claim 1, is characterized in that, step b) described in mixProcess specifically comprise the following steps:
B1) land plaster and niter cake are mixed, obtain powder;
B2) powder is added to the water mixing, obtains slip.
8. preparation method according to claim 7, is characterized in that, step b2) described in mixMode for stir; The rotating speed of described stirring is 150r/min～170r/min, and the time is 25s～35s.
9. preparation method according to claim 1, is characterized in that, step b) described in injection moldingTime be 40min～50min.
10. preparation method according to claim 1, is characterized in that, step is dry described in c)Temperature be 40 DEG C～60 DEG C, the time is 2h～24h.
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