CN105217675B - Method for preparing alpha-semi-hydrated gypsum through beta-semi-hydrated gypsum recrystallization - Google Patents
Method for preparing alpha-semi-hydrated gypsum through beta-semi-hydrated gypsum recrystallization Download PDFInfo
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Abstract
A method for preparing alpha-semi-hydrated gypsum through beta-semi-hydrated gypsum recrystallization comprises the following steps: (1) preparing beta-semi-hydrated gypsum; (2) preparing beta-semi-hydrated gypsum mixed slurry; (3) preparing alpha-semi-hydrated gypsum through recrystallization; (4) preparing high-strength plaster. The method breaks through the research range of the conventional high-strength plaster production method and theory, develops a brand-new process method for producing alpha-semi-hydrated gypsum, can effectively reduce the energy consumption of high-strength plaster production, and can improve the production efficiency. The high-strength high-quality plaster product can be produced by utilizing natural gypsum and industrial by-product gypsum accordingly, the environmental pollution can be relieved, the environment protection can be facilitated, the research and development of the plaster industry can be promoted, and the improvement and application of the plaster material are promoted.
Description
Technical field
The present invention relates to building material field, more particularly to a kind of alpha-semi water plaster stone is produced with β-semi-hydrated gypsum recrystallization
Method, i.e., slough 1.5 water of crystallization and convert the method for producing high strength gypsum again so that dihydrate gypsum is first xeothermic.
Background technology
At present, Gypsum Fibrosum（Calcium sulfate）The state of presence has dihydrate gypsum, semi-hydrated gypsum, III type anhydrous gypsum, II type anhydrous
Gypsum Fibrosum, I type anhydrous gypsum（Also referred to as α types anhydrous gypsum）, dihydrate gypsum therein and semi-hydrated gypsum are in metastable condition,
Under certain conditions can mutual inversion of phases, the hydrone between two sheaths of dihydrate gypsum is heated effusion 3/4 i.e. 1.5 water
After molecule, Ca2+With SO4 2-Offsets one from another the semi-hydrated gypsum that formed；And dihydrate gypsum and semi-hydrated gypsum are under the conditions of certain water phase
There are dissolving and recrystallization to be inclined to.The semi-hydrated gypsum that dihydrate gypsum is formed under the conditions of different thermal dehydrations, its microcosmic atom
Without difference substantially in sequence；But in its microstructure, the loose or densification that atomic order is crystallized makes which on macro property
Show huge difference, thus the extreme phase crystal formation having under the different dehydration conditions of α types, two, β types.When dihydrate gypsum is in pressurization
Under the conditions of water vapour or in the heated in water solution of acid and salt, i.e., in the liquid phase or under steam pressure（Under wet heat condition）Dehydration is then
Alpha-semi water plaster stone can be formed.When dihydrate gypsum carries out thermal dehydration in a dry environment, i.e., it is dehydrated at ambient pressure（It is xeothermic
Under the conditions of）β-semi-hydrated gypsum can then be formed.
Gypsum Fibrosum powder based on β-semi-hydrated gypsum is referred to as plaster of Paris, is in 107～200 DEG C of temperature by dihydrate gypsum
Lower parch is sintered into Gypsum Fibrosum preparata, regrinds and is fine into powder, and conventional calcining production equipment is frying pan, rotary kiln, Peter's mill, boiling
Rise stove.
Building gypsum plaster based on β-semi-hydrated gypsum mineral has water requirement big, fast solidifying（Generally needed to be added
Retarder）, volume microdilatancy, greatly, poor water resistance, frost resistance are poor, low intensity for porosity, the characteristics of not wear-resisting, only can be used as room
Interior rendering decorated articles, graphite product and plasterboard etc., but produce easily, i.e., dihydrate gypsum is sloughed in heated dry air
1.5 water of crystallization are easy to, and production efficiency can be very high.
Gypsum Fibrosum based on alpha-semi water plaster stone is referred to as high strength gypsum, is that the temperature by dihydrate gypsum at 110～170 DEG C is satisfied
With vapour pressure or high concentration salt solutions（Salinity is typically larger than the 10% of gypsum quality）Middle boiling is boiled dehydration and forms alpha-semi water plaster stone,
Conventional calcining production equipment is horizontal or vertical still kettle（Generally require cleaning, drying equipment）.With alpha-semi water plaster stone mineral
Based on high strength gypsum have water requirement little, it is relatively slow to condense hardening, volume stability, porosity and lightweight, and intensity is good, wear-resisting
Etc. many excellent performances, in addition to it can be applicable to rendering, the high-grade material of plastering, many industries are applied also for, such as used
Make ceramic die, precision manufactureing, workmanship, gear division super hard gypsum, engineering plastics and rubber and Gypsum Fibrosum based self-leveling
Material etc..
Obviously, the high strength gypsum based on dihydrate gypsum manufacture alpha-semi water plaster stone mineral is with a wide range of applications, and is
The Main way of current plaster investigation of materials, prepares alpha-semi water plaster stone both at home and abroad（High strength gypsum）Research and the main method applied
Have：
1）Saturated vapor pressurization：I.e. autoclave method, is that block granular dihydrate gypsum is placed in still kettle, is passed through saturation water
Steam, steams certain hour in 110～170 DEG C of temperature pressures, and slowly dehydration is changed into alpha-semi water plaster stone, then drying to make dihydrate gypsum
And grinding, obtain final product alpha type high-strength gypsum.Which has the disadvantage that the dischargeable capacity utilization rate of still kettle is low, high energy consumption, low production efficiency.
2）Normal pressure salt solustion mehtod：Substantially using the cocrystallization characteristic between sulfate or between sulfate and villaumite,
It is in atmospheric conditions, levigate dihydrate gypsum powder to be placed in into saline solution（The quality of salt used by cocrystallization is dihydrate gypsum
More than the 15% of quality）In boil certain hour after, then filtered, washed（Remove the salt of cocrystallization）, it is dried, grinding system
Into high strength gypsum powder.Normal pressure salt solustion mehtod needs pressure vessel, and each operation equipment is also more complicated, and the alpha-semi water plaster stone knot for preparing
Brilliant degree is poor, desalination and to be dried difficulty big.
3）Hydro-thermal method：Including Static Water full-boiled process and Dynamic Water full-boiled process, it is by powdery dihydrate gypsum and the water added with crystal modifier
Solution mixed slurry is placed in reactor, and the pressure steaming and decocting of Jing certain hours is converted into alpha-semi water plaster stone, then Jing filter pressings or centrifugation
Dehydration, is dried, and grinding is obtained high strength gypsum powder.The method can produce high-strength（25～50MPa of dry compression）It is strong with superelevation（Dry-pressing
It is more than intensity 50MPa）Grade Gypsum Fibrosum powder, but have high demands to grade of gypsum, and complex process, low production efficiency, production capacity are less, energy
Consumption is high, high cost.
4）Do vexed method：It is to be placed in steam pressure Fu with spacer of sealing to heat dihydrate gypsum, with part dihydrate gypsum
The water taken off forms high-temperature water vapor and pressure steaming dehydration is carried out to remaining dihydrate gypsum.Product mineral are β-semi-hydrated gypsum and α-half water
The mixture of Gypsum Fibrosum, composition fluctuation are big, and intensity is less high.
5）Compromise method：It is compromise method or the combination method between steam pressure and hydro-thermal method, in levigate powder gypsum
Add containing carboxyl（The carboxylic acid salt solution of low-molecular-weight COO-) such as maleic acid, sodium citrate etc., pressurize in hermetic container
（0.2～0.5Mpa）, hydro-thermal stirring 1～3h of steaming and decocting, then after 1～2h of constant pressure and dry at a temperature of 100～160 DEG C, it is levigate to make
High strength gypsum powder.It is higher that the method remains energy consumption, high cost.
Obviously, although alpha-semi water plaster stone performance is good, which produces either steam pressure or normal pressure salt solustion mehtod, and which is sloughed
1.5 water of crystallization are converted into alpha-semi water plaster stone speed slowly, and heat consumption is high, low production efficiency, and comprehensive energy consumption is high, high cost.
In sum, it is that the value and quality for improving Gypsum Fibrosum needs a kind of brand-new technique for producing alpha-semi water plaster stone
Method.
The content of the invention
The technical problem to be solved is the defect for overcoming the existing method for producing alpha-semi water plaster stone to exist, and is carried
For a kind of method for producing alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization, energy consumption is relatively low, and production efficiency is higher.
The present invention solves its technical problem and adopts the technical scheme that, produces alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization
Method, slough 1.5 water of crystallization so that dihydrate gypsum is first xeothermic, generate β-semi-hydrated gypsum, then by β-semi-hydrated gypsum in additive
Under synergistic hygrothermal environment, alpha-semi water plaster stone is made in recrystallization conversion（High strength gypsum）, comprise the steps：
（1）Prepare β-semi-hydrated gypsum：Dihydrate gypsum is made by β-semi-hydrated gypsum with general xeothermic dewatering, will two
Water stone cream parch or is sintered into Gypsum Fibrosum preparata at a temperature of 107～200 DEG C, regrinds and is fine into powder, obtains final product building gypsum plaster；Or
After person adds the Calx equivalent to dihydrate gypsum weight 1.5-3% in raw material dihydrate gypsum, then prepare β-semi-hydrated gypsum；
（2）Prepare β-semi-hydrated gypsum mixed slurry：
Prepare equivalent to step（1）Gained β-semi-hydrated gypsum（That is building gypsum plaster）Quality 0.3～5%（It is preferred that 1.0～
4.0%, more preferably 1.4～3.2%）Additive, prepare β-semi-hydrated gypsum mixed slurry by following any one method：
Method one：Additive is soluble in water, the aqueous solution containing additive is configured to, by step（1）Gained β-half water stone
During cream adds the aqueous solution containing additive of temperature >=97 DEG C, mixed slurry is made；
Method two：Will be a part of additive soluble in water, it is configured to the aqueous solution containing additive；By step（1）Gained β-
Semi-hydrated gypsum is first premixed with another part additive for not being dissolved in water and is combined into homogeneous powder material, then uniform powder is added temperature >=97
DEG C the aqueous solution containing additive in, make mixed slurry；
Method three：By step（1）Gained β-semi-hydrated gypsum is first premixed with whole additives and is combined into homogeneous powder material, then will be uniform
During powder adds the water of temperature >=97 DEG C, mixed slurry is made；
In method one, two, three, the water content of control gained mixed slurry（The use of instant solution additive and β-semi-hydrated gypsum
The water yield）For step（1）Gained β-semi-hydrated gypsum（That is building gypsum plaster）The 25～250% of quality（It is preferred that 35～150%, more preferably
40～100%）；
（3）Recrystallization prepares alpha-semi water plaster stone：By step（2）Obtained mixed slurry is in 97 DEG C～160 DEG C of damp and hot bar
Under part（Steaming or constant pressure hydro-thermal are pressed such as）, 0.5～5.0h of Jing（It is preferred that 1～3h）Dissolving-recrystallization, conversion processing makes α-half water
Gypsum Fibrosum, obtains alpha-semi water plaster stone slip；
（4）High strength gypsum is made：With general drying, grinding method by step（3）The alpha-semi water plaster stone Jing of gained is straight
Connect dry, grinding and make high strength gypsum powder；Or Jing centrifugations or filtering means dehydration, drying, grinding make high strength gypsum powder；Or Jing atomizations
High strength gypsum powder is made in drying；
Or by step（3）The alpha-semi water plaster stone slip of gained direct moulding by casting when temperature is down to 80～99 DEG C is high-strength
Plastering, or Jing sloughs excessive moisture such as centrifuge dehydration or filtration sloughs superfluous water moulding by casting for high strength gypsum product.
Further, step（1）In, the dihydrate gypsum is natural dihydrate gypsum and/or industry pair Gypsum Fibrosum such as ardealite, takes off
Sulfur Gypsum Fibrosum.
Further, step（2）In, the additive includes crystal seed and recrystallization regulator.The crystal seed is preferably α-half
Water Gypsum Fibrosum powder（Or commercially available high strength gypsum powder）Crystal seed.The recrystallization regulator is to adjust the crystal formation adjustment of recrystallization habit
Agent, at least one being preferably as follows：Poly-dihydric alcohol（Such as oligoethylene glycol）, poly- trihydroxylic alcohol（Such as polyglycerol）, polycarboxylic acids and its
Salt（Such as carboxylate based water reducer）, melamine sulfonate（Such as melamine based water reducer）, LOMAR PWA EINECS 246-676-2 and its salt（Such as naphthalene system diminishing
Agent）, sulfamate, alkylsulfonate, binary, multicomponent organic acid（Such as succinic acid, luxuriant diacid, citric acid, tartaric acid, Malaysia
Sour enzyme）And its salt, calcium, magnesium, aluminum, ferrum, lithium, sodium, the water solublity villaumite of potassium, sulfate and acylate.
Further, the amount of seed in the additive is β-semi-hydrated gypsum（That is building gypsum plaster）The 0.15～3% of quality
（It is preferred that 0.5～2.5%, more preferably 1～2%）, the recrystallization regulator in additive is β-semi-hydrated gypsum（That is plaster of Paris
Powder）The 0.025～2% of quality（It is preferred that 0.1～1.5%, more preferably 0.4～1.2%）.
The know-why of the present invention：
1）Dissolving-recrystallization characteristic using semi-hydrated gypsum under the conditions of certain aqueous environment, with the dry of low-energy-consumption high-efficiency
Dihydrate gypsum is first converted into full-boiled process technique crystal defect is big, short texture β-semi-hydrated gypsum, and molten using β-semi-hydrated gypsum
The characteristics of solution degree is big, is the good alpha-semi water plaster stone of compact structure, crystallization degree by β-semi-hydrated gypsum dissolving-recrystallization.
2）Using levigate alpha-semi water plaster stone crystal as the inductivity crystal seed agent of β-semi-hydrated gypsum dissolving-recrystallization, promotion β-
The efficient recrystallization of semi-hydrated gypsum is alpha-semi water plaster stone crystal.
3）According to crystallization kineticses principle, C axles in semi-hydrated gypsum crystal growing process are changed with recrystallization crystal formation regulator
The speed of growth in direction, makes β-semi-hydrated gypsum recrystallization be the sturdy crystal of short cylinder alpha-semi water plaster stone.
4）With the additive adjustment dissolving-recrystallization process for compounding, and improve alpha-semi water plaster stone（High strength gypsum）Construction make
With performance and material behavior.
Beneficial effects of the present invention：
1）The research range of traditional high strength gypsum production method and theory is breached, a kind of production α-half water stone is opened
Cream（High strength gypsum）Brand-new process, can effectively reduce the energy consumption of high strength gypsum, improve production efficiency.
2）Beneficial to because of the suitable utilization natural gypsum of feelings and industry pair Gypsum Fibrosum（Waste gypsum）Produce high-strength high-quality Gypsum Fibrosum system
Product, beneficial to environmental pollution is mitigated, are conducive to environmental conservation.
3）The research and development of gypsum industry can be promoted, promoted the modified of gypsum material and applied.
Specific embodiment
The present invention is described in further details below in conjunction with specific embodiment.
Following tests are carried out in laboratory conditions, testing inspection condition according to《Plaster of Paris ordinary test condition》（GB/
T17669.1-1999）Standard.Dihydrate gypsum selects natural dihydrate gypsum, ardealite, desulfurated plaster；α in additive-half
The alpha-semi water plaster stone powder that the agent of water gypsum seed is respectively produced using conventional digesting technoloy, 80 tm screen of fineness more than 1%；It is additional
Recrystallization regulator in agent selects commercially available raw material.
Embodiment 1
Gypsum raw material selects natural dihydrate gypsum, alpha-semi water plaster stone powder crystal kind of the crystal seed agent in additive from preparation,
Recrystallization regulator in additive selects melamine water reducer, polyglycerol and the succinic acid of commercially available powdery.
Alpha-semi water plaster stone is produced as follows：
（1）Prepare β-semi-hydrated gypsum：Block dihydrate gypsum is crushed to into below 5mm, is bakeed in 130 DEG C（Bakee 1h）It is dry
Heat dehydration makes β-semi-hydrated gypsum, and rolling was broken to 120 mesh sieves, 98 DEG C of constant temperature；
（2）Prepare β-semi-hydrated gypsum slip：By the 20 grams of mixing of obtained β -2000 grams of semi-hydrated gypsum powder and crystal seed agent（It is brilliant
Agent is planted for the 1% of β-semi-hydrated gypsum quality）For uniform powder, by 5 grams of powdery melamine water reducers, 1 gram of polyglycerol and 2 grams of fourths two
Acid（Add up to the 0.4% of β-semi-hydrated gypsum quality）It is uniformly dissolved as aqueous solution in adding 800 grams of water（Water accounts for β-semi-hydrated gypsum matter
The 40% of amount）, 97 DEG C of water temperature, will mixed powder add aqueous solution in make mixed slurry；
（3）Recrystallization prepares alpha-semi water plaster stone：By step（2）Obtained mixed slurry recrystallization at a temperature of 97～99 DEG C
3h conversion processings make alpha-semi water plaster stone；
（4）High strength gypsum is made：By the alpha-semi water plaster stone of recrystallization, after 105 DEG C of forced air dryings in calorstat, grinding is extremely
80 tm screens more than 3%, that is, make high strength gypsum powder.
Gypsum Fibrosum powder obtained by the present embodiment is carried out into performance test, after testing, its water requirement 36%, 15 minutes presetting periods, eventually
19 minutes solidifying time, high strength gypsum powder is made into 40 × 40 × 160mm test blocks, 3h intensity resistance to compression 32.1MPa, anti-folding
7.4MPa, 7d intensity resistance to compression 45.7MPa, anti-folding 8.7MPa.
Embodiment 2
Gypsum raw material selects natural dihydrate gypsum, alpha-semi water plaster stone powder crystal kind of the crystal seed agent in additive from preparation,
Recrystallization regulator in additive selects commercially available polycarboxylate（Water reducer）, aluminium polychlorid and sodium succinate.
Alpha-semi water plaster stone is produced as follows：
（1）Prepare β-semi-hydrated gypsum：Block dihydrate gypsum is crushed to into below 5mm, xeothermic dehydration system is bakeed in 150 DEG C
Into β-semi-hydrated gypsum, rolling was broken to 120 mesh sieves, 97 DEG C of constant temperature；
（2）Prepare β-semi-hydrated gypsum slip：Will be obtained β -2000 grams of semi-hydrated gypsum powder and 40 grams of mixing of crystal seed agent equal
It is even（Crystal seed agent for β-semi-hydrated gypsum quality 2%）For mixed powder, by 10 grams of polycarboxylates, 4 grams of aluminium polychlorid（The water of aluminum
Dissolubility villaumite）With 2 grams of sodium succinates（Add up to the 0.8% of β-semi-hydrated gypsum quality）It is uniformly dissolved as water in adding 2000 grams of water
Solution（Water accounts for the 100% of β-semi-hydrated gypsum quality）, 97 DEG C of water temperature, will mixed powder add aqueous solution in make slip；
（3）Recrystallization prepares alpha-semi water plaster stone：Obtained slip is placed in closed kettle in 118 DEG C of recrystallization 1.5h conversions
Alpha-semi water plaster stone is made in process；
（4）High strength gypsum is made：To take out after the alpha-semi water plaster stone slurry release of recrystallization in kettle, be placed in calorstat
After 105 DEG C of forced air dryings, grinding to 80 tm screens more than 3%, that is, make high strength gypsum powder.
Gypsum Fibrosum powder obtained by the present embodiment is carried out into performance test, after testing, its detection water requirement 37.8%, the presetting period 17
High strength gypsum powder is made 40 × 40 × 160mm test blocks, 3h intensity resistance to compression 33.8MPa, anti-folding by minute, final setting time 19 minutes
7.7MPa, 7d baked strength resistance to compression 57.6MPa, anti-folding 9.8MPa.
Embodiment 3
Ardealite of the gypsum raw material from caking, alpha-semi water plaster stone powder crystal kind of the crystal seed agent in additive from preparation,
Recrystallization regulator in additive selects commercially available naphthalene sulfonate（Water reducer）, water-soluble polyethylene glycol and sodium tartrate.
Alpha-semi water plaster stone is produced as follows：
（1）Prepare β-semi-hydrated gypsum：Block ardealite is crushed to into below 5mm, is added equivalent to ardealite weight 2%
Calx grinding to 80 tm screens more than 12% together, after ageing neutralization reaction 24h, xeothermic dehydration is bakeed in 140 DEG C and makes β-half
Water stone cream, 97 DEG C of constant temperature are stand-by；
（2）Prepare β-semi-hydrated gypsum slip：Take obtained β -2000 grams of semi-hydrated gypsum powder；Take 10 grams of crystal seed agent（Crystal seed
Agent for β-semi-hydrated gypsum quality 0.5%）, and 10 grams of naphthalene sulfonates, 2 grams of Polyethylene Glycol and 2 grams of sodium tartrates（Add up to β-half
The 1.2% of water gypsum quality）It is uniformly dissolved as aqueous solution in adding 2000 grams of water（Water accounts for the 100% of β-semi-hydrated gypsum quality）, water
97 DEG C of temperature；β-semi-hydrated gypsum powder is added in aqueous solution and makes slip；
（3）Recrystallization prepares alpha-semi water plaster stone：Obtained slip is placed in closed kettle and is turned in 108 DEG C of constant temperature 2h recrystallization
Change is processed and makes alpha-semi water plaster stone；
（4）High strength gypsum is made：To take out after the alpha-semi water plaster stone slurry release of recrystallization in kettle, be placed in calorstat
After 105 DEG C of forced air dryings, grinding to 80 tm screens more than 3%, that is, make high strength gypsum powder.
Gypsum Fibrosum powder obtained by the present embodiment is carried out into performance test, after testing, its detection water requirement 41.6%, the presetting period 16
High strength gypsum powder is made 40 × 40 × 160mm test blocks, 3h intensity resistance to compression 26.7MPa, anti-folding by minute, final setting time 19 minutes
5.5MPa, 7d baked strength resistance to compression 34.6MPa, anti-folding 6.9MPa.
Embodiment 4
Gypsum raw material selects desulfurated plaster, alpha-semi water plaster stone powder crystal kind of the crystal seed agent in additive from preparation, additional
Recrystallization regulator in agent selects commercially available sulfamate（Water reducer）, PAFS and sodium succinate.
Alpha-semi water plaster stone is produced as follows：
（1）Prepare β-semi-hydrated gypsum：The desulfurated plaster of bulk is bakeed into xeothermic dehydration in 130 DEG C and makes β-semi-hydrated gypsum,
Rolling was broken to 120 mesh sieves, 97 DEG C of constant temperature；
（2）Prepare β-semi-hydrated gypsum slip：Will be obtained β -2000 grams of semi-hydrated gypsum powder and 50 grams of mixing of crystal seed agent equal
It is even（Crystal seed agent for β-semi-hydrated gypsum quality 2.5%）For mixed powder, by 16 grams of sulfamates, 5 grams of PAFSs and
3 grams of sodium succinates（Add up to the 1.2% of β-semi-hydrated gypsum quality）It is uniformly dissolved as aqueous solution in adding 1000 grams of water（Water account for β-
The 50% of semi-hydrated gypsum quality）, 97 DEG C of water temperature, will mixed powder add aqueous solution in make slip；
（3）Recrystallization prepares alpha-semi water plaster stone：By obtained slip in 98 DEG C of constant temperature 3h recrystallization conversion processings make α-
Semi-hydrated gypsum；
（4）High strength gypsum is made：The alpha-semi water plaster stone slurry of recrystallization is taken out, 105 DEG C of air blast in calorstat are placed in
After drying, grinding to 80 tm screens more than 3%, that is, make high strength gypsum powder.
Gypsum Fibrosum powder obtained by the present embodiment is carried out into performance test, after testing, its detection water requirement 36%, 14 points of presetting period
High strength gypsum powder is made 40 × 40 × 160mm test blocks, 3h intensity resistance to compression 36.7MPa, anti-folding by clock, final setting time 17 minutes
7.3MPa, 7d baked strength resistance to compression 53.2MPa, anti-folding 9.1MPa.
Embodiment 5
Gypsum raw material selects desulfurated plaster, alpha-semi water plaster stone powder crystal kind of the crystal seed agent in additive from preparation, additional
Recrystallization regulator in agent selects commercially available liquid melamine water reducer（Melamine sulfonate）, Alumen and sodium succinate.
Alpha-semi water plaster stone is produced as follows：
（1）Prepare β-semi-hydrated gypsum：Desulfurated plaster is bakeed into xeothermic dehydration in 130 DEG C and makes β-semi-hydrated gypsum, rolling is broken to
Cross 120 mesh sieves, 97 DEG C of constant temperature；
（2）Prepare β-semi-hydrated gypsum slip：Will be obtained β -2000 grams of semi-hydrated gypsum powder and 22 grams of mixing of crystal seed agent equal
It is even（Crystal seed agent for β-semi-hydrated gypsum quality 1.1%）For mixed powder, by 16 grams of melamines, 6 grams of Alumen and 2 grams of sodium succinates（Close
It is calculated as the 1.2% of β-semi-hydrated gypsum quality）It is uniformly dissolved as aqueous solution in adding 800 grams of water（Water accounts for β-semi-hydrated gypsum quality
40%）, 97 DEG C of water temperature, will mixed powder add aqueous solution in make slip；
（3）Recrystallization prepares alpha-semi water plaster stone：Obtained slip is placed in closed kettle in 128 DEG C of constant temperature 1.5h recrystallization
Conversion processing makes alpha-semi water plaster stone；
（4）High strength gypsum is made：After by the alpha-semi water plaster stone slurry release of recrystallization in kettle, 40 × 40 are poured into ×
High strength gypsum product is made in 160 die trials.
Gypsum Fibrosum powder obtained by the present embodiment is carried out into performance test, after testing, its detection water requirement 37%, 19 points of presetting period
Clock, final setting time 21 minutes, detection make 40 × 40 × 160mm high strength gypsum test blocks, 3h intensity resistance to compression 41.1MPa, anti-folding
7.9MPa, 7d baked strength resistance to compression 67.3MPa, anti-folding 11.8MPa.
Embodiment 6
Gypsum raw material selects desulfurated plaster, alpha-semi water plaster stone powder crystal kind of the crystal seed agent in additive from preparation, additional
Recrystallization regulator in agent selects commercially available sulfamate（Water reducer）, PAFS and sodium succinate.
Alpha-semi water plaster stone is produced as follows：
（1）Prepare β-semi-hydrated gypsum：The desulfurated plaster of bulk is bakeed into xeothermic dehydration in 130 DEG C and makes β-semi-hydrated gypsum,
Rolling was broken to 120 mesh sieves, 97 DEG C of constant temperature；
（2）Prepare β-semi-hydrated gypsum slip：By 40 grams of obtained β -2000 grams of semi-hydrated gypsum powder and crystal seed agent（Crystal seed agent
For the 2% of β-semi-hydrated gypsum quality）Mix homogeneously is mixed powder, by 16 grams of naphthalene sulfonates, 5 grams of PAFSs and 3 grams of fourths
Diacid sodium（Add up to the 1.2% of β-semi-hydrated gypsum quality）It is uniformly dissolved as aqueous solution in adding 1000 grams of water（Water accounts for β-half water stone
The 50% of cream quality）, 97 DEG C of water temperature, will mixed powder add aqueous solution in make slip；
（3）Recrystallization prepares alpha-semi water plaster stone：By obtained slip in 98 DEG C of constant temperature 3h recrystallization conversion processings make α-
Semi-hydrated gypsum；
（4）High strength gypsum is made：The alpha-semi water plaster stone slurry of recrystallization is taken out, 105 DEG C of air blast in calorstat are placed in
After drying, grinding to 80 tm screens more than 3%, that is, make high strength gypsum powder.
Gypsum Fibrosum powder obtained by the present embodiment is carried out into performance test, after testing, its detection water requirement 37%, 14 points of presetting period
High strength gypsum powder is made 40 × 40 × 160mm test blocks, 3h intensity resistance to compression 31.5MPa, anti-folding by clock, final setting time 17 minutes
6.7MPa, 7d baked strength resistance to compression 50.3MPa, anti-folding 8.9MPa.
Embodiment 7
Gypsum raw material selects desulfurated plaster, alpha-semi water plaster stone powder crystal kind of the crystal seed agent in additive from preparation, additional
Recrystallization regulator in agent selects commercially available powdery melamine water reducer（Melamine sulfonate）, powdery Alumen and succinic acid
Sodium.
Alpha-semi water plaster stone is produced as follows：
（1）Prepare β-semi-hydrated gypsum：Desulfurated plaster is bakeed into xeothermic dehydration in 130 DEG C and makes β-semi-hydrated gypsum, rolling is broken to
Cross 120 mesh sieves, 97 DEG C of constant temperature；
（2）Prepare β-semi-hydrated gypsum slip：By 22 grams of obtained β -2000 grams of semi-hydrated gypsum powder and crystal seed agent（Crystal seed agent
For the 1.1% of β-semi-hydrated gypsum quality）, 16 grams of melamine, 6 grams of Alumen and 2 grams of sodium succinates（Add up to β-semi-hydrated gypsum quality
1.2%）Mix homogeneously is mixed powder, is uniformly dissolved as aqueous solution in 800 grams of water that mixed powder is added 97 DEG C of water temperature（Water
Account for the 40% of β-semi-hydrated gypsum quality）, make slip.
（3）Recrystallization prepares alpha-semi water plaster stone：Obtained slip is placed in closed kettle in 128 DEG C of constant temperature 1.5h recrystallization
Conversion processing makes alpha-semi water plaster stone；
（4）High strength gypsum is made：After by the alpha-semi water plaster stone slurry release of recrystallization in kettle, 40 × 40 are poured into ×
High strength gypsum product is made in 160 die trials.
Gypsum Fibrosum powder obtained by the present embodiment is carried out into performance test, after testing, its detection water requirement 34.2%, the presetting period 19
Minute, final setting time 21 minutes, detection make 40 × 40 × 160mm high strength gypsum test blocks, 3h intensity resistance to compression 41.7MPa, anti-folding
7.9MPa, 7d baked strength resistance to compression 67.7MPa, anti-folding 11.9MPa.
Claims (10)
1. the method for alpha-semi water plaster stone being produced with β-semi-hydrated gypsum recrystallization, it is characterised in that comprise the steps：
（1）Prepare β-semi-hydrated gypsum：Dihydrate gypsum is made by β-semi-hydrated gypsum with xeothermic dewatering, will dihydrate gypsum exist
Parch or Gypsum Fibrosum preparata is sintered at a temperature of 107～200 DEG C, regrind and be fine into powder, obtain final product β-semi-hydrated gypsum powder；Or in original
After the Calx equivalent to dihydrate gypsum weight 1.5-3% is added in material dihydrate gypsum, then prepare β-semi-hydrated gypsum；
（2）Prepare β-semi-hydrated gypsum mixed slurry：
Prepare equivalent to step（1）The additive of gained β-semi-hydrated gypsum quality 0.3～5%, is prepared by following any one method
β-semi-hydrated gypsum mixed slurry：
Method one：Additive is soluble in water, the aqueous solution containing additive is configured to, by step（1）Gained β-semi-hydrated gypsum adds
Enter in the aqueous solution containing additive of temperature >=97 DEG C, make mixed slurry；
Method two：Will be a part of additive soluble in water, it is configured to the aqueous solution containing additive；By step（1）Gained β-half water
Gypsum Fibrosum is first premixed with another part additive for not being dissolved in water and is combined into homogeneous powder material, then uniform powder is added temperature >=97 DEG C
In aqueous solution containing additive, mixed slurry is made；
Method three：By step（1）Gained β-semi-hydrated gypsum is first premixed with whole additives and is combined into homogeneous powder material, then by uniform powder
In adding the water of temperature >=97 DEG C, mixed slurry is made；
In method one, two, three, the water content for controlling gained mixed slurry is step（1）The 25 of gained β-semi-hydrated gypsum quality～
250%；
The additive includes crystal seed and recrystallization regulator；
（3）Recrystallization prepares alpha-semi water plaster stone：By step（2）Obtained mixed slurry under 97 DEG C～160 DEG C of wet heat condition,
The dissolving-recrystallization of 0.5～5.0h of Jing, conversion processing make alpha-semi water plaster stone, obtain alpha-semi water plaster stone slip；
（4）Alpha-semi water plaster stone is made：By step（3）The alpha-semi water plaster stone Jing convection dryings of gained, grinding make α-half water stone
Cream powder；Or Jing centrifugations or filtering means dehydration, drying, grinding make alpha-semi water plaster stone powder；Or Jing atomization dryings make alpha-semi water plaster stone
Powder；
Or by step（3）The alpha-semi water plaster stone slip of gained direct moulding by casting when temperature is down to 80～99 DEG C is α-half water stone
Cream product, or Jing centrifuge dehydrations or filtration slough superfluous water moulding by casting for alpha-semi water plaster stone product.
2. the method that alpha-semi water plaster stone is produced with β-semi-hydrated gypsum recrystallization according to claim 1, it is characterised in that step
Suddenly（2）In, the addition of the additive is equivalent to step（1）Gained β-semi-hydrated gypsum quality 1.4～3.2%.
3. the method for producing alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization according to claim 1 and 2, its feature exist
In step（2）In, the water content for controlling gained mixed slurry is step（1）The 35～150% of gained β-semi-hydrated gypsum quality.
4. the method for producing alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization according to claim 1 and 2, its feature exist
In step（3）In, the time of dissolving-recrystallization is 1～3h.
5. the method for producing alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization according to claim 1 and 2, its feature exist
In step（1）In, the dihydrate gypsum is natural dihydrate gypsum and/or industry pair Gypsum Fibrosum.
6. the method that alpha-semi water plaster stone is produced with β-semi-hydrated gypsum recrystallization according to claim 5, it is characterised in that step
Suddenly（1）In, it is described industry pair Gypsum Fibrosum be ardealite or and desulfurated plaster.
7. the method for producing alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization according to claim 1 and 2, its feature exist
In the crystal seed is alpha-semi water plaster stone powder or alpha-semi water plaster stone powder crystal kind.
8. the method for producing alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization according to claim 1 and 2, its feature exist
In the recrystallization regulator is following at least one：Poly-dihydric alcohol, poly- trihydroxylic alcohol, polycarboxylic acids and its salt, tripolycyanamide sulphur
Hydrochlorate, LOMAR PWA EINECS 246-676-2 and its salt, sulfamate, alkylsulfonate, multicomponent organic acid and its salt, calcium, magnesium, aluminum, ferrum, lithium, sodium, potassium
Water solublity villaumite, sulfate and acylate.
9. the method for producing alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization according to claim 1 and 2, its feature exist
In the amount of seed in the additive for β-semi-hydrated gypsum quality 0.15～3%.
10. the method for producing alpha-semi water plaster stone with β-semi-hydrated gypsum recrystallization according to claim 1 and 2, its feature exist
In the recrystallization regulator in additive for β-semi-hydrated gypsum quality 0.025～2%.
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| CN107619060A (en) * | 2017-09-13 | 2018-01-23 | 重庆工商大学 | A kind of semi-hydrated gypsum nano wire, preparation method and applications |
| CN109574526A (en) * | 2018-12-26 | 2019-04-05 | 肇庆市珈旺环境技术研究院 | Method for preparing high-strength gypsum by desulfurization gypsum normal-pressure salt solution method |
| CN110683779B (en) * | 2019-11-18 | 2021-07-16 | 杭州归领医疗器械有限公司 | Preparation method of medical surgical alpha calcium sulfate hemihydrate |
| CN111003723B (en) * | 2019-12-18 | 2021-06-15 | 武汉工程大学 | Method for preparing alpha-semi-hydrated gypsum by using chemical gypsum and alpha-semi-hydrated gypsum prepared by same |
| CN113526539A (en) * | 2021-07-06 | 2021-10-22 | 贵州中建建筑科研设计院有限公司 | Preparation method of reference gypsum and application of reference gypsum in detection of additives |
| CN115231887B (en) * | 2022-08-01 | 2023-08-29 | 一夫科技股份有限公司 | Alpha-type semi-hydrated gypsum product with high smoothness and preparation method thereof |
| CN116553849B (en) * | 2023-04-06 | 2024-08-09 | 湖北工业大学 | Method for preparing regenerated alpha high-strength gypsum by using waste gypsum |
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| CN101372404A (en) * | 2008-07-24 | 2009-02-25 | 东南大学 | Method for preparing high-strength alpha type hemihydrate gypsum using desulphurized dihydrate gypsum |
| CN102745923A (en) * | 2011-04-22 | 2012-10-24 | 北京建筑材料科学研究总院有限公司 | Process for producing alpha type semi-hydrated gypsum by using industrial by-product gypsum |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101372404A (en) * | 2008-07-24 | 2009-02-25 | 东南大学 | Method for preparing high-strength alpha type hemihydrate gypsum using desulphurized dihydrate gypsum |
| CN102745923A (en) * | 2011-04-22 | 2012-10-24 | 北京建筑材料科学研究总院有限公司 | Process for producing alpha type semi-hydrated gypsum by using industrial by-product gypsum |
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