CN105217983B - A kind of method that semidry method produces high-strength αsemiwatergypsum - Google Patents
A kind of method that semidry method produces high-strength αsemiwatergypsum Download PDFInfo
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Abstract
A kind of method that semidry method produces high-strength αsemiwatergypsum, comprises the following steps：（1）Stock：Dihydrate gypsum is crushed to below particle diameter 5mm, or grinding is more than 80 tm screens<50% powder；Moisture content is made by modifying agent is soluble in water<95% modifier aqueous solution；（2）Preparation contains wet stock；（3）Damp and hot vexed steam of half dry type takes αsemiwatergypsum；（4）Dry；（5）It is made：By step（4）The αsemiwatergypsum material grinding that gained is dried is more than 80 tm screens<12% powder, produce high strength gypsum powder.Present invention process is simple, and equipment investment is smaller, and process parameter control is simple, can prevent β semi-hydrated gypsums, and product quality is easy to stable, can reduce the energy consumption of high strength gypsum to greatest extent, effectively reduce production cost.
Description
Technical field
The present invention relates to building material field, more particularly to a kind of damp and hot vexed steaming method of half dry type（Abbreviation semidry method）Produce height
The method of strong alpha-semi water plaster stone.
Background technology
At present, gypsum（Calcium sulfate）Existing state has dihydrate gypsum, semi-hydrated gypsum, III type anhydrous gypsum, II type anhydrous
Gypsum, I type anhydrous gypsum（Also referred to as α types anhydrous gypsum）, dihydrate gypsum and semi-hydrated gypsum therein are in metastable condition,
Under certain conditions can mutual inversion of phases, i.e. 1.5 water of the heated effusion 3/4 of hydrone between two sheaths of dihydrate gypsum
After molecule, Ca2+With SO4 2-Offset one from another and form semi-hydrated gypsum.Dihydrate gypsum formed under the conditions of different thermal dehydrations half
Water gypsum, without difference substantially in its microcosmic atomic order；But in its microstructure, atomic order crystallizes loose or fine and close
It is shown huge difference on macro property, thus have the extreme phase crystal formation under two α types, β types different dehydration conditions.
When dihydrate gypsum is under the conditions of pressurized steam or in the heated in water solution of acid and salt, i.e., take off in the liquid phase or under steam pressure
Water, then it can form alpha-semi water plaster stone.β-half can be then formed when dihydrate gypsum carries out thermal dehydration in a dry environment
Water gypsum.
Building gypsum plaster based on β-semi-hydrated gypsum mineral, fast solidifying big with water requirement（It generally needed to be added
Retarder）, volume microdilatancy, porosity is big, and poor water resistance, frost resistance is poor, low intensity, it is not wear-resisting the characteristics of, can only be used as room
Inner powder brush finish product, graphite product and plasterboard etc..
Gypsum based on alpha-semi water plaster stone is referred to as high strength gypsum, is that temperature of the 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 boils 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 that water requirement is small, condense and harden slower, volume stability, porosity and lightweight, intensity is good, wear-resisting
Etc. many excellent performance characteristics, except can be applied to paint, in addition to the high-grade material of plastering, many industries are applied also for,
Such as it is used as ceramic die, precision manufactureing, workmanship, gear division super hard gypsum, engineering plastics and rubber and gypsum base certainly
Levelling 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 of application
Have：
1）Saturated vapor pressurization：Referred to as " autoclave method ", it is that the dihydrate gypsum of the block grain of certain particle diameter is placed in steam pressure
In kettle, saturated vapor is passed through, certain time is steamed in 110~170 DEG C of temperature pressures, dihydrate gypsum is slowly dehydrated and be changed into α-half
Water gypsum, then through dry and grinding, produce alpha type high-strength gypsum.Its shortcoming is that the dischargeable capacity utilization rate of still kettle is low, energy consumption
High, low production efficiency.
2）Normal pressure salt solustion mehtod：Substantially utilize sulfate between or the cocrystallization characteristic between sulfate and villaumite,
It is in atmospheric conditions, levigate dihydrate gypsum powder to be placed in saline solution（The quality of salt used in cocrystallization is dihydrate gypsum
More than the 15% of quality）In boil certain time after, then filtered, washed（Remove the salt of cocrystallization）, dry, 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 prepared
Brilliant degree is poor, and desalination and dry difficulty are big.
3）Hydro-thermal method：It is by powdery dihydrate gypsum and the water added with crystal modifier including static hydrothermal method and Dynamic Hydrothermal method
Solution mixed slurry（Moisture content 50~80%）It is placed in reactor, the pressure boiling through certain time is converted into alpha-semi water plaster stone,
Again through press filtration or centrifugal dehydration, dry, high strength gypsum powder is made in grinding.This method can produce high-strength（Dry compression 25~
50MPa）It is strong with superelevation（More than dry compression 50MPa）Grade land plaster, but high is required to grade of gypsum, and complex process, it is raw
Production efficiency is low, and production capacity is smaller, high energy consumption, and cost is high.
4）Compromise method：Compromise method or combination method between steam pressure and hydro-thermal method, are in levigate powder gypsum
Addition contains carboxyl（COO- the carboxylic acid salt solution of low molecule amount) such as maleic acid, sodium citrate etc., pressurize in closed container
（0.2~0.5Mpa）, hydro-thermal stirring 1~3h of boiling, it is levigate to be made then after 1~2h of constant pressure and dry at a temperature of 100~160 DEG C
High strength gypsum powder.This method energy consumption is still higher, cost is high.
5）Do vexed method：It is that dihydrate gypsum is placed in the steam pressure Fu with spacer of sealing to heat, with part dihydrate gypsum
The xeothermic crystallization water taken off forms high-temperature water vapor and pressure steaming dehydration is carried out to remaining dihydrate gypsum.Do vexed method energy consumption relative to
It is minimum for autoclave method, hydro-thermal method, salting liquid cocrystallization method and compromise method, still, first need to set using the still kettle of jacketed
Standby, efficiency is relatively low, and equipment investment is higher, and production cost is higher, and second its product mineral is β-semi-hydrated gypsum and alpha-semi water plaster stone
Mixture, and composition fluctuation is big, low strength（Typically in 10~20MPa）.
In summary, it is the energy consumption of reduction high strength gypsum, improve production efficiency, reduces equipment investment and be produced into
This, and the metastable high strength gypsum of quality is obtained, it is necessary to a kind of brand-new process for producing alpha-semi water plaster stone.
The content of the invention
The technical problems to be solved by the invention are overcome the deficiencies in the prior art, there is provided a kind of technique is simple, and equipment is thrown
Money is smaller, and process parameter control is simple, can prevent β-semi-hydrated gypsum, and product quality is easy to stable, can be to greatest extent
Energy consumption is reduced, effectively reduces the method that the semidry method of production cost produces high-strength alpha-half hydrated gypsum.
It is that a kind of semidry method produces the side of high-strength alpha-half hydrated gypsum that the present invention, which solves the technical scheme that its technical problem uses,
Method, using directly-heated type reactor, with particle diameter<The 5mm aqueous solution of dihydrate gypsum bulk goods or the powder absorption containing modifying agent, absorption
Have the dihydrate gypsum of modifying agent containing wet stock be placed in directly-heated type reactor at a temperature of 108 DEG C~170 DEG C it is damp and hot it is vexed steam 1~
5h, then unload and be depressed into atmospheric pressure, be quickly evaporated in 100~115 DEG C of kettles, high strength gypsum powder is made through grinding, it is main include with
Lower step：
（1）Stock：Dihydrate gypsum is crushed to below particle diameter 5mm, or grinding is more than 80 tm screens<50% powder；Or
After the lime equivalent to dihydrate gypsum weight 1.5-3% is added in raw material dihydrate gypsum, mixing ageing 2-5 days, then carry out
Break process；Moisture content is made by modifying agent is soluble in water<95% modifier aqueous solution；
（2）Preparation contains wet stock：By step（1）The dihydrate gypsum bulk goods or powder of gained mix with modifier aqueous solution
Close, adsorbed through the ageing of more than 15 minutes, moisture content is made<20% contains wet stock；
（3）Damp and hot vexed steam of half dry type takes alpha-semi water plaster stone：By step（2）Gained is placed in directly-heated type reaction containing wet stock
In kettle, in 108 DEG C~170 DEG C 1~5h of damp and hot vexed steaming, alpha-semi water plaster stone is made；
（4）Dry：By step（3）Directly-heated type reactor pressure-relief valve open, material in kettle is communicated with air, in kettle
Interior 100~115 DEG C are quickly evaporated rear discharging, obtain dry alpha-semi water plaster stone material；
（5）It is made：By step（4）The alpha-semi water plaster stone material grinding that gained is dried is more than 80 tm screens<12% powder,
Produce high strength gypsum powder.
Further, step（1）In, the dihydrate gypsum refers to natural dihydrate gypsum and/or industry byproduct dihydrate gypsum, such as
Ardealite, desulfurated plaster.
Further, step（1）In, the modifying agent includes Interfacial Adsorption modifying agent（That is particle surface modifier）And crystal formation
Modifying agent；Interfacial Adsorption modifying agent therein is polymerization Ludox and/or sodium metaaluminate etc., and dosage is raw material dihydrate gypsum quality
0.05~0.95%（It is preferred that 0.2~0.95%, more preferably 0.6~0.9%）；Wherein habit modifier, for adjusting half water stone
The dissolving crystallized habit of cream, preferably polyglycerol, polyglycol ether, polycarboxylate based water reducer, melamine based water reducer, naphthalene sulfonic acids
At least one of salt based water reducer, sulfamate water reducer, binary and multicomponent organic acid and its salt etc., crystalline form modifying agent are
The 0.025~1.25% of raw material dihydrate gypsum quality（It is preferred that 0.1~1.2%, more preferably 0.4~1.0%）.
Further, the directly-heated type reactor refer to bottom can direct-fired vertical response kettle or can forward and reverse rotation turn
Cartridge type reactor etc..
The technical principle of the present invention：
1）It is this with Ca for dihydrate gypsum and semi-hydrated gypsum2+、[SO4]2-Represent that feature is adsorbed in face for the particle of conjugate,
From polymerization Ludox and/or sodium metaaluminate as adsorption modifying agent, on the one hand, strengthen dihydrate gypsum and semi-hydrated gypsum pair
Effective absorption of habit modified dose of polymer crystallization, strengthen the modified effect of habit modifier, on the other hand, adsorption is modified
Agent cooperates with effective crystal growth for adjusting semi-hydrated gypsum because it adsorbs interface modification, meanwhile, changed with the silicon of particle surface/aluminium absorption
Property improve the water-resistance of gypsum, collaboration promotes the dissolving crystallized short cylinder good for compact structure, crystallization degree of dihydrate gypsum dehydration
Alpha-semi water plaster stone.
2）According to crystallization kinetics principle, change half with suitable adsorption modifying agent and crystal habit adjustment modifying agent
The speed of growth of C direction of principal axis in water gypsum crystal growth course, it is short cylinder α-half water to make two water water gypsum dehydrations dissolving crystallized
The sturdy crystal of gypsum.
3）With the smaller share containing wet stock（<20%) appropriate physics moisture content is provided needed for the vexed steaming of directly-heated type reactor
Primary steam, can both prevent from doing β-semi-hydrated gypsum caused by vexed method and occur, heat consumption can be saved again.
4）The macromolecule modifier of compounding is added, dissolving crystallized process had both been adjusted, alpha-semi water plaster stone can be improved again（High-strength stone
Cream）The construction usage performance and material property of powder.
5）Conventional steam pressure is reduced with the damp and hot vexed steaming processing of directly-heated type reactor half dry type to greatest extent and is blown into steam energy
Heat loss in transfer process, and required heat is reduced, meanwhile, drying process can be simplified, utilize the existing storage of material in kettle
Continue waste heat supply outside heat and kettle, reduce energy consumption for drying to greatest extent, reduce further drying equipment investment and production energy
Consumption.
Beneficial effects of the present invention：
1）The damp and hot vexed steaming method of half dry type（Referred to as " semidry method "）Open a kind of brand-new technique for producing alpha-semi water plaster stone
Method, technique is simple, and equipment investment is smaller, and process parameter control is simple, can prevent β-semi-hydrated gypsum, and product quality is easy to
It is stable, the energy consumption of high strength gypsum can be reduced to greatest extent, effectively reduce production cost.
2）Beneficial to because of the suitable utilization natural gypsum of feelings and the secondary gypsum of industry（Waste gypsum）Produce high-strength high-quality gypsum system
Product, beneficial to mitigation environmental pollution and environmental protection.
3）The research and development of gypsum industry can be promoted, promote the modification and application of gypsum material.
Embodiment
Stated below in conjunction with specific embodiment is further to the present invention.
Following experiments are carried out in laboratory conditions, and experiment uses volume 2500ml directly-heated type vertical response kettle.Experiment
Detection according to《Plaster of Paris ordinary test condition》（GB/T17669.1-1999）Defined condition is carried out.Dihydrate gypsum selects day
Right dihydrate gypsum, ardealite, desulfurated plaster；Interfacial Adsorption modifying agent in modifying agent from commercially available polymerization Ludox and/or
Sodium metaaluminate；Dissolving crystallized habit habit modifier in modifying agent is from commercially available polyglycerol, polyglycol ether, carboxylate
Based water reducer, melamine based water reducer, naphthalene sulfonate based water reducer, sulfamate water reducer, binary and multicomponent organic acid and its
Salt.
Embodiment 1
Gypsum raw material selects natural dihydrate gypsum, and the particle surface modifier in modifying agent selects sodium metaaluminate, modifying agent
In dissolving crystallized habit adjustment with habit modifier select commercially available powdery melamine water reducer, polyglycerol and glutaric acid
Sodium.Alpha-semi water plaster stone is produced with semidry method as follows：
（1）Stock：2000g dihydrate gypsums are crushed to below particle diameter 2mm；By particle surface modifier sodium metaaluminate 18g
（For the 0.9% of dihydrate gypsum quality）, habit modifier melamine water reducer 8g, polyglycerol 1g and Sodium glutarate 1g（Add up to two
The 0.5% of water gypsum quality）It is dissolved in the modifier aqueous solution 178g that moisture content 84.3% is made in 150g water；
（2）Preparation contains wet stock：By step（1）Below gained particle diameter 2mm dihydrate gypsum bulk goods 2000g and modifying agent
Aqueous solution 178g is mixed, and is adsorbed through the ageing of 30 minutes, moisture content 6.9% is made contains wet stock；
（3）Damp and hot vexed steam of half dry type takes alpha-semi water plaster stone：By step（2）Gained is placed in directly-heated type reaction containing wet stock
In kettle, closed reactor, in 118 DEG C of damp and hot vexed steaming 3h, alpha-semi water plaster stone is made；
（4）Dry：The pressure-relief valve of directly-heated type reactor is opened, material in kettle is communicated with air, it is quick in 105 DEG C in kettle
Rear discharging is evaporated, obtains dry alpha-semi water plaster stone material；
（5）It is made：By step（4）The powder that it is 3% more than 80 tm screens that the alpha-semi water plaster stone material grinding that gained is dried, which is,
Produce high strength gypsum powder.
High strength gypsum powder obtained by the present embodiment, after testing, its water requirement are 36%, 17 minutes presetting periods, final setting time 19
Minute, 40*40*160mm test blocks, 3h intensity resistance to compressions 32.6MPa, anti-folding 7.6MPa is made in high strength gypsum powder, 7d intensity resists
Press 53.6MPa, anti-folding 9.6MPa.
Embodiment 2
Gypsum raw material selects natural dihydrate gypsum, and the particle surface modifier in modifying agent is modified from polymerization Ludox
Dissolving crystallized habit adjustment in agent is selected commercially available powdery sodium naphthalene sulfonate water reducer, polyglycol ether with habit modifier, gathered
Close glycerine.Alpha-semi water plaster stone is produced with semidry method as follows：
（1）Stock：By 2000g dihydrate gypsums are broken, grinding be 18% more than 80 tm screens powder；Particle surface is changed
Property agent polymerization Ludox 18g（For the 0.9% of dihydrate gypsum quality）, habit modifier sodium naphthalene sulfonate water reducer 10g, polyethylene glycol
Ether 1g, polyglycerol 1g（Add up to the 0.6% of dihydrate gypsum quality）It is dissolved in 200g water, the modifying agent of moisture content 86.9% is made
Aqueous solution 230g；
（2）Preparation contains wet stock：By step（1）The dihydrate gypsum powder 2000g and modifier aqueous solution 230g of gained are mixed
Close, adsorbed through the ageing of 50 minutes, it is 9.0% to contain wet stock that moisture content, which is made,；
（3）Damp and hot vexed steam of half dry type takes alpha-semi water plaster stone：By step（2）Gained is placed in directly-heated type reaction containing wet stock
In kettle, closed reactor, in 128 DEG C of damp and hot vexed steaming 2h, alpha-semi water plaster stone is made；
（4）Dry：The pressure-relief valve of reactor is opened, material in kettle is communicated with air, after 110 DEG C in kettle are quickly evaporated
Discharging, obtain dry alpha-semi water plaster stone material；
（5）It is made：By step（4）The powder that it is 3% more than 80 tm screens that the alpha-semi water plaster stone material grinding that gained is dried, which is,
Produce high strength gypsum powder.
High strength gypsum powder obtained by the present embodiment, after testing, it detects water requirement 38%, 14 minutes presetting periods, final setting time
18 minutes, 40*40*160mm test blocks, 3h intensity resistance to compressions 27.7MPa, anti-folding 5.6MPa, 7d intensity is made in high strength gypsum powder
Resistance to compression 48.7MPa, anti-folding 9.0MPa.
Embodiment 3
Gypsum raw material selects ardealite, and the particle surface modifier in modifying agent is from polymerization Ludox, in modifying agent
Dissolving crystallized habit adjustment is sweet from commercially available liquid sulfamate water reducer, polyglycol ether, polymerization with habit modifier
Oil.Alpha-semi water plaster stone is produced with semidry method as follows：
（1）Stock：2000g is dissipated into lime of the granular phosphogypsum addition equivalent to ardealite weight 2%（40g）Mixing ageing 3
Then it is rolled over and is broken to below particle diameter 2mm to neutralize the soluble phosphate and fluorophosphate in ardealite；By particle surface modification
Agent polymerization Ludox 16g（For the 0.8% of phosphogypsum quality）, habit modifier sulfamate water reducer 12g, polyglycerol 1g,
Polyglycol ether 1g（Add up to the 0.7% of phosphogypsum quality）It is dissolved in the modifier aqueous solution that moisture content 87.0% is made in 200g water
230g；
（2）Preparation contains wet stock：By step（1）The ardealite 2040g and modifier aqueous solution 230g of the neutralization of gained are mixed
Close, adsorbed through the ageing of 60 minutes, moisture content 8.8% is made contains wet stock；
（3）Damp and hot vexed steam of half dry type takes alpha-semi water plaster stone：By step（2）Gained is placed in directly-heated type reaction containing wet stock
In kettle, closed reactor, in 150 DEG C of damp and hot vexed steaming 1h, alpha-semi water plaster stone is made；
（4）Dry：The pressure-relief valve of reactor is opened, material in kettle is communicated with air, after 110 DEG C in kettle are quickly evaporated
Discharging, obtain dry alpha-semi water plaster stone material；
（5）It is made：By step（4）The powder that it is 3% more than 80 tm screens that the alpha-semi water plaster stone material grinding that gained is dried, which is,
Produce high strength gypsum powder.
High strength gypsum powder obtained by the present embodiment, after testing, it detects water requirement 42%, 13 minutes presetting periods, final setting time
17 minutes, 40*40*160mm test blocks, 3h intensity resistance to compressions 24.3MPa, anti-folding 4.8MPa, 7d intensity is made in high strength gypsum powder
Resistance to compression 36.7MPa, anti-folding 7.3MPa.
Embodiment 4
For gypsum raw material from the shot shape desulfurated plaster spontaneously dried, the particle surface modifier in modifying agent selects inclined aluminium
Sour sodium, the dissolving crystallized habit adjustment in modifying agent is with habit modifier from commercially available polycarboxylate dehydragent, polyethylene glycol
Ether, polyglycerol.Alpha-semi water plaster stone is produced with semidry method as follows：
（1）Stock：Take 2000g desulfurated plasters（Below particle diameter 4mm）；By particle surface modifier sodium metaaluminate 12g（It is de-
The 0.6% of sulphur gypsum quality）, habit modifier polycarboxylate dehydragent 12g, polyglycol ether 0.5g, polyglycerol 0.5g（Close
It is calculated as the 0.65% of desulfurated plaster quality）It is dissolved in the modifier aqueous solution 200g that moisture content 87.5% is made in 175g water；
（2）Preparation contains wet stock：By step（1）Desulfurated plaster 2000g mixed with modifier aqueous solution 200g, through 30 points
The ageing absorption of clock, moisture content 7.95% is made contains wet stock；
（3）Damp and hot vexed steam of half dry type takes alpha-semi water plaster stone：Wet stock will be contained to be placed in directly-heated type reactor, confined reaction
Kettle, in 118 DEG C of damp and hot vexed steaming 2.5h, alpha-semi water plaster stone is made；
（4）Dry：The pressure-relief valve of reactor is opened, material in kettle is communicated with air, at 110 DEG C in being quickly evaporated in kettle
Discharging afterwards, obtain dry alpha-semi water plaster stone material；
（5）It is made：By step（4）The powder that it is 3% more than 80 tm screens that the alpha-semi water plaster stone material grinding that gained is dried, which is,
Produce high strength gypsum powder.
High strength gypsum powder obtained by the present embodiment, after testing, it detects water requirement 38.7%, when 18 minutes presetting periods, final set
Between 21 minutes, 40*40*160mm test blocks are made in high strength gypsum powder, 3h intensity resistance to compressions 35.9MPa, anti-folding 6.8MPa, 7d are strong
Spend resistance to compression 53.7MPa, anti-folding 9.5MPa.
Embodiment 5
For gypsum raw material from the shot shape desulfurated plaster spontaneously dried, the particle surface modifier in modifying agent selects inclined aluminium
Sour sodium, the dissolving crystallized habit adjustment in modifying agent is with habit modifier from commercially available naphthalene sulfonate water reducer, polyethylene glycol
Ether and Sodium glutarate.Alpha-semi water plaster stone is produced with semidry method as follows：
（1）Stock：Take 2000g desulfurated plasters（Below particle diameter 3mm）；By particle surface modification sodium metaaluminate 12g（For desulfurization
The 0.6% of gypsum quality）, habit modifier naphthalene sulfonate water reducer 15g, polyglycol ether 1g, Sodium glutarate 2g（Add up to de-
The 0.9% of sulphur gypsum quality）It is dissolved in the modifier aqueous solution 230g that moisture content 87.0% is made in 200g water；
（2）Preparation contains wet stock：By step（1）Desulfurated plaster 2000g mixed with modifier aqueous solution 230g, through 30 points
The ageing absorption of clock, moisture content 9.0% is made contains wet stock；
（3）Damp and hot vexed steam of half dry type takes alpha-semi water plaster stone：By step（2）Gained is placed in directly-heated type reaction containing wet stock
In kettle, closed reactor, in 110 DEG C of damp and hot vexed steaming 4h, alpha-semi water plaster stone is made；
（4）Dry：The pressure-relief valve of reactor is opened, material in kettle is communicated with air, at 110 DEG C in being quickly evaporated in kettle
Discharging afterwards, obtain dry alpha-semi water plaster stone material；
（5）It is made：By step（4）The powder that it is 3% more than 80 tm screens that the alpha-semi water plaster stone material grinding that gained is dried, which is,
Produce high strength gypsum powder.
High strength gypsum powder obtained by the present embodiment, after testing, it detects water requirement 35.1%, when 17 minutes presetting periods, final set
Between 19 minutes, 40*40*160mm test blocks are made in high strength gypsum powder, 3h intensity resistance to compressions 38.7MPa, anti-folding 7.3MPa, 7d are strong
Spend resistance to compression 67.4MPa, anti-folding 11.3MPa.
Claims (8)
1. a kind of method that semidry method produces high-strength alpha-half hydrated gypsum, it is characterised in that comprise the following steps：
（1）Stock：Dihydrate gypsum is crushed to below particle diameter 5mm, or grinding is more than 80 tm screens<50% powder；Or in original
Expect after the lime equivalent to dihydrate gypsum weight 1.5-3% is added in dihydrate gypsum, mixing ageing 2-5 days, then crushed
Processing；Moisture content is made by modifying agent is soluble in water<95% modifier aqueous solution；
The modifying agent includes Interfacial Adsorption modifying agent and habit modifier；
The Interfacial Adsorption modifying agent is polymerization Ludox and/or sodium metaaluminate；
The habit modifier, it is polyglycerol, polyglycol ether, polycarboxylate based water reducer, melamine based water reducer, naphthalene sulfonic acids
At least one of salt based water reducer, sulfamate water reducer, multicomponent organic acid and its salt；
（2）Preparation contains wet stock：By step（1）The dihydrate gypsum bulk goods or powder of gained mix with modifier aqueous solution, warp
The ageing absorption of more than 15 minutes, is made moisture content<20% contains wet stock；
（3）Damp and hot vexed steam of half dry type takes alpha-semi water plaster stone：By step（2）Gained is placed in directly-heated type reactor containing wet stock
It is interior, in 108 DEG C~170 DEG C 1~5h of damp and hot vexed steaming, alpha-semi water plaster stone is made；
（4）Dry：By step（3）Directly-heated type reactor pressure-relief valve open, material in kettle is communicated with air, in kettle
100~115 DEG C are quickly evaporated rear discharging, obtain dry alpha-semi water plaster stone material；
（5）It is made：By step（4）The alpha-semi water plaster stone material grinding that gained is dried is more than 80 tm screens<12% powder, is produced
High strength gypsum powder.
2. the method that semidry method according to claim 1 produces high-strength alpha-half hydrated gypsum, it is characterised in that step（1）In,
The dihydrate gypsum refers to natural dihydrate gypsum and/or industry byproduct dihydrate gypsum.
3. the method that semidry method according to claim 2 produces high-strength alpha-half hydrated gypsum, it is characterised in that the industry is secondary
Product dihydrate gypsum is ardealite and/or desulfurated plaster.
4. the method that semidry method according to claim 1 or 2 produces high-strength alpha-half hydrated gypsum, it is characterised in that step（1）
In, the Interfacial Adsorption amount of modifier is the 0.05~0.95% of raw material dihydrate gypsum quality.
5. the method that semidry method according to claim 3 produces high-strength alpha-half hydrated gypsum, it is characterised in that step（1）In,
The Interfacial Adsorption amount of modifier is the 0.05~0.95% of raw material dihydrate gypsum quality.
6. the method that semidry method according to claim 1 or 2 produces high-strength alpha-half hydrated gypsum, it is characterised in that step（1）
In, the habit modifier dosage is the 0.025~1.25% of raw material dihydrate gypsum quality.
7. the method that semidry method according to claim 3 produces high-strength alpha-half hydrated gypsum, it is characterised in that step（1）In,
The habit modifier dosage is the 0.025~1.25% of raw material dihydrate gypsum quality.
8. the method that semidry method according to claim 1 or 2 produces high-strength alpha-half hydrated gypsum, it is characterised in that step（1）
In, the directly-heated type reactor refer to bottom can direct-fired vertical response kettle or can forward and reverse rotation drum-type reactor.
Priority Applications (1)
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| CN110627389A (en) * | 2019-10-25 | 2019-12-31 | 河南建筑材料研究设计院有限责任公司 | Production process of alpha high-strength gypsum |
| CN111320446B (en) * | 2020-02-29 | 2022-10-21 | 湖北省建筑工程质量监督检验测试中心 | High-strength self-waterproof phosphogypsum roadbed material and preparation method thereof |
| 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 |
| CN113480210A (en) * | 2021-08-20 | 2021-10-08 | 河南永泰石膏有限公司 | Process for producing alpha high-strength gypsum powder by using industrial byproduct gypsum |
| CN116692920A (en) * | 2023-07-21 | 2023-09-05 | 昆明川金诺化工股份有限公司 | Production method and production system of low free water dihydrate phosphogypsum |
| CN117682539B (en) * | 2024-02-04 | 2024-04-19 | 北京康仑循环科技有限公司 | Method for producing sodium carbonate and high-strength gypsum by using calcium carbonate and sodium sulfate as raw materials |
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| 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 |
| CN104628274A (en) * | 2014-12-03 | 2015-05-20 | 昆明理工大学 | Method and device for preparing high-strength alpha hemihydrate gypsum by using phosphogypsum |
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| 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 |
| CN104628274A (en) * | 2014-12-03 | 2015-05-20 | 昆明理工大学 | Method and device for preparing high-strength alpha hemihydrate gypsum by using phosphogypsum |
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