CN108059375A - A kind of method that the compound semi-hydrated gypsum of alpha-beta is prepared with ardealite - Google Patents
A kind of method that the compound semi-hydrated gypsum of alpha-beta is prepared with ardealite Download PDFInfo
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- CN108059375A CN108059375A CN201711303247.0A CN201711303247A CN108059375A CN 108059375 A CN108059375 A CN 108059375A CN 201711303247 A CN201711303247 A CN 201711303247A CN 108059375 A CN108059375 A CN 108059375A
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- semi
- ardealite
- alpha
- gypsum
- hydrated
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 75
- 239000010440 gypsum Substances 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 34
- 150000001875 compounds Chemical class 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 239000013078 crystal Substances 0.000 claims abstract description 27
- 150000004683 dihydrates Chemical class 0.000 claims abstract description 17
- 230000018044 dehydration Effects 0.000 claims abstract description 14
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 14
- 239000003607 modifier Substances 0.000 claims abstract description 14
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 11
- 239000004575 stone Substances 0.000 claims description 28
- 239000011505 plaster Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate group Chemical group S(=O)(=O)([O-])[O-] QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims 1
- 159000000013 aluminium salts Chemical class 0.000 claims 1
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims 1
- 229910017604 nitric acid Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000011507 gypsum plaster Substances 0.000 abstract 1
- 238000004064 recycling Methods 0.000 abstract 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 12
- 239000011574 phosphorus Substances 0.000 description 8
- 229910052698 phosphorus Inorganic materials 0.000 description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052925 anhydrite Inorganic materials 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 239000006071 cream Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000002609 medium Substances 0.000 description 3
- 150000003017 phosphorus Chemical class 0.000 description 3
- 229920002338 polyhydroxyethylmethacrylate Polymers 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002686 phosphate fertilizer Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 238000011074 autoclave method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000003682 fluorination reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052705 radium Inorganic materials 0.000 description 1
- HCWPIIXVSYCSAN-UHFFFAOYSA-N radium atom Chemical compound [Ra] HCWPIIXVSYCSAN-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- DNYWZCXLKNTFFI-UHFFFAOYSA-N uranium Chemical compound [U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U][U] DNYWZCXLKNTFFI-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/032—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the wet process, e.g. dehydrating in solution or under saturated vapour conditions, i.e. to obtain alpha-hemihydrate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
- C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
- C04B11/036—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the dry process, e.g. dehydrating in a fluidised bed or in a rotary kiln, i.e. to obtain beta-hemihydrate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Building Environments (AREA)
Abstract
The present invention relates to a kind of methods that the compound semi-hydrated gypsums of α β are prepared with ardealite, comprise the following steps：（1）αsemiwatergypsum is put into after ardealite and crystal modifier, crystal seed are sufficiently mixed to turn in brilliant case, with sub-saturated air preheat, atmospheric steam is then passed to and maintains temperature and humidity, realizes that part dihydrate gypsum is converted into αsemiwatergypsum in ardealite；（2）It is passed through hot-air and carries out predrying；（3）Further dehydration, makes the dihydrate gypsum not being dehydrated be converted into β semi-hydrated gypsums, is the compound semi-hydrated gypsums of α β.The compound semi-hydrated gypsums of α β prepared by the method are compared with conventional beta semi-hydrated gypsum, consumptive use of water normal consistence is few, intensity is high, compared with αsemiwatergypsum, it is not required to high pressure dehydration equipment and hydrothermal condition, so production process is mild, equipment is simple, low energy consumption, product is widely used as building gypsum plaster or the various types of gypsum blocks of production, and a kind of practicable technical method is provided for the recycling of ardealite.
Description
Technical field
The present invention relates to a kind of methods that the compound semi-hydrated gypsum of alpha-beta is prepared with ardealite, belong to construction material technology of preparing
Field.
Background technology
In high concentration phosphate fertilizer production process, phosphoric acid is generated using phosphorus ore and sulfuric acid reaction, the calcium sulfate of by-product is usually referred to as
For ardealite.Ardealite appearance be yellow-white, light gray-white or fine blackish-gray powder shape solid, main component CaSO4·nH2O,
Its mass fraction is similar to the natural gypsum usually more than 85%；Generally contain free water 20~30%.According to Wet-process Phosphoric Acid Production
The difference of technique, phosphogypsum crystal have two water objects（CaSO4·nH2O）, half water object（CaSO4·0.5H2O）Etc. forms, at present it is wet
Method phosphoric acid production is in the majority with two water object techniques, therefore the main component of ardealite is CaSO4·nH2O, also containing phosphorus, fluorine, oxidation
The secondary composition such as silicon, aluminium oxide, iron oxide, uranium, radium, cadmium, lead, copper and organic matter often produces 1 ton of phosphoric acid（With 100%P2O5Meter
It calculates）About 4.5~5 tons of ardealites of by-product, pH value be about 1.5~3.5, wherein Leaching Properties of Soluble Phosphorus and fluorine be cause environmental pollution it is main because
Element, the semi-hydrated gypsum that eutectic phosphorus is prepared in ardealite add during water is converted into dihydrate gypsum, seriously affect dihydrate gypsum
Crystal habit is the main reason for ardealite is caused to be difficult to be utilized effectively in traditional architecture field, therefore, the money of ardealite
It is still a global problem that sourceization, which utilizes,.Also it is one of key factor for restricting phosphorus chemical industry sustainable development.
Dihydrate gypsum can be converted into semi-hydrated gypsum under heating state, when dihydrate gypsum in steam under pressure or is having acid, salt
Medium in when heating, alpha-semi water plaster stone can be changed into, and then generate β-semi-hydrated gypsum during thermal dehydration under dry environment,
Therefore α, beta-type semi-hydrated gypsum are two kinds of extreme crystal forms of gypsum, although the two in atomic order without essential distinction, its atom
The loose or compactness of structural order makes it macroscopically generate greatest differences.
At present, alpha-semi water plaster stone production method mainly has：Autoclave method, hydro-thermal method, the molten method of normal pressure salt, dry blowing method etc., respectively have
Pros and cons, but in general, no matter using which kind of method, for obtain alpha-semi water plaster stone or in high-tension apparatus dehydration or
It is dehydrated in solution, such as：CN201510845093.2 is disclosed a kind of produces alpha-semi water plaster stone+β semi-hydrated gypsums+admant with ardealite
Method of the cream as filler production PVC profile, CN201510667340.4 disclose a kind of semidry method and produce high-strength α-half water stone
The method of cream, CN201210552607.1 disclose that a kind of that Mud-slag modified ardealite is utilized to be prepared for constant pressure hydro-thermal method is high
The method of strong alpha semi-hydrated gypsum, CN201110101252.X disclose a kind of utilization industry by-product gypsum and produce alpha semi-hydrated gypsum
Process, CN201210226224.5 discloses a kind of process of low-temp low-pressure production α-type semi-hydrated gypsum powder,
CN200810121470.8 discloses the method that desulfurated plaster is converted into alpha-semi water plaster stone in normal pressure KCl solution.
But in existing alpha-semi water plaster stone preparation method, do not have also using 100 DEG C of temperature ＜, under sub-saturated steam and be dehydrated
Report.
The content of the invention
The purpose of the present invention is to overcome the deficiency of the prior art, providing, a kind of equipment is simple, production technology is soft, energy consumption
Low technical method, the alpha-beta that building gypsum and gypsum block physicochemical property requirement can be met using ardealite as raw material production are compound
Semi-hydrated gypsum.
The present invention completes by the following technical programs：
A kind of method that the compound semi-hydrated gypsum of alpha-beta is prepared with ardealite, is as follows：
（1）Alpha-semi water plaster stone is put into after ardealite and crystal modifier, crystal seed are sufficiently mixed to turn in brilliant case, is carried out with sub-saturated air
Preheating when turning brilliant 60 DEG C of box temperature degree ＞, is passed through atmospheric steam to maintain certain temperature and humidity, realizes part two in ardealite
Water gypsum is converted into alpha-semi water plaster stone；
（2）It after completing the brilliant operation of alpha-semi water plaster stone turn, is passed through hot-air and carries out predrying, make material attachment water content ＜ 5%；
（3）It is further dehydrated through pre-dried material, the dihydrate gypsum not being dehydrated is made to be converted into β-semi-hydrated gypsum to get described
The compound semi-hydrated gypsum of alpha-beta.
The ardealite is directly used without any processing, and adhesive water content is in 10-25%, pH value 2.5-5.0；
The crystal modifier is sulfate, hydrochloride or the nitrate of aluminium, and crystal seed is commercially available high-strength alpha-half hydrated gypsum, crystal modifier and crystalline substance
Kind granularity was the powder of 180 mesh square hole screen screen over-size ＜ 5%, and crystal modifier additive amount is the 0.2-0.5wt% of ardealite butt,
Seed load is the 1-2wt% of ardealite butt；
It is square or circular configuration, the narrow meshed air hose of sole arrangement and distribution of steam pipe number that the alpha-semi water plaster stone, which turns brilliant case,
Root, top installation temperature monitor, thermometer and blow vent；
Step（1）Sub-saturated air themperature used is 80-100 DEG C during middle preheating, humidity 80-90%；
Step（1）In be passed through atmospheric steam heating, it is 85-100 DEG C, humidity 85-95% that alpha-semi water plaster stone is maintained, which to turn brilliant temperature,
Turn brilliant time 8-12h；
Step（2）Hot air temperature used in middle predrying is at 100-200 DEG C；
Step（3）It is middle through pre-dried material dewatering temperature be 150-300 DEG C.
Theoretical foundation：Dihydrate gypsum is by Ca2+、SO4 2-The stratiform structure that the ions binding layer of composition is formed with water molecule layer
It makes, interlamellar spacing about 3A or so, when heated, the main thoroughfare of hydrone migration is water molecule layer to dihydrate gypsum, because of water molecule layer
Relatively thin, therefore the hydrone of dihydrate gypsum is larger to the required resistance that overcomes during external migration, only these hydrones have enough
During energy, hydrone could be deviate to become semi-hydrated gypsum out of dihydrate gypsum.
Under normal conditions, alpha-semi water plaster stone be saturated vapor or using water as medium in the case of heat and take off in liquid form
Formed after removing 1.5 hydrones, and heated in the case where being communicated with air slough in a gaseous form 1.5 hydrones then β-
Semi-hydrated gypsum.Generation α, β semi-hydrated gypsum principle is dehydrated according to dihydrate gypsum, the present invention is using atmospheric steam as heat medium, low
In sub-saturated steam under boiling temperature, ardealite is made to be in vapour-liquid, thermal dehydration in two-phase coexists, to meet generation α-half
The primary condition of water gypsum；With the crystal seed of addition（Alpha-semi water plaster stone）For Nucleating Agent, other sulfate, fluorination in ardealite are utilized
Object and unformed silicon etc. can reduce by two gypsum dehydration activation energy, in conjunction with semi-hydrated gypsum to Al3+The characteristics of selective absorption, uses aluminium
Strong acid salt make crystal modifier, dihydrate gypsum is promoted to be converted to alpha-semi water plaster stone.Ardealite containing alpha-semi water plaster stone is being turned into crystalline substance
In case, to prevent its water suction from changing into dihydrate gypsum, dehydration is then transferred to water content ＜ 5% is adhered to hot-air predrying
Device further allows remaining dihydrate gypsum to be dehydrated into β-semi-hydrated gypsum to get the compound semi-hydrated gypsum of alpha-beta.
Beneficial effects of the present invention：
1st, the present invention does not have to high-tension apparatus, is not required to aqueous medium, compared with conventional method, has that production equipment is simple, technique item
The characteristics of part is mildly and low energy consumption；
2nd, the semi-hydrated gypsum of this method production is compared with common β-semi-hydrated gypsum, and consumptive use of water normal consistence is few, using traditional handicraft
The plastering intensity of preparation is high, and compared with alpha-semi water plaster stone, production cost is low；
3rd, due to this method prepare the compound semi-hydrated gypsum physicochemical property of alpha-beta it is good, can be producing building powdered gypsum by using phosphogypsum or
Gypsum block provides a kind of practicable technology, is conducive to improve the resource utilization rate of ardealite, fundamentally solves
Certainly perplex high concentration phosphate fertilizer Sustainable Development of Enterprises bottleneck problem for a long time.
Description of the drawings
Fig. 1 is present invention process flow chart.
Specific embodiment
In following embodiments, the volume that is blended in of ardealite and crystal modifier, crystal seed is completed for 150L horizontal mixers；In advance
Prepared by heat, alpha-semi water plaster stone, pre-drying process turns to carry out in brilliant case in alpha-semi water plaster stone, and alpha-semi water plaster stone turns brilliant case overall dimensions
It arranges in dg50 seamless pipes 6 and completes for 800 × 500 × 450mm, bottom, 60 ° of angle difference at left and right sides of every seamless pipe
Open each 6 of the aperture of Φ 3mm, the dislocation of two side opening is uniformly distributed, and 3 for leading to steam, in addition 3 for leading to hot-air, steam and
Hot-air is respectively by electrically heated boiler and electrical heating wind turbine（Blower press is 12kPa）It provides；The preparation of the compound semi-hydrated gypsum of alpha-beta
It is carried out in FN101-3 air dry ovens.
The compound semi-hydrated gypsum physicochemical property of the alpha-beta of preparation examine as defined in GB/T9776-2008 building gypsums condition into
Row.
Embodiment 1
Ardealite is derived from ardealite storage yard, and through analysis, attachment water content is 10%, pH value 5.0, in terms of butt, takes this phosphorus stone
Cream 200kg weighs crystal modifier aluminum nitrate 400g by ardealite butt quality 0.2%, crystal seed 4000g is weighed based on 2% mass, is divided to two
It is secondary to be uniformly mixed in horizontal mixer, it is transferred to alpha-semi water plaster stone and turns in brilliant case.
（1）It is prepared by the compound semi-hydrated gypsum of alpha-beta
The sub-saturated air that with steam humidifying to humidity be 90%, temperature is 80 DEG C carries out heat temperature raising, and temperature is indicated when turning brilliant case
During 60 DEG C of ＞, use atmospheric steam instead and heated, and maintain to turn a brilliant the temperature inside the box be 100 DEG C, humidity 95%, after 8h is kept the temperature,
Predrying dehydration is carried out with 100 DEG C of hot-air again, when material adheres to water content ＜ 5%, is transferred in drying box at 300 DEG C
Further dehydration is the compound semi-hydrated gypsum of alpha-beta.
（2）The compound semi-hydrated gypsum performance detection of alpha-beta
Through analysis, the compound semi-hydrated gypsum normal consistency water requirement of alpha-beta manufactured in the present embodiment be 62%, presetting period 12min,
Final setting time is 27min；40 × 40 × 160mm test specimens are made in the compound semi-hydrated gypsum of alpha-beta, 2h flexural strengths are 3.5MPa, are resisted
Compressive Strength is 7.2MPa.
Embodiment 2
Ardealite is derived from phosphoric acid production scene, and through analysis, attachment water content is 25%, pH value 3.5, in terms of butt, takes this phosphorus
Gypsum 200kg weighs crystal modifier aluminum sulfate 1000g by ardealite butt quality 0.5%, crystal seed 2000g is weighed based on 1% mass,
It is uniformly mixed at twice in horizontal mixer, is transferred to alpha-semi water plaster stone and turns in brilliant case.
（1）It is prepared by the compound semi-hydrated gypsum of alpha-beta
The sub-saturated air that with steam humidifying to humidity be 80%, temperature is 100 DEG C carries out heat temperature raising, and when turning, brilliant case instruction is warm
When spending 60 DEG C of ＞, use atmospheric steam instead and heated, and maintain to turn a brilliant the temperature inside the box be 85 DEG C, humidity 85%, kept the temperature through 12h
Afterwards, then with 200 DEG C of hot-air predrying dehydration is carried out, when material adheres to water content ＜ 5%, be transferred in drying box at 150 DEG C
Lower further dehydration, is the compound semi-hydrated gypsum of alpha-beta.
（2）The compound semi-hydrated gypsum performance detection of alpha-beta
Through analysis, the compound semi-hydrated gypsum normal consistency water requirement of alpha-beta manufactured in the present embodiment be 54%, presetting period 8min, eventually
The solidifying time is 17min；The compound semi-hydrated gypsum of alpha-beta is made 40 × 40 × 160mm test specimens, 2h flexural strengths are 7.2MPa, resistance to compression
Intensity is 21.3MPa.
Embodiment 3
Ardealite is derived from phosphoric acid production scene, and through analysis, attachment water content is 22%, pH value 2.5, in terms of butt, takes this phosphorus
Gypsum 200kg weighs crystal modifier aluminium chloride 600g by ardealite butt quality 0.3%, crystal seed 3000g is weighed based on 1.5% mass,
It is uniformly mixed at twice in horizontal mixer, is transferred to alpha-semi water plaster stone and turns in brilliant case.
（1）It is prepared by the compound semi-hydrated gypsum of alpha-beta
With steam humidifying to humidity be 85%, sub-saturated air at a temperature of 90 °C carries out heat temperature raising, and temperature is indicated when turning brilliant case
During 60 DEG C of ＞, use atmospheric steam instead and heated, and maintain to turn a brilliant the temperature inside the box be 90 DEG C, humidity 90%, after 10h is kept the temperature,
Predrying dehydration is carried out with 150 DEG C of hot-air again, when material adheres to water content ＜ 5%, is transferred in drying box at 200 DEG C
Further dehydration is the compound semi-hydrated gypsum of alpha-beta.
（2）The compound semi-hydrated gypsum performance detection of alpha-beta
Through analysis, the compound semi-hydrated gypsum normal consistency water requirement of alpha-beta manufactured in the present embodiment be 62%, presetting period 11min,
Final setting time is 23min；40 × 40 × 160mm test specimens are made in the compound semi-hydrated gypsum of alpha-beta, 2h flexural strengths are 5.1MPa, are resisted
Compressive Strength is 16.5MPa.
Claims (8)
1. a kind of method that the compound semi-hydrated gypsum of alpha-beta is prepared with ardealite, is as follows：
（1）Alpha-semi water plaster stone is put into after ardealite and crystal modifier, crystal seed are sufficiently mixed to turn in brilliant case, is carried out with sub-saturated air
Preheating when turning brilliant 60 DEG C of box temperature degree ＞, is passed through atmospheric steam and maintains temperature and humidity, realizes that part dihydrate gypsum turns in ardealite
Turn to alpha-semi water plaster stone；
（2）It after completing the brilliant operation of alpha-semi water plaster stone turn, is passed through hot-air and carries out predrying, make material attachment water content ＜ 5%；
（3）It is further dehydrated through pre-dried material, the dihydrate gypsum not being dehydrated is made to be converted into β-semi-hydrated gypsum and is answered to get alpha-beta
Close semi-hydrated gypsum.
2. according to the method described in claim 1, ardealite adhesive water content is in 10-25%, pH value 2.5-5.0.
3. according to the method described in claim 1, it is characterized in that, the crystal modifier is sulfate, hydrochloride or the nitric acid of aluminium
Salt；The crystal seed is commercially available high-strength αsemiwatergypsum；Crystal modifier and seed size were 180 mesh square hole screen screen over-size ＜ 5%
Powder；Crystal modifier additive amount is the 0.2-0.5wt% of ardealite butt, and seed load is the 1-2wt% of ardealite butt.
4. according to the method described in claim 1, it is characterized in that, the alpha-semi water plaster stone turns brilliant case as square or circular knot
Structure, the narrow meshed air hose of sole arrangement and distribution of steam pipe are several, top installation temperature monitor, thermometer and blow vent.
5. according to the method described in claim 1, it is characterized in that, step（1）Sub-saturated air themperature used during middle preheating
For 80-100 DEG C, humidity 80-90%.
6. according to the method described in claim 1, it is characterized in that, step（1）In be passed through atmospheric steam maintain temperature be 85-
100 DEG C, humidity 85-95%, turn brilliant time 8-12h.
7. according to the method described in claim 1, it is characterized in that, step（2）Hot air temperature used in middle predrying is
100-200℃。
8. according to the method described in claim 1, it is characterized in that, step（3）Middle dehydration temperaturre is 150-300 DEG C.
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| CN108863126A (en) * | 2018-08-29 | 2018-11-23 | 宁波金泽新型建材有限公司 | A method of alpha-semi water plaster stone is prepared using desulfurized gesso of flue gas |
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| CN113480209A (en) * | 2021-07-16 | 2021-10-08 | 昆明理工大学 | Method for preparing high-strength building gypsum by dry method |
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| CN114031321A (en) * | 2021-09-09 | 2022-02-11 | 湖北三峡职业技术学院 | Process and device for preparing alpha-beta composite semi-hydrated gypsum by using phosphogypsum |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108863126A (en) * | 2018-08-29 | 2018-11-23 | 宁波金泽新型建材有限公司 | A method of alpha-semi water plaster stone is prepared using desulfurized gesso of flue gas |
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| CN113480209A (en) * | 2021-07-16 | 2021-10-08 | 昆明理工大学 | Method for preparing high-strength building gypsum by dry method |
| CN114031321A (en) * | 2021-09-09 | 2022-02-11 | 湖北三峡职业技术学院 | Process and device for preparing alpha-beta composite semi-hydrated gypsum by using phosphogypsum |
| CN113880471A (en) * | 2021-11-12 | 2022-01-04 | 天宝动物营养科技股份有限公司 | Preparation method of alpha-beta composite semi-hydrated gypsum |
| CN114538811A (en) * | 2021-11-12 | 2022-05-27 | 天宝动物营养科技股份有限公司 | Method for preparing high-strength gypsum from phosphogypsum |
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