CN103466678A - Preparation method of special-shaped calcium carbonate - Google Patents
Preparation method of special-shaped calcium carbonate Download PDFInfo
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- CN103466678A CN103466678A CN2013104464994A CN201310446499A CN103466678A CN 103466678 A CN103466678 A CN 103466678A CN 2013104464994 A CN2013104464994 A CN 2013104464994A CN 201310446499 A CN201310446499 A CN 201310446499A CN 103466678 A CN103466678 A CN 103466678A
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- calcium carbonate
- shaped calcium
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- screw extruder
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- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title claims abstract description 186
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 93
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 239000013078 crystal Substances 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 239000000725 suspension Substances 0.000 claims abstract description 18
- 238000003763 carbonization Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 17
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 15
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 15
- 239000002245 particle Substances 0.000 claims abstract description 9
- 238000001125 extrusion Methods 0.000 claims abstract description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 20
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 19
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 13
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 11
- 238000007906 compression Methods 0.000 claims description 11
- 235000011089 carbon dioxide Nutrition 0.000 claims description 9
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 8
- 238000010008 shearing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 7
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 6
- 238000005189 flocculation Methods 0.000 claims description 6
- 230000016615 flocculation Effects 0.000 claims description 6
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 238000005728 strengthening Methods 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 4
- 229940037003 alum Drugs 0.000 claims description 4
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000391 magnesium silicate Substances 0.000 claims description 4
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 4
- 235000019792 magnesium silicate Nutrition 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 238000005255 carburizing Methods 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 229940075507 glyceryl monostearate Drugs 0.000 claims description 3
- 239000001788 mono and diglycerides of fatty acids Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 claims description 3
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 3
- 229920000053 polysorbate 80 Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 229920001213 Polysorbate 20 Polymers 0.000 claims description 2
- 239000011438 cord wood Substances 0.000 claims description 2
- 238000013461 design Methods 0.000 claims description 2
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims description 2
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract description 3
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 2
- 239000000411 inducer Substances 0.000 abstract 2
- 235000011837 pasties Nutrition 0.000 abstract 2
- 230000003311 flocculating effect Effects 0.000 abstract 1
- 230000006698 induction Effects 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 description 14
- 238000000576 coating method Methods 0.000 description 14
- 239000000843 powder Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003973 paint Substances 0.000 description 4
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 3
- 229910021532 Calcite Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000003831 antifriction material Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000004579 marble Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Paper (AREA)
Abstract
The invention discloses a preparation method of special-shaped calcium carbonate. Through a high shear rate, high pressure and high-temperature reaction of a screw extruder, carbonization is fast completed so that the special-shaped calcium carbonate having a sheet structure is produced continuously, fast and efficiently. The preparation method comprises the following steps of dispersing a crystal form inducer in a calcium hydrate suspension liquid having a high concentration of 20-40%, flocculating the calcium hydrate suspension liquid by a flocculant to obtain pasty slurry, carrying out forced directed extrusion transportation on the pasty slurry to screws by a homodromous twin-screw extruder under the conditions of a rotation rate of 500-800rpm and a screw temperature of 80-120 DEG C so that by crystal form inducer induction, under the action of a high shear rate, high pressure and a high-temperature, the special-shaped calcium carbonate having a sheet structure is fast produced by carbonization, and carrying out two-stage vacuum devolatilization drying and eddy machine-based crushing on the material at a material outlet to obtain the special-shaped calcium carbonate having a sheet structure, radial particle sizes of 1.5-3 microns, sheet thickness of 0.01-0.02 microns and a radius-thickness ratio greater than or equal to 75: 1. The preparation method finishes feeding, a shear reaction and devolatilization drying in one step, realizes continuous operation, can be implemented and controlled easily, has a low cost and is conducive to industrial production.
Description
Technical field
The present invention relates to other shaped calcium carbonate field, be specifically related to a kind of preparation method with other shaped calcium carbonate of chip architecture.
Background technology
Calcium carbonate is a kind of natural resource, and it mainly comes from calcite, Wingdale and marble, and molecular formula is CaCO
3.Traditional mode of utilizing is to adopt Mechanical Crushing to grind to form calcium carbonate superfine powder after exploitation again, is mainly used in the common fillers of coating, plastics, rubber, papermaking, food, medicine and other fields.Development along with the inorganic non-metallic technology, calcium carbonate develops rapidly towards diversification, specialization, the direction that becomes more meticulous, because cuboidal calcium carbonate surface can be lower, the most stable at nature, so in normal circumstances, no matter be directly grind or react by carborization, obtaining crystal structure of calcium carbonate is generally cuboidal structure, its application is subject to certain restrictions, and single super-refinement can't meet the application needs of calcium carbonate.At present, calcium carbonate is just towards abnormally-structured development, such as the calcium carbonate of sheet, spindle, needle-like, the crystal formation such as spherical, because its special structure makes it, in application, gives material special functional.
Flaky calcium carbonate is a kind of functional calcium carbonate with level and smooth sheet structure, its slickness is high, glossiness is high, shading power is strong, have high using value in industries such as lubricated, papermaking, coating, paint, therefore, flaky calcium carbonate had obtained developing fast and applying in recent years.Due to its good sheet structure and sliding, can be used as antifriction material for all kinds of lubricating grease; In papermaking, flaky calcium carbonate is conducive to retain in page and improve paper opaqueness, smoothness and printability, prevents printing-ink infiltration page; In Paper Coating, flaky calcium carbonate orderly arrangement in coating, coating structure is closely knit, thereby can improve print gloss, reduce the coating Gas permeability, gives fiber-covered rate that paper coating is good and higher smoothness; In paint, the alternative Rutile type Titanium Dioxide of flaky calcium carbonate is given whiteness, the gloss and opacifying property that coating is good, well being applied of the senior paint of automobile.
The flaky calcium carbonate technology has two kinds of routes usually at present: a kind of is that calcium carbonate is fired, digested for Ca (OH)
2suspension liquid passes into CO in carbonating tower
2gas carries out carbonization, by chemical additives, can control the calcium carbonate crystal formation, obtains flaky calcium carbonate.As the patent of notification number CN100400422C discloses a kind of preparation technology of tabular light calcium carbonate, the method will digest Ca (OH)
2slurries are put into jacket reactor, and stirring is also cooling, makes the temperature of slurries be reduced to the 10-40 degree, open the carbonic acid gas carbonization, add chemical additives, after carbonization finishes, cross carbonization 10 minutes, then continue to stir 1-3h, finally wash, dewater, dry, sieving obtains flake light calcium carbonate.Although be controlled in carbonating tower and can obtain flaky calcium carbonate by crystal formation, but because the reaction times surpasses more than 1 hour, energy consumption is high, cost is high, has limited the application of flaky calcium carbonate, and flaky calcium carbonate chemical additives inducibility is limited especially at present, the flaky calcium carbonate radius-thickness ratio obtained is lower, be generally 5:1-10:1, therefore, the using value limitation is very large.Another kind is that calcium carbonate is directly ground and obtains, as the patent of notification number CN101514533B discloses a kind of flaky calcium carbonate and its preparation method and application, the method is added to the water fibrous light cakium carbonate, and Xiang Shuizhong adds composite grinding aids to be ground slurry, make the flaky calcium carbonate slurry.The patent of publication number CN101514028 discloses the method for flaky ground calcium carbonate powder, and the method be take calcite ore as raw material, by horizontal ball mill, is ground, and obtains flaky ground calcium carbonate powder.Prepare flaky calcium carbonate more than half an hour consuming time by polishing, belong to batch production, not only efficiency is low, energy consumption is high, and, owing to there being powerful the grinding, the radius-thickness ratio loss is serious, and general footpath is thick only has 5:1.
According to above-mentioned, the flaky calcium carbonate that technical qualification obtain at present is due to the restriction that is subject to crystal formation inductor and reaction conditions, not only length consuming time, energy consumption is high, cost is high, and the radius-thickness ratio of flaky calcium carbonate is lower, fail to give full play to the characteristic of flaky calcium carbonate smoothness, high gloss, high covering power.
Summary of the invention
Prepare for prior art the defect that the flaky calcium carbonate time is long, energy consumption is high, crystal formation inductor inducibility is limited, the invention provides a kind of preparation method of other shaped calcium carbonate, specifically a kind of preparation method with chip architecture other shaped calcium carbonate.
For achieving the above object, the present invention proposes a kind of preparation method of other shaped calcium carbonate, it is characterized in that high-shear, high pressure, the pyroreaction by screw extruder completes carbonization fast, thereby rapidly and efficiently generates continuously the other shaped calcium carbonate of chip architecture.
The preparation method of a kind of other shaped calcium carbonate that the present invention proposes comprises following concrete steps:
(1) calcium hydroxide and water are mixed with by weight to the suspension of 20-40% in high-speed mixer, add the crystal formation inductor in suspension, and constantly stir 1-3 minute with the speed of 100-200rpm, the crystal formation inductor is dispersed in suspension fully, the 1-3% that crystal formation inductor add-on is calcium hydroxide weight;
(2) flocculation agent, release of carbonate dioxide agent, pore forming material are added in step (1), and constantly stir 5-10 minute with the speed of 50-80rpm, finally flocculate to the paste slurry, the 2-5% that flocculant addition is calcium hydroxide weight, release of carbonate dioxide agent add-on is 3% of calcium hydroxide weight, the 0.2-0.5% that the pore forming material add-on is calcium hydroxide weight;
(3) the paste slurry obtained in step (2) is pumped into to screw extruder, screw extruder is by carrying screwing element, the thread engagement element, the compression screwing element is arranged on mandrel with cord wood, form transportation section, shear the section section, compression section three parts, control extruder temperature 80-120 ℃, produce and shear under the high speed rotating condition of 500-800rpm, screw extruder delivers into screw rod by the enforceable directed extruding of slurry, slurry is axially being sheared and is being cut into slices, and produce the high pressure of 15-20MPa in compression section, the continuous carbon dioxide gas of release of carbonate dioxide agent, by the strong shearing of screw extruder and high pressure, strengthening carbonic acid gas osmosis, by the crystal formation inductor, induce, in high-shear, complete fast the other shaped calcium carbonate that carbonization forms chip architecture under the effect of high pressure and high temperature, the last other shaped calcium carbonate of dry chip architecture that obtains by vacuum volatilization at discharge port,
(4) the other shaped calcium carbonate obtained in step (3) is dropped into to the eddy airstream pulverizer, obtain radially particle diameter 1.5-3 μ m, the thick 0.01-0.02 μ of sheet m, the chip architecture other shaped calcium carbonate of radius-thickness ratio >=75:1.
Screw extruder described in above-mentioned preparation method is that parallel dual-screw is forced extrusion machine, and screw diameter is 120-180mm.
Screw extruder described in above-mentioned preparation method, wherein said thread engagement element oblique angle is 60 ° and 90 °, during bolt rotary, the paste slurry produces the exchange of axial material and moves back and forth, carbonic acid gas generation carburizing reagent with continuous release, slurry constantly is sheared, is orientated, cuts, folds, reorientation, thereby flash carbonization obtains shearing section.
Screw extruder described in above-mentioned preparation method has stable transport efficiency and the residence time of material of stable and uniform, and slurry stops 10-15min in screw extruder.The temperature that screw extruder transportation section described in above-mentioned preparation method, shearing section section, compression section are set is followed successively by 80 ℃, 120 ℃, 100 ℃, 120 ℃ of discharge port design temperatures, at material outlet, the secondary vacuum volatilization device is set, be less than-1.5Mpa of vacuum volatilization pressure, guarantee flaky calcium carbonate water content≤0.5%.
Crystal formation inductor described in above-mentioned preparation method is a kind of in stratiform calcium sulfate, lamina sodium silicate, layered magnesium silicate.
Flocculation agent described in above-mentioned preparation method is a kind of in polyaluminium sulfate, polyacrylamide, alum.
Release of carbonate dioxide agent described in above-mentioned preparation method is sodium bicarbonate.
Pore forming material described in above-mentioned preparation method is a kind of in polyvinyl alcohol, polyoxyethylene sorbitan monooleate, glyceryl monostearate, Tween-20, this pore forming material is a kind of interfacial agent, can in flocculation paste slurry, form micro bubble, for the carbonic acid gas of follow-up release provides space, increase the carburizing reagent interface.
The preparation method of a kind of other shaped calcium carbonate of the present invention, its outstanding characteristics are:
1, the present invention has realized that by high-shear section, high pressure, the high temperature of screw extruder the continuous high-efficient carbonization prepares other shaped calcium carbonate, has obtained the other shaped calcium carbonate of high radius-thickness ratio chip architecture, has solved the limited defect of current crystal formation inductor inducibility;
2, the present invention has realized that by flocculation agent, built-in release of carbonate dioxide agent flash carbonization prepares other shaped calcium carbonate under High Concentration Situation;
3, the present invention is disposable in screw extruder completes conveying, cleavage reaction, devolatilization drying, but continuous operation, easy to implement and control, with low cost, be beneficial to suitability for industrialized production;
The other shaped calcium carbonate of the chip architecture that 4, the present invention obtains has excellent radius-thickness ratio, glossiness, smoothness, whiteness, shading performance, can be widely used in the fields such as lubricated, papermaking, coating, paint;
5, the chip architecture other shaped calcium carbonate that the preparation method of a kind of other shaped calcium carbonate of the present invention makes has excellent performance, and the key technical indexes is as following table 1:
| Project | Test condition | Other shaped calcium carbonate of the present invention |
| Size distribution | Laser particle size analyzer | Particle diameter 1.5-3 μ m is greater than 97% |
| Median size | Laser particle size analyzer | 2.3μm |
| The average diameter thickness rate | ? | ≥150：1 |
| Whiteness | The 457nm place | ≥96% |
Table 1
The chip architecture other shaped calcium carbonate that the preparation method of a kind of other shaped calcium carbonate of the present invention makes has excellent performance, and the paper coating the key technical indexes prepared with it is as following table 2:
| Project | Test condition | The coating of other shaped calcium carbonate of the present invention |
| Smoothness | GB/T456 | ≥800s |
| Glossiness | GB/T8941 | ≥75% |
| Opaqueness | GB/T1541 | ≥97% |
| Whiteness | GB/T7949 | ≥91% |
Table 2.
The accompanying drawing explanation
Fig. 1 is the process flow diagram that the preparation method of a kind of other shaped calcium carbonate of the present invention adopts.
Embodiment
Following embodiment, be described in further detail foregoing of the present invention again.But this should be interpreted as to the scope of the above-mentioned theme of the present invention only limits to following example.Without departing from the idea case in the present invention described above, various replacements or the change according to ordinary skill knowledge and customary means, made, all should comprise within the scope of the invention.
embodiment 1
(1) in the SL300 high-speed mixer, 40kg calcium hydroxide and 60kg water are mixed with to 40% suspension, in suspension, add the 0.8kg lamina sodium silicate, and constantly stir 3 minutes with the speed of 200rpm, make lamina sodium silicate be dispersed in suspension fully;
(2) 0.8k polyacrylamide, 1.2kg sodium bicarbonate, 0.08kg polyvinyl alcohol 2488 are added in step (1), and constantly stir 10 minutes with the speed of 50rpm, finally flocculate to paste;
(3) the paste slurry obtained in step (2) is pumped into to screw extruder, control extruder temperature 80-120 ℃, produce and shear under the high speed rotating condition of 800rpm, screw extruder delivers into screw rod by the enforceable directed extruding of slurry, slurry is axially being sheared and is being cut into slices, and produce the high pressure of 20MPa in compression section, the continuous carbon dioxide gas of release of carbonate dioxide agent, by the strong shearing of screw extruder and high pressure, strengthening carbonic acid gas osmosis, by the crystal formation inductor, induce, in high-shear, complete fast the other shaped calcium carbonate that carbonization forms chip architecture under the effect of high pressure and high temperature, finally at discharge port, by vacuum volatilization, obtain dry chip architecture other shaped calcium carbonate,
(4) the chip architecture other shaped calcium carbonate obtained in step (3) is dropped into to the eddy airstream pulverizer, obtain chip architecture other shaped calcium carbonate fine powder.
By detecting: the other shaped calcium carbonate obtained is the white powder crystal, and crystal is oval sheet more than 97%, average radial particle diameter 2.3 μ m, the thick 0.01-0.02 μ of sheet m, average diameter thickness rate 150:1, BET specific surface area 7.5m2/g, whiteness 96%.
70 parts of other shaped calcium carbonate of the present invention and 30 parts of china clay are prepared into to the Paper Coating material to be detected: during glue spread 20g/m2, and glossiness 75.6%, smoothness 822s, opaqueness 97%.
embodiment 2
(1) in the SL300 high-speed mixer, 30kg calcium hydroxide and 70kg water are mixed with to 30% suspension, in suspension, add the 0.6kg layered magnesium silicate, and constantly stir 3 minutes with the speed of 200rpm, make layered magnesium silicate be dispersed in suspension fully;
(2) 1.2kg alum, 0.9kg sodium bicarbonate, 0.12kg glyceryl monostearate are added in step (1), and constantly stir 5 minutes with the speed of 50rpm, finally flocculate to paste;
(3) the paste slurry obtained in step (2) is pumped into to screw extruder, control extruder temperature 80-120 ℃, produce and shear under the high speed rotating condition of 800rpm, screw extruder delivers into screw rod by the enforceable directed extruding of slurry, slurry is axially being sheared and is being cut into slices, and produce the high pressure of 20MPa in compression section, the continuous carbon dioxide gas of release of carbonate dioxide agent, by the strong shearing of screw extruder and high pressure, strengthening carbonic acid gas osmosis, by the crystal formation inductor, induce, in high-shear, complete fast the other shaped calcium carbonate that carbonization forms chip architecture under the effect of high pressure and high temperature, finally at discharge port, by vacuum volatilization, obtain dry chip architecture other shaped calcium carbonate,
(4) the chip architecture other shaped calcium carbonate obtained in step (3) is dropped into to the eddy airstream pulverizer, obtain chip architecture other shaped calcium carbonate fine powder.
By detecting: the other shaped calcium carbonate obtained is the white powder crystal, and crystal is oval sheet more than 97%, average radial particle diameter 2.2 μ m, the thick 0.01-0.02 μ of sheet m, average diameter thickness rate 200:1, BET specific surface area 7.8m2/g, whiteness 97%.
70 parts of other shaped calcium carbonate of the present invention and 30 parts of china clay are prepared into to the Paper Coating material to be detected: during glue spread 16g/m2, and glossiness 75%, smoothness 1100s, opaqueness 97%.
embodiment 3
(1) in the SL300 high-speed mixer, 20kg calcium hydroxide and 80kg water are mixed with to 20% suspension, in suspension, add 0.2kg stratiform calcium sulfate, and constantly stir 2 minutes with the speed of 100rpm, make stratiform calcium sulfate be dispersed in suspension fully;
(2) 0.4kg polyaluminum sulfate al alum, 0.6kg sodium bicarbonate, 0.04kg polyoxyethylene sorbitan monooleate are added in step (1), and constantly stir 8 minutes with the speed of 80rpm, finally flocculate to paste;
(3) the paste slurry obtained in step (2) is pumped into to screw extruder, control extruder temperature 80-120 ℃, produce and shear under the high speed rotating condition of 800rpm, screw extruder delivers into screw rod by the enforceable directed extruding of slurry, slurry is axially being sheared and is being cut into slices, and produce the high pressure of 20MPa in compression section, the continuous carbon dioxide gas of release of carbonate dioxide agent, by the strong shearing of screw extruder and high pressure, strengthening carbonic acid gas osmosis, by the crystal formation inductor, induce, in high-shear, complete fast the other shaped calcium carbonate that carbonization forms chip architecture under the effect of high pressure and high temperature, finally at discharge port, by vacuum volatilization, obtain dry chip architecture other shaped calcium carbonate,
(4) the chip architecture other shaped calcium carbonate obtained in step (3) is dropped into to the eddy airstream pulverizer, obtain chip architecture other shaped calcium carbonate fine powder.
By detecting: the other shaped calcium carbonate obtained is the white powder crystal, and crystal is oval sheet more than 98%, average radial particle diameter 2.5 μ m, the thick 0.01-0.02 μ of sheet m, average diameter thickness rate 180:1, BET specific surface area 7.3m2/g, whiteness 96%.
70 parts of other shaped calcium carbonate of the present invention and 30 parts of china clay are prepared into to the Paper Coating material to be detected: during glue spread 25g/m2, and glossiness 77%, smoothness 960s, opaqueness 98%.
Claims (5)
1. the preparation method of an other shaped calcium carbonate, is characterized in that utilizing high-shear, high pressure, the pyroreaction of screw extruder, under crystal formation inductor inducing action, completes fast the other shaped calcium carbonate that carbonization forms chip architecture, and concrete preparation process is as follows:
(1) calcium hydroxide and water are mixed with by weight to the suspension of 20-40% in high-speed mixer, add the crystal formation inductor in suspension, and constantly stir 1-3 minute with the speed of 100-200rpm, the crystal formation inductor is dispersed in suspension fully, the 1-3% that crystal formation inductor add-on is calcium hydroxide weight;
(2) flocculation agent, release of carbonate dioxide agent, pore forming material are added in step (1), and constantly stir 5-10 minute with the speed of 50-80rpm, finally flocculate to the paste slurry, the 2-5% that flocculant addition is calcium hydroxide weight, release of carbonate dioxide agent add-on is 3% of calcium hydroxide weight, the 0.2-0.5% that the pore forming material add-on is calcium hydroxide weight;
(3) the paste slurry obtained in step (2) is pumped into to screw extruder, screw extruder is by carrying screwing element, the thread engagement element, the compression screwing element is arranged on mandrel with cord wood, form transportation section, shear the section section, compression section three parts, control extruder temperature 80-120 ℃, produce and shear under the high speed rotating condition of 500-800rpm, screw extruder delivers into screw rod by the enforceable directed extruding of paste slurry, slurry is axially being sheared and is being cut into slices, and produce the high pressure of 15-20MPa in compression section, the continuous carbon dioxide gas of release of carbonate dioxide agent, by the strong shearing of screw extruder and high pressure, strengthening carbonic acid gas osmosis, by the crystal formation inductor, induce, in high-shear, complete fast the other shaped calcium carbonate that carbonization forms chip architecture under the effect of high pressure and high temperature, finally at discharge port, by vacuum volatilization, obtain dry chip architecture other shaped calcium carbonate,
(4) the other shaped calcium carbonate obtained in step (3) is dropped into to the eddy airstream pulverizer, obtain radially particle diameter 1.5-3 μ m, the thick 0.01-0.02 μ of sheet m, the chip architecture other shaped calcium carbonate of radius-thickness ratio >=75:1.
2. the preparation method of a kind of other shaped calcium carbonate as claimed in claim 1, is characterized in that the described screw extruder of step (3) is that parallel dual-screw is forced extrusion machine, and screw diameter is 120-180mm.
3. the preparation method of a kind of other shaped calcium carbonate as claimed in claim 1, it is characterized in that the described thread engagement element of step (3) oblique angle is 60 ° and 90 °, during bolt rotary, the paste slurry produces the exchange of axial material and moves back and forth, carbonic acid gas generation carburizing reagent with continuous release, slurry constantly is sheared, is orientated, cuts, folds, reorientation, thereby flash carbonization obtains shearing section.
4. the preparation method of a kind of other shaped calcium carbonate as claimed in claim 1, the temperature of it is characterized in that the described screw extruder of step (3) transportation section, shear the section section, compression section being set is followed successively by 80 ℃, 120 ℃, 100 ℃, 120 ℃ of discharge port design temperatures, and the secondary vacuum volatilization device is set, be less than-1.5Mpa of vacuum volatilization pressure, guarantee other shaped calcium carbonate water content≤0.5%.
5. the preparation method of a kind of other shaped calcium carbonate as claimed in claim 1, is characterized in that described crystal formation inductor is a kind of in stratiform calcium sulfate, lamina sodium silicate, layered magnesium silicate; Described flocculation agent is a kind of in polyaluminium sulfate, polyacrylamide, alum; Described release of carbonate dioxide agent is sodium bicarbonate; Described pore forming material is a kind of in polyvinyl alcohol, polyoxyethylene sorbitan monooleate, glyceryl monostearate, Tween-20.
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| CN107881840A (en) * | 2017-11-02 | 2018-04-06 | 洪飞飞 | A kind of preparation method of the antibacterial foam wallpaper with lasting health-care efficacy |
| CN112142087A (en) * | 2020-09-29 | 2020-12-29 | 王权广 | Process for preparing regular spherical calcium carbonate by calcium chloride and ammonia water solution carbonization method |
| US11377363B2 (en) | 2020-06-30 | 2022-07-05 | Arelac, Inc. | Methods and systems for forming vaterite from calcined limestone using electric kiln |
| US11577965B2 (en) | 2020-02-25 | 2023-02-14 | Arelac, Inc. | Methods and systems for treatment of lime to form vaterite |
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| US9902652B2 (en) | 2014-04-23 | 2018-02-27 | Calera Corporation | Methods and systems for utilizing carbide lime or slag |
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Effective date of registration: 20180427 Address after: 318000 1055 Gaoxin Road, Taizhou Economic Development Zone, Zhejiang Patentee after: ZHEJIANG LINXIANG PLASTIC CO., LTD. Address before: 610091 Donghai Road, Jiao long industrial port, Qingyang District, Chengdu, Sichuan 4 Patentee before: Chengdu Xinkeli Chemical Sci-Tech Co., Ltd. |