CN113019664A - Ultralow-moisture nano calcium carbonate drying and depolymerization system and application method thereof - Google Patents
Ultralow-moisture nano calcium carbonate drying and depolymerization system and application method thereof Download PDFInfo
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- CN113019664A CN113019664A CN202110439136.2A CN202110439136A CN113019664A CN 113019664 A CN113019664 A CN 113019664A CN 202110439136 A CN202110439136 A CN 202110439136A CN 113019664 A CN113019664 A CN 113019664A
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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 98
- 238000001035 drying Methods 0.000 title claims abstract description 91
- 229910000019 calcium carbonate Inorganic materials 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000012065 filter cake Substances 0.000 claims abstract description 105
- 239000000843 powder Substances 0.000 claims abstract description 69
- 239000000463 material Substances 0.000 claims abstract description 51
- 239000000428 dust Substances 0.000 claims abstract description 31
- 239000006185 dispersion Substances 0.000 claims abstract description 22
- 238000001704 evaporation Methods 0.000 claims abstract description 20
- 230000008020 evaporation Effects 0.000 claims abstract description 20
- 239000000047 product Substances 0.000 claims abstract description 16
- 238000000926 separation method Methods 0.000 claims abstract description 11
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims 2
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
- B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
- F26B3/30—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun from infrared-emitting elements
Abstract
The invention relates to an ultralow-moisture nano calcium carbonate drying and depolymerization system and a using method thereof, wherein the system comprises a crushing module, a depolymerization and drying module, a grading module, a separation and dust removal module, a secondary drying module and a finished product collection module which are sequentially communicated; the crushing module comprises a filter cake crusher for primary crushing of materials and a filter cake dispersing mixer for secondary crushing of materials; the depolymerization drying module comprises a rotary flash evaporation dryer, and an outlet of the filter cake dispersion mixer is communicated with an inlet of the rotary flash evaporation dryer; the classifying module comprises a classifier, an outlet of the rotary flash evaporation dryer is communicated with an inlet of the classifier, and fine powder discharged from a fine powder outlet of the classifier is sent to the separating and dedusting module; the secondary drying module comprises an infrared microwave dryer. The system and the using method thereof can effectively dry and depolymerize calcium carbonate filter cakes, effectively control the moisture of calcium carbonate and simultaneously keep good dispersibility of powder.
Description
Technical Field
The invention relates to the field of calcium carbonate drying depolymerization, in particular to an ultralow-moisture nano calcium carbonate drying depolymerization system and a use method thereof.
Background
The nano calcium carbonate has fine particles, and in the drying process, because moisture volatilizes and powder shrinks, the particles agglomerate, the smaller the particles are, the larger the surface energy is, the aggregates are easy to generate, meanwhile, the nano calcium carbonate has more micropores and strong water absorption capacity, the environment with higher humidity is easy to get damp, the moisture is difficult to completely dry, and the moisture of the product exceeds the standard, so the drying depolymerization is an important step in the preparation process of the nano calcium carbonate.
At present, the nano calcium carbonate is usually dried by adopting methods of combining belt drying and disc drying, combining blade drying and flash drying, combining belt drying and disc drying and the like, the moisture is generally 0.3-0.5%, the method can only be suitable for common plastics, printing ink, glass cement, rubber and the like, and is not suitable for special sealants with strict moisture requirements, such as MS sealant (a crosslinked polymer based on silane end-capped polyether) and PU sealant (a crosslinked polymer of polyol and polyurethane) and the like.
Disclosure of Invention
Aiming at the defects, the invention aims to provide an ultralow-moisture nano calcium carbonate drying and depolymerization system and a using method thereof, which can solve the problems of easy agglomeration, difficult thorough drying of moisture, easy moisture absorption of powder and increase of moisture in the drying process of nano calcium carbonate in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a drying and depolymerization system for nanometer calcium carbonate with ultralow moisture content comprises a crushing module, a depolymerization and drying module, a grading module, a separation and dust removal module, a secondary drying module and a finished product collection module which are sequentially communicated;
the crushing module comprises a filter cake crusher and a filter cake dispersing mixer, the filter cake crusher is used for primary crushing of materials, the filter cake dispersing mixer is used for secondary crushing of the materials, a first conveying belt is arranged between an outlet of the filter cake crusher and an inlet of the filter cake dispersing mixer, and the first conveying belt is used for conveying the materials discharged from the filter cake crusher into the filter cake dispersing mixer;
the depolymerization drying module comprises a rotary flash evaporation dryer, an outlet of the filter cake dispersion mixer is communicated with an inlet of the rotary flash evaporation dryer, the rotary flash evaporation dryer comprises a rotary crushing device and is used for depolymerizing the materials, the bottom of the rotary flash evaporation dryer is communicated with hot air, and the hot air is used for drying the materials and blowing the materials to the outlet of the rotary flash evaporation dryer;
the classifying module comprises a classifier, an outlet of the rotary flash evaporation dryer is communicated with an inlet of the classifier, a coarse powder outlet of the classifier is communicated with an inlet of the filter cake crusher through a pipeline, and fine powder discharged from a fine powder outlet of the classifier is sent to the separating and dedusting module;
the secondary drying module comprises an infrared microwave dryer, and the infrared microwave dryer comprises a microwave generating device and a far infrared heating device.
Preferably, the system further comprises a filter press, and a second conveyor belt is arranged between the outlet of the filter press and the inlet of the filter cake crusher and used for feeding the material discharged from the filter press into the filter cake crusher.
Preferably, the dispersing and dedusting module comprises a cyclone separator and a bag-type dust collector, a fine powder outlet of the classifier is sequentially communicated with an inlet of the cyclone separator and an inlet of the bag-type dust collector, the bag-type dust collector is communicated with a draught fan, and fine powder discharged from the outlet of the cyclone separator and the outlet of the bag-type dust collector is sent to the secondary drying module.
Preferably, the system further comprises a semi-finished product collecting module, the semi-finished product collecting module comprises a semi-finished product collecting hopper and a star-shaped blanking machine, an outlet of the cyclone separator and an outlet of the bag-type dust collector are communicated with the semi-finished product collecting hopper, an outlet of the semi-finished product collecting hopper is communicated with an inlet of the star-shaped blanking machine, and an outlet of the star-shaped blanking machine is communicated with a feeding hopper of the infrared microwave dryer.
Preferably, the finished product collection module comprises a lifting machine, a storage bin and an automatic packaging machine which are sequentially communicated, and an outlet of the infrared microwave dryer is communicated with an inlet of the lifting machine.
Preferably, the filter cake crusher is a double-geared roller type filter cake crusher and comprises a material crushing cavity, a first crushing device and a second crushing device, wherein the first crushing device and the second crushing device are arranged oppositely;
the first crushing device comprises a first motor, a first speed reducer connected with the first motor and a first rotating roller shaft connected with an output shaft of the first speed reducer;
the second crushing device comprises a second motor, a second speed reducer connected with the second motor, and a second rotating roll shaft connected with an output shaft of the second speed reducer;
the first rotating roller shaft and the second rotating roller shaft are both provided with a plurality of tooth columns, gaps are arranged between the tooth columns of the first rotating roller shaft and the tooth columns of the second rotating roller shaft and used for crushing materials and falling after crushing, and the material crushing cavity is communicated with an inlet of the filter cake crusher.
Preferably, the filter cake dispersion mixes the machine and is the double helix dispersion and mixes machine, the filter cake dispersion mixes the machine and includes the U die cavity body and locates two internal parallel arrangement's of U die cavity (mixing) shaft, two the interval is provided with a plurality of helical blade on the (mixing) shaft, two the (mixing) shaft all is connected with the speed reducer, the speed reducer is connected with the motor.
Preferably, spin flash drying device's rotatory reducing mechanism includes crushing dish, sets up tup on the crushing dish, be fixed in the dwang of crushing dish bottom, the dwang relies on motor drive to rotate to drive the crushing dish and rotate.
Preferably, the microwave infrared dryer comprises a feed hopper, a box body, a microwave generating device and a far infrared heating device, wherein the microwave generating device and the far infrared heating device are arranged on the side wall of the box body;
the dehumidifier also comprises a dehumidifying device communicated with the box body and an exhaust fan communicated with the dehumidifying device;
the device also comprises a conveying belt which transversely penetrates through the box body and is used for discharging materials.
The use method of the ultra-low moisture nano calcium carbonate drying and depolymerization system comprises the following steps:
s1: feeding the calcium carbonate filter cake into a filter cake crusher to crush to obtain a small filter cake with the particle size of 1cm-5cm, and then feeding the small filter cake into a filter cake dispersing mixer to further crush to obtain coarse powder with the particle size of 0.1cm-3 cm;
s2: feeding the coarse powder into a cavity of a rotary flash evaporation dryer, setting the temperature in the cavity to be 150 ℃, depolymerizing the coarse powder by a rotary crushing device, and introducing hot air at 280 ℃ into the cavity to blow the depolymerized and dried dry powder into a classifier;
s3: feeding the coarse dry powder discharged from the classifier into a filter cake dispersing mixer for re-crushing, sequentially feeding the fine dry powder discharged from the classifier into a separation and dust removal module for dust removal, and then collecting;
s4: sending the collected fine dry powder into an infrared microwave dryer for secondary drying, firstly adjusting the temperature of the infrared microwave dryer to 60-90 ℃ for drying, then adjusting the temperature to 90-110 ℃ for drying, then adjusting the temperature to 60-90 ℃ for cooling, and using the infrared microwave dryer for secondary drying for 30-60 min to obtain low-moisture dry powder with the moisture content of less than or equal to 0.2%;
s5: and sealing the low-moisture dry powder in a film-coated bag with an inner container through a finished product collecting module.
After the technical scheme is adopted, the invention has the beneficial effects that:
the drying and depolymerization system for the ultralow-moisture nano calcium carbonate comprises a crushing module, a depolymerization and drying module, a grading module, a separation and dust removal module, a secondary drying module and a finished product collection module which are sequentially communicated; the calcium carbonate filter cake is ground twice through a filter cake grinder and a filter cake dispersion mixer of the grinding module to obtain calcium carbonate coarse powder, then the calcium carbonate coarse powder is further ground and depolymerized through a rotary flash evaporation dryer of the depolymerization drying module and is dried through hot air, fine powder separated out through the classifier is sent into the separation dust removal module, the coarse powder returns to the filter cake dispersion mixer to be further ground, the fine powder subjected to separation dust removal is sent into an infrared microwave dryer of the secondary drying module to be dried for the second time to obtain low-moisture calcium carbonate dry powder, and the low-moisture dry powder is sealed and collected through a finished product collection module. The system of the invention carries out three times of crushing and two times of drying processes on the calcium carbonate filter cake, effectively carries out drying depolymerization on the calcium carbonate filter cake, effectively controls the moisture of the calcium carbonate, and simultaneously keeps good dispersibility of the powder.
The use method of the drying and depolymerization system for the ultralow-moisture nano calcium carbonate can control the moisture content of calcium carbonate powder to be less than 0.2 percent and simultaneously can keep good dispersibility of the powder.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
in the figure: 1-a filter press, 11-a second conveying belt, 2-a filter cake crusher, 21-a material crushing cavity, 22-a first motor, 23-a first speed reducer, 24-a first rotating roller shaft, 25-a tooth column, 26-a first conveying belt, 3-a filter cake dispersing mixer, 31-a cavity of the filter cake dispersing mixer, 32-a stirring shaft, 33-a helical blade, 34-a third speed reducer, 35-a third motor, 4-a rotary flash dryer, 41-a cavity of the rotary flash dryer, 42-a crushing disc, 43-a hammer head, 44-a rotating rod, 45-a fourth motor, 46-a belt, 47-a hot air inlet, 48-an outlet, 5-a classifier, 6-a cyclone separator, 7-a bag dust remover, 71-an induced draft fan, 81-a semi-finished product collecting hopper, 82-a star-shaped blanking machine, 9-an infrared microwave dryer, 91-a feed hopper, 92-a box body, 93-a microwave generating device, 94-a far infrared heating device, 95-a microwave suppressor, 96-a dehumidifying device, 97-an exhaust fan, 98-a conveying belt, 101-a lifting machine, 102-a storage bin and 103-an automatic packaging machine.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
The first embodiment is as follows:
as shown in fig. 1, the drying and depolymerization system for ultra-low moisture nano calcium carbonate of the present embodiment includes a pulverization module, a depolymerization and drying module, a classification module, a separation and dust removal module, a semi-finished product collection module, a secondary drying module, and a finished product collection module, which are sequentially connected.
The crushing module comprises a filter cake crusher 2 and a filter cake dispersing mixer 3, wherein the filter cake crusher 2 is used for primary crushing of materials, the filter cake dispersing mixer 3 is used for secondary crushing of the materials, a first transmission belt 26 is arranged between an outlet of the filter cake crusher 2 and an inlet of the filter cake dispersing mixer 3, and the first transmission belt 26 is used for sending materials discharged from the filter cake crusher 2 into the filter cake dispersing mixer 3.
The filter cake crusher 2 is a double-geared roller type filter cake crusher and comprises a material crushing cavity 21, a first crushing device and a second crushing device, wherein the first crushing device and the second crushing device are arranged oppositely; the first crushing device comprises a first motor 22, a first speed reducer 23 connected with the first motor 22 and a first rotating roller shaft 24 connected with an output shaft of the first speed reducer 23; the second crushing device comprises a second motor, a second speed reducer connected with the second motor and a second rotating roll shaft connected with an output shaft of the second speed reducer; the first rotating roller shaft 24 and the second rotating roller shaft are both provided with a plurality of tooth columns 25, gaps are arranged between the tooth columns 25 of the first rotating roller shaft 24 and the tooth columns 25 of the second rotating roller shaft, the gaps are used for falling after the materials are crushed, and the material crushing cavity 21 is communicated with an inlet of the filter cake crusher 2. After the calcium carbonate filter cake enters the material crushing cavity 21, the first motor 22 drives the first speed reducer 23 to rotate the first rotating roller shaft 24, the second motor drives the second speed reducer to rotate the second rotating roller shaft, the filter cake is subjected to the meshing force action of the two rotating roller shafts, so that the material passes between the two rollers and is simultaneously squeezed and sheared by the two rotating roller shafts and the tooth posts 25 on the roller shafts, the filter cake starts to be cracked, the cracked small particles pass through the gap between the two rotating roller shafts along the tangent line of the roller shaft rotation and are thrown downwards, the large particle filter cake exceeding the gap is continuously crushed into small particles to be discharged. The filter cake is crushed, so that the large filter cake can be broken to facilitate drying, and the small particle size is generally 1cm-5 cm. The filter cake crusher 2 has small and even discharge granularity, simple structure, convenient maintenance and low production cost, realizes the requirement of quickly crushing the filter cake, and the water content of the calcium carbonate filter cake fed into the filter cake crusher 2 is 30-40 percent.
Filter cake dispersion mixes machine 3 and is double helix dispersion and mixes machine, and filter cake dispersion mixes machine 3 includes cavity 31 of filter cake dispersion and mixes machine 3 and locates two parallel arrangement's in the cavity 31 (mixing) shaft 32, and the cavity 31 of filter cake dispersion mixes machine 3 is U type cavity, and the interval is provided with a plurality of helical blade 33 on two (mixing) shaft 32, and two (mixing) shaft 32 all are connected with third speed reducer 34, and third speed reducer 34 is connected with third motor 35. The filter cake dispersion machine 3 can prevent the coagulation of the filter cake and is beneficial to the dispersion of the filter cake into small particles, the particle size of the filter cake particles discharged from the filter cake dispersion mixer is 0.1cm-3cm, the moisture is 18% -28%, the adhesion is not easy, and the dispersion and the drying are beneficial.
The system of the preferred embodiment further comprises a filter press 1, and a second conveyor belt 11 is provided between the outlet of the filter press 1 and the inlet of the filter cake crusher 2, the second conveyor belt 11 being used to feed the material discharged from the filter press 1 to the filter cake crusher 2.
Depolymerization drying module includes spin flash dryer 4, quick drying and break up the function, filter cake dispersion mixes the import of export intercommunication spin flash dryer 4 of machine 3, spin flash dryer 4 includes rotatory reducing mechanism, be used for breaking up the material depolymerization, the import of spin flash dryer 4 is seted up on spin flash dryer 4's cavity 41, be located rotatory reducing mechanism top, rotatory reducing mechanism includes crushing dish 42, the tup 43 of setting on crushing dish 42, be fixed in the dwang 44 of crushing dish 42 bottom, dwang 44 relies on the motor fourth motor 45 drive rotation promptly, thereby drive crushing dish 42 through belt 46 and rotate. When the wet material is fed into the spin flash dryer 4, the wet material is crushed by the rotary crushing device and is rapidly refined under the high-speed impact of the hammer heads 43 on the crushing disc 42. The bottom of the spin flash dryer 4 is communicated with hot air, the bottom of the spin flash dryer 4 is provided with a hot air inlet 47, and the hot air is used for drying materials and blowing the materials to an outlet 48 of the spin flash dryer 4. The high temperature air of spin flash dryer 4 below blows upwards, dries the material, and the material that refines is up along with hot-air, greatly increased the area of material and hot-air contact, makes the material dry in the twinkling of an eye, and its volume of material in dry crushing process constantly reduces, and under the effect of hot gas flow, fine powder discharges through the export 48 of spin flash dryer 4. The water content of the material discharged from the rotary flash evaporation dryer 4 is 0.3-1.0%, the temperature of hot air is 200-350 ℃, the temperature is too high, the material is easy to burn, and the whiteness of the product is influenced; the temperature is too low and the yield is low. The temperature of the discharged materials is 80-130 ℃, the temperature is too high, the materials are easy to burn, and the whiteness of the product is influenced; too low temperature, too high moisture and poor drying effect.
The grading module comprises a grader 5, the grader 5 in the embodiment is the stepless speed-regulating grader 5, an outlet of the rotary flash dryer 4 is communicated with an inlet of the grader 5, a coarse powder outlet of the grader 5 is communicated with an inlet of the filter cake dispersing mixer 3 through a pipeline, and fine powder discharged from a fine powder outlet of the grader 5 is sent to the separation and dust removal module. The classifier 5 can conveniently control the fineness of the product, the powder reaching the required fineness is collected, and the powder with the thickness not reaching the standard is sent into the filter cake dispersing mixer 3 for further crushing.
The dispersing and dedusting module comprises a cyclone separator 6 and a bag-type dust collector 7, a fine powder outlet of the classifier 5 is sequentially communicated with an inlet of the cyclone separator 6 and an inlet of the bag-type dust collector 7, the bag-type dust collector 7 is communicated with an induced draft fan 71, and fine powder discharged from an outlet of the cyclone separator 6 and an outlet of the bag-type dust collector 7 is sent into the secondary drying module.
The semi-finished product collecting module comprises a semi-finished product collecting hopper 81 and a star-shaped blanking machine 82, the outlet of the cyclone separator 6 and the outlet of the bag-type dust collector 7 are communicated with the semi-finished product collecting hopper 81, the outlet of the semi-finished product collecting hopper 81 is communicated with the inlet of the star-shaped blanking machine 82, and the outlet of the star-shaped blanking machine 82 is communicated with a feeding hopper 91 of the infrared microwave dryer 9.
The secondary drying module comprises an infrared microwave dryer 9, and the infrared microwave dryer 9 comprises a microwave generating device 93 and a far infrared heating device 94. The microwave infrared dryer 9 comprises a feed hopper 91, a box body 92, a microwave generating device 93 and a far infrared heating device 94, wherein the microwave generating device 93 and the far infrared heating device 94 are arranged on the side wall of the box body 92, and a microwave suppressor 95 is arranged at the starting end of the box body 92; the dehumidifier also comprises a dehumidifying device 96 communicated with the box body 92 and an exhaust fan 97 communicated with the dehumidifying device 96; a conveyor belt 98 is also included across the bin, the conveyor belt 98 being used to discharge material. The microwave infrared dryer 9 is used for drying by adopting a microwave-infrared interval type drying system, and centrifugally dehumidifying the microwave-infrared drying system to discharge moisture. The microwave is a high-frequency electromagnetic field wave, the heating is realized by mutually rubbing and heating water molecules contained in the excited object at a high speed, the heat is thoroughly conducted from inside to outside, and the microwave heating device has the characteristics of high temperature rise, high heat energy conversion efficiency and the like. Infrared drying, also known as radiant drying, is a drying method that uses infrared radiation to vaporize moisture in the dried material, because wet material and moisture have very wide absorption bands in the far infrared region, it has very strong absorption effect on some frequencies of far infrared rays in this region. The infrared microwave dryer 9 has the advantages of relatively low drying temperature, no residual moisture after drying, short drying time and the like, so that the moisture content of the finally dried calcium carbonate powder is below 0.2%.
The finished product collecting module comprises a lifting machine 101, a storage bin 102 and an automatic packaging machine 103 which are sequentially communicated, and an outlet of the infrared microwave dryer 9 is communicated with an inlet of the lifting machine 101. The nano calcium carbonate dry powder is sent into a storage bin 102 by a hoisting machine 101, then is packaged by an automatic packaging machine 103, and is packaged and sealed by a laminating bag with an inner container.
The drying depolymerization system of the ultralow-moisture nano calcium carbonate has the advantages of high drying speed, good drying quality, high energy utilization rate and no residual moisture in drying and drying, and the moisture content of the finally obtained calcium carbonate powder can be below 0.2%.
Example two:
the embodiment is a use method of the ultra-low moisture nano calcium carbonate drying and depolymerization system in the first embodiment, and the use method comprises the following steps:
s1: feeding the calcium carbonate filter cake into a filter cake crusher to crush to obtain a small filter cake with the particle size of 1cm-5cm, and then feeding the small filter cake into a filter cake dispersing mixer to further crush to obtain coarse powder with the particle size of 0.1cm-3 cm; wherein the calcium carbonate filter cake is discharged from the filter press, the water content of the filter cake is 35 percent, the calcium carbonate filter cake is conveyed to the filter cake crusher through a second conveyor belt, and the water content of coarse powder discharged by the filter cake dispersing mixer is 24 percent;
s2: feeding the coarse powder into a cavity of a rotary flash evaporation dryer, setting the temperature in the cavity to be 150 ℃, depolymerizing the coarse powder by a rotary crushing device, and introducing hot air at 280 ℃ into the cavity to blow the depolymerized and dried dry powder into a classifier;
s3: feeding the coarse dry powder discharged from the classifier into a filter cake dispersing mixer for re-crushing, sequentially feeding the fine dry powder discharged from the classifier into a separation and dust removal module for dust removal, and then collecting; wherein, the fine dry powder is collected by a semi-finished product collecting hopper, and at the moment, the moisture of the nano calcium carbonate powder is 0.55 percent;
s4: sending the collected fine dry powder into an infrared microwave dryer for secondary drying, firstly adjusting the temperature of the infrared microwave dryer to 60-90 ℃ for drying, then adjusting the temperature to 90-110 ℃ for drying, then adjusting the temperature to 60-90 ℃ for cooling, and using the infrared microwave dryer for secondary drying for 30-60 min to obtain low-moisture dry powder with the moisture content of less than or equal to 0.2%; wherein, the collected fine dry powder is sent to an infrared microwave dryer through a star-shaped blanking machine;
s5: and sealing the low-moisture dry powder in a film-coated bag with an inner container through a finished product collecting module.
The method of using the ultra-low moisture nano calcium carbonate drying and depolymerization system of the embodiment can control the moisture content of the calcium carbonate powder to be less than 0.2%, and can maintain good dispersibility of the powder.
The present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make various modifications without creative efforts from the above-described conception, and fall within the scope of the present invention.
Claims (10)
1. A drying and depolymerization system for nanometer calcium carbonate with ultralow moisture content is characterized by comprising a crushing module, a depolymerization and drying module, a grading module, a separation and dust removal module, a secondary drying module and a finished product collection module which are sequentially communicated;
the crushing module comprises a filter cake crusher and a filter cake dispersing mixer, the filter cake crusher is used for primary crushing of materials, the filter cake dispersing mixer is used for secondary crushing of the materials, a first conveying belt is arranged between an outlet of the filter cake crusher and an inlet of the filter cake dispersing mixer, and the first conveying belt is used for conveying the materials discharged from the filter cake crusher into the filter cake dispersing mixer;
the depolymerization drying module comprises a rotary flash evaporation dryer, an outlet of the filter cake dispersion mixer is communicated with an inlet of the rotary flash evaporation dryer, the rotary flash evaporation dryer comprises a rotary crushing device and is used for depolymerizing the materials, the bottom of the rotary flash evaporation dryer is communicated with hot air, and the hot air is used for drying the materials and blowing the materials to the outlet of the rotary flash evaporation dryer;
the classifying module comprises a classifier, an outlet of the rotary flash evaporation dryer is communicated with an inlet of the classifier, a coarse powder outlet of the classifier is communicated with an inlet of the filter cake crusher through a pipeline, and fine powder discharged from a fine powder outlet of the classifier is sent to the separating and dedusting module;
the secondary drying module comprises an infrared microwave dryer, and the infrared microwave dryer comprises a microwave generating device and a far infrared heating device.
2. The ultra-low moisture nanocalcium carbonate drying and depolymerization system of claim 1, further comprising a filter press, wherein a second conveyor belt is disposed between an outlet from said filter press and an inlet of said filter cake crusher, said second conveyor belt being adapted to feed material exiting said filter press into said filter cake crusher.
3. The ultra-low moisture nano calcium carbonate drying and depolymerization system of claim 1, wherein the dispersion dust removal module comprises a cyclone separator and a bag-type dust remover, a fine powder outlet of the classifier is sequentially communicated with an inlet of the cyclone separator and an inlet of the bag-type dust remover, the bag-type dust remover is communicated with a draught fan, and fine powder discharged from an outlet of the cyclone separator and an outlet of the bag-type dust remover is sent to the secondary drying module.
4. The ultra-low moisture nano calcium carbonate drying and depolymerization system of claim 3, further comprising a semi-finished product collection module, wherein the semi-finished product collection module comprises a semi-finished product collection hopper and a star-shaped blanking machine, wherein the outlet of the cyclone separator and the outlet of the bag-type dust collector are communicated with the semi-finished product collection hopper, the outlet of the semi-finished product collection hopper is communicated with the inlet of the star-shaped blanking machine, and the outlet of the star-shaped blanking machine is communicated with the feed hopper of the infrared microwave dryer.
5. The ultra-low moisture nano calcium carbonate drying and depolymerizing system according to claim 1, wherein the finished product collecting module comprises a lifter, a storage bin and an automatic packaging machine which are sequentially communicated, and an outlet of the infrared microwave dryer is communicated with an inlet of the lifter.
6. The ultra-low moisture nano calcium carbonate drying and depolymerization system of claim 1, wherein the filter cake crusher is a double-toothed roller type filter cake crusher comprising a material crushing chamber, a first crushing device and a second crushing device, wherein the first crushing device is disposed opposite to the second crushing device;
the first crushing device comprises a first motor, a first speed reducer connected with the first motor and a first rotating roller shaft connected with an output shaft of the first speed reducer;
the second crushing device comprises a second motor, a second speed reducer connected with the second motor, and a second rotating roll shaft connected with an output shaft of the second speed reducer;
the first rotating roller shaft and the second rotating roller shaft are both provided with a plurality of tooth columns, gaps are arranged between the tooth columns of the first rotating roller shaft and the tooth columns of the second rotating roller shaft and used for crushing materials and falling after crushing, and the material crushing cavity is communicated with an inlet of the filter cake crusher.
7. The ultra-low moisture nano calcium carbonate drying and depolymerization system of claim 1, wherein the filter cake dispersion mixer is a double helix dispersion mixer, the filter cake dispersion mixer comprises a U-shaped cavity and two parallel stirring shafts arranged in the U-shaped cavity, a plurality of helical blades are arranged on the two stirring shafts at intervals, both the two stirring shafts are connected with a speed reducer, and the speed reducer is connected with a motor.
8. The ultra-low moisture nano calcium carbonate drying and depolymerizing system of claim 1, wherein the rotary crushing device of the rotary flash drying device comprises a crushing disk, a hammer head arranged on the crushing disk, and a rotating rod fixed at the bottom of the crushing disk, and the rotating rod is driven by a motor to rotate so as to drive the crushing disk to rotate.
9. The drying and depolymerization system for ultra-low moisture nano calcium carbonate according to claim 1, wherein the microwave infrared dryer includes a feed hopper, a box body, and a microwave generating device and a far infrared heating device arranged on the side wall of the box body, and a microwave suppressor is arranged at the starting end of the box body;
the dehumidifier also comprises a dehumidifying device communicated with the box body and an exhaust fan communicated with the dehumidifying device;
the device also comprises a conveying belt which transversely penetrates through the box body and is used for discharging materials.
10. The method of using the ultra-low moisture nanocalcium carbonate drying depolymerization system of any one of claims 1 to 9, including the steps of:
s1: feeding the calcium carbonate filter cake into a filter cake crusher to crush to obtain a small filter cake with the particle size of 1cm-5cm, and then feeding the small filter cake into a filter cake dispersing mixer to further crush to obtain coarse powder with the particle size of 0.1cm-3 cm;
s2: feeding the coarse powder into a cavity of a rotary flash evaporation dryer, setting the temperature in the cavity to be 150 ℃, depolymerizing the coarse powder by a rotary crushing device, and introducing hot air at 280 ℃ into the cavity to blow the depolymerized and dried dry powder into a classifier;
s3: feeding the coarse dry powder discharged from the classifier into a filter cake dispersing mixer for re-crushing, sequentially feeding the fine dry powder discharged from the classifier into a separation and dust removal module for dust removal, and then collecting;
s4: sending the collected fine dry powder into an infrared microwave dryer for secondary drying, firstly adjusting the temperature of the infrared microwave dryer to 60-90 ℃ for drying, then adjusting the temperature to 90-110 ℃ for drying, then adjusting the temperature to 60-90 ℃ for cooling, and using the infrared microwave dryer for secondary drying for 30-60 min to obtain low-moisture dry powder with the moisture content of less than or equal to 0.2%;
s5: and sealing the low-moisture dry powder in a film-coated bag with an inner container through a finished product collecting module.
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