CN111908495B - Production process of spherical calcium chloride dihydrate - Google Patents
Production process of spherical calcium chloride dihydrate Download PDFInfo
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- CN111908495B CN111908495B CN202010799716.8A CN202010799716A CN111908495B CN 111908495 B CN111908495 B CN 111908495B CN 202010799716 A CN202010799716 A CN 202010799716A CN 111908495 B CN111908495 B CN 111908495B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
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Abstract
The invention provides a production process of spherical calcium chloride dihydrate, which comprises the following steps: 1) Preparing seed crystals; 2) Atomizing the feed liquid; 3) Rotary granulation; 4) Fluidized drying; 5) And (4) screening and collecting. The method effectively solves the problems that crystals are easy to crack, the yield is low, and the crystals are easy to agglomerate in the production process to cause unstable operation and cannot be continuously produced for a long time in the prior art. According to the process, the fluidization air distribution plate is arranged in the rotary granulating device, the granulating and drying processes are completed in the same equipment, the particle fragmentation is effectively reduced, the drying and granulating processes are separately adjusted, the agglomeration is avoided, the long-time continuous production can be ensured, the integration level of the whole process is high, and the production efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of calcium chloride production, in particular to a production process of spherical calcium chloride dihydrate.
Background
Calcium chloride is a common industrial chemical, and is commonly used as a multipurpose desiccant, refrigerant, building antifreeze, lubricant additive, and the like.
In order to obtain calcium chloride dihydrate with higher purity in the existing industrial production, a high tower granulation process and a spray air distribution plate granulation process are widely applied at present. The high tower granulation process is that calcium chloride feed liquid is sent to the top of a granulation tower, is atomized, freely falls down, is cooled to separate out calcium chloride dihydrate, and then is sent to a grid plate for drying. The process has the disadvantages of insufficient utilization of heat, easy crystal fragmentation in the production process and low yield. Granulation and drying in the spray air distribution plate granulation process are simultaneously carried out in the air distribution plate layer, and because the air distribution plate has small operation elasticity, the operation is unstable due to easy caking in the production process, the long-time continuous production cannot be realized, and the power consumption of a fan is large.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to solve the problems that crystals are easy to crack in the production process, the yield is low, the operation is unstable due to easy caking in the production process, and the continuous production cannot be carried out for a long time in the prior art, and provides a production process of spherical calcium chloride dihydrate, wherein a fluidized air distribution plate is arranged in a rotary granulation device, so that the granulation and drying processes are completed in the same equipment, and the particle cracking is effectively reduced; the drying and granulating processes can be separately adjusted, so that caking is avoided, the rotary granulating device has high operation elasticity, and long-time continuous production can be ensured.
The invention adopts the following specific technical scheme for solving the technical problems: a production process of spherical calcium chloride dihydrate comprises the following steps:
1) Preparing seed crystals: adding calcium chloride crystal seeds into a rotatable rotary granulating device in advance, and allowing the crystal seeds to fall from a high position under the action of wind blowing and gravity after the crystal seeds are lifted along with the rotation of the rotary granulating device to form a material curtain;
2) Feed liquid atomization: feeding calcium chloride feed liquid into the rotary granulation device, atomizing the feed liquid, and uniformly covering the feed liquid on a material curtain formed by calcium chloride crystal seeds;
3) Rotary granulation: the atomized calcium chloride feed liquid is uniformly attached to the surface of the calcium chloride crystal seed, the feed liquid is solidified along with the reduction of the temperature, and the particle size of the calcium chloride crystal seed is gradually increased;
4) Fluidized drying: an air distribution plate is arranged in the rotary granulating device, granulated calcium chloride crystals are brought up and sprinkled on the air distribution plate along with the rotation of the rotary granulating machine, flowing air is heated and then sent to the position below the air distribution plate, the calcium chloride crystals on the air distribution plate are blown up to form a fluidized state, the calcium chloride crystals are dried at the same time, the air subjected to heat exchange drying takes away moisture generated by drying, the moisture is discharged out of the rotary granulating device in the form of tail gas, the blown and dried calcium chloride crystals are blown up again along with the rotation of the rotary granulating device after falling, and the process of the rotary granulating step is repeated;
5) Screening and collecting: after the calcium chloride crystal seeds are sprayed, covered and dried for many times, the calcium chloride crystals with the granularity and the moisture meeting the requirements are discharged from the discharge end of the rotary granulating device and then screened, and qualified products are collected.
Optionally, rotary granulation device includes riding wheel mechanism and rotatable barrel, riding wheel mechanism is used for supporting the barrel, the barrel is the tilting structure, and the feed end highly is higher than the discharge end, the barrel is inherent the relative position side of air distribution plate is equipped with the striker plate, the striker plate makes the curtain more even, the below of air distribution plate is provided with the nozzle for atomize the blowout with calcium chloride feed liquid, be equipped with the multiunit lifting blade along circumference on the internal surface of barrel for raise calcium chloride crystal on the air distribution plate, the air after the heating is followed in the fluidized drying step the below of air distribution plate is passed, and is right calcium chloride crystal on the air distribution plate is dried.
Furthermore, the air distribution plate is of an inclined structure, the height of one end close to the nozzle is lower, and the inclination angle is 5-30 degrees.
Optionally, the fluidized drying step further includes dust removal and recovery of calcium chloride materials in the tail gas discharged after drying.
Further, tail gas obtained after drying the calcium chloride crystals enters a dust removal recovery device from the upper part of the discharge end of the rotary granulation device and then is discharged into the atmosphere.
Furthermore, the dust removal recovery device comprises a cyclone dust collector, an induced draft fan and a wet dust collector, and the cyclone dust collector separates and collects calcium chloride materials in tail gas and then conveys the calcium chloride materials back to the rotary granulation device.
Furthermore, the tail gas is discharged from the cyclone dust collector and enters the wet dust collector for secondary dust collection, and the tail gas after dust collection is discharged into the atmosphere.
Optionally, in the screening and collecting step, a classifying screen is used for screening the calcium chloride crystals, the calcium chloride crystals with the diameter of 0.2mm to 10mm are used as finished products, the calcium chloride crystals with the diameter of more than 10mm and the diameter of less than 0.2mm are used as non-finished products, and the non-finished products pass through a recycling device and then are used as seed crystals to enter the rotary granulation device for recycling.
Furthermore, the recycling device comprises a crusher, a return material screw conveyor and a return material hopper lifter.
Optionally, the concentration of the calcium chloride feed liquid is 50 to 70%.
As described above, the present invention has at least the following advantageous effects compared to the closest prior art:
1. the fluidization air distribution plate is arranged in the rotary granulation device, granulation and drying processes are completed in the same equipment, and the rotary granulation device can effectively reduce particle fragmentation;
2. the drying and granulating processes can be separately adjusted, so that agglomeration is avoided, and long-time continuous production can be ensured;
3. the process integration level is high, and the production efficiency is improved.
Drawings
FIG. 1 shows a schematic process flow diagram of the present invention
FIG. 2 is a schematic view showing the inside structure of a rotary granulator according to the present invention
Description of the element reference
1. Rotary granulating device
2. Air distribution plate
3. Classifying screen
4. Dust removal recovery device
5. Recycling device
12. Material raising plate
13. Nozzle with a nozzle body
14. Barrel body
15. Riding wheel mechanism
16. Striker plate
41. Cyclone dust collector
42. Draught fan
43. Wet dust collector
51. Crushing machine
52. Material returning screw conveyor
53. Return hopper lifting machine
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
The structures, ratios, sizes, and the like of the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the efficacy and the achievable purpose of the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The following examples are for illustrative purposes only. The various embodiments may be combined, and are not limited to what is presented in the following single embodiment.
In the present embodiment of the present invention,
referring to fig. 1 and 2, the present invention provides a process for producing spherical calcium chloride dihydrate, comprising the following steps:
1) Preparing seed crystals: the calcium chloride crystal seeds are added into the rotary granulating device 1 in advance, the rotary granulating device 1 comprises a supporting wheel mechanism 15 and a rotatable barrel 14, the supporting wheel mechanism 15 is used for supporting the barrel 14, the barrel 14 is of an inclined structure, and the height of a feeding end is higher than that of a discharging end. With the adoption of the design, materials can be moved from the feeding end to the discharging end along the axial direction when the barrel body 14 rotates.
This embodiment passes through the motor and drives barrel 14 rotates, barrel 14 internal fixation has air distribution plate 2, air distribution plate 2 does not follow barrel 14 rotates the position side that air distribution plate 2 is relative is equipped with striker plate 16, be equipped with a plurality of sets of lifting blades 12 along circumference on barrel 14's the internal surface, along with barrel 14's rotation, calcium chloride seed crystal quilt in the barrel 14 the lifting blades 12 is raised and is unrestrained on air distribution plate 2, then follows under the effect of wind-blowing and gravity the air distribution plate 2 goes up and falls, forms even curtain under the effect that the shape is curved striker plate 16.
2) Feed liquid atomization: the concentrated calcium chloride feed liquid is sent into the rotary granulation device 1 through a pipeline under the action of a pump, the calcium chloride feed liquid can be calcium chloride solution with the concentration of 50-70%, the calcium chloride feed liquid with the concentration of 68% is adopted in the embodiment, a nozzle 13 is arranged below the air distribution plate 2 according to a certain rule, and the calcium chloride feed liquid is atomized by the nozzle 13 and then sprayed out to uniformly cover a material curtain formed by the seed crystals.
3) Rotary granulation: the temperature of the atomized calcium chloride feed liquid is reduced, the calcium chloride feed liquid is rapidly solidified on the surface of the crystal seeds, the crystal seeds are lifted by the lifting plate 12 again along with the rotation of the cylinder 14 and fall on the air distribution plate 2, and after the crystal seeds are repeatedly dropped, lifted, sprayed, covered and solidified, the particle size of calcium chloride crystals is continuously increased.
4) Fluidized drying: the natural air is compressed and then heated, the heated calcium chloride passes through the calcium chloride crystals on the air distribution plate 2 from the bottom as fluidizing air, the granulated calcium chloride crystals are blown into a fluidized state, meanwhile, the calcium chloride crystals are dried and then the moisture is taken away, and tail gas is discharged from the discharge end of the rotary granulating device 1. The calcium chloride crystals are dried in the air distribution plate 2, so that the granulation and drying processes are completed in the same equipment, the particle fragmentation is effectively reduced, and the yield of the calcium chloride crystals is improved.
By adopting the method, the rotary granulation process and the air distribution plate fluidized drying process are separately carried out, the regulation and the control are easy, the material agglomeration is avoided, the long-time continuous production can be realized, the integration level of the whole process is higher, and the production efficiency is improved.
5) Screening and collecting: and calcium chloride crystals are discharged from the discharge end of the rotary granulating device 1 and then screened by a classifying screen 3, and qualified products are collected.
In the present embodiment, the first and second electrodes are,
referring to fig. 1 and 2, the grid plate 2 is of an inclined structure, the angle of inclination is 5 to 30 °, and the height of the end close to the nozzle 13 is lower. The angle of inclination of the grid 2 of this embodiment is 5 °.
The design can utilize the gravity of the material to flow downwards, does not need to maintain the state of the high bed layer air distribution plate, has low power consumption and is favorable for forming a more uniform material curtain.
In the present embodiment of the present invention,
referring to fig. 1 and 2, the angle of inclination of the air distribution plate 2 of the present embodiment is 30 °, and a calcium chloride solution with a concentration of 50% is selected. Discharged tail gas gets into dust removal recovery unit 4 behind the dry calcium chloride crystal in the fluidized drying step, dust removal recovery unit 4 includes cyclone 41, draught fan 42 and wet dust collector 43, cyclone 41 separates the calcium chloride material in with the tail gas and the air, and the material of once collecting after removing dust is sent into as the seed crystal gyration prilling granulator 11 continues to use, has avoided extravagant. And tail gas discharged by the cyclone dust collector 41 enters the wet dust collector 43 for secondary dust collection under the action of the induced draft fan 42, and the tail gas subjected to secondary dust collection is discharged into the atmosphere. The tail gas after two-stage dust removal has better cleanliness, and avoids the pollution to the atmosphere.
In the present embodiment, the first and second electrodes are,
referring to fig. 1 and 2, in the embodiment, the inclination angle of the air distribution plate 2 is 15 °, and a calcium chloride solution with a concentration of 70% is selected. And in the screening and collecting step, the calcium chloride crystals are screened by adopting a grading screen 3, the calcium chloride crystals with the diameter of 0.2mm to 10mm are used as finished products, and the finished products are collected and packaged. Calcium chloride crystals with the diameter of more than 10mm and the diameter of less than 0.2mm are used as non-finished products and enter a recycling device 5. The recycling device 5 comprises a crusher 51, a return screw conveyor 52 and a return hopper lifter 53, wherein large-particle crystals in non-finished products are crushed by the crusher 51 and then return to the rotary granulating device 1 together with fine-particle crystals under the action of the return screw conveyor 52 and the return hopper lifter 53, and the large-particle crystals are continuously used as seed crystals. By adopting the mode, the non-finished product is converted into the crystal seed for continuous use, so that the material is saved, and the waste is avoided.
In conclusion, the invention effectively reduces the particle fragmentation and improves the yield; the drying and granulating processes are separately adjusted, so that caking is avoided, long-time continuous production can be realized, and the production efficiency is improved; materials and non-finished products in the tail gas are recycled, so that atmospheric pollution is reduced, and material waste is avoided. Therefore, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. A production process of spherical calcium chloride dihydrate is characterized by comprising the following steps:
1) Preparing seed crystals: adding calcium chloride crystal seeds into a rotatable rotary granulating device in advance, and allowing the crystal seeds to fall from a high position under the action of wind blowing and gravity after the crystal seeds are lifted along with the rotation of the rotary granulating device to form a material curtain;
2) Feed liquid atomization: feeding calcium chloride feed liquid into the rotary granulation device, atomizing the feed liquid, and uniformly covering the feed liquid on a material curtain formed by calcium chloride crystal seeds;
3) Rotary granulation: the atomized calcium chloride feed liquid is uniformly attached to the surface of the calcium chloride crystal seed, the feed liquid is solidified along with the reduction of the temperature, and the particle size of the calcium chloride crystal seed is gradually increased;
4) Fluidized drying: an air distribution plate is arranged in the rotary granulating device, granulated calcium chloride crystals are brought up and sprinkled on the air distribution plate along with the rotation of the rotary granulating machine, flowing air is heated and then sent to the position below the air distribution plate, the calcium chloride crystals on the air distribution plate are blown up to form a fluidized state, the calcium chloride crystals are dried at the same time, the air subjected to heat exchange drying takes away moisture generated by drying, the moisture is discharged out of the rotary granulating device in the form of tail gas, the blown and dried calcium chloride crystals are blown up again along with the rotation of the rotary granulating device after falling, and the process of the rotary granulating step is repeated;
5) Screening and collecting: after the calcium chloride crystal seeds are sprayed, covered and dried for multiple times, the calcium chloride crystals with the granularity and the moisture meeting the requirements are discharged from the discharge end of the rotary granulating device and then screened, and qualified products are collected;
the rotary granulating device comprises a supporting wheel mechanism and a rotatable barrel, wherein the supporting wheel mechanism is used for supporting the barrel, the barrel is of an inclined structure, the feeding end is higher than the discharging end, the barrel is internally provided with a baffle plate on the side face of the position, opposite to the air distribution plate, of the air distribution plate, the baffle plate enables a material curtain to be more uniform, a nozzle is arranged below the air distribution plate and is used for atomizing and spraying calcium chloride feed liquid, a plurality of groups of lifting plates are arranged on the inner surface of the barrel along the circumferential direction and are used for lifting calcium chloride crystals onto the air distribution plate, and air heated in the fluidized drying step is passed through the lower part of the air distribution plate and is dried by the calcium chloride crystals on the air distribution plate.
2. The production process of spherical calcium chloride dihydrate as claimed in claim 1, wherein the air distribution plate is of an inclined structure, the height of one end close to the nozzle is lower, and the inclination angle is 5 to 30 °.
3. The process for producing spherical calcium chloride dihydrate according to claim 1, wherein the fluidized drying step further comprises dust removal and recovery of calcium chloride material in the tail gas discharged after drying.
4. The process for producing spherical calcium chloride dihydrate according to claim 3, wherein the tail gas obtained by drying the calcium chloride crystals enters a dust removal and recovery device from the upper part of the discharge end of the rotary granulation device and is discharged into the atmosphere.
5. The spherical calcium chloride dihydrate production process of claim 4, wherein the dust removal and recovery device comprises a cyclone dust collector, an induced draft fan and a wet dust collector, and the cyclone dust collector separates and collects calcium chloride materials in tail gas and conveys the calcium chloride materials back to the rotary granulation device.
6. The process for producing spherical calcium chloride dihydrate according to claim 5, wherein the tail gas is discharged from the cyclone dust collector and then enters the wet dust collector for secondary dust removal, and the tail gas after secondary dust removal is discharged into the atmosphere under the action of the induced draft fan.
7. The production process of spherical calcium chloride dihydrate as claimed in claim 1, wherein in the screening and collecting step, the calcium chloride crystals are screened by a classifying screen, the calcium chloride crystals with the diameter of 0.2mm to 10mm are used as finished products, the calcium chloride crystals with the diameter of more than 10mm and the diameter of less than 0.2mm are used as non-finished products, and the non-finished products are recycled and reused as seed crystals in the rotary granulating device.
8. The process for producing spherical calcium chloride dihydrate according to claim 7, wherein the recycling apparatus comprises a crusher, a return screw conveyor and a return hopper lifter.
9. The process for producing spherical calcium chloride dihydrate according to any one of claims 1 to 8, wherein the concentration of the calcium chloride solution is 50 to 70%.
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| CN103028343B (en) * | 2012-12-18 | 2015-07-29 | 天津大学 | A kind of production method of pelletoidal calcium chloride dihydrate |
| CN206511932U (en) * | 2017-02-15 | 2017-09-22 | 山东天成万丰化工科技有限公司 | A kind of graininess anhydrous calcium chloride continuous production device |
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