CN115060045A - Method for drying anhydrous lithium chloride - Google Patents
Method for drying anhydrous lithium chloride Download PDFInfo
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- CN115060045A CN115060045A CN202210520479.6A CN202210520479A CN115060045A CN 115060045 A CN115060045 A CN 115060045A CN 202210520479 A CN202210520479 A CN 202210520479A CN 115060045 A CN115060045 A CN 115060045A
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- 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
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
- F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
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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
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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
- F26B21/003—Supply-air or gas filters
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- F26B21/50—
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
本发明提供一种干燥无水氯化锂的方法。所述干燥无水氯化锂的方法包括以下步骤：步骤A：离心分离；步骤B：空气干燥；步骤C：空气除湿；步骤D：物料流化；步骤E：物料干燥；步骤F：旋风除尘；步骤G：湿式除尘；步骤H：物料分级；步骤I：物料包装。本发明的干燥无水氯化锂的方法，生产工艺简单，大幅提高产品的产量、生产工艺的安全性、杜绝黑点和异物，产品颗粒度更加均匀，是一种安全、经济的干燥无水氯化锂的方法。
The present invention provides a method for drying anhydrous lithium chloride. The method for drying anhydrous lithium chloride includes the following steps: step A: centrifugal separation; step B: air drying; step C: air dehumidification; step D: material fluidization; step E: material drying; step F: cyclone dust removal ; Step G: wet dust removal; Step H: material classification; Step I: material packaging. The method for drying anhydrous lithium chloride of the present invention has the advantages of simple production process, greatly improves the output of the product, the safety of the production process, eliminates black spots and foreign matter, and the particle size of the product is more uniform, which is a safe and economical dry anhydrous method. Lithium chloride method.
Description
Technical Field
The invention relates to a drying method of a lithium compound, in particular to a drying method of anhydrous lithium chloride.
Background
The anhydrous lithium chloride is a white regular crystal with a sodium chloride type face-centered lattice, is salty in taste, has deliquescence, is easily soluble in organic solvents such as water, methanol, ethanol, acetone, pyridine and the like, is an inorganic compound, and belongs to the field of inorganic salt chemical industry. Lithium chloride is widely applied to the fields of manufacturing welding materials, air conditioning equipment, fireworks, biomedicine, environmental protection, dry batteries, electrolytic lithium metal and the like.
The lithium chloride molten salt is mainly electrolyzed to produce the metal lithium in industry, and the water content of the lithium chloride solid is crucial to the safety of the metal lithium electrolysis process. At present, most of the anhydrous lithium chloride is dried in domestic industry by using a disc type dryer, and although the disc type dryer has short process flow and simple operation, a plurality of problems still exist. Firstly, the drying temperature in the disc type dryer is high, mineral oil is usually adopted as an energy carrier, electric heating is used, the temperature is up to 250-300 ℃, the mineral oil steam is combustible and explosive, the operation is dangerous, and the heat efficiency of the heat-conducting oil furnace is only 50-60%; secondly, the harrow bar rotates to drive the metal harrow blades to scrape the fixed metal heating plate, the generated metal powder is brought into the product, black spots in the product are increased, and the whiteness of the product is reduced; thirdly, in the material distribution process, the anhydrous lithium chloride wet material is easy to directly fall into the last layer of cooling disc from the outermost end of the metal heating disc and reaches a discharge hole without being dried, so that the moisture content of the product is uneven and even exceeds the standard; fourthly, the material distribution of the material distribution disc and the heating disc is uneven, caking materials are easy to generate, the water content of the caking materials can exceed the standard, and the caking materials are directly used for electrolysis and can be subjected to bumping; fifthly, the rotation of the harrow bar and the harrow blade needs to be rotated by external force, the failure rate of the equipment is high, the space in the equipment is narrow, and the maintenance is inconvenient; sixthly, tail gas of the equipment is directly discharged without a tail gas dust collecting device, so that materials are wasted, and the environment is not up to the standard. In addition, the device and the technology for spray drying are used industrially, but the device and the technology also have the serious defects of small scale, low yield, low energy utilization rate and the like.
Therefore, there is a high necessity for a new method for drying lithium chloride, which is environmentally friendly, has high productivity, and does not introduce foreign materials.
Disclosure of Invention
Based on the method, the invention provides the method for drying the anhydrous lithium chloride, which is simple and convenient to operate, low in cost, capable of effectively overcoming the defects of the traditional method, better in whiteness of the product, more uniform in particles, capable of grading and high in energy utilization rate.
The invention provides a method for drying anhydrous lithium chloride, which comprises the following steps:
step A, centrifugal separation: after centrifugal separation, lithium chloride crystal slurry with certain concentration enters a screw conveyor and is conveyed into a dryer;
step B, drying air: removing dirt such as micro dust and the like from a certain amount of fresh air through a filter, sending the air into an air heater, heating to 130-150 ℃, keeping the temperature constant, and starting an automatic temperature control system to keep the temperature unchanged after the air is preheated;
step C, air dehumidification: removing dirt such as micro dust and the like from a certain amount of fresh air through a filter, sending the air into an air dehumidifying unit, cooling to 10-15 ℃, keeping the temperature constant, simultaneously reducing the RH to be not higher than 10%, and starting an automatic humidity control system to keep the humidity of the part of air stable;
d, material fluidization: conveying the anhydrous lithium chloride wet material obtained in the step A and the dry air obtained in the step B into a fluidized bed dryer simultaneously, so that the anhydrous lithium chloride wet material is in a normal fluidization state in the dry air flow, namely observing through a test-mirror observation hole, adjusting the opening degree of a valve of hot air, keeping a material layer to reach a certain thickness, and keeping a certain fluidization speed of the lithium chloride material in the fluidized bed;
and E, drying the materials: d, controlling the fluidization time of the material obtained in the step D in a fluidized bed for 20-45 minutes, drying anhydrous lithium chloride, cooling the dried material by the air dehumidified in the step C to be not higher than 65 ℃, discharging the material out of the fluidized bed, and keeping the temperature of the cooled material stable by an automatic control system;
step F, cyclone dust removal: continuously discharging dry anhydrous lithium chloride by the fluidized bed dryer in the step E, and simultaneously discharging primary dust-containing tail gas, wherein the primary dust-containing tail gas is conveyed to the cyclone dust collector, under the combined action of self gravity and centrifugal force of the primary dust-containing tail gas in the cyclone dust collector, lithium chloride dust is settled along the inner wall of the cyclone dust collector and discharged from a discharge port, so that most fine particle products in the primary dust-containing tail gas are collected, and secondary dust-containing tail gas treated by the cyclone dust collector is discharged from the cyclone dust collector;
step G, wet dust removal: conveying the secondary dust-containing tail gas discharged by the cyclone dust collector in the step F into a wet dust collector, contacting a lithium chloride solution circulated from the bottom of the wet dust collector with the secondary dust-containing tail gas in a packing layer to generate gas-liquid mixing and absorption, absorbing most of lithium chloride dust in the secondary dust-containing gas, allowing the solution after dust absorption to fall into the bottom of the dust collector to participate in circulation again, circulating to a certain concentration, conveying to a corresponding process for treatment, and discharging the tertiary tail gas after being treated by the wet dust collector from the top after reaching the standard;
step H, material classification: e, collecting the bulk material discharged from a discharge port at the bottom of the fluidized bed by a ton bag, transferring the bulk material to a re-dissolving process for re-dissolving, grading the solid lithium chloride discharged in the step E by a vibrating screen, and collecting the top oversize material, the middle undersize material and the bottom undersize material according to different customer requirements respectively;
step I, packaging materials: and D, respectively collecting the solid materials obtained in the step H, then performing exhaust packaging according to different customer requirements, dividing the solid materials into ton bag packaging, large packaging, small packaging and the like, and after packaging, backing up and winding the solid materials.
Further, the concentration of the lithium chloride crystal slurry in the step A is 10-40%, and after centrifugal separation, the humidity of the lithium chloride solid is less than or equal to 3%.
Further, the air volume of the fresh air in the step B is 5000- 3 The air pressure is 6000-9000PaG, and the temperature is raised to 130-150 ℃.
Further, the air volume of the fresh air in the step C is 2000-4000m 3 The air pressure is 6000-9000PaG, the temperature is reduced to 10-15 ℃, and the humidity RH is not higher than 10%.
Furthermore, the thickness of the material layer in the normal fluidization state in the step D is 15-30cm, and the fluidization speed is 0.6-1.2 m/s.
And furthermore, in the step E, the material is fluidized in the fluidized bed for 20-45 minutes, and is discharged out of the fluidized bed at the temperature of below 65 ℃ after being cooled.
Further, the dust content of the third-stage dust-containing gas discharged in the step G is less than or equal to 10mg/m 3 。
Further, the packaging weight of the solid materials in the step I is 15-1000 kg.
Compared with the prior art, the invention has the following advantages:
the method for drying anhydrous lithium chloride comprises the steps that firstly, materials are directly contacted with hot air to generate mass transfer and heat transfer, the operation temperature is about 110 ℃, a non-disc type dryer adopts electric heating mineral oil, partition wall heat transfer is carried out, and the temperature is as high as 260 ℃ and 300 ℃; secondly, the heat source adopts water vapor, so that the fuel is non-combustible and non-explosive; thirdly, the air heater has high total heat transfer coefficient and small heating area, so the energy utilization rate is high; fourthly, materials are contacted with hot air in the drying process, so that black spots cannot be introduced, unlike a disc dryer, a rake rod rotates to drive metal rake blades to scrape a fixed metal heating disc, the generated metal powder is brought into the product, the black spots of the product are increased, and the whiteness of the product is reduced; fifthly, the whole drying process has no short circuit phenomenon, and the moisture content of the product is not uniform or even exceeds the standard; sixthly, the material distribution is more uniform, and caking materials are not easy to generate; seventhly, the equipment has high drying efficiency, so the processing capacity is high, and the inspection and maintenance are more convenient; eighthly, the equipment has a tail gas dust collecting device, saves materials, and is environment-friendly and up to standard.
Drawings
FIG. 1 is a process flow diagram of the method of drying anhydrous lithium chloride of the present invention.
Detailed description of the invention
The technical solutions in the embodiments of the present invention will be made clear and fully described below with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a method for drying anhydrous lithium chloride, comprising the steps of:
step A, centrifugal separation: after centrifugal separation, lithium chloride crystal slurry with certain concentration enters a screw conveyor and is conveyed into a dryer;
step B, drying air: removing dirt such as micro-dust and the like from a certain amount of fresh air through a filter, sending the air into an air heater, heating to 130-150 ℃, keeping the temperature constant, and starting an automatic temperature control system to keep the temperature unchanged after the air is preheated;
step C, air dehumidification: removing dirt such as micro-dust and the like from a certain amount of fresh air through a filter, sending the air into an air dehumidifying unit, cooling to 10-15 ℃, keeping the temperature constant, simultaneously reducing the absolute humidity to be not higher than 10%, and starting an automatic humidity control system to keep the humidity of the part of air stable;
d, material fluidization: conveying the anhydrous lithium chloride wet material obtained in the step A and the dry air obtained in the step B into a fluidized bed dryer simultaneously, so that the anhydrous lithium chloride wet material is in a normal fluidization state in the dry air flow, namely observing through a test-mirror observation hole, adjusting the opening degree of a valve of hot air, keeping a material layer to reach a certain thickness, and keeping a certain fluidization speed of the lithium chloride material in the fluidized bed;
and E, drying the materials: d, controlling the fluidization time of the material obtained in the step D in a fluidized bed for 20-45 minutes, drying anhydrous lithium chloride, cooling the dried material by the air dehumidified in the step C to be not higher than 65 ℃, discharging the material out of the fluidized bed, and keeping the temperature of the cooled material stable by an automatic control system;
step F, cyclone dust removal: continuously discharging dry anhydrous lithium chloride by the fluidized bed dryer in the step E, and simultaneously discharging primary dust-containing tail gas, wherein the primary dust-containing tail gas is conveyed to the cyclone dust collector, under the combined action of self gravity and centrifugal force of the primary dust-containing tail gas in the cyclone dust collector, lithium chloride dust is settled along the inner wall of the cyclone dust collector and discharged from a discharge port, so that most fine particle products in the primary dust-containing tail gas are collected, and secondary dust-containing tail gas treated by the cyclone dust collector is discharged from the cyclone dust collector;
step G, wet dust removal: conveying the secondary dust-containing tail gas discharged by the cyclone dust collector in the step F into a wet dust collector, contacting a lithium chloride solution circulated from the bottom of the wet dust collector with the secondary dust-containing tail gas in a packing layer to generate gas-liquid mixing and absorption, absorbing most of lithium chloride dust in the secondary dust-containing gas, allowing the solution after dust absorption to fall into the bottom of the dust collector to participate in circulation again, circulating to a certain concentration, conveying to a corresponding process for treatment, and discharging the tertiary tail gas after the tertiary tail gas treated by the wet dust collector reaches the standard from the top;
step H, material classification: e, collecting the bulk material discharged from a discharge port at the bottom of the fluidized bed by a ton bag, transferring the bulk material to a re-dissolving process for re-dissolving, grading the solid lithium chloride discharged in the step E by a vibrating screen, and collecting the top oversize material, the middle undersize material and the bottom undersize material according to different customer requirements respectively;
step I, packaging materials: respectively collecting the solid materials obtained in the step H, then performing exhaust packaging according to different customer requirements, and dividing the solid materials into ton bag packaging, large packaging and small packaging, and performing support and film wrapping after packaging;
further, the concentration of the lithium chloride crystal slurry in the step A is 10-40%, and after centrifugal separation, the humidity of the lithium chloride solid is less than or equal to 3%.
Further, the air volume of the fresh air in the step B is 5000- 3 The air pressure is 6000-9000PaG, and the temperature is raised to 130-150 ℃.
Further, the air volume of the fresh air in the step C is 2000-4000m 3 The air pressure is 6000-9000PaG, the temperature is reduced to 10-15 ℃, and the humidity RH is not higher than 10%.
Further, the thickness of the material layer in the normal fluidization state in the step D is 15-30cm, and the fluidization speed is 0.6-1.2 m/s.
Further, the material in the step E is fluidized in the fluidized bed for 20-45 minutes, and is discharged out of the fluidized bed at the temperature of not higher than 65 ℃ after cooling.
Further, the dust content of the third-stage dust-containing gas discharged in the step G is less than or equal to 10mg/m 3 。
Further, the packaging weight of the solid material in the step I is 15-1000 Kg.
Compared with the prior art, the invention has the following advantages:
the method for drying anhydrous lithium chloride comprises the steps that firstly, materials are directly contacted with hot air to generate mass transfer and heat transfer, the operation temperature is about 110 ℃, a non-disc type dryer adopts electric heating mineral oil, partition wall heat transfer is carried out, and the temperature is as high as 260 ℃ and 300 ℃; secondly, the heat source adopts water vapor, so that the fuel is non-combustible and non-explosive; thirdly, the air heater has high total heat transfer coefficient and small heating area, so the energy utilization rate is high; fourthly, materials are contacted with hot air in the drying process, so that black spots cannot be introduced, unlike a disc dryer, a rake rod rotates to drive metal rake blades to scrape a fixed metal heating disc, the generated metal powder is brought into the product, the black spots of the product are increased, and the whiteness of the product is reduced; fifthly, the whole drying process has no short circuit phenomenon, and the moisture content of the product is not uniform or even exceeds the standard; sixthly, the material distribution is more uniform, and caking materials are not easy to generate; seventhly, the equipment has high drying efficiency, so the processing capacity is high, and the inspection and maintenance are more convenient; eighthly, the equipment has a tail gas dust collecting device, saves materials, and is environment-friendly and up to standard.
In a specific example, the drying operation of anhydrous lithium chloride was carried out according to the values indicated in the following table and according to the procedure described previously:
the implementation conditions are as follows:
| example one | Example two | EXAMPLE III | Example four | |
| Degree of LiCl crystal slurry (%) | 12 | 10 | 15 | 13 |
| Raw material quantity (kg) | 2000 | 2000 | 2000 | 2000 |
| Water content of raw Material (%) | 2.1 | 2.2 | 2.1 | 2.1 |
| Temperature of raw Material (. degree.C.) | 106 | 102 | 104 | 105 |
| Drying temperature (. degree.C.) | 112 | 110 | 111 | 112 |
| Cold air humidity (g/l) | 8 | 9 | 9 | 10 |
| Cooling temperature (. degree.C.) | 10 | 10 | 11 | 10 |
| Discharge temperature (. degree.C.) | 61 | 62 | 63 | 62 |
| Exhaust gas temperature (. degree. C.) | 76 | 75 | 77 | 76 |
| Output volume (kg) | 1468 | 1485 | 1432 | 1455 |
| Dust content of tail gas (mg/m) 3 ） | 10 | 9 | 9 | 10 |
Under the implementation conditions, the results of the quality analysis of the anhydrous lithium chloride products are summarized as follows:
| example one | Example two | EXAMPLE III | Example four | Reference standard | |
| LiCl（%） | 98.84 | 99.12 | 99.01 | 98.94 | ≥98.5 |
| H 2 O（%） | 0.32 | 0.26 | 0.23 | 0.27 | ≤0.5 |
| Whiteness (wb) | 75.35 | 76.16 | 74.27 | 75.34 | ≥60 |
| Mg（ppm） | 0.36 | 0.48 | 0.39 | 0.42 | ≤15 |
| K（ppm） | 1524 | 1493 | 1517 | 1505 | ≤3000 |
| Na（ppm） | 1458 | 1483 | 1524 | 1511 | ≤2500 |
| Ca（ppm） | 52 | 61 | 63 | 60 | ≤200 |
| Fe（ppm） | 0.37 | 0.27 | 0.28 | 0.31 | ≤2 |
| SO 4 2- （ppm） | 68 | 66 | 69 | 67 | ≤200 |
As can be seen from the table above, the quality of the dried anhydrous lithium chloride product is higher than the industrial standard by one grade, especially the values of moisture and whiteness, and the anhydrous lithium chloride product can completely meet the requirements of lithium chloride electrolysis in industry.
Compared with the prior art, the invention has the following advantages:
the method for drying anhydrous lithium chloride comprises the steps that firstly, materials are directly contacted with hot air to generate mass transfer and heat transfer, the operation temperature is about 110 ℃, a non-disc type dryer adopts electric heating mineral oil, partition wall heat transfer is carried out, and the temperature is as high as 260 ℃ and 300 ℃; secondly, the heat source adopts water vapor, so that the fuel is non-combustible and non-explosive; thirdly, the air heater has high total heat transfer coefficient and small heating area, so the energy utilization rate is high; fourthly, the materials are contacted with hot air in the drying process, so that black spots cannot be introduced, unlike a disc type dryer, a rake rod rotates to drive metal rake blades to scrape the fixed metal heating disc, the generated metal powder is brought into the product, the black spots of the product are increased, and the whiteness of the product is reduced; fifthly, the whole drying process has no short circuit phenomenon, and the moisture content of the product is not uniform or even exceeds the standard; sixthly, the material distribution is more uniform, and caking materials are not easy to generate; seventhly, the equipment has high drying efficiency, so the treatment capacity is high, and the inspection and maintenance are more convenient; eighthly, the equipment has a tail gas dust collecting device, saves materials, and is environment-friendly and up to standard.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or that certain features may be substituted for those skilled in the art, and all changes, equivalents, and improvements that fall within the spirit and scope of the invention are therefore intended to be embraced by the appended claims.
Claims (8)
1. A method of drying anhydrous lithium chloride, characterized by: the method comprises the following steps:
step A: after centrifugal separation, lithium chloride crystal slurry with certain concentration enters a screw conveyor and is conveyed into a dryer;
and B, step B: removing dirt such as micro-dust and the like from a certain amount of fresh air through a filter, sending the air into an air heater, heating to 130-150 ℃, keeping the temperature constant, and starting an automatic temperature control system to keep the temperature unchanged after the air is preheated;
and C: removing dirt such as micro dust and the like from a certain amount of fresh air through a filter, sending the air into an air dehumidifying unit, cooling to 10-15 ℃, keeping the temperature constant, simultaneously reducing the RH to be not higher than 10%, and starting an automatic humidity control system to keep the humidity of the part of air stable;
step D: conveying the anhydrous lithium chloride wet material obtained in the step A and the dry air obtained in the step B into a fluidized bed dryer simultaneously, so that the anhydrous lithium chloride wet material is in a normal fluidization state in the dry air flow, namely observing through a test-mirror observation hole, adjusting the opening degree of a valve of hot air, keeping a material layer to reach a certain thickness, and keeping a certain fluidization speed of the lithium chloride material in the fluidized bed;
step E: d, controlling the fluidization time of the material obtained in the step D in the fluidized bed to be 20-45 minutes, drying anhydrous lithium chloride, cooling the dried material by the air dehumidified in the step C to be below 65 ℃, discharging the material out of the fluidized bed, wherein the discharging temperature of the material is an automatic control system, and keeping the temperature of the cooled material stable;
step F: continuously discharging dry anhydrous lithium chloride by the fluidized bed dryer in the step E, and simultaneously discharging primary dust-containing tail gas, wherein the primary dust-containing tail gas is conveyed to the cyclone dust collector, under the combined action of self gravity and centrifugal force of the primary dust-containing tail gas in the cyclone dust collector, lithium chloride dust is settled along the inner wall of the cyclone dust collector and discharged from a discharge port, so that most fine particle products in the primary dust-containing tail gas are collected, and secondary dust-containing tail gas treated by the cyclone dust collector is discharged from the cyclone dust collector;
step G: conveying the secondary dust-containing tail gas discharged by the cyclone dust collector in the step F into a wet dust collector, contacting a lithium chloride solution circulated from the bottom of the wet dust collector with the secondary dust-containing tail gas in a packing layer to generate gas-liquid mixing and absorption, absorbing most of lithium chloride dust in the secondary dust-containing gas, allowing the solution after dust absorption to fall into the bottom of the dust collector to participate in circulation again, circulating to a certain concentration, conveying to a corresponding process for treatment, and discharging the tertiary tail gas treated by the wet dust collector from the top;
step H: e, collecting the bulk material discharged from a discharge port at the bottom of the fluidized bed by a ton bag, transferring the bulk material to a re-dissolving process for re-dissolving, grading the solid lithium chloride discharged in the step E by a vibrating screen, and collecting the top oversize material, the middle undersize material and the bottom undersize material according to different customer requirements respectively;
step I: and D, respectively collecting the solid materials obtained in the step H, then performing exhaust packaging, ton bag packaging, large packaging and small packaging according to different customer requirements, and after packaging, supporting and winding the film.
2. A method of drying anhydrous lithium chloride according to claim 1, characterized in that: the concentration of the lithium chloride crystal slurry in the step A is 10-40%, and after centrifugal separation, the humidity of the lithium chloride solid is less than or equal to 3%.
3. A method of drying anhydrous lithium chloride according to claim 1, characterized in that: the air volume of the fresh air in the step B is 5000-.
4. A method of drying anhydrous lithium chloride according to claim 1, characterized in that: and C, the air volume of the fresh air in the step C is 2000-4000m3/h, and the air pressure is 6000-9000PaG, the temperature is reduced to 10-15 ℃, and meanwhile, the humidity RH is not higher than 10%.
5. A method of drying anhydrous lithium chloride according to claim 1, characterized in that: and D, the thickness of the material layer in the normal fluidization state in the step D is 15-30cm, and the fluidization speed is 0.6-1.2 m/s.
6. A method of drying anhydrous lithium chloride according to claim 1, characterized in that: and E, fluidizing the material in the fluidized bed for 20-45 minutes, and discharging the material out of the fluidized bed at the temperature of below 65 ℃ after cooling.
7. A method of drying anhydrous lithium chloride according to claim 1, characterized in that: the dust content of the tertiary dust-containing gas discharged from the step G is less than or equal to 10mg/m 3 。
8. A method of drying anhydrous lithium chloride according to claim 1, characterized in that: the weight of the solid material packaged in the step I is 15-1000 Kg.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103007819A (en) * | 2012-12-17 | 2013-04-03 | 山东奥诺能源科技有限公司 | Fluidized bed low-temperature granulation drying production system |
| CN204830768U (en) * | 2015-06-03 | 2015-12-02 | 清远市新绿环境技术有限公司 | Drying device of alkali formula copper chloride |
| CN206176896U (en) * | 2016-11-07 | 2017-05-17 | 衡水捷信机械科技有限公司 | Ammonium persulfate fluidized bed dryer |
| CN109442870A (en) * | 2018-10-25 | 2019-03-08 | 江西赣锋锂业股份有限公司 | A kind of method of dry monohydrate lithium hydroxide |
| CN111545466A (en) * | 2020-05-12 | 2020-08-18 | 南县三缘米业有限公司 | Energy-concerving and environment-protective type rice processing equipment |
| CN112403246A (en) * | 2020-12-16 | 2021-02-26 | 北京国电龙源环保工程有限公司 | Efficient ammonia desulphurization and dust removal device and application method thereof |
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| CN103007819A (en) * | 2012-12-17 | 2013-04-03 | 山东奥诺能源科技有限公司 | Fluidized bed low-temperature granulation drying production system |
| CN204830768U (en) * | 2015-06-03 | 2015-12-02 | 清远市新绿环境技术有限公司 | Drying device of alkali formula copper chloride |
| CN206176896U (en) * | 2016-11-07 | 2017-05-17 | 衡水捷信机械科技有限公司 | Ammonium persulfate fluidized bed dryer |
| CN109442870A (en) * | 2018-10-25 | 2019-03-08 | 江西赣锋锂业股份有限公司 | A kind of method of dry monohydrate lithium hydroxide |
| CN111545466A (en) * | 2020-05-12 | 2020-08-18 | 南县三缘米业有限公司 | Energy-concerving and environment-protective type rice processing equipment |
| CN112403246A (en) * | 2020-12-16 | 2021-02-26 | 北京国电龙源环保工程有限公司 | Efficient ammonia desulphurization and dust removal device and application method thereof |
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