Inorganic oxide molding and drying integrated apparatus and method for preparing inorganic oxide spherical particles

Abstract

The present disclosure relates to an inorganic oxide forming and drying integrated device and a preparation method of inorganic oxide spherical particles, the integrated device comprising a forming device, a conveying device, a drying device and a discharge box; the forming device comprising a balling column, a water tank and an ammonia water preparation system; the conveying device comprising a conveying mesh belt; the water tank connecting the forming device and one end of the drying device into an integrated whole; the other end of the drying device being connected to the discharge box into an integrated whole; the conveying mesh belt running between the water tank, the drying device and the discharge box and forming a closed loop; the drying device comprising a heating unit and drying boxes; the drying boxes in the middle of the drying device being provided with a moisture discharge port and an exhaust fan; a transfer fan being arranged between adjacent drying boxes, and the tail gas of the drying device being discharged through the moisture discharge port and the exhaust fan; a heat preservation partition being arranged in the drying device, and a cooling channel being arranged below the heat preservation partition. The integrated device has a compact structure, and the drying boxes have no harmful waste gas escaping, and are green and environmentally friendly.

Description

Technical Field

[0001] The present application relates to the field of catalyst production, and specifically to an integrated device for forming and drying inorganic oxides and a method for preparing spherical inorganic oxide particles. Background Art

[0002] Inorganic oxide pellets, such as silica-alumina pellets and alumina pellets, produced using the oil-ammonia column molding method exhibit uniform structure, high strength, and low wear. They are widely used as catalyst supports and adsorbents in fixed and moving bed reactors. The oil-ammonia column molding method involves dripping an inorganic oxide sol from a dripping tray into a molding column filled with kerosene and aqueous ammonia. The sol droplets first shrink into spheres in the kerosene layer, then cross the oil-ammonia interface and enter the aqueous ammonia layer. The sol spheres quickly gel in the aqueous ammonia layer. After separation from the aqueous ammonia, the gelled spheres are dried and calcined under specific conditions to yield the inorganic oxide pellets.

[0003] A mesh belt conveyor can be used to remove the gel balls from the ammonia solution. The bottom of the ball column is connected to an inclined water trough. A mesh belt extends along the trough to the bottom of the column, catching the falling gel balls and lifting them diagonally upward along the trough, finally separating the gel balls from the ammonia solution. This mesh belt conveyor offers smooth operation, but the equipment design and installation are complex.

[0004] Chinese patent document CN2346499Y discloses a spherical catalyst forming device consisting of a forming and curing column, an aging conveyor, and a draining channel. The aging conveyor continuously and evenly transports the balls while meeting aging requirements. The draining channel removes the curing liquid from the ball surface and between the ball particles for recycling. Due to the low strength of gel balls, direct discharge would cause significant damage to them.

[0005] Chinese patent document CN110560176A discloses a catalyst carrier pelletizing and drying method and the equipment used therein. The method comprises the following process steps: forming → curing → drying → discharging. The equipment comprises a forming device, a curing device, and a drying device. The forming device includes a pelletizing tray and a pelletizing column located below it. The curing device comprises a water trough connected to the bottom of the pelletizing column, within which a first conveyor mesh belt is located. The drying device comprises several drying boxes and a discharge box, each equipped with a circulating fan, a heater, and a second conveyor mesh belt. This patent integrates the pelletizing, conveying, and drying processes, simplifying operation and improving production efficiency. However, the conveyor mesh belts are all located in the heating zone, and the hot mesh belts directly enter the water trough, continuously heating the pelletizing medium and increasing ammonia volatilization. Each drying box is equipped with a dehumidification port and a fresh air inlet. The excessive number of dehumidification ports and fresh air inlets, as well as pressure fluctuations within the drying device, can cause waste gas to escape from the fresh air inlet, polluting the environment.

[0006] US Patent Document USP2450394 discloses a method for preparing spherical catalysts. The main features of this process are: (1) A specially constructed ball-forming box is filled with oil in the space marked 16. The oil may contain an appropriate amount of organic base, and the sol droplets are initially solidified in the oil to prevent damage when crossing the oil-water interface. (2) The needle of the ball dropper 15 is buried in the oil to prevent the droplets from colliding with the oil surface and breaking. (3) The conveyor 23 penetrates into the bottom of the forming box, and the gel wet balls continuously fall into the hopper on the conveyor and are lifted out of the ball-forming box. The lifting mesh belt and the drying device mesh belt of this patent are independent of each other, and the intermediate transportation process may cause damage to the gel balls. Summary of the Invention

[0007] The purpose of the present disclosure is to provide a method for forming and drying inorganic oxides.

[0008] To achieve the above-mentioned objectives, the first aspect of the present disclosure provides an integrated device for forming and drying inorganic oxides, the integrated device comprising a forming device, a conveying device, a drying device and a discharge box; the forming device comprises a spherical column, a water tank and an ammonia water production system; the conveying device comprises a conveying mesh belt; the water tank connects the forming device and one end of the drying device into one piece through a flange; the other end of the drying device is connected to the discharge box as one piece; the conveying mesh belt runs between the water tank, the drying device and the discharge box to form a closed loop; the ammonia water production system dissolves liquid ammonia in ammonia water and maintains the ammonia water concentration in the spherical column; the drying device comprises a heating unit and a plurality of drying boxes; the drying box in the middle of the drying device is provided with a dehumidification port and an exhaust fan; a transfer fan is provided between adjacent drying boxes, and the exhaust gas of the drying device is discharged through the dehumidification port and the exhaust fan; an insulation partition is provided in the drying device, and a cooling channel is provided below the insulation partition, the upward section of the conveying mesh belt is located above the insulation partition, and the downward section of the conveying mesh belt is located in the cooling channel.

[0009] Optionally, the water trough is provided with a horizontally arranged feeding section and an obliquely arranged conveying section, the conveying section is inclined at an angle of 10 to 50 degrees to the horizontal line, and the high end of the conveying section is connected to the drying box through the flange.

[0010] Optionally, the conveying device also includes a transmission chain, a transmission sprocket and a transmission motor reducer; the conveying mesh belt is fixed on the surface of the transmission chain, the transmission chain is arranged on the surface of the transmission sprocket, and the transmission sprocket is driven by the transmission motor reducer and rolls on the raceway.

[0011] Optionally, the conveyor mesh belt is a stainless steel woven herringbone folded edge mesh belt; a plurality of transverse baffles are provided on the conveyor mesh belt, and the spacing between the transverse baffles is 30 to 200 mm.

[0012] Optionally, an insulating partition is provided in the drying device, a cooling channel is provided below the insulating partition, and the cooling channel has a detachable bottom plate; the upward section of the conveyor mesh belt is located above the insulating partition of the drying box, and the upward section of the conveyor mesh belt is located in the cooling channel.

[0013] Optionally, the ratio of the air volume of the transfer fan to the air volume of the exhaust fan is 0.1 to 0.5.

[0014] The second aspect of the present disclosure provides a method for preparing spherical inorganic oxide particles, which is used in an integrated inorganic oxide forming and drying device. The preparation method includes the following steps: the inorganic oxide slurry falls into the forming device in the form of droplets to form gel balls; the gel balls are conveyed by the conveying device into the drying device for drying to obtain dried inorganic oxide pellets.

[0015] Optionally, a solvent oil layer is provided on the surface of the ammonia water in the forming device; the inorganic oxide slurry falls into the solvent oil layer in the form of droplets to obtain spherical droplets; the spherical droplets fall into the ammonia water to form gel balls.

[0016] Optionally, the concentration of the ammonia water is 2% to 8%, preferably 4% to 7%; the thickness of the solvent oil layer is 10 to 500 mm, preferably 20 to 200 mm; the solvent oil is selected from at least one of kerosene, petroleum ether, white oil and dodecane, preferably kerosene.

[0017] Optionally, the running speed of the conveyor belt is 1 to 30 m / h, preferably 3 to 15 m / h; the drying temperature in the drying oven is 60 to 150°C, preferably 90 to 120°C.

[0018] Through the above technical scheme, the preparation method of inorganic oxide spherical particles disclosed in the present invention can ensure stable production and reduce ammonia consumption; the inorganic oxide forming and drying integrated equipment adopted in the present invention has a compact structure, fresh air is added at both ends of the drying device, and no harmful exhaust gas escapes from the drying box, which is green and environmentally friendly.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0021] Figure 1 It is a structural schematic diagram of the inorganic oxide forming and drying integrated equipment disclosed in the present invention.

[0022] Figure 2 It is a partial cross-sectional view of the drying box in the present disclosure.

[0023] Description of Reference Numerals

[0024] 1 ball column 2 sink

[0025] 3 conveyor belt 4 drying oven

[0026] 5 discharge box 6 exhaust fan

[0027] 7 transmission motor reducer 8 transmission sprocket

[0028] 9 guide rails 10 ammonia production system

[0029] 11 Exhaust fan 12 Heater

[0030] 13 transfer fan 14 insulation partition

[0031] 15 removable bottom plate DETAILED DESCRIPTION

[0032] The following describes the specific embodiments of the present disclosure in detail. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0033] The first aspect of the present disclosure provides an integrated device for forming and drying inorganic oxides, the integrated device comprising a forming device, a conveying device, a drying device and a discharge box; the forming device comprises a spherical column, a water tank and an ammonia water production system; the conveying device comprises a conveying mesh belt; the water tank connects the forming device and one end of the drying device into one piece through a flange; the other end of the drying device is connected to the discharge box as one piece; the conveying mesh belt runs between the water tank, the drying device and the discharge box to form a closed loop; the ammonia water production system dissolves liquid ammonia in ammonia water and maintains the ammonia water concentration in the spherical column; the drying device comprises a heating unit and a plurality of drying boxes; the drying box in the middle of the drying device is provided with a dehumidification port and an exhaust fan; a transfer fan is provided between adjacent drying boxes, and the exhaust gas of the drying device is discharged through the dehumidification port and the exhaust fan; an insulation partition is provided in the drying device, and a cooling channel is provided below the insulation partition, the upward section of the conveying mesh belt is located above the insulation partition, and the downward section of the conveying mesh belt is located in the cooling channel.

[0034] When using the device disclosed herein, ammonia water is first injected to a set liquid level, followed by solvent oil. The inorganic oxide slurry then drips through a dripper into the ball-forming column below. Within the column, the droplets sequentially pass through the kerosene layer and the ammonia water layer, completing their formation and solidification, before falling onto the mesh belt below. The forming process consumes a large amount of ammonia. To maintain the ammonia concentration in the ammonia water layer, an ammonia water production system is established. Ammonia water is circulated between the forming column and the ammonia water production system, dissolving the liquid ammonia in the forming ammonia water through the ammonia water production system. A conveyor mesh belt slowly moves, pulled by a sprocket. Below the ball-forming column, the gel balls are caught, lifted above the liquid surface, and transported to a drying device. After drying, the inorganic oxide material is discharged from a discharge bin. The conveyor mesh belt returns to the forming device through the cooling channel below the drying oven. The mesh belt enters a water tank and descends below the ball-forming column, thus forming a closed conveying loop. Within the drying unit, hot air penetrates the mesh belt and material layers to exchange heat and mass with the material. The degree of drying and aging is controlled by independently adjusting the hot air temperature in each drying unit. Moisture evaporated from the material during the drying process enters the hot air and is discharged through the moisture outlet of the intermediate drying box via an exhaust fan to the exhaust gas treatment system. A transfer fan is installed between adjacent drying boxes to ensure fresh air is supplied from both ends of the drying unit, preventing ammonia-containing exhaust gases from escaping the drying unit.

[0035] According to the present disclosure, the water trough can be provided with a horizontally arranged feeding section and an obliquely arranged conveying section, the conveying section can be inclined at an angle of 10 to 50 degrees to the horizontal line, and the high end of the conveying section can be connected to the drying box through the flange.

[0036] In a preferred embodiment of the present disclosure, the conveying device may further include a transmission chain, a transmission sprocket and a transmission motor reducer; the conveying mesh belt is fixed on the surface of the transmission chain, the transmission chain is arranged on the surface of the transmission sprocket, and the transmission sprocket is driven by the transmission motor reducer and rolls on the raceway.

[0037] According to the present disclosure, the conveyor mesh belt can be a stainless steel woven herringbone hemmed mesh belt. Several cross baffles can be provided on the conveyor mesh belt to prevent the inorganic oxide pellets from rolling off during the lifting process. The cross baffles have a hemming height of 20 to 60 mm, a cross baffle height of 20 to 60 mm, and a cross baffle spacing of 30 to 200 mm, preferably 40 to 100 mm.

[0038] In a preferred embodiment of the present disclosure, the cooling channel has a detachable bottom plate. To enhance the cooling of the conveyor belt, air cooling can be provided to keep the conveyor belt at a temperature of 5 to 40°C before entering the forming device to prevent excessive heating of the ammonia solution and the resulting volatilization of ammonia gas.

[0039] According to the present disclosure, the ratio of the air volume of the delivery fan to the air volume of the exhaust fan may be 0.1 to 0.5.

[0040] A specific embodiment of the present disclosure is as follows Figure 1 and Figure 2 As shown, an integrated inorganic oxide forming and drying apparatus comprises a forming device, a drying device, and a conveying device. The forming device includes a ball-forming column 1, a water tank 2, and an ammonia production system 10. The drying device comprises several drying boxes 4, each equipped with a circulating fan 11 and a heater 12. The conveying device comprises a conveyor mesh belt 3, a conveyor chain, a drive motor reducer 7, a drive sprocket 8, and a guide rail 9. The ball-forming column 1 is a rectangular parallelepiped structure, 1 to 3 meters high. The top of the ball-forming column 1 is connected to the ammonia production system 10 via a pipeline. In the ammonia production system 10, liquid ammonia is dissolved in ammonia water, which is then pumped to the bottom of the water tank 3. The water tank, connecting the bottom of the ball-forming column and the drying device, has a horizontally arranged material receiving section and an upwardly inclined lifting section. The water tank is connected to the ball-forming column and drying boxes via flanges. The conveyor mesh belt 3 is installed in the water tank 2.

[0041] A specific embodiment of the present disclosure is as follows Figure 1 and Figure 2 As shown, the drying box 4 is a rectangular box-type structure with insulation, which adopts convection heat transfer and the circulating air duct is a single-sided side wall type. Each drying unit has an independent circulating fan 11, heater 12, temperature detection element, and maintenance door. The circulating fan 11 is a centrifugal fan, and the heater 12 is a heater, which can be an electric heater or a steam heater. Temperature measuring elements are set above and below the material layer of each box body, and the temperature measuring point in the upstream direction of the hot air is used as the monitoring point. Only the middle 1 to 3 drying boxes are provided with dehumidification ports, which are connected to the dehumidification fan 6 after being collected, and the remaining drying boxes are not provided with dehumidification ports. Each drying box is not provided with a fresh air inlet. A transfer fan 13 is set between two adjacent drying boxes, and the air supply direction is from both ends to the middle, ensuring that fresh air is replenished from both ends of the drying device to prevent ammonia from escaping the drying device. In the present disclosure, in the drying device area, an insulating partition 14 is set between the upper and lower layers of mesh belts. The upper mesh belt is located in the drying oven's heating zone, while the lower mesh belt is located in a cooling channel outside the drying oven. This cooling channel features a removable bottom plate 15. When exhaust fan 6 is not operating, bottom plate 15 is installed to isolate the cooling channel from the surrounding environment and prevent ammonia from escaping. When exhaust fan 6 is operating, the device is under a slight negative pressure. By removing bottom plate 15 and adding a forced cooling fan, the return mesh belt is cooled to a temperature of 5-40°C, preferably 15-35°C. After cooling, the return mesh belt returns to water tank 2.

[0042] A specific embodiment of the present disclosure is as follows Figure 1As shown, the conveyor device includes a conveyor mesh belt 3, a conveyor chain, a drive sprocket 8, a drive motor reducer 7, and a roller conveyor. The mesh belt 3 is fixed to the conveyor chain, which is mounted on the drive sprocket 8. The drive motor reducer 7 drives the drive sprocket 8 to rotate. The chain moves on the roller conveyor, and guide rails 9 are installed at the bends of the roller conveyor. The conveyor mesh belt 3 forms a closed-loop conveyor mesh belt within the water tank 2 and drying box 4. The closed-loop conveyor mesh belt is powered by a transmission system.

[0043] The second aspect of the present disclosure provides a method for preparing spherical inorganic oxide particles, which is used in an integrated inorganic oxide forming and drying device. The preparation method includes the following steps: the inorganic oxide slurry falls into the forming device in the form of droplets to form gel balls; the gel balls are conveyed by the conveying device into the drying device for drying to obtain dried inorganic oxide pellets.

[0044] According to the present disclosure, a solvent oil layer may be provided on the surface of the ammonia water in the molding device; the inorganic oxide slurry falls into the solvent oil layer in the form of droplets to obtain spherical droplets; the spherical droplets fall into the ammonia water to form gel balls.

[0045] According to the present disclosure, the concentration of the ammonia water can be 2% to 8%, preferably 4% to 7%; the thickness of the solvent oil layer can be 10 to 500 mm, preferably 20 to 200 mm; the solvent oil is selected from at least one of kerosene, petroleum ether, white oil and dodecane, preferably kerosene.

[0046] According to the present disclosure, the gel balls can be dried using hot air. The conveyor belt can run at a speed of 1 to 30 m / h, preferably 3 to 15 m / h. The drying temperature in the drying oven can be 60 to 150°C, preferably 90 to 120°C. The dried inorganic oxide balls are discharged and collected in a discharge box.

[0047] In a specific embodiment of the present disclosure, ammonia water is injected into the container formed by the spheroidizing column 1 and the water tank 2. When the ammonia water reaches the set liquid level, kerosene is then injected into the spheroidizing column to the set liquid level. The inorganic oxide slurry falls into the kerosene layer of the spheroidizing column in the form of droplets through the dripper. The droplets form spheres in the kerosene, pass through the kerosene layer, fall into the ammonia water, solidify in the ammonia water to form gel balls, and the gel balls fall onto the conveyor mesh 3. The conveyor mesh 3 lifts the catalyst pellets out of the liquid surface. The conveyor mesh 3 continues to move forward and enters the drying box 4. In the drying box 4, the gel balls are dried by hot air. The dried inorganic oxide pellets are discharged and collected in the discharge box 5. Liquid ammonia is dissolved in ammonia water by the ammonia water production system 10 to supplement the ammonia consumed by the molding device and maintain the ammonia content of the ammonia water in the spheroidizing column 1 stable.

[0048] The present disclosure is further described in detail below through examples. The raw materials used in the examples can be obtained through commercial channels.

[0049] Example 1

[0050] The inorganic oxide forming and drying integrated equipment provided by the present disclosure is used to prepare alumina pellet carriers.

[0051] The ball-forming column (1) is a rectangular parallelepiped structure, 2 meters high. The water tank (2) is a flat rectangular structure. The material receiving section of the water tank is horizontal and flange-connected to the lower end of the ball-forming column. The water tank's lifting section is inclined at 30 degrees from the horizontal, and the upper end of the lifting section is connected to the drying device via a flange. 7% ammonia water is injected into the container formed by the ball-forming column (1) and water tank (2) until the liquid reaches the set level. Then, kerosene is injected into the ball-forming column to a thickness of 300 mm.

[0052] An inorganic alumina slurry was prepared using SASOL SB powder, deionized water, reagent nitric acid, and urea in a mass ratio of 100:250:6:20. This inorganic alumina slurry was then dripped into the kerosene column at a rate of 350 kg / h through a dripper. The droplets formed spherical shapes in the kerosene, passed through the kerosene layer, and fell into the ammonia solution, where they solidified into gel spheres. The gel spheres then fell onto a conveyor belt 3 below the column. The conveyor belt 3 moved at a speed of 8 m / h, lifting the catalyst pellets out of the liquid.

[0053] The top of the spherical column 1 is connected to an ammonia production system 10 via a pipeline. In this system 10, liquid ammonia is dissolved in ammonia water to replenish ammonia consumed by the forming unit, maintaining the ammonia content of the ammonia water in the spherical column 1 at 4% to 7%. The liquid ammonia consumption is 11.8 kg / h.

[0054] The conveyor belt 3 continues forward and enters the drying unit, which consists of 16 2m-long drying ovens 4. Within each drying oven 4, the gel balls are dried using hot air, with the outlet temperature of the heating unit set to 120°C. The material is dried for 4 hours. Exhaust gas is extracted from the dehumidification ports at the top of the 8th and 9th drying ovens and fed into exhaust fan 6. Except for drying ovens 8 and 9, transfer fans 13 are installed between adjacent drying ovens, transferring air from the 1st drying oven to the 8th drying oven, and from the 16th drying oven to the 9th drying oven.

[0055] In the drying device area, an insulation partition 14 is set between the upper and lower mesh belts. The upper mesh belt is in the heating box, and the lower mesh belt is in the cooling channel. Remove the bottom plate 15 under the cooling channel and run the exhaust fan 6 with an exhaust volume of 5000m 3 / h, the air volume of the transfer fan 13 is 2000m 3 / h. The drying device is operated at a slight negative pressure at both ends, and the fan is running to cool the mesh belt. When the ambient temperature is 20°C, the mesh belt temperature is between 25°C and 30°C before entering water tank 2. Fresh air inlets are located at both ends of the cooling channel, and the ammonia content is detected to be 0 ppm.

[0056] The dried alumina pellets are discharged from the discharge box 5, and the dried alumina pellets are calcined at 600° C. to obtain activated alumina pellets with a bulk density of 0.74 g / mL and a crushing strength of 160 N / pellet.

[0057] The inorganic oxide forming and drying integrated equipment provided by the present disclosure is used to prepare alumina pellet carriers, and the three processes of forming, conveying and drying are operated smoothly.

[0058] Example 2

[0059] Inorganic oxide pellet carriers were prepared using the method and equipment described in Example 1, except that the inorganic oxide was alumina pellets containing ZSM-5. The molar ratio of silicon oxide to aluminum oxide in the ZSM-5 powder was 60. A ZSM-5-containing alumina slurry was prepared using HV-D-03 powder from Qingdao Shanke Haitai Co., Ltd., deionized water, reagent nitric acid, and ZSM-5 powder in a mass ratio of 50:220:6:40.

[0060] The dried alumina pellets are discharged from the discharge box 5, and the obtained dried alumina pellets are then calcined at 600°C to obtain activated ZSM-5-containing alumina pellets with a bulk density of 0.70 g / mL and a crushing strength of 70 N / pellet.

[0061] The inorganic oxide forming and drying integrated equipment provided by the present disclosure is used to prepare alumina pellet carriers containing ZSM-5, and the three processes of forming, conveying and drying are operated smoothly.

[0062] Comparative Example 1

[0063] Alumina pellet carriers were prepared according to the method described in Example 1, except that no insulation partition was placed between the upper and lower mesh belts in the drying area; both mesh belts were located entirely within the drying oven's heating zone. At an ambient temperature of 20°C, the mesh belts maintained a temperature of 50-60°C upon returning to the water tank 2. The ammonia production system 10 consumed 20.2 kg / h of liquid ammonia.

[0064] The dried alumina pellets are discharged from the discharge box 5, and the obtained dried alumina pellets are then calcined at 600° C. to obtain activated alumina pellets with a bulk density of 0.74 g / mL and a crushing strength of 158 N / pellet.

[0065] Comparative Example 2

[0066] Alumina pellet carriers were prepared according to the method described in Example 1, except that the drying apparatus was not equipped with a transfer fan. Instead, a fresh air inlet and a dehumidification outlet were provided in each drying box, and the dehumidification outlets were connected to dehumidification fan 6. Ammonia was detected at the fresh air inlet, with a content of 5 to 30 ppm.

[0067] The dried alumina pellets are discharged from the discharge box 5, and the dried alumina pellets are calcined at 600° C. to obtain activated alumina pellets with a bulk density of 0.74 g / mL and a crushing strength of 155 N / pellet.

[0068] The preferred embodiments of the present disclosure are described in detail above. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0070] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An inorganic oxide forming and drying integrated equipment, characterized in that: The integrated equipment includes a forming device, a conveying device, a drying device and a discharge box; the forming device includes a ball forming column, a water tank and an ammonia water production system; the conveying device includes a conveying mesh belt; The water trough integrally connects the forming device and one end of the drying device through a flange; the other end of the drying device is integrally connected to the discharge box; the conveyor mesh belt runs between the water trough, the drying device and the discharge box to form a closed loop; The ammonia water production system dissolves liquid ammonia in ammonia water and maintains the ammonia water concentration in the spheroidizing column; The drying device includes a heating unit and several drying boxes; the drying box in the middle of the drying device is provided with a dehumidification port and an exhaust fan, which is used to discharge the exhaust gas of the drying device through the dehumidification port and the exhaust fan; an insulation partition is provided between the upward section of the conveyor mesh belt and the downward section of the conveyor mesh belt, and a cooling channel is provided outside and below the drying box, the upward section of the conveyor mesh belt is located inside the drying box, and the downward section of the conveyor mesh belt is located in the cooling channel; the cooling channel has a detachable bottom plate, and both ends of the cooling channel are fresh air inlets for the drying device; a transfer fan is provided between adjacent drying boxes, which is used to transfer fresh air from both ends of the drying device to the drying box in the middle of the drying device, and the ratio of the air volume of the transfer fan to the air volume of the exhaust fan is 0.1~0.5; when the exhaust fan is stopped, the bottom plate is installed to isolate the cooling channel from the environment; when the exhaust fan is running, the bottom plate is removed.

2. The integrated device according to claim 1, wherein: The water trough is provided with a horizontally arranged feeding section and an obliquely arranged conveying section, the conveying section is inclined at an angle of 10 to 50 degrees to the horizontal line, and the high end of the conveying section is connected to the drying box through the flange.

3. The integrated device according to claim 1, wherein: The conveying device also includes a transmission chain, a transmission sprocket and a transmission motor reducer; The conveyor mesh belt is fixed on the surface of the transmission chain, the transmission chain is arranged on the surface of the transmission sprocket, and the transmission sprocket is driven by the transmission motor reducer and rolls on the roller track.

4. The integrated device according to claim 1 or 3, wherein: The conveyor mesh belt is a stainless steel woven herringbone folded edge mesh belt; a plurality of transverse baffles are arranged on the conveyor mesh belt, and the spacing between the transverse baffles is 30-200 mm.

5. A method for preparing spherical inorganic oxide particles, characterized in that: The inorganic oxide forming and drying integrated equipment according to any one of claims 1 to 4, wherein the preparation method comprises the following steps: The inorganic oxide slurry falls into the forming device in the form of droplets to form gel balls; The gel balls are transported from the conveying device to the drying device for drying to obtain dried inorganic oxide balls.

6. The preparation method according to claim 5, wherein A solvent oil layer is provided on the surface of the ammonia water in the forming device; the inorganic oxide slurry falls into the solvent oil layer in the form of droplets to obtain spherical droplets; the spherical droplets fall into the ammonia water to form gel balls.

7. The preparation method according to claim 6, wherein The concentration of the ammonia water is 2% to 8%; the thickness of the solvent oil layer is 10 to 500 mm; and the solvent oil is selected from at least one of kerosene, petroleum ether, white oil and dodecane.

8. The preparation method according to claim 7, wherein The concentration of the ammonia water is 4% to 7%; the thickness of the solvent oil layer is 20 to 200 mm; and the solvent oil is kerosene.

9. The preparation method according to claim 5, wherein The running speed of the conveyor mesh belt is 1-30 m / h; the drying temperature in the drying box is 60-150°C.

10. The preparation method according to claim 9, wherein The running speed of the conveyor mesh belt is 3-15 m / h; the drying temperature in the drying box is 90-120°C.

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