Tail powder recovery system

Abstract

The utility model discloses a tail powder recovery system which comprises a spray drying tower, a tail powder recovery device and a tail powder recovery device. The first tail powder recovery device is used for recovering first tail powder generated by the spray drying tower, and an outlet of the first tail powder recovery device is communicated with the material inlet; the second tail powder recovery device communicates with an external powder conveying system and is used for recovering second tail powder generated by the powder conveying system, and an outlet of the second tail powder recovery device communicates with the material inlet; and the high-pressure gas conveying device is used for applying pressure to the first tail powder recovery device and the second tail powder recovery device respectively, so that the first tail powder and the second tail powder flow into the spray drying tower. According to the tail powder recovery system, the collected tail powder can be directly conveyed into the spray drying tower and combined with slurry sprayed in the tower to be subjected to agglomeration and re-granulation, traditional complex processes such as slurrying, pumping and ball milling are avoided, energy is saved, and cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of spray drying technology, and in particular to a tail powder recovery system. Background Technology

[0002] A spray drying tower is a device used in ceramic production to prepare ceramic powder. Slurry droplets sprayed from nozzles are dehydrated by hot air, drying to form ceramic powder particles containing a certain amount of moisture and particle size. During spray drying, the raw material slurry is atomized by an atomizer, comes into contact with hot air, and rapidly evaporates moisture to form dry powder. Most of the dry powder flows out from the bottom cone of the drying tower for collection, but a small portion of tiny particles are carried out of the drying tower by the airflow from the induced draft fan.

[0003] In existing technologies, dust collectors are used to recover this part of the tailings powder. However, the particle size of the tailings powder does not meet the particle size distribution requirements of the press and cannot be used directly. Therefore, these tailings powders usually need to go through complex processes such as slurrying, pumping, and ball milling before they can be re-entered into the spray drying tower for re-drying, which leads to increased production costs and energy waste. Utility Model Content

[0004] To address at least one problem existing in the prior art, according to one aspect of the present invention, a tailings powder recovery system is provided, comprising:

[0005] A spray drying tower, wherein the spray drying tower has a tail powder outlet and a material inlet;

[0006] The first tail powder recovery device is connected to the tail powder outlet and is used to recover the first tail powder generated by the spray drying tower. The outlet of the first tail powder recovery device is connected to the material inlet.

[0007] The second tail powder recovery device is connected to an external powder conveying system and is used to recover the second tail powder generated by the powder conveying system. The outlet of the second tail powder recovery device is connected to the material inlet.

[0008] A high-pressure gas conveying device is connected to the first tail powder recovery device and the second tail powder recovery device respectively, and is used to apply pressure to the first tail powder recovery device and the second tail powder recovery device respectively, so that the first tail powder and the second tail powder flow into the spray drying tower.

[0009] In some embodiments, the first tail powder recovery device includes an outlet pipe, a first negative pressure machine, a first dust collector, a first sending chamber, and a first conveying pipe. The outlet pipe is connected between the tail powder outlet and the first dust collector. The first negative pressure machine is connected to the first dust collector. The first sending chamber is located at the outlet of the first dust collector. The first conveying pipe is connected between the outlet of the first sending chamber and the material inlet.

[0010] In some embodiments, the first tail powder recovery device further includes a first feed valve and a first discharge valve, wherein the first feed valve is located at the inlet of the first sending chamber and the first discharge valve is located at the outlet of the first sending chamber.

[0011] In some embodiments, the first tail powder recovery device includes a collection hopper and a plurality of the first dust collectors, the collection hopper being located at the outlet of the plurality of the first dust collectors and at the inlet of the first sending bin.

[0012] In some embodiments, the second tail powder recovery device includes a second negative pressure machine, a second dust collector, a second sending chamber, and a second conveying pipeline. The second dust collector is used to connect to an external powder conveying system. The second negative pressure machine and the second dust collector are connected. The second sending chamber is located at the outlet of the second dust collector. The second conveying pipeline is connected to the outlet of the second sending chamber and the material inlet.

[0013] In some embodiments, the second tail powder recovery device further includes a second feed valve and a second discharge valve, the second feed valve being located at the inlet of the second sending chamber and the second discharge valve being located at the outlet of the second sending chamber.

[0014] In some embodiments, the second tailings recovery device further includes a horizontally arranged conveying mechanism located at the outlet of the second dust collector and connected to the inlet of the second sending chamber.

[0015] In some embodiments, the high-pressure gas conveying device includes at least a gas storage tank, a first gas supply pipeline, and a second gas supply pipeline. The first gas supply pipeline is connected to the gas storage tank and the first tail powder recovery device, respectively, and the second gas supply pipeline is connected to the gas storage tank and the second tail powder recovery device, respectively.

[0016] In some embodiments, the high-pressure gas conveying device further includes a first fluidizing conduit and a second fluidizing conduit;

[0017] The first fluidizing pipe is connected between the first gas supply pipe and the first tail powder recovery device, and the outlet of the first fluidizing pipe is located below the outlet of the first gas supply pipe.

[0018] The second fluidizing pipe is connected between the second gas supply pipe and the second tail powder recovery device, and the outlet of the second fluidizing pipe is located below the outlet of the second gas supply pipe.

[0019] In some embodiments, the high-pressure gas delivery device further includes at least two first control valves and at least two second control valves;

[0020] The first fluidizing pipe and the first gas supply pipe are each equipped with the first control valve, and each of the first control valves is used to control the on / off of the gas supply to the first fluidizing pipe and the first gas supply pipe, respectively.

[0021] The second fluidizing pipe and the second gas supply pipe are each equipped with a second control valve, and each second control valve is used to control the on / off of the gas supply to the second fluidizing pipe and the second gas supply pipe, respectively.

[0022] In summary, the tailings recovery system provided by this utility model has the following technical effects:

[0023] By setting up a first tail powder recovery device and a second tail powder recovery device, the tail powder from the spray drying tower and other powder conveying systems are recovered respectively. The collected tail powder is driven by high-pressure gas from the high-pressure gas conveying device and directly enters the spray drying tower through the material inlet. It combines with the slurry sprayed from the spray drying tower and then agglomerates and is re-granulated. After contacting the hot air flowing in from the air inlet and readjusting the moisture content, qualified granular finished products are obtained. This avoids the traditional complex processes such as slurrying, pumping, and ball milling, saving energy and reducing costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the tail powder recovery system according to an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 Enlarged schematic diagram of point I in the middle;

[0026] Figure 3 for Figure 1 Enlarged schematic diagram at point II;

[0027] Figure 4 for Figure 3 Enlarged schematic diagram at point IV;

[0028] Figure 5 for Figure 1 Enlarged schematic diagram at point III;

[0029] Figure 6 for Figure 5 Enlarged diagram of section V.

[0030] Attached Figures: 100-Tail Powder Recovery System, 10-Spray Drying Tower, 11-Tail Powder Outlet, 12-Material Inlet, 13-Slurry Spraying Device, 14-Air Inlet, 15-First Discharge Outlet, 20-First Tail Powder Recovery Device, 21-Outlet Pipe, 22-First Negative Pressure Unit, 23-First Dust Collector, 231-Second Discharge Outlet, 24-First Sending Bin, 241-First Arc-Shaped Connecting Section, 242-First Horizontal Diameter Section, 243-First Diameter Reduction Section, 25-First Conveying Pipeline, 26-First Feed Valve, 27-First Discharge Valve, 28-Collection Hopper, 29-Connecting Pipeline, 30- Second tail powder recovery device, 31-Second negative pressure machine, 32-Second dust collector, 321-Suction port, 322-Third discharge port, 33-Second sending bin, 331-Second arc-shaped docking section, 332-Second transverse diameter section, 333-Second diameter changing section, 34-Second conveying pipe, 35-Conveying mechanism, 36-Second feed valve, 37-Second discharge valve, 40-High pressure gas conveying device, 41-Gas storage tank, 42-First gas supply pipe, 43-Second gas supply pipe, 44-First fluidizing pipe, 45-Second fluidizing pipe, 46-First control valve, 47-Second control valve. Detailed Implementation

[0031] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings.

[0035] Please see Figures 1 to 6 The tail powder recovery system 100 provided in this embodiment of the utility model includes a spray drying tower 10, a first tail powder recovery device 20, a second tail powder recovery device 30, and a high-pressure gas conveying device 40.

[0036] The spray drying tower 10 is used to dry slurry into powder. The spray drying tower 10 has a tail powder outlet 11 and a material inlet 12. The first tail powder recovery device 20 is connected to the tail powder outlet 11 and is used to recover the first tail powder generated by the spray drying tower 10. The outlet of the first tail powder recovery device 20 is connected to the material inlet 12. The second tail powder recovery device 30 is connected to an external powder conveying system and is used to recover the second tail powder generated by the powder conveying system. The outlet of the second tail powder recovery device 30 is connected to the material inlet 12. The high-pressure gas conveying device 40 is connected to the first tail powder recovery device 20 and the second tail powder recovery device 30 respectively and is used to apply pressure to the first tail powder recovery device 20 and the second tail powder recovery device 30 respectively so that the first tail powder and the second tail powder flow into the spray drying tower 10.

[0037] The aforementioned tail powder recovery system 100, by setting up a first tail powder recovery device 20 and a second tail powder recovery device 30, respectively recovers the tail powder from the spray drying tower 10 and the tail powder generated by other powder conveying systems. The collected tail powder is driven by high-pressure gas from the high-pressure gas conveying device 40 and directly enters the spray drying tower 10 through the material inlet 12. It combines with the slurry sprayed from the spray drying tower 10 and then agglomerates, re-granulates, and comes into contact with the hot air flowing in from the air inlet 14. After the moisture content is readjusted, qualified granular finished products are obtained. This avoids the traditional complex processes such as pulping, pumping, and ball milling, saving energy and reducing costs.

[0038] Understandably, please refer to Figure 2 In this embodiment, the spray drying tower 10 is also provided with a slurry spraying device 13 for spraying slurry into the spray drying tower 10. The top of the spray drying tower 10 is also provided with an air inlet 14 for introducing hot air. The high-temperature hot air flows in from the air inlet 14 and mixes with the sprayed slurry. The two exchange heat, and the slurry is dehydrated under the action of the hot air. The slurry is dried quickly to obtain powder with a preset water content, for example, to obtain powder for preparing ceramics. The bottom of the spray drying tower 10 is provided with a first discharge port 15, and the dried powder obtained flows out from the first discharge port 15 at the bottom of the tower.

[0039] During the drying of the slurry in the spray drying tower 10, most of the powder will flow out from the first discharge port 15 at the bottom. However, a small portion of fine powder particles will flow out of the drying tower with the airflow. Please refer to [link / reference needed]. Figures 1 to 3 In this embodiment, the first tail powder recovery device 20 is used to recover the first tail powder in the spray drying tower 10.

[0040] Specifically, in its configuration, the first tail powder recovery device 20 includes an outlet pipe 21, a first negative pressure unit 22, a first dust collector 23, a first sending chamber 24, and a first conveying pipe 25. The outlet pipe 21 connects the tail powder outlet 11 and the first dust collector 23. The first negative pressure unit 22 is connected to the first dust collector 23. The first sending chamber 24 is located at the outlet of the first dust collector 23, i.e., the second discharge port 231. The first conveying pipe 25 connects the outlet of the first sending chamber 24 and the material inlet 12. Thus, in the first negative pressure unit... Under the suction of 22, the airflow carries some powder particles through the outlet pipe 21 to the first dust collector 23. The first dust collector 23 separates the airflow and powder. The separated airflow flows out of the first dust collector 23, and the powder particles flow downward to the first sending chamber 24 by their own gravity. They are collected by the first sending chamber 24 and transported to the material inlet 12 through the first conveying pipe 25. They combine with the slurry sprayed by the slurry spraying device 13 and exchange heat with the hot airflow to obtain powder particles of the required particle size.

[0041] The first dust collector 23 can be a bag filter or a cyclone dust collector, etc., and is not limited thereto. Specifically, in this embodiment, the first dust collector 23 is a cyclone dust collector.

[0042] Furthermore, the first dust collector 23 can be set to one, two, or other quantities to ensure the separation effect of tail powder by setting multiple first dust collectors 23.

[0043] Specifically, this embodiment includes two first dust collectors 23, which improve the filtration efficiency by using multiple first dust collectors 23 arranged in parallel, and effectively separate the particles and airflow carried in the airflow.

[0044] Please refer to Figure 3 and Figure 4 Since the first tail powder recovery device 20 is equipped with multiple first dust collectors 23, in order to facilitate the collection of the first tail powder recovered by the first dust collectors 23 into the first sending chamber 24, the first tail powder recovery device 20 in this embodiment also includes a collection hopper 28. The collection hopper 28 is located at the outlet of the multiple first dust collectors 23 and at the inlet of the first sending chamber 24. In this way, by setting the collection hopper 28, the powder flowing out of the outlet of the multiple first dust collectors 23 can be collected in a concentrated manner and then discharged into the first sending chamber 24, which facilitates the collection of the first tail powder by the first sending chamber 24.

[0045] Understandably, in order to facilitate the concentrated movement of the first tail powder into the first sending chamber 24, the collecting hopper 28 is set in the shape of a funnel, so that the first tail powder can gradually move into the first sending chamber 24 along the inclined wall of the collecting hopper 28 to achieve the effect of collection.

[0046] Furthermore, due to the height of the tail powder outlet 11 of the spray drying tower 10, the first dust collector 23 has a certain setting height. In order to match the height of the second discharge port 231 of the first dust collector 23, a connecting pipe 29 is also provided between the second discharge port 231 of the first dust collector 23 and the collecting hopper 28.

[0047] Furthermore, in this embodiment, the first sending chamber 24 is designed to ensure the carrying capacity of the tail powder while facilitating the output of the tail powder from the first sending chamber 24. The first sending chamber 24 includes a first arc-shaped connecting section 241, a first transverse diameter section 242, and a first variable diameter section 243. The first arc-shaped connecting section 241 has an inlet that connects to the collecting hopper 28. The first variable diameter section 243 has an outlet that connects to the first conveying pipe 25. The inner diameter of the first transverse diameter section 242 remains unchanged, thereby ensuring the carrying capacity of the first sending chamber 24. The inner diameter of the first variable diameter section 243 gradually decreases from the direction away from the transverse diameter section, so that when the particles flow out of the first sending chamber 24, it can have a gathering and guiding effect, and gradually discharge the particles.

[0048] Furthermore, in order to control the flow of the first tail powder from the first dust collector 23 into the first sending chamber 24 and the flow of the first tail powder from the first sending chamber 24, the first tail powder recovery device 20 also includes a first feed valve 26 and a first discharge valve 27. The first feed valve 26 is located at the inlet of the first sending chamber 24, and the first discharge valve 27 is located at the outlet of the first sending chamber 24. By setting the first feed valve 26 and the first discharge valve 27, the inlet and outlet of the first sending chamber 24 can be controlled respectively, thereby controlling the entry of the first tail powder and the output from the first sending chamber 24.

[0049] For example, when feeding is required, the first feed valve 26 is opened and the first discharge valve 27 is closed; after feeding is completed, the first feed valve 26 is closed and the high-pressure gas conveying device 40 is turned on, so that the air pressure in the first sending chamber 24 increases. After reaching a certain air pressure, the first discharge valve 27 is opened, and the powder is conveyed from the first conveying pipe 25 to the spray drying tower 10, where it is dried together with the slurry sprayed by the slurry spraying device 13 to obtain powder.

[0050] Please see Figure 1 , Figure 5 as well as Figure 6In one embodiment of this utility model, the second tail powder recovery device 30 is used to connect to an external powder conveying system to recover the tail powder generated during the conveying process of the external powder conveying system. For example, tail powder generated when ceramic powder is conveyed by a conveyor belt, or when ceramic powder is distributed, or when ceramic powder is rolled into block material by a roller press. Tail powder may be generated in these production processes. This tail powder can be collected by the second tail powder recovery device 30 and then conveyed to the spray drying tower 10 for atomization and drying to obtain the desired particle size of ceramic powder with the required moisture content.

[0051] When collecting these tail powders from the outside, a collection hood can be set above the production process where the tail powder is generated. The collection hood is connected to a second tail powder recovery device 30. The tail powder is sucked into the second tail powder recovery device 30 by the negative pressure generated by the second tail powder recovery device 30, and then sent into the spray drying tower 10 to dry together with the slurry to obtain ceramic powder.

[0052] Specifically, the second tail powder recovery device 30 includes a second negative pressure machine 31, a second dust collector 32, a second sending chamber 33, and a second conveying pipe 34. The second dust collector 32 is used to connect to an external powder conveying system. The second negative pressure machine 31 and the second dust collector 32 are connected. The second sending chamber 33 is located at the outlet of the second dust collector 32. The second conveying pipe 34 is connected to the outlet of the second sending chamber 33 and the material inlet 12. The tail powder generated during the external powder conveying process is sucked in by the second negative pressure machine 31 and collected by the second dust collector 32 to obtain the second tail powder. The second sending chamber 33 holds the second tail powder collected in the second dust collector 32. When a certain amount is reached, it is then conveyed to the spray drying tower 10 through the second conveying pipe 34 and dried together with the slurry sprayed by the slurry spraying device 13 to obtain powder.

[0053] Understandably, the second dust collector 32 is provided with an inlet 321 and a third outlet 322. The inlet 321 is used to suck up powder. After being separated by the second dust collector 32, the powder flows downward through the third outlet 322 into the second sending chamber 33 located below for collection.

[0054] The second dust collector 32 can be a bag filter or a cyclone dust collector, etc., and is not limited here.

[0055] Furthermore, to reduce the overall height of the second tail powder recovery device 30, the second tail powder recovery device 30 also includes a horizontally arranged conveying mechanism 35. The conveying mechanism 35 is located at the outlet of the second dust collector 32 and is connected to the inlet of the second sending chamber 33. For example, a conveyor belt or screw conveyor is used to transport the gradually falling powder to the second sending chamber 33 for centralized collection. Since the conveying mechanism 35 is arranged horizontally, the vertical height of the entire second recovery device can be reduced, facilitating the assembly of the entire second tail powder recovery device 30. In other embodiments, the second recovery device can also use the method of setting a collection hopper 28 as in the first tail powder recovery device 20 for collection.

[0056] Furthermore, in order to control the flow of tail powder from the second dust collector 32 into the second sending chamber 33 and the flow of tail powder from the second sending chamber 33, the second tail powder recovery device 30 also includes a second feed valve 36 and a second discharge valve 37, such as... Figure 6 As shown, the second feed valve 36 is located at the inlet of the second sending chamber 33, and the second discharge valve 37 is located at the outlet of the second sending chamber 33. By setting the second feed valve 36 and the second discharge valve 37, the inlet and outlet of the second sending chamber 33 can be controlled respectively, thereby controlling the entry of tail powder and the output from the second sending chamber 33.

[0057] For example, when feeding is required, the second feed valve 36 is opened and the second discharge valve 37 is closed; after feeding is completed, the second feed valve 36 is closed and the high-pressure gas conveying device 40 is turned on, so that the air pressure in the second sending chamber 33 increases. After reaching a certain air pressure, the second discharge valve 37 is opened, and the powder is conveyed from the second conveying pipe 34 to the spray drying tower 10, where it is dried together with the slurry sprayed by the slurry spraying device 13 to obtain powder.

[0058] Please refer to Figure 6 The second sending chamber 33 has the same structure as the second sending chamber 33, including a second arc-shaped docking section 331, a second transverse diameter section 332, and a second variable diameter section 333. The second arc-shaped docking section 331 has an inlet that connects with the conveying mechanism 35. The second variable diameter section 333 has an outlet that connects with the second conveying pipe 34. The inner diameter of the second transverse diameter section 332 remains unchanged, thereby ensuring the carrying capacity of the second sending chamber 33. The inner diameter of the second variable diameter section 333 gradually decreases from the direction away from the transverse diameter section, so that when the powder flows out of the second sending chamber 33, it can have a converging and guiding effect, and gradually discharge the powder.

[0059] Please see Figure 1 , Figure 5 as well as Figure 6In one embodiment of this utility model, when the high-pressure gas conveying device 40 is installed, the high-pressure gas conveying device 40 includes at least a gas storage tank 41, a first gas supply pipe 42, and a second gas supply pipe 43. The first gas supply pipe 42 is connected to the gas storage tank 41 and the first tail powder recovery device 20, respectively. The second gas supply pipe 43 is connected to the gas storage tank 41 and the second tail powder recovery device 30, respectively. Specifically, the first gas supply pipe 42 is connected to the first sending chamber 24, and the second gas supply pipe 43 is connected to the second sending chamber 33, so as to pressurize the powder in the first sending chamber 24 and the second sending chamber 33, respectively, so as to smoothly press the powder from the first conveying pipe 25 and the second conveying pipe 34 into the spray drying tower 10.

[0060] Furthermore, to prevent blockage in the first conveying pipe 25 or the second conveying pipe 34 when the powder is extruded from the first sending chamber 24 or the second sending chamber 33, the high-pressure gas conveying device 40 also includes a first fluidizing pipe 44 and a second fluidizing pipe 45; the first fluidizing pipe 44 is connected between the first gas supply pipe 42 and the first tail powder recovery device 20, and the outlet of the first fluidizing pipe 44 is located below the outlet of the first gas supply pipe 42; the second fluidizing pipe 45 is connected between the second gas supply pipe 43 and the second tail powder recovery device 30, and the outlet of the second fluidizing pipe 45 is located below the outlet of the second gas supply pipe 43, specifically... The first fluidizing pipe 44 connects the second gas supply pipe 43 and the first sending chamber 24, and the second fluidizing pipe 45 connects the second gas supply pipe 43 and the second sending chamber 33. Thus, when high-pressure gas is supplied through the gas storage tank 41 to pressurize the powder in each sending chamber, high-pressure gas also flows into the fluidizing pipe. The high-pressure gas causes the powder to tumble and become fluffy, preventing blockage of the corresponding conveying pipe when it flows out of each sending chamber. Furthermore, by controlling the ratio of high-pressure gas flowing into the sending chamber from each gas supply pipe and each fluidizing pipe, the powder can be stably conveyed through the conveying pipe, avoiding blockage.

[0061] Specifically, since the powder is concentrated in the first diameter-changing section 243 or the second diameter-changing section 333, the outlet of the first air supply pipe 42 is located in the first arc-shaped connecting section 241, and the outlet of the first fluidizing pipe 44 is located in the first diameter-changing section 243; the outlet of the second air supply pipe 43 is located in the second arc-shaped connecting section 331, and the outlet of the second fluidizing pipe 45 is located in the second diameter-changing section 333. Thus, the first fluidizing pipe 44 and the second fluidizing pipe 45 can apply air pressure to the powder respectively, causing the material to tumble.

[0062] Furthermore, in order to control the on / off of the air intake in each gas supply pipe and each fluidization pipe, the high-pressure gas conveying device 40 includes at least two first control valves 46 and at least two second control valves 47; the first fluidization pipe 44 and the first gas supply pipe 42 are each equipped with a first control valve 46, and each first control valve 46 is used to control the on / off of the gas supply to the first fluidization pipe 44 and the first gas supply pipe 42, respectively. The first control valve 46 located on the first gas supply pipe 42 is located at the interface between the first fluidization pipe 44 and the first gas supply pipe 42 and the first tail powder recovery device 20. Between; a second control valve 47 is provided on both the second fluidization pipe 45 and the second gas supply pipe 43. Each second control valve 47 is used to control the on / off of the gas supply to the second fluidization pipe 45 and the second gas supply pipe 43. The second control valve 47 located on the second gas supply pipe 43 is located between the interface of the second fluidization pipe 45 and the second gas supply pipe 43 and the second tail powder recovery device 30. Thus, by setting the first control valve 46 and the second control valve 47, the on / off of the gas flowing into the first sending chamber 24 and the second sending chamber 33 or the gas supply ratio can be controlled respectively.

[0063] For example, both the first control valve 46 and the second control valve 47 can be set as solenoid valves, which can not only control the on / off of the gas, but also control the amount of gas in their respective passages, thereby controlling the gas ratio and making it easier to control the output of powder.

[0064] Furthermore, in order to flexibly control the supply of gas from the gas storage tank 41 to the first tail powder recovery device 10 or the second tail powder recovery device 30, the high-pressure gas conveying device 40 may include three first control valves 46 and three second control valves 47. Each of the first fluidizing pipe 44 and the second fluidizing pipe 45 is provided with a first control valve 46 and a second control valve 47. Two first control valves 46 are located at the front and rear ends of the interface between the first fluidizing pipe 44 and the first gas supply pipe 42, and two second control valves 47 are located at the front and rear ends of the interface between the second fluidizing pipe 45 and the second gas supply pipe 43. In this way, by setting the first control valves 46 or the second control valves 47, it is possible not only to control the gas ratio of each sending chamber, but also to individually control the gas to be conveyed only to the first sending chamber 24 or the second sending chamber 33, which facilitates the control of the gas flow direction.

[0065] Furthermore, to ensure the safety of powder conveying, safety valves can be installed in the first sending chamber 24 and the second sending chamber 33 respectively to detect the pressure in the first sending chamber 24 and the second sending chamber 33, preventing explosions due to excessive pressure. For example, when excessive pressure is detected, the valves can be automatically opened to release pressure, thereby ensuring the safe operation of the entire equipment.

[0066] The above-mentioned tail powder recovery system 100 is used as follows: the first feed valve 26 and / or the second feed valve 36 are opened respectively, and the corresponding first discharge valve 27 and / or the second discharge valve 37 are closed. The first dust collector 23 and the second dust collector 32 collect the tail powder into the corresponding first sending chamber 24 and the corresponding sending chamber 33. After feeding is completed, the corresponding first feed valve 26 or the second feed valve 27 is closed, and the air storage tank 41 is opened to pressurize the powder in the first sending chamber 24 and / or the second sending chamber 33 through the first air supply pipe 42 and / or the second air supply pipe 43 respectively. When the pressure in the corresponding sending chamber reaches the preset value, the first control valve on the first air supply pipe 42 and / or the second air supply pipe 43 is closed. 46. ​​The second control valve 47 opens the corresponding first discharge valve 27 and / or second discharge valve 37, and gas is introduced into the first fluidization pipe 44 and / or the second fluidization pipe 45 to the first sending chamber 24 and / or the second sending chamber 33, so that the powder in the first sending chamber 24 and / or the second sending chamber 33 is tumbled and becomes fluffy, so as to avoid the powder clogging the first conveying pipe 25 or the second conveying pipe 34. The powder conveyed through the first conveying pipe 25 and / or the second conveying pipe 34 enters the spray drying tower 10, combines with the slurry sprayed by the slurry spraying device 13, re-granulates, and exchanges heat with the hot airflow flowing in from the air inlet 14 to obtain the finished granules with qualified particle size, and finally flows out from the first discharge port 15 by its own gravity.

[0067] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A tailings recovery system (100), characterized in that, include: A spray drying tower (10) having a tail powder outlet (11) and a material inlet (12); The first tail powder recovery device (20) is connected to the tail powder outlet (11) and is used to recover the first tail powder generated by the spray drying tower (10). The outlet of the first tail powder recovery device (20) is connected to the material inlet (12). The second tail powder recovery device (30) is connected to the external powder conveying system and is used to recover the second tail powder generated by the powder conveying system. The outlet of the second tail powder recovery device (30) is connected to the material inlet (12). A high-pressure gas conveying device (40) is connected to the first tail powder recovery device (20) and the second tail powder recovery device (30) respectively, and is used to apply pressure to the first tail powder recovery device (20) and the second tail powder recovery device (30) respectively, so that the first tail powder and the second tail powder flow into the spray drying tower (10).

2. The tailings recovery system (100) according to claim 1, characterized in that, The first tail powder recovery device (20) includes an outlet pipe (21), a first negative pressure machine (22), a first dust collector (23), a first sending chamber (24), and a first conveying pipe (25). The outlet pipe (21) is connected between the tail powder outlet (11) and the first dust collector (23). The first negative pressure machine (22) and the first dust collector (23) are connected. The first sending chamber (24) is located at the outlet of the first dust collector (23). The first conveying pipe (25) is connected to the outlet of the first sending chamber (24) and the material inlet (12).

3. The tailings recovery system (100) according to claim 2, characterized in that, The first tail powder recovery device (20) also includes a first feed valve (26) and a first discharge valve (27). The first feed valve (26) is located at the inlet of the first sending chamber (24), and the first discharge valve (27) is located at the outlet of the first sending chamber (24).

4. The tail powder recovery system (100) according to claim 2 or 3, characterized in that, The first tail powder recovery device (20) includes a collection hopper (28) and a plurality of first dust collectors (23). The collection hopper (28) is located at the outlet of the plurality of first dust collectors (23) and at the inlet of the first sending bin (24).

5. The tailings recovery system (100) according to any one of claims 1-3, characterized in that, The second tail powder recovery device (30) includes a second negative pressure machine (31), a second dust collector (32), a second sending chamber (33), and a second conveying pipe (34). The second dust collector (32) is used to connect to an external powder conveying system. The second negative pressure machine (31) and the second dust collector (32) are connected. The second sending chamber (33) is located at the outlet of the second dust collector (32). The second conveying pipe (34) is connected to the outlet of the second sending chamber (33) and the material inlet (12).

6. The tailings recovery system (100) according to claim 5, characterized in that, The second tail powder recovery device (30) also includes a second feed valve (36) and a second discharge valve (37). The second feed valve (36) is located at the inlet of the second sending chamber (33), and the second discharge valve (37) is located at the outlet of the second sending chamber (33).

7. The tailings recovery system (100) according to claim 5, characterized in that, The second tail powder recovery device (30) also includes a conveying mechanism (35) arranged in a horizontal direction. The conveying mechanism (35) is located at the outlet of the second dust collector (32) and is connected to the inlet of the second sending chamber (33).

8. The tail powder recovery system (100) according to any one of claims 1-3, characterized in that, The high-pressure gas conveying device (40) includes at least a gas storage tank (41), a first gas supply pipeline (42) and a second gas supply pipeline (43). The first gas supply pipeline (42) is connected to the gas storage tank (41) and the first tail powder recovery device (20) respectively, and the second gas supply pipeline (43) is connected to the gas storage tank (41) and the second tail powder recovery device (30) respectively.

9. The tail powder recovery system (100) according to claim 8, characterized in that, The high-pressure gas conveying device (40) also includes a first fluidizing pipe (44) and a second fluidizing pipe (45); The first fluidizing pipe (44) is connected between the first gas supply pipe (42) and the first tail powder recovery device (20), and the outlet of the first fluidizing pipe (44) is located below the outlet of the first gas supply pipe (42). The second fluidizing pipe (45) is connected between the second gas supply pipe (43) and the second tail powder recovery device (30), and the outlet of the second fluidizing pipe (45) is located below the outlet of the second gas supply pipe (43).

10. The tail powder recovery system (100) according to claim 9, characterized in that, The high-pressure gas delivery device (40) also includes at least two first control valves (46) and at least two second control valves (47); The first fluidizing pipe (44) and the first gas supply pipe (42) are each provided with the first control valve (46), and each of the first control valves (46) is used to control the on / off of the gas supply to the first fluidizing pipe (44) and the first gas supply pipe (42). The second fluidization pipe (45) and the second gas supply pipe (43) are each provided with a second control valve (47), and each second control valve (47) is used to control the on / off of the gas supply to the second fluidization pipe (45) and the second gas supply pipe (43).

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