A pneumatic conveying device for viscous and wet materials and a spodumene roasting system

Abstract

This invention relates to the field of pneumatic pipeline conveyor technology, and more particularly to a pneumatic conveying device for viscous and wet materials and a spodumene roasting system. The pneumatic conveying device for viscous and wet materials includes a housing; a heating device, a suspension drying furnace, a pneumatic conveyor, and a grinding mechanism are installed on the housing; the suspension drying furnace has a raw material inlet in the middle for receiving materials, and a light material outlet at the top for discharging dried powder; the lower middle part of the suspension drying furnace is connected to the heating device for introducing hot air to dry the materials; the suspension drying furnace, grinding mechanism, and pneumatic conveyor are connected in a loop for guiding heavy materials from the suspension drying furnace into the grinding mechanism for grinding into fine powder, which is then pneumatically conveyed back to the suspension drying furnace for drying; this allows the viscous and wet materials to circulate repeatedly between the suspension drying furnace and the grinding mechanism until they are ground and dried into fine powder meeting design requirements, providing dry materials for subsequent roasting and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of pneumatic pipeline conveyor technology, and in particular to a pneumatic conveying device for viscous and wet materials and a spodumene roasting system. Background Technology

[0002] The production process of lithium products usually includes steps such as preheating, roasting and transformation of spodumene, and acid leaching. In order to improve the roasting and transformation rate of spodumene, the industry usually crushes and grinds spodumene raw materials into lithium ore powder, and uses lithium ore powder as raw material for lithium extraction process.

[0003] The process requires first conveying lithium ore powder from the silo to the preheater via a conveying device. After preheating, the material enters the rotary kiln for roasting and transformation. Chinese utility model patent CN212892733U discloses a pneumatic conveying device capable of conveying various types of sepiolite powder, including a silo pump, a boiling chamber, and high and low pressure air inlet devices. This device controls the gas to fluidize the material in the boiling chamber and pneumatically convey it to the target location. However, lithium ore powder often becomes damp and sticky during storage, agglomerating into clumps. During preheating, high-temperature flue gas has difficulty penetrating the clumps. The lithium ore powder inside the clumps does not reach the preheating temperature, resulting in insufficient roasting in the rotary kiln and affecting the spodumene roasting and transformation rate. Chinese utility model patent with patent publication number CN216613130U discloses a pneumatic conveying device for conveying calcium carbonate powder, including a crushing device and a heating box. However, the crushing and drying are in a linear series, resulting in limited drying effect. Moreover, the drying effect is not ideal when processing raw materials that are sticky and wet and form lumps. Summary of the Invention

[0004] To address the technical problem of low spodumene roasting conversion rates caused by the formation of clumps from sticky lithium ore powder in existing technologies, this invention provides a pneumatic conveying device for sticky materials and a spodumene roasting system. The pneumatic conveying device for sticky materials employs a circulating loop design for the suspension drying furnace, grinding mechanism, and pneumatic conveyor, allowing the sticky material to circulate repeatedly between the suspension drying furnace and the grinding mechanism until it is ground and dried into fine powder meeting design requirements. This provides dry material for subsequent roasting, improving production efficiency.

[0005] First, the present invention provides a pneumatic conveying device for sticky and wet materials, including a housing; a heating device, a suspension drying furnace, a pneumatic conveyor, and a grinding mechanism are installed on the housing; The suspension dryer has a raw material inlet in the middle for receiving materials and a light material outlet at the top for discharging dried powder. The lower part of the suspension drying oven is connected to the heating device to introduce hot air to dry the material; The suspension drying furnace, grinding mechanism, and pneumatic conveyor are connected in a loop to guide the heavy material in the suspension drying furnace into the grinding mechanism for grinding into fine powder, and then pneumatically convey it back to the suspension drying furnace for drying.

[0006] It should be noted that in this invention, "materials," "raw materials," "heavy materials," "light materials," and "fine powder" all refer to lithium ore powder. "Materials" is a general term; "raw materials," "heavy materials," "light materials," and "fine powder" distinguish materials at different processing stages or in different states, aiming to clarify the state changes of materials in the circulation loop. "Raw materials" specifically refer to the initial state of the material before entering the suspension dryer, typically containing high moisture content and potentially exhibiting agglomeration. "Heavy materials" refer to lithium ore powder particles or clumps that are discharged from the bottom of the suspension dryer into the grinding mechanism because their weight is greater than the rising airflow within the dryer. These lithium ore powder particles are unagglomerated but have a large particle size and high weight; the clumps are usually formed due to stickiness and moisture. "Light materials" refer to lithium ore powder that is discharged from the top of the suspension dryer because its weight is less than the rising airflow. These light materials are typically unagglomerated particles with a small particle size and low weight, easily meeting preheating requirements. "Fine powder" refers to lithium ore powder that has been ground and dispersed by a grinding machine, resulting in smaller particle sizes.

[0007] Furthermore, in order to better realize the present invention, the heating device includes a fan and a hot air furnace connected to the fan for providing hot air, or the heating device includes a fan and a grate cooler externally connected to the fan for providing hot air; The fan is mounted on the casing, and the fan outlet is connected to the hot air inlet located in the lower part of the suspension drying oven to introduce hot air into the suspension drying oven.

[0008] Furthermore, in order to better realize the present invention, a diverter is installed at the air outlet of the fan; the diverter includes a connector and at least one diverter pipe; the connecting end of the diverter pipe is connected to the air outlet of the fan through the connector, and the diverter end of the diverter pipe extends upward in the inner cavity of the suspension drying oven.

[0009] Furthermore, in order to better realize the present invention, multiple shunt pipes extend from the connector outwards and are arranged in a ring array.

[0010] Furthermore, in order to better realize the present invention, the branching ends of the multiple branching pipes are distributed in any one of the following ways: single-ring distribution, concentric ring distribution, or plum blossom distribution.

[0011] Furthermore, in order to better realize the present invention, the diverter pipe consists of a first straight pipe section, a first bend, a second straight pipe section, a second bend, and a third straight pipe section from the connection end to the diverter end; the first straight pipe section and the third straight pipe section both extend along the axial direction of the diverter; the first bend bends outward from the axial direction of the diverter; the second straight pipe section extends from the first bend to the second bend; the second bend bends from the second straight pipe section towards the axial direction of the diverter and connects with the third straight pipe section.

[0012] Furthermore, in order to better realize the present invention, the middle part of the suspension drying furnace is provided with an air inlet connected to the pneumatic conveyor; the air inlet is higher than the raw material inlet, so that the pressurized gas input by the pneumatic conveyor forms an upward airflow above the raw material inlet, thereby carrying the material upward and discharging it from the light material outlet.

[0013] Furthermore, to better realize the present invention, the bottom plate of the suspension drying furnace is arranged at an inclination or in a funnel shape, and a heavy material outlet is provided at the lowest point of the bottom plate; after the heavy material in the suspension drying furnace sinks to the bottom plate, it enters the inner cavity of the grinding mechanism from the upper part of the grinding mechanism through the heavy material outlet; the grinding mechanism includes a grinding roller and two guide plates installed in the housing, the two guide plates are arranged in a V shape and form a guide trough for the material to continue to fall; the grinding roller is located below the guide trough and is used to break up and grind the heavy material falling from the suspension drying furnace.

[0014] Furthermore, to better realize the present invention, an inclined feeding plate is provided at the bottom of the suspension drying furnace, and the end of the feeding plate is located at the upper part of the grinding mechanism; the heavy material in the suspension drying furnace sinks to the feeding plate and slides into the grinding mechanism; the grinding mechanism includes a grinding roller and a guide plate installed in the housing, the feeding plate and the guide plate are arranged in a V shape and form a guide trough for the material to continue falling; the grinding roller is located below the guide trough and is used to break up and grind the heavy material falling from the suspension drying furnace.

[0015] Furthermore, in order to better realize the present invention, the grinding mechanism also includes a storage bin disposed inside the housing and located below the grinding roller; the feed inlet of the pneumatic conveyor is connected to the storage bin.

[0016] Secondly, the present invention also provides a spodumene roasting system, comprising a pneumatic conveying device, a preheater, a rotary kiln, and a grate cooler connected in sequence; the pneumatic conveying device is the aforementioned pneumatic conveying device for sticky and wet materials.

[0017] The beneficial effects of this invention are as follows.

[0018] (1) The pneumatic conveying device for sticky and wet materials provided by the present invention replaces the traditional linear process with a circulating loop, realizes the automatic return of heavy materials, repeated drying and grinding, reduces energy consumption and operating costs, and achieves full-process optimization through system integration and waste heat utilization, which is more in line with the requirements of green production.

[0019] (2) The pneumatic conveying device for sticky and wet materials provided by the present invention achieves uniform air distribution through the flow distribution of the annular array on the one hand, and achieves automatic sorting of materials by utilizing the relationship between wind force and gravity based on the gravity difference between lumpy materials and non-lumpy materials on the other hand. The design is ingenious.

[0020] (3) The spodumene roasting system provided by the present invention applies the optimized pneumatic conveying device to the front-end pretreatment, ensuring the uniformity of particle size and dryness of the material entering the kiln, thereby improving the roasting efficiency and product quality.

[0021] (4) The spodumene roasting system provided by the present invention has a small footprint, low maintenance cost, and is easy to automate, and has significant industrial application value and promotion prospects. Attached Figure Description

[0022] Figure 1 This is a perspective view of the pneumatic conveying device for sticky and wet materials according to the present invention.

[0023] Figure 2 for Figure 1 The side panel of the grinding mechanism is removed to show the internal structure of the grinding mechanism, and a schematic diagram of the internal structure of the suspension drying oven is shown by cutting open the side wall of the suspension drying oven.

[0024] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0025] Figure 4 This is a schematic diagram of the first connection of the pneumatic conveying device for viscous and wet materials described in this invention in a spodumene roasting system.

[0026] Figure 5 This is a schematic diagram of a second connection of the pneumatic conveying device for viscous and wet materials described in this invention within a spodumene roasting system.

[0027] In the diagram: 1-fan; 2-hot air furnace; 3-suspension drying furnace; 31-raw material inlet; 32-light material outlet; 4-shell; 5-pneumatic conveyor; 6-grinding roller; 7-guide plate; 8-feeding plate; 9-diverter; 91-connector; 92-diverter pipe; 10-heavy material outlet; 11-storage bin; 100-raw material bin; 101-pneumatic conveying device; 102-preheater; 103-rotary kiln; 104-grate cooler. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of the various possible embodiments of the present invention, intended to provide a basic understanding of the invention, but is not intended to identify the key or decisive elements of the invention or to limit the scope of protection sought.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the implementation of the present invention is not limited thereto.

[0031] Example 1:

[0032] This embodiment provides a pneumatic conveying device for sticky and wet materials, such as... Figure 1 As shown, the system includes a housing 4, a heating device, a suspension drying oven 3, a pneumatic conveyor 5, and a grinding mechanism. The suspension drying oven 3, the pneumatic conveyor 5, the grinding mechanism, and the heating device are all mounted on the housing 4.

[0033] The suspension dryer 3 is provided with a raw material inlet 31 for receiving materials in the middle, and a light material outlet 32 ​​for discharging dried powder at the top of the suspension dryer 3. The lower part of the suspension drying oven 3 is connected to the heating device to introduce hot air to dry the material; The suspension drying oven 3, the grinding mechanism, and the pneumatic conveyor 5 are connected in a loop to introduce the heavy material in the suspension drying oven 3 into the grinding mechanism for grinding into fine powder, and then pneumatically convey it back to the suspension drying oven 3 for drying.

[0034] The housing 4 serves as the mounting carrier, and a heating device, a suspension drying furnace 3, a pneumatic conveyor 5, and a grinding mechanism are mounted on the housing 4. The heating device, suspension drying furnace 3, pneumatic conveyor 5, and grinding mechanism are connected together through the housing 4 to form a single piece of equipment.

[0035] The heating device is connected to the bottom of the suspension drying oven 3 and is used to introduce hot air into the suspension drying oven 3 to suspend, dry and convey the material upward.

[0036] The grinding mechanism is connected to the bottom of the suspension drying furnace 3 and is used to receive heavy materials falling from the suspension drying furnace 3 and grind them into powder.

[0037] The pneumatic conveyor 5 is connected to the grinding mechanism at one end and to the suspension drying furnace 3 at the other end, and is used to transport the powdered material ground by the grinding mechanism back to the suspension drying furnace 3.

[0038] The suspension drying furnace 3 has a raw material inlet 31 on its side wall for receiving raw materials to be dried and preheated, especially materials that have become damp and clumped during storage. The suspension drying furnace 3 is connected to a heating device to introduce hot air to dry the materials. At the same time, the suspension drying furnace 3 is connected in sequence to a grinding mechanism and a pneumatic conveyor 5 to form a material return circulation loop, which is used to guide the heavy materials in the suspension drying furnace 3 into the grinding mechanism for grinding into fine powder, and then the ground fine powder is pneumatically conveyed back to the suspension drying furnace 3 for drying. The dried powder is pneumatically pushed to the light material outlet 32 ​​and enters the equipment for the next process.

[0039] Example 2:

[0040] This embodiment describes the structure of the suspension drying oven 3 in detail, based on embodiment 1.

[0041] The suspension dryer 3 has a raw material inlet 31 in the middle for receiving materials.

[0042] The suspension dryer 3 has an air inlet in the middle, which is higher than the raw material inlet 31. This air inlet is used to make the pressurized gas input by the pneumatic conveyor 5 form an upward airflow above the raw material inlet 31, thereby carrying the light, dry material that floats in the upper part of the inner cavity of the suspension dryer 3 upward and being discharged from the light material outlet 32.

[0043] The lower middle part of the suspension drying oven 3 is equipped with a hot air inlet, which is used to connect with the heating device to introduce hot air to dry the material.

[0044] The top of the suspension drying furnace 3 is equipped with a light material outlet 32 ​​for discharging light materials, which are generally dried lithium ore powder particles.

[0045] The bottom of the suspension drying furnace 3 is provided with a heavy material outlet 10, which is used to discharge the sinking heavy material and introduce it into the grinding mechanism.

[0046] To better guide the sinking heavy material into the grinding mechanism without power, the bottom plate of the suspension dryer 3 is arranged at an incline or in a funnel shape, with the lowest point of the bottom plate being the heavy material outlet 10. After the heavy material in the suspension dryer 3 sinks to the bottom plate, it enters the interior of the grinding mechanism from the upper part through the heavy material outlet 10. When using an inclined bottom plate to guide the heavy agglomerates into the grinding mechanism without power, the bottom plate is usually fixedly connected to the furnace body of the suspension dryer 3, such as by welding.

[0047] In another specific implementation, such as Figure 2 As shown, a feeding plate 8 is inclinedly arranged at the bottom of the suspension drying furnace 3, and the end of the feeding plate 8 is located at the upper part of the grinding mechanism; the heavy material in the suspension drying furnace 3 sinks to the feeding plate 8 and then slides into the grinding mechanism.

[0048] The other parts of this embodiment are the same as those in Embodiment 1, so they will not be described again.

[0049] Example 3:

[0050] This embodiment, based on embodiment 1 or embodiment 2, provides a detailed description of the heating device and hot air distribution structure.

[0051] This embodiment provides two specific structural forms of heating devices: one is an independent hot air furnace 2 system, and the other is an external grate cooler 104 waste heat recovery system.

[0052] The first type of heating device includes a blower 1 and a hot air furnace 2 connected to the blower 1 for providing hot air. The blower 1 and the hot air furnace 2 are connected and both are mounted on the casing 4. The air outlet of the blower 1 is connected to the bottom of the suspension drying oven 3.

[0053] The second type of heating device includes a fan 1 connected externally to a grate cooler 104 for providing hot air. The fan 1 is connected to the air outlet of the grate cooler 104 to extract waste heat gas from the grate cooler 104. The air outlet of the fan 1 is connected to the bottom of the suspension drying furnace 3 to send the extracted waste heat gas into the furnace to dry the material.

[0054] The two heating devices differ in structure, primarily in the method of obtaining the hot air source and the independence of system integration. However, both heating devices utilize a fan 1 to transport hot air into the suspension drying oven 3. Therefore, the fan 1 is mounted on the casing 4, and its outlet is connected to a hot air inlet located in the lower part of the suspension drying oven 3 to introduce hot air into the suspension drying oven 3.

[0055] To distribute heat more evenly and efficiently, such as Figure 2 , Figure 3 As shown, a distributor 9 is installed at the air outlet of the fan 1. The distributor 9 includes a connector 91 and at least one distributor pipe 92; the connecting end of the distributor pipe 92 is connected to the air outlet of the fan 1 through the connector 91, and the branching end of the distributor pipe 92 extends upward in the inner cavity of the suspension drying oven 3. The distributor pipe 92 is installed at one end of the connector 91, and the other end of the connector 91 is connected to the fan 1. The distributor pipe 92 extends from the connector 91 to the surrounding area of ​​the connector 91, such as... Figure 3 As shown, multiple shunt pipes 92 extend from the connector 91 outwards and are arranged in a ring array.

[0056] Furthermore, the branching ends of the multiple branch pipes 92 adopt any one of the following distribution patterns: single-ring distribution, concentric ring distribution, or plum blossom distribution.

[0057] Furthermore, the diverter 92 consists of a first straight pipe section, a first bend, a second straight pipe section, a second bend, and a third straight pipe section from the connection end to the diverter end. The first straight pipe section and the third straight pipe section both extend along the axial direction of the diverter 9. The first bend bends outward from the axial direction of the diverter 9. The second straight pipe section extends from the first bend to the second bend. The second bend bends from the second straight pipe section towards the axial direction of the diverter 9 and connects to the third straight pipe section.

[0058] The other parts of this embodiment are the same as those in Embodiment 1 or Embodiment 2, so they will not be described again.

[0059] Example 4:

[0060] This embodiment provides a detailed description of the grinding mechanism based on embodiment 1, embodiment 2, or embodiment 3.

[0061] like Figure 2 As shown, the grinding mechanism includes a grinding roller 6 and two guide plates 7 installed inside the housing 4. The two guide plates 7 are arranged in a V-shape and form a guide trough for the material to continue falling. The grinding roller 6 is located below the guide trough and is used to break up and grind the heavy material falling from the suspension drying oven 3.

[0062] The grinding roller 6 and the guide plate 7 are both installed inside the housing 4. The two guide plates 7 are arranged in a V-shape and there is a gap between them for the material to fall. The grinding roller 6 is located below the guide plate 7.

[0063] In another specific embodiment, the bottom plate and one of the two guide plates 7 are substantially an integral structure. In this case, the grinding mechanism includes a grinding roller 6 and a guide plate 7 installed in the housing 4. A feed plate 8 and a guide plate 7 are arranged in a V-shape to form a guide trough for the material to continue falling. The grinding roller 6 is located below the guide trough and is used to break up and grind the heavy material falling from the suspension drying oven 3.

[0064] Furthermore, the grinding mechanism also includes a storage bin 11 disposed inside the housing 4 and located below the grinding roller 6; the feed inlet of the pneumatic conveyor 5 is connected to the storage bin 11. At this time, the storage bin 11 is a space inside the housing 4, used to temporarily store the ground light material so that the pneumatic conveyor 5 can stably and continuously extract the material and transport it to the next process.

[0065] The other parts of this embodiment are the same as any one of Embodiments 1-3, so they will not be described again.

[0066] Example 5:

[0067] This embodiment, based on the pneumatic conveying device for viscous and wet materials provided in the above embodiments, constructs a novel spodumene roasting system. This spodumene roasting system, as follows... Figure 4 As shown, the system includes a pneumatic conveying device 101, a preheater 102, a rotary kiln 103, and a grate cooler 104 connected in sequence. Material enters the pneumatic conveying device 101 from the raw material silo 100. The pneumatic conveying device 101 dries and grinds the sticky, wet material into powder, then conveys it to the preheater 102 for preheating. Subsequently, the material enters the rotary kiln 103 for calcination and transformation, and then enters the grate cooler 104 for cooling. In this embodiment, the pneumatic conveying device is the same as the pneumatic conveying device for sticky, wet materials described in any one of Examples 1 to 4.

[0068] During operation, the blower 1 in the pneumatic conveying device for sticky and wet materials blows hot air generated by the hot air furnace 2 into the suspension drying furnace 3. Unagglomerated materials, being lightweight, are suspended, dried, and conveyed to the subsequent preheater 102 under the action of the hot air in the suspension drying furnace 3; lumpy materials, being heavier, fall from the suspension drying furnace 3. Typically, the hot air temperature is 200~400℃ and the air velocity is 0.5-2m / s, but this can be adjusted according to actual conditions. As the lumpy materials fall into the suspension drying furnace 3, they are continuously baked by the hot air, becoming less sticky and easier to grind. When the lumpy materials enter the grinding mechanism through the heavy material outlet 10, they are ground into powder by the grinding rollers 6. Then, they are returned to the suspension drying furnace 3 via the pneumatic conveyor 5 for further drying. The dispersed, dry powder is then conveyed from the top of the suspension drying furnace 3 to the preheater 102.

[0069] Therefore, the pneumatic conveying device for viscous and wet materials disclosed in this invention can transform clumps of viscous and wet materials into dry powder with distinct particles during the conveying process. It also increases the temperature of the material, which is beneficial for the preheating and roasting steps in subsequent processes, thereby improving the roasting conversion rate of spodumene.

[0070] In another specific embodiment, the spodumene roasting system includes a pneumatic conveying device for sticky and wet materials, a preheater 102, a rotary kiln 103, and a grate cooler 104 connected in sequence. The hot flue gas from the grate cooler 104 is connected to the air inlet of the blower 1 through a pipeline to achieve hot flue gas recirculation and reuse. In this case, there is no need to set up an additional hot air furnace 2. The hot flue gas discharged from the grate cooler 104 is directly used as the drying heat source and blown into the suspension drying furnace 3 by the blower 1. The working principle of other components is the same as that of setting up a hot air furnace 2, so it will not be described in detail.

[0071] The other parts of this embodiment are the same as any one of Embodiments 1-4, so they will not be described again.

[0072] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A pneumatic conveying device for sticky and wet materials, comprising a housing (4), characterized in that, The shell (4) is equipped with a heating device, a suspension drying oven (3), a pneumatic conveyor (5), and a grinding mechanism; The suspension dryer (3) is provided with a raw material inlet (31) for receiving materials in the middle and a light material outlet (32) for discharging dried powder at the top of the suspension dryer (3). The lower part of the suspension drying furnace (3) is connected to the heating device for introducing hot air to dry the material; The suspension drying furnace (3), the grinding mechanism, and the pneumatic conveyor (5) are connected in a loop to introduce the heavy material in the suspension drying furnace (3) into the grinding mechanism for grinding into fine powder and then pneumatically conveying it back to the suspension drying furnace (3) for drying.

2. The pneumatic conveying device for sticky and wet materials according to claim 1, characterized in that, The heating device includes a fan (1) and a hot air furnace (2) connected to the fan (1) for providing hot air, or the heating device includes a fan (1) and the fan (1) is externally connected to a grate cooler (104) for providing hot air. The fan (1) is installed on the housing (4), and the air outlet of the fan (1) is connected to the hot air inlet located in the lower part of the suspension drying oven (3) to introduce hot air into the suspension drying oven (3).

3. The pneumatic conveying device for sticky and wet materials according to claim 2, characterized in that, A distributor (9) is installed at the air outlet of the fan (1); the distributor (9) includes a connector (91) and at least one distributor pipe (92); the connecting end of the distributor pipe (92) is connected to the air outlet of the fan (1) through the connector (91), and the distributor end of the distributor pipe (92) extends upward in the inner cavity of the suspension drying oven (3).

4. The pneumatic conveying device for sticky and wet materials according to claim 3, characterized in that, Multiple of the aforementioned shunt tubes (92) extend outward from the connector (91) and are arranged in a ring array.

5. The pneumatic conveying device for sticky and wet materials according to claim 3, characterized in that, The shunt ends of the multiple shunt tubes (92) are distributed in any one of the following ways: single-ring distribution, concentric ring distribution, or plum blossom distribution.

6. The pneumatic conveying device for sticky and wet materials according to claim 1, characterized in that, The suspension dryer (3) is provided with an air inlet connected to the pneumatic conveyor (5) in the middle. The air inlet is higher than the raw material inlet (31) so that the pressurized gas input by the pneumatic conveyor (5) forms an upward airflow above the raw material inlet (31), thereby carrying the material upward and discharging it from the light material outlet (32).

7. The pneumatic conveying device for sticky and wet materials according to claim 1, characterized in that, The bottom plate of the suspension drying furnace (3) is arranged at an inclination or in a funnel shape, and a heavy material outlet (10) is provided at the lowest point of the bottom plate; the heavy material in the suspension drying furnace (3) sinks to the bottom plate and then enters the grinding mechanism from the heavy material outlet (10); The grinding mechanism includes a grinding roller (6) and two guide plates (7) installed in the housing (4). The two guide plates (7) are arranged in a V-shape and form a guide trough for the material to continue falling. The grinding roller (6) is located below the guide trough and is used to break up and grind the heavy material falling from the suspension drying oven (3).

8. The pneumatic conveying device for sticky and wet materials according to claim 1, characterized in that, The bottom of the suspension drying furnace (3) is provided with an inclined feeding plate (8), and the end of the feeding plate (8) is located at the upper part of the grinding mechanism; the heavy material in the suspension drying furnace (3) sinks to the feeding plate (8) and then slides into the grinding mechanism. The grinding mechanism includes a grinding roller (6) and a guide plate (7) installed in the housing (4). A feed plate (8) and a guide plate (7) are arranged in a V-shape to form a guide trough for the material to continue falling. The grinding roller (6) is located below the guide trough and is used to break up and grind the heavy material falling from the suspension drying oven (3).

9. The pneumatic conveying device for sticky and wet materials according to claim 7 or 8, characterized in that, The grinding mechanism also includes a storage bin (11) located inside the housing (4) and below the grinding roller (6); the feed inlet of the pneumatic conveyor (5) is connected to the storage bin (11).

10. A spodumene roasting system, comprising a pneumatic conveying device (101), a preheater (102), a rotary kiln (103), and a grate cooler (104) connected in sequence, characterized in that, The pneumatic conveying device (101) is a pneumatic conveying device for sticky and wet materials as described in any one of claims 1-9.

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