Material heating device and lithium ore pretreatment equipment

Abstract

The utility model discloses a material heating device and lithium ore pretreatment equipment, which can quickly heat and accurately control the temperature of a to-be-heated material (such as lithium ore). The material heating device comprises a segmented heating tower, the segmented heating tower comprises a tower body, a plurality of hot air input structures are distributed on the tower body at intervals in the vertical direction, and the hot air input structures are connected with a hot air generation unit. A plurality of preheating chambers which are vertically communicated and a plurality of hot air input structures which are distributed at the lower parts of the plurality of preheating chambers are distributed on a tower body of the sectional heating tower at intervals in the vertical direction; a to-be-heated material input structure is arranged at the position, close to the hot air input structure located at the bottom of the tower body, of the tower body of the segmented heating tower, and a hot air output structure and a heated material output structure are arranged on the upper portion of the tower body of the segmented heating tower. The hot air can be rapidly heated and gradually reaches the temperature of the hot air output by the uppermost hot air input structure.

Description

Technical Field

[0001] The present disclosure relates to the technical field of lithium ore pretreatment, and in particular to a lithium ore pretreatment method, lithium ore pretreatment equipment and a material heating device. Background Art

[0002] The principle of lithium ore sulfuric acid extraction process is to use sulfuric acid to react with metals in lithium ore to generate soluble sulfates to obtain acidified clinker. After leaching, impurity removal and other operations, the acidified clinker is then subjected to lithium precipitation to obtain battery-grade lithium carbonate. Before the lithium ore reacts with sulfuric acid (acidification), the lithium ore needs to be pretreated. At present, the pretreatment of lithium ore usually involves roasting the crushed and dried lithium ore in a rotary kiln. The roasting temperature is generally 850℃-900℃. The main purpose of roasting is to loosen the structure of the lithium ore and defluorinate it.

[0003] Since the roasting temperature is high and the lithium ore needs to be gradually heated in the rotary kiln, the length of the rotary kiln needs to be set longer to meet the roasting needs. This results in the rotary kiln occupying a longer area, which increases the difficulty of arranging the rotary kiln on land with limited length, resulting in an increase in engineering construction costs; in order to fully loosen and defluorinate the lithium ore, the lithium ore needs to stay in the rotary kiln for a longer time, which will not only reduce the pretreatment efficiency, but also cause partial loss of lithium elements; high temperature conditions and the hardness of lithium ore will aggravate the wear of the rotary kiln lining, shorten the service life of the rotary kiln, and the kiln body will also be subjected to greater thermal stress, resulting in high maintenance costs. Utility Model Content

[0004] In view of the above problems, it is proposed to develop a short-range rapid roasting technology based on lithium ore pretreatment, shorten the floor space of the rotary kiln, reduce the roasting time, and improve the heat transfer efficiency. This results in the technical solution of the present disclosure. The present disclosure first provides a lithium ore pretreatment method and a lithium ore pretreatment device to solve the technical problem that the lithium ore roasting device occupies a long floor space. The present disclosure also provides a material heating device and a lithium ore pretreatment device, which can quickly heat and accurately control the temperature of the material to be heated (such as lithium ore).

[0005] In a first aspect, a method for pretreating lithium ore is provided, comprising: inputting crushed and dried lithium ore into a transfer heating device, heating the lithium ore through the transfer heating device to form a preheated lithium ore with a temperature of T1; inputting the preheated lithium ore into a roasting device to roast the preheated lithium ore at a temperature T2 so as to loosen the structure of the preheated lithium ore and defluorinate when the lithium ore contains fluorine; wherein |T2-T1|≤200°C, or |T2-T1|≤150°C, or |T2-T1|≤100°C, or |T2-T1|≤50°C; the transfer heating device adopts a vertical heating structure and / or is connected to the roasting device and is arranged in the width direction of the roasting device.

[0006] In a second aspect, a lithium ore pretreatment device is provided, comprising: a transfer heating device for heating the crushed and dried lithium ore to form a preheated lithium ore with a temperature of T1; a roasting device for roasting the preheated lithium ore at a temperature T2 to loosen the structure of the preheated lithium ore and defluorinate when the lithium ore contains fluorine; wherein |T2-T1|≤200°C, or |T2-T1|≤150°C, or |T2-T1|≤100°C, or |T2-T1|≤50°C; the transfer heating device adopts a vertical heating structure and / or is connected to the roasting device and is arranged in the width direction of the roasting device.

[0007] The core technical concept of the lithium ore pretreatment method of the first aspect and the lithium ore pretreatment equipment of the second aspect is to preheat the crushed and dried lithium ore to a temperature close to the roasting temperature through a transfer heating device, thereby reducing the scale and footprint of the roasting device. At the same time, the transfer heating device adopts a vertical heating structure and / or is arranged in parallel with the roasting device in the width direction of the roasting device, thereby reducing the overall footprint of the pretreatment equipment.

[0008] According to a third aspect, a material heating device is provided, comprising a segmented heating tower, the segmented heating tower comprising a tower body, a plurality of hot air input structures are vertically spaced apart on the tower body, the plurality of hot air input structures are respectively connected to a hot air generating unit, a plurality of vertically connected preheating chambers and a plurality of hot air input structures distributed at the lower parts of the plurality of preheating chambers are vertically spaced apart on the tower body of the segmented heating tower, a material input structure to be heated is provided on the tower body of the segmented heating tower near a hot air input structure located at the bottom of the tower body among the plurality of hot air input structures, and a hot air output structure and a heated material output structure are provided on the upper part of the tower body of the segmented heating tower.

[0009] Optionally, the tower body of the segmented heating tower has a plurality of preheating chambers whose inner diameters increase step by step from bottom to top and are vertically connected.

[0010] Optionally, an intermediate tank is provided on the outside of the segmented heating tower, a discharge hopper is provided at the bottom of the intermediate tank, an exhaust port is provided on the top of the intermediate tank, the tank body of the intermediate tank is connected to the upper part of the tower body of the segmented heating tower, the exhaust port constitutes the outlet of the hot air output structure, and the discharge port of the discharge hopper constitutes the outlet of the heated material output structure.

[0011] Optionally, it comprises a first material preheating system, which comprises a multi-stage vertical preheating module arranged in a stepwise manner, in which the material flow channels of each vertical preheating module are sequentially connected in series in a direction of material stepwise heat exchange and heating, and the hot air flow channels of each vertical preheating module are sequentially connected in series in a direction of hot air stepwise heat exchange and cooling that is opposite to the material stepwise heating direction; the vertical preheating module of the last stage of the multi-stage vertical preheating module adopts the segmented heating tower, the material input structure to be heated is connected to the heated material output port of the vertical preheating module corresponding to the previous stage, and the hot air output structure is connected to the hot air input port of the vertical preheating module corresponding to the previous stage.

[0012] Optionally, the hot air generating unit adopts a hot air furnace or a smelting kiln.

[0013] In a fourth aspect, a lithium ore pretreatment device is provided, comprising: a transfer heating device for heating the crushed and dried lithium ore to form a preheated lithium ore; a roasting device for roasting the preheated lithium ore to loosen the structure of the preheated lithium ore and defluorinate when the lithium ore contains fluorine; wherein the transfer heating device comprises: a hot air generating unit, the hot air generating unit generates hot air by combustion and outputs the hot air as a heating medium; a lithium ore preheating unit, The lithium ore preheating unit brings the hot air from the hot air generating unit into contact with the lithium ore to heat the lithium ore to form preheated lithium ore; the heated lithium ore output port of the lithium ore preheating unit is used to transport the preheated lithium ore to the roasting device; the lithium ore preheating unit comprises a first lithium ore preheating system, and the first lithium ore preheating system comprises M-level vertical preheating modules arranged in a cascade, M is an integer ≥3, and the lithium ore flow passage of each vertical preheating module in the M-level vertical preheating modules is The channels are connected in series in sequence according to the direction of the lithium ore cascade heat exchange and heating, and the hot air flow channels of each vertical preheating module are connected in series in sequence according to the hot air cascade heat exchange and cooling direction opposite to the lithium ore cascade heating direction; the vertical preheating module of the last stage of the M-stage vertical preheating module adopts a segmented heating tower, and a plurality of vertically connected preheating chambers and a plurality of hot air input structures distributed at the lower part of the plurality of preheating chambers are distributed on the tower body of the segmented heating tower at intervals in the vertical direction, and the plurality of hot air input structures are respectively connected to the hot air generating unit, and a lithium ore input structure is provided on the tower body of the segmented heating tower near the hot air input structure located at the bottom of the tower body among the plurality of hot air input structures, and the lithium ore input structure is connected to the lithium ore output port of the corresponding upper-stage vertical preheating module, and a hot air output structure and a lithium ore output structure are provided on the upper part of the tower body of the segmented heating tower, and the hot air output structure is connected to the hot air input port of the corresponding upper-stage vertical preheating module, and the lithium ore output structure is connected to the feed port of the roasting device.

[0014] The material heating device of the third aspect and the lithium ore pretreatment equipment of the fourth aspect both adopt innovatively designed segmented heating towers. The segmented heating tower not only occupies a small area, but also can heat the material to be heated (such as lithium ore) segment by segment through multiple preheating chambers that are vertically connected and spaced apart in the vertical direction. The material to be heated (such as lithium ore) floats from bottom to top in the segmented heating tower, and can be quickly heated and gradually reach the temperature of the hot air output by the top hot air input structure, so as to achieve the purpose of accurately controlling the temperature of the material to be heated (such as lithium ore).

[0015] The present disclosure is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present disclosure will be partially given in the following description, partially become apparent from the following description, or be understood through practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of this specification are used to assist in understanding the present disclosure. The contents provided in the drawings and their related descriptions in this specification may be used to explain the present disclosure, but shall not constitute an improper limitation on the present disclosure.

[0017] Figure 1 This is a schematic diagram of a lithium ore pretreatment device according to an embodiment of the present application from a first perspective.

[0018] Figure 2 for Figure 1 Line drawing of equipment for pre-processing of lithium ore shown.

[0019] Figure 3 for Figure 1 A schematic diagram of the lithium ore pretreatment equipment shown in a second perspective.

[0020] Figure 4 for Figure 3 Line drawing of equipment for pre-processing of lithium ore shown.

[0021] Figure 5 for Figure 1 A schematic diagram of the lithium ore pretreatment equipment shown in the third perspective.

[0022] Figure 6 for Figure 5 Line drawing of equipment for pre-processing of lithium ore shown.

[0023] Figure 2 The medium thick solid arrows indicate the flow direction of lithium ore, and the thick dotted arrows indicate the flow direction of hot air. DETAILED DESCRIPTION

[0024] The present disclosure is described clearly and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the solution of the present disclosure based on these descriptions. Before describing the present disclosure in conjunction with the accompanying drawings, it should be particularly noted that:

[0025] The technical solutions and technical features provided in each section, including the following description, can be combined with each other without conflict. In addition, where possible, these technical solutions, technical features and related combinations can be assigned specific technical themes and protected by relevant patents.

[0026] The embodiments of the present disclosure involved in the following description are generally only a part of the embodiments rather than all the embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of patent protection.

[0027] Regarding the terms and units in this specification: The terms "include", "comprises", "have" and any variations thereof in this specification and the corresponding claims and related parts are intended to cover non-exclusive inclusions. In addition, other relevant terms and units can be reasonably interpreted based on the relevant content provided in this specification.

[0028] Figure 1 This is a schematic diagram of a lithium ore pretreatment device according to an embodiment of the present application from a first perspective. Figure 2 for Figure 1 Line drawing of equipment for pre-processing of lithium ore shown. Figure 3 for Figure 1 A schematic diagram of the lithium ore pretreatment equipment shown in a second perspective. Figure 4 for Figure 3 Line drawing of equipment for pre-processing of lithium ore shown. Figure 5 for Figure 1 A schematic diagram of the lithium ore pretreatment equipment shown in the third perspective. Figure 6 for Figure 5 A line drawing of a lithium ore pre-processing facility is shown. Figure 1-Figure 6 As shown, the lithium ore pretreatment equipment includes: a transfer heating device 1 and a roasting device 2.

[0029] The transfer heating device 1 is used to heat the crushed and dried lithium ore to form preheated lithium ore with a temperature of T1.

[0030] The roasting device 2 is used to roast the preheated lithium ore at a temperature T2 so as to loosen the structure of the preheated lithium ore and defluorinate when the lithium ore contains fluorine.

[0031] Among them, |T2-T1|≤200°C, or |T2-T1|≤150°C, or |T2-T1|≤100°C, or |T2-T1|≤50°C. Generally speaking, T1≤T2, T1 is 700°C-850°C, and T2 is 850°C-900°C.

[0032] In addition, the transfer heating device 1 adopts a vertical heating structure and / or is arranged in parallel with the roasting device 2 in the width direction of the roasting device 2.

[0033] The above-mentioned lithium ore pretreatment equipment preheats the crushed and dried lithium ore to a temperature close to the roasting temperature through the transfer heating device 12, thereby reducing the scale and area occupied by the roasting device 2. At the same time, the transfer heating device 1 adopts a vertical heating structure and / or is arranged in parallel with the roasting device in the width direction of the roasting device, thereby reducing the overall length of the pretreatment equipment.

[0034] The roasting device 2 specifically adopts a rotary kiln. The length of the rotary kiln is greatly shortened compared with the lithium ore pretreatment rotary kiln in the traditional lithium ore sulfuric acid process for lithium extraction.

[0035] In this embodiment, the transfer heating device 1 specifically adopts a vertical heating structure. The transfer heating device 1 specifically comprises: a hot air generation unit 11, the hot air generation unit 11 generates hot air through combustion and outputs the hot air as a heating medium (the hot air generation unit 11 specifically adopts a hot air furnace); a lithium ore preheating unit 12, the lithium ore preheating unit 12 brings the hot air from the hot air generation unit into contact with the lithium ore to heat the lithium ore to form preheated lithium ore; the heated lithium ore output port of the lithium ore preheating unit 12 is used to transport the preheated lithium ore to the roasting device 2.

[0036] The lithium ore preheating unit 12 comprises a first lithium ore preheating system 121. The first lithium ore preheating system 121 comprises M-level vertical preheating modules arranged in a cascade, where M is an integer ≥ 3, and in the M-level vertical preheating modules, the lithium ore flow channels of each vertical preheating module 121a are sequentially connected in series in a direction of cascade heat exchange and heating of the lithium ore, and the hot air flow channels of each vertical preheating module 121a are sequentially connected in series in a direction of hot air cascade heat exchange and cooling opposite to the direction of cascade heating of the lithium ore.

[0037] In each vertical preheating module 121a of the lithium ore first preheating system 121, the lithium ore is in direct contact with the hot air to achieve heat exchange between the lithium ore and the hot air. The vertical preheating module 121a is generally a tower tank structure, and the lithium ore is in contact with the hot air for heat exchange.

[0038] The above-mentioned “step setting” means that there is a height difference between adjacent vertical preheating modules 121a, and the lithium ore in each vertical preheating module 121a enters the adjacent lower vertical preheating module 121a by gravity.

[0039] The first lithium ore preheating system 121 can bring the following beneficial effects in the pretreatment equipment of lithium ore in this embodiment: First, improve thermal efficiency. The lithium ore is heated step by step in the M-level vertical preheating module. The hot air is cooled step by step. This arrangement can maximize the use of the heat of the hot air, improve the heat exchange efficiency and energy utilization rate. Second, shorten the preheating time and reduce the loss of lithium elements. Conventional horizontal preheating of lithium ore uses a single channel, in which the lithium ore is slowly heated. The first lithium ore preheating system 121 disperses the lithium ore into multiple vertical preheating modules at the same time, which is equivalent to decomposing a single preheating process into multiple parallel sub-processes, shortening the time required for the lithium ore to heat up to the target temperature, improving production efficiency, and reducing the loss of lithium elements. Third, make the lithium ore heat up more evenly. The lithium ore in the first lithium ore preheating system 121 is in a loose state and slowly falls, and is fully mixed and contacted with the hot air, so that the lithium ore heats up more evenly, which is conducive to the subsequent roasting process. Fourth, it saves equipment space. Compared with conventional horizontal rotary kilns, the first lithium ore preheating system 121 occupies a much smaller area, saving space for the subsequent roasting device and the layout of the entire lithium extraction production line. Fifth, it reduces equipment wear. Lithium ore flows mainly by gravity in the first lithium ore preheating system 121, and has little mechanical friction with the inner wall of the vertical preheating module 121a, which reduces the frequency of equipment maintenance and maintenance costs as a whole.

[0040] As an improvement, the vertical preheating module 121a of the last stage of the M-stage vertical preheating module adopts a segmented heating tower 13, and a plurality of hot air input structures 131 are distributed at intervals along the vertical direction on the tower body of the segmented heating tower 13, and the plurality of hot air input structures 131 are respectively connected to the hot air generating unit 11, and a plurality of vertically connected preheating chambers and a plurality of hot air input structures 131 distributed at the lower part of the plurality of preheating chambers are distributed at intervals along the vertical direction on the tower body of the segmented heating tower 13. A material input structure to be heated is provided on the tower body of 3 near the hot air input structure 131 located at the bottom of the tower body among the multiple hot air input structures 131, and the lithium ore input structure is connected to the lithium ore output port of the corresponding upper-level vertical preheating module 121a. A hot air output structure and a lithium ore output structure are provided on the upper part of the tower body of the segmented heating tower 13, and the hot air output structure is connected to the hot air input port of the corresponding upper-level vertical preheating module 121a, and the lithium ore output structure is connected to the feed port of the roasting device 2.

[0041] The temperature gradient in the traditional heating tower is single, and the heat utilization rate is not high. The segmented heating tower 13 is provided with multiple hot air input structures 131 in the vertical direction, which divides the tower body into multiple preheating chambers. Independent hot air can be introduced at the bottom of each preheating chamber to achieve segmented control. In this way, the hot air temperature and flow rate of each section can be reasonably allocated according to the temperature of each section of lithium ore, so as to achieve heating according to the section, avoid overheating or underheating, and improve the efficiency of the entire heating process. The segmented heating tower 13 disperses the lithium ore into multiple preheating chambers, the volume of each preheating chamber is relatively small, and the height of the lithium ore stacking layer is reduced. Hot air is blown in from the hot air input structure 131 at the bottom of each preheating chamber, and fully contacts with the loosely stacked ore, which strengthens the heat transfer and makes the lithium ore heated more evenly and quickly. At the same time, the filling rate in the preheating chamber is high, and the hot air utilization rate is high. In summary, the segmented heating tower not only occupies a small area, but also can heat the material to be heated (such as lithium ore) segment by segment through multiple preheating chambers that are vertically connected and spaced apart in the vertical direction. The material to be heated (such as lithium ore) floats from bottom to top in the segmented heating tower, and can be quickly heated and gradually reach the temperature of the hot air output by the top hot air input structure, so as to achieve the purpose of accurately controlling the temperature of the material to be heated (such as lithium ore). The lithium ore is continuously heated in the segmented heating tower 13, and finally coupled and docked with the roasting device 2, so that the continuous connection between preheating and roasting can be realized.

[0042] As an improvement, the tower body of the segmented heating tower 13 has a plurality of preheating chambers (such as Figure 1-Figure 6 As shown, the outer diameter of the tower body of the segmented heating tower 13 increases step by step from bottom to top, corresponding to multiple preheating chambers respectively). Since the lithium ore is input into the segmented heating tower 13 from the material input structure to be heated near the hot air input structure 131 located at the bottom of the tower body, if the inner diameters of the preheating chambers are the same, the flow rate of the hot air at the lithium ore output structure will be greater than the flow rate at the lithium ore input structure, resulting in insufficient preheating of the lithium ore. After the tower body of the segmented heating tower 13 is designed to have multiple preheating chambers whose inner diameters increase step by step from bottom to top and are vertically connected, the flow rate of the lithium ore can be made more uniform and the pressure loss of the hot air can be reduced.

[0043] As an improvement, an intermediate tank 14 is provided outside the segmented heating tower 13, a discharge hopper is provided at the bottom of the intermediate tank 14, an exhaust port is provided at the top of the intermediate tank 14, the tank body of the intermediate tank 14 is connected to the upper part of the tower body of the segmented heating tower 13, the exhaust port constitutes the outlet of the hot air output structure, and the discharge port of the discharge hopper constitutes the outlet of the lithium ore output structure.

[0044] The intermediate tank 14 plays the role of gas-solid separation here, that is, separating the lithium ore overflowing from the top of the segmented heating tower 13 from the hot air, so that the separated lithium ore enters the roasting device 2 from the discharge port of the discharge hopper.

[0045] from Figure 1-Figure 6 It can also be seen that the segmented heating tower 13 in the first lithium ore preheating system 121 is the bottom vertical preheating module 121a, and each vertical preheating module 121a on the upper part of the segmented heating tower 13 adopts a structure similar to the intermediate tank 14, and the discharge port of the discharge hopper of these vertical preheating modules 121a is inserted into the hot air input pipe connected to the hot air input port of the vertical preheating module 121a below.

[0046] In order to make fuller use of the hot air from the hot air generating unit 11, a jacket may be provided on the rotary kiln, and the jacket heats the inside of the rotary kiln by using the hot air output from the hot air generating unit 11. Jacket heating may be an auxiliary heating method of the rotary kiln.

[0047] At this time, as an improvement, the lithium ore preheating unit 12 may also include a lithium ore second preheating system 122, the lithium ore second preheating system 122 includes N-stage vertical preheating modules arranged in stages, N is an integer less than M, in the N-stage vertical preheating modules, the lithium ore flow channels of each vertical preheating module 122a are sequentially connected in series in the direction of lithium ore cascade heat exchange and heating, and the hot air flow channels of each vertical preheating module 122a are sequentially connected in series in the direction of hot air cascade heat exchange and cooling opposite to the lithium ore cascade heating direction, and the hot air flow channels of the N-stage vertical preheating modules sequentially connected in series in the direction of hot air cascade heat exchange and cooling use the hot air from the jacket; the lithium ore output port of the vertical preheating module 122a of the last stage of the N-stage vertical preheating module is connected to the lithium ore output port of the vertical preheating module (i.e., the segmented heating tower 13) of the last stage of the M-stage vertical preheating module to form the heated lithium ore output port.

[0048] The structure of the second lithium ore preheating system 122 is similar to that of the first lithium ore preheating system 121. In this embodiment, the lithium ore output port of the vertical preheating module 122a of the last stage of the N-stage vertical preheating module is directly inserted into the outlet pipe of the bottom discharge hopper of the intermediate tank 14 through an inclined pipe.

[0049] A second lithium ore preheating system 122 is set up. On the one hand, since the hot air of each vertical preheating module 122a of the second lithium ore preheating system 122 comes from the jacket of the rotary kiln, and the jacket uses the hot air output by the hot air generating unit 11, after this part of the hot air passes through the jacket to heat the rotary kiln, the temperature is reduced but it still has a certain amount of heat. By introducing it into the second lithium ore preheating system 122, the remaining heat can be fully utilized to further improve the comprehensive utilization rate and energy efficiency of the hot air; on the other hand, by adjusting the operating parameters of the first lithium ore preheating system 121 and the second lithium ore preheating system 122, such as the hot air flow rate, the heating process of the lithium ore can be more finely controlled, so as to optimize and match according to the properties of the lithium ore, the output requirements, etc., and flexibly adjust to meet different production needs.

[0050] In this embodiment, lithium ore feed ports are respectively provided at the top of the first lithium ore preheating system 121 and the top of the second lithium ore preheating system 122 , which helps to reduce the installation scale of the first lithium ore preheating system 121 .

[0051] The tail gas output by the first lithium ore preheating system 121 and the second lithium ore preheating system 122 can be introduced into the flue gas purification system 3 through a pipeline, and the flue gas purification system 3 is used to purify the hot air used by the lithium ore preheating unit 12. The flue gas purification system 3 specifically includes a dust collector and an SCR denitrification reactor (the SCR denitrification reactor is arranged on the top of the dust collector).

[0052] The above is a description of the relevant contents of the present disclosure. A person skilled in the art will be able to implement the present disclosure based on these descriptions. Based on the above contents of this specification, all other embodiments obtained by a person skilled in the art without making any creative work shall fall within the scope of patent protection.

Claims

1. Material heating device, characterized in that: The invention comprises a segmented heating tower, wherein the segmented heating tower comprises a tower body, wherein a plurality of hot air input structures are distributed at intervals along the vertical direction on the tower body, wherein the plurality of hot air input structures are respectively connected to the hot air generating units, wherein a plurality of vertically connected preheating chambers and a plurality of hot air input structures distributed at the lower parts of the plurality of preheating chambers are distributed at intervals along the vertical direction on the tower body of the segmented heating tower, wherein a structure for inputting materials to be heated is arranged on the tower body of the segmented heating tower near a hot air input structure located at the bottom of the tower body among the plurality of hot air input structures, and a hot air output structure and a heated material output structure are arranged on the upper part of the tower body of the segmented heating tower.

2. The material heating device according to claim 1, characterized in that: The tower body of the segmented heating tower is provided with a plurality of preheating chambers whose inner diameters increase step by step from bottom to top and are vertically connected.

3. The material heating device according to claim 1, characterized in that: An intermediate tank is provided outside the segmented heating tower, a discharge hopper is provided at the bottom of the intermediate tank, an exhaust port is provided at the top of the intermediate tank, the tank body of the intermediate tank is connected to the upper part of the tower body of the segmented heating tower, the exhaust port constitutes the outlet of the hot air output structure, and the discharge port of the discharge hopper constitutes the outlet of the heated material output structure.

4. The material heating device according to claim 1, characterized in that: It comprises a first material preheating system, wherein the first material preheating system comprises a multi-stage vertical preheating module arranged in stages, wherein the material flow channels of each vertical preheating module are sequentially connected in series in a direction of material stage heat exchange and heating, and the hot air flow channels of each vertical preheating module are sequentially connected in series in a direction of hot air stage heat exchange and cooling opposite to the material stage heating direction; the vertical preheating module of the last stage of the multi-stage vertical preheating module adopts the segmented heating tower, the material input structure to be heated is connected to the heated material output port of the corresponding upper stage vertical preheating module, and the hot air output structure is connected to the hot air input port of the corresponding upper stage vertical preheating module.

5. The material heating device according to claim 1, characterized in that: The hot air generating unit is a hot air furnace or a smelting kiln.

6. Lithium ore pretreatment equipment, characterized in that: include: A transfer heating device is used to heat the crushed and dried lithium ore to form preheated lithium ore; A roasting device, used for roasting the preheated lithium ore to loosen the structure of the preheated lithium ore and defluorinate when the lithium ore contains fluorine; Wherein, the transfer heating device comprises: a hot air generating unit, the hot air generating unit generating hot air by combustion and outputting the hot air as a heating medium; A lithium ore preheating unit, wherein the lithium ore preheating unit brings the hot air from the hot air generating unit into contact with the lithium ore to heat the lithium ore to form preheated lithium ore; The heated lithium ore output port of the lithium ore preheating unit is used to transport the preheated lithium ore to the roasting device; The lithium ore preheating unit comprises a first lithium ore preheating system, and the first lithium ore preheating system comprises M-level vertical preheating modules arranged in a cascade, where M is an integer ≥ 3, and in the M-level vertical preheating modules, the lithium ore flow channels of each vertical preheating module are sequentially connected in series according to the lithium ore cascade heat exchange temperature increase direction, and the hot air flow channels of each vertical preheating module are sequentially connected in series according to the hot air cascade heat exchange temperature reduction direction opposite to the lithium ore cascade temperature increase direction; The vertical preheating module of the last stage of the M-stage vertical preheating module adopts a segmented heating tower, and a plurality of vertically connected preheating chambers and a plurality of hot air input structures distributed at lower parts of the plurality of preheating chambers are distributed on the tower body of the segmented heating tower at intervals in the vertical direction, and the plurality of hot air input structures are respectively connected to the hot air generation units, and a lithium ore input structure is provided on the tower body of the segmented heating tower near the hot air input structure located at the bottom of the tower body among the plurality of hot air input structures, and the lithium ore input structure is connected to the lithium ore output port of the corresponding upper-stage vertical preheating module, and a hot air output structure and a lithium ore output structure are provided on the upper part of the tower body of the segmented heating tower, and the hot air output structure is connected to the hot air input port of the corresponding upper-stage vertical preheating module, and the lithium ore output structure is connected to the feed port of the roasting device.

7. The lithium ore pretreatment equipment according to claim 6, characterized in that: The tower body of the segmented heating tower has a plurality of preheating chambers whose inner diameters increase step by step from bottom to top and are vertically connected, and the plurality of hot air input structures are distributed at the lower part of each of the plurality of preheating chambers.

8. The lithium ore pretreatment equipment according to claim 6, characterized in that: An intermediate tank is provided outside the segmented heating tower, a discharge hopper is provided at the bottom of the intermediate tank, an exhaust port is provided at the top of the intermediate tank, the tank body of the intermediate tank is connected to the upper part of the tower body of the segmented heating tower, the exhaust port constitutes the outlet of the hot air output structure, and the discharge port of the discharge hopper constitutes the outlet of the lithium ore output structure.

9. The lithium ore pretreatment device according to claim 6, characterized in that: The roasting device adopts a rotary kiln, and the rotary kiln is provided with a jacket, and the jacket uses the hot air output by the hot air generating unit to heat the inside of the rotary kiln; The lithium ore preheating unit comprises a lithium ore second preheating system, the lithium ore second preheating system comprises N-stage vertical preheating modules arranged in a cascade, N is an integer less than M, in the N-stage vertical preheating modules, the lithium ore flow channels of each vertical preheating module are sequentially connected in series in a direction of lithium ore cascade heat exchange and heating, and the hot air flow channels of each vertical preheating module are sequentially connected in series in a direction of hot air cascade heat exchange and cooling opposite to the lithium ore cascade heating direction, and the hot air flow channels of the N-stage vertical preheating modules sequentially connected in series in a direction of hot air cascade heat exchange and cooling use hot air from the jacket; The lithium ore output port of the vertical preheating module at the last stage of the N-stage vertical preheating module is connected to the lithium ore output port of the vertical preheating module at the last stage of the M-stage vertical preheating module to form the heated lithium ore output port.

10. The lithium ore pretreatment equipment according to claim 6, characterized in that: The transfer heating device also includes a flue gas purification system, which is used to purify the hot air used by the lithium ore preheating unit.

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