A rotary kiln and smelting slag disposal equipment

Abstract

The application discloses a rotary kiln and smelting slag disposal equipment. The rotary kiln comprises a kiln body and a poking element, and the poking element is arranged on the inner wall of the kiln body. In the axial direction of the kiln body, the kiln body is sequentially divided into three treatment sections, and the working temperature of the middle treatment section is the highest. The inner wall of each treatment section is provided with the poking element. A projection plane λ perpendicular to the axial direction of the kiln body is set, and the normal projections of the poking elements of adjacent treatment sections on the projection plane λ are staggered with each other. The second treatment section is located in the middle position, and the treatment sections on both sides have a certain heat preservation effect on the second treatment section, so that the working temperature in the second treatment section can be kept at a set higher temperature. In the process that the material falls from the top to the bottom, the material is fully contacted with the flame, so that the material can be fully combusted, and the combustion efficiency and the heating efficiency of the material are improved. Meanwhile, impurities can be more easily separated. The poking elements in adjacent treatment sections are staggered, and the materials in adjacent treatment sections will not affect each other.

Description

Technical Field

[0001] This application relates to the field of smelting waste slag treatment technology, and in particular to a rotary kiln and smelting waste slag treatment equipment. Background Technology

[0002] In smelting production, smelting slag is generated, which is a type of industrial solid waste. With the development of production, the amount of solid waste is increasing year by year, and the treatment of solid waste is an urgent problem to be solved. In the existing technology, solid waste is treated by combustion in a rotary kiln. However, the control of the maximum treatment temperature in the rotary kiln is poor and cannot be maintained well, which reduces the treatment efficiency and quality. In addition, solid waste tends to accumulate at the bottom of the rotary kiln, resulting in incomplete and uneven combustion, excessively long combustion time, and difficulty in removing impurities from the material.

[0003] Therefore, improvements to existing technologies are necessary. Utility Model Content

[0004] This application aims to solve at least one of the technical problems existing in the prior art, and to provide a rotary kiln and smelting slag treatment equipment.

[0005] According to one aspect of this application, a rotary kiln is provided, including a kiln body and a feeding device, the feeding device being disposed on the inner wall of the kiln body; the kiln body is divided into three processing sections along the axial direction of the kiln body, with the middle processing section having the highest operating temperature; the feeding device is provided on the inner wall of each processing section, and a projection plane λ perpendicular to the axial direction of the kiln body is set, with the orthographic projections of the feeding devices of adjacent processing sections intersecting each other on the projection plane λ.

[0006] In one embodiment, the material further includes refractory bricks laid on the inner wall of the processing section, and the feeding member is embedded in the refractory bricks.

[0007] In one embodiment, the feeding member has an angled mounting portion for feeding, the mounting portion being connected to the inner wall of the processing section, and the angle between the mounting portion and the feeding portion being α, satisfying: 75°≤α≤90°.

[0008] In one embodiment, the three processing sections are sequentially referred to as the first processing section, the second processing section, and the third processing section along the axial direction of the kiln body. The working temperature of the second processing section is greater than that of the third processing section, and the working temperature of the third processing section is greater than that of the first processing section.

[0009] The peripheral wall of the first processing section has an opening, which is configured for material to enter or exit.

[0010] In one embodiment, the kiln body is set at an angle to the horizontal plane η, the height of the third processing section is higher than the height of the first processing section, and the angle between the kiln body and the horizontal plane η is β, satisfying: 2°≤β≤5°.

[0011] In one embodiment, the feeding member disposed in the first processing section is inclined along the axial direction of the kiln body, and the two ends of the feeding member are a first end and a second end, with the second end close to the second processing section; the height of the second end is lower than the height of the first end.

[0012] In one embodiment, the system further includes an air intake, which is provided on the sidewall of each of the processing sections; the air intake and the opening are circumferentially spaced in the first processing section.

[0013] In one embodiment, the air intake is detachably connected to the processing section.

[0014] In one embodiment, in each of the processing sections, four feeding members are provided at circumferential intervals along the processing section.

[0015] According to another aspect of this application, a slag treatment device is provided, comprising any of the rotary kilns described above.

[0016] The beneficial effects of this application are as follows: Dividing the kiln body axially into multiple processing sections with different working temperatures allows for the segmented processing of various material components in the smelting slag, which is beneficial for improving the processing quality of materials inside the furnace and shortening the smelting time; the second processing section is located in the middle, and the processing sections on both sides have a certain heat preservation effect on the second processing section, which can ensure that the working temperature in the second processing section is at a set higher temperature, and avoid the external influence on the working temperature of the second processing section, which would cause the working temperature in the second processing section to drop; during the rotation of the kiln body, the feeding component transfers the material at the bottom of the kiln body to the top of the kiln body, and the material gradually falls back to the bottom of the kiln body under the action of gravity. During the process of the material falling from the top to the bottom, the material comes into full contact with the flame, and the material is fully burned, which improves the combustion efficiency and heating efficiency of the material; at the same time, the material is subjected to centrifugal force, and during the process of the material falling from the top to the bottom of the kiln body, impurities are more easily separated, which improves the efficiency of impurity separation and is beneficial for improving the purity of the material obtained after smelting; the feeding components in adjacent processing sections are arranged in an alternating manner, so that the material in adjacent processing sections is not in the falling process, that is, the material in adjacent processing sections will not affect each other. Attached Figure Description

[0017] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a rotary kiln provided in an embodiment of this application.

[0019] Figure 2 yes Figure 1 Side view.

[0020] Figure 3 yes Figure 1 The front view.

[0021] Figure 4 yes Figure 3 Sectional view at point AA.

[0022] Figure 5 This is a schematic diagram of a material feeding plate provided in an embodiment of this application.

[0023] Figure 6 This is another schematic diagram of a material feeding plate provided in an embodiment of this application.

[0024] Figure 7 This is a schematic diagram of a tilting feed plate provided in an embodiment of this application.

[0025] In the picture:

[0026] 10. Rotary kiln; 11. Kiln body; 111. Processing section; 1111. First processing section; 1112. Second processing section; 1113. Third processing section; 12. Feeding component; 121. Mounting part; 122. Feeding part; 13. Refractory brick; 14. Opening; 15. Air inlet component;

[0027] 20. First end;

[0028] 30. The second end;

[0029] 40. Driver components;

[0030] 50. Materials. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0033] The rotary kiln and smelting slag treatment equipment of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] In existing technologies, the control of the maximum processing temperature inside the rotary kiln is poor and cannot be maintained well, which reduces the processing efficiency and quality. Furthermore, solid waste tends to accumulate at the bottom of the rotary kiln, resulting in incomplete and uneven combustion of materials, excessively long combustion time, and difficulty in removing material impurities.

[0035] To address the aforementioned technical problems, this application provides a rotary kiln, including a kiln body and a feeding device, the feeding device being disposed on the inner wall of the kiln body; the kiln body is sequentially divided into three processing sections along its axial direction, with the middle processing section having the highest operating temperature; the feeding device is provided on the inner wall of each processing section, and a projection plane λ perpendicular to the axial direction of the kiln body is defined, with the orthographic projections of the feeding devices in adjacent processing sections intersecting each other on the projection plane λ. This will be described in detail below.

[0036] See Figure 1-4 The rotary kiln 10 includes a kiln body 11 and a feeding element 12. The feeding element 12 is disposed on the inner wall of the kiln body 11. Along the axial direction of the kiln body 11, the kiln body 11 is divided into three processing sections 111 in sequence, with the middle processing section 111 having the highest working temperature. The inner wall of each processing section 111 is provided with a feeding element 12, and a projection plane λ is set perpendicular to the axial direction of the kiln body 11. The orthographic projections of the feeding elements 12 of adjacent processing sections 111 on the projection plane λ are intersected.

[0037] The following embodiments use a rotary kiln 10 to process smelting waste slag as an example. In some embodiments, the rotary kiln 10 can also process other materials 50, and is not limited to this.

[0038] The slag from smelting contains complex substances with different reaction temperatures. When the furnace is at the same temperature, multiple substances are processed simultaneously, which can cause interference and affect the final processing effect. This application divides the kiln body 11 along the axial direction into multiple processing sections 111 with different working temperatures. This allows for the segmented processing of various substances in the slag (different components are processed at different working temperatures), which is beneficial for improving the processing quality of substances in the furnace and shortening the smelting time.

[0039] For ease of explanation, the three processing sections 111 along the axial direction of the kiln body 11 are, in sequence, the first processing section 1111, the second processing section 1112, and the third processing section 1113. The second processing section 1112 has the highest operating temperature (higher than the operating temperatures in the first and third processing sections 1111 and 1113). The second processing section 1112 is located in the middle, and the processing sections 111 on either side (the first and third processing sections 1111 and 1113) provide some insulation for it, ensuring that the operating temperature within the second processing section 1112 remains at a relatively high set temperature, preventing external [temperature fluctuations]. The boundary affects the working temperature of the second processing section 1112, causing the working temperature within the second processing section 1112 to decrease. When the working temperature in the first processing section 1111 is the highest, the temperature difference between the side of the first processing section 1111 away from the second processing section 1112 (external space) and the temperature inside the first processing section 1111 is too large, which easily causes heat loss within the first processing section 1111, lowering the temperature and making it difficult to maintain the high temperature within the first processing section 1111. Therefore, the working temperature in the second processing section 1112 is the highest, which is conducive to temperature maintenance, improving the processing quality of materials in the furnace, and shortening the smelting time.

[0040] In this embodiment, each processing section 111 is equipped with a material feeding component 12. During the rotation of the kiln body 11 (each processing section 111), the material feeding component 12 transfers the material 50 at the bottom of the kiln body 11 to the top of the kiln body 11. Under the action of gravity, the material 50 gradually falls back to the bottom of the kiln body 11. During the process of the material 50 falling from the top to the bottom, the material 50 comes into full contact with the flame, and the material 50 is fully burned, which improves the combustion efficiency and heating efficiency of the material 50, while shortening the smelting time of the material 50 and reducing the smelting cost.

[0041] It is worth mentioning that, due to the rotation of the kiln body 11, the material 50 will be subjected to centrifugal force. As the material 50 falls from the top of the kiln body 11 to the bottom, impurities will be more easily separated, which improves the efficiency of impurity separation and helps to improve the purity of the material obtained after smelting.

[0042] Additionally, when the material 50 in a processing section 111 is falling from the top to the bottom of the kiln body 11, the feeding components 12 in adjacent processing sections 111 are staggered (e.g., Figure 2 As shown in the figure, the material feeding components 12a and 12b are interleaved, so that the material 50 in the adjacent processing section 111 is not in the falling process, that is, the material 50 in the adjacent processing section 111 will not affect each other, which is beneficial to improving the purity of the material obtained after smelting.

[0043] It is worth mentioning that the kiln body 11 rotates under the drive of the drive assembly 40. The specific structure of the drive assembly 40 is not specifically limited here, as long as it can meet the requirements for the rotation of the kiln body 11.

[0044] In some embodiments, the rotary kiln 10 further includes refractory bricks 13, which are laid on the inner wall of the processing section 111, and the feeding member 12 is embedded in the refractory bricks 13.

[0045] The refractory bricks 13 protect the kiln body 11 and extend its service life. Meanwhile, since the material feeding component 12 is installed on the inner wall of the kiln body 11 (processing section 111) and embedded in the refractory bricks 13, the refractory bricks 13 can cover the connection between the material feeding component 12 and the kiln body 11, preventing the connection between the material feeding component 12 and the kiln body 11 from directly contacting the flame, thus improving the stability of the material feeding component 12 installed on the kiln body 11.

[0046] In some embodiments, the feeding member 12 has an angled mounting portion 121 and a feeding portion 122. The mounting portion 121 is connected to the inner wall of the processing section 111. The angle between the mounting portion 121 and the feeding portion 122 is α, which satisfies: 75°≤α≤90°, such as 75°, 78°, 81°, 84°, 87°, 90°, etc.

[0047] By connecting the mounting part 121 to the inner wall of the processing section 111, the contact area between the material feeding component 12 and the inner wall of the processing section 111 is increased, which helps to improve the stability of the installation of the material feeding component 12 on the inner wall of the processing section 111.

[0048] When the value of α is less than 75°, the distance between the feeding part 122 and the mounting part 121 (inner wall of the processing section 111) is relatively close, that is, the end of the feeding part 122 away from the mounting part 121 is close to the inner wall of the processing section 111. During the rotation of the feeding part 122 with the rotary kiln 10, the feeding effect is poor, and the material 50 fed by the feeding part 122 is easily on the left side (e.g., Figure 5As shown, the material 50 is piled up to the left, meaning that the material 50 does not pass through the center of the kiln body 11 during its fall, and the material 50 cannot make good contact with the flame. If it is necessary to move the material 50 to the middle of the processing section 111, the material-moving part 122 needs to be extended, which increases the material usage cost, and the extended material-moving part 122 has poor rigidity.

[0049] When the value of α is greater than 90°, the feeding section 122 needs to bring the material 50 to a very high position before the material 50 can fall again, which easily causes the material 50 to accumulate to the right (e.g., Figure 6 As shown, the material 50 is far from the center of the kiln body 11 (the center position allows the material 50 to fully contact the flame), which is not conducive to the full combustion of the material 50. In addition, the material 50 is brought to a higher position, and the greater the gravitational potential energy brought by the material 50, the stronger the driving force is required to drive the rotary kiln 10 to rotate, which is not conducive to reducing production costs.

[0050] Therefore, when the value of α is 75°≤α≤90°, it can ensure that the material 50 is in full contact with the flame during the process of falling again after being moved (the falling material 50 passes through the center position of the kiln body 11), thereby improving the combustion efficiency and heating efficiency of the material 50. It can also reduce the use of materials, ensure the rigidity of the feeding part 122, and help extend the service life of the feeding part 12.

[0051] It should be noted that the material feeder 12 can be a one-piece part made by bending or a one-piece part made by welding two steel plates; no specific limitation is made here.

[0052] In some embodiments, the three processing sections 111 are sequentially referred to as the first processing section 1111, the second processing section 1112, and the third processing section 1113 along the axial direction of the kiln body 11. The working temperature of the second processing section 1112 is higher than that of the third processing section 1113, and the working temperature of the third processing section 1113 is higher than that of the first processing section 1111. The peripheral wall of the first processing section 1111 is provided with an opening 14, which is configured to allow material 50 to enter or exit.

[0053] The first processing section 1111 has the lowest operating temperature. In the actual smelting process, the smelting waste slag (material 50) is first put into the first processing section 1111 with a lower operating temperature. The components that can be processed at this temperature are processed first. At the same time, the remaining waste slag is preheated. Then, the preheated waste slag is transported to the second processing section 1112 with the highest temperature for further processing. This is beneficial to improving the processing quality of materials in the furnace. The preheating effect of the first processing section 1111 with a lower operating temperature can also reduce smelting time and reduce smelting costs.

[0054] It is worth mentioning that during the actual smelting process, some material 50 will enter the third processing section 1113 from the second processing section 1112. The material 50 is processed at the working temperature of the third processing section 1113. This allows the material 50 to be processed in processing sections 111 at different working temperatures, which is beneficial to improving the processing quality of materials in the furnace.

[0055] See Figure 3 The kiln body 11 is set at an angle to the horizontal plane η. The height of the third processing section 1113 is higher than the height of the first processing section 1111. The angle between the kiln body 11 and the horizontal plane η is β, which satisfies: 2°≤β≤5°, such as 2°, 3°, 4°, 5°, etc.

[0056] The opening 14 is located on the peripheral wall of the first processing section 1111. The height of the first processing section 1111 is lower than the height of the third processing section 1113. That is, the kiln body 11 is set at an inclination. After the smelting process is completed, the inclination of the kiln body 11 is conducive to the slag being poured out from the opening 14, thereby improving the smelting efficiency.

[0057] When β is less than 2°, the inclination of the kiln body 11 is small, resulting in a smaller guiding effect on the material 50 (residue). When β is greater than 5°, the inclination of the kiln body 11 is large. During the smelting of material 50, for example, when material 50 is burned in the second processing section 1112 (which needs to be processed at the working temperature of the second processing section 1112), as the kiln body 11 rotates, due to the large inclination of the kiln body 11, material 50 is more easily transported to the first processing section 1111 under the action of gravity. However, the working temperature of the first processing section 1111 is lower than that of the second processing section 1112, which affects the smelting and processing of material 50. In other words, the large inclination of the kiln body 11 is not conducive to the full processing of material 50 and affects the processing quality of material 50 in the furnace.

[0058] See Figure 7 The material feeding component 12, which is installed in the first processing section 1111, is inclined along the axial direction of the kiln body 11. The two ends of the material feeding component 12 are a first end 20 and a second end 30. The second end 30 is close to the second processing section 1112. The height of the second end 30 is lower than the height of the first end 20.

[0059] In this embodiment, the feeding plate 12 is set in an inclined state, that is, during the rotation of the kiln body 11, the material 50 will be gradually conveyed from the first processing section 1111 to the second processing section 1112 for processing; specifically, when the material 50 enters the first processing section 1111, as the feeding plate 12 in the first processing section 1111 rotates, it can fully contact the flame, can be quickly preheated, and undergo preliminary processing; at the same time, due to the inclined setting of the feeding plate, the material 50 will be gradually conveyed to the second processing section 1112 for high-temperature smelting.

[0060] It should be noted that the preheating and pretreatment of material 50 in the first processing section 1111 is carried out synchronously with the operation of conveying material 50 from the first processing section 1111 to the second processing section 1112; the feeding component 12 is inclined, that is, the feeding component 12 is inclined relative to the horizontal plane η.

[0061] In some embodiments, the rotary kiln 10 further includes an air inlet 15, and each processing section 111 has an air inlet 15 on its sidewall; the air inlet 15 and the opening 14 disposed in the first processing section 1111 are circumferentially spaced apart in the first processing section 1111.

[0062] The air inlet 15 and the opening 14 on the first processing section 1111 are spaced apart. In this embodiment, the central angle of the part of the side wall of the first processing section 1111 located between the two (air inlet 15 and opening 14) is 90° (in some embodiments, other angles may be set, depending on the diameter of the kiln body 11, etc.). When air needs to be introduced, the kiln body 11 is rotated until the air inlet 15 is above the kiln body 11. At this time, the opening 14 faces the side of the kiln body 11 and can be used as an observation window to facilitate personnel to detect and observe the reaction of the internal material 50 in real time.

[0063] It should be noted that in some embodiments, hydrogen is supplied to the rotary kiln 10 through the air inlet 15. The strong reducing properties of hydrogen at high temperatures are used to reduce metal ions or other ions into pure metals to form alloys. Specifically, under high-temperature conditions, hydrogen reacts with metal oxides or other compounds to generate the desired elemental metal, as well as compounds such as silicon carbide, silicon dioxide, and sodium silicate. In some embodiments, other gases may also be supplied, depending on the reaction inside the furnace.

[0064] It is worth mentioning that when gas needs to be introduced into the furnace, the gas inlet 15 is rotated to the top of the kiln body 11, that is, the gas inlet pipe is laid above the rotary kiln 10, which will not interfere with the arrangement and installation of other components of the rotary kiln 10. Moreover, being located above, even if there is a hydrogen leak during hydrogen addition (introducing hydrogen into the rotary kiln 10), it will be above the rotary kiln 10, which is beneficial to improving the safety of use.

[0065] In some embodiments, the air intake 15 is detachably connected to the processing section 111.

[0066] The air intake component 15 is detachable, and different air intake components 15 can be replaced according to different materials 50, such as replacing the air intake component 15 with different air intake volumes, which can be flexibly adapted to actual production; at the same time, it is convenient for the maintenance and repair of the air intake component 15 in the later stage, and is easy to use.

[0067] In some embodiments, in each processing section 111, four feeding members 12 are provided at circumferential intervals along the processing section 111.

[0068] This can prevent material 50 from accumulating for a long time. The kiln body 11 can move the material 50 four times in one revolution, which is conducive to improving combustion efficiency, improving the processing quality of materials in the furnace, and shortening the smelting time.

[0069] It should be noted that in some embodiments, three feeding components 12 may be provided on the same processing section 111, and it is not limited to this.

[0070] On the other hand, this application also relates to a smelting slag treatment device, including any of the aforementioned rotary kilns 10.

[0071] Using the technical solution provided in this application embodiment, the kiln body 11 is divided into multiple processing sections 111 with different working temperatures along the axial direction. This allows for the segmented processing of various material components in the smelting slag, which is beneficial for improving the processing quality of materials inside the furnace and shortening the smelting time. The second processing section 1112 is located in the middle, and the processing sections 111 on both sides have a certain heat preservation effect on the second processing section 1112, which can ensure that the working temperature in the second processing section 1112 is at a set high temperature, and prevent the external environment from affecting the working temperature of the second processing section 1112 and causing the working temperature inside the second processing section 1112 to drop. During the rotation of the kiln body 11, the feeding component 12 rotates the material 50 times at the bottom of the kiln body 11. As the material 50 is moved above the kiln body 11, it gradually falls back to the bottom of the kiln body 11 under the action of gravity. During the process of falling from the top to the bottom, the material 50 comes into full contact with the flame, allowing it to burn completely and improving the combustion and heating efficiency. At the same time, the material 50 is subjected to centrifugal force, which makes it easier to separate impurities during the fall from the top to the bottom of the kiln body 11, improving the efficiency of impurity separation and helping to improve the purity of the smelted material. The material feeding components 12 in adjacent processing sections 111 are staggered, so that the material 50 in adjacent processing sections 111 is not in the process of falling, that is, the material 50 in adjacent processing sections 111 will not affect each other.

[0072] In the various embodiments of this application, unless otherwise specified or logically conflicting, the terminology or descriptions between different embodiments are consistent and can be referenced mutually. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships. In this application, "at least one" means one or more, and "more than one" means two or more.

[0073] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The order of the process numbers described above does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

[0074] The rotary kiln and smelting slag treatment equipment provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand this application and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A rotary kiln characterized by, It includes a kiln body and a feeding device, wherein the feeding device is disposed on the inner wall of the kiln body; Along the axial direction of the kiln body, the kiln body is divided into three processing sections in sequence, with the middle processing section having the highest operating temperature; Each of the processing sections has a material feeding component on its inner wall, and a projection plane λ perpendicular to the kiln body axis is set. The orthographic projections of the material feeding components of adjacent processing sections on the projection plane λ are intersected.

2. The rotary kiln as described in claim 1, characterized in that, It also includes refractory bricks, which are laid on the inner wall of the processing section, and the feeding component is embedded in the refractory bricks.

3. The rotary kiln as described in claim 1, characterized in that, The feeding component has an angled mounting portion and a feeding portion. The mounting portion is connected to the inner wall of the processing section. The angle between the mounting portion and the feeding portion is α, which satisfies: 75°≤α≤90°.

4. The rotary kiln as described in claim 1, characterized in that, The three processing sections are sequentially referred to as the first processing section, the second processing section, and the third processing section along the axial direction of the kiln body. The working temperature of the second processing section is greater than that of the third processing section, and the working temperature of the third processing section is greater than that of the first processing section. The peripheral wall of the first processing section has an opening, which is configured for material to enter or exit.

5. The rotary kiln as described in claim 4, characterized in that, The kiln body is set at an angle to the horizontal plane η, the height of the third processing section is higher than the height of the first processing section, and the angle between the kiln body and the horizontal plane η is β, which satisfies: 2°≤β≤5°.

6. The rotary kiln as described in claim 5, characterized in that, The material feeding member disposed in the first processing section is inclined along the axial direction of the kiln body. The two ends of the material feeding member are a first end and a second end, with the second end close to the second processing section. The height of the second end is lower than the height of the first end.

7. The rotary kiln as described in claim 4, characterized in that, It also includes an air intake component, and the sidewall of each of the processing sections is provided with the air intake component; The air intake and the opening are arranged circumferentially in the first processing section.

8. The rotary kiln as described in claim 7, characterized in that, The air intake component is detachably connected to the processing section.

9. The rotary kiln as described in claim 1, characterized in that, In each of the processing sections, four feeding components are provided at circumferential intervals along the processing section.

10. A smelting slag treatment apparatus, characterized by, Includes the rotary kiln as described in any one of claims 1 to 9.

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