Electromagnetic induction heating acid regeneration spray roasting furnace

Abstract

The invention belongs to the technical field of steel production and processing, and discloses an electromagnetic induction heating acid regeneration spray roasting furnace which comprises a roasting furnace body, a furnace cavity is formed in the roasting furnace body, and an induction coil used for increasing the temperature in the furnace cavity is arranged on the roasting furnace body; a waste acid input pipeline communicated with the pickling line is arranged at the upper part of the furnace chamber, a plurality of spray guns for spraying waste acid downwards are mounted on the waste acid input pipeline, an oxygen input pipeline is arranged at the lower part of the furnace chamber, and the oxygen input pipeline is communicated with a pure oxygen storage tank or an oxygen-enriched gas storage tank; and a flue gas discharge pipeline is arranged on the top surface of the roasting furnace body. The induction coil is used for heating the furnace chamber of the roasting furnace body, so that the temperature in the furnace is uniformly distributed, the heating efficiency is improved, the energy consumption is reduced, waste acid is quickly atomized and fully reacts with input pure oxygen or oxygen-enriched gas, the reaction speed and efficiency are improved, and the emission of acid gas and dust in flue gas is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel production and processing, and particularly relates to an electromagnetic induction heating acid regeneration spray roasting furnace. Background Art

[0002] In the process of steel production, pickling is an indispensable process for removing scale and rust on the surface of steel. However, a large amount of waste acid is generated during the pickling process. This waste acid not only contains a large amount of iron ions but also other impurities such as chloride ions and sulfate ions. Directly discharging this waste acid will cause serious environmental pollution. Therefore, acid regeneration technology has emerged.

[0003] Traditional acid regeneration methods mainly use the spray roasting method for regeneration. After the pickling waste liquid undergoes a chemical reaction in the roasting furnace, the iron ions in the pickling waste liquid are oxidized to iron oxide, and at the same time, acidic flue gas is generated. The acidic flue gas then enters the absorption tower through a Venturi scrubber, and the absorption tower absorbs the acidic gas to generate regenerated acid. However, traditional roasting furnaces have some problems, such as high energy consumption and serious environmental pollution. Summary of the Invention

[0004] The purpose of the present invention is to provide an electromagnetic induction heating acid regeneration spray roasting furnace to solve the above problems existing in the prior art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: An electromagnetic induction heating acid regeneration spray roasting furnace includes a roasting furnace body. A furnace cavity is provided inside the roasting furnace body, and an induction coil for increasing the temperature inside the furnace cavity is provided on the roasting furnace body. A waste acid input pipe communicating with the pickling line is provided at the upper part of the furnace cavity, and a plurality of spray guns for spraying waste acid downward are installed on the waste acid input pipe. An oxygen input pipe is provided at the lower part of the furnace cavity, and the oxygen input pipe is communicated with a pure oxygen storage tank or an oxygen-enriched gas storage tank. A flue gas discharge pipe is provided on the top surface of the roasting furnace body.

[0006] As a preferred technical solution in the present invention, the roasting furnace body includes a roasting furnace main body with an open upper end and a roasting furnace upper cover buckled on the upper end of the roasting furnace main body. The flue gas discharge pipe is provided on the roasting furnace upper cover. An annular groove is opened at the upper end of the roasting furnace main body. The roasting furnace body further includes a heat conduction ring provided in the annular groove, and the induction coil is provided in the annular groove outside the heat conduction ring. The waste acid input pipe is installed inside the roasting furnace upper cover.

[0007] As a preferred technical solution in the present invention, a limiting ring that abuts against the inner wall of the annular groove is provided at the lower end of the heat-conducting ring, and the induction coil is arranged on the limiting ring; the outer diameter of the upper end of the heat-conducting ring is a frustum of a cone that gradually increases from top to bottom, and an annular positioning groove is formed by the cooperation between the frustum of a cone and the main body of the roasting furnace. A central annular positioning block is provided at the lower end of the upper cover of the roasting furnace, and the annular positioning block is matched and arranged in the annular positioning groove. The bottom surfaces of the upper cover of the roasting furnace on both sides of the annular positioning block are respectively in close contact with the upper end surface of the main body of the roasting furnace and the upper end surface of the heat-conducting ring.

[0008] As a preferred technical solution in the present invention, a spiral stirring blade located between the spray gun and the oxygen input pipe is arranged in the heat-conducting ring. A rotating motor is fixed in the middle of the top surface of the upper cover of the roasting furnace, and the rotating motor is connected to the central axis of the spiral stirring blade; the waste acid input pipe includes a plurality of annular pipes arranged coaxially and all sleeved outside the central axis, and adjacent annular pipes are communicated through connecting pipes. A plurality of spray guns are installed at the lower end of each annular pipe.

[0009] As a preferred technical solution in the present invention, the main body of the roasting furnace is a conical blanking port with an opening that gradually becomes smaller from top to bottom. A limiting ring is rotatably connected to the inner wall at the lower end of the conical blanking port. The limiting ring includes a plurality of limiting balls. The middle parts of all the limiting balls are penetrated by a circular connecting ring, and all the limiting balls are evenly distributed on the circular connecting ring. An arc-shaped limiting member sleeved outside the circular connecting ring is abutted between any two adjacent limiting balls; an annular limiting groove is arranged on the inner wall at the lower end of the conical blanking port, and one side of all the limiting balls is matched and arranged in the annular limiting groove. The lower part of the central axis penetrates the conical blanking port, and the other side of all the limiting balls is in contact with or has a clearance fit with the central axis.

[0010] As a preferred technical solution in the present invention, a grinding ring sleeved outside the central axis is rotatably connected below the discharge port of the conical blanking port. A grinding gap is arranged between the grinding ring and the central axis, and the grinding gap gradually becomes smaller from top to bottom; a driving motor is installed at the lower end of the conical blanking port, a driving gear is installed on the motor shaft of the driving motor, and a passively meshing tooth distributed in a ring shape is arranged on the outer wall of the grinding ring, and the passively meshing tooth meshes with the driving gear.

[0011] As a preferred technical solution in the present invention, the lower part of the conical blanking port is a vertically extending part, and an annular installation groove is arranged on the outer wall of the vertically extending part. An annular installation plate is rotatably connected in the annular installation groove, and the edge of the annular installation plate extends outside the annular installation groove; a plurality of screw rods are fixed at the edge of the upper end of the grinding ring, each screw rod penetrates the annular installation plate, and a plurality of locking nuts are abutted against the upper end of the edge of the annular installation plate, and each locking nut is threadedly connected to a screw rod.

[0012] As a preferred technical solution in the present invention, an annular stepped platform that is recessed outward is provided on the inner wall at the lower end of the conical blanking port. An annular boss is provided in the middle of the upper end of the grinding ring, and the annular boss is fitted in the annular stepped platform. One side of each limiting ball is fixedly connected to the annular boss.

[0013] As a preferred technical solution in the present invention, a material receiving bucket is provided below the grinding ring. A plurality of ball bearings are embedded in the upper end of the material receiving bucket, and each ball bearing is in rolling contact with the bottom surface of the grinding ring.

[0014] As a preferred technical solution in the present invention, a sealing cavity is provided on the inner top surface of the upper cover of the roasting furnace. A ball bearing is installed in the sealing cavity. The outer ring of the ball bearing is connected to the sealing cavity, and the inner ring of the ball bearing is in contact with the central shaft.

[0015] Beneficial effects: The present invention heats the furnace cavity of the roasting furnace body through the induction coil, so that the temperature in the furnace is evenly distributed, improving the heating efficiency and reducing energy consumption. The waste acid entering the roasting furnace body is quickly atomized under the heating effect of the induction coil to form a misty waste acid, ensuring the contact area with pure oxygen or oxygen-rich gas, and then fully reacting with the pure oxygen or oxygen-rich gas input into the furnace cavity, improving the reaction speed and efficiency, reducing the emission of acidic gases and dust in the flue gas. The treated flue gas can be transported through the flue gas discharge pipe to the subsequent flue gas treatment equipment, and regenerated acid is generated in the absorption tower for recycling in the pickling line. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional structure diagram of the present invention; Figure 2 is Figure 1 an enlarged schematic view of part A in Figure 3 is a cross-sectional view of the limiting ring in the present invention.

[0017] In the figure: 1-roasting furnace body; 101-roasting furnace main body; 1011-conical blanking port; 102-roasting furnace upper cover; 1021-sealing cavity; 103-thermal conduction ring; 2-induction coil; 3-waste acid input pipe; 4-spray gun; 5-oxygen input pipe; 6-spiral stirring blade; 601-central shaft; 7-rotating motor; 8-limiting ring; 801-limiting ball; 802-circular connecting ring; 803-arc-shaped limiting member; 9-grinding ring; 901-annular boss; 10-driving motor; 11-driving gear; 12-annular mounting plate; 13-screw rod; 14-lock nut; 15-material receiving bucket; 16-ball bearing; 17-ball bearing. DETAILED DESCRIPTION OF THE INVENTION

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention. Embodiment

[0019] As Figure 1 , Figure 2 and Figure 3 shown, this embodiment provides an electromagnetic induction heating acid regeneration spray roasting furnace, which includes a roasting furnace body 1. A furnace cavity is arranged inside the roasting furnace body 1. An induction coil 2 for increasing the temperature inside the furnace cavity is arranged on the roasting furnace body 1. After the induction coil 2 is powered on, the induction coil 2 can raise the temperature inside the furnace cavity. By heating the furnace cavity through the induction coil 2, the temperature inside the furnace can be evenly distributed, the heating efficiency can be improved, and the energy consumption can be reduced; a waste acid input pipe 3 communicating with the pickling line is arranged at the upper part of the furnace cavity. A plurality of spray guns 4 for spraying waste acid downward are installed on the waste acid input pipe 3. In practice, the waste acid from the pickling line can be sent into the furnace cavity of the roasting furnace body 1 through a waste acid pump, and then evenly sprayed in the furnace cavity through the spray guns 4. The waste acid is rapidly atomized under the heating effect of the induction coil 2 to form a misty waste acid. An oxygen input pipe 5 is arranged at the lower part of the furnace cavity. The oxygen input pipe 5 is communicated with a pure oxygen storage tank or a rich oxygen gas storage tank. Then, pure oxygen or rich oxygen gas is sent into the furnace cavity through the pipe as a reaction gas, so that the misty waste acid can fully contact with the oxygen, improving the reaction speed and efficiency; a flue gas discharge pipe is arranged on the top surface of the roasting furnace body 1, which is connected to subsequent flue gas treatment equipment, and regenerated acid is generated in the absorption tower for recycling by the pickling line to treat the flue gas generated in the furnace cavity, removing the acidic gas and dust therein, and reducing environmental pollution.

[0020] The present invention heats the furnace cavity of the roasting furnace body 1 through the induction coil 2 to make the temperature inside the furnace evenly distributed, improve the heating efficiency, and reduce the energy consumption. The waste acid entering the roasting furnace body 1 is rapidly atomized under the heating effect of the induction coil 2 to form a misty waste acid, ensuring the contact area with pure oxygen or rich oxygen gas, and then fully reacting with the pure oxygen or rich oxygen gas input into the furnace cavity, improving the reaction speed and efficiency, reducing the emission of acidic gas and dust in the flue gas. The treated flue gas can be transported through the flue gas discharge pipe to subsequent flue gas treatment equipment, and regenerated acid is generated in the absorption tower for recycling by the pickling line.

[0021] It should be noted that the oxygen input pipeline 5 can be arranged by opening an annular installation groove on the inner wall of the lower part of the furnace cavity, embedding the oxygen input pipeline 5 in the annular installation groove, arranging a gas transmission pipeline on one side of the oxygen input pipeline 5 that penetrates to the outside of the roasting furnace body 1, and opening a plurality of air outlets on the side of the oxygen input pipeline 5 facing the inside of the furnace cavity, so as to realize the injection of oxygen or oxygen-enriched gas. It can also be to open an annular cavity in the inner wall of the lower part of the furnace cavity, arrange a gas transmission pipeline on one side of the annular cavity that penetrates to the outside of the roasting furnace body 1, and open a plurality of air outlets on the side of the annular cavity facing the inside of the furnace cavity, so as to realize the injection of oxygen or oxygen-enriched gas. It can also be in the simplest way, such as installing an air diffuser pipe at the lower part of the furnace cavity, arranging a gas transmission pipeline on one side of the air diffuser pipe that penetrates to the outside of the roasting furnace body 1, so as to realize the injection of oxygen or oxygen-enriched gas. It can be set according to the actual situation without specific restrictions.

[0022] As a preferred implementation in this embodiment, it should be further noted that the roasting furnace body 1 includes a roasting furnace main body 101 with an open upper end and a roasting furnace upper cover 102 buckled on the upper end of the roasting furnace main body 101 to ensure the sealing between the two. At the same time, according to the actual situation, there can also be other connection methods between the two, such as threaded connection, bolt connection, etc., without specific restrictions, and it can be set according to the actual situation. The support feet are arranged at the lower end of the roasting furnace main body 101, and the flue gas discharge pipeline (not shown in the figure) is arranged on the roasting furnace upper cover 102; an annular groove is opened at the upper end of the roasting furnace main body 101, and the roasting furnace body 1 further includes a heat conduction ring 103 arranged in the annular groove, so that the furnace cavity for the reaction is located inside the heat conduction ring 103, and the induction coil 2 is arranged in the annular groove outside the heat conduction ring 103. In this way, the materials of the roasting furnace main body 101 and the roasting furnace upper cover 102 can be selected as materials that are not easy to conduct heat, so that the overall outer surface temperature will not be too high, thus avoiding safety hazards such as scalding. And the induction coil 2 can quickly heat the heat conduction ring 103, so that the temperature inside the furnace cavity rises to prepare for the reaction; the waste acid input pipeline 3 is installed inside the roasting furnace upper cover 102, so that the waste acid input pipeline 3 does not directly contact the heat conduction ring 103. Similarly, the oxygen input pipeline 5 is arranged on the roasting furnace main body 101 below the heat conduction ring 103, as Figure 1 shown. Preferably, as Figure 1 shown, the roasting furnace upper cover 102 has a structure that is recessed upward inside, so that the roasting furnace upper cover 102 also has an inner cavity, which is convenient for installing some components, such as the waste acid input pipeline 3.

[0023] It should be noted that the cooperative installation method of the roasting furnace main body 101, the roasting furnace upper cover 102, the heat conduction ring 103 and the induction coil 2 can realize the overall loading and unloading operation, which is convenient for maintaining the equipment according to the situation in practice.

[0024] As a preferred implementation in this embodiment, it should be further noted that a limiting ring is provided at the lower end of the heat-conducting ring 103, which abuts against the inner wall of the annular groove, that is, the limiting ring abuts against the inner wall of the annular groove, while the heat-conducting ring 103 above the limiting ring does not contact the inner wall of the annular groove, thereby leaving an installation position for the induction coil 2 above the limiting ring, so as to facilitate the arrangement of the induction coil 2 outside the heat-conducting ring 103 on the limiting ring, and then the heat-conducting ring 103 can be directly heated through the induction coil 2; the outer diameter of the upper end of the heat-conducting ring 103 is a frustum of a cone that gradually increases from top to bottom. The frustum of the cone and the main body 101 of the roasting furnace cooperate to form an annular positioning groove, so that the opening of the annular positioning groove gradually becomes smaller from top to bottom. A central annular positioning block is provided at the lower end of the upper cover 102 of the roasting furnace. The annular positioning block is fitted in the annular positioning groove. The annular positioning block can enhance the seal to prevent the heat generated by the induction coil 2 from escaping, and at the same time improve the stability of the upper cover 102 of the roasting furnace. When installing the upper cover 102 of the roasting furnace, the annular positioning groove with an opening gradually becoming smaller from top to bottom can make the lower part of the annular positioning block enter the annular positioning groove more easily, and thus it is easier to achieve the quick positioning of the annular positioning block during installation, making the installation easier. The bottom surfaces of the upper cover 102 of the roasting furnace on both sides of the annular positioning block are respectively in close contact with the upper end surface of the main body 101 of the roasting furnace and the upper end surface of the heat-conducting ring 103, further ensuring the sealing performance and the structural stability.

[0025] It should be noted that the energization of the induction coil 2 can be set according to the actual situation. For example, an opening is made on the main body 101 of the roasting furnace to facilitate the external connection of the power supply to the induction coil 2.

[0026] As a preferred implementation in this embodiment, it should be further noted that a spiral stirring blade 6 is provided inside the heat-conducting ring 103 between the spray gun 4 and the oxygen input pipe 5. A rotating motor 7 is fixed in the middle of the top surface of the upper cover 102 of the roasting furnace. The rotating motor 7 is connected to the central axis 601 of the spiral stirring blade 6. In practice, the spiral stirring blade 6 can be driven by the rotating motor to rotate slowly. The atomized waste acid sprayed by the spray gun 4 and oxygen react in the channel of the spiral stirring blade 6. For example, the spiral stirring blade 6 conveys the atomized waste acid downward, makes full contact with oxygen and reacts, and then the flue gas slowly rises and is discharged from the flue gas discharge pipe, increasing the reaction time and making the reaction more complete. Here, it should be noted that the spiral stirring blade 6 can rotate forward or backward under the drive of the rotating motor 7 and be adjusted according to the actual situation; the waste acid input pipe 3 includes a plurality of annular pipes coaxially arranged and all sleeved outside the central axis 601. The adjacent annular pipes are connected by connecting pipes, so that all the annular pipes are communicated with each other, and only one of the annular pipes needs to be connected to the pickling line pipe. A plurality of spray guns 4 are installed at the lower end of each annular pipe, so that the spray guns 4 are evenly distributed as required.

[0027] It should be noted that the installation of the spiral stirring blade 6 is loaded and unloaded together with the upper cover 102 of the roasting furnace. A certain gap is reserved between the edge of the spiral stirring blade 6 and the heat conduction ring 103 to prevent the spiral stirring blade 6 from rubbing against the heat conduction ring 103 during rotation.

[0028] It should be noted that in order to ensure that the central axis 601 of the spiral stirring blade 6 is located at the center of the furnace cavity, the rotating motor 7 is preferably located in the middle of the upper end of the upper cover 102 of the roasting furnace. In this case, the flue gas discharge pipe is arranged on the side of the upper cover 102 of the roasting furnace that is convenient, that is, on one side of the rotating motor 7. Since the outlet is the only one, it does not affect the smooth exhaust. In order to further improve the smoothness of the exhaust, the inner top surface of the upper cover 102 of the roasting furnace can be set to be inclined, so that the inner top surface of the upper cover 102 of the roasting furnace forms an inclined surface, and the inner top surface of the upper cover 102 of the roasting furnace corresponding to the side of the flue gas discharge pipe is located at the highest point. This can make the discharge of the flue gas more smooth. Of course, this solution is only a preferred design method, and the final structure can be adjusted according to the actual situation. No specific limitation is made in this embodiment.

[0029] As a preferred implementation in this embodiment, it should be further explained that the main body 101 of the roasting furnace has a conical blanking port 1011 with an opening that gradually decreases from top to bottom, which is convenient for the blanking of the solid oxide generated after the reaction. A support foot is provided at the lower end of the roasting furnace body 1. While ensuring the stability of the roasting furnace body 1, the conical blanking port 1011 can be suspended. A limiting ring 8 is rotatably connected to the inner wall at the lower end of the conical blanking port 1011. The limiting ring 8 includes a plurality of limiting balls 801. The middle parts of all the limiting balls 801 are penetrated by a circular connecting ring 802. All the limiting balls 801 are evenly distributed on the circular connecting ring 802, and an arc-shaped limiting member 803 sleeved outside the circular connecting ring 802 is abutted between any two adjacent limiting balls 801 to ensure the distance between any two adjacent limiting balls 801, and further ensure the size of the blanking port. The size and quantity of the limiting balls 801 can be set according to the actual situation. An annular limiting groove is provided on the inner wall at the lower end of the conical blanking port 1011. One side of all the limiting balls 801 is matched and arranged in the annular limiting groove to ensure the flexibility of the limiting ring 8. The lower part of the central shaft 601 penetrates through the conical blanking port 1011, and the other side of all the limiting balls 801 abuts against or has a clearance fit with the central shaft 601. When the two are in abutment, the limiting balls 801 can enhance the stability of the central shaft 601. When the two have a clearance fit, it can make the limiting balls 801 and the central shaft 601 achieve a grinding effect for solid oxides with slightly larger particle sizes. Here, it should be noted that in practice, the material of the central shaft 601 can be set according to the actual situation. For example, the lower part of the central shaft 601 can be designed as a later-assembled structure, so as to facilitate the separate setting of the material of the lower part of the central shaft 601 for grinding in cooperation with the limiting balls 801.

[0030] As a preferred implementation in this embodiment, it should be further noted that a grinding ring 9 sleeved outside the central shaft 601 is rotatably connected below the discharge port of the conical blanking port 1011. A grinding gap is provided between the grinding ring 9 and the central shaft 601, and the grinding gap gradually becomes smaller from top to bottom, facilitating the easy dropping of the solid oxide into the grinding gap, and then easily crushing the solid oxide as the grinding gap changes, ensuring the grinding effect. Of course, the width of the uppermost end of the grinding gap should be greater than the gap at the discharge port of the conical blanking port 1011 to prevent the solid oxide from falling into the gap between the upper end of the grinding ring 9 and the lower end of the conical blanking port 1011, thereby generating a frictional force that hinders the rotation of the grinding ring 9; a driving motor 10 is installed at the lower end of the conical blanking port 1011. The driving motor 10 can be directly fixed on the roasting furnace main body 101 to ensure its stability. A driving gear 11 (preferably detachably connected here) is installed on the motor shaft of the driving motor 10. Passive meshing teeth are arranged in a circular distribution on the outer wall of the grinding ring 9, and the passive meshing teeth are meshed with the driving gear 11, so as to drive the driving gear 11 to rotate through the driving motor 10, and the driving gear 11 drives the grinding ring 9 to rotate, thereby controlling the reverse rotation of the grinding ring 9 and the central shaft 601 to achieve a better grinding effect.

[0031] It should be noted that preferably, a plurality of balls are embedded at the upper end of the grinding ring 9 outside the grinding gap. The balls here can freely rotate at the upper end of the grinding ring 9, and all the balls cooperate to form an annular structure. When the grinding ring 9 is installed, the balls can be in contact with or have a clearance fit with the lower end of the conical blanking port 1011, thereby preventing frictional contact between the two.

[0032] As a preferred implementation in this embodiment, it should be further noted that the lower part of the conical feeding port 1011 is a vertically extending part. An annular installation groove is provided on the outer wall of the vertically extending part. An annular installation plate 12 is rotatably connected in the annular installation groove. The edge of the annular installation plate 12 extends outside the annular installation groove to ensure the stability and flexibility of the annular installation plate 12. It should be noted that in order to reduce friction, an annular ball groove can be provided between the surfaces where the annular installation plate 12 contacts the annular installation groove. A plurality of balls are installed in the annular ball groove. The annular installation plate 12 and the annular installation groove are designed to be in a matching relationship similar to that of the inner ring and outer ring of a bearing, so that the annular installation plate 12 and the annular installation groove do not have direct surface contact, thereby reducing the friction between the two and ensuring the service life of the equipment. Of course, this is not the main design point of the present invention, so it will not be described in detail here; a plurality of screw rods 13 are fixed to the upper edge of the grinding ring 9. A plurality of through holes are designed in advance on the annular installation plate 12. When the grinding ring 9 is installed, the upper part of each screw rod 13 passes through a through hole of the annular installation plate 12, and a plurality of locking nuts 14 are pressed against the upper end of the edge of the annular installation plate 12. Each locking nut 14 is threadedly connected to a screw rod 13. By adjusting the screw of the locking nut 14 on the screw rod 13, the pressing of the locking nut 14 against the upper end of the edge of the annular installation plate 12 can be realized, thereby realizing the limitation of the screw rod 13. Then, the stability of the grinding ring 9 is ensured through the screw rod 13, preventing the grinding ring 9 from falling off. At the same time, it is also convenient to realize the loading and unloading operation of the grinding ring 9, improving flexibility and facilitating the maintenance and adjustment of the equipment. For example, the grinding ring 9 and the driving gear 11 can be replaced simultaneously according to the actual situation, or the grinding ring 9 can be replaced alone, so that the grinding ring 9 can always maintain the best grinding effect.

[0033] As a preferred implementation in this embodiment, it should be further noted that an annular stepped platform, actually an annular groove, is provided on the inner wall of the lower end of the conical feeding port 1011. The annular groove here is as Figure 1 and Figure 2As shown, it does not penetrate the entire discharge port of the conical blanking port 1011. Therefore, a stepped structure is formed at the discharge port of the conical blanking port 1011, and the annular step here can just be used to limit the annular boss 901 in the following text. Specifically, an annular boss 901 is provided in the middle of the upper end of the grinding ring 9, and the annular boss 901 is arranged to match within the annular step, so that the annular boss 901 can rotate within the annular step without affecting the rotation effect of the grinding ring 9. One side of each limiting ball 801 is fixedly connected to the annular boss 901, so as to realize the loading and unloading operation of the limiting ring 8. At the same time, it can control the synchronous rotation of the limiting ring 8 and the grinding ring 9, and cooperate to achieve multiple grinding, making the grinding effect better. Of course, if it is not necessary for the limiting ring 8 to rotate, and only the abutment of the limiting ring 8 and the central shaft 601 is used to enhance the stability of the central shaft 601 during rotation, then the annular boss 901 and the inner wall of the lower end of the conical blanking port 1011 can cooperate to form a limiting ring, and one side of the limiting ball 801 can be placed in the limiting ring in a matching manner. In this way, the loading and unloading operation of the limiting ring 8 can also be realized, which is simple and practical. When one side of the limiting ball 801 is placed in the limiting ring in a matching manner, the limiting ring part on the annular boss 901 can also be used to support the limiting ball 801 to ensure the stability of the entire limiting ring 8.

[0034] As a preferred implementation in this embodiment, it should be further noted that a material receiving bucket 15 is provided below the grinding ring 9. The material receiving bucket 15 is preferably a cylindrical structure with an open upper end. A plurality of rolling balls 16 are embedded at the upper end of the material receiving bucket 15 to ensure the stability of the rolling balls 16 and enable the rolling balls 16 to freely roll on the upper end of the material receiving bucket 15. When the material receiving bucket 15 is placed below the grinding ring 9, each rolling ball 16 can rollingly contact the bottom surface of the grinding ring 9. Thus, the rolling balls 16 can form a certain support for the grinding ring 9 without hindering the rotation of the grinding ring 9. At the same time, the material receiving bucket 15 can be used to receive the powder after grinding. Moreover, due to the existence of the rolling balls 1, when the material receiving bucket 15 is placed, there will not be too much friction between the material receiving bucket 15 and the grinding ring 9, which can make the placement of the material receiving bucket 15 easier. At the same time, the rolling contact between the rolling balls 16 and the bottom surface of the grinding ring 9 can also exert a certain pressure on the material receiving bucket 15 to ensure the stability of the material receiving bucket 15, so that the material receiving bucket 15 can stably receive materials at the lower end of the roasting furnace body 1 during operation. After the material receiving is completed, only the material receiving bucket 15 needs to be removed, and the solid oxide in the material receiving bucket 15 can be processed, which is simple and convenient. Furthermore, in order to facilitate the movement of the material receiving bucket 15, a handle can also be provided on the barrel wall of the material receiving bucket 15 to facilitate the application of force to control the material receiving bucket

[0035] As a preferred implementation in this embodiment, it should be further noted that a sealing cavity 1021 is provided on the inner top surface of the baking furnace upper cover 102. Specifically, as Figure 1 shown, the sealing cavity 1021 is located in the middle of the inner top surface of the baking furnace upper cover 102, facilitating the central axis 601 to pass through the sealing cavity 1021 and be connected to the rotating motor 7. A ball bearing 17 is installed in the sealing cavity. The outer ring of the ball bearing 17 is connected to the sealing cavity 1021 to ensure the stability of the ball bearing 17. The inner ring of the ball bearing 17 is in contact with the central axis 601. Here, the inner ring of the ball bearing 17 can be directly fixedly connected to the central axis 601 or just in contact with the central axis 601 without a specific connection relationship, further enhancing the stability of the central axis 601, so that the central axis 601 can be stabilized by the limit of the ball bearing 17 when rotating.

[0036] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromagnetic induction heating acid regeneration spray roasting furnace, characterized in that It includes a roasting furnace body (1) with a furnace cavity provided therein, and an induction coil (2) for increasing the temperature in the furnace cavity is provided on the roasting furnace body (1); an acid waste input pipe (3) communicating with the pickling line is provided at the upper part of the furnace cavity, and a plurality of spray guns (4) for spraying acid waste downward are installed on the acid waste input pipe (3), an oxygen input pipe (5) is provided at the lower part of the furnace cavity, and the oxygen input pipe (5) communicates with a pure oxygen storage tank or an oxygen-enriched gas storage tank; a flue gas discharge pipe is provided on the top surface of the roasting furnace body (1).

2. The electromagnetic induction heating acid regeneration spray roasting furnace according to claim 1, characterized in that, The roasting furnace body (1) includes a roasting furnace main body (101) with an open upper end and a roasting furnace upper cover (102) buckled on the upper end of the roasting furnace main body (101), and the flue gas discharge pipe is provided on the roasting furnace upper cover (102); a circular groove is provided at the upper end of the roasting furnace main body (101), and the roasting furnace body (1) further includes a heat conduction ring (103) provided in the circular groove, and the induction coil (2) is provided in the circular groove outside the heat conduction ring (103); the acid waste input pipe (3) is installed inside the roasting furnace upper cover (102).

3. The electromagnetic induction heating acid regeneration spray roasting furnace according to claim 2, characterized in that, A limiting ring abutting against the inner wall of the circular groove is provided at the lower end of the heat conduction ring (103), and the induction coil (2) is provided on the limiting ring; the outer diameter of the upper end of the heat conduction ring (103) is a conical platform gradually increasing from top to bottom, and a circular positioning groove is formed by the cooperation between the conical platform and the roasting furnace main body (101), a circular positioning block is provided in the middle of the lower end of the roasting furnace upper cover (102), the circular positioning block is matched and arranged in the circular positioning groove, and the bottom surfaces of the roasting furnace upper cover (102) on both sides of the circular positioning block are respectively abutted against the upper end surface of the roasting furnace main body (101) and the upper end surface of the heat conduction ring (103).

4. The electromagnetic induction heating acid regeneration spray roasting furnace according to claim 3, wherein A spiral stirring blade (6) located between the spray gun (4) and the oxygen input pipe (5) is provided inside the heat conduction ring (103), a rotating motor (7) is fixed in the middle of the top surface of the roasting furnace upper cover (102), and the rotating motor (7) is connected to the central axis (601) of the spiral stirring blade (6); the acid waste input pipe (3) includes a plurality of annular pipes coaxially arranged and all sleeved outside the central axis (601), adjacent annular pipes are communicated through connecting pipes, and a plurality of spray guns (4) are installed at the lower end of each annular pipe.

5. The electromagnetic induction heating acid regeneration spray roasting furnace according to claim 4, wherein The main body of the roasting furnace (101) is a conical blanking port (1011) with an opening that gradually decreases from top to bottom. A limiting ring (8) is rotatably connected to the inner wall at the lower end of the conical blanking port (1011). The limiting ring (8) includes a plurality of limiting balls (801). The middles of all the limiting balls (801) are penetrated by a circular connecting ring (802). All the limiting balls (801) are evenly distributed on the circular connecting ring (802), and an arc-shaped limiting member (803) sleeved outside the circular connecting ring (802) is abutted between any two adjacent limiting balls (801); an annular limiting groove is provided on the inner wall at the lower end of the conical blanking port (1011). One side of all the limiting balls (801) is correspondingly arranged in the annular limiting groove. The lower part of the central shaft (601) penetrates the conical blanking port (1011), and the other side of all the limiting balls (801) abuts against or has a clearance fit with the central shaft (601).

6. The electromagnetic induction heating acid regeneration spray roasting furnace according to claim 5, characterized in that, A grinding ring (9) sleeved outside the central shaft (601) is rotatably connected below the discharge port of the conical blanking port (1011). A grinding gap is provided between the grinding ring (9) and the central shaft (601), and the grinding gap gradually decreases from top to bottom; a driving motor (10) is installed at the lower end of the conical blanking port (1011). A driving gear (11) is installed on the motor shaft of the driving motor (10). Passive meshing teeth distributed in a ring shape are provided on the outer wall of the grinding ring (9), and the passive meshing teeth are meshed with the driving gear (11).

7. The electromagnetic induction heating acid regeneration spray roasting furnace according to claim 6, characterized in that, The lower part of the conical blanking port (1011) is a vertically extending part. An annular installation groove is provided on the outer wall of the vertically extending part. An annular installation plate (12) is rotatably connected in the annular installation groove, and the edge of the annular installation plate (12) extends outside the annular installation groove; a plurality of screw rods (13) are fixed to the edge of the upper end of the grinding ring (9). Each screw rod (13) penetrates the annular installation plate (12), and a plurality of locking nuts (14) are abutted against the upper end of the edge of the annular installation plate (12). Each locking nut (14) is threadedly connected to a screw rod (13).

8. The electromagnetic induction heating acid regeneration spray roasting furnace according to claim 6, wherein An annular stepped platform that is recessed outward is provided on the inner wall at the lower end of the conical blanking port (1011). An annular boss (901) is provided in the middle of the upper end of the grinding ring (9). The annular boss (901) is correspondingly arranged in the annular stepped platform, and one side of each limiting ball (801) is fixedly connected to the annular boss (901).

9. The electromagnetic induction heating acid regeneration spray roasting furnace according to any one of claims 6-8, characterized in that, A material receiving bucket (15) is provided below the grinding ring (9). A plurality of balls (16) are embedded in the upper end of the material receiving bucket (15), and each ball (16) is in rolling contact with the bottom surface of the grinding ring (9).

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