Multifunctional rotary hearth furnace for treating high-calcium zinc-containing dust pellets

Abstract

The utility model relates to the field of metallurgical engineering, in particular to a multifunctional rotary hearth furnace for treating high-calcium zinc-containing dust pellets, which comprises a furnace body (1). A microwave heater (101), an exhaust hole (2) and a gas adding structure are respectively arranged at the top of the furnace body (1); a connecting structure is arranged on the exhaust hole (2); a hearth (3) is arranged at the bottom of the furnace body (1); the furnace hearth (3) is connected with a driving structure; the sealing plates or the blocking walls are flexibly selected to be installed on the connecting structures of the exhaust holes, and therefore the whole heating cavity can be divided into a plurality of independent heating areas. Gas cross contamination between different heating areas can be prevented; and microwaves of the microwave heater directly act on the high-calcium low-carbon pellets, the heating process is very uniform, the common problems of uneven temperature and local overheating in a traditional heating mode are avoided, energy consumption is reduced, and the overall performance of the system is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to metallurgical engineering field, specifically, the utility model relates to a kind of multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet processing. BACKGROUND

[0002] With the continuous development of industrial production, the production of zinc-containing dust is increasing;These zinc-containing dust is mainly from steel production, non-ferrous metal smelting and other industries, which contains a large amount of zinc, iron and other metal elements;High calcium low carbon pellet is an efficient method for treating zinc-containing dust;The formation of calcium ferrite phase is not only beneficial to the removal of zinc, but also helps to increase the mechanical strength of the pellet, more importantly, it can significantly reduce the energy loss;However, the roasting method of high calcium low carbon pellet is relatively strict, and the whole process needs to be completed under different atmosphere and temperature conditions.

[0003] The current rotary hearth furnace burns through flat flame burner, and the low temperature of back flame surface leads to uneven reduction and serious heat loss;Moreover, the existing rotary hearth furnace has single heating area and fixed heating condition, and combined with uneven temperature control, it is easy to appear melting and sticking to wall and other adverse phenomena, which seriously affects the quality and production efficiency of the pellet.

[0004] The applicant found, through retrieval, that Chinese patent document No. 103667575A disclosed a rotary hearth furnace bottom and a rotary hearth furnace with the rotary hearth furnace bottom on March 26, 2014, which comprises a base and a slag-resistant casting layer formed on the upper surface of the base, wherein the slag-resistant casting layer comprises bauxite, brown corundum, silicon carbide, graphite, carbon oxidizer and binder;The device cannot solve the above technical problems.

[0005] Therefore, in order to improve or solve at least one of the above problems, it is necessary to provide a multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet processing, which has good heating effect and can flexibly adjust the heating time and heating atmosphere. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet processing, which has good heating effect and can flexibly adjust the heating time and heating atmosphere.

[0007] In order to solve the above technical problems, the utility model adopts the technical scheme: a multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet processing, comprising a furnace body;The top of the furnace body is respectively provided with a microwave heater, an exhaust hole and a gas adding structure;The exhaust hole is provided with a connecting structure;The bottom of the furnace body is provided with a hearth;The hearth is connected with a driving structure.

[0008] The furnace body comprises a side wall and a top plate; a heating cavity is arranged in the furnace body; high calcium low carbon pellets are arranged on the hearth; the high calcium low carbon pellets are arranged in the heating cavity; the microwave heater, the exhaust hole and the gas adding structure are arranged on the top plate.

[0009] The connecting structure comprises a positioning column; the positioning column is arranged along the edge of the exhaust hole.

[0010] The positioning column comprises a first positioning column; a connecting plate is connected to the first positioning column; a partition wall is connected to the connecting plate; a mounting block is arranged at the top of the partition wall; a smoke exhaust pipe is arranged in the mounting block; a smoke exhaust groove is arranged in the partition wall; the smoke exhaust groove is in communication with the smoke exhaust pipe and the heating cavity respectively.

[0011] The positioning column comprises a second positioning column; a sealing plate is connected to the second positioning column; a mounting hole is arranged on the sealing plate; the second positioning column is inserted into the mounting hole; the sealing plate is arranged at the top of the exhaust hole.

[0012] A plurality of exhaust holes are arranged on the top plate; the exhaust holes are uniformly distributed on the top plate.

[0013] A heater mounting hole is arranged on the top plate; a microwave heater is connected to the top plate; a heating end of the microwave heater is arranged in the heater mounting hole.

[0014] The gas adding structure comprises a gas adding pipe; the gas adding pipe is arranged on one side of the microwave heater; a gas disperser is arranged in the heating cavity; the gas adding pipe is in communication with the gas disperser.

[0015] The smoke exhaust pipe is connected to a heat dissipation water tank.

[0016] The driving structure comprises a motor; the motor comprises a driving gear; a gear tooth is arranged on the hearth; the driving gear is engaged with the gear tooth.

[0017] The beneficial effects of the present application are as follows:

[0018] 1. By flexibly selecting the sealing plate or the partition wall arranged on the positioning column of the exhaust hole, the entire heating cavity can be divided into multiple independent heating areas; the smoke exhaust groove in the partition wall is in communication with the outside at the upper end and with the hot air flow in the heating cavity at the lower end, forming a certain pressure difference; when the gas passes through the smoke exhaust groove, the gas is rapidly discharged outward due to the pressure difference, ensuring that the gas atmosphere in each heating area remains independent and preventing cross-contamination of the gas between different heating areas; this design not only improves the flexibility of the system, but also ensures the consistency and stability of the experimental conditions in each heating area.

[0019] 2, the application has a microwave heater, adopts the mode of microwave heating; the microwave directly acts on the high calcium low carbon pellet, the heating process is very uniform, avoids the common temperature unevenness and local overheating problem in traditional heating mode; microwave heating will not disturb the atmosphere system, the energy loss is small, thereby the reduction performance is significantly improved; the efficiency and uniformity of microwave heating not only improve the quality of high calcium low carbon pellet, but also reduce the energy consumption, further improve the overall performance of the system. BRIEF DESCRIPTION OF DRAWINGS

[0020] The specific embodiments of the utility model will be further described in detail below in combination with the drawings, in which:

[0021] Figure 1 It is the structural schematic view of the multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet treatment.

[0022] Figure 2 It is the structural schematic view of the furnace body of the multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet treatment.

[0023] Figure 3 It is the structural schematic view of the mounting block and barrier wall of the multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet treatment.

[0024] Figure 4 It is the structural schematic view of the sealing plate of the multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet treatment.

[0025] Figure 5 It is the principle diagram of the microwave heating system of the multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet treatment.

[0026] Figure 6 It is the principle diagram of the atmosphere circulation flow of the multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet treatment.

[0027] The marks in the above drawings are:

[0028] The marks in the drawings are:

[0029] 1, furnace body, 101, microwave heater, 102, side wall, 103, top plate, 104, heating cavity,

[0030] 2, exhaust hole, 201, positioning column, 202, first positioning column, 203, second positioning column,

[0031] 3, hearth, 301, gear tooth,

[0032] 4, high calcium low carbon pellet,

[0033] 5, connecting plate, 501, barrier wall, 502, mounting block, 503, smoke exhaust pipe, 504, smoke exhaust groove,

[0034] 6, sealing plate, 601, mounting hole,

[0035] 7, heater mounting hole,

[0036] 8, gas adding pipe, 801, gas disperser,

[0037] 9, motor,

[0038] 10, drive gear. DETAILED DESCRIPTION

[0039] The specific embodiments of the present application are further described in detail below with reference to the drawings, and the purpose is to help the technical personnel in the field to have a more complete, accurate and in-depth understanding of the inventive concept and technical scheme of the present application, and to help them to implement.

[0040] Figure 1 The multifunctional rotary hearth furnace for high calcium zinc-containing dust pellet treatment shown includes a furnace body 1; the top of the furnace body 1 is respectively provided with a microwave heater 101, an exhaust hole 2 and a gas adding structure; the exhaust hole 2 is provided with a connecting structure; the bottom of the furnace body 1 is provided with a hearth 3; the hearth 3 is connected with a driving structure.

[0041] By flexibly selecting to install the sealing plate 6 or the blocking wall 501 on the connecting structure of the exhaust hole 2, the whole heating cavity can be divided into multiple independent heating areas; the gas atmosphere in each heating area is kept independent, which can prevent the gas cross contamination between different heating areas; the microwaves of the microwave heater 101 directly act on the high calcium low carbon pellets 4, the heating process is very uniform, and the problems of uneven temperature and local overheating commonly seen in traditional heating methods are avoided; the microwave heating will not disturb the atmosphere system, and the energy loss is small, thereby significantly improving the reduction performance; the efficiency and uniformity of microwave heating not only improve the quality of the high calcium low carbon pellets 4, but also reduce the energy consumption, further improving the overall performance of the system.

[0042] The furnace body 1 includes a side wall 102 and a top plate 103; the furnace body 1 is provided with a heating cavity 104; the hearth 3 is provided with high calcium low carbon pellets 4; the high calcium low carbon pellets 4 are arranged in the heating cavity 104; the microwave heater 101, the exhaust hole 2 and the gas adding structure are arranged on the top plate 103.

[0043] The furnace body 1 is a cylindrical structure, and the middle part of the furnace body 1 is provided with a circular through hole; the side wall 102 and the top plate 103 are an integral structure; the heating cavity 104 is arranged between the two side walls 102, the top plate 103 and the hearth 3; the hearth 3 is a disc structure; the high calcium low carbon pellets 4 are placed on the hearth 3; the top plate 103 provides mounting positions and stable supports for the microwave heater 101, the exhaust hole 2 and the gas adding pipe 8.

[0044] The connecting structure comprises positioning columns 201; the positioning columns 201 are arranged along the edges of the exhaust holes 2.

[0045] The exhaust holes 2 are square holes; the exhaust holes 2 are through holes; the positioning columns 201 are fixedly connected to the top of the top plate 103; a plurality of positioning columns 201 are arranged along the edges of the exhaust holes 2.

[0046] The positioning columns 201 comprise first positioning columns 202; the first positioning columns 202 are connected with connecting plates 5; the connecting plates 5 are connected with barrier walls 501; the barrier walls 501 are provided with mounting blocks 502 at the top; the mounting blocks 502 are provided with smoke exhaust pipes 503; the barrier walls 501 are provided with smoke exhaust grooves 504; the smoke exhaust grooves 504 are respectively communicated with the smoke exhaust pipes 503 and the heating cavities 104.

[0047] The connecting plates 5 and the barrier walls 501 are integrated structures; the connecting plates 5 are arranged along the edges of the barrier walls 501; the connecting plates 5 are provided with mounting holes; the first positioning columns 202 are inserted into the mounting holes; the mounting blocks 502 are square blocks; the mounting blocks 502 and the barrier walls 501 are integrated structures; the barrier walls 501 are inserted into the heating cavities 104 through the exhaust holes 2; the barrier walls 501 can divide the entire heating cavities 104 into a plurality of independent heating areas; the smoke exhaust grooves 504 in the barrier walls 501 have upper ports communicated with the outside and lower ports communicated with the hot air flow in the heating cavities 104, so that a certain pressure difference is formed; when the gas passes through the smoke exhaust grooves 504, the gas is rapidly discharged outward due to the pressure difference, so that the gas atmosphere in each heating area is kept independent, and the gas cross contamination between different heating areas is prevented.

[0048] The positioning columns 201 comprise second positioning columns 203; the second positioning columns 203 are connected with sealing plates 6; the sealing plates 6 are provided with mounting holes 601; the second positioning columns 203 are inserted into the mounting holes 601; the sealing plates 6 are arranged at the top of the exhaust holes 2.

[0049] The mounting holes 601 are connected with the second positioning columns 203; so that the sealing plates 6 can be fixedly connected to the exhaust holes 2 to shield the exhaust holes 2; the sealing plates 6 can ensure the structural integrity and closure of the heating cavities 104.

[0050] A plurality of exhaust holes 2 are arranged on the top plate 103; the exhaust holes 2 are uniformly distributed on the top plate 103.

[0051] The plurality of exhaust holes 2 are equally spaced on the top plate 103; according to the experimental needs, the sealing plates 6 or the barrier walls 501 are flexibly selected to be installed on the exhaust holes 2, so that the entire heating cavities 104 can be divided into a plurality of spatially different independent heating areas.

[0052] The top plate 103 is provided with a heater mounting hole 7; the microwave heater 101 is connected to the top plate 103; and the heating end of the microwave heater 101 is arranged in the heater mounting hole 7.

[0053] The microwave heater 101 heats by emitting microwaves, replaces the traditional burner, effectively avoids the damage of the burner to the atmosphere, significantly enhances the reduction or oxidation effect, and makes the heating system and the atmosphere system basically independent of each other; meanwhile, the microwaves are blocked by the blocking wall 501 in the heating cavity 104, ensuring the independence of each heating area and avoiding the heat conduction and atmosphere interference between different heating areas; the microwave heating directly acts on the experimental receptor, not only improves the heating efficiency, but also to some extent, suppresses the heat loss caused by the heat with the gas exhaust, thereby further improving the energy efficiency of the system and the accuracy of the experiment.

[0054] The gas adding structure comprises a gas adding pipe 8; the gas adding pipe 8 is arranged on one side of the microwave heater 101; a gas disperser 801 is arranged in the heating cavity 104; and the gas adding pipe 8 is in communication with the gas disperser 801.

[0055] The atmosphere gas enters the gas disperser 801 through the gas adding pipe 8, is then uniformly dispersed and introduced into the heating cavity 104, and ensures that the entire experimental environment is in the required gas atmosphere; in the smoke exhaust groove 504 of the blocking wall 501, the upper end of the smoke exhaust groove 504 is connected with the outside, and the lower end of the smoke exhaust groove 504 is in communication with the hot gas flow in the heating cavity 104; due to the pressure difference formed by the temperature difference, the gas in the heating cavity 104 is naturally discharged outward when passing through the smoke exhaust groove 504; these blocking walls 501 not only effectively block the microwaves, but also ensure that the experimental atmospheres of each heating area are independent of each other, preventing cross contamination of the gas.

[0056] The smoke exhaust pipe 503 is connected with a heat dissipation water tank.

[0057] The heat dissipation water tank can cool the high-temperature flue gas output by the smoke exhaust pipe 503 and then deliver the flue gas to the next harmless treatment process, ensuring the stability and safety of the system.

[0058] The driving structure comprises a motor 9; the motor 9 comprises a driving gear 10; the furnace bed 3 is provided with a gear tooth 301; and the driving gear 10 is engaged with the gear tooth 301.

[0059] The motor 9 drives the driving gear 10 to rotate; and the driving gear 10 drives the furnace bed 3 and the high-calcium low-carbon pellet 4 to rotate through the gear tooth 301.

[0060] The specific working process of the utility model is as follows:

[0061] The whole system is divided into heating system and atmosphere system, and both are independent of each other, which can be flexibly adjusted according to experimental conditions; for example, in the experiment requiring two temperatures and two atmospheres, the whole system can be divided into two parts with a time ratio of 1:1, or two parts with a time ratio of 1:2, etc.

[0062] The experiment is divided into two time periods, if the system is divided into two parts with a time ratio of 1:1; the furnace body 1 can be divided into six heating areas; the first three heating areas are the first part, and the last three heating areas are the second part; the two parts are isolated by the partition wall 501, and the remaining exhaust holes 2 are installed with sealing plates 6; gas one is introduced into the first part, and the temperature is set to temperature one; gas two is introduced into the second part, and the temperature is set to temperature two; the rotation time is set by the driving device to ensure that the high calcium and low carbon pellets 4 stay in each part for enough time to complete the corresponding processing steps;

[0063] Example 1:

[0064] After mixing calcium oxide, zinc-containing dust and coal powder, the high calcium and zinc-containing dust pellets made by the pelletizer are set in the multifunctional reaction furnace, which is divided into two parts in total, the first part is composed of the first four heating areas, and the second part is composed of the last two heating areas, the two parts are isolated by the partition wall 501, and the remaining exhaust holes 2 are installed with sealing plates 6; the first part is a reducing atmosphere, maintaining a temperature of about 1200℃ for 20 minutes; the second part is an air atmosphere, maintaining a temperature of about 1150℃ for 10 minutes; the rotation time of the furnace body 1 driven by the driving device is set to 30 minutes.

[0065] Example 2:

[0066] After mixing calcium oxide, zinc-containing dust and coal powder, the high calcium and zinc-containing dust pellets made by the pelletizer are set in the multifunctional reaction furnace, which is divided into two parts in total, the first part is composed of the first three heating areas, and the second part is composed of the last three heating areas, the two parts are isolated by the partition wall 501, and the remaining exhaust holes 2 are installed with sealing plates 6; the first part is a reducing atmosphere, maintaining a temperature of about 1200℃ for 15 minutes; the second part is an air atmosphere, maintaining a temperature of about 1150℃ for 15 minutes; the rotation time of the furnace body 1 driven by the driving device is set to 30 minutes.

[0067] Example 3:

[0068] The high calcium zinc-containing dust pellets are made by mixing calcium oxide, zinc-containing dust and coal powder through a pelletizer, a multifunctional reaction furnace is set, and is divided into three parts, the first part is composed of the first two heating areas, the second part is composed of the middle two heating areas, and the third part is composed of the last two heating areas, the three parts are isolated through a partition wall 501, and the remaining exhaust holes 2 are provided with sealing plates 6; the first part is a reducing atmosphere, maintains a temperature of about 1200 DEG C for 10 minutes; the second part is an air atmosphere, maintains a temperature of about 1200 DEG C for 10 minutes, and the third part is an air atmosphere, maintains a temperature of about 1150 DEG C for 10 minutes; the driving device is arranged to drive the furnace body 1 to rotate for 30 minutes.

[0069] The utility model is described exemplarily above in combination with the drawings. Obviously, the utility model is not limited by the above-mentioned mode in the specific implementation. As long as various non-essential improvements are made by adopting the method concept and technical scheme of the utility model, or the above-mentioned concept and technical scheme of the utility model are directly applied to other occasions without improvement, all are within the protection scope of the utility model.

Claims

1. A multi-functional rotary hearth furnace for high calcium zinc containing dust pellet treatment, characterized in that: The application relates to a high-calcium low-carbon pellet microwave heating furnace.

2. A multi-functional rotary hearth furnace for the treatment of high calcium zinc-containing dust pellets according to claim 1, characterized in that: The furnace body (1) comprises a side wall (102) and a top plate (103); the furnace body (1) is provided with a heating cavity (104); the high-calcium low-carbon pellets (4) are arranged on the furnace bed (3); the high-calcium low-carbon pellets (4) are arranged in the heating cavity (104); the microwave heater (101), the exhaust hole (2) and the gas adding structure are arranged on the top plate (103).

3. A multi-functional rotary hearth furnace for the treatment of high calcium zinc bearing dust pellets according to claim 2, characterized in that: The connecting structure comprises a positioning column (201); the positioning column (201) is arranged along the edge of the exhaust hole (2).

4. A multi-functional rotary hearth furnace for the treatment of high calcium zinc bearing dust pellets according to claim 3, characterized in that: The positioning column (201) comprises a first positioning column (202); the first positioning column (202) is connected with a connecting plate (5); the connecting plate (5) is connected with a partition wall (501); the top of the partition wall (501) is provided with a mounting block (502); the mounting block (502) is provided with a smoke exhaust pipe (503); the partition wall (501) is provided with a smoke exhaust groove (504); the smoke exhaust groove (504) is in communication with the smoke exhaust pipe (503) and the heating cavity (104) respectively.

5. A multi-functional rotary hearth furnace for the treatment of high calcium zinc bearing dust pellets according to claim 4, characterized in that: The positioning column (201) comprises a second positioning column (203); the second positioning column (203) is connected with a sealing plate (6); the sealing plate (6) is provided with a mounting hole (601); the second positioning column (203) is inserted into the mounting hole (601); the sealing plate (6) is arranged on the top of the exhaust hole (2).

6. A multi-functional rotary hearth furnace for the treatment of high calcium zinc bearing dust pellets according to claim 5, characterized in that: The top plate (103) is provided with a plurality of exhaust holes (2); the exhaust holes (2) are uniformly distributed on the top plate (103).

7. A multi-functional rotary hearth furnace for the treatment of pellets of high calcium zinc-containing dust according to any one of claims 4-6, characterized in that: The top plate (103) is provided with a heater mounting hole (7); the microwave heater (101) is connected to the top plate (103); the heating end of the microwave heater (101) is arranged in the heater mounting hole (7).

8. A multi-functional rotary hearth furnace for the treatment of high calcium zinc bearing dust pellets according to claim 7, characterized in that: The gas adding structure comprises a gas adding pipe (8); the gas adding pipe (8) is arranged on one side of the microwave heater (101); the heating cavity (104) is provided with a gas disperser (801); the gas adding pipe (8) is in communication with the gas disperser (801).

9. A multi-functional rotary hearth furnace for the treatment of high calcium zinc bearing dust pellets according to claim 8, characterized in that: The smoke exhaust pipe (503) is connected with a heat dissipation water tank.

10. A multi-functional rotary hearth furnace for the treatment of high calcium zinc bearing dust pellets according to claim 9, characterized in that: The driving structure comprises a motor (9); the motor (9) comprises a driving gear (10); the furnace bed (3) is provided with a gear tooth (301); the driving gear (10) is engaged with the gear tooth (301).

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