Submerged arc furnace for metal silicon production

Abstract

The utility model relates to the technical field of submerged arc furnaces, and discloses a submerged arc furnace for metal silicon production, which comprises a furnace body and a discharge mechanism, a distributed feeding mechanism is arranged on the upper portion of the furnace body, and the distributed feeding mechanism comprises a solid material conveying assembly and a pneumatic conveying assembly. The solid material conveying assembly guides raw materials for metal silicon production into the pneumatic conveying assembly, and then the raw materials are conveyed into the furnace body through the pneumatic conveying assembly. The pneumatic conveying assembly comprises a discharging box, a discharging disc is rotationally connected into the discharging box, a plurality of discharging holes are formed in the bottom of the discharging disc, blades are fixedly connected to the upper portion of the discharging disc, the side face of the discharging box communicates with an air conveying pipe, and a feeding port is formed in the upper portion of the air conveying pipe. Powder-shaped production raw materials enter the gas conveying pipe through the feeding port, high-pressure gas in the gas conveying pipe pushes the powder-shaped raw materials to enter the discharging box, meanwhile, the blades drive the discharging disc to rotate, and the powder-shaped production raw materials are discharged in a rotating mode and evenly distributed in the furnace body.

Description

Technical Field

[0001] The utility model relates to the technical field of submerged arc furnaces, in particular to a submerged arc furnace for producing metallic silicon. Background Art

[0002] Existing submerged arc furnaces used for metallic silicon production typically consist of a furnace body, a furnace chamber, a charging port, and electrodes. They operate by generating a high-temperature arc within the furnace chamber via the electrodes, heating raw materials such as silica to a high temperature, triggering a chemical reaction to produce metallic silicon. During the production process, raw materials must be continuously added to the furnace chamber, and the reaction is controlled by manipulating parameters such as the electrode current and voltage. The furnace body also requires cooling to ensure safe operation.

[0003] The materials used in the submerged arc furnace for producing metallic silicon usually include silica, reducing agents (such as coal, coke, etc.) and other auxiliary raw materials.

[0004] According to the "A Submerged Arc Furnace" proposed in CN113587658A, the feeding method of the submerged arc furnace is to add the ore into the furnace shell through a feeding system. The feeding system includes multiple feeding mechanisms distributed in a triangle. Each feeding mechanism includes a feeding port at the top and a feeding pipe at the bottom connected to the smoke hood. The ore enters the feeding pipe through the feeding port and then enters the furnace shell through the feeding pipe.

[0005] However, the above-mentioned method of feeding the electric arc furnace uses a large number of feeding boxes and pipelines, resulting in a complex structure and great difficulty in installation. Moreover, it is difficult to avoid the problem of local accumulation at the lower end of the pipeline when feeding through the pipeline, resulting in insufficient oxidation of the material and affecting the production quality of metallic silicon.

[0006] Therefore, we propose a submerged arc furnace for producing metallic silicon to solve the problems in the above background. Utility Model Content

[0007] The purpose of the utility model is to provide a submerged arc furnace for producing metallic silicon, so as to solve the problems of complicated charging method and local accumulation of materials in the existing submerged arc furnace.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] A submerged arc furnace for producing metallic silicon comprises a furnace body and a discharge mechanism, wherein a distributed feeding mechanism is provided on the upper portion of the furnace body, and the distributed feeding mechanism comprises a solid material conveying component and a pneumatic conveying component;

[0010] The pneumatic conveying assembly includes a discharge box, the lower end of which is open and a discharge tray is rotatably connected inside. A plurality of discharge holes are provided at the bottom of the discharge tray. Blades are fixedly connected to the top of the discharge tray. An air pipe is connected to the side of the discharge box, and a feed port is provided at the top of the air pipe.

[0011] As a further solution of the present invention: the discharge box is circular, and the air pipe enters the interior of the circular discharge box along the tangent direction of the circular discharge box.

[0012] As a further solution of the present invention: a rotating shaft is provided in the middle of the discharge tray, and the upper end of the rotating shaft is fixedly connected to the discharge box.

[0013] As a further solution of the present invention: the blades are curved, and there are multiple blades distributed in a circular array around the rotation axis.

[0014] As a further solution of the present invention: the lower end of the discharge hole is inclined outward.

[0015] As a further solution of the present invention: the solid material conveying assembly includes a storage box, the lower end of the storage box is fixedly connected to a discharge pipe, the interior of the discharge pipe is rotatably connected to a spiral conveying rod, the upper end of the spiral conveying rod is installed with a servo motor, the outside of the servo motor is fixedly connected to a support frame, and the lower end of the discharge pipe is fixedly connected to the feed port of the air pipe.

[0016] As a further solution of the present invention: a screening plate is installed inside the storage box, the screening plate is frustum-shaped, and the spiral conveying rod passes through the inside of the screening plate.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0018] First, the utility model uses a pneumatic conveying component to evenly and dispersely convey the powdered raw materials to the interior of the furnace body, avoiding the agglomeration and accumulation of the raw materials, making the contact between the electrode and the raw materials more complete, and improving the rate of the reduction reaction. The rotating discharge design of the discharge tray enables the powdered raw materials to be evenly distributed inside the furnace body, ensuring uniform distribution of the electric field, further improving the uniformity and efficiency of the reaction. Reasonable raw material particle size and uniform material distribution help to improve the production quality of metallic silicon and reduce the generation of impurities. Compared with the multiple feeding boxes and multiple pipeline designs in the prior art, the structure of the submerged arc furnace is simpler, the installation is convenient and quick, and the industrial production efficiency is improved.

[0019] Second, the screw conveying rod in the solid material conveying assembly of the present invention feeds stably, avoiding the occurrence of blockage. The rotation of the screw conveying rod is controlled by the servo motor, and the feeding speed can be adjusted to ensure steady and uniform feeding, thereby improving the production quality of metallic silicon. The screening plate inside the storage box can screen the powder raw materials to prevent large-particle raw materials from entering the gas pipe and preventing pipeline blockage, while ensuring that the particle size of the feed inside the furnace body is uniform. The frustum-shaped screening plate design is conducive to separating and recycling large-particle raw materials, reducing raw material waste, and improving resource utilization. The entire feeding process is highly controllable, and the feeding speed and material distribution can be flexibly adjusted according to production needs to meet the requirements under different production conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the top structure of the utility model;

[0021] Figure 2 This is a schematic cross-sectional view of the solid material conveying assembly of the present invention;

[0022] Figure 3 This is a schematic cross-sectional view of the pneumatic conveying assembly of the present invention;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the discharge box of the present utility model.

[0024] Among them: 1. Furnace body; 2. Discharge mechanism; 3. Distributed feeding mechanism; 4. Solid material conveying assembly; 5. Pneumatic conveying assembly; 4. Solid material conveying assembly; 41. Storage box; 42. Discharge pipe; 43. Screw conveying rod; 44. Servo motor; 5. Pneumatic conveying assembly; 51. Discharge box; 52. Discharge tray; 53. Blades; 54. Air pipe; 55. Feed port; 56. Discharge hole; 6. Support frame; 7. Screening plate. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Example 1:

[0027] See also Figure 1-4 , the utility model provides a technical solution:

[0028] A submerged arc furnace for producing metallic silicon comprises a furnace body 1 and a discharge mechanism 2. A distributed feeding mechanism 3 is provided on the upper portion of the furnace body 1. The distributed feeding mechanism 3 comprises a solid material conveying assembly 4 and a pneumatic conveying assembly 5. Materials for the submerged arc furnace for producing metallic silicon generally include silica, a reducing agent (such as coal, coke, etc.), and other auxiliary raw materials. The above solid raw materials are crushed, dried, and then uniformly mixed in proportion for use as raw materials.

[0029] The solid material conveying assembly 4 introduces the raw materials for metallic silicon production into the pneumatic conveying assembly 5, and then conveys them into the furnace body 1 through the pneumatic conveying assembly 5;

[0030] The pneumatic conveying assembly 5 includes a discharge box 51, and the storage box 41 is located in the middle of the upper end of the furnace body 1. The discharge box 51 is connected and fixed to the furnace body 1 through a support rod; the lower end of the discharge box 51 is open to facilitate the entry of materials into the interior of the furnace body 1, and a discharge tray 52 is rotatably connected to the inside of the discharge box 51. A plurality of discharge holes 56 are provided at the bottom of the discharge tray 52, and a blade 53 is fixedly connected to the upper part of the discharge tray 52. ​​The side of the discharge box 51 is connected to an air pipe 54, and an inlet 55 is provided at the upper part of the air pipe 54. The powdered raw materials enter the air pipe 54 through the feed port 55. The high-pressure gas inside the air pipe 54 pushes the powdered raw materials into the discharge box 51. The discharge box 51 is circular. The air pipe 54 enters the discharge box 51 along the tangential direction of the circular discharge box 51. The air pipe 54 enters the discharge box 51 along the tangential direction, so that the air force inside the air pipe 54 can better push the blade 53 to rotate around the rotating shaft. At the same time, the powdered raw materials fly out of the discharge hole 56 of the discharge tray 52 under the action of the air force. At the same time, the blade 53 drives the discharge tray 52 to rotate, so that the powdered raw materials fly out of the discharge hole 56 of the discharge tray 52 under the action of the air force. The production raw materials in the shape of a slurry are rotated out and evenly distributed inside the furnace body 1. Under the condition of reasonable arrangement of the position and spacing of the electrodes, the electric field is ensured to be evenly distributed, so that the raw materials can be more evenly affected by the electrodes. By fully dispersing the raw materials before entering the submerged arc furnace, agglomeration or accumulation is avoided, the contact between the electrodes and the raw materials is more complete, and the rate of the reduction reaction is improved. The finer raw material particle size helps to improve the reaction rate and uniformity. The fine particles can increase the surface area, promote contact and reaction with the electrodes, and improve the efficiency of metallic silicon production.

[0031] A rotating shaft is provided in the middle of the discharge tray 52 , and the upper end of the rotating shaft is fixedly connected to the discharge box 51 .

[0032] The blades 53 are curved, and there are multiple blades 53 distributed in an array around the rotation axis.

[0033] The lower end of the discharge hole 56 is inclined outward, which is conducive to the powdered production raw materials being dispersed outward from the discharge hole 56 of the discharge tray 52, thereby avoiding local accumulation of materials.

[0034] The above technical solution is conducive to the full oxidation of materials and improves the production quality of metallic silicon. At the same time, compared with the multi-feeding box and multi-pipeline design in the existing technology, its structure is simpler, the installation is quick and convenient, and the industrial production efficiency is improved.

[0035] Example 2:

[0036] See also Figure 1-4 , and combined with Example 1, it is further obtained that the solid material conveying assembly 4 includes a storage box 41, the lower end of the storage box 41 is fixedly connected to a discharge pipe 42, the inside of the discharge pipe 42 is rotatably connected to a spiral conveying rod 43, the upper end of the spiral conveying rod 43 is installed with a servo motor 44, the outside of the servo motor 44 is fixedly connected to a support frame 6, the lower end of the discharge pipe 42 is fixedly connected to the feed port 55 of the air pipe 54, the servo motor 44 drives the spiral conveying rod 43 to rotate, the spiral conveying rod 43 drives the dry powder raw material into the discharge pipe 42, and conveys it to the air pipe 54, the spiral conveying rod 43 feeds stably to avoid blockage, the servo motor 44 controls the rotation of the spiral conveying rod 43 to adjust the discharge speed, the feeding is steady and uniform, the controllability is strong, and the production quality of metallic silicon is guaranteed.

[0037] A screening plate 7 is installed inside the storage box 41. The screening plate 7 is truncated cone-shaped. The spiral conveying rod 43 passes through the inside of the screening plate 7. The powder raw materials can be screened through the screening plate 7 to prevent large particles of raw materials from entering the gas pipe 54, prevent the pipeline from being blocked, and ensure that the particle size of the feed inside the furnace body 1 is uniform. The truncated cone-shaped screening plate 7 is designed so that large particles of raw materials enter the bottom outside the screening plate 7 to avoid blockage of the screening plate 7, and at the same time it is beneficial to separate and recover large particles of raw materials.

[0038] The working principle of the present invention is as follows: First, silica, reducing agent and other auxiliary raw materials are crushed, dried and evenly mixed in proportion and then used as raw materials. Then, the storage box 41 in the solid material conveying assembly 4 guides the raw materials for metallic silicon production into the discharge pipe 42, and the servo motor 44 drives the screw conveying rod 43 to rotate. The screw conveying rod 43 stably conveys the dry powder raw materials to the feed port 55 of the air pipe 54. In the air pipe 54, the high-pressure gas pushes the powdered raw materials into the inside of the discharge box 51. Since the air pipe 54 enters the circular discharge box 51 in a tangential direction, the air force inside the air pipe 54 can better push the blades 53 to rotate around the rotating shaft. At the same time, the powdered production raw materials fly out from the discharge hole 56 of the discharge tray 52 under the action of the air force, and the blades 53 drives the discharge tray 52 to rotate, causing the powdered production raw materials to be rotated and discharged, and evenly distributed inside the furnace body 1. By rationally arranging the position and spacing of the electrodes, the electric field is evenly distributed, so that the raw materials can be more evenly affected by the electrodes. Finer raw material particle size helps to improve the reaction rate and uniformity. Small particles can increase the surface area, promote contact and reaction with the electrodes, and improve the efficiency of metallic silicon production. In addition, the screening plate 7 inside the storage box 41 can screen the powdered raw materials to prevent large particles of raw materials from entering the gas pipe 54, prevent pipeline blockage, and ensure that the particle size of the feed inside the furnace body 1 is uniform. In summary, the ore-fired furnace for metallic silicon production achieves uniform dispersion and rapid transportation of raw materials through the synergistic effect of the solid material conveying component 4 and the pneumatic conveying component 5, thereby improving the efficiency and quality of metallic silicon production.

[0039] Although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A submerged arc furnace for producing metallic silicon, comprising a furnace body (1) and a discharge mechanism (2), characterized in that: A distributed feeding mechanism (3) is provided on the upper part of the furnace body (1), and the distributed feeding mechanism (3) includes a solid material conveying component (4) and a pneumatic conveying component (5); The pneumatic conveying assembly (5) comprises a discharge box (51), the lower end of the discharge box (51) is open and a discharge tray (52) is rotatably connected thereto, a plurality of discharge holes (56) are provided at the bottom of the discharge tray (52), a blade (53) is fixedly connected to the upper portion of the discharge tray (52), a gas pipe (54) is connected to the side of the discharge box (51), and a feed port (55) is provided at the upper portion of the gas pipe (54).

2. The submerged arc furnace for producing metallic silicon according to claim 1, characterized in that: The discharge box (51) is circular, and the air delivery pipe (54) enters the interior of the circular discharge box (51) along a tangential direction of the circular discharge box (51).

3. The submerged arc furnace for producing metallic silicon according to claim 2, characterized in that: A rotating shaft is provided in the middle of the discharge tray (52), and the upper end of the rotating shaft is fixedly connected to the discharge box (51).

4. The submerged arc furnace for producing metallic silicon according to claim 3, characterized in that: The blades (53) are curved, and there are a plurality of blades (53) distributed in a circular array around the rotation axis.

5. The submerged arc furnace for producing metallic silicon according to claim 1, characterized in that: The lower end of the discharge hole (56) is inclined outward.

6. The submerged arc furnace for producing metallic silicon according to claim 1, characterized in that: The solid material conveying assembly (4) includes a storage box (41), the lower end of the storage box (41) is fixedly connected to a discharge pipe (42), the interior of the discharge pipe (42) is rotatably connected to a spiral conveying rod (43), the upper end of the spiral conveying rod (43) is installed with a servo motor (44), the outside of the servo motor (44) is fixedly connected to a support frame (6), and the lower end of the discharge pipe (42) is fixedly connected to a feed port (55) of an air delivery pipe (54).

7. The submerged arc furnace for producing metallic silicon according to claim 6, characterized in that: A screening plate (7) is installed inside the material storage box (41), and the screening plate (7) is in a truncated cone shape. The spiral conveying rod (43) passes through the inside of the screening plate (7).

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