A magnetic separation and screening machine

Abstract

The application provides a magnetic separation and screening machine, and relates to the technical field of polysilicon, which comprises a shell with a feeding inlet and a powder outlet; a screening zone and a magnetic separation zone are arranged between the feeding inlet and the powder outlet; the screening zone is provided with a block outlet; a material conveyor is used for feeding material to the screening zone; a screening tool is arranged in the screening zone; one end of the screening tool extends to the screening outlet; an iron core is arranged in the magnetic separation zone in an inclined manner; a coil is wound around the iron core and is provided with a power supply circuit; an outer shell is wrapped around the coil, and the outer shell has self-lubricating property; silicon powder first passes through the upper surface of the outer shell and then enters the powder outlet; a timing controller is connected to a control loop of the material conveyor on one side and connected to a switching element for controlling the power supply circuit on the other side. The application has the functions of screening and magnetic separation, and can recover and process separated silicon blocks, silicon powder and magnetic powder respectively, thereby improving the utilization value of the materials.

Description

Technical Field

[0001] This utility model relates to the field of polycrystalline silicon technology, and in particular to a magnetic separation and screening machine. Background Technology

[0002] During the polysilicon production process, a large amount of silicon blocks (fragments) and silicon powder (powdered material) are generated. At the same time, the mechanical cleaning of components such as heat insulation rings installed in the reduction furnace generates a large amount of silicon powder containing metal impurities. Although these silicon powders themselves have certain product sales value, they are often treated as low-value materials because the internal metal impurities cannot be separated, resulting in a huge waste of resources and efficiency. For example, the current industry practice is to sell them as scrap material or send them back to the source of the process for purification.

[0003] The purpose of this application is to design a magnetic separation and screening machine that combines screening and magnetic separation functions to improve the utilization value of these silicon blocks and silicon powders. Utility Model Content

[0004] In view of the above situation, this utility model provides a magnetic separation screening machine, which aims to design a magnetic separation screening machine that combines screening and magnetic separation functions to improve the utilization value of these silicon blocks and silicon powders.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a magnetic separation screening machine, comprising:

[0007] The shell has a feed inlet and a powder outlet; a screening zone and a magnetic separation zone are arranged vertically between the feed inlet and the powder outlet; the screening zone has a block material outlet;

[0008] Material conveyors are used to deliver materials to the screening area;

[0009] A screening tool is set in the screening zone; one end of the screening tool extends to the screening outlet.

[0010] The iron core is inclined and set in the magnetic separation zone;

[0011] The coil is wound around an iron core and equipped with a power supply circuit;

[0012] The outer shell covers the coil and has self-lubricating properties; the silicon powder first passes through the upper surface of the outer shell and then enters the powder outlet;

[0013] The timing controller's output signal is connected to the control circuit of the material conveyor on one hand, and to the switching element that controls the on / off state of the power supply circuit on the other hand.

[0014] In some embodiments of this utility model, the outer shell is made of polytetrafluoroethylene.

[0015] In some embodiments of this invention, multiple coils are arranged alternately on opposite sides of the magnetic separation zone.

[0016] In some embodiments of this invention, the timing controller includes a time relay.

[0017] In some embodiments of this utility model, the material conveyor is located at the inlet of the feed port.

[0018] In some embodiments of this utility model, the material conveyor is disposed between the feed inlet and the screening section.

[0019] In some embodiments of this utility model, the material conveyor is a screw conveyor.

[0020] In some embodiments of this utility model, the screening tool includes a perforated conveyor belt.

[0021] In some embodiments of this utility model, the screening tool is arranged at an angle.

[0022] In some embodiments of this invention, at least two screening tools are arranged at vertical intervals.

[0023] The embodiments of this utility model have at least the following advantages or beneficial effects:

[0024] 1. Material containing silicon blocks, silicon powder, and magnetic powder enters the shell through the feed inlet. First, under the action of a screening tool, the silicon blocks are separated from the silicon powder and magnetic powder. The silicon blocks are discharged from the block outlet, while the silicon powder and magnetic powder fall into the magnetic separation zone. After the coil is energized by the power supply circuit, a magnetic field is generated in the magnetic separation zone, attracting the magnetic powder to the upper surface of the shell. The silicon powder rolls down the shell surface to the powder outlet, thus separating the silicon powder and magnetic powder. In this way, the separated silicon blocks, silicon powder, and magnetic powder can be recycled and processed separately, improving the utilization value of these materials.

[0025] 2. After running for a period of time, the timer controller stops the material conveyor from conveying materials and disconnects the power supply circuit to pause the feeding of materials from the inlet and cancel the magnetic field in the magnetic separation zone. The magnetic powder is discharged from the powder outlet under the action of gravity, thereby keeping the surface of the outer shell clean and achieving the purpose of continuous sorting.

[0026] Other features and advantages of this invention will be set forth in the following description. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a magnetic separator and screening machine;

[0029] Figure 2 This is a structural diagram of the iron core, coil, and outer casing.

[0030] Icons: 1-Shell, 11-Feed inlet, 12-Powder outlet, 13-Screening zone, 14-Magnetic separation zone, 15-Block material outlet, 2-Material conveyor, 3-Screening tool, 4-Iron core, 5-Coil, 6-Shell, 7-Feed hopper. Detailed Implementation

[0031] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention.

[0032] In the description of the embodiments of this utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0033] Furthermore, the term "multiple" means two or more, unless otherwise explicitly specified.

[0034] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0035] The embodiments of this utility model will be described in detail below.

[0036] Example 1

[0037] See Figures 1-2 This embodiment provides a magnetic separation screening machine, including a housing 1, a material conveyor 2, a screening tool 3, an iron core 4, a coil 5, a casing 6, and a timer controller (not shown in the figure).

[0038] The top of the shell 1 has a feed inlet 11 and the bottom has a powder outlet 12; a sieve section 13 and a magnetic separation section 14 are arranged vertically between the feed inlet 11 and the powder outlet 12, and the sieve section 13 has a block material outlet 15.

[0039] Material conveyor 2 is used to deliver materials to screening section 13.

[0040] Screening tool 3 is disposed in screening section 13, which screens lumpy materials and powdery materials according to their volume. The lumpy materials include silicon lumps, and the powdery materials include silicon powder and magnetic powder. One end of screening tool 3 extends to screening outlet to discharge silicon lumps from lump material outlet 15. At least two screening tools 3 are arranged at vertical intervals.

[0041] The iron core 4 is tilted and set in the magnetic separation zone 14.

[0042] The coil 5 is wound around the iron core 4 and is equipped with a power supply circuit;

[0043] The outer shell 6 covers the coil 5 and has self-lubricating properties; the silicon powder first passes through the upper surface of the outer shell 6 and then enters the powder outlet 12.

[0044] The output signal of the timing controller (such as a time relay or a programmable logic controller PLC) is connected to the control circuit of the material conveyor 2 on one hand, and to the switching element (such as a contactor or intermediate relay) that controls the on / off state of the power supply circuit on the other hand.

[0045] Material containing silicon blocks, silicon powder, and magnetic powder enters the shell 1 through the feed inlet 11. First, under the action of the screening tool 3, the silicon blocks are separated from the silicon powder and magnetic powder. The silicon blocks are discharged from the block material outlet 15, while the silicon powder and magnetic powder fall into the magnetic separation zone 14. After the coil 5 is energized by the power supply circuit, a magnetic field (electromagnetism) is generated in the magnetic separation zone 14, attracting the magnetic powder to the upper surface of the shell 6. The silicon powder rolls down the surface of the shell 6 to the powder outlet 12, thus separating the silicon powder and magnetic powder. After a period of operation, the timer controller stops the material conveyor 2 and disconnects the power supply circuit, pausing the material input from the feed inlet 11 and canceling the magnetic field in the magnetic separation zone 14. The magnetic powder is then discharged from the powder outlet 12 under gravity, thus keeping the surface of the shell 6 clean and achieving continuous sorting. In this way, the separated silicon blocks, silicon powder, and magnetic powder can be recovered and processed separately, improving the utilization value of these materials.

[0046] Example 2

[0047] See Figures 1-2The outer shell 6 is made of PTFE, that is, polytetrafluoroethylene, which has a low coefficient of friction, self-lubricating properties, and a very smooth surface, making it particularly suitable for the aforementioned magnetic separator.

[0048] like Figure 2 As shown, the material conveyor 2 is located at the inlet of the feed port 11, and the inlet of the material conveyor 2 is connected to the feed hopper 7. The material conveyor 2 is a screw conveyor, and the timer controller can control the start and stop of the screw conveyor. When the screw conveyor starts, the material can enter the screening section 13; when the screw conveyor stops, the material cannot enter the screening section 13.

[0049] Example 3

[0050] See Figures 1-2 The material conveyor 2 is located between the feed inlet 11 and the screening section 13. The material conveyor 2 is a valve (not shown in the figure), and the timer controller can control the opening and closing of the valve. When the valve is open, the material can enter the screening section 13; when the valve is closed, the material cannot enter the screening section 13.

[0051] Example 4

[0052] See Figures 1-2 The screening tool 3 includes a screen, which can be arranged at an angle or horizontally.

[0053] Example 5

[0054] like Figure 2 As shown, the screening tool 3 includes a perforated conveyor belt that transports the silicon blocks placed above it to the block outlet 15. The conveyor belt can be arranged at an angle or horizontally.

[0055] Example 6

[0056] See Figures 1-2 Unlike Example 1, in this example, the number of screening tools 3 is one.

[0057] Example 7

[0058] See Figures 1-2 In this embodiment, multiple coils 5 are arranged alternately on opposite sides of the magnetic separation zone 14 to improve the magnetic separation effect. Each coil 5 is equipped with an iron core 4 and a housing 6.

[0059] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A magnetic separation and sizing machine characterized by, include: The casing has a feed inlet and a powder outlet; A sieve zone and a magnetic separation zone are arranged vertically between the feed inlet and the powder outlet; The screening section has a block material outlet; A material conveyor is used to deliver materials to the screening section; A screening tool is disposed in the screening section; one end of the screening tool extends to the block material outlet; The iron core is inclinedly arranged in the magnetic separation zone; A coil, wound around the iron core, is equipped with a power supply circuit; The outer casing covers the coil and has self-lubricating properties; the silicon powder first passes through the upper surface of the outer casing and then enters the powder outlet; The timing controller outputs its signal to the control circuit of the material conveyor on one hand, and to the switching element that controls the on / off state of the power supply circuit on the other hand.

2. The magnetic separator according to claim 1, characterized in that, The outer shell is made of polytetrafluoroethylene.

3. The magnetic separator according to claim 1, characterized in that, Multiple coils are arranged alternately on opposite sides of the magnetic separation zone.

4. The magnetic screening and sorting machine of claim 1, wherein, The timing controller includes a time relay.

5. The magnetic separator according to claim 1, characterized in that, The material conveyor is located at the inlet of the feed port.

6. The magnetic separator according to claim 1, characterized in that, The material conveyor is located between the feed inlet and the screening section.

7. The magnetic separator according to claim 1, characterized in that, The material conveyor is a screw conveyor.

8. The magnetic separator according to claim 1, characterized in that, The screening tool includes a perforated conveyor belt.

9. The magnetic separator according to claim 1, characterized in that, The screening tool is arranged at an angle.

10. The magnetic separator according to claim 1, characterized in that, At least two of the screening tools are arranged at vertical intervals.

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