Silicon material pickling equipment

Abstract

The silicon material pickling equipment comprises a base, a tank body, a discharging channel, an acid inlet channel and a first driving mechanism, the tank body is movably arranged on the base and provided with a plurality of cleaning tanks arranged in the first direction, and a channel capable of being closed and opened is arranged between every two adjacent cleaning tanks. The discharging channel is arranged outside the tank body, is communicated with the interior of the tank body and is used for discharging the silicon material and the acid liquor in the tank body; the acid inlet channel is arranged outside the tank body, is communicated with the interior of the tank body and is used for conveying acid liquor into the tank body; the first driving mechanism is used for driving the groove body to rotate relative to the base, so that the first direction intersects with the horizontal direction, and the silicon materials are discharged out of the groove body from the discharging channel under the action of gravity. According to the scheme, a large number of silicon materials can be prevented from blocking the discharging channel when being discharged simultaneously, and the pickling process efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of solid purification equipment, and particularly to a silicon material pickling equipment. Background Art

[0002] In the production process of polysilicon materials such as solar silicon and electronic-grade polysilicon, silicon materials with metal impurities usually need to be pickled to remove surface impurities. The pickling process plays a crucial role in controlling the surface metal of the product, ensuring the final performance, efficiency, and stability of the product.

[0003] The existing pickling process requires soaking the silicon material in the acid solution and then discharging it. Since the silicon material is usually in the form of small-sized particles and has a large viscosity in the acid solution, it is difficult to discharge the silicon material from the pickling equipment, reducing the efficiency of the pickling process. Summary of the Utility Model

[0004] The main technical problem to be solved by this application is to provide a silicon material pickling equipment, which can avoid blocking the discharge channel when a large amount of silicon material is discharged simultaneously, and improve the efficiency of the pickling process.

[0005] To solve the above technical problem, a technical solution adopted by this application is: to provide a silicon material pickling equipment, including: a base, a tank body, a discharge channel, an acid inlet channel, and a first driving mechanism; the tank body is movably arranged on the base, and is provided with a plurality of cleaning tanks arranged in a first direction, and a channel that can be closed and opened is arranged between adjacent two of the cleaning tanks; the discharge channel is arranged outside the tank body and is communicated with the inside of the tank body for discharging the silicon material and acid solution inside the tank body; the acid inlet channel is arranged outside the tank body and is communicated with the inside of the tank body for conveying acid solution into the tank body; the first driving mechanism is used to drive the tank body to rotate relative to the base so that the first direction intersects with the horizontal direction, and the silicon material is discharged from the tank body through the discharge channel under the action of gravity.

[0006] Preferably, a separator is arranged between adjacent two of the cleaning tanks, and the separator is used to separate adjacent two of the cleaning tanks; wherein, the separator is slidably arranged in a sliding groove on the inner side wall of the tank body, and the separator slides in the tank body under the drive of a second driving mechanism to open or close the channel between adjacent two of the cleaning tanks.

[0007] Preferably, the silicon material pickling equipment further includes: a drainage channel and a screen, the drainage channel is arranged outside the tank body and is communicated with the inside of the tank body for discharging the water inside the tank body; the screen is arranged inside the tank body and is located upstream of the drainage channel and downstream of the discharge channel for filtering the water entering the drainage channel.

[0008] Preferably, a slot is provided on the inner side wall of the tank body, and opposite ends of the screen are fixedly connected to the tank body through the slot.

[0009] Preferably, the number of the acid inlet channels is multiple, and the multiple acid inlet channels are arranged in one-to-one correspondence with the multiple cleaning tanks, and the acid inlet channels communicate with the corresponding cleaning tanks.

[0010] Preferably, a first hinge member and a second hinge member are further connected to the outer surface of the tank body facing the base. The first hinge member and the second hinge member are arranged at intervals along the first direction, and the second hinge member is arranged on one side of the first hinge member close to the discharge channel; the first driving mechanism is movably connected to the base, and the output shaft of the first driving mechanism is hinged to the first hinge member; the base is hinged to the tank body through the second hinge member.

[0011] Preferably, a cushion block is provided between the base and the tank body, and the height of the cushion block is the same as the height of the second hinge member.

[0012] Preferably, a vibrator is fixedly connected to the outer surface of the tank body facing the base.

[0013] Preferably, the tank body has an opening; the silicon material pickling equipment further includes a cover plate, and the cover plate is detachably connected to the tank body for covering the opening.

[0014] Preferably, the silicon material pickling equipment further includes: a three-way vibrating screen, which is located outside the tank body and communicates with the outlet end of the discharge channel.

[0015] The beneficial effects of the present application are: Different from the prior art, the silicon material pickling equipment of the present application includes a base and a tank body that are movably connected. The tank body can be switched between a horizontal state and an inclined state relative to the base under the drive of the first driving mechanism. In the horizontal state, the silicon material can be laid flat in the tank body. On the one hand, it can be completely immersed in the acid solution to ensure the pickling and impurity removal effect; on the other hand, it makes the tank body and the base evenly stressed to ensure the reliability of the equipment. In the inclined state, the silicon material can quickly discharge from the discharge channel of the tank body along the first direction under the action of its own gravity and the flushing of the acid solution. The silicon material pickling equipment of the present application further includes a plurality of cleaning tanks. When the channel between two adjacent cleaning tanks is opened, the silicon material and the acid solution can flow between the cleaning tanks. When the channel is closed, each cleaning tank can become an independent cleaning space. By controlling the opening and closing of a single or multiple channels, it is possible to achieve partition cleaning and batch discharging, avoiding blockage of the discharge channel when a large amount of silicon material is discharged at the same time, and improving the efficiency of the pickling process. Description of the Drawings

[0016] Figure 1It is a schematic structural diagram of an embodiment of the silicon material pickling equipment of the present application;

[0017] Figure 2 It is a top view of the tank body of the silicon material pickling equipment of the present application

[0018] Figure 3 It is a side view of the silicon material pickling equipment in a horizontal state;

[0019] Figure 4 It is a side view of the silicon material pickling equipment in an inclined state and all channels are closed;

[0020] Figure 5 It is a side view of the silicon material pickling equipment in an inclined state and the bottommost channel is open. Specific embodiments

[0021] To make the purpose, technical solutions and effects of the present application clearer and more definite, the following further describes the present application in detail with reference to the accompanying drawings and by way of examples. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0022] Refer to Figure 1 and Figure 2 , Figure 1 This application provides a schematic structural diagram of a silicon material pickling equipment, Figure 2 It is a top view of the tank body of the silicon material pickling equipment of the present application. The silicon material pickling equipment 10 includes: a base 11, a tank body 12, a discharge channel 13, an acid inlet channel 14, and a first driving mechanism 15. The tank body 12 is movably arranged on the base 11. A plurality of cleaning tanks 121 arranged along the first direction X are provided in the tank body 12, and channels that can be closed and opened are provided between adjacent two cleaning tanks 121; the discharge channel 13 is arranged outside the tank body 12 and communicates with the inside of the tank body 12 for discharging the silicon material and acid solution inside the tank body 12. Specifically, a discharge valve 131 may be provided on the discharge channel 13 for controlling the opening and closing of the discharge channel 13; the acid inlet channel 14 is arranged outside the tank body 12 and communicates with the inside of the tank body 12 for conveying acid solution into the tank body 12. Specifically, an acid inlet valve 141 may be provided on the acid inlet channel 14 for controlling the opening and closing of the acid inlet channel 14. The discharge valve 131 and the acid inlet valve 141 may be connected to a controller to achieve automatic control; the first driving mechanism 15 is used to drive the tank body 12 to rotate relative to the base 11 so that the first direction X intersects with the horizontal direction, and the silicon material is discharged from the tank body 12 through the discharge channel 13 under the action of gravity.

[0023] The silicon material pickling equipment 10 of the present application includes a base 11 and a tank body 12 that are movably connected. The tank body 12 can be driven by a first driving mechanism 15 to switch between a horizontal state (as shown in Figure 3 shown) and an inclined state (as shown in Figure 4 shown) relative to the base 11. In the horizontal state, the silicon material can be laid flat in the tank body 12. On the one hand, it can be completely immersed in the acid solution to ensure the pickling and impurity removal effect; on the other hand, it makes the tank body 12 and the base 11 evenly stressed to ensure the reliability of the equipment. In the inclined state, the silicon material can quickly discharge from the discharge channel 13 out of the tank body 12 along the first direction X under the action of its own gravity and the flushing of the acid solution. The silicon material pickling equipment 10 of the present application further includes a plurality of cleaning tanks 121. When the channel between two adjacent cleaning tanks 121 is opened, the silicon material and the acid solution can flow between the cleaning tanks 121. When the channel is closed, each cleaning tank 121 can become an independent cleaning space. By controlling the opening and closing of single or multiple channels, it is possible to achieve partition cleaning and batch discharging, avoiding the blockage of the discharge channel 13 when a large amount of silicon material is discharged at the same time, and improving the efficiency of the pickling process.

[0024] In an application scenario, the pickling process of the present application can be carried out according to the following steps:

[0025] First, as shown in Figure 3 shown, the tank body 12 is kept in a horizontal state, the channels between all the cleaning tanks 121 are opened to connect all the cleaning tanks 121, and acid solution is introduced into the tank body 12 through the acid inlet channel 14 so that the silicon material is immersed in the acid solution.

[0026] Then, as shown in Figure 4 shown, the channels between all the cleaning tanks 121 are closed, the first driving mechanism 15 is activated to drive the tank body 12 to rotate to an inclined state, the acid inlet channel 14 and the discharge channel 13 are opened, and the silicon material in the bottommost cleaning tank 121 is discharged under the flushing of the acid solution and the action of gravity.

[0027] As shown in Figure 5 shown, after the silicon material in the bottommost cleaning tank 121 is emptied, the channel between the two bottommost cleaning tanks 121 is opened to discharge the silicon material in the second cleaning tank 121, and so on, discharging the silicon material in all the cleaning tanks 121 batch by batch from the bottom to the top in partitions.

[0028] Optionally, for the silicon material in the cleaning tanks 121 at higher positions, the channels between the cleaning tanks 121 can be opened successively from high to low, so that the silicon material gradually moves to the next cleaning tank 121 at a lower position, gradually reducing the height of the silicon material, reducing the drop of the silicon material each time it drops, reducing the impact caused by each drop, and reducing the probability of the silicon material and the acid solution overflowing.

[0029] Optionally, continue to refer to Figure 2, a separator 122 is provided between two adjacent cleaning tanks 121, and the separator 122 is used to separate two adjacent cleaning tanks 121; wherein, the separator 122 is slidably arranged in a sliding groove 123 on the inner side wall of the tank body 12, and the separator 122 slides in the tank body 12 under the drive of the second driving mechanism 16 to open or close the channel between two adjacent cleaning tanks 121. Specifically, the separator 122 can be in a rectangular plate-like structure. In the second direction Y perpendicular to the first direction X, its opposite two sides are respectively slidably arranged in the sliding grooves 123 on the two opposite inner side walls of the tank body 12, dividing the tank body 12 into a plurality of cleaning tanks 121. The second driving mechanism 16 can specifically be a cylinder, which is arranged on the two opposite outer side walls of the tank body 12, and the cylinders are arranged in one-to-one correspondence with the sliding grooves 123 and can drive the separator 122 to slide. The sliding groove 123 can extend along the depth direction of the tank body 12. When the separator 122 is driven by the cylinder to move away from the tank body 12, a channel connecting two adjacent cleaning tanks 121 is formed between the separator 122 and the bottom wall of the tank body 12, and the silicon material and the acid solution can move between the cleaning tanks 121 through the channel; when the separator 122 is driven by the cylinder to approach the tank body 12, the channel between the separator 122 and the bottom wall of the tank body 12 is closed, and the silicon material and the acid solution are confined in a single cleaning tank 121. In other embodiments, the sliding groove 123 can also be arranged on the side wall of the separator 122, and the inner side wall of the tank body 12 can be provided with protrusions adapted to the sliding groove 123, and the sliding connection between the separator 122 and the tank body 12 is realized through the cooperation between the protrusions and the sliding groove 123.

[0030] In other embodiments, the separator 122 can also be fixedly connected to the tank body 12, a through hole connecting two cleaning tanks 121 is arranged on the separator 122, and a valve (not shown in the figure) for covering the through hole is provided. The second driving mechanism 16 drives the valve to cover or open the through hole to realize the opening and closing of the channel. Alternatively, the separator 122 can be rotatably connected to the tank body 12, and by controlling the rotation angle of the separator 122, the opening and closing of the channel are realized.

[0031] Optionally, continue to refer to Figure 2 , the silicon material pickling device 10 further includes: a drainage channel 17 and a screen 124. The drainage channel 17 is arranged outside the tank body 12 and is communicated with the inside of the tank body 12 for draining the water inside the tank body 12. Specifically, a drainage valve 171 can be arranged on the drainage channel 17 for controlling the opening and closing of the drainage channel 17, and the drainage valve 171 can be connected to the controller; the screen 124 is arranged inside the tank body 12 and is located upstream of the drainage channel 17 for filtering the water entering the drainage channel 17.

[0032] In an application scenario, before the pickling process, the silicon material usually enters the tank 12 together with water. Before the pickling step, the water in the tank 12 needs to be drained. The screen 124 can block the drainage of the silicon material water and prevent the smaller silicon material particles from being drained out of the tank 12 together with the water during the drainage process.

[0033] Optionally, continue to refer to Figure 2 , there are slots 125 provided on the inner side wall of the tank 12. The opposite ends of the screen 124 are fixedly connected to the tank 12 through the slots 125. The screen 124 is inserted and matched with the slots 125, which is convenient for replacing and cleaning the screen 124. Specifically, the slots 125 are respectively arranged on the inner side walls of two adjacent tanks 12, and the screen 124 is arranged at the corner of the tank 12. The screen 124 and the two side walls enclose a triangular area. Since the screen 124 is inclined relative to the first direction X, during the discharging stage, the silicon material can gather along the screen 124 to the bottom near the discharging channel 13, further improving the discharging efficiency. The screen 124 of the present application divides the tank 12 into two areas, and the discharging channel 13 and the drainage channel 17 are respectively communicated with the two areas, ensuring that discharging and drainage are completely separated. In other embodiments, the screen 124 can also be of other shapes, such as arc-shaped, and its opposite ends can also be connected to the same inner side wall of the tank 12. The present application does not make specific limitations. Optionally, the number of the screens 124 can be multiple, preferably arranged in parallel to improve the filtering effect.

[0034] Optionally, continue to refer to Figure 2 , the number of the acid inlet channels 14 is multiple, and the multiple acid inlet channels 14 are arranged in one-to-one correspondence with the multiple cleaning tanks 121. The acid inlet channels 14 are communicated with the corresponding cleaning tanks 121. Each acid inlet channel 14 can be independently controlled to be opened and closed, so as to adjust the acid inlet position and the acid inlet amount.

[0035] In an application scenario, the pickling process of the present application can be carried out according to the following steps:

[0036] First, as Figure 3 shown, the tank 12 is kept in a horizontal state, and the second driving mechanism 16 drives all the isolation members (not shown in the figure) away from the bottom of the tank 12 to open the channels between the cleaning tanks 121, communicate all the cleaning tanks 121, and open all the acid inlet channels 14 to quickly introduce acid liquid into each cleaning tank 121 of the tank 12, so that the silicon material is immersed in the acid liquid.

[0037] Then, as Figure 4As shown, the second driving mechanism 16 drives all the partition members (not shown in the figure) to fit against the bottom of the tank body 12, so as to close the channels between all the cleaning tanks 121, and separate the silicon materials in multiple relatively independent cleaning tanks 121; the first driving mechanism 15 is activated to drive the tank body 12 to rotate to an inclined state, and the discharge channel 13 and the acid inlet channel 14 at the bottommost part are opened. Since all the cleaning tanks except the bottommost one are in a closed state at this time, only the silicon materials in the bottommost cleaning tank 121 are discharged under the flushing of the acid solution and the action of gravity.

[0038] As Figure 5 shown, after the silicon materials in the bottommost cleaning tank 121 are emptied, the second driving mechanism 16 drives the partition member at the bottommost part away from the bottom of the tank body 12, opens the channel between the two bottommost cleaning tanks 121, and opens the acid inlet valve 141 on the second acid inlet channel (counting up from the acid inlet channel at the bottom of the tank body) 14 to flush and discharge the silicon materials in the second cleaning tank 121. At this time, the bottommost acid inlet channel 14 can be opened or closed. And so on, the partition members 122 and the corresponding acid inlet channels 14 of the cleaning tanks 121 are sequentially opened in batches from the bottom to the top until all the silicon materials are discharged.

[0039] The above pickling process can save the amount of acid solution while ensuring that the silicon materials in each cleaning tank 121 can be quickly discharged. In other embodiments, multiple acid inlet channels 14 can also be correspondingly provided for each cleaning tank 121. For example, two acid inlet channels 14 are respectively provided on the opposite sides of each cleaning tank 121.

[0040] Optionally, continue to refer to Figure 3 and Figure 4 , the outer surface of the tank body 12 facing the base 11 is also connected with a first hinge member 111 and a second hinge member 112. The first hinge member 111 and the second hinge member 112 are arranged at intervals along the first direction X, and the second hinge member 112 is arranged on the side close to the discharge channel 13; the first driving mechanism 15 is movably connected to the base 11, and the output shaft of the first driving mechanism 15 is hinged to the first hinge member 111; the base 11 is hinged to the tank body 12 through the second hinge member 112. Specifically, the first driving mechanism 15 can be an electric cylinder, the electric cylinder can be connected to a controller, the piston rod of the electric cylinder is hinged to the first hinge member 111, and the end of the electric cylinder away from the piston can be hinged to the base 11. In the horizontal state, the electric cylinder is in a contracted state; in the inclined state, the electric cylinder is in an extended state, and the included angles between the electric cylinder and the base 11 and between the electric cylinder and the tank body 12 change, and the inclination angle of the tank body 12 is adjusted by adjusting the extension amplitude of the piston rod.

[0041] Optionally, continue to refer to Figure 3 and Figure 4, a spacer 113 is provided between the base 11 and the trough body 12, and the height of the spacer 113 is the same as that of the second hinge 112. The second hinge 112 increases the distance between one end of the trough body 12 and the base 11. By providing a spacer 113 with the same height as the second hinge 112 on the base 11, the horizontal state of the trough body 12 can be maintained. Multiple spacers 113 can be provided to ensure the stable support of the base 11 for the trough body 12. A buffer material can be provided on the surface of the spacer 113 to protect the trough body 12 and the base 11 when the trough body 12 descends and contacts the base 11.

[0042] Optionally, continue to refer to Figure 3 and Figure 4 , a vibrator 126 is fixedly connected to the outer surface of the trough body 12 facing the base 11. The vibrator 126 can be turned on when the trough body 12 is in an inclined state, and is used to drive the trough body 12 to vibrate, so that the silicon material can be quickly discharged from the trough body 12 under the action of vibration. Multiple vibrators 126 can be provided, specifically, they can be bin wall vibrators. In other embodiments, the vibrator 126 can also be provided on the side wall of the trough body 12 or be other forms of vibrators 126.

[0043] Optionally, the trough body 12 has an opening; the silicon material pickling equipment 10 further includes a cover plate 18, and the cover plate 18 is detachably connected to the trough body 12 for covering the opening. The cover plate 18 is used to enclose a closed cavity with the trough body 12, so that the silicon material and the acid solution are not easily spilled out of the trough body 12, reducing the volatilization of the acid solution and improving safety. Specifically, continue to refer to Figure 1 , the cover plate 18 can include a plurality of sub-cover plates 181, and the sub-cover plates 181 correspond to the cleaning troughs 121 one by one. There is a gap 182 between two adjacent sub-cover plates 181, and this gap 182 can allow the isolation member 122 to pass through, ensuring that the cover plate 18 always maintains a closed state with the trough body 12 during the movement of the isolation member 122.

[0044] Optionally, continue to refer to Figure 1 , the silicon material pickling equipment 10 further includes: a three-way rotary vibrating screen 132, which is located outside the trough body 12 and is communicated with the outlet end of the discharge channel 13. The discharge channel 13 is connected to the three-way rotary vibrating screen 132, and the solid-liquid separation of the silicon material and the acid solution can be realized. The separated solid silicon material is collected by the material bucket 133 as a product, and the separated acid solution enters the acid storage tank subsequently. The acid solution is pumped by a centrifugal pump or a diaphragm pump and then re-enters the trough body 12 through the acid inlet channel 14 to realize the recycling of the acid solution.

[0045] The equipment provided by this application is also applicable to the technical fields of solid purification such as minerals that require water washing, alkali washing, and acid washing.

[0046] The above are only the embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A silicon material pickling equipment, characterized in that: include: Base; A tank body, movably arranged on the base, provided with a plurality of cleaning tanks arranged along a first direction, and a passage that can be closed and opened is provided between two adjacent cleaning tanks; A discharge channel, disposed outside the tank body and communicating with the inside of the tank body, for discharging silicon material and acid liquid inside the tank body; An acid inlet channel, disposed outside the tank body and communicated with the interior of the tank body, for conveying acid solution into the tank body; The first driving mechanism is used to drive the trough body to rotate relative to the base so that the first direction intersects with the horizontal direction, so that the silicon material is discharged from the trough body through the discharge channel under the action of gravity.

2. The silicon material pickling equipment according to claim 1, characterized in that: An isolation piece is provided between two adjacent cleaning tanks, and the isolation piece is used to isolate the two adjacent cleaning tanks; Wherein, the isolating member is slidably arranged in a slide groove on the inner side wall of the tank body, and the isolating member slides in the tank body under the drive of the second driving mechanism to open or close the channel between two adjacent cleaning tanks.

3. The silicon material pickling equipment according to claim 1, characterized in that: The silicon material pickling equipment also includes: A drainage channel, disposed outside the tank body and communicating with the inside of the tank body, for draining water from the inside of the tank body; The screen is arranged inside the tank body and upstream of the drainage channel, and is used for filtering water entering the drainage channel.

4. The silicon material pickling equipment according to claim 3, characterized in that: A slot is provided on the inner side wall of the trough body, and opposite ends of the screen are fixedly connected to the trough body through the slot.

5. The silicon material pickling equipment according to claim 1, characterized in that: There are multiple acid inlet channels, and the multiple acid inlet channels are arranged in one-to-one correspondence with the multiple cleaning tanks. The acid inlet channels are connected to the corresponding cleaning tanks.

6. The silicon material pickling equipment according to claim 1, characterized in that: The outer surface of the trough body facing the base is also connected with a first hinge and a second hinge, the first hinge and the second hinge are arranged at intervals along the first direction, and the second hinge is arranged on a side of the first hinge close to the discharge channel; The first driving mechanism is movably connected to the base, and the output shaft of the first driving mechanism is hinged to the first hinge; The base is hinged to the trough body through the second hinge.

7. The silicon material pickling equipment according to claim 6, characterized in that: A cushion block is provided between the base and the trough body, and the height of the cushion block is the same as the height of the second hinge.

8. The silicon material pickling equipment according to claim 1, characterized in that: A vibrator is fixedly connected to the outer surface of the trough body facing the base.

9. The silicon material pickling equipment according to claim 6, characterized in that: The tank body has an opening; The silicon material pickling equipment also includes a cover plate, which is detachably connected to the tank body and is used to seal the opening.

10. The silicon material pickling equipment according to claim 1, characterized in that: Also includes: The three-dimensional rotary vibrating screen is located outside the tank body and is connected to the outlet end of the discharge channel.

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