Circulating water treatment device for silicon-chromium alloy production

Abstract

The utility model provides a circulating water treatment device for silicon-chromium alloy production. The circulating water treatment device comprises a softened water tank, a cooler, to-be-cooled equipment for silicon-chromium alloy production, a first circulating water filter, a circulating water treatment tank and a sedimentation tank which are sequentially communicated through a first pipeline, the softened water tank is communicated with a water supplementing pipe for introducing soft water into the softened water tank, and the water supplementing pipe is provided with a first electromagnetic valve; a power supply is arranged on the outer side wall of the circulating water treatment tank, and an anode plate and a cathode plate which are electrically connected with an anode and a cathode of the power supply respectively are arranged in the circulating water treatment tank; a water outlet of the sedimentation tank is communicated with the water supplementing pipe between the first electromagnetic valve and the softened water tank through a second pipeline; a circulating water pump is arranged on the first pipeline between the cooler and the to-be-cooled equipment for silicon-chromium alloy production; and the control device is used for controlling the operation process of the circulating water treatment device for silicon-chromium alloy production. According to the application, the secondary pollution in the cooling soft water recycling process is avoided, and the discharge treatment cost after the cooling soft water is recycled is reduced.

Description

Technical Field

[0001] This application relates to the field of silicon-chromium alloy production technology, and in particular to a circulating water treatment device for silicon-chromium alloy production. Background Technology

[0002] In the production process of silicon-chromium alloys, especially in the electric furnace smelting stage, it is necessary to cool the equipment used in the production of silicon-chromium alloys (such as electric arc furnaces, transformers, air compressor stations, etc.). The cooling method usually involves circulating cooling water to exchange heat with the above-mentioned equipment to cool the equipment and ensure its normal operation.

[0003] However, during the heat exchange process between the circulating cooling water and the aforementioned cooling equipment, hardness ions such as calcium and magnesium ions are commonly present in natural water or tap water. Therefore, as the temperature of the circulating cooling water rises during the cooling process, the water evaporates, causing the concentration of these hardness ions to gradually increase, leading to increased hardness. This increased hardness can cause scale buildup in the pipes the circulating cooling water flows through, thus affecting its cooling effect on the equipment. Currently, the most mature or common industrial process for reducing the hardness of circulating cooling water is the use of chemical reagents. This involves adding inorganic or organic substances to slow down or prevent scale formation or decompose scale, thereby reducing the hardness of the circulating cooling water. However, the use of chemical reagents can cause secondary pollution to the water body, requiring purification treatment before direct discharge, thus increasing the treatment cost of circulating cooling water discharge. Utility Model Content

[0004] This application provides a circulating water treatment device for silicon-chromium alloy production to solve the technical problems described in the background art.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] This application provides a circulating water treatment device for silicon-chromium alloy production, comprising: a soft water tank, a cooler, a cooling device for silicon-chromium alloy production, a first circulating water filter, a circulating water treatment tank, and a sedimentation tank, which are connected in sequence through a first pipeline.

[0007] The soft water tank is connected to a water supply pipe for introducing soft water into it, and a first solenoid valve is installed on the water supply pipe.

[0008] A power source is installed on the outer wall of the circulating water treatment tank, and an anode plate and a cathode plate are installed inside the tank, which are respectively electrically connected to the positive and negative terminals of the power source.

[0009] The outlet of the sedimentation tank is connected to the water supply pipe between the first solenoid valve and the soft water tank via a second pipe. A circulating water pump is installed on the first pipe between the cooler and the equipment to be cooled for silicon-chromium alloy production.

[0010] A control device is used to control the operation of a circulating water treatment device for silicon-chromium alloy production.

[0011] Optionally, the circulating water treatment tank is equipped with two porous dispersion plates;

[0012] One of the porous dispersion plates is disposed in the circulating water treatment tank near the anode plate and a first scale collection screen is provided on its side wall near the anode plate; the other porous dispersion plate is disposed in the circulating water treatment tank near the cathode plate and a second scale collection screen is provided on its side wall near the cathode plate.

[0013] The first scale collection mesh carries a positive charge, while the second scale collection mesh carries a negative charge.

[0014] Optionally, an overflow plate is vertically provided on the inner bottom surface of the sedimentation tank, and the overflow plate divides the sedimentation tank into a first space for containing circulating water flowing out of the circulating water treatment tank and a second space for containing circulating water overflowing from the first space.

[0015] The height of the overflow plate is 0.8 to 0.85 times the height of the sedimentation tank.

[0016] Optionally, a drain pipe is connected to the bottom of the first space, and a second solenoid valve electrically connected to the control device is installed on the drain pipe.

[0017] Optionally, the circulating water treatment device for silicon-chromium alloy production in this application further includes a second circulating water filter;

[0018] The inlet of the second circulating water filter is connected to the end of the second pipe away from the sedimentation tank, and the outlet of the second circulating water filter is connected to the water supply pipe between the first solenoid valve and the soft water tank through a third pipe.

[0019] Optionally, the circulating water treatment device for silicon-chromium alloy production in this application also includes a cation exchanger;

[0020] The inlet of the cation exchanger is connected to the end of the third pipe away from the second circulating water filter, and its outlet is connected to the water supply pipe between the first solenoid valve and the soft water tank through the fourth pipe.

[0021] Optionally, a liquid level sensor is installed inside the soft water tank, and the liquid level sensor is electrically connected to the control device.

[0022] Optionally, the top of the circulating water treatment tank is sealed with a cleaning door.

[0023] The circulating water treatment device for silicon-chromium alloy production provided in this application introduces soft water into a soft water tank through a water supply pipe. A cooler then cools the soft water entering the tank, producing cooled soft water. This cooled soft water enters the silicon-chromium alloy production equipment to be cooled, resulting in heated cooled soft water. The heated cooled soft water then enters a first circulating water filter to remove impurities. Anions (e.g., hydroxide ions) generated by ionization at the cathode plate in the circulating water treatment tank cause calcium and magnesium ions, among other hardness ions, in the heated and filtered soft water to precipitate calcium carbonate and magnesium hydroxide at the negative electrode of the cathode plate. The treated soft water then enters a sedimentation tank. The supernatant water from the sedimentation tank enters a cooler, is cooled, and then enters the silicon-chromium alloy production equipment to cool it, thus achieving the recycling of the cooled soft water. Compared to existing methods that add chemical reagents to circulating cooling water to reduce hardness, this application uses a first circulating water filter, a cathode plate in the circulating water treatment tank, and a sedimentation tank to sequentially treat hardness ions during the cooling water recycling process, thereby reducing the hardness of the cooling water during recycling. This avoids secondary pollution during the cooling water recycling process, allowing the circulating cooling water to be discharged directly without secondary treatment, thus reducing the discharge treatment cost of the recycled cooling water. Attached Figure Description

[0024] 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 or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of a circulating water treatment device for silicon-chromium alloy production provided in an embodiment of this application;

[0026] Figure 2 A schematic diagram of a circulating water treatment device for silicon-chromium alloy production provided in another embodiment of this application;

[0027] Figure 3 A schematic diagram of a circulating water treatment device for silicon-chromium alloy production provided in another embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the internal structure of a sedimentation tank provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the structure of a circulating water treatment tank provided in one embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the internal structure of a circulating water treatment tank provided in an embodiment of this application;

[0031] Figure 7 This is a schematic diagram showing the electrical connections between the control device and its components, as provided in another embodiment of this application.

[0032] In the diagram: 101, First pipe; 1011, Circulating water pump; 102, Second pipe; 103, Sewage pipe; 1031, Second solenoid valve; 104, Third pipe; 105, Fourth pipe; 200, Soft water tank; 201, Water supply pipe; 2011, First solenoid valve; 202, Liquid level sensor; 300, Cooler; 400, Cooling equipment for silicon-chromium alloy production; 500, First circulating water filter; 600, Circulating water treatment tank; 601, Power supply; 602, Anode plate; 603, Cathode plate; 604, Porous dispersion plate; 605, First scale collection screen; 606, Second scale collection screen; 607, Cleaning door; 700, Sedimentation tank; 701, Overflow plate; 702, First space; 703, Second space; 800, Control device; 900, Second circulating water filter; 1000, Cation exchanger. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0034] refer to Figures 1 to 7This application provides a circulating water treatment device for silicon-chromium alloy production, comprising: a soft water tank 200, a cooler 300, a cooling device 400 for silicon-chromium alloy production, a first circulating water filter 500, a circulating water treatment tank 600, and a sedimentation tank 700, which are sequentially connected through a first pipe 101; wherein, the circulating water filter 500 is a device that uses a filter screen to directly intercept impurities in the water, remove suspended solids and particulate matter, reduce turbidity, purify water quality, and reduce the generation of system dirt, algae, rust, etc., so as to purify the water quality for reuse. Water enters the self-cleaning filter body through the inlet. Due to the intelligent design (PLC, PAC), the system can automatically identify the degree of impurity deposition and send a signal to the drain valve to automatically discharge sewage. The first circulating water filter 500 used in this application is an XF-F series filter manufactured by Wuxi Innote Filtration Systems Co., Ltd. Because rust and other substances may exist in the heat exchange pipes of the cooling equipment 400 used in silicon-chromium alloy production, they may enter the circulating water treatment tank 600 along with the soft water. The first circulating water filter 500 removes impurities from the circulating cooling soft water entering the tank to prevent blockages in the pipes. Furthermore, the cooling equipment 400 used in silicon-chromium alloy production can be any equipment requiring cooling, such as a submerged arc furnace, transformer, or air compressor station, used in the silicon-chromium alloy production process.

[0035] The soft water tank 200 is connected to a water supply pipe 201 for introducing soft water into it. A first solenoid valve 2011 is installed on the water supply pipe 201. In the initial state, a certain amount of soft water is introduced into the soft water tank 200 through the water supply pipe 201. Soft water refers to water containing fewer soluble calcium and magnesium ions, typically with a total hardness below a certain standard (such as 8°dH or 150 mg / L calcium carbonate). The sources of soft water mainly include natural water sources and treated water.

[0036] A power supply 601 is installed on the outer wall of the circulating water treatment tank 600, and an anode plate 602 and a cathode plate 603 are respectively electrically connected to the positive and negative terminals of the power supply 601. After water enters the circulating water treatment tank 600 and undergoes electrolysis, a large number of hydroxide ions accumulate near the cathode plate 603, as shown below:

[0037] 2H2O+4e - +O2→4OH - (1)

[0038] 2H2O+2e - →2OH - +H2↑(2)

[0039] The generated OH - An alkaline region forms near the cathode plate 603, increasing the solubility of CO2 in the soft water within the circulating water treatment tank 600, and also increasing the OH content. -It will react with CO2 dissolved in soft water as follows:

[0040] CO2 + OH - →HCO3 - (3)

[0041] HCO3 - +OH - →H2O+CO3 2- (4)

[0042] As can be seen from the above, during the electrolysis reaction in the circulating water treatment tank 600, hardness ions such as calcium and magnesium ions in the soft water entering the circulating water treatment tank 600 will migrate towards the cathode plate 603 and react with hydroxide and carbonate ions that accumulate near the cathode plate 603 to produce precipitates, as detailed below:

[0043] CO3 2- +Ca 2+ →CaCO3↓(5)

[0044] 2OH - +Mg 2+ →Mg(OH)2↓(6)

[0045] The outlet of the sedimentation tank 700 is connected to the water supply pipe 201 between the first solenoid valve 2011 and the soft water tank 200 via the second pipe 102. A circulating water pump 1011 is installed on the first pipe 101 between the cooler 300 and the equipment to be cooled for silicon-chromium alloy production 400. Since the calcium carbonate and magnesium hydroxide precipitates generated in the circulating water treatment tank 600 may enter the cooler 300 and various pipes with the softened water and cause blockage, the sedimentation tank 700 plays a role in settling the above-mentioned precipitates so that the clear liquid in the sedimentation tank 700 enters the soft water tank 200, thereby reducing the hardness of the soft water entering the soft water tank 200.

[0046] Control device 800 is used to control the operation of the circulating water treatment device for silicon-chromium alloy production. In this application, the control device is an electrical control device, which is generally referred to as a secondary control circuit for electrical equipment. Different equipment has different control circuits, and the control methods for high-voltage and low-voltage electrical equipment also differ. Specifically, an electrical control system refers to a combination of several electrical components used to control one or more objects, thereby ensuring the safe and reliable operation of the controlled equipment. Its main functions include automatic control, protection, monitoring, and measurement. The control process and specific structure of control device 800 are not the inventive point of this application and are all prior art; please refer to existing electrical control devices for details. Therefore, this application will not specifically describe its control device 800 here. The first solenoid valve 2011 and the circulating water pump 1011 are both electrically connected to control device 800, that is, the control device 800 controls the on / off state of the first solenoid valve 2011 and the circulating water pump 1011, improving the efficiency and convenience of the circulating water treatment process for silicon-chromium alloy production.

[0047] The circulating water treatment device for silicon-chromium alloy production provided in this application introduces soft water into a soft water tank 200 through a water supply pipe 201. A cooler 300 cools the soft water entering from the soft water tank 200 to obtain cooled soft water. This cooled soft water then enters the equipment 400 to be cooled in silicon-chromium alloy production and is further cooled to obtain heated cooled soft water. The heated cooled soft water then enters a first circulating water filter 500 to filter out impurities and other contaminants. Finally, it passes through a cathode plate 6 in a circulating water treatment tank 600. The anions generated by ionization (e.g., hydroxide ions) cause hardness ions such as calcium and magnesium ions in the softened water after heating and filtration to precipitate as calcium carbonate and magnesium hydroxide at the negative electrode of the cathode plate 603. The softened water treated by the circulating water treatment tank 600 enters the sedimentation tank 700. The upper layer of water after sedimentation in the sedimentation tank 700 enters the cooler 300. After being cooled by the cooler 300, it enters the silicon-chromium alloy production cooling equipment 400 to cool the silicon-chromium alloy production cooling equipment 400, thereby realizing the recycling of cooling soft water. Compared with the existing method of adding chemical reagents to circulating cooling water to reduce hardness, this application uses the first circulating water filter 500, the cathode plate 603 in the circulating water treatment tank 600, and the sedimentation tank 700 to sequentially treat the hardness ions in the cooling soft water recycling process, thereby reducing the hardness of the cooling soft water during recycling. This avoids secondary pollution in the cooling soft water recycling process, allowing the cooling soft water to be discharged directly without secondary treatment after recycling, thus reducing the discharge treatment cost of the recycled cooling soft water.

[0048] In some embodiments, reference Figure 6In this application, the circulating water treatment tank 600 is provided with two porous dispersion plates 604. Specifically, one porous dispersion plate 604 is located near the anode plate 602 inside the circulating water treatment tank 600, and a first scale collection screen 605 is provided on its side wall near the anode plate 602. The other porous dispersion plate 604 is located near the cathode plate 603 inside the circulating water treatment tank 600, and a second scale collection screen 606 is provided on its side wall near the cathode plate 603. The two porous dispersion plates 604 and the inner wall of the circulating water treatment tank 600 form a third space, and the first circulating water filter 500 and the first pipe 101 that are connected to the circulating water treatment tank 600 are connected to the third space. This allows the water entering the third space to contact the anode plate 602 and the cathode plate 603 evenly through the holes on the porous dispersion plates 604.

[0049] The first scale collection screen 605 carries a positive charge, while the second scale collection screen 606 carries a negative charge. Furthermore, both the first and second scale collection screens 605 and 606 are fixedly connected to their corresponding porous dispersion plates 604. The positively charged first scale collection screen 605 allows negative ions in the soft water within the circulating water treatment tank 600 to rapidly migrate towards the anode plate 602, while positive ions (calcium ions, magnesium ions, and other hardness ions) in the soft water within the circulating water treatment tank 600 rapidly migrate towards the cathode plate 603. This accelerates the formation of magnesium hydroxide and calcium carbonate, reducing the hardness of the soft water in the circulating water treatment tank 600.

[0050] In some embodiments, reference Figure 6 In this application, the sedimentation tank 700 has an overflow plate 701 vertically installed on its inner bottom surface. The overflow plate 701 divides the sedimentation tank 700 into a first space 702 for receiving circulating water flowing out of the circulating water treatment tank 600 and a second space 703 for receiving circulating water overflowing from the first space 702. The overflow plate 701 is designed to allow the soft water entering the first space 702 to settle first, and the supernatant after sedimentation overflows into the second space 703 through the overflow plate 701. The purpose is to reduce the hardness of the water entering the soft water tank 200 and the amount of sediment.

[0051] The height of the overflow plate 701 is 0.8 to 0.85 times the height of the sedimentation tank 700. This ensures that impurities in the soft water entering the first space 702 are deposited at the bottom of the first space 702, while the clear liquid on top overflows into the second space 703 via the overflow plate 701. If the overflow plate 701 is too high, the overflow rate of water from the first space 702 to the second space 703 will be slowed, affecting the cooling effect of the silicon-chromium alloy production cooling equipment 400. If the overflow plate 701 is too low, the soft water in the first space 702 may not settle in time and overflow into the second space 703 via the overflow plate 701, resulting in a higher sediment content in the soft water entering the second space 703. Therefore, the overflow plate 701 needs to be within a suitable height range. Within the above-mentioned range, the overflow plate 701 can not only ensure the rate at which soft water from the first space 702 enters the second space 703, but also ensure the cooling effect of the circulating cooling soft water on the silicon-chromium alloy production cooling equipment 400.

[0052] In some embodiments, reference Figure 1 , Figure 2 and Figure 3 In this application, the bottom of the first space 702 is connected to a drain pipe 103, and a second solenoid valve 1031 electrically connected to the control device 800 is provided on the drain pipe 103.

[0053] In the above embodiments, the extended silicon-chromium alloy production process and the continuous cooling process of the cooling soft water on the silicon-chromium alloy production cooling equipment 400 result in a greater amount of sediment deposited at the bottom of the first space 702. In order to ensure that the first space 702 has sufficient capacity to accommodate the soft water entering it, it is necessary to periodically remove the sediment at the bottom of the first space 702. The specific removal process is achieved by the control device 800 opening the second solenoid valve 1031, so that the sediment at the bottom of the first space 702 is discharged from the drain pipe 103 to the outside of the first space 702.

[0054] In some embodiments, reference Figure 2 The circulating water treatment device for silicon-chromium alloy production in this application also includes a second circulating water filter 900. Specifically, the inlet of the second circulating water filter 900 is connected to the end of the second pipe 102 away from the sedimentation tank 700, and the outlet of the second circulating water filter 900 is connected to the water supply pipe 201 between the first solenoid valve 2011 and the soft water tank 200 through the third pipe 104. The second circulating water filter 900 in this application is also an XF-F series filter manufactured by Wuxi Innote Filtration Systems Co., Ltd.

[0055] In the above embodiment, if the sedimentation in the sedimentation tank 700 is incomplete, some calcium carbonate and calcium carbonate precipitate in the sedimentation tank 700 will enter the soft water tank 200 from the sedimentation tank. In order to avoid clogging of the cooler 300 and various pipes, the water coming out of the sedimentation tank 700 is filtered by the second circulating water filter 900 before being introduced into the soft water tank 200, thereby reducing the hardness of the water in the soft water tank 200 and the risk of clogging of the cooler 300 and various pipes.

[0056] In some embodiments, reference Figure 3 The circulating water treatment device for silicon-chromium alloy production in this application also includes a cation exchanger 1000. Specifically, the inlet of the cation exchanger 1000 is connected to the end of the third pipe 104 away from the second circulating water filter 900, and its outlet is connected to the water supply pipe 201 between the first solenoid valve 2011 and the soft water tank 200 via the fourth pipe 105. The cation exchanger 1000 used in this application is a LBHB-6.0D / 500 cation exchanger manufactured by Hangzhou Lanbing Environmental Protection Technology Co., Ltd.

[0057] In the above embodiment, the cation exchanger 1000 continues to capture hardness ions such as calcium and magnesium ions in the soft water entering from the second circulating water filter 900, which greatly reduces the content of hardness ions in the soft water entering the soft water tank 200 from the cation exchanger 1000, and further reduces the hardness of the circulating cooling soft water.

[0058] In some embodiments, reference Figure 7 The soft water tank 200 in this application is equipped with a liquid level sensor 202, which is electrically connected to the control device 800.

[0059] In the above embodiment, as the soft water initially introduced into the soft water tank 200 may evaporate due to the temperature rise during the circulation and cooling of the silicon-chromium alloy production cooling equipment 400, the amount of recycled soft water may decrease. In order to ensure the cooling effect of the cooling soft water on the silicon-chromium alloy production cooling equipment 400, the liquid level sensor 202 detects the liquid level in the soft water tank 200. When the liquid level sensor 202 detects that the liquid level in the soft water tank 200 is lower than the minimum liquid level threshold (which is set according to the actual situation, and this application does not specifically limit it), the detected signal is transmitted to the control device 800. The control device 800 opens the first solenoid valve 2011 to replenish the soft water tank 200 until the liquid level sensor 202 detects that the liquid level in the soft water tank 200 is greater than or equal to the minimum liquid level threshold.

[0060] In some embodiments, reference Figure 4The top of the circulating water treatment tank 600 in this application is sealed with a cleaning door 607.

[0061] In the above embodiments, after the circulating water treatment tank 600 has been working for a period of time, a large amount of sediment will be generated in and around the cathode plate 603 in the circulating water treatment tank 600. In order to ensure the normal operation of the cathode plate 603, the magnesium hydroxide and calcium carbonate sediments attached to the cathode plate 603 can be cleaned by opening the cleaning door 607 to ensure the working efficiency of the cathode plate 603.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A circulating water treatment device for silicon-chromium alloy production, characterized in that, include: The soft water tank (200), cooler (300), cooling equipment for silicon-chromium alloy production (400), first circulating water filter (500), circulating water treatment tank (600) and sedimentation tank (700) are connected in sequence through the first pipe (101). The soft water tank (200) is connected to a water supply pipe (201) for supplying soft water into it, and a first solenoid valve (2011) is installed on the water supply pipe (201). A power supply (601) is provided on the outer wall of the circulating water treatment tank (600), and an anode plate (602) and a cathode plate (603) are respectively electrically connected to the positive and negative terminals of the power supply (601). The outlet of the sedimentation tank (700) is connected to the water supply pipe (201) between the first solenoid valve (2011) and the soft water tank (200) through the second pipe (102). A circulating water pump (1011) is installed on the first pipe (101) between the cooler (300) and the equipment to be cooled for silicon-chromium alloy production (400). A control device (800) is used to control the operation of a circulating water treatment device for silicon-chromium alloy production.

2. The circulating water treatment device for silicon-chromium alloy production according to claim 1, characterized in that, The circulating water treatment tank (600) is equipped with two porous dispersion plates (604); One of the porous dispersion plates (604) is disposed in the circulating water treatment tank (600) near the anode plate (602) and a first scale collection screen (605) is provided on its side wall near the anode plate (602); the other porous dispersion plate (604) is disposed in the circulating water treatment tank (600) near the cathode plate (603) and a second scale collection screen (606) is provided on its side wall near the cathode plate (603). The first scale collection mesh (605) carries a positive charge, and the second scale collection mesh (606) carries a negative charge.

3. The circulating water treatment device for silicon-chromium alloy production according to claim 1, characterized in that, An overflow plate (701) is vertically provided on the inner bottom surface of the sedimentation tank (700). The overflow plate (701) divides the sedimentation tank (700) into a first space (702) for containing circulating water flowing out of the circulating water treatment tank (600) and a second space (703) for containing circulating water overflowing from the first space (702). The height of the overflow plate (701) is 0.8 to 0.85 times the height of the sedimentation tank (700).

4. The circulating water treatment device for silicon-chromium alloy production according to claim 3, characterized in that, The bottom of the first space (702) is connected to a drain pipe (103), and a second solenoid valve (1031) electrically connected to the control device (800) is provided on the drain pipe (103).

5. The circulating water treatment device for silicon-chromium alloy production according to claim 3, characterized in that, It also includes a second circulating water filter (900); The inlet of the second circulating water filter (900) is connected to the end of the second pipe (102) away from the sedimentation tank (700), and the outlet of the second circulating water filter (900) is connected to the water supply pipe (201) between the first solenoid valve (2011) and the soft water tank (200) through the third pipe (104).

6. The circulating water treatment device for silicon-chromium alloy production according to claim 5, characterized in that, It also includes a cation exchanger (1000); The inlet of the cation exchanger (1000) is connected to the end of the third pipe (104) away from the second circulating water filter (900), and its outlet is connected to the water supply pipe (201) between the first solenoid valve (2011) and the soft water tank (200) through the fourth pipe (105).

7. The circulating water treatment device for silicon-chromium alloy production according to any one of claims 1 to 6, characterized in that, The soft water tank (200) is equipped with a liquid level sensor (202), which is electrically connected to the control device (800).

8. The circulating water treatment device for silicon-chromium alloy production according to any one of claims 1 to 6, characterized in that, The top of the circulating water treatment tank (600) is sealed with a cleaning door (607).

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