Permanent magnet slurry de-ironing separator for self-cleaning pipeline

Abstract

The invention provides a self-cleaning pipeline permanent magnet slurry de-ironing separator, and belongs to the technical field of slurry de-ironing separators. The device structurally comprises a first iron removal chamber and a second iron removal chamber, each of the first iron removal chamber and the second iron removal chamber comprises a magnetic bar pipe sleeve, an air cylinder and a magnetic bar, the magnetic bar pipe sleeves are fixedly connected in the iron removal chambers, the air cylinders are arranged in the iron removal chambers, the magnetic bars are connected to the free ends of the air cylinders, and the movement stroke of the magnetic bars is located in the magnetic bar pipe sleeves; and the feeding hole, the clean material outlet, the material return hole, the cleaning water inlet and the slag material outlet are respectively connected to the 1 # iron removal chamber and the 2 # iron removal chamber through pipelines. The two magnetic separation chambers are adopted to work alternately, and continuous iron removal of slurry in the pipeline can be achieved; and moreover, multi-stage series connection can be realized, so that a more ideal iron removal effect is achieved. The equipment has the advantages of compact structure, convenience in installation, simplicity in maintenance, automatic control in the whole process, uninterrupted continuous work, no need of manual guarding, capability of being used in a multi-stage series connection manner and the like.

Description

Technical Field

[0001] The invention relates to the technical field of slurry iron removers, in particular to a self-cleaning pipeline permanent magnetic slurry iron remover. Background Art

[0002] A slurry iron remover is a device that separates ferromagnetic impurities (such as iron nails, iron filings, stainless steel particles, etc.) from fluid or semi-fluid materials (such as pulp, glaze, food slurry, etc.) through the action of a magnetic field. Its core function is to protect downstream equipment (such as grinders, pumps) from damage by metal impurities while improving the quality of the final product.

[0003] In the prior art, conventional slurry iron removers have the following technical problems: 1. In the past, the iron removers on the market could not work continuously and uninterruptedly. After working for a period of time, they had to be shut down to clean up the ferromagnetic impurities, which was difficult, time-consuming and laborious. Specifically, in the process of iron selection and iron removal, the previous pipeline permanent magnetic slurry iron removers had to stop the slurry transportation after working for a period of time, and then open the flange cover to manually clean up the ferromagnetic impurities, which was labor-intensive and labor-intensive. If not careful, it might cause damage to the magnetically adsorbed iron parts. Generally, multiple units were prepared as spare parts, resulting in unnecessary waste. 2. There is no slurry iron removal equipment that can be operated automatically and unattended in the prior art. 3. Conventional iron removers are difficult to remove iron from slurry inside pressurized pipelines. 4. The processing capacity of conventional iron removers is fixed, and it is impossible to modularly enlarge it according to process requirements. 5. In order to achieve a better iron removal effect, the energy consumption of some electromagnetic slurry iron removers is currently too high. Summary of the invention

[0004] The present invention aims to provide a self-cleaning pipeline permanent magnetic slurry iron remover to address the technical defects of the prior art and solve the technical problems pointed out in the above background technology.

[0005] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A self-cleaning pipeline permanent magnetic slurry iron remover comprises a 1# iron removal chamber, a 2# iron removal chamber, a feed inlet, a clean material outlet, a return material inlet, a cleaning water inlet, and a slag outlet, wherein the 1# iron removal chamber and the 2# iron removal chamber each comprise a magnetic rod sleeve, a cylinder, and a magnetic rod, wherein the magnetic rod sleeve is fixedly connected to the interior of the iron removal chamber, the cylinder is arranged inside the iron removal chamber, the magnetic rod is connected to the free end of the cylinder, and the movement stroke of the magnetic rod is located inside the magnetic rod sleeve; the feed inlet is connected to the 1# iron removal chamber and the 2# iron removal chamber respectively through pipelines, the clean material outlet is connected to the 1# iron removal chamber and the 2# iron removal chamber respectively through pipelines, the return material inlet is connected to the 1# iron removal chamber and the 2# iron removal chamber respectively through pipelines, the cleaning water inlet is connected to the 1# iron removal chamber and the 2# iron removal chamber respectively through pipelines, and the slag outlet is connected to the 1# iron removal chamber and the 2# iron removal chamber respectively through pipelines.

[0006] Preferably, the pipeline includes a main pipe connected to the port and branch pipes connected to the 1# iron removal chamber and the 2# iron removal chamber. The main pipe and the two branch pipes are connected by a tee, and a three-way valve is provided at the tee. The port includes a feed port, a clean material outlet, a return material port, a cleaning water inlet, and a slag outlet.

[0007] Preferably, the pipeline connected to the return material port and the pipeline connected to the slag material outlet share the same two branch pipes.

[0008] Preferably, a pneumatic ball valve is provided on the pipeline.

[0009] Preferably, the feed inlet and clean material outlet connected to the 1# iron removal chamber or the 2# iron removal chamber constitute a slurry iron removal passage; the return material port connected to the 1# iron removal chamber or the 2# iron removal chamber serves as a reflux passage for the residual slurry before cleaning the iron removal chamber; the cleaning water inlet and slag outlet connected to the 1# iron removal chamber or the 2# iron removal chamber constitute a cleaning passage.

[0010] On the basis of the above technical scheme, the present invention further provides a method for slurry iron removal using the above-mentioned self-cleaning pipeline permanent magnetic slurry iron remover, in which the operating states of the 1# iron removal chamber and the 2# iron removal chamber each include an iron removal state and a cleaning state; when in the iron removal state, the slurry enters the iron removal chamber through the feed port, and is discharged from the clean material outlet after being adsorbed by the magnetic rod; when in the cleaning state, the clean material outlet and the feed port are first closed and the return port is opened, so that the slurry remaining in the iron removal chamber is discharged through the return port, and then the return port is closed, and the cleaning water inlet and the slag outlet are opened, so that the cleaning water carrying iron debris is discharged through the slag outlet.

[0011] Preferably, when the 1# iron removal chamber is in the iron removal state, the 2# iron removal chamber is in the cleaning state; when the 2# iron removal chamber is in the iron removal state, the 1# iron removal chamber is in the cleaning state.

[0012] The working principle of the present invention is as follows: the slurry to be separated enters the permanent magnetic iron removal chamber through the feed port, and the ferromagnetic impurities in the slurry are adsorbed by multiple groups of high-field strength permanent magnetic rods, and then the ferromagnetic impurities adsorbed on the magnetic rod sleeve are separated in the iron removal chamber by the pulling of the cylinder, and finally the iron impurities are discharged from the slag outlet through the flushing effect of cleaning water.

[0013] The present invention is an energy-saving iron removal equipment with continuous operation, automatic operation, high field strength and high gradient. It can be widely used in the process of removing ferromagnetic impurities in slurry in industries such as new energy raw materials, rare metals, and glass. Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention realizes continuous operation by alternating the operation of two iron removal chambers, and fully realizes the automatic cleaning of ferromagnetic impurities adsorbed on the surface of the magnetic rod, and realizes the function of automatic iron discharge through the slag outlet, saving time and labor. 2. The present invention can be equipped with a PLC control box, and after the debugging of each operating parameter is completed, unattended full-automatic operation can be realized. 3. Due to the cooperation of the magnetic rod's iron absorption or iron discharge with each pneumatic ball valve, and the full closure of the equipment, the iron removal of the slurry inside the pressurized pipeline can be fully realized, filling the gap in the iron removal of slurry in this field. 4. The present invention can be connected in series in multiple stages, so as to expand its processing capacity according to the process requirements, so as to achieve a more ideal iron removal effect. 5. The magnetic induction intensity of the working area of ​​the present invention can reach 12000Gs, which can replace some high-energy-consuming electromagnetic slurry iron removers on the existing market. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view of the present invention; Figure 2 It is a right side view of the present invention; Figure 3 It is a left side view of the present invention; Figure 4 It is a left view of the present invention after removing part of the external structure of the 2# iron removal chamber; Figure 5 is a top view of the present invention; Figure 6 is a stereogram of the present invention; Figure 7 It is a control interface diagram of the present invention; In the figure: DETAILED DESCRIPTION

[0015] The specific embodiments of the present invention will be described in detail below. In order to avoid too much unnecessary details, the well-known structures or functions will not be described in detail in the following examples. The approximate language used in the following examples can be used for quantitative expression, indicating that the quantity can be allowed to have a certain change without changing the basic function. Unless otherwise defined, the technical and scientific terms used in the following examples have the same meaning as those generally understood by those skilled in the art to which the present invention belongs.

[0016] Self-cleaning pipeline permanent magnetic slurry iron remover, such as Figure 1 to Figure 6As shown, it includes 1# iron removal chamber 1, 2# iron removal chamber 2, feed port 6, clean material outlet 7, return port 8, cleaning water inlet 9, and slag outlet 10, wherein 1# iron removal chamber 1 and 2# iron removal chamber 2 each include a magnetic rod sleeve 3, a cylinder 4, and a magnetic rod 5, the magnetic rod sleeve 3 is fixedly connected to the inside of the iron removal chamber, the cylinder 4 is arranged inside the iron removal chamber, the magnetic rod 5 is connected to the free end of the cylinder 4, and the movement stroke of the magnetic rod 5 is located inside the magnetic rod sleeve 3; the feed port 6 is connected to 1# iron removal chamber 1 and 2# iron removal chamber 2 respectively through pipelines, the clean material outlet 7 is connected to 1# iron removal chamber 1 and 2# iron removal chamber 2 respectively through pipelines, the return port 8 is connected to 1# iron removal chamber 1 and 2# iron removal chamber 2 respectively through pipelines, the cleaning water inlet 9 is connected to 1# iron removal chamber 1 and 2# iron removal chamber 2 respectively through pipelines, and the slag outlet 10 is connected to 1# iron removal chamber 1 and 2# iron removal chamber 2 respectively through pipelines.

[0017] The pipeline includes a main pipe connected to the port and branch pipes connected to the 1# iron removal chamber 1 and the 2# iron removal chamber 2. The main pipe and the two branch pipes are connected by a tee, and a three-way valve is provided at the tee. The port includes a feed port 6, a clean material outlet 7, a return port 8, a cleaning water inlet 9, and a slag outlet 10. The pipeline connected to the return port 8 and the pipeline connected to the slag outlet 10 share the same two branch pipes. A pneumatic ball valve 11 is provided on the pipeline.

[0018] The feed inlet 6 and the clean material outlet 7 connected to the 1# iron removal chamber 1 or the 2# iron removal chamber 2 constitute a slurry iron removal passage; the return material port 8 connected to the 1# iron removal chamber 1 or the 2# iron removal chamber 2 serves as a reflux passage for the residual slurry before the iron removal chamber is cleaned; the cleaning water inlet 9 and the slag outlet 10 connected to the 1# iron removal chamber 1 or the 2# iron removal chamber 2 constitute a cleaning passage.

[0019] A method for slurry iron removal is performed using the above-mentioned self-cleaning pipeline permanent magnetic slurry iron remover, in which the operating states of each of the 1# iron removal chamber 1 and the 2# iron removal chamber 2 include an iron removal state and a cleaning state; when in the iron removal state, the slurry enters the iron removal chamber through the feed port 6, is adsorbed by the magnetic rod 5, and is discharged from the clean material outlet 7; when in the cleaning state, the clean material outlet 7 and the feed port 6 are first closed and the return port 8 is opened, so that the slurry remaining in the iron removal chamber is discharged through the return port 8, and then the return port 8 is closed, and the cleaning water inlet 9 and the slag outlet 10 are opened, so that the cleaning water carrying iron debris is discharged through the slag outlet 10.

[0020] When the 1# iron removal chamber 1 is in the iron removal state, the 2# iron removal chamber 2 is in the cleaning state; when the 2# iron removal chamber 2 is in the iron removal state, the 1# iron removal chamber 1 is in the cleaning state.

[0021] The present invention can be used for discharging slurry in a fully enclosed pipeline and ensures that ferromagnetic substances are completely removed from the slurry. When the process requirements are high, the equipment can be connected in multiple stages in series to achieve a more ideal iron removal effect. The present invention adopts a double magnetic separation chamber and a design concept of a shared input and output flange interface.

[0022] 1. Application and features: 1. Application: It is suitable for removing iron from positive electrode materials of lithium battery, ternary, high nickel ternary, lithium iron phosphate and other positive electrode materials. It can also be used as special equipment for removing ferromagnetic impurities from some automatically flowing materials in building ceramic factories, craft ceramic factories, sanitary ware factories, glass factories, etc.

[0023] 2. Technical features: The self-cleaning pipeline permanent magnetic slurry iron remover of the present invention is a new type of iron remover that automatically absorbs ferromagnetic substances in the material from the slurry and automatically washes and discharges slag. It is fully automatically controlled and does not require special personnel to supervise. The magnetic rod of the self-cleaning permanent magnetic slurry iron remover uses high-performance permanent magnetic NdFeB material as a magnetic source, and has the characteristics of strong magnetic field, large suction force, and high iron removal rate. The iron removal time of this equipment is adjustable, and it has the characteristics of maintenance-free, energy-saving, easy installation, safe and reliable use, etc.

[0024] 2. Technical parameters: Table 1 Main technical parameters list 3. Working principle: The slurry to be separated enters the permanent magnetic iron removal chamber through the feed port, and passes through multiple groups of high-field strength permanent magnetic rods to adsorb the ferromagnetic impurities in the slurry. Then, the ferromagnetic impurities adsorbed on the magnetic rod sleeve are separated in the iron removal chamber by the pulling of the cylinder, and finally the iron impurities are discharged from the slag outlet through the flushing effect of the cleaning water.

[0025] The detailed iron removal process is as follows: this equipment is a double-drum design, works alternately, is PLC controlled, and has an adjustable iron unloading time interval. The material enters the 1# iron removal chamber (iron removal state) from the bottom feed port, and is discharged from the clean material outlet after being adsorbed by the permanent magnetic rod. The 2# iron removal chamber (cleaning state): the 2# iron removal chamber clean material outlet valve is closed, the 2# chamber return valve is opened, the bottom L-shaped three-way valve is closed, the feed is closed and the return material starts at the same time, and the slurry in the 2# iron removal chamber is returned to the raw material through the return pipe, and then the 2# return valve is closed, the 2# slag valve is opened, and the 2# slag valve is opened. #The flushing water valve is opened, and the high-pressure flushing water is repeatedly flushed three times. The ferromagnetic materials are discharged through the slag outlet along with the flushing water, and then the slag outlet valve is closed and enters the iron removal standby state. When the adsorption capacity of the magnetic rod in the 1# iron removal chamber reaches the saturation state, the L-type three-way valve of the 2# iron removal chamber is opened to feed, the 2# clean material outlet valve is opened, the 2# iron removal chamber enters the iron removal state, and the 1# iron removal chamber enters the cleaning state. This cycle is repeated to complete the iron removal. The above working process is automatically controlled by the PLC program to open and close the pneumatic valve to achieve automatic iron removal.

[0026] 4. Structural features: The machine is mainly composed of magnetic rod assembly, cylinder, pneumatic ball valve, pipeline, pipeline flange, frame and other parts.

[0027] The magnetic bar assembly is the key component of this iron remover. It consists of a high-field strength magnetic bar, a magnetic bar fixing plate, a magnetic bar retainer, a magnetic bar spacer, a magnetic bar sleeve and other parts.

[0028] ⑴ The magnetic material is made of high remanence and high coercivity magnetic material. The high field strength magnetic rod is based on the principle of magnetic aggregation. The magnetic induction intensity on the surface of the magnetic rod is more than 12000Gs. The magnetic rod tube is made of non-magnetic material 316L.

[0029] ⑵ The magnetic rod sleeve is made of non-magnetic material 316L.

[0030] ⑶ This component drives the magnetic rod to move in the magnetic rod sleeve through the cylinder, and the ferromagnetic impurities adsorbed on the magnetic rod sleeve are separated from the adsorption area to the non-magnetic area, thereby realizing the iron unloading function.

[0031] ⑷ The iron removal chamber is an important part for sorting fluid slurry. The iron removed from the magnetic bar is discharged from the slag outlet by the flushing effect of the flushing water. The iron removal chamber is equipped with a sight glass to observe the flow of slurry and iron removal in the iron removal chamber at any time.

[0032] ⑸The frame is a structural component welded from profiles and bears the entire weight of the host.

[0033] 5. Lubrication system: This equipment does not require a lubrication system.

[0034] 6. Equipment installation, commissioning and trial operation Before installation, check whether all parts have defects such as damage, deformation, rust, etc. If there are defects that hinder operation or affect appearance, they should be repaired in time.

[0035] Check the pressure and gas surplus of the gas source equipment to ensure that the gas source of the equipment is sufficient, check whether the gas pipeline has cracks, looseness, or falling off, and whether the pipeline is well sealed. Check whether the pneumatic ball valve is working properly.

[0036] Check whether the magnetic separation and iron unloading parts are working properly, and whether there is any leakage at the circulating water flange connection.

[0037] After the above preparations are completed, the empty vehicle test run is carried out. The running time shall not be less than 1 hour. The following work needs to be done: The equipment runs smoothly.

[0038] The circuit operates normally and there is no leakage in the gas circuit.

[0039] After the idling is normal, it can be operated at full load.

[0040] 7. Operating procedures for self-cleaning pipeline permanent magnetic slurry remover: In order to ensure the correct use of the iron remover and extend the service life of the equipment, the following procedures should be followed: ⑴. Check all work before operation; ⑵. Whether there is any water leakage in the water supply pipe, feed inlet and other pipe connection parts of the iron remover; ⑶. Check whether the cylinder, iron removal sleeve and other parts are running smoothly and whether there is any jamming phenomenon; ⑷. Check whether the electrical control box has any faults; ⑸. Check whether the connecting bolts are loose; ⑹. If the inspection is normal, the following procedures should be followed: a. Connect the slurry to the equipment feed port; connect the cleaning water to the equipment cleaning water inlet.

[0041] b. Turn on the power and make the equipment run; c. According to the flow rate and iron content of the slurry, set the iron removal time, material return time and flushing time of the equipment, and it can operate at full load; d. When shutting down, stop the slurry first, then switch the equipment to manual mode, open the return valve, and after the return is completed, open the flushing valve, and the equipment enters the flushing mode. After flushing is completed, switch the equipment to automatic mode.

[0042] 8. Equipment maintenance and care: 1. Safety operating procedures for self-cleaning pipeline permanent magnetic slurry iron remover 1. Preparation before operation ⑴ Before operation, a no-load test run must be carried out to confirm that the equipment is normal. ⑵ Before the equipment is operated, contact the upper and lower processes, open the slurry and water pipes of each part, and then start the machine. ⑶ Check the operation of the iron remover and whether the net material outlet, return material outlet, slag outlet and various pipelines are unblocked.

[0043] 2. Precautions during operation: ⑴ According to the changes in the properties of the slurry and the concentration index, reasonably adjust various parameters. ⑵ Check whether the pipelines of the iron remover are blocked. ⑶ Timely adjust the iron removal time, return time and flushing time to ensure that the slurry achieves the best iron removal effect and at the same time ensure that the miscellaneous iron is not retained in the iron removal chamber.

[0044] 3. Daily maintenance: ⑴ When the iron remover stops working, the iron in the iron removal chamber must be flushed clean with cleaning water. ⑵ Check the operation of the cylinder and each pneumatic ball valve regularly to avoid jamming. ⑶ Check the use of each line and gas circuit in time. If aging or leakage occurs, replace them in time. ⑷ It is strictly forbidden to flush the electrical control box with water, otherwise it may cause damage to the equipment control box.

[0045] 2. Maintenance procedures Safety regulations: 1. Strictly implement the start and stop sequence. The equipment must be started and stopped according to the dispatch instructions. Except in emergency situations, it is not allowed to be started or stopped without authorization.

[0046] 2. Before driving, check whether there is anyone around. Do not pile up debris next to the equipment and ensure that the area around the equipment is clean and tidy.

[0047] 3. People who are laid off should protect each other.

[0048] 4. Safety devices must be complete, otherwise the equipment is strictly prohibited from operating.

[0049] 5. When going up or down the ladder, hold the handrail tightly and stand firmly to avoid stepping on empty space.

[0050] 6. Do not touch live facilities with wet hands. Any electrical equipment failure must be repaired by an electrician and workers in any position are not allowed to handle it without authorization.

[0051] 7. Whenever working in a dangerous area, safety construction measures must be in place and the person arranging the work must brief the staff and eliminate unsafe factors, otherwise no work is allowed.

[0052] 8. Do not throw tools or debris around to avoid hurting others; do not play or fight to avoid accidents.

[0053] 9. When flushing the floor, it is strictly forbidden to splash water onto the electrical control box and related connecting equipment.

[0054] The maintenance method of this machine is as follows: (1) Check the working condition of the cylinder in time. If any abnormality occurs, replace it in time; (2) Check the working status of each pneumatic ball valve and related solenoid valve in time. If leakage, loose closure, abnormal solenoid valve attraction, etc. occur, the machine should be stopped for inspection and maintenance in time.

[0055] The embodiments of the present invention are described in detail above, but the contents are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the scope of the present invention shall be included in the protection scope of the present invention.

Claims

1. Self-cleaning pipeline permanent magnetic slurry iron remover, characterized by The invention comprises a 1# iron removal chamber (1), a 2# iron removal chamber (2), a feed inlet (6), a clean material outlet (7), a return material outlet (8), a cleaning water inlet (9), and a slag material outlet (10), wherein the 1# iron removal chamber (1) and the 2# iron removal chamber (2) each comprise a magnetic rod tube sleeve (3), a cylinder (4), and a magnetic rod (5), wherein the magnetic rod tube sleeve (3) is fixedly connected to the interior of the iron removal chamber, the cylinder (4) is arranged inside the iron removal chamber, the magnetic rod (5) is connected to the free end of the cylinder (4), and the movement stroke of the magnetic rod (5) is located at the magnetic rod tube sleeve ( 3) Inside; the feed inlet (6) is connected to the 1# iron removal chamber (1) and the 2# iron removal chamber (2) through pipelines, the clean material outlet (7) is connected to the 1# iron removal chamber (1) and the 2# iron removal chamber (2) through pipelines, the return material outlet (8) is connected to the 1# iron removal chamber (1) and the 2# iron removal chamber (2) through pipelines, the cleaning water inlet (9) is connected to the 1# iron removal chamber (1) and the 2# iron removal chamber (2) through pipelines, and the slag outlet (10) is connected to the 1# iron removal chamber (1) and the 2# iron removal chamber (2) through pipelines.

2. The self-cleaning pipeline permanent magnetic slurry iron remover according to claim 1 is characterized in that: The pipeline comprises a main pipe connected to the port and branch pipes connected to the No. 1 iron removal chamber (1) and the No. 2 iron removal chamber (2); the main pipe and the two branch pipes are connected via a tee, and a three-way valve is provided at the tee; the port comprises a feed port (6), a clean material outlet (7), a return material port (8), a cleaning water inlet (9), and a slag outlet (10).

3. The self-cleaning pipeline permanent magnetic slurry iron remover according to claim 2 is characterized in that: The pipeline connected to the return port (8) and the pipeline connected to the slag outlet (10) share the same two branch pipes.

4. The self-cleaning pipeline permanent magnetic slurry iron remover according to claim 1 is characterized in that: A pneumatic ball valve (11) is provided on the pipeline.

5. The self-cleaning pipeline permanent magnetic slurry iron remover according to claim 1 is characterized in that: The feed inlet (6) and the clean material outlet (7) connected to the No. 1 iron removal chamber (1) or the No. 2 iron removal chamber (2) constitute a slurry iron removal passage; the return material port (8) connected to the No. 1 iron removal chamber (1) or the No. 2 iron removal chamber (2) serves as a reflux passage for residual slurry before cleaning the iron removal chamber; and the cleaning water inlet (9) and the slag outlet (10) connected to the No. 1 iron removal chamber (1) or the No. 2 iron removal chamber (2) constitute a cleaning passage.

6. A method for removing iron from slurry using the self-cleaning pipeline permanent magnetic slurry remover according to claim 1, characterized in that: In the method, the operating states of the 1# iron removal chamber (1) and the 2# iron removal chamber (2) each include an iron removal state and a cleaning state; when in the iron removal state, slurry enters the iron removal chamber through a feed port (6), is adsorbed by a magnetic bar (5), and is discharged from a clean material outlet (7); when in the cleaning state, the clean material outlet (7) and the feed port (6) are first closed and the return port (8) is opened, so that the slurry remaining in the iron removal chamber is discharged through the return port (8), and then the return port (8) is closed, and the cleaning water inlet (9) and the slag outlet (10) are opened, so that the cleaning water carrying iron impurities is discharged through the slag outlet (10).

7. The method according to claim 6, characterized in that When the 1# iron removal chamber (1) is in the iron removal state, the 2# iron removal chamber (2) is in the cleaning state; when the 2# iron removal chamber (2) is in the iron removal state, the 1# iron removal chamber (1) is in the cleaning state.

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