Method for removing magnetic impurities from slurry

Abstract

The invention discloses a method for removing magnetic impurities in slurry, which comprises the following steps of: constructing a flowing path for enabling the slurry to sequentially flow through each unit based on a plurality of modularized slurry treatment units; the slurry is driven to flow along the flowing path, so that magnetic impurities in the slurry are adsorbed by the magnetic bars arranged in the units; preset parameters associated with the adsorption state of each magnetic rod are monitored; when the preset parameters reach a preset cleaning threshold value for any magnetic bar, slurry pumping is stopped, and automatic cleaning operation is executed on the magnetic bars; and after cleaning is completed, slurry pumping is recovered, and the system continues to operate. According to the method for removing the magnetic impurities in the slurry, efficient and continuous impurity removal and purification of the slurry are achieved through the slurry treatment units arranged in a modularized mode.

Description

Technical Field

[0001] This invention relates to the field of material purification technology, specifically to a method for removing magnetic impurities from slurry. Background Technology

[0002] In numerous industrial sectors, including chemical, food, pharmaceutical, ceramic, and new energy materials, slurries (or fluid products) are widely used as a common material form. During production, transportation, or raw material sourcing, these slurries are highly susceptible to the introduction or generation of magnetic impurities (such as iron filings, iron oxide particles, and metal dust introduced by wear). The presence of these magnetic impurities can adversely affect equipment operation and product quality.

[0003] Currently, magnetic rod separators are widely used in the industry for iron removal from slurries. Traditional magnetic rod separators typically install one or more magnetic rods in a flow channel or tank. As the slurry flows around the magnetic rods, ferromagnetic impurities are adsorbed onto the surface of the rods. However, this traditional structure has several significant drawbacks: firstly, its monolithic structure makes it difficult to flexibly adjust the magnetic field density and range of action according to changes in throughput, flow rate, or impurity load; secondly, iron removal operations largely rely on manual cleaning by periodically removing the magnetic rods, which is labor-intensive and the cleaning cycle is difficult to control precisely. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method for removing magnetic impurities from slurry, which achieves efficient and continuous purification of slurry through modularly arranged slurry processing units.

[0005] To achieve the above objectives, the present invention provides a method for removing magnetic impurities from slurry, comprising:

[0006] Based on multiple modular slurry processing units, a flow path is constructed that allows the slurry to flow through each unit sequentially.

[0007] The slurry is driven to flow along the flow path, so that magnetic impurities in the slurry are adsorbed by the magnetic rods set in each unit.

[0008] Monitor preset parameters associated with the adsorption state of each magnetic rod;

[0009] When the preset parameters reach the preset cleaning threshold for any magnetic rod, the slurry pumping is stopped, and an automatic cleaning operation is performed on the magnetic rod.

[0010] After cleaning is completed, slurry pumping is resumed to allow the system to continue operating.

[0011] Optionally, when constructing the flow path, the number of slurry processing units to be activated is determined based on at least one of the estimated content of magnetic impurities in the slurry, its physical properties, or the target purification precision.

[0012] Optionally, the constructed flow path is configured such that the slurry flows in opposite directions through two adjacent slurry processing units.

[0013] Optionally, to achieve the opposite overall flow direction, the number of activated slurry processing units is an even number.

[0014] Optionally, the flow rate of the slurry in the flow path can be controlled by adjusting the output of a pump located at the beginning of the flow path.

[0015] Optionally, the preset parameter is a cumulative time value, and the cleanup threshold corresponds to a preset continuous running duration.

[0016] Optionally, the automatic cleaning operation includes:

[0017] Remove the magnetic rod from its working position within the corresponding slurry processing unit;

[0018] A scraping operation is performed on the exposed surface of the magnetic rod to remove the magnetic impurities it has adsorbed and collect them;

[0019] The cleaned magnetic rod is returned to its working position, and the slurry processing unit is restored to its sealed state.

[0020] Optionally, the scraping operation on the exposed magnetic rod surface includes:

[0021] Move a receiving tray to the receiving position below the magnetic rod;

[0022] A scraping ring located outside the magnetic rod is driven to move along the axial direction of the magnetic rod to scrape off magnetic impurities on its surface and allow the scraped impurities to fall into the receiving tray.

[0023] Move the receiving tray away from the receiving position and reset the scraper ring.

[0024] Optionally, the slurry processing unit is a vertically arranged sealed tank, and the magnetic rod moves up and down in the vertical direction to remove and reset it.

[0025] Optionally, after the receiving tray is removed, the impurities collected therein are transported to a centralized waste container via a discharge pipe connected to its bottom.

[0026] Compared with the prior art, the advantages of this invention are as follows:

[0027] 1. Modular design allows for flexible addition, reduction, and combination of slurry processing units based on specific operating conditions such as raw material impurity content and product purification requirements. The same method or system can easily adapt to production needs with different capacities and purification standards, resulting in a wide range of applications and high equipment utilization. Furthermore, modular design facilitates installation, maintenance, and commissioning; each slurry processing unit can be cleaned, maintained, or even replaced independently without affecting other units.

[0028] 2. The magnetic rod adsorption status is monitored by preset parameters (such as time), and scraping and cleaning are automatically triggered when the threshold is reached. No manual intervention is required. Operation resumes immediately after cleaning, which greatly ensures the continuity of production, reduces the intensity and uncertainty of manual operation, and achieves precise control of the process. Attached Figure Description

[0029] Figure 1 This is a schematic flowchart of a method for removing magnetic impurities from slurry according to an embodiment of this application. Detailed Implementation

[0030] To make the objectives and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Currently, magnetic rod separators are widely used in the industry for iron removal from slurries. Traditional magnetic rod separators typically install one or more magnetic rods in a flow channel or tank. As the slurry flows around the magnetic rods, ferromagnetic impurities are adsorbed onto the surface of the rods. However, this traditional structure has several significant drawbacks: firstly, its monolithic structure makes it difficult to flexibly adjust the magnetic field density and range of action according to changes in throughput, flow rate, or impurity load; secondly, iron removal operations largely rely on manual cleaning by periodically removing the magnetic rods, which is labor-intensive and the cleaning cycle is difficult to control precisely.

[0032] To overcome these shortcomings, some improvements have been attempted in the industry, such as using liftable magnetic rods in conjunction with simple scraping mechanisms. However, there is still room for improvement in the modularity of the overall structure, the precision of automated control, and the reliability of continuous operation for such systems.

[0033] Based on this, the present invention aims to provide a more efficient, reliable and highly automated method and system for removing magnetic impurities from slurries, in order to solve the problems of insufficient flexibility, reliance on manual operation, poor continuous operation capability and inconvenient maintenance in the prior art.

[0034] In one embodiment of the present invention, such as Figure 1 As shown, a method for removing magnetic impurities from slurry is provided, comprising:

[0035] S1: Based on multiple modular slurry processing units, a flow path is constructed that allows the slurry to flow through each unit sequentially.

[0036] Specifically, four standardized slurry processing units (M1, M2, M3, M4) with identical structures are selected. The main body of each slurry processing unit is a cylindrical sealed tank made of SUS304 stainless steel, with an automatically opening and closing sealing cover on the top. A high-strength neodymium iron boron permanent magnet is vertically installed in the center of each tank. The top of the magnet is connected to the sealing cover and is driven by a cylinder to achieve vertical lifting between the working position inside the tank and the cleaning position outside the tank.

[0037] Each magnetic rod is equipped with a PTFE scraper ring that can move along the axis of the magnetic rod, and a cylinder or linear motor that drives the scraper ring to move up and down. At the same time, a horizontally movable receiving tray is provided on the side of the processing unit. Optionally, the bottom of the receiving tray is conical and connected to a flexible hose leading to a centralized waste bin.

[0038] The four slurry processing units (M1, M2, M3, M4) are connected in series via quick-connect flanges and pipes.

[0039] The specific connection method is as follows: the feed pipe is connected to the bottom inlet of M1, the top outlet of M1 is connected to the top inlet of M2 through a pipe; the bottom outlet of M2 is connected to the bottom inlet of M3 through a pipe; the top outlet of M3 is connected to the top inlet of M4 through a pipe; and the bottom outlet of M4 is connected to the discharge pipe.

[0040] The flow path formed by this connection method is S-shaped. The slurry flows from bottom to top in M1, from top to bottom in M2, from bottom to top in M3, and from top to bottom in M4. The flow path adopts the design of opposite flow directions between adjacent units, which can effectively disturb the slurry, increase the contact opportunity and adsorption probability between magnetic impurities and the magnetic rod, and significantly improve the impurity removal rate of a single process.

[0041] S2: Drives the slurry to flow along the flow path, so that magnetic impurities in the slurry are adsorbed by the magnetic rods set in each unit.

[0042] Specifically, the feed pipe is connected to a feed pump, which drives the slurry to flow along the flow path. The feed pump can be a diaphragm pump, and the flow rate of the slurry in the flow path can be controlled by adjusting its output power.

[0043] S3: Preset parameters associated with the adsorption state of each magnetic rod;

[0044] Specifically, the central control unit acquires parameters related to the adsorption state of each magnetic rod in real time or periodically. The central control unit can be an industrial PLC, which monitors the system's operating status through matching flow meters, pressure sensors, and position sensors of each module cylinder.

[0045] Meanwhile, the PLC has a preset cleaning cycle for each magnetic rod (e.g., a cumulative running time of 8 hours) and is programmed to control the start and stop of the feed pump, the lifting and lowering of the magnetic rods in each unit, the opening and closing of the sealing cover, the movement of the scraper ring, and the movement of the receiving tray.

[0046] S4: When the preset parameters reach the preset cleaning threshold for any magnetic rod, stop the slurry pumping and perform an automatic cleaning operation on the magnetic rod.

[0047] Specifically, when the cumulative running time reaches the preset cleaning threshold (e.g., 8 hours for cleaning), the PLC determines that the system needs to perform cleaning. The PLC first sends a command to stop the feed pump, thus stopping the slurry pumping; then, it opens the sealing cover and vertically lifts the magnetic rod from its working position inside the tank to the cleaning position outside the tank, fully exposing its surface covered with impurities; it controls the M receiving tray to move horizontally to directly below the magnetic rod; it drives the scraper ring to descend uniformly from the top of the magnetic rod to the bottom, thoroughly scraping away all magnetic impurities adsorbed on the surface of the magnetic rod, and the scraped impurities fall into the receiving tray below; the scraper ring returns to the top, and the receiving tray moves horizontally back to its initial position, with the impurities accumulated at the bottom of the receiving tray falling into the centralized waste bin by gravity through the hose during the movement; finally, the magnetic rod is reinserted into the tank to the working position, and then the sealing cover is closed to ensure that each unit is restored to a sealed state.

[0048] S5: After cleaning is completed, resume slurry pumping to allow the system to continue operating.

[0049] Specifically, after the magnetic rod is cleaned and reset, the PLC restarts the feed pump, new slurry is pumped into the system, and the system enters the next operating cycle.

[0050] As can be seen, the magnetic impurity removal method for slurry in this embodiment is based on a modularly designed slurry processing system. The number of slurry processing units can be flexibly increased, decreased, and combined according to specific working conditions such as the impurity content of raw materials and product purification requirements. The same method or system can easily adapt to production needs with different capacities and purification standards, has a wide range of applications, and high equipment utilization. At the same time, the modular design facilitates installation, maintenance, and debugging. Each slurry processing unit can be cleaned, maintained, or even replaced independently without affecting other units.

[0051] Meanwhile, the magnetic rod adsorption status is monitored by preset parameters (such as time), and scraping and cleaning are automatically triggered when the threshold is reached. No manual intervention is required, and operation resumes immediately after cleaning. This greatly ensures the continuity of production, reduces the intensity and uncertainty of manual operation, and achieves precise control of the process.

[0052] In some feasible implementations, the number of slurry processing units to be activated is determined based on at least one of the estimated content of magnetic impurities in the slurry, its physical properties, or the target purification precision.

[0053] Specifically, when processing slurries with low impurity content, to save energy and space, only two slurry processing units (such as M1 and M2) can be used to construct the flow path. When processing slurries with extremely high impurity content, or high-end products requiring ultra-low iron content (such as less than 5 ppm), the number of processing units can be increased, for example, by connecting 6 or 8 slurry processing units in series to form a longer adsorption path and more countercurrent flow sections, in order to achieve higher purification accuracy.

[0054] In some feasible implementations, in addition to timed cleaning, the PLC program can also be modified to trigger cleaning based on the feedback signal from the online iron content detector installed in the pipeline. When the iron content of the slurry at the outlet of a certain unit approaches the set upper limit, it is determined that the magnetic rod of that unit is saturated, and an automatic cleaning operation is started for that magnetic rod, instead of cleaning the entire system synchronously, thereby further optimizing the operating efficiency.

[0055] In some feasible implementations, the PLC program can also be modified to trigger cleaning based on the monitoring signal of the magnetic flux sensor. When the upper limit of the adsorption thickness on the surface of the magnetic rod is detected, it is determined that the magnetic rod is saturated and an automatic cleaning operation for the magnetic rod is started.

[0056] In some feasible implementations, the magnetic rod can also be an electromagnetic rod, which can achieve adsorption and release by switching on and off the power. In this case, the cleaning of the magnetic rod no longer requires removing it from the tank and cleaning it by scraping. Instead, after the power is turned off, the magnetic rod is rinsed by stirring the water flow, and finally the slurry containing a large number of impurities is discharged to achieve the cleaning of the magnetic rod.

[0057] In summary, this invention realizes the transformation of the slurry iron removal process from a fixed, intermittent, and manual-dependent type to a flexible, continuous, and intelligent automated type. While improving product quality and production efficiency, it effectively reduces operation and maintenance costs and has outstanding industrial application value.

[0058] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made based on the essence of the content of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for removing magnetic impurities from slurry, characterized in that, include: Based on multiple modular slurry processing units, a flow path is constructed that allows the slurry to flow through each unit sequentially. The slurry is driven to flow along the flow path, so that magnetic impurities in the slurry are adsorbed by the magnetic rods set in each unit. Monitor preset parameters associated with the adsorption state of each magnetic rod; When the preset parameters reach the preset cleaning threshold for any magnetic rod, the slurry pumping is stopped, and an automatic cleaning operation is performed on the magnetic rod. After cleaning is completed, slurry pumping is resumed to allow the system to continue operating.

2. The method for removing magnetic impurities from slurry according to claim 1, characterized in that, When constructing the flow path, the number of slurry processing units to be activated is determined based on at least one of the estimated content of magnetic impurities in the slurry, its physical properties, or the target purification precision.

3. The method for removing magnetic impurities from slurry according to claim 1, characterized in that, The constructed flow path is configured such that the slurry flows through two adjacent slurry processing units in opposite directions.

4. The method for removing magnetic impurities from slurry according to claim 3, characterized in that, To achieve the opposite overall flow direction, the number of slurry processing units activated is an even number.

5. The method for removing magnetic impurities from slurry according to claim 1, characterized in that, The flow rate of the slurry in the flow path is controlled by adjusting the output of the pump located at the beginning of the flow path.

6. The method for removing magnetic impurities from slurry according to claim 1, characterized in that, The preset parameter is a cumulative time value, and the cleanup threshold corresponds to a preset continuous running duration.

7. The method for removing magnetic impurities from slurry according to claim 1, characterized in that, The automatic cleaning operation includes: Remove the magnetic rod from its working position within the corresponding slurry processing unit; A scraping operation is performed on the exposed surface of the magnetic rod to remove the magnetic impurities it has adsorbed and collect them; The cleaned magnetic rod is returned to its working position, and the slurry processing unit is restored to its sealed state.

8. The method for removing magnetic impurities from slurry according to claim 7, characterized in that, The scraping operation on the exposed magnetic rod surface includes: Move a receiving tray to the receiving position below the magnetic rod; A scraping ring located outside the magnetic rod is driven to move along the axial direction of the magnetic rod to scrape off magnetic impurities on its surface and allow the scraped impurities to fall into the receiving tray. Move the receiving tray away from the receiving position and reset the scraper ring.

9. The method for removing magnetic impurities from slurry according to claim 1 or 7, characterized in that, The slurry processing unit is a vertically arranged sealed tank, and the magnetic rod moves up and down in the vertical direction to remove and reset it.

10. The method for removing magnetic impurities from slurry according to claim 8, characterized in that, After the receiving tray is removed, the impurities collected therein are transported to a centralized waste container via a discharge pipe connected to its bottom.

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