CN107812609A - Magnetic deslimer - Google Patents

Abstract

The invention provides a magnetic deslimer, which belongs to the technical field of mineral processing machinery, and includes a cylinder body, a feeder, an overflow tank and a uniform flow water supply device. The feeder and the overflow tank are both arranged on the top of the cylinder body, and the The water supply device is installed at the bottom of the cylinder; the main excitation coil is provided outside the cylinder, and the discharge hopper with the slurry valve is installed at the bottom of the cylinder; In the middle of the body cavity, the outlet at the lower end of the drop tube is provided with a uniform discharge structure. The magnetic deslimer provided by the present invention uses a uniform discharge structure to evenly disperse the falling slurry, and enters water into the cylinder through a uniform flow water supply device, so that the slurry and the incoming water can be fully mixed, and the impact of the upstream water flow Next, the magnetic iron ore particles in the slurry will fall to the discharge hopper under the action of the magnetic force of the main excitation coil and its own weight, and the impurities and mud will be discharged from the overflow tank with the water flow, so as to achieve the purpose of improving the concentrate grade.

Description

Magnetic deslimer

technical field

The invention belongs to the technical field of mineral processing machinery, and more specifically relates to a magnetic deslimer.

Background technique

After the iron ore is mined, it needs to be sorted first to remove useless impurities, improve the grade of the ore, and then send it to smelting in order to improve smelting efficiency, reduce smelting costs, and improve product quality. The current iron ore sorting process is generally The ore is firstly ground to a certain fineness by grinding equipment, and then sorted by sorting equipment (gravity separator, magnetic separator, flotation machine, etc.) to obtain the required high-grade iron ore concentrate products . Because the grade of iron ore in my country is generally low, and the content of useless components (mud) such as silicon gangue is high, to obtain high-grade iron ore concentrate, it is necessary to repeatedly grind and select several times. The cleaning process of desliming with a conventional elutriation magnetic separator is as follows: the pulp enters the cylinder through the upper feeding port, the iron ore powder falls freely under the action of gravity, the clean water washes the iron ore powder from bottom to top, and the iron ore powder Together with the gravity, it falls to the bottom of the cylinder, and the mud is discharged from the upper part with the water flow. However, since the pulp and clean water enter the cylinder from the top and bottom of the cylinder respectively, and the distribution is uneven when entering the cylinder, the water flow cannot fully disperse the pulp, resulting in the bottom of the ore still containing some impurities and mud, and the Poor mud effect will affect iron ore grade; and equipment investment is high, output and efficiency are low.

Contents of the invention

The purpose of the present invention is to provide a magnetic deslimer to solve the technical problems existing in the prior art that the slurry is not uniformly dispersed, the desliming effect is poor, the iron ore grade is affected, the equipment investment is high, and the output and efficiency are low.

In order to achieve the above object, the technical solution adopted by the present invention is to provide a magnetic deslimer, including a cylinder, a feeder, an overflow tank and a uniform water supply device, and the feeder for injecting slurry into the cylinder and the overflow tank for discharging mud are all arranged on the top of the cylinder, and the uniform flow water supply device for entering water into the cylinder is arranged at the bottom of the cylinder; the outside of the cylinder is provided with a main excitation coil, and the bottom of the cylinder There is a discharge hopper with a pulp valve; the feeder includes a feed hopper and a drop pipe, the feed hopper is arranged at the upper end of the drop pipe, and the outlet of the drop pipe is arranged in the middle of the inner cavity of the cylinder , the drop pipe is provided with a uniform discharge structure.

Further, the uniform discharge structure is a conical homogenizer, the tip of the conical homogenizer faces upwards, and the outer conical surface is connected to the inner wall of the discharge pipe through a plurality of connecting plates, and the connecting plates are uniformly distributed along the conical shape. The outer wall of the feeder is radially distributed, one side of the connecting plate is connected with the inner wall of the feeding tube, the other side of the connecting plate is connected with the outer wall of the conical homogenizer, and the lower end edge of the feeding tube is arranged on Above the lower edge of the conical homogenizer.

Further, the uniform discharge structure is an annular homogenizer, and the annular homogenizer includes a plurality of diffused distribution pipes inclined downward, and the upper ends of the distribution pipes are radially distributed on the The lower end of the drop pipe, the lower end of the distribution pipe is connected to the annular distribution pipe, the annular distribution pipe is horizontally arranged in the middle of the cylinder body, and several evenly distributed outlets are arranged on the lower surface of the annular distribution pipe. feed port.

Further, the middle part of the material distribution pipe and the annular distribution pipe is provided with a closed auxiliary inner pipe, and an auxiliary excitation coil is arranged in the auxiliary inner pipe, and the upper end of the auxiliary inner pipe is connected with the lower end of the discharge pipe, so that The above-mentioned material distribution pipe surrounds the auxiliary inner pipe.

Further, the inside of the discharge pipe is provided with an inner cylinder whose lower end extends to the middle of the cylinder, and the uniform discharge structure is a plurality of feeding tubes arranged between the outer wall of the inner cylinder and the inner wall of the discharge pipe. There is an overflow channel between two adjacent feeding channels. Both the feeding channel and the overflow channel are connected to the inner cavity of the cylinder, and the upper end of the feeding channel is connected to the feed bucket, and the outer end of the overflow channel communicates with the overflow tank.

Further, a feed pipe for slurry injection is arranged tangentially on the outer circle of the feed hopper, and a spiral deflector for guiding the slurry is arranged inside the feed hopper, and the deflector is arranged at the inlet above the feed tube.

Further, the discharge hopper is in the shape of an inverted cone, an inverted cone-shaped wear-resistant cone is provided between the bottom of the discharge hopper and the pulp valve, and a flushing port for backwashing the discharge hopper is provided on the side of the wear-resistant cone .

Further, a top cover for sealing is provided above the hopper, an observation hole for observation is provided in the middle of the top cover, and an openable cover plate is provided on the observation hole.

Further, the overflow tank is provided with an overflow tank cover, the overflow tank cover is provided with an observation hole for observation, and a mud concentration variable for detecting the concentration of overflowing mud is provided on the side wall of the overflow tank. The other side of the overflow tank is provided with an overflow port; the side wall of the discharge hopper is provided with a pulp concentration transmitter for detecting the concentration of the pulp.

Further, the uniform flow water supply device includes a water distribution pipe, a buffer chamber, a connecting pipe and a water supply pipe, the water supply pipe is arranged outside the cylinder, and the buffer chamber is arranged in the cylinder and communicated with the water supply pipe through the connection pipe; There are more than two water distribution pipes arranged radially around the buffer chamber. The water distribution pipes are horizontally arranged and communicated with the buffer chamber. the water outlet.

Further, the water diversion port is several horizontally parallel circular holes, several horizontally parallel narrow slits or strip-like long narrow slits.

The beneficial effect of the magnetic deslimer provided by the present invention is that: compared with the prior art, the magnetic deslimer of the present invention can evenly disperse the falling slurry by setting a uniform discharge structure at the outlet of the lower end of the feeder. Open, the water is fed into the cylinder through the uniform flow water supply device, so that the slurry and the water can be fully mixed. Falling to the discharge hopper, the impurities and mud are discharged from the overflow tank with the water flow, so as to achieve the purpose of improving the concentrate grade; the invention has a simple and compact structure, can improve the beneficiation efficiency and output, and reduce equipment costs.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only of the present invention. For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

Fig. 1 is the structural representation of the magnetic force deslimer that embodiment 1 of the present invention provides;

Fig. 2 is the schematic structural view of the feeder in the magnetic desilter provided by Embodiment 1 of the present invention;

Fig. 3 is A-A sectional view among Fig. 2;

Fig. 4 is B-B sectional view among Fig. 2;

Fig. 5 is a schematic structural view of the magnetic deslimer provided in Embodiment 2 of the present invention;

Fig. 6 is a schematic structural view of the feeder in the magnetic desilter provided by Embodiment 2 of the present invention;

Figure 7 is a schematic structural view of the magnetic deslimer provided in Embodiment 3 of the present invention;

Fig. 8 is a D-D sectional view among Fig. 7;

Figure 9 is a schematic structural view of the uniform flow water supply device in the magnetic desilter provided by Embodiments 1, 2, and 3 of the present invention;

Fig. 10 is the C-C sectional view among Fig. 9;

Wherein, each reference sign in the figure:

1-feed hopper, 2-overflow tank, 3-mud concentration transmitter, 4-outlet hopper, 5-overflow port, 6-feeding pipe, 7-cylinder, 8-main excitation coil, 9- Uniform flow water supply device, 10-feeding pipe, 11-slurry concentration transmitter, 12-wear-resistant cone, 13-flushing water port, 14-slurry valve, 15-cover plate, 16-deflector, 17-connection Plate, 18-conical homogenizer, 19-water distribution pipe, 20-buffer chamber, 21-water distribution port, 22-connecting pipe, 23-water supply pipe, 24-conical pipe, 25-circular homogenizer, 26 - distribution pipe, 27 - annular distribution pipe, 28 - discharge port, 29 - auxiliary inner pipe, 30 - auxiliary excitation coil, 31 - inner cylinder, 32 - feeding channel, 33 - overflow channel.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device Or elements must have a certain orientation, be constructed and operate in a certain orientation, and thus should not be construed as limiting the invention.

In addition, in the description of the present invention, "several" means two or more, unless otherwise specifically defined.

Please refer to Fig. 1, Fig. 5 and Fig. 7 together, and now the magnetic desilter provided by the present invention will be described. The magnetic deslimer includes a cylinder body 7, a feeder, an overflow tank 2 and a uniform flow water supply device, the feeder for injecting slurry into the cylinder body 7 and the overflow tank 2 for discharging mud are both It is arranged on the top of the cylinder 7, and the uniform flow water supply device for feeding water into the cylinder 7 is arranged on the bottom of the cylinder 7; the outside of the cylinder 7 is provided with a main excitation coil 8, and the bottom of the cylinder 7 is provided with a belt There is a discharge hopper 4 of a pulp valve 14; the feeder includes a feed hopper 1 and a drop pipe 6, and the feed hopper 1 is arranged on the upper end of the drop pipe 6, and the outlet of the drop pipe 6 is arranged on In the middle of the inner cavity of the cylinder body 7, the discharge pipe 6 is provided with a uniform discharge structure. Utilize the uniform discharge structure to evenly disperse the falling slurry, and feed water into the cylinder body 7 through the uniform flow water supply device 9, so that the slurry and the incoming water can be fully mixed.

Compared with the prior art, the magnetic deslimer provided by the present invention can evenly disperse the falling slurry by setting a uniform discharge structure at the outlet of the lower end of the drop tube of the feeder, and send it to the cylinder body through a uniform flow water supply device. Water inlet provides uniform upward water flow, which can fully mix the slurry with the inlet water. Under the action of the upstream water flow, the magnetic iron ore particles in the slurry will fall to the discharge hopper under the magnetic force of the main excitation coil and its own weight. Discharge, impurities and mud are discharged from the overflow tank with the water flow. The invention has a simple and compact structure, can fully mix the slurry with the incoming water, fully precipitate the iron ore in the slurry, improve the separation efficiency, and further realize the purpose of improving the grade of the iron ore.

Embodiment 1: Please refer to Fig. 1, Fig. 2, Fig. 4 together, as a kind of embodiment of the magnetic force desilter provided by the present invention, the described uniform discharging structure is conical homogenizer 18, and described conical The tip of the conical homogenizer 18 faces upwards, and the outer conical surface is connected with the inner wall of the drop pipe 6 through a plurality of connecting plates 17. The connecting plates 17 are radially distributed along the outer wall of the conical homogenizing device 18. One of the connecting plates 17 The side is connected with the inner wall of the feeding pipe 6, the other side of the connecting plate 17 is connected with the outer wall of the conical homogenizer 18, and the lower edge of the lower end of the feeding pipe 6 is arranged above the lower edge of the conical homogenizer 18 . The slurry falling in the drop tube enters the cylinder evenly along the outer circumferential slope of the homogenizer to achieve the purpose of breaking up the slurry. In addition, the feed hopper 1 is arranged above the overflow tank 2, and the discharge pipe 6 is arranged vertically through the overflow tank 2 and the cylinder body 7, so as to shorten the falling distance of the slurry and make the overall structure more compact.

Embodiment 2: Please refer to Fig. 5 and Fig. 6 together. As a specific implementation of the magnetic deslimer provided by the present invention, the uniform discharge structure is a ring-shaped homogenizer 25, and the ring-shaped The homogenizer 25 includes a plurality of inclined downward diffuser distribution pipes 26, the upper end of the distribution pipe 26 is radially distributed on the lower end of the discharge pipe 6, and the lower end of the distribution pipe 26 communicates with the annular cloth. Pipe 27, the annular distribution pipe 26 is horizontally arranged in the middle of the cylinder body 7, and several evenly distributed discharge ports 28 are provided on the lower surface of the annular distribution pipe 27. The slurry falling in the drop tube flows down along the diffusion distribution tube, and disperses and evenly enters the cylinder from the discharge port of the lower ring-shaped distribution tube to achieve the purpose of breaking up the slurry. Wherein, the outlets can be strip-shaped or circular, and evenly distributed on the lower surface of the annular distribution pipe.

Further, please refer to Fig. 5 and Fig. 6 together. As a specific embodiment of the magnetic deslimer provided by the present invention, the middle part of the distribution pipe 26 and the annular distribution pipe 27 is provided with a closed auxiliary inner pipe 29, The auxiliary inner tube 29 is provided with an auxiliary excitation coil 30 , the upper end of the auxiliary inner tube 29 is connected to the lower end of the feeding tube 3 , and the distribution tube 26 surrounds the auxiliary inner tube 29 . In order to make full use of the space inside the cylinder, a closed auxiliary inner tube can be installed under the diffuser distribution tube, and the auxiliary excitation coil outside the auxiliary inner tube can enhance the magnetic field strength in the cylinder and further increase the magnetic iron ore in the slurry. The downward magnetic force of the particles makes it easier to fall to the discharge hopper for discharge, further improving the beneficiation efficiency.

Embodiment 3: Please refer to Fig. 7 and Fig. 8, as a specific embodiment of the magnetic deslimer provided by the present invention, the inside of the falling tube 6 is provided with an inner cylinder 31 whose lower end extends to the middle of the cylinder 7 , the uniform discharge structure is a plurality of feed passages 32 arranged between the outer wall of the inner cylinder 31 and the inner wall of the drop pipe 6, and the overflow flow is between two adjacent feed passages 32 Road 33, the feed channel 32 and the overflow channel 33 are both connected with the inner cavity of the cylinder body 7, the upper end of the feed channel 32 communicates with the feed hopper 1, and the outer end of the overflow channel 33 It communicates with the overflow tank 2. The slurry enters the feeding hopper, enters the cylinder from the surrounding feeding channel along the outer wall of the inner cylinder, and disperses the slurry evenly to the area close to the cylinder wall with a strong separation effect, which can enhance the separation effect, Improve the concentrate grade; the mud in the cylinder overflows upwards from the adjacent overflow channel, and the overflowed mud enters the overflow tank and is discharged. Utilizing the slurry with this structure can make full use of the area with stronger magnetic field and better sorting effect in the cylinder, improve the sorting efficiency, and at the same time, the overall structure is more compact.

Further, please refer to Fig. 2, Fig. 3 and Fig. 5, as a specific embodiment of the magnetic deslimer provided by the present invention, the outer circle of the feeding hopper 1 is tangentially provided with a feeding pipe for slurry injection 10. The feeding hopper 1 is provided with a spiral deflector 16 for guiding the slurry. The deflector 16 is arranged above the feeding pipe 10. The direction of rotation of the deflector 16 is related to the flow direction of the slurry. unanimous. The deflector should be divided into at least two sections on the circumference, the height of the head and tail of each section is the same, and there is a certain gap between the two sections, so that the slurry can flow downward along the spiral of the deflector. Feed tube. Among them, the diameter of the feeding hopper is larger than that of the feeding pipe, and the slurry enters the feeding hopper tangentially from the feeding pipe arranged tangentially along the inner wall of the feeding hopper. The slurry flowing on the inner wall of the hopper spirals downwards into the discharge pipe to prevent the slurry from rolling upwards; at the same time, the feed hopper and the discharge pipe are transitionally connected through a cone section, which is conducive to the feeding of the slurry, and the spiral downward slurry From the large-diameter feed hopper into the drop tube, the flow rate can be accelerated under the action of gravity.

Please refer to Figures 1 and 5. In a specific embodiment of the present invention, the overflow tank 2 and the cylinder 7 are transitionally connected through a tapered pipe 24, and the ratio of the diameter of the overflow tank 2 to the diameter of the cylinder 7 is 1.5- 2.0, the upper opening of the overflow tank is much larger than the lower outlet of the overflow tank, so that the slurry entering the overflow tank has more sufficient settling time, and the useful mineral particles entering the tailings can be removed to the greatest extent.

Further, please refer to Fig. 1, Fig. 5 and Fig. 7, as a specific embodiment of the magnetic deslimer provided by the present invention, the discharge hopper 4 is in the shape of an inverted cone, and the bottom of the discharge hopper 4 is connected to the slurry valve 14 An inverted cone-shaped wear-resistant cone 12 is provided between them, and a flushing port 13 for backwashing the discharge hopper 4 is provided on the side of the wear-resistant cone 12 . Since the pulp is frequently discharged from the discharge hopper, in order to avoid severe wear between the pulp and the discharge hopper, a wear-resistant cone made of wear-resistant material is installed at the lower end of the discharge hopper to prolong the service life of the discharge hopper; at the same time, both ends of the wear-resistant cone are connected to the discharge hopper, The slurry valves are connected by flanges, which is more convenient for loading, unloading and replacement.

Further, referring to Fig. 2 and Fig. 6, as a specific embodiment of the magnetic deslimer provided by the present invention, a top cover for sealing is provided above the feed hopper 1, and a top cover for sealing is provided in the middle of the top cover. The observation hole for observation is provided with a cover plate 15 which can be opened. Among them, one end of the cover plate is hinged with the edge of the observation hole, and the other end is movably connected with the top cover. Open the cover plate to check the slurry flow in the feeder. Cover the cover plate when not in use to prevent the slurry from splashing and keep the site clean.

Further, referring to Fig. 1, Fig. 5 and Fig. 7, as a specific embodiment of the magnetic desilter provided by the present invention, the overflow trough 2 is provided with an overflow trough cover, and the overflow trough cover is provided with An observation hole for observation; one side wall of the overflow tank 2 is provided with a mud concentration transmitter 3 for detecting the overflow mud concentration, and the other side of the overflow tank 2 is provided with an overflow port 5; The side wall of the outlet hopper 4 is provided with a pulp concentration transmitter 11 for detecting the pulp concentration. By detecting the concentration of mud and ore pulp online, the quality of iron ore can be better monitored.

Further, please refer to Figures 9 and 10, as a specific embodiment of the magnetic desilter provided by the present invention, the uniform flow water supply device includes a water distribution pipe 19, a buffer chamber 20, a connecting pipe 22 and a water supply pipe 23. The water supply pipe 23 is arranged outside the cylinder body 7, the buffer chamber 20 is arranged in the cylinder body 7, and communicates with the water supply pipe 23 through the connection pipe 22; Around the chamber 20, the water distribution pipe 19 is arranged horizontally and communicates with the buffer chamber 20. The water distribution pipe 19 is provided with a water distribution port 21 for water outlet on the same side clockwise or counterclockwise relative to the buffer chamber 20. The water entering the buffer chamber through the water supply pipe can disperse the water flow through the water distribution pipe arranged in a rim shape, and the water flow can be sprayed out along the same direction as the circumference of the buffer chamber through the water distribution port, so as to provide the cylinder body with a uniform flow on the entire cross section. Spiral upward water flow, fully mixed with the falling slurry.

To further optimize the above technical solution, see FIG. 10 , the water diversion port 21 is several horizontally parallel round holes, several horizontally parallel slits or strip-shaped long slits to speed up the water flow. Utilizing the water diversion port of this structure can make the water flow evenly disperse and spray out.

As a further preferred solution, the cylinder body 7 and the auxiliary inner tube 29 are non-magnetic material cylinders, and the cylinder body and the auxiliary inner tube made of non-magnetic materials can reduce the loss of magnetic force lines, which is more conducive to the main The magnetic field lines of the excitation coil and the auxiliary excitation coil are conducted to the inside of the cylinder to increase the magnetic field strength in the cylinder, so that the magnetic minerals in the slurry can fall along the inner wall of the cylinder to be discharged from the hopper, and high-grade iron ore can be obtained.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (10)

1. The magnetic deslimer is characterized in that: it includes a cylinder, a feeder, an overflow tank and a uniform water supply device, and the feeder for injecting slurry into the cylinder and the overflow tank for discharging mud are uniform It is installed on the top of the cylinder, and the uniform flow water supply device for feeding water into the cylinder is installed at the bottom of the cylinder; the outside of the cylinder is provided with a main excitation coil, and the bottom of the cylinder is provided with a discharge hopper with a pulp valve; The feeder includes a feeding hopper and a feeding pipe, the feeding hopper is arranged on the upper end of the feeding pipe, the outlet of the feeding pipe is arranged in the middle of the inner cavity of the cylinder, and the feeding pipe is provided with a uniform outlet material structure. 2. The magnetic deslimer according to claim 1, characterized in that: the uniform discharge structure is a conical homogenizer, the tip of the conical homogenizer faces upwards, and the outer conical surface passes through a plurality of connecting plates It is connected with the inner wall of the feeding tube, and the connecting plate is radially distributed along the outer wall of the conical homogenizer, one side of the connecting plate is connected with the inner wall of the feeding tube, and the other side of the connecting plate is connected with the conical homogenizer. The outer walls of the feeders are connected, and the lower edge of the drop tube is arranged above the lower edge of the conical homogenizer. 3. The magnetic deslimer according to claim 1, characterized in that: the uniform discharge structure is a ring-shaped homogenizer, and the ring-shaped homogenizer includes a plurality of inclined downward diffuser Material pipe, the upper end of the material distribution pipe is radially distributed on the lower end of the discharge pipe, the lower end of the material distribution pipe is connected to the annular distribution pipe, and the annular distribution pipe is horizontally arranged in the middle of the cylinder. Several uniformly distributed discharge ports are arranged on the lower surface of the annular distribution pipe. 4. The magnetic deslimer according to claim 3, characterized in that: the middle part of the distribution pipe and the annular distribution pipe is provided with a closed auxiliary inner pipe, and an auxiliary excitation coil is arranged in the auxiliary inner pipe, and the auxiliary excitation coil is arranged in the auxiliary inner pipe. The upper end of the auxiliary inner pipe is connected to the lower end of the material drop pipe, and the material distribution pipe surrounds the auxiliary inner pipe. 5. The magnetic deslimer according to claim 1, characterized in that: the inside of the drop pipe is provided with an inner cylinder whose lower end extends to the middle of the cylinder, and the uniform discharge structure is arranged in several The feeding passage between the outer wall of the inner cylinder and the inner wall of the falling pipe, and the overflow passage between two adjacent feeding passages, the feeding passage and the overflow passage are connected with the inside of the cylinder The upper end of the feed channel communicates with the feed hopper, and the outer end of the overflow channel communicates with the overflow tank. 6. The magnetic deslimer according to claim 2 or 3, characterized in that: a feed pipe for slurry injection is arranged tangentially on the outer circle of the feed hopper, and a feed pipe for slurry injection is arranged in the feed hopper. A slurry-guided helical deflector disposed above the feed pipe. 7. The magnetic deslimer according to claim 1, characterized in that: the discharge hopper is an inverted cone, and an inverted cone wear-resistant cone is provided between the bottom of the discharge hopper and the pulp valve, and the wear-resistant The side of the grinding cone is provided with a flushing port for backwashing the discharge hopper. 8. The magnetic deslimer as claimed in claim 1, characterized in that: a top cover for sealing is provided above the feed hopper, and an observation hole for observation is provided in the middle of the top cover, and on the observation hole There is a cover that can be opened. 9. The magnetic desilter as claimed in claim 1, characterized in that: said overflow tank is provided with an overflow tank cover, said overflow tank cover is provided with an observation hole for observation, said overflow tank One side wall of the tank is provided with a mud concentration transmitter for detecting the concentration of the overflowing mud, and the other side of the overflow tank is provided with an overflow port; the side wall of the hopper is provided with a slurry sensor for detecting the concentration of the slurry. concentration transmitter. 10. The magnetic desilter according to any one of claims 1-5, 7-9, characterized in that: the uniform flow water supply device includes a water distribution pipe, a buffer chamber, a connecting pipe and a water supply pipe, and the water supply pipe It is arranged outside the cylinder body, the buffer chamber is arranged in the cylinder body, and communicates with the water supply pipe through a connecting pipe; the water distribution pipe is more than two, and is arranged radially around the buffer chamber, and the water distribution pipe is arranged horizontally, and It communicates with the buffer chamber, and the water diversion pipe is provided with a water diversion port for water outlet on the same side clockwise or counterclockwise relative to the buffer chamber.