CN110980896A - Rotating conical surface magnetic separation device and separation method - Google Patents
Rotating conical surface magnetic separation device and separation method Download PDFInfo
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- CN110980896A CN110980896A CN201911164818.6A CN201911164818A CN110980896A CN 110980896 A CN110980896 A CN 110980896A CN 201911164818 A CN201911164818 A CN 201911164818A CN 110980896 A CN110980896 A CN 110980896A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/48—Devices for applying magnetic or electric fields
Abstract
The invention discloses a rotary conical surface magnetic separation device and a separation method, wherein the device comprises a belt scraper system and a magnetic conical surface separation system, and a plurality of layers of separation beds are arranged in the device along the vertical direction; the magnetic conical surface sorting system is characterized in that a main body of the magnetic conical surface sorting system is a sorting bed with a conical structure, a feeding port and a water inlet are formed in the top of the sorting bed, a magnetic material outlet, a non-magnetic material outlet and a transmission device are formed in the bottom of the sorting bed, and the sorting bed is formed by processing permanent magnets; the belt scraper system adopts the continuous movement of a conveying belt and a scraper to uninterruptedly unload materials; the device organically combines a magnetic field, a gravitational field and mechanical force, and is applied to the efficient separation of magnetic particles; the device is used for wastewater or ore pulp, the process is simple, the operation is convenient, the energy consumption is low, the feeding can be continuously processed, and the industrial production is met.
Description
Technical Field
The invention relates to a rotary conical surface magnetic separation device and a separation method, and belongs to the field of water treatment.
Background
Since the national improvement committee proposed the law of energy conservation and emission reduction in 2007, more and more people proposed the gold points of energy conservation and emission reduction. In addition to the phenomenon of frequent occurrence of natural disasters and great climate change in recent years, the nation has proposed the concept of "low carbon" in 2008, and more people have announced low carbon life in this year. Along with the rapid development of economy, the treatment rate of urban sewage and industrial wastewater in China is also improved year by year, and simultaneously, a large amount of sludge is generated in the treated sewage and wastewater, and it is understood that in 2009, a municipal sewage treatment plant in China has 1992, the annual sewage treatment capacity reaches 280 hundred million m3, and the generated sludge with the water content of 80 percent is about 2005 ten thousand tons.
The problem of high-efficiency solid-liquid separation is inevitably faced in the water treatment process, and the traditional solid-liquid separation technology mainly focuses on the aspects of filtration, filter pressing, gravity settling and the like. First, in the filtration technology, a disc filter is basically used industrially, solid and liquid are separated by vacuum to form a filter cake, and the filtrate is recycled, but the effect of dewatering viscous materials is poor. The sedimentation technology has wide application range and can be seen everywhere in concentrating plants and water plants, such as various sedimentation tanks, clarification tanks, concentration tanks and the like. The settling process and the equipment used are relatively simple, making gravity settling the least expensive of the various solid-liquid separation techniques. Some materials which are difficult to filter can be effectively separated by means of a sedimentation method, but the separation efficiency is low, the occupied area is large, and the treatment effect on ultrafine particles is not ideal. The drying and separating technology is mainly used for concentrate dehydration in cold areas to prevent vehicles from being frozen. The screening separation technology is mainly applied to the dehydration of large materials. Although the traditional solid-liquid separation technology plays an important role in the development of the industrial and mining industries of various countries in the world, the development of the times requires that more advanced and accurate solid-liquid separation technology is applied to modern industrial and mining enterprises and even family life.
The water treatment solid suspended substance has the characteristics of low solid content, fine granularity, low specific gravity and the like, and the traditional solid-liquid separation is difficult to achieve the ideal effect. The magnetic separation technology is a physical separation method for separating substances with different magnetism by means of the action of magnetic field force. The magnetic separation technology is a relatively old and mature technology, and is applied to mineral separation and porcelain clay industry for the earliest time. In 1845, the U.S. patented an industrial magnetic separator. Magnetic separation technology is widely applied to the fields of ore concentration, coal desulfurization, iron removal of glass, cement and the like, kaolin purification, cell separation in biological engineering, catalyst recovery in petrochemical industry and the like as a means for sorting two or more substances with magnetic differences [1-6 ]. The magnetic separation technology is used for water treatment engineering, and can be called as an emerging technology. From the 60 s of the last century, the soviet union treated the dust removal wastewater of steel mills by magnetic coagulation, at the end of the 60 s, the high gradient magnetic filter of the commander of crom in MIT of the united states, and the wastewater of steel, food, chemical industry, paper making and the like by magnetic flocculation and high gradient magnetic separation in the united states in the 70 s. In 1974 sweden began treating steel rolling wastewater by the disk method, followed by the development of a disk type "two-second separator" in japan in 75 years. In China, from the middle of the 70 s to the beginning of the 80 s, a magnetic coagulation method, a magnetic disk method and a high-gradient magnetic separation method are used for treating steel-making and steel-rolling wastewater. In recent years, magnetic separation technology has achieved certain research results in the treatment of electroplating wastewater, phenol-containing wastewater, lake water, food fermentation wastewater, municipal wastewater, steel wastewater, kitchen wastewater, slaughter wastewater, petroleum produced water and the like, and some of the magnetic separation technology has been well applied to actual wastewater treatment.
The technology is called as 'magnetic coagulation magnetic separation' or 'magnetic loading magnetic separation' technology, the magnetic inoculation technology obtains a deep research in the field of mineral magnetic separation, is used for separating minerals with different magnetism, technologists synthesize a large amount of selective magnetic carriers, in the field of wastewater treatment, the magnetic seeds do not have the requirement of selectivity, generally requires that ① has stronger magnetism, ② is easy to recycle and reuse, in the application aspect, Fe3O4 is used for treating glass grinding wastewater by adopting a 2-second separator and a coagulation technology, the removal rate reaches more than 99%, Pb, F, BOD, Zhengzhen 3 and the like, magnetic powder is used for treating wastewater, magnetic powder is used for obtaining magnetic powder, magnetic powder adsorption magnetic powder, and the like, the wastewater treatment process can greatly reduce the water turbidity of urban wastewater containing heavy metals by adopting a magnetic adsorption magnetic powder flocculation technology, and a special magnetic sedimentation technology, and a magnetic powder adsorption technology, and a special magnetic powder adsorption technology, namely a magnetic powder adsorption magnetic powder is used for treating wastewater in a municipal magnetic wastewater treatment plant, wastewater containing wastewater, a special magnetic adsorption and a magnetic sedimentation technology, a magnetic adsorption technology, a special magnetic adsorption technology, a magnetic separation, a magnetic adsorption technology, a magnetic separation, a magnetic.
In the last two decades, high gradient magnetic filtration technology has been actively studied and has been used to solve many environmental and industrial problems, such as: filtering the cooling water of the nuclear reactor, removing phosphate in the water, recovering hematite, ferrochrome ore powder and superfine powder, removing metals in the wastewater and the like. The magnetic separation equipment further drives related application research, and the application field of the magnetic separation equipment in water treatment engineering is expanded due to the combination of the magnetic separation technology and other technologies. The magnetic separation equipment mainly comprises two types of HGMS and disc type magnetic separators. HGMS is characterized by high gradient, and ReMagdiscTM in the disc separator is characterized by high field intensity, and has been developed. The superconducting magnetic separator has the characteristics of both, but the practical application is not mature. Since Kolm et al succeeded in developing the 1 st high-gradient magnetic separation experimental device at the end of the 60's 20 th century, the development of high-gradient magnetic separators has been rapidly developed. At present, various high-gradient magnetic separators have been developed at home and abroad, such as Sala type high-gradient magnetic separator, VMS type high-gradient magnetic separator, Jones-like SHP series wet-type strong magnetic separator, Slon type pulsating high-gradient vertical ring magnetic separator, SSS-II double-frequency pulse double-vertical ring high-gradient magnetic separator and DMG type vertical ring pulsating high-gradient magnetic separator, which are all electromagnetic systems, so that the structure is complex, the manufacturing cost is high and the energy consumption is high. With the development of high-performance rare earth permanent magnetic materials, the progress of superconducting technology and the need of energy conservation, the high-gradient magnetic separator tries to use permanent magnets and superconductors in magnetic system selection, such as a iron wheel type permanent magnetic high-gradient magnetic separator, a CRIMM type double-box reciprocating permanent magnetic high-gradient magnetic separator and a superconducting high-gradient magnetic separator.
The strong magnetic field of the high-gradient magnetic separator depends on magnetic media, and the dense arrangement of the magnetic media limits the separation space. The higher magnetic field of the electromagnetic high-gradient magnetic separator corresponds to higher energy consumption, and meanwhile, the space is small and easy to block, so that the processing capacity of the electromagnetic high-gradient magnetic separator is severely limited. Therefore, how to improve the structure of the high-gradient magnetic separator, improve the processing capacity and reduce the energy consumption has great significance for solving the water treatment problem in China and even the world.
Disclosure of Invention
Aiming at the defects of high cost, low efficiency and the like of the solid-liquid separation technology in the prior art, the invention aims to provide the magnetic solid-liquid separation device which can realize solid-liquid separation quickly and efficiently at low cost.
The invention also aims to provide a method for separating magnetic particles in wastewater or ore pulp, which can realize solid-liquid separation quickly and efficiently at low cost, has simple process and convenient operation and meets the requirement of industrial production.
In order to achieve the technical purpose, the invention provides a rotary conical surface magnetic separation device which comprises a belt scraper system, a magnetic conical surface separation system and a discharge hopper, wherein the belt scraper system, the magnetic conical surface separation system and the discharge hopper are fixed on the ground, the discharge hopper is arranged at the bottom of the magnetic conical surface separation system, the discharge hopper is provided with a magnetic material area and a non-magnetic material area which are mutually independent, the magnetic conical surface separation system comprises a plurality of layers of separation beds which are arranged along the vertical direction, the separation beds are conical in shape, the upper surfaces of the separation beds are inclined planes, the plurality of layers of separation beds are coaxially sleeved on a rotating shaft which is vertically arranged and are linked with the rotating shaft, the rotating shaft is driven to rotate through a bed surface driving system, the belt scraper system comprises a plurality of conveying belts, a belt scraper driving device for driving the conveying belts to rotate and a plurality of scrapers arranged on the conveying belts, each layer of separation, The magnetic material sorting device comprises a nonmagnetic material sorting area and a magnetic material sorting area, wherein a discharge port of the nonmagnetic material sorting area and a discharge port of the magnetic material sorting area are arranged on the edge of the excircle of a sorting bed, the discharge port of the nonmagnetic material sorting area is arranged right above a feed port of a nonmagnetic material area of a discharge hopper, the discharge port of the magnetic material sorting area is arranged right above a feed port of the magnetic material area of the discharge hopper, each layer of sorting bed is provided with at least one impact water pipe on the nonmagnetic material sorting area, a water outlet of the impact water pipe faces the nonmagnetic material sorting area, a conveying belt is radially arranged in the magnetic material sorting area along the sorting bed, the distance between a scraper on the conveying belt and the sorting bed is smaller than the diameter of materials, and the conveying belt drives the scraper to scrape the materials out of the discharge port of the magnetic material sorting area.
Furthermore, the sorting bed is provided with three layers.
Furthermore, the inclination angle of the sorting bed is 10-30 degrees.
Furthermore, the angular speed of the sorting bed is 2-3 r/min.
Furthermore, the scraping plates are uniformly distributed on the conveying belt at intervals in a strip shape, and the scraping plates are in contact with the bed surface.
Further, the water outlet of the impact water pipe is arranged at the top of the sorting disc.
A method for separating magnetic particles in waste water or ore pulp is characterized in that the rotary conical surface magnetic separation device is utilized, materials enter a separation bed from a feeding area respectively, the separation bed is started to rotate, a belt scraper system and an impact water pipe are started simultaneously, the separation bed rotates to a non-magnetic material separation area firstly, the non-magnetic particles on the separation bed fall into the non-magnetic material separation area from a discharge hole of the non-magnetic material separation area under the action of impact water flow, then the separation bed rotates to a magnetic material separation area, the magnetic particles on the separation bed fall into the magnetic material separation area from a discharge hole of the magnetic material separation area under the action of the belt scraper system, and then the magnetic particles are discharged from a discharge hopper respectively.
The design principle is based on: the rotary sorting bed is mainly based on a magnetic separation principle, magnetic components are adsorbed on a bed surface under the action of a permanent magnet, and the magnetic components are driven by a scraper to move out of the bed surface towards the edge direction of the bed surface; in the aspect of nonmagnetic components, under the action of gravity and water flow, the nonmagnetic components are strongly acted by mechanical force on the sorting bed and leave the bed surface in a fixed area, so that the separation of the magnetic components and the nonmagnetic components is realized.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the rotating conical surface magnetic separation device organically combines mechanical force, magnetic force and gravity, and can effectively realize the separation of magnetic particles and nonmagnetic particles. The conical surface magnetic separation device enables the magnetic solid particles to be simultaneously subjected to mechanical force, gravity and magnetic force in the separation process, and the solid particles move downwards along the bed surface direction under the action of the gravity, the mechanical force and the magnetic force of the solid particles, so that the magnetic particles are quickly and efficiently gathered. The conical surface magnetic separation device disclosed by the invention combines mechanical force, gravity and magnetic force, overcomes the problems of overlarge scale, high energy consumption and the like of the existing magnetic separation system, and realizes the efficient separation of magnetic particles and nonmagnetic particles.
2. The rotary conical surface magnetic separation device comprises three separation beds which are vertically arranged, two kinds of particles can be simultaneously separated in the separation beds, the device is simple in arrangement, and the particle separation can be realized quickly, efficiently and at low cost.
3. The rotating conical surface magnetic separation device can be continuously operated in the particle treatment process, has simple process and convenient operation, and meets the requirement of industrial production.
Drawings
FIG. 1 is a schematic cross-sectional view of a rotating conical magnetic separation device of the present invention.
Fig. 2 is a top view of the rotating conical surface magnetic separation device of the present invention.
The device comprises a rotating shaft 1, a sorting bed 2, a bed surface supporting guide rail 3, a discharge hopper 4, a support 5, a support 6, a bed surface driving system 7, a belt scraper driving device 8, a belt scraper system 9, an impact water pipe 10, a feeding area 11, a nonmagnetic material sorting area 12, a magnetic material sorting area, a magnetic material outlet A and a magnetic material outlet B and a nonmagnetic material outlet.
Detailed Description
The present invention is further described in detail with reference to the accompanying drawings and embodiments, and for the purpose of more clearly illustrating the embodiments of the present patent or the technical solutions in the prior art, the drawings required for use in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to these drawings without creative effort.
As shown in fig. 1. The rotary conical surface magnetic separation device comprises a belt scraper system 8 fixed on the ground, a magnetic conical surface separation system and a discharge hopper. The magnetic conical surface sorting system comprises sorting beds 22 which are arranged along the vertical direction and have conical structures, the sorting beds 2 are conical, the upper surfaces of the sorting beds are inclined planes, the discharge hopper is arranged at the bottom of the magnetic conical surface sorting system and is provided with a magnetic material area and a non-magnetic material area which are mutually independent, the bottom of the discharge hopper 4 in the magnetic material area and the bottom of the non-magnetic material area are respectively provided with a magnetic material outlet A and a non-magnetic material outlet B, three layers of sorting beds 2 are coaxially sleeved on a rotating shaft 1 which is vertically arranged and are linked with the rotating shaft 1, the sorting beds 2 are supported on bed surface supporting guide rails 3 through rollers to form rolling connection, the bed surface supporting guide rails 3 are supported on the ground through brackets 5, and the rotating shaft 1 drives the sorting beds 2 to rotate on the bed surface supporting guide rails 3 through a bed surface driving system 6, the belt scraper system 8 comprises a plurality of conveying belts, a belt scraper driving device 7 for driving the conveying belts to rotate and a plurality of scrapers arranged on the conveying belts, wherein each layer of the sorting bed 2 is sequentially provided with a feeding area 10, a non-magnetic material sorting area 11 and a magnetic material sorting area 12 along the rotating direction of the sorting bed 2, a discharge port of the non-magnetic material sorting area and a discharge port of the magnetic material sorting area are arranged at the edge of the excircle of the sorting bed 2, a discharge port of the non-magnetic material sorting area is arranged right above a feed port of the non-magnetic material sorting area of the discharge hopper, a discharge port of the magnetic material sorting area is arranged right above a feed port of the magnetic material sorting area of the discharge hopper, each layer of the sorting bed 2 is provided with at least one impact water pipe 9 on the non-magnetic material sorting area, and a water outlet of the impact water pipe faces the non-magnetic material sorting area, the conveying belt is radially arranged in the magnetic material separation area along the separation bed 2, the distance between a scraper on the conveying belt and the separation bed 2 is smaller than the diameter of the material, the conveying belt drives the scraper to scrape the material from a discharge hole of the magnetic material separation area, and the belt scraper system 8 uninterruptedly scrapes the material on the magnetic material separation area from the discharge hole through the continuous movement of the conveying belt and the scraper, so that the material enters the magnetic material area of the discharge hopper 4 and is discharged from a magnetic material outlet A of the discharge hopper 4.
The process of the invention for treating a mixture containing magnetic particles and non-magnetic particles is as follows:
the material enters the sorting bed from the feeding area 10, the bed surface driving system 6 is started to drive the sorting bed 2 to rotate, meanwhile, the belt scraper driving device 7 is started, the impact water pipe 9 is opened, firstly, impact water flow in the impact water pipe 9 flushes nonmagnetic granular materials in the nonmagnetic material sorting area 11 from the sorting bed 2, the nonmagnetic granular materials fall into a nonmagnetic material area of the discharge hopper 4, the belt scraper system 8 scrapes magnetic granular materials on the sorting bed 2 from the sorting bed 2 in the magnetic material sorting area 12, the magnetic granular materials fall into a magnetic material area of the discharge hopper 4, then the magnetic materials are discharged from the magnetic material outlet A, the nonmagnetic materials are discharged from the nonmagnetic material outlet B, and therefore separation of the magnetic solid particles and the nonmagnetic particles is achieved.
Example 1:
most (70-80%) of the phosphorus-containing components in the phosphorus-containing starch wastewater are phosphate radicals, and the small part (20-30%) of the phosphorus-containing components are phosphorus-containing organic matters. Ca. Metal ions such as Fe and the like can form phosphate precipitates with phosphate radicals, so that most of the phosphate radicals are effectively removed, but the precipitates are fine in particle size, strong in dispersity and extremely difficult to settle and filter, and the problem can be perfectly solved by a super-magnetic separation technology; the magnetic crystal nucleus with specific granularity has certain adsorption capacity on organic phosphorus and can be used as a supermagnetic separation crystal nucleus to play a key role in the purification treatment of phosphorus-containing starch wastewater. The purification scheme of the biochemical phosphorated starch wastewater of Ming Yang is a magnetic fluid crystal nucleus induction technology, and the specific parameters are as follows: lime (pH9-10) or ferric salt to purify phosphate radical, 20mg/L of magnetic crystal nucleus TK1 less than 1g/L, PFS, and 20mg/L of flocculating agent PAM10-15 mg/L.
A purification step: adding lime and magnetic crystal nucleus TK1, and mechanically stirring at 150r/min for 5 min; PFS is added, and mechanical stirring is carried out for 5min at the rotating speed of 150 r/min; adding PAM, and mechanically stirring at a speed of 100r/min for 5 min; then magnetic separation is carried out by utilizing the device. The results of the assay are shown in tables 1 and 2. The purification results show that: the phosphorus purification rate reaches 90%, COD is reduced to a certain extent (due to higher biochemical degradation efficiency, deep consideration is not made), the purification efficiency of national suspended substances is greatly improved by introducing the magnetic crystal nucleus, and the content of the solid suspended substances is 23 mg/L.
TABLE 1 starch wastewater purification test results
| TP/mg/L | CODcr/mg/L | SS/mg/L | |
| Raw water | 134.34 | 6387.69 | - |
| After treatment | 16.88 | 5661.54 | 23.00 |
TABLE 2 Metal ion content of purified starch wastewater
Note: in the table, "- - -" indicates no detection.
Example 2:
the rotary conical surface magnetic separation device is utilized, ethanol and stearic acid are selected to modify Fe3O4 with the mass fraction of more than 98 percent, the rotary conical surface magnetic separation device is used for treating oil polluted natural deep well underground water, and the effluent can meet the water quality standard of industrial water by combining an activated carbon adsorption method.
Example 3:
the device is used for treating urban sewage, ferroferric oxide with the purity of more than 98% is selected as a magnetic seed, and under the combined action of coagulant aluminum sulfate and coagulant aid PAM, the removal rates of phosphorus and COD in the sewage are respectively 98.35% and 70.8%. If the magnetic powder commonly used in the coal preparation plant is used as the magnetic seed, the flocculating settling test is carried out on the slime water by combining the flocculating agent. The result shows that the magnetic induction intensity is 0.25T, the magnetic seed consumption is 0.3g, and the sedimentation speed of the coal slime water and the turbidity of the supernatant fluid are effectively improved.
In addition, it should be noted that the present patent is not limited to the above embodiments, as long as the components do not have specific sizes or shapes, the components can have any sizes or shapes corresponding to the structures, and no matter any changes are made on the material composition, the structural design provided by the present invention is a modification of the present invention, and should be considered as being within the protection scope of the present invention.
Claims (7)
1. A kind of rotary conical surface magnetic separation device, characterized by: the magnetic conical surface sorting system comprises a multi-layer sorting bed arranged in the vertical direction, the sorting bed is a cone which is formed by processing a permanent magnet and has an inclined upper surface, the multi-layer sorting bed is coaxially sleeved on a rotating shaft which is vertically arranged and is linked with the rotating shaft, the rotating shaft is driven to rotate by a bed surface driving system, the belt scraper system comprises a plurality of conveying belts, a belt scraper driving device for driving the conveying belts to rotate and a plurality of scrapers arranged on the conveying belts, and each layer of the sorting bed is sequentially provided with a feeding area, a nonmagnetic material sorting area and a magnetic material sorting area along the rotating direction of the sorting bed, the material outlet of the non-magnetic material sorting area and the material outlet of the magnetic material sorting area are arranged on the edge of the outer circle of the sorting bed, the material outlet of the non-magnetic material sorting area is arranged right above the material inlet of the non-magnetic material area of the discharge hopper, the material outlet of the magnetic material sorting area is arranged right above the material inlet of the magnetic material area of the discharge hopper, at least one impact water pipe is arranged on each layer of sorting bed in the non-magnetic material sorting area, the water outlet of the impact water pipe faces the non-magnetic material sorting area, the conveying belt is radially arranged in the magnetic material sorting area along the sorting bed, the distance between the scraping plate on the conveying belt and the sorting bed is smaller than the diameter of the material, and the conveying belt drives the scraping plate to scrape the material out of the material outlet of the magnetic material sorting area.
2. A rotating conical surface magnetic separation device according to claim 1, characterized in that: the sorting bed is provided with three layers.
3. A rotating conical surface magnetic separation device according to claim 1, characterized in that: the inclination angle of the sorting bed is 10-30 degrees.
4. A rotating conical surface magnetic separation device according to claim 1, characterized in that: the angular speed of the sorting bed is 2-3 r/min.
5. A rotating conical surface magnetic separation device according to claim 1, characterized in that: the scrapers are uniformly distributed on the conveying belt at intervals in a strip shape and are in contact with the bed surface.
6. A rotating conical surface magnetic separation device according to claim 1, characterized in that: and the water outlet of the impact water pipe is arranged at the top of the sorting disc.
7. A method for separating magnetic particles in waste water or pulp, using a rotating conical surface magnetic separation device according to any one of claims 1 to 6, characterized in that: the material gets into the sorting bed respectively from the feed district, it is rotatory to start the sorting bed, open belt scraper blade system and impact the water pipe simultaneously, at first the sorting bed rotates to nonmagnetic material sorting district, the nonmagnetic particle thing on the sorting bed falls into nonmagnetic material district from the discharge gate in nonmagnetic material sorting district under the effect of impact rivers, then the sorting bed rotates to magnetic material sorting district, the magnetic particle thing falls into magnetic material district from the discharge gate in magnetic material sorting district under the effect of belt scraper blade system on the sorting bed, then discharge respectively from the play hopper.
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