CN117181358A - Air-float sludge iron element extraction and preparation device and preparation method thereof - Google Patents

Abstract

The application relates to the technical field of iron element extraction and preparation devices, in particular to an air floatation sludge iron element extraction and preparation device which comprises a first fixed frame, wherein one side of the first fixed frame is fixedly connected with a second fixed frame, one side of the second fixed frame is provided with a third fixed frame, the top of the first fixed frame is fixedly connected with a sludge crushing mechanism, one side of the crushing mechanism is provided with a screening mechanism, the top of the second fixed frame is provided with a rolling mechanism, the top of the third fixed frame is provided with an iron element extraction mechanism, and the crushing rollers in a crushing box body are driven by the rotation of a driving motor, so that two groups of crushing rollers facilitate the crushing of air floatation sludge in the crushing box body, and simultaneously, the two groups of crushing rollers drive crushing strips on the outer side to crush the air floatation sludge, so that the iron element in the air floatation sludge is convenient to extract and prepare later for later use, and after the crushing is finished, the full subsequent iron element extraction processing is facilitated.

Description

An air flotation sludge iron element extraction and preparation device and its preparation method

Technical field

The invention relates to the technical field of iron element extraction and preparation devices, specifically an iron element extraction and preparation device for air flotation sludge and a preparation method thereof.

Background technique

When air flotation sludge is processed, it needs to be separated and dehydrated through air flotation concentration. Air flotation concentration is the opposite of gravity concentration. It relies on a large number of tiny bubbles to adhere around the sludge particles, reducing the specific gravity of the particles and forcing them to float. Therefore, the air flotation method is especially suitable for sludge with a specific gravity close to 1g/cm3. Air flotation concentration causes the gas dissolved in water to be released in the form of microbubbles, and can quickly and evenly adhere to the solid particles of the sludge, so that The density of solid particles is smaller than that of water and causes floating, thus achieving the separation of solid particles and water. The separated sludge needs better dehydration treatment.

Among them, "a method and device for selective extraction and recovery of chromium elements in electroplating sludge" disclosed in the application number "CN114517261B" is also an increasingly mature technology. Its "method includes: S1. Dehydrate and dry the electroplating sludge in sequence. , roasting and pulverizing to obtain sludge particles to be leached; S2. Mix the sludge particles to be leached with the sulfuric acid solution, then heat, ultrasonic treat, and then filter; S3. Add ethanol solution to the leachate treated in step S2 , and mix evenly, and then perform gasification treatment to obtain gas phase chromium element; finally, the gas phase chromium element is passed into the ferrous sulfate heptahydrate solution for reaction to form trivalent chromium precipitate, and the trivalent chromium precipitate can be separated; this method The invented method is reasonably designed, has a high recovery rate of chromium elements in electroplating sludge, realizes the resource utilization of electroplating sludge, and has significant economic and environmental benefits." However, the device still has the following defects during actual use:

This kind of extraction device cannot extract the iron elements in the sludge. The traditional air flotation sludge iron extracts the iron elements in the air flotation sludge iron through chemical reactions. During the extraction reaction, chemical sewage will be produced. Flows to the surrounding environment causing pollution.

Contents of the invention

The object of the present invention is to provide an air flotation sludge iron element extraction and preparation device and a preparation method thereof to solve the problems raised in the above background technology.

In order to achieve the above object, the present invention provides the following technical solution: an air flotation sludge iron element extraction and preparation device, including a first fixed frame, a second fixed frame fixedly connected to one side of the first fixed frame, and the second fixed frame is fixedly connected to one side of the first fixed frame. A third fixed frame is provided on one side of the two fixed frames. A sludge crushing mechanism is fixedly connected to the top of the first fixed frame. A screening mechanism is provided on one side of the crushing mechanism. The top of the second fixed frame is A rolling mechanism is provided, and an iron element extraction mechanism is provided on the top of the third fixed frame.

Preferably, the crushing mechanism includes a crushing box fixedly connected to the top of the first fixed frame, the top of the crushing box is connected with a feed hopper, and two sets of symmetrically arranged crushing boxes are installed inside the crushing box. Crushing rollers, one end of the two sets of crushing rollers is fixedly connected to the transmission end of the drive motor provided on the side of the crushing box. The bottom end of the crushing box is fixedly connected to a lower hopper. One side of the lower hopper Baffle plates are interspersed and connected, and a crushing strip is fixedly connected to the outside of each crushing roller.

Preferably, the screening mechanism includes a first servo motor fixedly connected to the bottom end of the first fixed frame, the transmission end of the first servo motor is fixedly connected to a transmission shaft, and one end of the transmission shaft is fixedly connected to a driving gear. , the outer side of the driving gear is connected with a chain, the inner side of the chain is meshed with the gear ring, the inner side of the gear ring is fixedly connected with a screening drum, and both ends of the screening drum are fixedly connected with circular rails The bottom end of the circular rail groove is rollingly connected to the roller provided on the top of the first fixed frame. There are several screening holes on the outside of the screening drum. The bottom end of the screening drum is provided with A collecting plate fixedly connected to the first fixed frame.

Preferably, the rolling mechanism includes a second servo motor fixedly connected to the top side of the second fixed frame, a drive end of the second servo motor fixedly connected to a driving roller, and the position of the driving roller is correct. A driven rotating shaft is provided at opposite positions, a conveyor belt is connected to the outer side of the driving rotating roller and the driven rotating roller, a supporting frame is fixedly connected to the top of the second fixed frame, and the top of the supporting frame is movably connected. There is a first electric telescopic rod, the telescopic end of the first electric telescopic rod is movably connected with a mounting frame, and one end of the mounting frame is movably connected with a pressing roller.

Preferably, the iron element extraction mechanism includes a third servo motor fixedly connected to the top side of the third fixed frame, a driving shaft fixedly connected to the transmission end of the third servo motor, and the position of the driving shaft is facing There is a driven rotating shaft, and a magnetic conveyor belt is connected to the outer side of the driving rotating shaft and the driven rotating shaft. An iron scraper is arranged at one end of the bottom of the third fixed frame, and an iron scraper is arranged at the bottom end of the iron scraper. Receiving box.

Preferably, a switch panel is fixedly connected to the side of the first fixed frame, the surface of the switch panel is provided with a protective layer, and the surface of the switch panel is provided with a first electric telescopic rod control switch and a second servo motor control switch. switch, the first servo motor control switch and the drive motor control switch. The first electric telescopic rod, the second servo motor, the first servo motor and the drive motor are respectively controlled by the first electric telescopic rod switch and the second servo motor control switch. , the first servo motor control switch and the drive motor control switch are electrically connected to the external power supply.

Preferably, a method for extracting iron elements from air flotation sludge includes a device for extracting iron elements from air flotation sludge described in 1-7 above, including the following steps:

Step 1: Screen the particles. When the air-floating sludge is screening particles and stones that cannot be crushed inside, the rotation of the first servo motor drives the transmission shaft to rotate, causing the driving gear to rotate and drive the chain to rotate, which facilitates the gear ring. It is meshed and driven with the chain to facilitate the screening drum to screen out the stone particles inside the crushed air flotation sludge through the screening holes.

Step 1: Iron element processing and extraction, rolling and pressing the crushed and screened air flotation sludge to increase the expansion area of the air flotation sludge, thereby facilitating the iron element extraction mechanism to extract the iron elements inside the air flotation sludge. Extraction, through the cooperation between the second servo motor and the active roller, it is convenient for the pressing roller to press and flatten the crushed air-floated sludge transported on the conveyor belt, so as to facilitate the full extraction of the extraction elements.

beneficial effects

The invention provides an air flotation sludge iron element extraction and preparation device and a preparation method thereof, which have the following beneficial effects:

1) The rotation of the drive motor drives the crushing rollers inside the crushing box, so that the two sets of crushing rollers facilitate the crushing of the air-floating sludge inside the box. At the same time, the two sets of crushing rollers rotate to drive the outer crushing strips to crush the air. The floating sludge is crushed to facilitate the extraction and preparation of iron elements inside the air flotation sludge for later use. After the crushing is completed, it is convenient for the subsequent extraction and processing of iron elements.

2) The rotation of the third servo motor drives the active rotating shaft to rotate, so that the magnetic conveyor belt, with the cooperation of the driven rotating shaft, facilitates the adhesion and adhesion of the iron elements inside the flat air flotation sludge, and the adsorbed air flotation sludge The mud conveyor slides out, and when the magnetic conveyor belt adsorbed with iron elements passes through the iron scraper, the iron elements on the magnetic conveyor belt are scraped out and fall to the inside of the receiving box for collection.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is one of the structural schematic diagrams of the present invention;

Figure 3 is a schematic structural diagram of the crushing mechanism of the present invention;

Figure 4 is a schematic structural diagram of the screening mechanism of the present invention;

Figure 5 is a schematic structural diagram of the rolling mechanism of the present invention;

Figure 6 is a schematic structural diagram of the iron element extraction mechanism of the present invention;

Figure 7 is a schematic structural diagram of the scraper plate of the present invention.

In the figure: 1. First fixed frame; 101. Second fixed frame; 102. Third fixed frame; 2. Crushing mechanism; 201. Crushing box; 202. Feed hopper; 203. Crushing roller; 204. Drive Motor; 205. Lower hopper; 206. baffle; 207. Crushing bar; 3. Screening mechanism; 301. First servo motor; 302. Transmission shaft; 303. Driving gear; 304. Chain; 305. Gear ring; 306 , screening drum; 3061, circular rail groove; 307, collecting plate; 308, screening opening; 4, rolling mechanism; 401, second servo motor; 402, active roller; 403, driven roller; 404. Conveyor belt; 405. Support frame; 406. First electric telescopic rod; 407. Installation frame; 408. Pressing roller; 5. Iron element extraction mechanism; 501. Third servo motor; 502. Active rotating shaft; 503. Slave Moving shaft; 504, receiving box; 505, magnetic conveyor belt; 506, iron scraper.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It is to be understood that the figures so used are interchangeable under appropriate circumstances so that the embodiments of the present application can be practiced in orders other than those illustrated or described herein, and that "first," "second," etc. are distinguished Objects are usually of one type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and/or" in the description and claims indicates at least one of the connected objects, and the character "/" generally indicates that the related objects are in an "or" relationship.

In the description of the present invention, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the following. It is intended that devices or elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "setting" should be understood in a broad sense. For example, it can be fixedly connected or set, or it can be Detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

Please refer to Figures 1-7. The present invention provides a technical solution: an air flotation sludge iron element extraction and preparation device, including a first fixed frame 1, and a second fixed frame 101 is fixedly connected to one side of the first fixed frame 1 , a third fixed frame 102 is provided on one side of the second fixed frame 101, a sludge crushing mechanism 2 is fixedly connected to the top of the first fixed frame 1, a screening mechanism 3 is provided on one side of the crushing mechanism 2, and the second fixed frame The top of the third fixed frame 101 is provided with a rolling mechanism 4, and the top of the third fixed frame 102 is provided with an iron element extraction mechanism 5.

The crushing mechanism 2 includes a crushing box 201 fixedly connected to the top of the first fixed frame 1. The top of the crushing box 201 is connected with a feed hopper 202. Two sets of symmetrically arranged crushing rollers are installed inside the crushing box 201. 203. One end of the two sets of crushing rollers 203 is fixedly connected to the transmission end of the drive motor 204 provided on the side of the crushing box 201. The bottom end of the crushing box 201 is fixedly connected to a lower hopper 205, and one side of the lower hopper 205 is connected through and through. There is a baffle plate 206, and a crushing bar 207 is fixedly connected to the outside of each crushing roller 203.

During specific use, the air-floating sludge can be put into the inside of the crushing box 201 through the feeding hopper 202 on the crushing mechanism 2, and the inside of the crushing box 201 can be driven by the rotation of the drive motor 204 on the side of the crushing box 201. The crushing rollers 203 of the two sets of crushing rollers 203 rotate to crush the air-floating sludge inside the crushing box 201. The rotation of the two sets of crushing rollers 203 drives the outer crushing bars 207 to crush the air-floating sludge. The crushing is convenient for extracting the iron elements inside the air flotation sludge for later use. After the crushing is completed, the baffle plate 206 inserted through the lower hopper 205 is pulled, so that the lower hopper 205 can unload the sludge and carry out subsequent iron element extraction. extraction processing.

The screening mechanism 3 includes a first servo motor 301 fixedly connected to the bottom end of the first fixed frame 1. The transmission end of the first servo motor 301 is fixedly connected to a transmission shaft 302, and one end of the transmission shaft 302 is fixedly connected to a driving gear 303. The outer side of the gear 303 is connected with a chain 304, and the inner side of the chain 304 is meshed with the gear ring 305. The inner side of the gear ring 305 is fixedly connected with a screening drum 306, and both ends of the screening drum 306 are fixedly connected with circular rail grooves 3061. The bottom end of the circular rail groove 3061 is rollingly connected to the roller provided on the top of the first fixed frame 1. A number of screening holes 308 are provided on the outside of the screening drum 306. The bottom end of the screening drum 306 is provided with a plurality of screening holes 308 on both sides. The collecting plate 307 is fixedly connected to the fixed frame 1 .

In specific use, when the air flotation sludge is screening particles that cannot be crushed inside, the rotation of the first servo motor 301 drives the transmission shaft 302 to rotate, so that the driving gear 303 at one end of the transmission shaft 302 rotates. The chain 304 rotates, so that the gear ring 305 and the chain 304 are engaged and driven, so that the screening drum 306 rolls and rotates with the rollers on the first fixed frame 1 through the two outer circular rail grooves 3061, which is convenient for the screening drum 306 The gravel particles inside the crushed air flotation sludge are screened out through the screening holes 308 .

The rolling mechanism 4 includes a second servo motor 401 fixedly connected to the top side of the second fixed frame 101. The transmission end of the second servo motor 401 is fixedly connected to an active rotating roller 402. The active rotating roller 402 is positioned opposite to the second fixed frame 101. There is a driven rotating shaft 403. A conveyor belt 404 is drivingly connected to the outside of the driving rotating roller 402 and the driven rotating roller 403. The top of the second fixed frame 101 is fixedly connected to a supporting frame 405, and the top of the supporting frame 405 is movably connected to a third supporting frame 405. An electric telescopic rod 406, the telescopic end of the first electric telescopic rod 406 is movably connected with a mounting bracket 407, and one end of the mounting bracket 407 is movably connected with a pressing roller 408.

In specific use, the crushed and screened air flotation sludge is rolled and pressed to increase the expansion area of the air flotation sludge, thereby facilitating the iron element extraction mechanism 5 to extract the iron element inside the air flotation sludge. The rotation of the second servo motor 401 drives the active roller 402 to rotate. The rotation of the active roller 402 facilitates the rotation of the conveyor belt 404 to transport the air-floated sludge. Through the first electric telescopic switch on the support frame 405 The telescopic movement of the rod 406 pushes the pressing roller 408 on the mounting frame 407, so that the pressing roller 408 presses and flattens the crushed air-floated sludge transmitted on the conveyor belt 404 to facilitate the extraction of the extraction elements.

The iron element extraction mechanism 5 includes a third servo motor 501 fixedly connected to the top side of the third fixed frame 102, and an active rotating shaft 502 fixedly connected to the transmission end of the third servo motor 501. The active rotating shaft 502 is positioned opposite The driven shaft 503 has a magnetic conveyor belt 505 connected to the outer side of the driving shaft 502 and the driven shaft 503. An iron scraper 506 is provided at one end of the bottom of the third fixed frame 102, and a scraper 506 is provided at the bottom end of the scraper 506. Box 504.

During specific use, the rotation of the third servo motor 501 drives the driving shaft 502 to rotate, and the magnetic conveyor belt 505 cooperates with the driven shaft 503 to facilitate adsorption and adhesion of iron elements inside the flattened air flotation sludge. , and the adsorbed air-floating sludge slides out. When the magnetic conveyor belt 505 adsorbed with iron elements passes through the iron scraper 506, the iron elements on the magnetic conveyor belt 505 are scraped out and fall to the receiving box 504. Material collection is done internally.

A switch panel is fixedly connected to the side of the first fixed frame 1. The surface of the switch panel is provided with a protective layer. The surface of the switch panel is provided with a first electric telescopic rod control switch, a second servo motor control switch, and a first servo motor control switch. and the drive motor control switch. The first electric telescopic rod 406, the second servo motor 401, the first servo motor 301 and the drive motor 204 are respectively controlled by the first electric telescopic rod control switch, the second servo motor control switch and the first servo motor. The switch and drive motor control switch are electrically connected to the external power supply.

A method for extracting and preparing iron elements from air flotation sludge, including a device for extracting and preparing iron elements from air flotation sludge described in 1-8 above, which is characterized in that it includes the following steps:

Step 1: Screen the particles. When the air-floating sludge is screening particles and stones that cannot be crushed inside, the rotation of the first servo motor 301 drives the transmission shaft 302 to rotate, causing the driving gear 303 to rotate and drive the chain 304 to rotate. , to facilitate the gear ring 305 and the chain 304 to mesh and drive, so that the screening drum 306 can screen out the stone particles inside the crushed air-floating sludge through the screening holes 308.

Step 1: Iron element processing and extraction, rolling and pressing the crushed and screened air flotation sludge to increase the expansion area of the air flotation sludge, thereby facilitating the iron element extraction mechanism 5 to extract the iron elements inside the air flotation sludge During extraction, the cooperation between the second servo motor 401 and the active roller 402 facilitates the pressing roller 408 to press and flatten the crushed air-floated sludge transported on the conveyor belt 404, thereby facilitating the full extraction of the extraction elements.

It should be noted that, in this document, the terms "comprising", "comprises" or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article or device that includes a series of elements not only includes those elements, It also includes other elements not expressly listed or inherent in the process, method, article or apparatus. Without further limitation, an element defined by the statement "comprises a..." does not exclude the presence of additional identical elements in a process, method, article or apparatus that includes that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions may be performed, for example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Inspired by this application, many forms can be made without departing from the purpose of this application and the scope protected by the claims, all of which fall within the protection of this application.

Claims (8)

1. An air flotation sludge iron element extraction and preparation device, including a first fixed frame (1), characterized in that a second fixed frame (101) is fixedly connected to one side of the first fixed frame (1), A third fixed frame (102) is provided on one side of the second fixed frame (101), and a sludge crushing mechanism (2) is fixedly connected to the top of the first fixed frame (1). The crushing mechanism (2) 2) is provided with a screening mechanism (3) on one side, a rolling mechanism (4) is provided on the top of the second fixed frame (101), and an iron element extraction mechanism is provided on the top of the third fixed frame (102) (5). 2. An air flotation sludge iron element extraction and preparation device according to claim 1, characterized in that: the crushing mechanism (2) includes a crushing box (1) fixedly connected to the top of the first fixed frame (1). 201), a feeding hopper (202) is connected through the top of the crushing box (201), and two sets of symmetrically arranged crushing rollers (203) are installed inside the crushing box (201). One end of the crushing roller (203) is fixedly connected to the transmission end of the drive motor (204) provided on the side of the crushing box (201), and the bottom end of the crushing box (201) is fixedly connected to a lower hopper (205). , a baffle plate (206) is connected to one side of the lower hopper (205), and a crushing strip (207) is fixedly connected to the outside of each crushing roller (203). 3. An air flotation sludge iron element extraction and preparation device according to claim 2, characterized in that: the screening mechanism (3) includes a first servo fixedly connected to the bottom end of the first fixed frame (1). Motor (301), the transmission end of the first servo motor (301) is fixedly connected with a transmission shaft (302), one end of the transmission shaft (302) is fixedly connected with a driving gear (303), and the driving gear (303) ) is connected with a chain (304) on the outside, and the inside of the chain (304) is meshed with the gear ring (305). The inside of the gear ring (305) is fixedly connected with a screening drum (306). The screen Circular rail grooves (3061) are fixedly connected to both ends of the dividing drum (306). The bottom end of the circular rail groove (3061) is rollingly connected to the rollers provided on the top of the first fixed frame (1). The screening Several screening openings (308) are provided on the outside of the drum (306), and collecting plates (307) fixedly connected to the first fixed frame (1) are provided on both sides of the bottom end of the screening drum (306). 4. An air flotation sludge iron element extraction and preparation device according to claim 2, characterized in that: the rolling mechanism (4) includes a third fixed frame fixedly connected to the top side of the second fixed frame (101). Two servo motors (401). The transmission end of the second servo motor (401) is fixedly connected with a driving roller (402). A driven rotating shaft (403) is provided directly opposite the driving roller (402). , a conveyor belt (404) is connected to the outer side of the driving roller (402) and the driven roller (403), and a support frame (405) is fixedly connected to the top of the second fixed frame (101). A first electric telescopic rod (406) is movably connected to the top of the support frame (405), and a mounting bracket (407) is movably connected to the telescopic end of the first electric telescopic rod (406). The mounting bracket (407) One end is movably connected with a pressing roller (408). 5. An air flotation sludge iron element extraction and preparation device according to claim 1, characterized in that: the iron element extraction mechanism (5) includes an iron element fixedly connected to the top side of the third fixed frame (102). The third servo motor (501) has an active rotating shaft (502) fixedly connected to the transmission end of the third servo motor (501), and a driven rotating shaft (503) is provided directly opposite the active rotating shaft (502). A magnetic conveyor belt (505) is connected to the outside of the driving shaft (502) and the driven shaft (503), and an iron scraper (506) is provided at one end of the bottom of the third fixed frame (102). A receiving box (504) is provided at the bottom of the scraper plate (506). 6. An air flotation sludge iron element extraction and preparation device according to claim 4, characterized in that: a switch panel is fixedly connected to the side of the first fixed frame (1). 7. An air flotation sludge iron element extraction and preparation device according to claim 6, characterized in that: the surface of the switch panel is provided with a protective layer, and the surface of the switch panel is provided with a first electric telescopic rod control switch, the second servo motor control switch, the first servo motor control switch and the drive motor control switch, the first electric telescopic rod (406), the second servo motor (401), the first servo motor (301) and the drive motor (204) are electrically connected to the external power supply through the first electric telescopic rod control switch, the second servo motor control switch, the first servo motor control switch and the drive motor control switch respectively. 8. A method for extracting and preparing iron elements from air flotation sludge, including the device for extracting and preparing iron elements from air flotation sludge described in 1-7 above, which is characterized in that it includes the following steps: Step 1: Screen the particles. When the air flotation sludge is screening particles and stones that cannot be crushed inside, the rotation of the first servo motor (301) drives the transmission shaft (302) to rotate, causing the driving gear (303) to rotate. The rotation drives the chain (304) to rotate, which facilitates the meshing and transmission of the gear ring (305) and the chain (304), so that the screening drum (306) can screen the gravel particles inside the crushed air-floating sludge to open holes (308). Perform screening. Step 1: Iron element processing and extraction, rolling and pressing the crushed and screened air flotation sludge to increase the expansion area of the air flotation sludge, thereby facilitating the iron element extraction mechanism (5) to extract the air flotation sludge inside the air flotation sludge. The iron element is extracted, and through the cooperation between the second servo motor (401) and the active roller (402), it is convenient for the pressing roller (408) to press and spread the crushed air-floated sludge transmitted on the conveyor belt (404). Flat, easy to fully extract the elements.