Steel slag fine aggregate processing production line

Abstract

The application discloses a kind of steel slag fine aggregate processing production line, including sequentially connected in process storehouse, vibrating feeder, feeding conveyor, hanging magnet, electromagnetic roller, feeding conveyor, first vibrating screen, demagnetization selection conveyor, first double-roll magnetic separator, screening conveyor, probability screen, aggregate conveyor, feeding screw machine;Steel slag enters storehouse after being fed to feeding conveyor by vibrating feeder to feeding conveyor, then sequentially through hanging magnet, electromagnetic roller, feeding conveyor, first vibrating screen is screened, and magnetic separation is carried out by first double-roll magnetic separator, and different particle size aggregate is obtained by passing through screening conveyor into probability screen.The aggregate obtained by using the production line of the application has good particle shape, continuous grading proportion relationship, and related particle size is uninterrupted, can fully fill the void between aggregate, has very low powder content, can meet the requirements of asphalt road coarse aggregate, and has important significance for the development of highway construction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel slag processing and production, in particular, the present application relates to a kind of steel slag fine aggregate processing production line. BACKGROUND

[0002] China's annual steel slag production is nearly 100 million tons, due to unstable volume, high phosphorus and sulfur impurity content, large grinding energy consumption and other reasons, the current utilization channel is narrow, the comprehensive utilization rate is low, generally use grinding powder as admixture to add to steel slag cement for use, the amount of admixture is very small, resulting in a large amount of steel slag can only be stacked to form industrial solid waste. Steel slag treatment process has cold disposal method, disc water cooling method, hot splashing method, water quenching method, air quenching method, hot steaming method, roller method and pressurized steam aging method, etc. Among them, the cold disposal method has long aging time, and the treated steel slag has large block size, which is not conducive to the utilization and processing of steel slag; The disc water cooling method has high cost and serious pollution; The water quenching and air quenching methods are prone to explosion and are not conducive to operation. These methods have not been popularized on a large scale at home and abroad.

[0003] The commonly used method for domestic steel slag treatment at present is hot splashing method, roller method and hot steaming method. The cold disposal method is to pour the steel slag into a slag tank and then directly transport it to the slag field for disposal. Although this process has small investment and few equipment, it is not conducive to the processing and reasonable utilization of steel slag, and sometimes the slag discharge is not smooth, which affects steelmaking. The hot splashing method is to pour the steel slag into a slag tank, then transport it to a steel slag hot splashing workshop by vehicle, use a crane to pour the molten slag in the slag tank layer by layer onto a slag bed, cool it to 350-400℃ by air, then spray an appropriate amount of water to make the steel slag rapidly cool and crack, and then transport it to a slag disposal field or a steel slag treatment workshop for process treatment such as crushing, screening and magnetic separation. The hot splashing method requires large loading and excavating machinery, has large equipment wear and tear, occupies large area, generates large amount of dust during crushing, and has large steel slag processing capacity. The above-mentioned methods will generate a large amount of waste material, and cannot realize full processing and utilization of steel slag, so the utilization rate of steel slag is low.

[0004] In view of the above, there is an urgent need to develop a steel slag fine aggregate processing production line to realize full processing and utilization of steel slag, improve the economic value of steel slag, turn waste into treasure, and completely solve the pollution problem of steel slag to the environment. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a steel slag fine aggregate processing production line to realize full processing and utilization of steel slag, improve the economic value of steel slag, turn waste into treasure, and completely solve the pollution problem of steel slag to the environment.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] The utility model provides a kind of steel slag fine aggregate processing production line, including sequentially connected procedure bin, vibration feeder, feeding conveyor, hanging magnet, electromagnetic roller, feeding conveyor, first vibrating screen, demagnetization selection conveyor, first double-roll magnetic separator, screening conveyor, probability screen, aggregate conveyor, feeding screw machine;Steel slag enters the bin after the vibration feeder is fed to the feeding conveyor by the bin, the hanging magnet for the top side of the feeding conveyor is hung and is used to attract the iron-containing particles in steel slag to surface, the steel slag after the hanging magnet is then carried out magnetic separation of iron-containing material by the electromagnetic roller, and is conveyed to the first vibrating screen by the feeding conveyor, and is screened, and the screened steel slag is conveyed to the first double-roll magnetic separator by the demagnetization selection conveyor for magnetic separation, and the steel slag after magnetic separation is conveyed to the probability screen by the screening conveyor for screening, and the steel slag aggregate of different particle sizes after screening is conveyed to the yard by the corresponding aggregate conveyor respectively, and the powdered material after screening is conveyed to the storage container by the feeding screw machine.

[0008] In the above scheme, in another improved scheme, a crusher, a discharge conveyor and a second vibrating screen are further sequentially arranged between the first vibrating screen and the demagnetization selection conveyor, the steel slag with a diameter less than or equal to a predetermined size after screening by the first vibrating screen is conveyed to the demagnetization selection conveyor through the under-screen conveyor, the steel slag with a diameter greater than the predetermined size after screening by the first vibrating screen is crushed by the crusher, the crushed steel slag is conveyed to the screening conveyor through the discharge conveyor, and the steel slag after screening by the screening conveyor is conveyed to the probability screen. Second vibrating screen The steel slag with a diameter less than or equal to the predetermined size after re-screening is conveyed to the first double-roll magnetic separator by the demagnetization selection conveyor for magnetic separation.

[0009] In the above scheme, in another improved scheme, a return conveyor is further arranged between the second vibrating screen and the crusher, the steel slag with a diameter greater than the predetermined size after re-screening by the second vibrating screen is conveyed to the crusher by the return conveyor for re-crushing.

[0010] In the above scheme, in another improved scheme, a de-shaping conveyor and a shaper are further sequentially arranged between the first double-roll magnetic separator and the screening conveyor, the steel slag after magnetic separation from the first double-roll magnetic separator is conveyed to the shaper by the de-shaping conveyor, and the steel slag after shaping from the shaper is conveyed to the probability screen by the screening conveyor for screening.

[0011] In the above scheme, in another improved scheme, a re-magnetic selection conveyor and a second double-roll magnetic separator are further arranged between the shaper and the screening conveyor, the steel slag after shaping from the shaper is conveyed to the second double-roll magnetic separator by the re-magnetic selection conveyor for re-magnetic selection, and is conveyed to the probability screen by the screening conveyor.

[0012] In another improved scheme based on the above scheme, a first dust collector is further included for sucking out the dust in the probability screen, and a screw conveyor is further included for conveying the sucked-out dust to the storage container.

[0013] In another improved scheme based on the above scheme, an elevator and a loading screw machine are further included, the feeding screw machine sends the screened dust in the probability screen to the elevator, the elevator sends the dust to the storage container, and the loading screw machine is used for loading the powdered material in the storage container for transportation.

[0014] In another improved scheme based on the above scheme, a closed box and a second dust collector are further included, the first vibrating screen, the under-screen conveyor belt, the crusher, the discharge conveyor belt, the return conveyor belt and the second vibrating screen are located in the closed box, and the second dust collector is arranged on the closed box and used for sucking out the dust in the closed box.

[0015] In another improved scheme based on the above scheme, a screen base, a screen box, a material stabilizing bin, a double-channel material distributing mechanism and a vibrating mechanism are included, the screen box is flexibly connected to the screen base, a gate valve is installed at the bottom opening of the material stabilizing bin, the vibrating mechanism is used for driving the screen box to vibrate, one end of the screen box is a feeding end, and the other end is a discharge end, at least two layers of screen meshes are sequentially arranged in the screen box from top to bottom, at least two discharge chutes are arranged at the discharge end and correspond to the screen meshes one by one, the double-channel material distributing mechanism includes a double-channel material distributor, a power unit and a double-channel material distributing partition plate, the double-channel material distributor is arranged between the gate valve and the feeding end of the screen box, the power unit is used for driving the double-channel material distributor to vibrate, a vertical partition plate is arranged in the double-channel material distributor, the partition plate separates the interior of the double-channel material distributor into two vertical material guide grooves, and the double-channel material distributing partition plate is arranged above the topmost screen mesh in the screen box.

[0016] In another improved scheme based on the above scheme, a lock air valve is arranged at each discharge chute, a dust suction port is arranged at the top of the screen box, an air inlet is arranged at the bottom of the screen box, and a wind pipe of the first dust collector is connected to the dust suction port; the screen mesh is a rhombic screen mesh, and the short axis length of the rhombic screen mesh is 1.1-1.2 times the particle size of the required screening material.

[0017] The technical scheme of the present application has the following beneficial technical effects:

[0018] The steel slag fine aggregate processing production line of the application processes the steel slag into medium and fine aggregates and ore fines of different diameters through processes such as magnetic separation, crushing, shaping and screening. The medium and fine aggregates of the steel slag have the characteristics of rough surface, good wear resistance, good anti-skid performance, good durability, large bulk density, good stability, high-temperature resistance, low-temperature resistance, no cracking and good adhesion with asphalt. Through the special physical stone crushing technology, the fine aggregate processed has the characteristics of good particle shape, continuous grading proportion relationship, uninterrupted related particle size, can fully fill the voids between aggregates, low powder content, and the fine aggregate particles obtained through the matching powder suction and wind sweeping device have clean surface, can meet the requirements of asphalt road coarse aggregate, can replace basalt, diabase and the like for road paving, can alleviate the problem of lack of asphalt road coarse aggregate, reduce the overdevelopment of natural resources, benefit the future generations, green environmental protection, reduce the road construction cost, and develop the steel slag as road coarse aggregate, realize the recycling of industrial solid waste, and have important significance for the development of road construction. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification. The illustrations are shown to explain the present application and are not intended to be an improper limitation of the present application.

[0020] Figure 1 The figure is a schematic diagram of the steel slag fine aggregate processing production line in Example 1.

[0021] Figure 2 The figure is a schematic diagram of the steel slag fine aggregate processing production line in Example 2.

[0022] Figure 3 The figure is a schematic diagram of the steel slag fine aggregate processing production line in Example 3.

[0023] Figure 4 The figure is a schematic diagram of the steel slag fine aggregate processing production line in Example 4.

[0024] Figure 5 The figure is a schematic diagram of the steel slag fine aggregate processing production line in Example 5 (the dashed box indicates a closed box).

[0025] Figure 6 The figure is a schematic diagram of the steel slag fine aggregate processing production line in Example 9.

[0026] Figure 7 The figure is a schematic diagram of the production process of the steel slag fine aggregate processing production line in Example 9.

[0027] Reference signs:

[0028] 1 - stock bin 2 - vibrating feeder 3 - feeding conveyor

[0029] 4 - Hanging magnet 5 - Electromagnetic roller 6 - Feeding conveyor

[0030] 7 - First vibrating screen 8 - Stabilizing hopper 9 - Cone crusher

[0031] 10 - Second dust collector 11 - Under-screen conveyor 12 - Second vibrating screen

[0032] 13 - Return conveyor 14 - Discharge conveyor 15 - Demagnetizing conveyor

[0033] 16 - First double-roll magnetic separator 17 - De-shaping conveyor 18 - Slag-iron conveyor I

[0034] 19 - Shaping machine 20 - Re-magnetizing conveyor 21 - Second double-roll magnetic separator

[0035] 22 - Slag-iron conveyor II 23 - Sieving conveyor 24 - Stabilizing bin

[0036] 25 - Double-path distributor 26 - Sieve box 27 - First dust collector

[0037] 28 - Feeding auger 29 - Aggregate product conveyor 30 - Aggregate product

[0038] 31 - Slag-iron 32 - Probability screen 33 - Dust can

[0039] 34 - Loading auger 35 - Screw conveyor 36 - Silencer

[0040] 37 - Loading dust collector 38 - Elevator DETAILED DESCRIPTION

[0041] The present application will be described in detail below with reference to the drawings, which are only exemplary and explanatory, and should not have any limiting effect on the scope of protection of the present application. In addition, those skilled in the art can combine the features of the embodiments in the present document and the features of different embodiments according to the description of the present document.

[0042] Example 1

[0043] Reference is made to the accompanying drawings Figure 1The steel slag fine aggregate processing production line in the embodiment includes a bin 1, a vibrating feeder 2, a feeding conveyor belt 3, a hanging magnet, an electromagnetic roller 5, a feeding conveyor belt 6, a first vibrating screen 7, a demagnetization selection conveyor belt 15, a first double-roller magnetic separator 16, a screening conveyor belt 23, a probability screen 32, an aggregate product conveyor belt 29, and a feeding screw 28, which are sequentially connected in a process. After the steel slag enters the bin 1, the steel slag is fed to the feeding conveyor belt 6 through the vibrating feeder 2. The hanging magnet hung on the top side of the feeding conveyor belt 6 is used to attract the iron-containing particles in the steel slag to the surface. The steel slag passing through the hanging magnet is then subjected to magnetic separation by the electromagnetic roller 5. The steel slag is then conveyed to the first vibrating screen 7 through the feeding conveyor belt 6 for screening. The screened steel slag is then subjected to magnetic separation by the first double-roller magnetic separator 16 through the demagnetization selection conveyor belt 15. The steel slag after magnetic separation is then screened by the probability screen 32 through the screening conveyor belt 23. The steel slag aggregate products 30 of different particle sizes are conveyed to the stockyard through the corresponding aggregate product conveyor belts 29 after screening. The powdered material after screening is conveyed to the storage container through the feeding screw 28. In the embodiment, a powder tank 33 is used as the storage container. In other embodiments, other containers or directly placing the powdered material in the designated stockyard can also be used.

[0044] With reference to the accompanying drawings Figure 1 In the improved example of the embodiment, the probability screen 32 is further connected with a first dust remover 27, and the first dust remover 27 is connected with a screw conveyor 35. The first dust remover 27 is used to attract the dust in the probability screen 32, and the screw conveyor 35 is used to convey the dust to the powder tank 33. The first dust remover 27 is further provided with a silencer 36 to reduce the noise.

[0045] With reference to the accompanying drawings Figure 1 In the improved example of the embodiment, a hoist 38 and a loading screw 34 are further provided. The feeding screw 28 sends the screened dust in the probability screen 32 to the hoist 38, and the hoist 38 sends the dust to the powder tank 33. The loading screw 34 is used to load the powdered material in the powder tank 33 for transportation. The loading screw 34 is further provided with a loading dust remover 38 to reduce the spread of dust during loading.

[0046] The steel slag selected in the embodiment is Xiangtan Steel converter steel slag, which has hot granulation and hot splashing. After initial crushing and preliminary magnetic separation, it is stored in the open air for more than six months and is subjected to necessary inspection before processing. The quality indicators should meet the quality requirements of Table 4.8.2 and the specification requirements of 4.8.3 in the Technical Specification for Highway Asphalt Pavement Construction of the Ministry of Communications. The various detection indicators of the steel slag to be processed should meet the requirements of the specification, and then the steel slag fine aggregate processing production line in the embodiment is used for processing. The main control indicators of the steel slag include that the free calcium oxide content is not more than 3%, the water immersion expansion is not more than 2%, the water content is controlled to be less than 3%, and the specifications of various grades are reasonable during processing.

[0047] The steel slag fine aggregate processing production line in the embodiment is provided with two hoppers 1, and each hopper 1 is provided below with a vibrating feeder 2. The steel slag to be treated after detection and meeting the requirements is loaded into the hopper 1 and falls down through the vibrating feeder 2; a hanging magnet 4 is arranged above the feeding conveyor belt 3 to remove the iron blocks in the steel slag through the magnetic attraction, and the slag iron 31 is removed through the electromagnetic roller 5; the steel slag after the iron removal is vibrated again through the first vibrating screen 7, and the steel slag with a diameter less than or equal to a predetermined size (the predetermined size in the embodiment is 25 mm) is screened out; the slag iron 31 after the magnetic separation is sent to the slag iron yard through the slag iron conveying belt one 18; and the steel slag after the magnetic separation is sent to the probability screen 32 for screening. In other improved embodiments, manual impurity removal can be performed on the feeding conveyor belt 3, so that the impurities are avoided from entering the subsequent processing links.

[0048] The probability screen 32 in the embodiment is provided with four layers of screen meshes, and can screen the steel slag after the magnetic separation into four kinds of aggregate products with different diameters for use in the road asphalt pavement construction. The steel slag fine aggregate processing production line in the embodiment has high strength, rough surface, good wear resistance, good anti-skid performance, good durability, large specific gravity, good stability, high temperature resistance, low temperature resistance, no cracking, and good adhesion with the asphalt; the fine aggregate has good particle shape, continuous grading proportion relationship, uninterrupted related particle size, can fully fill the voids between the aggregate products, has very low powder content, is provided with a powder suction and sweeping device to make the particle surface clean, can meet the requirements of the asphalt pavement coarse aggregate, and compared with the basalt aggregate used in the asphalt pavement in China, firstly, the basalt production area has limited yield, and secondly, the basalt belongs to a natural non-renewable resource, and the production cost and transportation cost from mining to processing into the asphalt pavement aggregate are high, nearly 500 yuan per ton, while the steel slag aggregate produced through the production line can completely replace the basalt, greatly reduces the material cost in the asphalt pavement construction process, and the steel slag aggregate belongs to industrial solid waste and is inexhaustible, which can greatly alleviate the problem of shortage of asphalt pavement coarse aggregate, and the use of the steel slag aggregate to construct the asphalt pavement has very high economic value.

[0049] The steel slag fine aggregate processing production line in the embodiment involves various devices which are products in the prior art, and the belt and motor are used as the conveying belt between the devices, and the specific structure and working principle of the devices and the conveying belt are not described in detail.

[0050] Embodiment 2

[0051] Referring to the drawings Figure 2The steel slag processing production line in the embodiment adds the step of steel slag shaping on the basis of the steel slag processing production line in Embodiment 1. The steel slag that has completed the magnetic separation from the first double-roller magnetic separator 16 is conveyed to the shaper 19 through the de-shaping conveying belt 17, and the steel slag that has completed the shaping from the shaper 19 is conveyed to the probability screen 32 through the screening conveying belt 23. Through the step of steel slag shaping, the steel slag that has completed the magnetic separation is shaped, the irregularly shaped steel slag is shaped to enter the probability screen 32 for screening, the screen is not easy to be blocked, and the screening efficiency is improved.

[0052] Embodiment 3

[0053] Referring to the accompanying drawings, Figure 3 The steel slag processing production line in the embodiment adds the steps of steel slag crushing and second vibration screening after crushing on the basis of the steel slag processing production line in Embodiment 1. The crusher, the discharging conveying belt 14 and the second vibration screen 12 are sequentially arranged between the first vibration screen 7 and the de-magnetic separation conveying belt 15. The steel slag with a diameter less than or equal to the predetermined size after the screening of the first vibration screen 7 is conveyed to the de-magnetic separation conveying belt 15 through the undersize conveying belt 11. The steel slag with a diameter greater than the predetermined size after the screening of the first vibration screen 7 is crushed in the crusher. The crushed steel slag is conveyed to the second vibration screen 12 through the discharging conveying belt 14 for second screening. The steel slag with a diameter less than or equal to the predetermined size after the second screening is conveyed to the first double-roller magnetic separator 16 through the de-magnetic separation conveying belt 15 for magnetic separation. The special conical crusher 9 for steel slag is adopted in the embodiment, the steps of steel slag crushing and second vibration screening after crushing are arranged, the utilization of large-particle steel slag is realized, and the utilization rate of the steel slag is improved.

[0054] Embodiment 4

[0055] Referring to the accompanying drawings, Figure 4 The steel slag processing production line in the embodiment adds the step of re-crushing of large-diameter steel slag after the second vibration screening after crushing on the basis of the steel slag processing production line in Embodiment 3. The re-material conveying belt 13 is arranged between the second vibration screen 12 and the crusher. The steel slag greater than the predetermined size after the second screening of the second vibration screen 12 is conveyed to the crusher through the re-material conveying belt 13 for re-crushing. In this way, the large-particle steel slag is fully crushed, and the steel slag is fully utilized.

[0056] Embodiment 5

[0057] Referring to the accompanying drawings, Figure 5The steel slag fine aggregate processing production line in the embodiment further comprises a closed box and a second dust collector 10 based on the steel slag fine aggregate processing production line in Embodiment 4. The first vibrating screen 7, the under-screen conveying belt 11, the crusher, the discharge conveying belt 14, the return conveying belt 13 and the second vibrating screen 12 are arranged in the closed box, and the second dust collector 10 is arranged on the top of the closed box and communicates with the inside of the closed box. In this way, the second dust collector 10 can absorb the dust in the closed box when the second dust collector 10 works, so that the dust generated in the crushing process can be prevented from polluting the air, and the environmental protection requirement can be met.

[0058] Embodiment 6

[0059] The steel slag fine aggregate processing production line in the embodiment further comprises a closed box and a second dust collector 10 based on the steel slag fine aggregate processing production line in Embodiment 4. The first vibrating screen 7, the under-screen conveying belt 11, the crusher, the discharge conveying belt 14, the return conveying belt 13 and the second vibrating screen 12 are arranged in the closed box, and the second dust collector 10 is arranged on the top of the closed box and communicates with the inside of the closed box. In this way, the second dust collector 10 can absorb the dust in the closed box when the second dust collector 10 works, so that the dust generated in the crushing process can be prevented from polluting the air, and the environmental protection requirement can be met.

[0060] Embodiment 7

[0061] The steel slag fine aggregate processing production line in the embodiment is a combination of the steel slag fine aggregate processing production line in Embodiment 2 and the steel slag fine aggregate processing production line in Embodiment 4. That is, the steel slag entering the feeding conveying belt 6 is crushed by the first vibrating screen 7, the crusher (the crushed steel slag can be crushed again according to the requirement), the second vibrating screen 12, and the first double-roller magnetic separator 16. The steel slag, from which the magnetic separation is completed in the first double-roller magnetic separator 16, is conveyed to the shaping machine 19 by the de-shaping conveying belt 17, the steel slag, from which the shaping is completed in the shaping machine 19, is conveyed to the probability screen 32 by the screening conveying belt 23. In this way, the steel slag with a large diameter can be fully crushed into small particles, and the irregularly shaped steel slag can be shaped and then screened by the probability screen 32, so that the screen is not easily blocked.

[0062] Embodiment 8

[0063] The steel slag fine aggregate processing production line in the embodiment is a combination of the steel slag fine aggregate processing production line in Embodiment 6 and the steel slag fine aggregate processing production line in Embodiment 7. That is, the steel slag entering the feeding conveying belt 6 is crushed by the first vibrating screen 7, the crusher (the crushed steel slag can be crushed again according to the requirement), the second vibrating screen 12, and the first double-roller magnetic separator 16. The steel slag, from which the magnetic separation is completed in the first double-roller magnetic separator 16, is conveyed to the shaping machine 19 by the de-shaping conveying belt 17, the steel slag, from which the shaping is completed in the shaping machine 19, is conveyed to the second double-roller magnetic separator 21 by the re-magnetic separation conveying belt 20 for re-magnetic separation, and then the steel slag is conveyed to the probability screen 32 by the screening conveying belt 23.

[0064] Example 9

[0065] The steel slag premium aggregate processing production line in this example is a combination of Example 5 and Example 8. The combination of the drawings of Figure 6 and the drawings of Figure 7 (since the conveying belts in this example are all motor-driven belt structures, Figure 7 the term "belt" is used instead of "conveying belt" in the process flow of the steel slag premium aggregate processing production line in this example to simplify the text description in the process diagram), the process of processing steel slag in the steel slag premium aggregate processing production line in this example is briefly introduced as follows:

[0066] The steel slag is loaded into the bin 1 by the loader, a vibrating feeder 2 is arranged below the bin 1, the material is fed to the feeding conveyor belt 3 through the vibrating feeder 2, various impurities are removed by manual selection, a hanging magnet 4 and an electromagnetic roller 5 are arranged on the front section of the feeding conveyor belt 3 to perform magnetic separation of the iron-containing material (remove the slag iron in the steel slag to prevent the slag iron from entering the crusher and damaging the blade), then the material is conveyed to the first vibrating screen 7 through the feeding conveyor belt 6 to perform screening, the material larger than 25 mm is screened onto the first vibrating screen 7 and enters the special cone crusher 9 for the steel slag, the material smaller than or equal to 25 mm is conveyed to another magnetic separation conveyor belt 15 through the under-screen conveyor belt 11 to perform magnetic separation. The upper-layer material screened on the first vibrating screen 7 enters the cone crusher 9, and the particle size of the material discharged from the discharge port is controlled and adjusted, the material is conveyed to the second vibrating screen 12 through the under-screen conveyor belt 11 under the cone crusher 9 to perform screening, the material with a diameter larger than 25 mm is returned to the upper stable hopper 8 of the cone crusher 9 through the return conveyor belt 13 to be crushed again. The material smaller than or equal to 25 mm screened on the second vibrating screen 12 is conveyed to the first double-roller magnetic separator together with the material screened on the first vibrating screen 7 through the under-screen conveyor belt 11, and the rotation speed of the double-roller magnetic separator 16 is adjusted to perform magnetic separation. The iron-containing material discharged after the magnetic separation is conveyed to the stockyard, the tailings after the magnetic separation of the first double-roller magnetic separator are conveyed to the special shaper 19 for the steel slag through the de-shaping conveyor belt 17, the steel slag after the shaping is conveyed to the second double-roller magnetic separator 21 through the re-magnetic separation conveyor belt 20, and the rotation speed of the magnetic separator is adjusted to perform sufficient magnetic separation. The iron-containing material after the magnetic separation is conveyed to the stockyard through the slag iron conveyor belt 22, and the tailings after the magnetic separation are conveyed to the upper stable bin 24 of the high-efficiency probability screen 32 through the screening conveyor belt 23. The stable bin is provided with high and low level indicators, the high level indicator sends a signal when the steel slag reaches the high level, the lower stable bin 24 is provided with a vibrating double-channel distributor 25 to start the linkage operation and convey the material to the screen box 26 of the high-efficiency probability screen 32 to perform screening, and vice versa. The material reaches the low level, the level indicator sends a signal to stop the feeding linkage operation. The feeding amount of the double-channel distributor 25 is adjusted according to the screening condition of the high-efficiency probability screen 32 to work in the best state. The high-efficiency probability screen 32 can adjust the frequency according to the material screening quality to fully screen the material. The high-efficiency probability screen 32 is provided with the first dust collector 27 to realize the anti-clogging function of the screen mesh, collect the dust into the first dust collector 27, and discharge the dust into the corresponding powder tank 33 through the screw conveyor 35.

[0067] The high-efficiency probability screen 32 in the embodiment is provided with four layers of screen meshes, four kinds of medium and fine aggregate products 30 and one kind of powdery material with a particle size smaller than 0.3 mm are screened below the screen meshes, the four kinds of medium and fine aggregate products 30 are conveyed to the stockyard through the aggregate product conveyor belt 29, and the powdery material with a particle size smaller than 0.3 mm is conveyed to the elevator 38 through the feeding screw conveyor 28, and then is stored in the corresponding powder tank 33. Two powder tanks 33 are arranged in the embodiment, the powder tank 33 is provided with a loading dust remover 37, and the powder tank 33 is loaded into the truck through the loading screw conveyor 34 at any time and is transported out.

[0068] The conical crusher 9 and the special steel slag shaping machine 19 are used in this embodiment.

[0069] 1) The steel slag special conical crusher 9 is a high-performance conical crusher 9 customized according to the physical properties of steel slag and the required particle shape, provided with crushing overload protection, shielding iron block and discharging in one, and equipped with a material hopper 8 at the upper part for controlling the size of the feeding amount, achieving uniform feeding, uniform particle size, good particle shape, and meeting the requirements of preliminary processing of material particle shape and size.

[0070] 2) The steel slag special shaping machine 19 adopts a deep-cavity impeller, optimizes the motion parameters, uses high-efficiency flow channels, improves the passing rate, and combines a high-performance wear-resistant throwing head, adopts "stone hitting stone", and replaces "stone hitting iron", combines the physical properties of steel slag for shaping processing, and has strong sealing performance, no dust overflow, environmental protection, product particle shape is cubic and uniform, reasonable grade, meets the quality requirements of asphalt road aggregate, needle flake content is extremely low, suitable for steel slag aggregate product production, is a special steel slag shaping equipment.

[0071] The high-efficiency probability screen 32 of the double-channel material in the embodiment comprises a screen base, a screen box 26, a material stabilizing bin 24, a double-channel material mechanism and a vibrating mechanism. The screen box 26 is flexibly connected to the screen base. A gate valve is installed at the bottom opening of the material stabilizing bin 24. The vibrating mechanism is used to drive the screen box 26 to vibrate. One end of the screen box 26 is a feeding end, and the other end is a discharging end. Inside the screen box 26, at least two layers of screen meshes are sequentially arranged from top to bottom. At least two discharging chutes are arranged at the discharging end, and each discharging chute corresponds to a screen mesh. The double-channel material mechanism comprises a double-channel material distributor 25, a power unit and a double-channel material partition. The double-channel material distributor 25 is arranged between the gate valve and the feeding end of the screen box 26. The power unit is used to drive the double-channel material distributor 25 to vibrate. A vertical partition is arranged inside the double-channel material distributor 25, which separates the inside of the double-channel material distributor 25 into two vertical material guiding grooves. The double-channel material partition is arranged above the topmost layer of screen meshes in the screen box 26. The vibrating mechanism comprises a vibrator and a vibrating motor. The vibrator is connected to the output shaft of the vibrating motor through a universal joint. The vibrating motor is fixed on the screen base and is used to drive the vibrator to vibrate. The vibrating motor in the embodiment is a variable frequency motor, which provides power for the vibrator. The vibrator vibrates at a small amplitude and a high frequency, so that the screen meshes vibrate at a small amplitude and a high frequency, ensuring that the material is quickly screened from each layer of screen meshes. Each set of vibrator comprises two groups of exciting vibrators. Two sets of four groups of exciting vibrators are matched. The equal mass eccentric blocks are reversely and synchronously rotated to realize vibration. The component of centrifugal force along the vibration direction is always superimposed, and the component along the opposite direction is always counteracted, so that a single vibration direction exciting force is formed, thereby driving the high-efficiency probability screen 32 to move linearly and reciprocally. The probability screen 32 utilizes the self-synchronization principle of probability theory and non-forced connection to complete the entire screening process of the material. The small amplitude is 0.5-5 m / m, the high frequency is 600-3000 times / min, and the variable frequency control of the special variable frequency motor is adopted. According to the amount of material, the size change of particles, the amount of powder content and the dryness of material, the frequency is appropriately adjusted to achieve the purpose of optimal control of product quality.

[0072] The feeding end of the screening box 26 is higher than the discharging end, and four layers of screening meshes are arranged in the screening box 26 in a slanting manner from top to bottom. The discharging end of each layer of screening mesh is provided with a corresponding discharging chute, and the material can be screened into four kinds of aggregate products 30 with different particle sizes and discharged from the corresponding discharging chute during the working process. The gate valve is an electric control gate valve. The working process is briefly introduced as follows: firstly, the conveyor sends the material with water content controlled below 3% to the material stabilizing bin 24, when the material in the material stabilizing bin 24 reaches a higher position, the electric control gate valve is opened, the material is divided into two streams by the double-layer material distributor 25 and the double-layer material distribution partition plate, and then falls onto the top layer of screening mesh in the screening box 26; then the vibration mechanism drives the screening box 26 to perform linear vibration with small amplitude and high frequency, the medium and fine particle size materials are rapidly scattered on the surface of the four layers of screening meshes, and move towards the discharging end, and the materials with different particle sizes are discharged from the corresponding discharging chutes of the four layers of screening meshes, so that the screening of the material is quickly completed. The time required for the high-efficiency probability screen 32 of the embodiment to screen the material is about 1 / 3 of that of the ordinary probability screen 32, and the processing capacity per unit area is about 5 times larger than that of the ordinary probability screen 32.

[0073] The high efficiency probability screen 32 in the embodiment, the air inlet is arranged at the bottom of the screen box 26, the air duct of the first dust collector 27 is connected with the dust suction port, the air inlet pipe is arranged inside the screen box 26, and the air inlet pipe is communicated with the air inlet. The air inlet is mounted on the bottom of the screen box 26 through a flange, and an adjusting butterfly valve for adjusting the air inlet amount is further mounted at the air inlet; by arranging the adjusting butterfly valve, the air amount at the air inlet can be adjusted according to the requirement, and the air flow effect of the screen box 26 is ensured. The whole system from the stable bin 24 to the discharge port through the probability screen 32 can achieve the purpose of air locking, the low material level of the stable bin 24 is not empty, the discharge end of the probability screen 32 is provided with an air locking valve for air locking, and the requirement of powder suction operation is fully achieved. In order to prevent the fine material and the powder from blocking the screen, the air inlet pipe is arranged at the lower middle two sides of the four layers of screens of the high efficiency probability screen 32, and the air inlet amount can be adjusted, the purpose of positive suction and reverse blowing is achieved, the fine material and the powder are prevented from blocking the screen, the screen is designed with diamond-shaped holes, the anti-blocking effect is better, the effect is better, and the aggregate product does not contain powder. The air locking valve in the embodiment is a double-layer electric air locking flap valve, which is prior art, and the structure thereof will not be described in detail. The air locking valve can prevent the screen box 26 from leaking air and short circuiting. A dust cover is further arranged at the top of the screen box 26. In this way, the high efficiency probability screen 32 does not fly dust during the working process. The screen box 26 forms a closed structure. Since the screen box 26 is a surrounding closed structure, the air in the screen box 26 is sucked away after the first dust collector 27 is opened, a negative pressure is formed in the screen box 26, the air at the bottom of the screen box 26 enters the screen box 26 through the air inlet and the air inlet pipe, and the air flow mode of positive suction and reverse blowing is formed in the screen box 26. According to the relationship between the wind speed, the air amount, the size and the size of the separated particles, the air amount and the wind speed can be adjusted, the fine and micro fine particles are positively sucked and reversely blown away from the screen holes by using the positive suction and reverse blowing anti-blocking mechanism and the characteristics of the diamond-shaped screen in the screening process, the micro powder is stirred by the airflow and is synchronously sucked away to be suspended in the screen box 26, and thus the micro powder is sucked into the first dust collector 27 together. In this way, the technical problem of fine and micro fine particles blocking the screen is effectively solved.

[0074] The included angle between the screen and the horizontal plane is 23°-60°. The movement speed of the material on the large inclination screen surface is 3-4 times of the movement speed 0.15-0.3 m / s on the ordinary screen surface in the prior art. Since the speed is obviously increased, the material layer on the screen surface is thinned, and the double-way distributor 25 is arranged to double-stream the material into the screen and the diamond-shaped screen is arranged to screen, so that the material is more fully permeated and prevented from being blocked, and the screening effect is better. The screen hole of the screen is a diamond-shaped screen hole, and the short axis length of the diamond-shaped screen hole is 1.1-1.2 times of the particle size of the required screening material. The screen is made of high-strength and wear-resistant material, has rigidity and elasticity, and does not rust. The ordinary square screen hole in the prior art is changed into a diamond-shaped screen hole, the condition of fine material blocking the screen is greatly reduced, the short axis of the screen hole is about 1.2 times of the particle size of the required material, so that the material can quickly pass through the screen surface, and the blocking is reduced.

[0075] The probability screen 32 in the embodiment is provided with a double-channel material distributor 25, so that the material falling from the material stabilizing bin 24 can be evenly spread into the surface of the first layer of screen meshes in two parts, and then the vibration motor is started to drive the vibration of each layer of screen meshes in the screen box 26, so as to complete the separation of materials of different particle sizes. The double-channel material distribution mechanism is arranged to make the material layer of the material entering the screen be divided and thinned, so that the time for rapid screening of medium and fine particle materials is shortened, and the technical effects of screening the material particles in sufficient time and more accurate particle size selection are achieved. The high-efficiency probability screen 32 with double-channel material distribution can achieve adjustable and controllable product quality of screening, good screening effect of medium and fine aggregate products, reasonable grade matching, no powder in medium and fine aggregate products, the whole set of equipment is specially designed and customized for steel slag asphalt road aggregate medium and fine aggregate processing, convenient maintenance, short maintenance time, high-efficiency energy saving of the equipment, so that the steel slag aggregate products of each grade after screening are free of powder, high-quality steel slag aggregate products are achieved, the working environment is free of dust, low noise, and the requirements of high-efficiency energy saving and environmental protection are achieved.

[0076] The steel slag high-quality aggregate processing production line in the embodiment is used for processing of steel slag, can obtain green and environmentally-friendly steel slag high-quality medium and fine aggregate processing, the equipment is reasonably matched, the magnetic separation of iron is sufficient, the residual amount is low, the crushing and shaping process is controllable, the powder removal effect is good, the equipment control is centralized in the control operation room, the process flow and equipment operation are displayed on the screen, orderly and reasonable, and can be linked and controlled or controlled individually, the degree of automation is high, the operation is free of dust, the products are classified and stored in the finished product warehouse, the loading and unloading are convenient, the energy consumption is low, the operation is reliable, and the high-quality aggregate product processing production line meeting the requirements of green environmental protection is achieved.

[0077] The above embodiment is a preferred embodiment of the present application, but the embodiments of the present application are not limited to the above embodiment, and any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the present application should be an equivalent replacement mode, and all are included in the protection scope of the present application.

Claims

1. A production line for processing high-quality steel slag aggregate, characterized in that, The process includes, in sequence, a silo, a vibrating feeder, a feeding conveyor belt, a hanging magnet, an electromagnetic drum, a feeding conveyor belt, a first vibrating screen, a demagnetizing conveyor belt, a first double-roller magnetic separator, a screening conveyor belt, a probability screen, an aggregate conveyor belt, and a feeding screw conveyor. After steel slag enters the silo, it is fed to the feeding conveyor belt by the vibrating feeder. The hanging magnet, suspended on the top side of the feeding conveyor belt, attracts iron-containing particles from the steel slag to the surface. The steel slag passing through the hanging magnet then undergoes magnetic separation of iron-containing materials by the electromagnetic drum, and is then conveyed to the first vibrating screen by the feeding conveyor belt for screening. The screened steel slag then enters the first double-roller magnetic separator by the demagnetizing conveyor belt for magnetic separation. After magnetic separation, the steel slag then enters the probability screen by the screening conveyor belt for screening. Steel slag aggregates of different particle sizes are then conveyed to the stockpile by their respective aggregate conveyor belts. The screened powdery material is then conveyed to a storage container by the feeding screw conveyor. A crusher, a discharge conveyor belt, and a second vibrating screen are sequentially arranged between the first vibrating screen and the demagnetizing conveyor belt. Steel slag with a diameter less than or equal to a predetermined size after screening by the first vibrating screen enters the demagnetizing conveyor belt through the under-screen conveyor belt. Steel slag with a diameter greater than the predetermined size after screening by the first vibrating screen enters the crusher for crushing. The crushed steel slag enters the second vibrating screen through the discharge conveyor belt for further screening. Steel slag with a diameter less than or equal to the predetermined size after further screening is conveyed to the first double-roll magnetic separator for magnetic separation through the demagnetizing conveyor belt. A de-shaping conveyor belt and a shaping machine are sequentially arranged between the first double-roll magnetic separator and the screening conveyor belt. The steel slag that has completed magnetic separation from the first double-roll magnetic separator is transported to the shaping machine via the de-shaping conveyor belt. The steel slag that has completed shaping from the shaping machine is then sent to the probability screen via the screening conveyor belt for screening. The probability screen includes a screen base, a screen box, a material stabilizing bin, a double-channel material distribution mechanism, and a vibration mechanism. The screen box is flexibly connected to the screen base. A gate valve is installed at the bottom opening of the material stabilizing bin. The vibration mechanism is used to drive the screen box to vibrate. One end of the screen box is the feed end, and the other end is the discharge end. At least two layers of screens are arranged sequentially from top to bottom inside the screen box. At least two discharge chutes are provided at the discharge end, and each discharge chute corresponds to a screen. The double-channel material distribution mechanism includes a double-channel material distributor, a power unit, and a double-channel material distribution partition. The double-channel material distributor is located between the gate valve and the feed end of the screen box. The power unit is used to drive the double-channel material distributor to vibrate. A vertical partition is provided inside the double-channel material distributor, which divides the interior of the double-channel material distributor into two vertical guide channels. The double-channel material distribution partition is located above the top layer of screens inside the screen box. The material stagnation silo is equipped with a high-level material level gauge and a low-level material level gauge. When the steel slag reaches the high level, the high-level material level gauge sends a signal, and the dual-channel material distributor located below the material stagnation silo starts working in conjunction with the material to transport the material to the screen box for screening. Conversely, when the material reaches the low level, the low-level material level gauge sends a signal to stop the feeding operation.

2. The steel slag high-quality aggregate processing production line according to claim 1, characterized in that, A return conveyor belt is also provided between the second vibrating screen and the crusher. Steel slag with a diameter larger than the predetermined size after being screened again by the second vibrating screen is transported to the crusher for further crushing via the return conveyor belt.

3. The steel slag high-quality aggregate processing production line according to claim 2, characterized in that, A re-magnetic separation conveyor belt and a second double-roll magnetic separator are also provided between the shaping machine and the screening conveyor belt. The steel slag that has been shaped from the shaping machine enters the second double-roll magnetic separator through the re-magnetic separation conveyor belt for re-magnetic separation, and then enters the probability screen through the screening conveyor belt.

4. The steel slag high-quality aggregate processing production line according to claim 3, characterized in that, It also includes a first dust collector and a screw conveyor, the first dust collector being used to extract dust from the probability sieve, and the screw conveyor being used to transport the extracted dust to the storage container.

5. The steel slag high-quality aggregate processing production line according to claim 4, characterized in that, It also includes an elevator and a loading screw conveyor. The feeding screw conveyor sends the dust screened in the probability screen to the elevator, the elevator sends the dust to the storage container, and the loading screw conveyor is used to load the powdery material in the storage container onto a truck for transportation.

6. The steel slag high-quality aggregate processing production line according to claim 5, characterized in that, It also includes a closed box and a second dust collector. The first vibrating screen, the under-screen conveyor belt, the crusher, the discharge conveyor belt, the return conveyor belt and the second vibrating screen are all located inside the closed box. The second dust collector is installed on the closed box and is used to suck out the dust in the closed box.

7. The steel slag high-quality aggregate processing production line according to claim 6, characterized in that, Each of the discharge chutes is equipped with an airlock valve, the top of the screen box is equipped with a dust suction port, the bottom of the screen box is equipped with an air inlet, and the air duct of the first dust collector is connected to the dust suction port; the screen mesh has diamond-shaped screen holes, and the short axis length of the diamond-shaped screen holes is 1.1-1.2 times the particle size of the material to be screened.

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