CA3069632C - Iron fine removal and sorting system for magnetic hard rocks - Google Patents

Iron fine removal and sorting system for magnetic hard rocks Download PDF

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Publication number
CA3069632C
CA3069632C CA3069632A CA3069632A CA3069632C CA 3069632 C CA3069632 C CA 3069632C CA 3069632 A CA3069632 A CA 3069632A CA 3069632 A CA3069632 A CA 3069632A CA 3069632 C CA3069632 C CA 3069632C
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sorting
hard rock
hard
materials
iron
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CA3069632A1 (en
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Chengchen ZHANG
Hengsheng LI
Wei Zhao
Ye CAO
Bo Liu
Junhai LIN
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Longi Magnet Co Ltd
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Longi Magnet Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B15/00Combinations of apparatus for separating solids from solids by dry methods applicable to bulk material, e.g. loose articles fit to be handled like bulk material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00Disintegrating plant with or without drying of the material

Abstract

An iron fine removal and sorting system for magnetic hard rocks, where hard rocks are hard magnetic ores containing higher iron grade that cannot be ground in a grinding process of a semi-autogenous mill and can only be discharged periodically from tailings, that satisfies an environment-friendly zero-emission standard is disclosed. The iron fine removal and sorting system, which includes a feeding system, a hard rock screening system, a hard rock unbroken ball sorting system, hard rock rough and fine sorting systems, and a hard rock automatic return system, is configured to grade materials from a semi-autogenous grinding system according to particle size, separate hard rocks from unbroken and broken steel balls and tramp iron, return separated hard rocks to a crushing system, return separated unbroken steel balls to the semi-autogenous grinding system, and serve separated broken steel balls and tramp iron as raw materials for reprocessing steel balls.

Description

IRON FINE REMOVAL AND SORTING SYSTEM FOR MAGNETIC HARD ROCKS
FIELD OF THE INVENTION
[0001] The present application belongs to the technical field of magnetic separation, and in particular to an iron fine removal and sorting system for magnetic hard rocks, which is specially designed for the special problem of iron removal in magnetic hard rock materials, to completely solve the separation problem of the mixed magnetic hard rock materials and iron.
BACKGROUND
[0002] With the surplus of the iron ore market and the trend of iron ore that has been sluggish recently or even a long time, for major dressing plants, an urgent problem to be solved is to improve the ore dressing technology and reduce the production cost of iron powder.
[0003] At present, the production cost of the iron powder can be reduced by mining high-grade raw ore or improving the ore dressing technology. Because most of domestic mines are generally lean and fewer of the domestic mines are rich, for most domestic dressing plants, the approach of mining high-grade raw ore is almost impossible to achieve, the production cost of the iron powder can be reduced only by improving the ore dressing technology. And the ore dressing technology can be improved by means of "more crushing and less grinding" or "less grinding and more sorting", thereby reducing the production cost.
[0004] The traditional grinding process has been tested for many years of production practice, and shows the disadvantages of a long technology process, more device models and quantities used, a large amount of metal consumption, high capital investment and production cost and the like. Research and development of a semi-autogenous grinding circuit and a semi-autogenous mill provide a very superior magnetic sorting idea. Because of simple process (two segments including crusher and screening device are omitted), convenient configuration and low investment of the semi-autogenous grinding circuit, and many researchers invest a lot of energy and money into the practical research of the semi-autogenous mill. With the improvement of the semi-autogenous grinding technology for the ore dressing technology, the iron balls mixed in a grinding device are discharged along .
14306767.3 with the tailings together for subsequent processing. The better the quality of the ore is, the stronger the magnetism, so that it is difficult separate the ores from the iron balls by using the original magnetic sorting technology, and then part of the dressing plants cannot use the semi-autogenous grinding technology.
[0005] In the mining and sorting of the iron ores, the special problem of iron removal in magnetic hard rock materials has always been a major problem troubling enterprises. An unavoidable problem for many technical researchers is how to completely solve the separation problem of the mixed magnetic hard rock materials and iron, which has not been effectively solved in actual production. The separation technology associated with the special technology .. generally has problems of high magnetic field strength, which is difficult to ensure high grade and high recovery rate of concentrate at the same time; or the level of equipment automation is very low, and a lot of manpower is required to maintain regulation, thus increasing the production cost or other problems.
SUMMARY
[0006] In order to solve the above problems, an iron fine removal and sorting system for magnetic hard rocks is proposed by the inventors through design and research, which has the advantages of perfect concentrate grade, large processing capacity and high degree of automation while ensuring the high recovery rate.
[0007] According to the technical solution of the present application, an iron fine removal and sorting system for magnetic hard rocks is provided, which completes the sorting and separation of iron and hard rocks in the whole sorting system, and returns the sorted product back to the production system. The iron fine removal and sorting system for magnetic hard rocks mainly includes a feeding system, a hard rock screening system, a hard rock unbroken .. ball sorting system, a hard rock rough sorting system, a hard rock fine sorting system and a hard rock automatic return system.
[0008] The iron fine removal and sorting system for magnetic hard rocks can grade all the hard rock tailings produced by the system and grade iron ores, to meet an operation of the whole production line, and realize a hard rock sorting of the whole production line and reach a zero-emission standard.

14306767.3 [00091 The feeding system can buffer, store and transport evenly on-site hard rock materials to the hard rock screening system in the next process. The hard rock screening system can grade hard rocks according to particle sizes, in order to remove iron and sort materials containing unbroken balls and broken balls. The whole hard rock sorting system can separate the large hard rocks from the unbroken balls over a screen to realize a first step sorting. The hard rock rough sorting system can separate a small hard rock from the broken balls under the screen to realize a second step sorting. The hard rock fine sorting system performs a third step sorting to a part of the hard rocks taken out from the separated hard rocks due to the small particle size of the screen underflows and the incomplete separation of the hard rock rough sorting system. And the hard rock automatic return system can return all the sorted materials sorted by the sorting system back to the production system.
[0010] Furthermore, the feeding system includes a receiving hopper 3-1, a large inclination-angle belt 3-2, an intermediate material bin 3-3 and a vibratory feeding 3-4. The receiving hopper 3-1 uses a conical hopper structure, and after the hard rock materials are collected by the receiving hopper 3-1, the materials are continuously supplied into the large inclination-angle belt 3-2 through the intermediate material bin 3-3. The large inclination-angle belt 3-2 uses a structure having a large inclination-angle of 45 degrees and can lift the supplied hard rocks to feed to the whole system. The belt material lifting structure in the feeding system uses a bucket-type scraper structure to ensure that the materials will not .. slide during the rising process. The hard rock materials will stay 4 to 6 hours in the intermediate material bin to ensure that the subsequent device can be continuously and fully fed and meet the needs of the equipment handling capacity. An electric opening gate is adopted at a bottom of the intermediate material bin to control a feeding amount of the materials. The vibratory feeding 3-4 uses a heavy-duty vibratory feeder, which can withstand pressure of part of the materials, and the materials are fed quantificationally into the next hard rock screening system.
[0011] Preferably, the hard rock screening system includes a material inlet 4-1, a distributor 4-2, a screen 4-3, a vibrating motor 4-4, a screen overflow outlet 4-5, a screen underflow outlet 4-6, a base 4-7 and a vibrating spring 4-8. The material inlet 4-1 is configured to receive the hard rock materials fed from the material bin, and the distributor 4-2 is configured to perform a preliminary dispersion processing to the fed hard rock materials.
The materials 14306767.3 dispersed through the distributor 4-2 enter the screen 4-3, and the materials are fully spread out under the vibration of the vibrating motor 4-4. The screen overflows enter into the screen overflow outlet 4-5, and the screen underflows enter into the screen underflow outlet 4-6. A
lower portion of a vibrating screen is supported by the base 4-7, and the vibrating spring 4-8 is configured to damp a vibrating portion to prevent the base 4-7 from being damaged by fatigue and ensure the stability of the ground foundation.
[0012] Preferably, the hard rock unbroken ball sorting system includes an unbroken ball detector 5-1, a guide plate 5-2, an actuating mechanism 5-3, a pneumatic push rod 5-4, an adjusting device 5-5, a material distribution mechanism 5-6, a ball output hopper 5-7 and a .. hard rock output hopper 5-8. The hard rock materials with large particle size fed from the screening system pass through the unbroken ball detector 5-1, when the unbroken ball detector 5-1 detects a steel ball in the hard rocks, the actuating mechanism 5-3 will receive a signal of incoming iron and immediately drive the pneumatic push rod 5-4 to change a track of the steel ball and sort the steel ball into the ball output hopper 5-7, and the hard rocks which are not detected directly enter into the hard rock output hopper 5-8.
The adjusting device 5-5 is adopted to adjust an angle of the incoming materials to ensure an accuracy of the material distribution, and the material distribution mechanism 5-6 is configured to adjust an angle of the discharge materials to ensure the coordination of the whole sorting system.
[0013] Preferably, the hard rock rough sorting system includes a vibrating feeder 6-1, a transmission belt 6-2, a rough sorting detector 6-3, a transmission drum 6-4, a gear motor 6-5, a rough sorting pneumatic push rod 6-6, a rough sorting actuating mechanism 6-7, a material distribution board 6-8, a hard rock outlet 6-9 and a broken ball outlet 6-10.
When the screen underflows enter into the hard rock rough sorting system, the materials are evenly distributed on the transmission belt 6-2 by the vibrating feeder 6-1 and transmitted to a detection position of the rough sorting detector 6-3. And when the rough sorting detector 6-3 detects a signal of the iron, the signal is transmitted to the rough sorting pneumatic push rod 6-6, and the rough sorting actuating mechanism 6-7 is pushed, the hard rocks are separated from the tramp iron at the position of the material distribution board 6-8, and the materials are introduced into the next sorting system through the hard rock outlet 6-9 and the broken ball outlet 6-10.
[0014] More preferably, the hard rock fine sorting system includes a channel type vibrating feeder 7-1, a fine sorting detector 7-2, a fine sorting pneumatic push rod 7-3, a fine sorting 14306767.3 actuating mechanism 7-4, a material distribution board 7-5, a hard rock outlet 7-6 and a broken ball outlet 7-7. After the rough sorting broken balls enter the fine sorting system, the rough sorting broken balls are transmitted to the detection position of the fine sorting detector 7-2 by the channel type vibrating feeder 7-1, and when the fine sorting detector 7-2 detects a signal of the iron, the signal is transmitted to the fine sorting pneumatic push rod 7-4, and the fine sorting actuating mechanism 7-7 is pushed, the hard rocks are separated from the tramp iron at the position of the material distribution board 7-5, and the materials are introduced into the next sorting system through the hard rock outlet 7-6 and the broken ball outlet 7-7.
[0015] Further, the hard rock automatic return system can return all the sorted materials sorted by the sorting system back to the production system, to achieve an object of sorting in whole. The automatic hard rock return system includes a hard rock return conveyor 8-1, a hard rock return guide trough 8-2, an unbroken ball material bin 8-3 and a broken ball material bin 8-4. The hard rock materials after sorting are returned into a hard rock conveyor line by the hard rock return conveyor 8-1 through the hard rock return guide trough 8-2. And unbroken ball materials enter into a semi-autogenous mill through the unbroken ball material bin 8-3, and the broken ball materials enter into the broken ball material bin 8-4, so that the return of the whole material sorting line is completed.
[0016] Compared with the conventional technology, the iron fine removal and sorting system for magnetic hard rocks disclosed by the present application has a unique structure, can automatically complete the sorting of the whole system, and can completely treat the tailings of the whole magnetic sorting line, realizing the zero emission of the tailings and reusing of the tailings, and saving a lot of production cost. More specifically, the present application has the following advantages.
[0017] First, the iron fine removal and sorting system for magnetic hard rocks has a high automation degree, a compact structure, a small footprint and is convenient to install.
[0018] Second, the iron fine removal and sorting system for magnetic hard rocks can grade the hard rocks according to the particle size, in order to perform unbroken ball iron removal and sorting to materials containing unbroken balls and broken balls.
[0019] Third, the hard rock rough sorting system in the iron fine removal and sorting system for magnetic hard rocks can sort all metals containing iron.

14306767.3 [0020] Fourth, the hard rock fine sorting system in the iron fine removal and sorting system for magnetic hard rocks can accurately separate the sorted metal iron from the hard rocks.
[0021] Fifth, the whole iron fine removal and sorting system for magnetic hard rocks uses the energy saving technology with low-energy-consumption.
.. [0022] Sixth, a PLC-controlled pneumatic push rod is used in the separation technology of the iron fine removal and sorting system for magnetic hard rocks, the precision of the actuating mechanism is high, so that the precision of the iron separation is high.
[0023] Seventh, the whole iron fine removal and sorting system for magnetic hard rocks can continuously meet the continuous operation of a discharging system of produced tailings, realize the return of all the hard rocks and the iron to the production system after the sorting, and achieve the environment-friendly zero-emission standard. The present application has simple structure and reasonable design, which fills the blank of the magnetic gravity concentration equipment, and is worthy of wide popularization and application.
BRIEF DESCRIPTION OF THE DRAWING
[0024] Figure 1 is a schematic view of an iron fine removal and sorting system for magnetic hard rocks according to the present application;
[0025] Figure 2 is a top view of the iron fine removal and sorting system for magnetic hard rocks shown in Figure 1;
[0026] Figure 3 is a schematic structural view of a feeding system;
[0027] Figure 4 is a schematic structural view of a hard rock screening system;
[0028] Figure 5 is a schematic structural view of a hard rock unbroken ball sorting system;
[0029] Figure 6 is a schematic structural view of a hard rock rough sorting system;
[0030] Figure 7 is a schematic structural view of a hard rock fine sorting system; and [0031] Figure 8 is a schematic structural view of a hard rock automatic return system.
DETAIL DESCRIPTION OF EMBODIMENTS
[0032] Technical solutions of embodiments of the present application will be clearly and 14306767.3 completely described hereinafter in conjunction with the drawings of the embodiments according to the present application. Apparently, the embodiments described are only part embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all of other embodiments, made by the person skilled in the art without any creative efforts, are also deemed to fall into the scope of protection of the present application. In addition, the protective scope of the present application should not be merely limited in the following specific structures or specific parameters.
[0033] The "hard rock" indicated by the iron fine removal and sorting system for magnetic hard rocks according to the present application refers to: in grinding process of the semi-autogenous mill, some relatively hard magnetic ores cannot to be ground, and can only be discharged periodically from tailings, and these magnetic ores are referred as hard rocks.
[0034] Compared with the previous sorting equipment, the iron fine removal and sorting system for magnetic hard rocks has abandoned the way that the previous sorting equipment only considers the magnetic separation, to overcome the problem that, for the magnetic hard rock containing higher iron grade, the conventional technology fails to separate the hard rocks from the iron completely and have a higher energy consumption by means of magnetic force.
In the present application, a method of particle size grading, a multi-point matrix detection and a pneumatic actuating mechanism is adopted to completely separate the hard rock from the iron, the main characteristics are that the iron is completely separated, the energy consumption is low, the tailings can be completely reused and zero emissions can be achieved.
[0035] In order to achieve the above object, the technical solution of the present application is: the iron fine removal and sorting system for magnetic hard rocks mainly includes a feeding system, a hard rock screening system, a hard rock unbroken ball sorting system, a hard rock rough sorting system, a hard rock fine sorting system and a hard rock automatic return system.
The present sorting system can directly process the on-site hard rocks from the semi-autogenous grinding system, the screening system can grade the materials according to the particle size, and then separate the hard rocks from steel balls, broken balls, tramp iron and the like according to different particle sizes of the materials, and the whole separation process can be fully automated, and the separated hard rock can be returned automatically to a crushing system, the separated unbroken ball can be returned automatically to the semi-autogenous grinding system for reusing, the separated broken balls and tramp iron can 14306767.3 replace scrap steel as raw materials for reprocessed steel balls, and the whole system is centralized controlled by a centralized control room.
[0036] Specifically, the iron fine removal and sorting system for magnetic hard rocks according to the present application can sort out all steel balls mixed in the magnetic hard rocks. The iron fine removal and sorting system for magnetic hard rocks needs to be installed at an outlet position of a semi -autogenous grinding device, the discharged hard rocks will directly enter the iron removal and sorting system, and the hard rocks after sorting can directly enter into a cone crusher, and the waste balls are discharged simultaneously from sorted steel balls, and the unbroken balls can be directly back to the semi-autogenous mill for reusing. The whole hard rock tailings are fully utilized to achieve zero tailings discharge of the whole magnetic separation system.
[0037] As shown in Figures 1 to 8, the structure of the iron fine removal and sorting system for magnetic hard rocks according to the present application includes a feeding system, a hard rock screening system, a hard rock unbroken ball sorting system, a hard rock rough sorting system, a hard rock fine sorting system and a hard rock automatic return system.
[0038] The structure of the iron fine removal and sorting system for the magnetic hard rocks is shown in Figures 1 to 2, which includes a feeding system 1-1, a hard rock screening system 1-2, a hard rock unbroken ball sorting system 1-3, a hard rock rough sorting system 1-4, a hard rock fine sorting system 1-5 and a hard rock automatic return system 1-6.
The feeding system 1-1 is located at a front end of the system and used for feeding hard rock materials to the hard rock screening system 1-2, the feeding system 1-1 extends from the bottom to the top, a material outlet of the feeding system 1-1 is above the hard rock screening system 1-2, and the hard rock screening system 1-2 is located in front of the hard rock unbroken ball sorting system 1-3. The screen overflows of the hard rock screening system 1-2 are directly fed into the whole hard rock sorting system 1-3. The hard rock rough sorting system 1-4 is located just below the hard rock screening system 1-2, and the hard rock fine sorting system 1-5 is located just below the hard rock rough sorting system 1-4. And the upper portion of the hard rock fine sorting system 1-5 and lower connecting portion of the hard rock rough sorting system 1-4 are connected by a hopper to ensure continuity of sorting. The on-site materials are centralizedly and evenly fed into the hard rock screening system 1-2 by the feeding system 1-1 to perform particle size grading, and the graded materials with large particle sizes are sorted by the hard 14306767.3 rock unbroken ball sorting system 1-3 to sort out the unbroken ball product, the screen underflows are entered into the hard rock rough sorting system 1-4 and the hard rock fine sorting system 1-5 to be sorted, and finally, the hard rock automatic return system 1-6 completes the separation and sorting between the iron and hard rocks in the whole system.
The whole sorting process is controlled by the automatic system to achieve zero discharge standards.
[0039] The feeding system, as shown in Figure 3, is able to buffer and store the on-site hard rocks, and the hard rocks are uniformly transmitted to the hard rock screening system in the next process. The feeding system includes a receiving hopper 3-1, a large inclination-angle belt 3-2, an intermediate material bin 3-3, a vibratory feeding 3-4 and the like. The receiving hopper 3-1 is located at the forefront of the whole system, the intermediate material bin 3-3 is connected to the rear of the receiving hopper 3-1, the vibratory feeding 3-4 is located right below the intermediate material bin 3-3, and the large inclination-angle belt 3-2 is located at the front outlet of the vibratory feeding 3-4. The working process of the feeding system is as .. follows: the receiving hopper 3-1 adopts a conical hopper structure, and after the hard rock materials are collected by the receiving hopper 3-1, the materials are continuously supplied into the large inclination-angle belt 3-2 through the intermediate material bin 3-3. The large inclination-angle belt 3-2 uses a structure having a large inclination-angle of 45 degrees and can lift the supplied hard rocks to feed materials to the whole system. The belt material lifting method in the feeding system uses a bucket-type scraper structure to ensure that the materials will not slide during the rising process. The hard rock materials will stay 4 to 6 hours in the intermediate material bin to ensure that the subsequent device can be continuously and fully fed and meet the needs of the equipment handling capacity. An electric opening gate is used at the bottom of the intermediate material bin to control the feeding amount of the materials. A
heavy-duty vibratory feeder is adopted in the vibratory feeding 3-4 and can withstand the pressure of part of the materials, and the materials are fed quantificationally into the next hard rock screening system.
[0040] The hard rock screening system, as shown in Figure 4, is able to grade the hard rocks according to particle sizes, in order to remove iron and sort the materials containing unbroken balls and broken balls. The hard rock screening system includes a material outlet 4-1, a distributor 4-2, a screen 4-3, a vibrating motor 4-4, a screen overflow outlet 4-5, a screen
- 9-14306767.3 underflow outlet 4-6, a base 4-7 and a vibrating spring 4-8 and the like. The material inlet 4-1 is located just above the whole system, the distributor 4-2 is below the material inlet 4-1, the front end of the distributor 4-2 is connected with the screen 4-3, the vibrating motor 4-4 is located right above the screen 4-3, the screen overflow outlet 4-5 is located directly in front of the screen 4-3, the screen underflow outlet 4-6 is located right below the screen 4-3, and the base 4-7 and the vibrating spring 4-8 are located right above the screen 4-3 to support the whole hard rock screening system. The material inlet 4-1 is configured to receive the hard rock materials fed from the material bin, and the distributor 4-2 is configured to perform a preliminary dispersion processing to the fed hard rock materials. The materials dispersed through the distributor 4-2 enter the screen 4-3, and the materials are fully spread out under the vibration of the vibrating motor 4-4. The screen overflows enter into the screen overflow outlet 4-5, and the screen underflows enter into the screen underflow outlet 4-6. The lower portion of a vibrating screen is supported by the base 4-7, and the vibrating spring 4-8 is configured to damp a vibrating portion to prevent the base 4-7 from being damaged by fatigue and ensure the stability of the ground foundation.
[0041] The hard rock unbroken ball sorting system, as shown in Figure 5, is able to separate large hard rocks from unbroken balls over the screen to achieve a first step sorting. The hard rock unbroken ball sorting system includes an unbroken ball detector 5-1, a guide plate 5-2, an actuating mechanism 5-3, a pneumatic push rod 5-4, an adjusting device 5-5, a material distribution mechanism 5-6, a ball output hopper 5-7 and a hard rock output hopper 5-8. The unbroken ball detector 5-1 is located at the forefront of the sorting system, the guide plate 5-2 is parallel to the unbroken ball detector 5-1 and behind the unbroken ball detector 5-1, the actuating mechanism 5-3 is located right below the guide plate 5-2 and at the material throwing position, the pneumatic push rod 5-4 is connected to the back of the actuating mechanism 5-3, the adjusting device 5-5 is right below the actuating mechanism 5-3, the material distribution mechanism 5-6 is right below the material throwing position, and the output ball hopper 5-7 and the output hard rock hopper 5-8 are located respectively below both sides of the material distribution mechanism 5-6. The hard rock materials with large particle sizes fed from the screening system pass through the unbroken ball detector 5-1, when the unbroken ball detector 5-1 detects a steel ball in the hard rocks, the actuating mechanism 5-3 will receive a signal of the incoming iron and immediately drive the pneumatic push rod
- 10-14306767.3 5-4 to change the track of the steel ball and sort the steel ball into the output ball hopper 5-7, and the hard rocks which are not detected directly enter into the output hard rock hopper 5-8.
The adjusting device 5-5 is adopted to adjust an angle of the incoming materials to ensure the accuracy of the material distribution, and the material distribution mechanism 5-6 is adopted to adjust an angle of the discharge materials to ensure the coordination of the whole sorting system.
[0042] The hard rock rough sorting system, as shown in Figure 6, is able to separate small hard rocks and broken balls under the screen to achieve a second step sorting.
The hard rock rough sorting system includes a vibrating feeder 6-1, a transmission belt 6-2, a rough sorting detector 6-3, a transmission drum 6-4, a gear motor 6-5, a rough sorting pneumatic push rod 6-6, a rough sorting actuating mechanism 6-7, a material distribution board 6-8, a hard rock outlet 6-9 and a broken ball outlet 6-10 and the like. The vibrating feeder 6-1 is located at the forefront of the sorting system, the transmission belt 6-2 is behind the vibrating feeder 6-1, the rough sorting detector 6-3 is mounted below the transmission belt 6-2, the transmission drum 6-4 is mounted at two ends of the transmission belt 6-2, and a side surface of the transmission drum 6-4 is provided with a rotating shaft which is connected to and driven by the gear motor 6-5. The rough sorting pneumatic push rod 6-6 and the rough sorting actuator 6-7 are mounted directly in front of the transmission belt 6-2, a lower side of a material falling point is adjusted by the material distribution board 6-8, and the hard rock outlet 6-9 and the broken ball outlet 6-10 are mounted respectively below the two sides of the material distribution board 6-8.
When the screen underflows enter into the hard rock rough sorting system, the materials are evenly distributed on the transmission belt 6-2 by the vibrating feeder 6-1 and transmitted to a detection position of the rough sorting detector 6-3. And when the rough sorting detector 6-3 detects a signal of the iron, the signal is transmitted to the rough sorting pneumatic push rod 6-6, and the rough sorting actuating mechanism 6-7 is pushed, the hard rocks are separated from the tramp iron at the position of the material distribution board 6-8, and the materials are introduced into a next sorting system through the hard rock outlet 6-9 and the broken ball outlet 6-10.
[0043] The hard rock fine sorting system is shown in Figure 7. Since the screen underflows have small particle sizes, generally in the case of a large processing capacity, the separation after the hard rock rough system is not complete, the separated hard rocks will take out a part
- 11-14306767.3 of the hard rocks, and therefore, a hard rock sorting system is designed. The hard rock fine sorting system is used for a third step sorting. The hard rock fine sorting system includes a channel type vibrating feeder 7-1, a fine sorting detector 7-2, a fine sorting pneumatic push rod 7-3, a fine sorting actuating mechanism 7-4, a material distribution board 7-5, a hard rock outlet 7-6 and a broken ball outlet 7-7. The channel type vibrating feeder 7-1 is arranged at the top of the hard rock fine sorting system, the fine sorting detector 7-2 is mounted below the outlet position of the channel type vibrating feeder 7-1, the fine sorting pneumatic push rod 7-3 and the fine sorting pneumatic push rod 7-4 are located below the fine sorting detector, the material distribution board 7-5 is located below the materials throwing point of the vibrating feeder, and the hard rock outlet 7-6 and the broken ball outlet 7-7 are located respectively below two sides of the material distribution board 7-5. After the rough sorting broken balls enter the fine sorting system, the rough sorting broken balls are transmitted to the detection position of the fine sorting detector 7-2 by the channel type vibrating feeder 7-1, and when the fine sorting detector 7-2 detects a signal of the iron, the signal is transmitted to the fine sorting pneumatic push rod 7-4, and the fine sorting actuating mechanism 7-7 is pushed, the hard rocks are separated from the tramp iron at the position of the material distribution board 7-5, and the materials are introduced into the next sorting system through the hard rock outlet 7-6 and the broken ball outlet 7-7.
[0044] The hard rock automatic return system, as shown in Figure 8, is able to return all sorted materials sorted by the sorting system to the production system to achieve an object of sorting in whole. The hard rock automatic return system includes a hard rock return conveyor 8-1, a hard rock return guide trough 8-2, an unbroken ball material bin 8-3 and a broken ball material bin 8-4. The hard rock return conveyor 8-1 is located at the forefront of the hard rock automatic return system, the hard rock return guide trough 8-2 is located below a material falling position of the conveyor, and the unbroken ball material bin 8-3 and the broken ball bin 8-4 are located at two sides of the hard rock return guide trough 8-2, respectively. The hard rock materials after sorting are returned into a hard rock conveyor line by the hard rock return conveyor 8-1 through the hard rock return guide trough 8-2. And the unbroken ball materials enter into the semi-autogenous mill through the unbroken ball material bin 8-3, and the broken ball materials enter into the broken ball material bin 8-4, so that the return of the whole material sorting line is completed.
- 12-14306767.3 [0045] Preferably, in the present application, all components of the iron fine removal and sorting system for magnetic hard rocks are made of corrosion resistant, high temperature resistant and high strength materials, and the whole equipment has a long service life. It is further emphasized that the whole sorting system uses the energy saving technology with low-energy-consumption; a PLC-controlled pneumatic push rod is used in the separation technology of the iron fine removal and sorting system for magnetic hard rocks, the precision of the actuating mechanism is high, and the precision of the iron separation is high; the sorting system can continuously meet the continuous operation of a discharging system of produced tailings, realize the return of all the hard rocks and the iron to the production system after being sorted, and achieve the environment-friendly zero-emission standard. The present system has a high degree of automation, a compact structure, a small footprint and is convenient to install.
[0046] The embodiments described above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Any changes or substitutions that may be easily conceived based on the technical scope of the present application are intended to fall within the protection scope of the present application.
It should be understood by an ordinary person in the art that any variety of modification could be made in format and detail without departing from the spirit and scope of the present application defined by the appended claims.
- 13-14306767.3

Claims (9)

1. An iron fine removal and sorting system for magnetic hard rocks, comprising: a feeding system, a hard rock screening system, a hard rock unbroken ball sorting system, a hard rock rough sorting system, a hard rock fine sorting system and a hard rock automatic return system, wherein a hard rock is a hard magnetic ore containing a higher iron grade that cannot be ground in a grinding process of a semi-autogenous mill and can only be discharged periodically from tailings; and the iron fine removal and sorting system for magnetic hard rocks is configured to: grade materials from a semi-autogenous grinding system according to a particle size;
separate hard rocks from unbroken steel balls, broken steel balls, tramp iron in the materials; return separated hard rocks to a crushing system; return separated unbroken steel balls to the semi-autogenous grinding system for reusing; and serve separated broken steel balls and tramp iron as raw materials for reprocessing steel balls.
2. The iron fine removal and sorting system for magnetic hard rocks according to claim 1, wherein, the iron fine removal and sorting system for magnetic hard rocks is configured to grade all produced hard rock tailings and grade iron ores, to meet an operation of a whole production line, realize a hard rock sorting of the whole production line and reach a zero emission standard after sorting.
3. The iron fine removal and sorting system for magnetic hard rocks according to claim 1, wherein, the feeding system is configured to buffer, store and transport evenly on-site hard rock materials to the hard rock screening system in the next process;
the hard rock screening system is configured to grade the hard rocks according to particle sizes, in order to remove iron and sort materials containing unbroken balls and broken balls;

16999486.1 Date Regue/Date Received 2021-05-28 the hard rock unbroken ball sorting system is configured to separate first hard rocks from the unbroken balls over a screen to realize a first step sorting;
the hard rock rough sorting system is configured to separate second hard rocks from the broken balls under a screen to realize a second step sorting, the second hard rocks being smaller than the first hard rocks;
the hard rock fine sorting system performs a third step sorting on a part of the hard rocks taken out from the separated hard rocks due to the small particle size of the screen underflows and the incomplete separation of the hard rock rough sorting system; and the hard rock automatic return system is configured to return all the sorted materials sorted by the sorting system back to the production system, to realize an object of sorting in whole.
4. The iron fine removal and sorting system for magnetic hard rocks according to claim 3, wherein, the feeding system comprises a receiving hopper, a large inclination-angle belt, an intermediate material bin and a vibratory feeding, the receiving hopper uses a conical hopper structure, and after the hard rock materials are collected by the receiving hopper, the materials are continuously supplied into the large inclination-angle belt through the intermediate material bin, the large inclination-angle belt uses a structure having a large inclination-angle of 45 degrees and is configured to lift the supplied hard rocks to feed to the whole system, a belt material lifting structure in the feeding system uses a bucket-type scraper structure to ensure that the materials will not slide during a rising process, the hard rock materials will stay 4 to 6 hours in the intermediate material bin to ensure that a subsequent device is allowable to be continuously and fully fed and meet the needs of an equipment handling capacity; an electric opening gate is adopted at a bottom of the intermediate material bin to control a feeding amount of the materials; the vibratory feeding uses a heavy-duty vibratory feeder, which is configured to withstand pressure of part of the materials, and the materials are fed quantificationally into the next hard rock screening system.
5. The iron fine removal and sorting system for magnetic hard rocks according to claim 3, wherein, the hard rock screening system comprises a material inlet, a distributor, a screen, a 16999486.1 Date Regue/Date Received 2021-05-28 vibrating motor, a screen overflow outlet, a screen underflow outlet, a base and a vibrating spring; the material inlet is configured to receive the hard rock materials fed from the material bin, and the distributor is configured to perform a preliminary dispersion processing to the fed hard rock materials, the materials dispersed through the distributor enter the screen, and the materials are fully spread out under the vibration of the vibrating motor, the screen overflows enter into the screen overflow outlet, and the screen underflows enter into the screen underflow outlet, a lower portion of a vibrating screen is supported by the base, and the vibrating spring is configured to damp a vibrating portion to prevent the base from being damaged by fatigue and ensure the stability of the ground foundation.
6. The iron fine removal and sorting system for magnetic hard rocks according to claim 3, wherein, the hard rock unbroken ball sorting system comprises an unbroken ball detector, a guide plate, an actuating mechanism, a pneumatic push rod, an adjusting device, a material distribution mechanism, a ball output hopper and a hard rock output hopper;
the hard rock materials with large particle sizes fed from the screening system pass through the unbroken ball detector, when the unbroken ball detector detects a steel ball in the hard rocks, the actuating mechanism will receive a signal of incoming iron and immediately push the pneumatic push rod to change a track of the steel ball and sort the steel ball into the ball output hopper, and the hard rocks which are not detected directly enter into the hard rock output hopper, the adjusting device 5-5 is adopted to adjust an angle of the incoming materials to ensure an accuracy of the material distribution, and the material distribution mechanism is configured to adjust an angle of the discharge materials to ensure the coordination of the whole sorting system.
7. The iron fine removal and sorting system for magnetic hard rocks according to claim 2, wherein, the hard rock rough sorting system comprises a vibrating feeder, a transmission belt, a rough sorting detector, a transmission drum, a gear motor, a rough sorting pneumatic push rod, a rough sorting actuating mechanism, a material distribution board, a hard rock outlet and a broken ball outlet; when the screen underflows enter into the hard rock rough sorting system, the materials are evenly distributed on the transmission belt by the vibrating feeder and transmitted to a detection position of the rough sorting detector, and when the rough sorting 16999486.1 Date Regue/Date Received 2021-05-28 detector detects a signal of the iron, the signal is transmitted to the rough sorting pneumatic push rod, and the rough sorting actuating mechanism is pushed, the hard rocks are separated from the tramp iron at the position of the material distribution board, and the materials are introduced into a next sorting system through the hard rock outlet and the broken ball outlet.
8. The iron fine removal and sorting system for magnetic hard rocks according to claim 2, wherein, the hard rock fine sorting system comprises a channel type vibrating feeder, a fine sorting detector, a fine sorting pneumatic push rod, a fine sorting actuating mechanism, a material distribution board, a hard rock outlet and a broken ball outlet, after the rough sorting broken balls enter the fine sorting system, the rough sorting broken balls are transmitted to the detection position of the fine sorting detector by the channel type vibrating feeder, and when the fine sorting detector detects a signal of the iron, the signal is transmitted to the fine sorting pneumatic push rod, and the fine sorting actuating mechanism is pushed, the hard rocks are separated from the tramp iron at the position of the material distribution board, and the materials are introduced into a next sorting system through the hard rock outlet and the broken ball outlet.
9. The iron fine removal and sorting system for magnetic hard rocks according to claim 2, wherein, the hard rock automatic return system comprises a hard rock return conveyor, a hard rock return guide trough, an unbroken ball material bin and a broken ball material bin, the hard rock materials after sorting are returned into a hard rock conveyor line by the hard rock return conveyor through the hard rock return guide trough, and an unbroken ball materials enter into a semi-autogenous mill through the unbroken ball material bin, and the broken ball materials enter into the broken ball material bin, so that a return of the whole material sorting line is completed.

16999486.1 Date Regue/Date Received 2021-05-28
CA3069632A 2017-07-13 2017-08-03 Iron fine removal and sorting system for magnetic hard rocks Active CA3069632C (en)

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PCT/CN2017/095855 WO2019010738A1 (en) 2017-07-13 2017-08-03 Iron fine removal and sorting system for magnetic hard rocks

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