Metallurgical slag grinding system and process

Abstract

The application discloses a metallurgical slag grinding system and process, which comprises a feeding device, a conveying device, a crushing and grinding device, a weighing device, a screening device, a dust removal device, a bin and a control system which are sequentially connected. The screening device is arranged before and after the crushing and grinding device to perform twice screening. The conveying device conveys the metallurgical slag after the first screening to the crushing and grinding device for crushing and grinding, and then conveys the metallurgical slag to the screening device for the second screening. The metallurgical slag under the screen after the screening is conveyed to the next process by the conveying device, and the metallurgical slag on the screen is conveyed to the crushing and grinding device for the second grinding by the conveying device. The control system controls the feeding frequency of the feeding device through the driving current on the crushing and grinding device, so that the metallurgical slag material is orderly crushed and ground. The crushing rate and the metal content of the metallurgical slag can be accurately calculated by reading the weighing sensor values arranged on the conveying devices before and after the crushing and grinding, and the metal recovery rate and the working efficiency of the metallurgical slag are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid waste treatment, and particularly relates to a metallurgical slag grinding system and process. BACKGROUND

[0002] Metallurgical slag is a solid waste produced in the production process of metallurgical industry, mainly including steel metallurgical slag (blast furnace slag, steel slag, ferroalloy slag, steel dust and sludge, etc.), non-ferrous smelting slag (copper slag, lead slag, zinc slag, magnesium slag, etc.), electrolytic manganese slag and red mud, etc. collectively referred to as metallurgical slag. Taking steel slag as an example, steel slag is a waste produced in the steelmaking process, and the yield is generally about 10-15% of the steel yield. Steel slag contains various useful components: 2%-8% of metallic iron, 40%-60% of calcium oxide, 3%-10% of magnesium oxide, and 1%-8% of manganese oxide. Metallurgical slag can be used as a secondary resource for comprehensive utilization, and a large amount of metal and other useful elements can be recovered therefrom. Tailings powder can also be used as raw material for manufacturing road materials, building materials or agricultural fertilizers. The current processing efficiency and metal recovery rate of metallurgical slag are low. Firstly, the existing rod mill generally adopts the form of feeding at one end and discharging at the other end. The feeding port of the rod mill is a spiral structure, and the material is fed by relying on the rotation of the rod mill. The rotation speed of the rod mill is 20-40 / minute, which is very slow. When the particle size of the feed is greater than 5 cm, the rod mill is prone to jamming and clogging, which seriously affects the work efficiency. Secondly, the rod mill generally hoists out the steel rod for weighing and measuring the wear degree after working for a certain period of time. There is no good monitoring method for quantifying the wear of the steel rod, resulting in low work efficiency.

[0003] In view of the above problems, it is necessary to provide a metallurgical slag grinding system and process to improve the metal recovery rate in metallurgical slag and the work efficiency of processing metallurgical slag. SUMMARY

[0004] In order to solve or improve the above technical problems, the present application provides a metallurgical slag grinding system and process to improve the processing efficiency and metal recovery rate of metallurgical slag.

[0005] The application provides a metallurgical slag grinding system, which comprises a feeding device, a conveying device, a crushing and grinding device, a weighing device, a screening device, a dust removal device, a bin and a control system connected in sequence, the screening device comprises a screening device I and a screening device II, the feeding device is connected with the screening device I, the screening device I is arranged in front of the crushing and grinding device and is used for removing large pieces of metallurgical slag, the screening device II is arranged behind the crushing and grinding device and is used for screening the crushed metallurgical slag, the conveying device conveys the metallurgical slag screened by the screening device I once to the crushing and grinding device for crushing and grinding, and then conveys the metallurgical slag to the screening device II for secondary screening, the metallurgical slag under the screen after screening is conveyed to the next process or the bin by the conveying device, and the metallurgical slag on the screen is conveyed to the crushing and grinding device for re-crushing and grinding by the conveying device.

[0006] The dust removal device comprises a dust collector, a dust collection port and a conveying pipeline, and the dust collection port is arranged on the screening device and the crushing and grinding device.

[0007] The weighing device is arranged on the conveying device in front of the crushing and grinding device and on the conveying device conveying the metallurgical slag under the screen after secondary screening, and the control system is connected with the feeding device, the conveying device, the crushing and grinding device, the weighing device, the screening device and the dust removal device.

[0008] Further, the feeding device is an electromagnetic vibrating feeder, the screening device I is a cantilever screen vibrating screen, one end of the electromagnetic vibrating feeder I is connected with one end of the cantilever screen vibrating screen, raw materials are conveyed to the cantilever screen vibrating screen for screening, the screen grid size of the cantilever screen vibrating screen is 80-300 mm, the belt conveyor I is arranged below the cantilever screen vibrating screen, and the belt conveyor I is connected with the electromagnetic vibrating feeder II through a material guide groove.

[0009] Further, the crushing and grinding device comprises a rod mill, the rod mill comprises a roller, an end plate, a feeding port and a discharging port, the end plate comprises a front end plate and a rear end plate, the feeding port is arranged on the front end plate, the feeding port is connected with one end of the electromagnetic vibrating feeder II, an annular plate is arranged on the outer side of the roller wall close to the rear end plate, the discharging port is arranged in the annular groove formed by the annular plate in sequence and uniformly, and a lining plate and a steel rod are arranged in the roller.

[0010] Further, the end face shape of the lining plate is a "convex" shape, and the two waist lines are different size circular arcs with the same radius, the radius of the circular arc is the same as the radius of the steel bar, the lining plate is connected with the roller through the mounting hole, the surface of the lining plate and the roller is a circular arc surface, and the circular arc radius of the circular arc surface is the same as the circular arc radius of the inner wall of the roller, the direction of the large circular arc waist line of the lining plate is consistent with the movement direction of the roller; the unequal circular arc makes the steel bar thrown higher in the rod mill, and the potential energy of the falling is larger, thereby improving the grinding effect.

[0011] Further, the electromagnetic vibrating feeder II is connected with the rod mill feed inlet through a material guiding device, the material guiding device is a semi-open U-shaped pipe, can transport large blocks of metallurgical slag, and is convenient for cleaning the adhered metallurgical slag powder, one end of the material guiding device is inclined and extends into the roller and is flush with the lining plate, can directly send the metallurgical slag material into the rod mill roller, thereby improving the conveying efficiency, and the inclination angle is set to 5-10°, and the small inclination angle is more conducive to the sliding of the metallurgical slag.

[0012] Further, a belt conveyor II is arranged below the discharge port, and the discharge end of the belt conveyor II is connected with the screening device II.

[0013] Further, the screening device II is a circular vibrating screen, the mesh size of the screen of the circular vibrating screen is set to 10-25 mm, a belt conveyor V is arranged below the circular vibrating screen, and is used to convey the metallurgical slag smaller than the mesh aperture of the screen, and the discharge end of the metallurgical slag on the screen of the circular vibrating screen is connected with the belt conveyor III.

[0014] Further, the weighing device is a belt scale, including a belt scale I and a belt scale II, the belt scale I is arranged on the belt conveyor I, and is used to weigh the weight of the metallurgical slag entering the rod mill from the electromagnetic vibrating feeder I, and the belt scale II is arranged on the belt conveyor V, and is used to weigh the weight of the metallurgical slag smaller than the mesh aperture of the screen after crushing and screening.

[0015] Further, the magnetic separation device is also included, which comprises a magnetic separation device I and a magnetic separation device II, the magnetic separation device I is an electromagnetic magnetic separation machine, the magnetic separation device II is a permanent magnetic separation machine, the discharge end of the belt conveyor III is connected with the feeding end of the electromagnetic magnetic separation machine, which is used for the magnetic separation of metallurgical slag on the belt conveyor III, the lower side of the discharge end of the electromagnetic magnetic separation machine is provided with a belt conveyor IV, the other end of the belt conveyor IV is connected with the electromagnetic vibrating feeder II, which is used for conveying the non-iron metallurgical slag larger than the mesh size of the circular vibrating screen screen mesh to the rod mill for regrinding and crushing, the other end of the discharge end of the electromagnetic magnetic separation machine is provided with a belt conveyor VIII, the belt conveyor VIII is used for conveying the iron-containing metallurgical slag to the stock bin, the discharge end of the belt conveyor V is connected with the feeding end of the permanent magnetic separation machine, which is used for the magnetic separation of the metallurgical slag smaller than the mesh size of the circular vibrating screen screen mesh, the electromagnetic magnetic separation machine I and the permanent magnetic separation machine are connected with the control system.

[0016] Further, the belt conveyor V is connected with the permanent magnetic separation machine through a hopper, the hopper is provided with a distributor below, the distributor is connected with the feeding end of the permanent magnetic separation machine, the distributor comprises a distributor groove and a rack, a plurality of layers of flow guides are arranged in the distributor groove, the flow guides can be arranged in different layers according to requirements, the rack is connected with the distributor groove through an adjustable support, a vibrating motor is arranged on the outside of the distributor groove, the gap between the distributor groove and the permanent magnetic separation machine is adjusted through the adjustable support, and the gap is adjusted according to different particle sizes of the metallurgical slag material, so that the magnetic separation rate is improved.

[0017] Further, the permanent magnetic separation machine is provided with A and B two discharge ports, a chute I is arranged below the A port, a belt conveyor VI is arranged below the chute I, a chute II is arranged below the B port, and a belt conveyor VII is arranged below the chute II, the belt conveyor VI is used for conveying metallurgical tailings, the belt conveyor VII is used for conveying iron-containing particles and iron-containing powder, and a belt scale III is arranged on the belt conveyor VII.

[0018] Further, the control system comprises a frequency converter, an external control interface, a current sensor and an instrument, the frequency converter is connected with the driving motor of the electromagnetic vibrating feeder I, and the current sensor is connected with the driving motor of the rod mill.

[0019] Further, a metallurgical slag grinding process is characterized by comprising the following steps:

[0020] S1: starting

[0021] The control system, the feeding device, the conveying device, the weighing device, the screening device, the magnetic separation device and the dust removal device are started;

[0022] S2: primary screening

[0023] The electromagnetic vibrating feeder I delivers the metallurgical slag to the cantilever screen vibration sieve for primary screening, and removes large pieces of metallurgical slag;

[0024] S3: crushing

[0025] The belt conveyor I delivers the metallurgical slag not greater than 80-300mm after the primary screening by the cantilever screen vibration sieve to the rod mill through the material guide groove and the electromagnetic vibrating feeder II for crushing. The control system collects the parameters of the belt scale I. During the crushing process, the control system collects the driving motor current of the rod mill through the current sensor. When the collected current is greater than or less than 60% of the rated current, the control system automatically adjusts the frequency of the frequency converter to equal to 60% of the rated current of the driving current of the rod mill. Moreover, when the driving current of the rod mill is equal to 60% of the rated current, the value of the belt scale I is recorded as the reference value. When the value of the belt scale I is within the range of the reference value, and the driving current of the rod mill exceeds ±15% of 60% of the rated current, the control system alarms and prompts the abnormality;

[0026] S4: secondary screening

[0027] The belt conveyor II delivers the metallurgical slag crushed by the rod mill to the circular vibration sieve for secondary screening. The metallurgical slag greater than the screen grid aperture of the circular vibration sieve is delivered to the stock bin or for further screening by the belt conveyor III, and the metallurgical slag smaller than the screen grid aperture of the circular vibration sieve is delivered to the stock bin or for further screening by the belt conveyor V;

[0028] S5: magnetic separation

[0029] When the metallurgical slag is steel metallurgical slag, magnetic separation is required. The metallurgical slag greater than the screen grid aperture of the circular vibration sieve is delivered to the electromagnetic magnetic separator for magnetic separation by the belt conveyor III 23. The metallurgical tailings after iron removal are delivered to the electromagnetic vibrating feeder II by the belt conveyor IV, and are delivered to the rod mill for further crushing and grinding, which greatly improves the crushing efficiency. The iron-containing slag blocks selected by the magnetic separation are delivered to the stock bin by the belt conveyor VIII;

[0030] Metallurgical slag smaller than the circular vibrating screen mesh size is conveyed to the permanent magnetic separator by the belt conveyor V for magnetic separation, the gap between the uniform distribution tank and the permanent magnetic separator is adjusted to the appropriate position before magnetic separation, the gap is not greater than the circular vibrating screen mesh size, the metallurgical slag material after spreading and thinning by the uniform distribution tank enters the permanent magnetic separator for magnetic separation, which is more conducive to improving the magnetic separation rate, the tailings after iron removal are conveyed to the bin or subjected to re-screening by the chute I and the belt conveyor VI, and the iron-containing particles and powder are conveyed to the bin or subjected to re-screening by the chute II and the belt conveyor VII.

[0031] S6: metering

[0032] The control system collects the parameters of the belt scale I, the belt scale II and the belt scale III, the control system automatically calculates the crushing coefficient K1 of the metallurgical slag after secondary screening according to the parameters of the belt scale I and the belt scale II, and draws a metallurgical slag crushing curve, different metallurgical slag processing K1 values are different, according to the metallurgical slag crushing curve, a warning value is set, when the warning value is lower, the control system alarms and prompts that the working condition of the rod mill should be checked, the wear of the steel rod is checked, the steel rod wear coefficient K2 per ton of metallurgical slag can be calculated from the wear of the steel rod, different metallurgical slag processing K2 values are different, and whether the steel rod needs to be replaced can be accurately judged according to the K1 and K2 values.

[0033] The control system can calculate the content of iron-containing particles and metallurgical slag iron powder per ton of metallurgical slag by collecting the parameters of the belt scale I, the belt scale II and the belt scale III. Advantages

[0034] The system is connected with the guide device of the electromagnetic vibrating feeder II through the setting of the rod mill feed inlet, which can directly convey the metallurgical slag into the rod mill, changes the existing spiral feeding and conveying, improves the feeding efficiency and the feeding block size of the metallurgical slag, and makes the discharge more smooth and fast, and the crushing efficiency of the metallurgical slag can be improved by more than 30%.

[0035] The asymmetric "circular arc waist line" setting of the liner plate of the rod mill increases the throwing height of the steel rod, the falling potential energy is larger, and the grinding efficiency and effect of the metallurgical slag are improved.

[0036] Different magnetic separators are selected for different metallurgical slag particles during magnetic separation, an electromagnetic magnetic separator is selected for large-particle metallurgical slag, and a permanent magnetic separator is selected for small-particle metallurgical slag, which is better in magnetic separation effect; and the metallurgical slag is vibrated, spread and thinned by the uniform distribution tank before entering the permanent magnetic separator, which improves the magnetic separation effect of small-particle metallurgical slag.

[0037] By collecting the current of the rod mill driving motor, the frequency of the frequency converter of the electromagnetic vibrating feeder is adjusted according to the size of the current to change the feeding amount of the electromagnetic vibrating feeder, so that the overload or shortage of metallurgical slag material on the belt conveyor is avoided.

[0038] By collecting the parameters of the belt scale I, the belt scale II and the belt scale III through the control system, the crushing coefficient K1 of the batch of metallurgical slag and the steel rod wear coefficient K2 can be calculated, a reasonable early warning value is set, problems and the wear of the steel rod are found in time, and the grinding efficiency and quality of the metallurgical slag are improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the present application or prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a process flow schematic diagram in the embodiment of the present application.

[0042] Figure 2 It is a process flow structure schematic diagram in the embodiment of the present application.

[0043] Figure 3 It is a rod mill structure schematic diagram in the embodiment of the present application.

[0044] Figure 4 It is a lining plate installation schematic diagram in the embodiment of the present application.

[0045] Figure 5 It is a lining plate structure schematic diagram in the embodiment of the present application.

[0046] Figure 6 It is a guide device end surface structure schematic diagram in the embodiment of the present application.

[0047] Figure 7 It is a permanent magnet magnetic separator structure schematic diagram in the embodiment of the present application.

[0048] Figure 8 It is a magnetic separation schematic diagram in the embodiment of the present application.

[0049] Figure 9 It is a uniform distribution groove structure schematic diagram in the embodiment of the present application.

[0050] Among them:

[0051] 1, feeding device; 11, electromagnetic vibrating feeder I; 12, electromagnetic vibrating feeder II; 121, guide device;

[0052] Conveying device; 21, belt conveyor I; 211, material guide chute; 22, belt conveyor II; 23, belt conveyor III; 24, belt conveyor IV; 25, belt conveyor V; 26, belt conveyor VI; 27, belt conveyor VII; 28, belt conveyor VIII; 3, grinding and crushing device; 31, rod mill; 311, roller; 312, front end plate; 313, rear end plate; 314, feeding port; 315, discharging port; 316, liner plate; 317, steel rod; 4, weighing device; 41, belt scale I; 42, belt scale II; 43, belt scale III; 5, screening device; 51, cantilever screen vibration screen; 52, circular vibration screen; 6, dust removal device; 61, dust collector; 62, dust collection port; 7, stock bin; 8, control system; 9, magnetic separation device; 91, electromagnetic magnetic separator; 92, permanent magnetic separator; 921, hopper; 922, uniform distributor; 9221, uniform distribution groove; 9222, rack; 9223, adjustable support; 923, chute I; 924, chute II. Embodiments

[0053] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In addition, in combination Figures 1-9 The technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict.

[0056] As Figure 1 , 2The shown: a metallurgical slag grinding system, including feeding device 1, conveying device 2, crushing and grinding device 3, weighing device 4, screening device 5, dust removal device 6, silo 7 and control system 8 connected in turn, screening device 5 includes screening device I 51 and screening device II 52; feeding device 1 is connected with screening device I 51, which feeds metallurgical slag material to screening device I, and screening device I 51 removes large pieces of metallurgical slag, then connects with crushing and grinding device 3 through belt conveyor I 21, and belt conveyor II 22 conveys the ground metallurgical slag to screening device II 52 for secondary screening, and screening device II 52 screens the crushed metallurgical slag, and the metallurgical slag under the screen after screening is conveyed to the next process or silo 7 through belt conveyor V 25, and the metallurgical slag on the screen is conveyed to crushing and grinding device 3 for regrinding and crushing;

[0057] Dust removal device 6 includes dust collector 61, dust collection port 62 and conveying pipeline, and dust collection port 62 is arranged on screening device 4 and crushing and grinding device 3;

[0058] Weighing device 4 is arranged on conveying device 2 before crushing and grinding device 3 and on conveying device 2 conveying the metallurgical slag under the screen after secondary screening, and control system 8 is connected with feeding device 1, conveying device 2, crushing and grinding device 3, weighing device 4, screening device 5 and dust removal device 6.

[0059] The feeding device is an electromagnetic vibrating feeder, including electromagnetic vibrating feeder I 11 and electromagnetic vibrating feeder II 12, and the vibrating feeder is used to avoid material adhesion. The screening device I 51 is a cantilever screen vibrating screen, one end of the electromagnetic vibrating feeder I 11 is connected with one end of the cantilever screen vibrating screen 51, the screen mesh size of the cantilever screen vibrating screen 51 is set to 80-300mm, and the screen mesh size can be adjusted and replaced according to actual needs. The cantilever screen vibrating screen 51 is provided with belt conveyor I 21 below, the belt conveyor I 21 is fully enclosed, dust collection ports 62 are arranged above the cantilever screen vibrating screen 51 and at the inlet and outlet of the belt conveyor I 21, the dust collection ports 62 are connected with the dust collector 61 through pipelines, and the belt conveyor I 21 is connected with the electromagnetic vibrating feeder II 12 through the guide chute 211.

[0060] See Figure 3, the broken grinding device 3 includes a rod mill 31, the rod mill 31 is circumscribed by a driving motor and a speed reduction mechanism, the rod mill 31 includes a drum 311, an end plate, a feeding port 314 and a discharging port 315, the end plate includes a front end plate 312 and a rear end plate 313, the feeding port 314 is arranged on the front end plate 312 and connected with one end of the electromagnetic vibrating feeder II 22, a ring plate is sleeved on the outer side of the drum 311 wall close to the rear end plate 313, the discharging port 315 is sequentially and uniformly arranged in the annular groove formed by the ring plate, and multiple discharging ports 315 can be arranged according to requirements, the discharging port 315 is arranged on the drum 311 wall instead of the rear end plate, so that the discharging efficiency is improved, according to the grinding effect of the metallurgical slag, the annular groove has a guiding effect, so that the metallurgical slag is not easy to splash when discharging, and the drum 311 is provided with a lining plate 316 and a steel bar 317.

[0061] See Figure 4 and Figure 5 , the end face shape of the lining plate 316 is similar to a "convex" shape, and the two waist lines are different size circular arcs with the same radius, the radius of the circular arc is the same as that of the steel bar 317, the lining plate 316 is provided with a mounting hole 3161, the mounting hole 3161 is a through hole, the lining plate 316 is fixed on the drum 311 wall through bolts, the mounting surface of the lining plate 316 in contact with the drum 311 is a circular arc surface, and the radius of the circular arc surface is the same as that of the drum 311, the direction of the large circular arc waist line of the lining plate 316 is consistent with the movement direction of the drum 311, and the unequal circular arc waist lines make the steel bar 317 thrown higher in the rod mill 31, so that the potential energy of falling is larger, and the grinding effect is improved.

[0062] See Figure 3 , Figure 6 , the electromagnetic vibrating feeder II 22 is connected with the feeding port 314 of the rod mill 31 through a material guiding device 121, the material guiding device 121 is a semi-open U-shaped pipe, one end of the material guiding device 121 is inclined to extend into the drum 311 and is flush with the lining plate 316, and the inclination angle is 5-10°, the semi-open U-shaped material guiding device can convey large blocky metallurgical slag, and the largest blocky metallurgical slag that can be conveyed is 300 mm, which is much higher than the industry level of 80 mm, and the metallurgical slag material can be directly conveyed into the drum 311, so that the conveying efficiency is greatly improved, the semi-open structure is more convenient for cleaning the adhered metallurgical slag powder, and the small inclination angle is more conducive to the sliding of the metallurgical slag.

[0063] Through the arrangement of the lining plate 316, the discharging port 315 and the material guiding device 121, the feeding and discharging efficiency and the feeding specification of the metallurgical slag are greatly improved, the efficiency is increased by more than 30%, and the technical problems at the present stage are solved.

[0064] See Figure 1 , 2The belt conveyor II 22 is arranged below the discharge port 315 of the rod mill 31 and is used to convey the metallurgical slag material ground and crushed by the rod mill 31. The discharge end of the belt conveyor II 22 is connected to the screening device 52.

[0065] See Figure 1 , 2 The screening device 52 is a circular vibrating screen. The mesh size of the screen of the circular vibrating screen 52 is set to 10-25 mm. The mesh size of the screen can be adjusted and replaced according to actual needs. The belt conveyor V 25 is arranged below the circular vibrating screen 52 and is used to convey the metallurgical slag smaller than the mesh size of the screen. The discharge end of the metallurgical slag on the screen of the circular vibrating screen 52 is connected to the belt conveyor III 23.

[0066] See Figure 1 , 2 The weighing device 4 is a belt scale, which includes the belt scale I 41 and the belt scale II 42. The belt scale I 41 is arranged on the belt conveyor I 21 and is used to weigh the metallurgical slag entering the rod mill 31 from the electromagnetic vibrating feeder I 11. The belt scale II 42 is arranged on the belt conveyor V 25 and is used to weigh the metallurgical slag smaller than the mesh size of the screen after crushing and screening. The crushing rate of the metallurgical slag can be calculated through the values of the belt scale I 41 and the belt scale II 42.

[0067] See Figure 1 , 2 , 7, 8, If the ground metallurgical slag is steel slag, the system is further provided with a magnetic separation device 9, which includes the magnetic separation device I 91 and the magnetic separation device II 92. The magnetic separation device I 91 is an electromagnetic magnetic separation machine, and the magnetic separation device II 92 is a permanent magnetic separation machine. Different types of magnetic separation machines are arranged for metallurgical slag of different particle sizes, so that the magnetic separation effect is better. The discharge end of the belt conveyor III 23 is connected to the feeding end of the electromagnetic magnetic separation machine 91, which is used for magnetic separation of the metallurgical slag on the belt conveyor III 23. The metallurgical slag on the belt conveyor III 23 is the metallurgical slag on the screen of the circular vibrating screen 52. The electromagnetic magnetic separation machine 91 has two discharge ends for magnetic material and non-magnetic material. A belt conveyor IV 24 is arranged below one end, and the discharge end of the belt conveyor IV 24 is connected to the electromagnetic vibrating feeder II 12, which is used to convey the non-ferrous metallurgical slag larger than the mesh size of the screen of the circular vibrating screen to the rod mill 31 for further grinding and crushing. A belt conveyor VIII 28 is arranged below the other end of the electromagnetic magnetic separation machine 91, which is used to convey the ferrous metallurgical slag separated by the electromagnetic magnetic separation machine to the bin 7. The discharge end of the belt conveyor V 25 is connected to the feeding end of the permanent magnetic separation machine 92, which is used for magnetic separation of the metallurgical slag smaller than the mesh size of the screen of the circular vibrating screen 52. The electromagnetic magnetic separation machine I 91 and the permanent magnetic separation machine 92 are connected to the control system 8.

[0068] See Figure 7 , 8, 9, the belt conveyor V 25 is connected with the permanent magnetic separator 92 through the hopper 921, the hopper 921 is provided with the distributor 922 below, the distributor 922 includes the distribution groove 9221 and the rack 9222, the rack 9222 is connected with the distribution groove 9221 through the adjustable support 9223, a plurality of layers of flow guide plates are arranged in the distribution groove 9221, a vibration motor is arranged on the distribution groove 9221, the metallurgical slag material in the distribution groove 9221 can be flattened and thinned and is not easy to adhere to the groove, the distribution groove 9221 is connected with the feed inlet of the permanent magnetic separator 92, the gap between the distribution groove 9221 and the feed inlet of the permanent magnetic separator 92 is adjusted in size through the bolt of the adjustable support 9223, the appropriate gap can be adjusted for metallurgical slag of different particle sizes, the metallurgical slag entering the permanent magnetic separator is ensured not to be accumulated, and the magnetic separation effect is ensured.

[0069] The permanent magnetic separator 92 is provided with two discharge ports A and B, the A port is connected with the chute I 923, the chute I 923 is provided with the belt conveyor VI 26 below, the B port is connected with the chute II 924, the chute II 924 is provided with the belt conveyor VII 925 below, the belt conveyor VI 26 is used to convey metallurgical tailings, the metallurgical tailings can be continuously screened according to needs, and finer particles are separated, the belt conveyor VII 27 is used to convey iron-containing particles and powder, the belt conveyor VII 27 is provided with the belt scale III 43, and the iron content and the crushing rate of the metallurgical slag can be accurately calculated according to the values of the belt scale I 41, the belt scale II 42 and the belt scale III 43.

[0070] The control system is PLC control, including a frequency converter, an external control interface, a current sensor and an instrument, the frequency converter is connected with the driving motor of the electromagnetic vibrating feeder I 11, and the current sensor is connected with the driving motor of the rod mill 31.

[0071] A metallurgical slag grinding process, comprising the following steps:

[0072] S1: starting

[0073] The control system 8, the feeding device 1, the conveying device 2, the crushing and grinding device 3, the weighing device 4, the screening device 5, the dust removal device 6 and the magnetic separation device 9 are started;

[0074] S2: primary screening

[0075] The electromagnetic vibrating feeder I 11 conveys the metallurgical slag to the cantilever screen vibrating screen 51 to perform primary screening, and removes large blocks of metallurgical slag;

[0076] S3: crushing

[0077] The belt conveyor I 21 conveys the metallurgical slag which is not greater than 80-300mm after once screening by the cantilever screen 51 to the rod mill 31 through the material guide chute 211 and the electromagnetic vibrating feeder II 12. The control system 8 collects the parameters of the belt scale I 41. During the crushing process, the control system 8 collects the driving motor current of the rod mill 31 through the current sensor. When the collected current is greater than or less than 60% of the rated current, the control system 8 automatically adjusts the frequency of the frequency converter, and adjusts the feeding speed of the electromagnetic vibrating feeder I 11 through the adjustment of the frequency of the frequency converter. When the driving current of the rod mill 31 is equal to 60% of the rated current, the adjustment of the frequency converter is stopped. Moreover, the value of the belt scale I 41 when the driving current of the rod mill 31 is equal to 60% of the rated current is recorded as the reference value. When the value of the belt scale I 41 is within the range of the reference value, and the driving current of the rod mill 31 is greater than or less than 60% of the rated current by ±15%, the control system 8 alarms to indicate the abnormality.

[0078] S4: secondary screening

[0079] The belt conveyor II 22 conveys the metallurgical slag crushed by the rod mill to the circular vibrating screen 52 for secondary screening. The metallurgical slag greater than the screen grid aperture of the circular vibrating screen 52 is conveyed to the stock bin or subjected to further screening through the belt conveyor III 23. The metallurgical slag smaller than the screen grid aperture of the circular vibrating screen 52 is conveyed to the stock bin or subjected to further screening through the belt conveyor V 25.

[0080] S5: magnetic separation

[0081] The metallurgical slag greater than the screen grid aperture of the circular vibrating screen 52 is conveyed to the electromagnetic magnetic separator 91 for magnetic separation. The metallurgical tailings after iron removal are conveyed to the electromagnetic vibrating feeder II 12 through the belt conveyor IV 26, and are subjected to further crushing and grinding by the rod mill 31, thereby greatly improving the crushing efficiency. The iron-containing slag lumps after magnetic separation are conveyed to the stock bin 7 by the belt conveyor VIII 28.

[0082] The metallurgical slag smaller than the screen grid aperture of the circular vibrating screen 52 is conveyed to the permanent magnetic separator 92 for magnetic separation. The gap between the uniform distribution chute 9221 and the feed of the permanent magnetic separator 92 is adjusted to an appropriate position before magnetic separation. The gap is not greater than the screen grid aperture of the circular vibrating screen. After the metallurgical slag material enters the uniform distribution chute 9221, the material is flattened and thinned by the guide plate of the uniform distribution chute 9221 and the vibration of the vibrating motor, and then enters the permanent magnetic separator 92 for magnetic separation, thereby being more conducive to improving the magnetic separation rate. The tailings after iron removal are conveyed to the stock bin 7 or subjected to further screening through the chute I 923 and the belt conveyor VI 26. The iron-containing particles and powders are conveyed to the stock bin 7 or subjected to further screening through the chute II 924 and the belt conveyor VII 27.

[0083] S6: metering

[0084] The control system 8 collects the parameters of the belt scale I 41, the belt scale II 42 and the belt scale III 43, and the control system 8 automatically calculates the crushing coefficient K1 of the metallurgical slag after secondary screening according to the parameters of the belt scale I 41 and the belt scale II 42, the K1 value is equal to the value of the belt scale II 42 divided by the value of the belt scale I 41, the crushing curve of the metallurgical slag is drawn, the K1 value is different for different metallurgical slag treatment, according to the crushing curve of the metallurgical slag, the early warning value is set, when the early warning value is lower, the control system 8 alarms and prompts, the working condition of the rod mill 31 should be checked, the wear amount of the steel rod 317 of the rod mill 31 is checked, the steel rod wear coefficient K2 of the rod mill 31 per ton of metallurgical slag can be calculated according to the wear amount of the steel rod 317 of the rod mill 31, the K2 value is different for different metallurgical slag treatment, according to the K1 and K2 values, whether the steel rod needs to be replaced can be accurately judged, the problem is found in time, and the overwork of the steel rod 317 is avoided.

[0085] The control system 8 can calculate the content of the iron-containing particle slag steel and the metallurgical slag iron powder per ton of metallurgical slag by collecting the parameters of the belt scale I 41, the belt scale II 42 and the belt scale III 43.

[0086] In addition, various different embodiments of the embodiments of the present application can also be combined arbitrarily, as long as they do not deviate from the idea of the embodiments of the present application, they should also be considered as disclosed by the embodiments of the present application.

Claims

1. A metallurgical slag grinding system, comprising a feeding device, a conveying device, a crushing and grinding device, a weighing device, a screening device, a dust removal device, a silo, and a control system connected in sequence, characterized in that: The feeding device is an electromagnetic vibrating feeder, including electromagnetic vibrating feeder I and electromagnetic vibrating feeder II. The screening device includes screening device I and screening device II. A belt conveyor I is arranged below the screening device I. The feeding device is connected to the screening device I. The screening device I is arranged in front of the crushing and grinding device to remove large pieces of metallurgical slag. The screening device II is arranged behind the crushing and grinding device to screen the crushed metallurgical slag. The conveying device conveys the metallurgical slag that has been screened once by the screening device I into the crushing and grinding device for grinding and crushing, and then conveys it to the screening device II for secondary screening. A belt conveyor V is arranged below the screening device II to convey the metallurgical slag smaller than the aperture of the screen mesh. The metallurgical slag under the screen after screening is conveyed by the conveying device to the next process or the storage bin. The metallurgical slag on the screen is conveyed by the conveying device into the crushing and grinding device for re-grinding and crushing; The crushing and grinding device includes a rod mill, which includes a drum, end plates, a feed inlet and a discharge outlet. The end plates include a front end plate and a rear end plate. The feed inlet is arranged on the front end plate and is connected to one end of the electromagnetic vibrating feeder II. An annular plate is sleeved outside the drum wall near the rear end plate. The discharge outlet sequentially and uniformly penetrates through the drum wall and is arranged in the annular groove formed by the annular plate. Liners and steel rods are arranged inside the drum. The end face shape of the liner is similar to a "convex" shape, and the two waistlines are large and small arcs with the same radius but different lengths. The radius of the arc is the same as the radius of the steel rod. Installation holes are arranged on the liner, and the liner is connected to the drum through the installation holes. The surface of the liner that is installed and fitted with the drum is an arc surface, and the arc radius of the arc surface is the same as the inner wall arc radius of the drum. The direction of the large arc waistline of the liner is the same as the movement direction of the drum; the unequal arcs make the steel rods throw higher in the rod mill, and the falling potential energy is greater, improving the grinding effect.

2. The metallurgical slag grinding system according to claim 1, characterized in that: The dust removal device includes a dust collector, a dust collection port and a conveying pipeline. The dust collection port is arranged on the screening device and the crushing and grinding device; the weighing device is arranged on the conveying device in front of the crushing and grinding device and on the conveying device for conveying the metallurgical slag under the screen after secondary screening. The weighing device is a belt scale, including belt scale I and belt scale II. Belt scale I is arranged on the belt conveyor I to weigh the weight of the metallurgical slag entering the rod mill from the feeding device. Belt scale II is arranged on the belt conveyor V to weigh the weight of the metallurgical slag smaller than the aperture of the screen mesh after crushing and screening. The control system automatically calculates the crushing coefficient K1 of the metallurgical slag after secondary screening through the parameters of belt scale I and belt scale II; the control system is connected to the feeding device, the conveying device, the crushing and grinding device, the weighing device, the screening device and the dust removal device.

3. The metallurgical slag grinding system according to claim 2, characterized in that: The screening device I is a cantilever vibrating screen. One end of the electromagnetic vibrating feeder I is connected to one end of the cantilever vibrating screen. The screen mesh size of the cantilever vibrating screen is set to 80-300mm. The belt conveyor I installed below the cantilever vibrating screen is connected to the electromagnetic vibrating feeder II through a guide chute.

4. The metallurgical slag grinding system according to claim 3, characterized in that: The electromagnetic vibrating feeder II is connected to the feed inlet of the rod mill via a guiding device. The guiding device is a semi-open U-shaped tube, with one end of the guiding device extending obliquely into the drum and flush with the liner. The oblique angle is set to 5-10°.

5. The metallurgical slag grinding system according to claim 4, characterized in that: A belt conveyor II is installed below the discharge port, and the discharge end of the belt conveyor II is connected to the screening device II.

6. The metallurgical slag grinding system according to claim 5, characterized in that: The screening device II is a circular vibrating screen, and the mesh size of the screen is set to 10-25mm. The discharge end of the metallurgical slag on the screen is connected to the belt conveyor III.

7. The metallurgical slag grinding system according to claim 6, characterized in that: It also includes a magnetic separation device, which comprises magnetic separation device I and magnetic separation device II. Magnetic separation device I is an electromagnetic magnetic separator, and magnetic separation device II is a permanent magnet magnetic separator. The discharge end of the belt conveyor III is connected to the feed end of the electromagnetic magnetic separator for magnetic separation of metallurgical slag on the belt conveyor III. A belt conveyor IV is installed below the discharge end of the electromagnetic magnetic separator, and the other end of the belt conveyor IV is connected to the electromagnetic vibrating feeder II to convey the magnetically separated slag. Metallurgical slag containing iron and larger than the mesh size of the circular vibrating screen is ground and crushed again in the rod mill. A belt conveyor VIII is installed below the other end of the electromagnetic separator's discharge end. The belt conveyor VIII transports the magnetically separated iron-containing metallurgical slag to the silo. The discharge end of the belt conveyor V is connected to the feed end of the permanent magnet separator to magnetically separate metallurgical slag smaller than the mesh size of the circular vibrating screen. The electromagnetic separator and the permanent magnet separator are connected to the control system.

8. The metallurgical slag grinding system according to claim 7, characterized in that: The belt conveyor V is connected to the permanent magnet separator via a hopper. A distributor is installed below the hopper. The feed end of the permanent magnet separator is connected to the distributor. The distributor includes a distribution trough and a frame. Multiple layers of guide plates are installed inside the distribution trough. The frame is connected to the distribution trough via an adjustable bracket. A vibration motor is installed on the outside of the distribution trough. The gap between the distribution trough and the permanent magnet separator is adjusted by the adjustable bracket.

9. The metallurgical slag grinding system according to claim 8, characterized in that: The permanent magnet separator has two discharge ports, A and B. A chute I is installed under port A, and a belt conveyor VI is installed under chute I. A chute II is installed under port B, and a belt conveyor VII is installed under chute II. The belt conveyor VI is used to transport metallurgical tailings, and the belt conveyor VII is used to transport iron-containing particles and powders. A belt scale III is installed on the belt conveyor VII.

10. The metallurgical slag grinding system according to claim 9, characterized in that: The control system includes a frequency converter, an external control interface, a current sensor, and instruments. The frequency converter is connected to the drive motor of the electromagnetic vibrating feeder I, and the current sensor is connected to the drive motor of the rod mill.

11. The metallurgical slag grinding process of the metallurgical slag grinding system according to claim 10, characterized in that: Includes the following steps: S1: Start Start the control system, the feeding device, the conveying device, the crushing and grinding device, the weighing device, the screening device, the magnetic separation device, and the dust removal device; S2: Primary screening The feeding device I conveys the metallurgical slag to the cantilever screen vibrating screen for the first screening to remove large pieces of metallurgical slag; S3: Broken The belt conveyor I transports metallurgical slag, which has been screened once by the cantilever vibrating screen and is no larger than the mesh size of the cantilever vibrating screen, to the rod mill for crushing via the feed chute and the electromagnetic vibrating feeder II. The control system collects parameters from the belt scale I. During the crushing process, the control system collects the drive motor current of the rod mill through the current sensor. When the collected current is greater than or less than 60% of its rated current, the control system automatically adjusts the frequency converter frequency until the drive current of the rod mill is equal to 60% of its rated current. Furthermore, when the drive current of the rod mill is equal to 60% of its rated current, the value of the belt scale I is recorded as the reference value. When the value of the belt scale I is within the range of the reference value, but the drive current of the rod mill exceeds ±15% of 60% of its rated current, the control system alarms to indicate an abnormality. S4: Secondary screening The belt conveyor II transports the metallurgical slag crushed by the rod mill to the circular vibrating screen for a second screening. Metallurgical slag larger than the mesh size of the circular vibrating screen is transported to the silo or screened again by the belt conveyor III, while metallurgical slag smaller than the mesh size of the circular vibrating screen is transported to the silo or screened again by the belt conveyor V. S5: Magnetic Separation Metallurgical slag larger than the mesh size of the circular vibrating screen is conveyed by the belt conveyor III23 into the electromagnetic separator for magnetic separation. After iron removal, the metallurgical tailings are conveyed by the belt conveyor IV to the electromagnetic vibrating feeder II, and then to the rod mill for further crushing and grinding, which greatly improves the crushing efficiency. The iron-containing slag blocks separated by magnetic separation are conveyed by the belt conveyor VIII to the silo. Metallurgical slag smaller than the mesh size of the circular vibrating screen is conveyed by belt conveyor V to the permanent magnet separator for magnetic separation. Before magnetic separation, the gap between the uniform distribution trough and the permanent magnet separator is adjusted to a suitable position, with the gap not exceeding the mesh size of the circular vibrating screen. The metallurgical slag material, after being spread and thinned by the uniform distribution trough, enters the permanent magnet separator for magnetic separation, which makes it easier to improve the magnetic separation rate. The tailings after iron removal are conveyed by belt conveyor VI to the silo or screened again. Iron-containing particles and powders are conveyed by belt conveyor VII to the silo or screened again. S6: Measurement The control system collects parameters from belt scale I, belt scale II, and belt scale III. Based on the parameters from belt scale I and belt scale II, the control system automatically calculates the crushing coefficient K1 of the metallurgical slag after secondary screening and plots the metallurgical slag crushing curve. Different metallurgical slag treatments result in different K1 values. According to the metallurgical slag crushing curve, a warning value is set. When the value falls below the warning value, the control system alarms to indicate an abnormality. The working condition of the rod mill should be checked, and the wear amount of the steel rods should be inspected. From the wear amount of the steel rods, the wear coefficient K2 of the steel rods per ton of metallurgical slag can be calculated, as well as the metallurgical slag output corresponding to the total wear amount of the steel rods. Different metallurgical slag treatments result in different K2 values. Based on the K1 and K2 values, it can be accurately determined whether the steel rods need to be replaced. The control system can calculate the content of iron-containing slag steel particles and metallurgical slag iron powder in each ton of metallurgical slag by collecting the parameters of belt scale I, belt scale II and belt scale III.

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