Dry grinding and dry separation system

Abstract

The utility model relates to the technical field of dry grinding and dry separation of iron ore and similar processes, and particularly discloses a dry grinding and dry separation system which comprises an incoming material conveying system, a roller mill, a dynamic powder concentrator, a dry classification cabin and a fine powder collecting and conveying system. A discharging hole of the supplied material conveying system is communicated with a feeding hole of the roller mill; a discharging hole of the roller mill is communicated with a feeding hole of the dynamic powder concentrator; a coarse particle material outlet of the dynamic powder concentrator is communicated with a material inlet of the dry type grading cabin; an oversize coarse particle discharging opening of the dry type grading cabin is communicated with a feeding opening of the roller mill; and a fine powder discharge hole of the dynamic powder concentrator is communicated with the fine powder collecting and conveying system. Finished product materials with various particle sizes can be provided, and the requirements of customers for different finished product particle sizes are met; fine powder screened by the dynamic powder concentrator is collected by a dust collector and then is directly conveyed to a tailing discarding procedure, so that the handling capacity of the dry classification cabin is reduced; the use condition of the dry-type grading cabin is optimized, and the system flow is simplified.

Description

Technical Field

[0001] This utility model relates to the field of dry grinding and dry beneficiation technology for iron ore and similar processes, and more specifically, to a dry grinding and dry beneficiation system. Background Technology

[0002] In the existing technology, common iron ore dry grinding and dry separation systems use high-pressure roller mills to grind raw ore materials and combined screening machines to separate the materials. The screening machines are used to screen the material cake extruded by the high-pressure roller mills. The combined screening machines include screening machines of various particle sizes. The configuration of multiple screening machines realizes step-by-step screening from coarse to fine, and finally obtains finished materials of various particle sizes.

[0003] The above processing method has some drawbacks, namely:

[0004] The process involves multiple screening machines in stages, resulting in a large throughput per machine. Furthermore, the parallel arrangement of multiple screening machines requires a large area. Since fine powder is not pre-screened, the screens of each screening machine are prone to clogging, reducing the throughput of the screening machine and thus lowering the production capacity. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a dry grinding and dry separation system;

[0006] The solution adopted by this utility model to solve the technical problem is:

[0007] A dry grinding and dry separation system includes a material conveying system, a roller mill, a dynamic classifier, a dry classification chamber, and a fine powder collection and conveying system;

[0008] The discharge port of the material conveying system is connected to the inlet of the roller mill;

[0009] The discharge port of the roller mill is connected to the inlet of the dynamic classifier; the coarse particle discharge port of the dynamic classifier is connected to the inlet of the dry classification chamber; the coarse particle discharge port on the screen of the dry classification chamber is connected to the inlet of the roller mill; and the fine powder discharge port of the dynamic classifier is connected to the fine powder collection and conveying system.

[0010] In some possible implementations, the fine powder collection and conveying system includes a dust collector connected to the fine powder outlet of a dynamic classifier for dust collection, and a fine powder conveying mechanism connected to the outlet of the dust collector.

[0011] In some possible implementations, the dust collector is connected to the dust emission points of the roller mill, dynamic classifier, and dry classification chamber, respectively; the dust collector is also connected to an exhaust fan.

[0012] In some possible implementations, a weighing and stabilizing chamber is also included, which is connected to the feed inlet of the roller mill via a chute; a gate valve is provided on the chute; and the feed inlet of the weighing and stabilizing chamber is connected to the discharge outlet of the incoming material conveying system.

[0013] In some possible implementations, the material conveying system includes a batching bin, a quantitative feeder, a belt conveyor, and a three-way valve connected in sequence via a conveying pipe; the three-way valve is connected to the inlet of the weighing and stabilizing bin via a conveying chute.

[0014] In some possible implementations, the coarse particle discharge port of the dry grading chamber is connected to the inlet of the weighing and stabilizing silo via a pipeline; a pipeline-type iron separator and a system external discharge chute are installed on the pipeline.

[0015] In some possible implementations, the belt conveyor is provided with a magnetic separator and two sets of metal detectors along the conveying direction, with the magnetic separator located between the two sets of metal detectors.

[0016] In some possible implementations, the three-way valve is provided with an inlet A, an outlet A, and a discharge port A; the inlet A is connected to the outlet of the belt conveyor; the outlet A is connected to the inlet of the weighing and stabilizing silo; and the discharge port A is connected to the external discharge area.

[0017] In some possible implementations, a lifting mechanism is also included; the lifting mechanism is connected to the roller mill, dynamic classifier, dry grading chamber, and weighing and stabilizing chamber respectively.

[0018] In some possible implementations, the fine powder conveying mechanism includes a conveying chute connected to the dust collector outlet and a chute fan used in conjunction with the chute.

[0019] A dry grinding and dry separation method according to the above-described dry grinding and dry separation system specifically includes the following steps:

[0020] Step S1: After the raw ore is de-iron from the raw ore by the infeed conveying system, it enters the roller mill, is squeezed by the roller mill to form a cake, and is sent to the dynamic classifier.

[0021] Step S2: The dynamic classifier performs sorting processing. The coarse particles screened out are conveyed to the dry grading chamber; the fine powder screened out is conveyed to the tailing process after dust collection.

[0022] Step S3: The dry grading chamber vibrates and disperses coarse particles, and then classifies and screens them by particle size through a screen. The material on the screen enters the roller mill for cyclic extrusion, while the material under the screen is collected and transported to the magnetic separation process.

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] Compared with the prior art, this utility model provides finished materials with various particle sizes to meet customers' different finished product particle size requirements;

[0025] After being sorted by a dynamic air classifier, the coarse particles screened out by this invention are fed into a dry classification chamber, which reduces the phenomenon of screen clogging in the dry classification chamber, optimizes the working conditions of the dry classification chamber, and reduces the throughput of the dry classification chamber.

[0026] The fine powder screened by the dynamic powder classifier is collected by the dust collector and directly transported to the tailing process, simplifying the system process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the connection relationship of this utility model;

[0028] The components include: 1. Batching bin; 2. Quantitative feeder; 3. Belt conveyor; 4. Metal detector; 5. Iron separator; 6. Three-way valve; 7. Weighing and stabilizing bin; 8. Gate valve; 9. Roller mill; 10. Lifting mechanism; 11. Dynamic air classifier; 12. Dry classification chamber; 13. Pipeline iron separator; 14. Dust collector; 15. Exhaust fan; 16. Conveying chute; 17. Chassis fan; 18. Conveying chute; 19. Pipeline. Detailed Implementation

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] The present invention will now be described in detail.

[0031] like Figure 1 As shown:

[0032] A dry grinding and dry separation system includes a material conveying system, a roller mill 9, a dynamic classifier 11, a dry classification chamber 12, and a fine powder collection and conveying system; the roller mill 9 is a high-pressure roller mill 9.

[0033] The discharge port of the material conveying system is connected to the inlet of the roller mill 9; the discharge port of the roller mill 9 is connected to the inlet of the dynamic classifier 11; the coarse particle discharge port of the dynamic classifier 11 is connected to the inlet of the dry classification chamber 12; the coarse particle discharge port of the dry classification chamber 12 is connected to the inlet of the roller mill 9; and the fine powder discharge port of the dynamic classifier 11 is connected to the fine powder collection and conveying system.

[0034] The fine powder collection and conveying system is connected to an external tailings process; the undersize discharge port of the dry grading chamber 12 is connected to an external magnetic separation process.

[0035] The incoming material conveying system is used to measure the raw ore according to the proportion and remove iron parts, and then convey it to the roller mill 9;

[0036] The raw ore enters the roller mill 9 and is compressed into a cake; it is then conveyed to the dynamic classifier 11 for separation; wherein:

[0037] The separated fine powder material is collected for dust and then sent to the finishing process through a fine powder collection and conveying system.

[0038] The separated coarse particles are conveyed to the dry grading chamber 12; the dry grading chamber 12 vibrates and disperses the coarse particles, and classifies and screens them by particle size through the internal screen; the material oversizes is returned to the roller mill 9 for further extrusion; the material undersizes is conveyed to the magnetic separation process.

[0039] This invention uses a dynamic classifier 11 to screen and separate the fine powder material processed by the roller mill 9; the coarse particles separated by the dynamic classifier 11 are then processed again in the dry classification chamber 12; this greatly reduces the throughput of the dry classification chamber 12 and prevents fine powder material from entering the dry classification chamber 12 and clogging the screen.

[0040] In some possible implementations, in order to effectively achieve dust collection of fine powder materials sorted by the dynamic classifier 11 before conveying them to the tailing process;

[0041] The fine powder collection and conveying system includes a dust collector 14 connected to the fine powder outlet of the dynamic classifier 11 and used for dust collection, and a fine powder conveying mechanism connected to the outlet of the dust collector 14.

[0042] Furthermore, in order to effectively power the entire system, the dust collector 14 is also connected to an exhaust fan 15.

[0043] Specifically, the dust collector 14 is a pulse jet dust collector, a bag filter, or a cyclone separator; the dust-laden gas is purified by the dust collector 14 and then discharged from the system by the exhaust fan 15; the number of dust collectors 14 can be set according to the needs of the site, as long as the dust collection needs to be met at all dust-generating points.

[0044] The exhaust fan 15 provides power to the entire air separation system. Part of the airflow is discharged to the atmosphere through the exhaust pipe connected to the exhaust fan 15, and the other part of the airflow is circulated back to the air inlet of the dynamic air separator 11 and enters the dynamic air separator 11 to air separate the materials. The airflow carries the separated fine powder materials into the dust collector 14 for fine powder collection.

[0045] In some possible implementations, a weighing and stabilizing chamber 7 is also included, which is connected to the feed inlet of the roller mill 9 via a chute; a gate valve 8 is provided on the chute; and the feed inlet of the weighing and stabilizing chamber 7 is connected to the discharge outlet of the material conveying system.

[0046] The material conveying system transports the raw ore to the weighing and stabilizing bin 7. Once the bin is full, the ore is fed into the roller mill 9 via a chute. The material is then compressed by the roller mill 9 to form a cake. A gate valve 8 installed on the chute can only be opened to release material after the roller mill 9 has started, preventing the roller mill 9 from starting with material on it. Specifically, the gate valve 8 is a pneumatic gate valve.

[0047] In some possible implementations, the material conveying system includes a batching bin 1, a quantitative feeder 2, a belt conveyor 3, and a three-way valve 6 connected in sequence via a conveying pipe; the belt conveyor 3 is equipped with an iron remover 5 and a metal detector; the three-way valve 6 is connected to the inlet of the weighing and stabilizing bin 7 via a conveying chute 18.

[0048] Specifically, the raw ore components are discharged from the batching bin 1 to the quantitative feeder 2 and metered according to the required proportions. Then, they are fed into the weighing and stabilizing bin 7 by the belt conveyor 3.

[0049] Preferably, there are two sets of metal detectors and one set of iron separators 5; the iron separator 5 is placed between the two sets of metal detectors; in use, when the metal detector 4 near the input end of the belt conveyor 3 detects magnetic iron parts in the raw ore, the iron separator 5 is activated to remove the magnetic iron parts; after non-magnetic iron parts are detected by the metal detector 4 near the discharge port of the belt conveyor 3, they are discharged by the three-way valve 6 to protect the roller surface of the roller mill 9 from damage by iron parts; specifically, the iron separator 5 is a suspended electromagnetic iron separator; the three-way valve 6 is a pneumatic three-way valve.

[0050] Furthermore, the three-way valve 6 is provided with an inlet A, an outlet A, and a discharge port A; the inlet A is connected to the outlet of the belt conveyor 3; the outlet A is connected to the inlet of the weighing and stabilizing silo 7; and the discharge port A is connected to the external discharge area.

[0051] In some possible implementations, the coarse particle discharge port of the dry grading chamber 12 is connected to the inlet of the weighing and stabilizing chamber 7 via a pipe 19; a pipe-type iron separator 13 and a system external discharge chute are provided on the pipe 19; specifically, the pipe 19 is connected to the inlet of the weighing and stabilizing chamber 7 via a conveying chute 18.

[0052] The coarse particles separated by the dry grading chamber 12 enter the pipeline 19 and pass through the pipeline-type iron remover 13 and the system external discharge chute installed on the pipeline 19 to remove the magnetic iron parts enriched in the system. Then, it is transported to the weighing and stabilizing chamber 7 through the conveying chute 18, and after passing through the weighing and stabilizing chamber 7 and the gate valve 8, it enters the roller mill 9 for extrusion.

[0053] In some possible implementations, in order to effectively transport the material after the roller mill 9 to the dynamic classifier 11 and the screen material of the dry classification chamber 12 to the roller mill 9, a lifting mechanism 10 is also included; the lifting mechanism 10 is connected to the roller mill 9, the dynamic classifier 11, the dry classification chamber 12, and the weighing and stabilizing chamber 7 respectively.

[0054] The lifting mechanism 10 can be one or two sets; the specific configuration can be determined according to the site layout.

[0055] like Figure 1 As shown, the lifting mechanism 10 consists of two sets, one of which is connected to the roller mill 9 and the dynamic classifier 11; the other set is connected to the screen outlet of the dry grading chamber 12 and the end of the pipe 19 away from the conveying chute 18.

[0056] In some possible implementations, the fine powder conveying mechanism includes a conveying chute 16 connected to the discharge port of the dust collector 14, and a chute fan 17 used in conjunction with the chute; the material collected by the dust collector 14 is conveyed to the tailing process through the cooperation of the conveying chute 16 and the chute fan 17.

[0057] Furthermore, in order to effectively collect dust from all dust-generating points in the system, the dust collector 14 is connected to the dust-generating points of the roller mill 9, the dynamic classifier 11, the weighing and stabilizing chamber 7, the lifting mechanism 10, and the dry classification chamber 12, respectively, so as to collect dust from all dust-generating points in the entire system.

[0058] A dry grinding and dry separation method according to the above-described dry grinding and dry separation system specifically includes the following steps:

[0059] Step S1: After the raw ore is removed from the iron parts by the incoming material conveying system, it enters the roller mill 9, is squeezed by the roller mill 9 to form a cake, and is sent to the dynamic classifier 11;

[0060] Each component of raw ore is discharged from the batching bin 1 to the quantitative feeder 2 and metered according to the required proportions. Then, it is fed into the weighing and stabilizing bin 7 by the belt conveyor 3. The raw ore in the weighing and stabilizing bin 7 is fed into the high pressure roller mill 9 through the chute under the state of being full. The high pressure roller mill 9 squeezes the raw ore into a cake and then conveys it to the dynamic classifier 11.

[0061] During iron removal, when the metal detector 4 on the side near the input end of the belt conveyor 3 detects magnetic iron parts in the raw ore, the iron remover 5 is activated to remove the magnetic iron parts; after non-magnetic iron parts are detected by the metal detector 4 on the side away from the input end of the belt conveyor 3, they are discharged from the system by the pneumatic three-way valve 6 to protect the roller surface of the roller mill 9 from damage by iron parts.

[0062] Step S2: The dynamic classifier 11 performs sorting processing, and the coarse particles screened out are conveyed to the dry classification chamber 12; the fine powder screened out is conveyed to the tailing process after dust collection.

[0063] Step S3: The dry grading chamber 12 vibrates and disperses the coarse particles. In the dispersed state, the particles are classified and screened by a screen. The material over the screen is returned to the weighing and stabilizing chamber 7 and fed into the roller press for cyclic extrusion. The material under the screen is collected and transported to the magnetic separation process.

[0064] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A dry grinding and dry separation system, characterized in that, This includes a material conveying system, a roller mill, a dynamic classifier, a dry classification chamber, and a fine powder collection and conveying system; The discharge port of the material conveying system is connected to the inlet of the roller mill; The discharge port of the roller mill is connected to the inlet of the dynamic classifier; the coarse particle discharge port of the dynamic classifier is connected to the inlet of the dry classification chamber; the coarse particle discharge port on the screen of the dry classification chamber is connected to the inlet of the roller mill; and the fine powder discharge port of the dynamic classifier is connected to the fine powder collection and conveying system.

2. A dry milling dry separation system according to claim 1, wherein, The fine powder collection and conveying system includes a dust collector connected to the fine powder outlet of the dynamic classifier and used for dust collection, and a fine powder conveying mechanism connected to the outlet of the dust collector.

3. A dry milling dry separation system according to claim 2, wherein, The dust collector is connected to the dust emission points of the roller mill, dynamic classifier, and dry grading chamber, respectively; the dust collector is also connected to an exhaust fan.

4. A dry milling dry separation system according to claim 2, wherein, The fine powder conveying mechanism includes a conveying chute connected to the dust collector outlet, and a chute fan used in conjunction with the chute.

5. A dry milling dry separation system according to claim 1, wherein, It also includes a weighing and stabilizing silo connected to the feed inlet of the roller mill via a chute; a gate valve is installed on the chute; and the feed inlet of the weighing and stabilizing silo is connected to the discharge outlet of the incoming material conveying system.

6. A dry milling dry separation system according to claim 5, wherein, The material conveying system includes a batching bin, a quantitative feeder, a belt conveyor, and a three-way valve connected in sequence through a conveying pipeline; the three-way valve is connected to the inlet of the weighing and stabilizing bin through a conveying chute.

7. A dry milling dry separation system according to claim 5, wherein, The coarse particle discharge port of the dry grading chamber is connected to the inlet of the weighing and stabilizing silo via a pipeline; a pipeline-type iron separator and a system external discharge chute are installed on the pipeline.

8. A dry milling dry separation system according to claim 6, wherein, The three-way valve is provided with an inlet A, an outlet A, and a discharge port A; the inlet A is connected to the outlet of the belt conveyor; the outlet A is connected to the inlet of the weighing and stabilizing silo; and the discharge port A is connected to the external discharge area.

9. A dry milling dry separation system according to claim 6, wherein, The belt conveyor is equipped with an iron remover and two sets of metal detectors along the conveying direction, with the iron remover located between the two sets of metal detectors.

10. A dry milling dry separation system according to any one of claims 5 to 9, wherein, It also includes a lifting mechanism; the lifting mechanism is connected to the roller mill, dynamic classifier, weighing and stabilizing chamber, and dry classification chamber respectively.

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