Dry grinding and dry separation system and method

Abstract

The invention 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 and method.The dry grinding and dry separation system 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] The present invention relates to the technical field of dry grinding and dry separation of iron ore and similar processes, and more specifically, to a dry grinding and dry separation system and method. Background Art

[0002] In the prior art, a common iron ore dry grinding and dry separation system uses a high-pressure roller mill to grind the raw ore material, and a combined screening machine to separate the material. The screening machine is used to screen the cake material extruded by the high-pressure roller mill. The combined screening machine includes screening machines with various particle sizes, and the configuration of multiple screening machines realizes step-by-step screening from coarse to fine, and finally obtains finished materials with various particle sizes.

[0003] There are some defects in using the above treatment method, that is:

[0004] Through step-by-step screening by multiple screening machines, the processing capacity of a single screening machine is relatively large; and due to the parallel arrangement of multiple screening machines, the floor area is relatively large; the fine powder is not screened in advance, and the screen meshes of each stage screening machine are easily blocked, reducing the processing capacity of the screening machine and thus reducing the production capacity. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a dry grinding and dry separation system and method;

[0006] The solution adopted by the present invention to solve the technical problem is:

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

[0008] The discharge port of the feeding conveying system is communicated with the feeding port of the roller mill;

[0009] The discharge port of the roller mill is communicated with the feeding port of the dynamic powder separator; the coarse particle material discharge port of the dynamic powder separator is communicated with the feeding port of the dry classification chamber; the oversize coarse particle discharge port of the dry classification chamber is communicated with the feeding port of the roller mill; the fine powder discharge port of the dynamic powder separator is connected to the fine powder collection and conveying system.

[0010] In some possible embodiments, the fine powder collection and conveying system includes a dust collector connected to the fine powder discharge port of the dynamic powder separator and used for dust collection, and a fine powder conveying mechanism communicated with the discharge port of the dust collector.

[0011] In some possible embodiments, the dust collector is respectively communicated with the dust generating points of the roller mill, the dynamic powder separator, and the dry classification chamber; the dust collector is also connected with an exhaust fan.

[0012] In some possible embodiments, it further includes a weighing and steady-flow bin communicated with the feeding port of the roller mill through a chute; a gate valve is arranged on the chute; the feeding port of the weighing and steady-flow bin is communicated with the discharging port of the incoming material conveying system.

[0013] In some possible embodiments, the incoming material conveying system includes a batching bin, a metering feeder, a belt conveyor and a three-way valve connected in sequence through a conveying pipeline; the three-way valve is communicated with the feeding port of the weighing and steady-flow bin through a conveying chute.

[0014] In some possible embodiments, the oversize coarse particle discharging port of the dry classification chamber is communicated with the feeding port of the weighing and steady-flow bin through a pipeline; a pipeline type iron remover and an external discharge chute of the system are arranged on the pipeline.

[0015] In some possible embodiments, an iron remover and two groups of metal detectors are arranged on the belt conveyor along the conveying direction, and the iron remover is located between the two groups of metal detectors.

[0016] In some possible embodiments, the three-way valve is provided with a feeding port A, a discharging port A and a discharging port A; the feeding port A is communicated with the discharging port of the belt conveyor; the discharging port A is communicated with the feeding port of the weighing and steady-flow bin; the discharging port A is communicated with the external discharging area.

[0017] In some possible embodiments, it further includes a lifting mechanism; the lifting mechanism is respectively communicated with the roller mill, the dynamic powder separator, the dry classification chamber and the weighing and steady-flow bin.

[0018] In some possible embodiments, the fine powder conveying mechanism includes a conveying chute communicated with the discharging port of the dust collector and a chute fan used in cooperation with the chute.

[0019] A dry grinding and dry separation method for a dry grinding and dry separation system according to the above, specifically includes the following steps:

[0020] Step S1: After the iron parts in the original ore are removed by the incoming material conveying system, it enters the roller mill, is extruded by the roller mill to form a cake, and is sent to the dynamic powder separator.

[0021] Step S2: The dynamic powder separator performs sorting treatment, and the separated coarse particle materials are conveyed to the dry classification chamber; the separated fine powder materials are conveyed to the tailing discarding process after dust collection.

[0022] Step S3: The dry classification chamber vibrates and disperses the coarse particle materials, and performs particle size classification screening through a sieve; among them, the oversize materials enter the roller mill for cyclic extrusion; the undersize materials are collected and conveyed to the magnetic separation process.

[0023] Compared with the prior art, the beneficial effects of the present invention:

[0024] Compared with the prior art, the present invention provides finished materials with various particle sizes to meet different requirements of customers for the particle size of finished products;

[0025] After being sorted by a dynamic powder separator, the coarse particle materials screened out enter the dry classification chamber, reducing the phenomenon of screen clogging in the dry classification chamber, optimizing the operating conditions of the dry classification chamber; reducing the processing capacity of the dry classification chamber;

[0026] After the fine powder screened by the dynamic powder separator of the present invention is collected by a dust collector, it is directly transported to the tailing process, simplifying the system flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the connection relationship of the present invention;

[0028] Wherein: 1, batching bin; 2, metering feeder; 3, belt conveyor; 4, metal detector; 5, magnetic separator; 6, three-way valve; 7, weighing and steady flow bin; 8, gate valve; 9, roller mill; 10, lifting mechanism; 11, dynamic powder separator; 12, dry classification chamber; 13, pipeline magnetic separator; 14, dust collector; 15, exhaust fan; 16, conveying chute; 17, chute fan; 18, conveying chute pipe; 19, pipeline. DETAILED DESCRIPTION OF THE INVENTION

[0029] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. The "first", "second" and similar words mentioned in this application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not represent a quantity limit, but represent the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In the description of the embodiments of this application, unless otherwise stated, the meaning of "multiple" is two or more. For example, multiple positioning posts refer to two or more positioning posts. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0031] As Figure 1 shown:

[0032] A dry grinding and dry separation system includes a raw material conveying system, a roller mill 9, a dynamic powder separator 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 raw material conveying system is communicated with the feed port of the roller mill 9; the discharge port of the roller mill 9 is communicated with the feed port of the dynamic powder separator 11; the coarse particle material discharge port of the dynamic powder separator 11 is communicated with the feed port of the dry classification chamber 12; the oversize coarse particle discharge port of the dry classification chamber 12 is communicated with the feed port of the roller mill 9; the fine powder discharge port of the dynamic powder separator 11 is communicated with the fine powder collection and conveying system;

[0034] The fine powder collection and conveying system is externally connected to the tailing discarding process; the undersize discharge port of the dry classification chamber 12 is externally connected to the magnetic separation process;

[0035] The raw material conveying system is used for metering the raw ore according to the ratio and removing iron parts, and then conveying it into the roller mill 9;

[0036] The raw ore enters the roller mill 9 and is extruded to form a cake; it is conveyed to the dynamic powder separator 11 and sorted by the dynamic powder separator 11; among them:

[0037] The sorted fine powder materials are collected for dust and then sent to the tailing discarding process through the fine powder collection and conveying system;

[0038] The sorted coarse particle materials are conveyed to the dry classification chamber 12; the dry classification chamber 12 vibrates and disperses the coarse particle materials, and performs particle size classification screening through the internal screen; among them, the oversize materials are returned to the roller mill 9 for extrusion again; the undersize materials are conveyed to the magnetic separation process;

[0039] In the present invention, the dynamic powder separator 11 screens and separates all the fine powder materials processed by the roller mill 9; the coarse particle materials separated by the dynamic powder separator 11 enter the dry classification chamber 12 for further processing; this will greatly reduce the processing capacity of the dry classification chamber 12 and avoid the fine powder materials entering the dry classification chamber 12 and blocking the screen of the dry classification chamber 12.

[0040] In some possible implementation manners, in order to effectively collect the dust of the fine powder materials separated by the dynamic powder separator 11 before being conveyed to the tailing discarding process;

[0041] The fine powder collection and conveying system includes a dust collector 14 connected to the fine powder discharge port of the dynamic powder separator 11 and used for dust collection, and a fine powder conveying mechanism communicated with the discharge port of the dust collector 14.

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

[0043] Specifically, the dust collector 14 is a pocket pulse dust collector, a bag filter or a cyclone separator; after the dust-containing gas is purified by the dust collector 14, it is discharged from the system by the exhaust fan 15; the number of dust collectors 14 can be set according to the on-site needs to meet the dust collection of all dust generation points.

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

[0045] In some possible embodiments, it further includes a weighing and constant flow bin 7 connected to the feeding port of the roller mill 9 through a chute; a gate valve 8 is provided on the chute; the feeding port of the weighing and constant flow bin 7 is connected to the discharging port of the incoming material conveying system.

[0046] The incoming material conveying system transports the raw ore into the weighing and constant flow bin 7. When the raw ore is in a full state in the weighing and constant flow bin 7, it is fed into the roller mill 9 oversaturated through the chute, and the material is extruded by the roller mill 9 to form a cake. The gate valve 8 provided on the chute must be opened only after the roller mill 9 is started to avoid the roller mill 9 starting with material; specifically, the gate valve 8 is a pneumatic gate valve.

[0047] In some possible embodiments, the incoming material conveying system includes a batching bin 1, a belt feeder 2, a belt conveyor 3 and a three-way valve 6 connected in sequence through a conveying pipeline; a magnetic separator 5 and a metal detector are provided on the belt conveyor 3; the three-way valve 6 is connected to the feeding port of the weighing and constant flow bin 7 through a conveying chute 18.

[0048] Specifically, each component of the raw ore is discharged from the batching bin 1 to the belt feeder 2 for metering according to the required ratio, and then fed into the weighing and constant flow bin 7 by the belt conveyor 3;

[0049] Preferably, there are two groups of metal detectors and one group of magnetic separators 5; the magnetic separator 5 is arranged between the two groups of metal detectors; during use, when the metal detector 4 on the side close to the input end of the belt conveyor 3 detects the magnetic iron parts in the raw ore, the magnetic separator 5 is started to exclude the magnetic iron parts; after the non-magnetic iron parts are detected by the metal detector 4 on the side close to 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 being damaged by the iron parts; specifically, the magnetic separator 5 is a suspended electromagnetic separator; the three-way valve 6 is a pneumatic three-way valve.

[0050] Further, the three-way valve 6 is provided with a feeding port A, a discharging port A and a discharging port A; the feeding port A is connected to the discharging port of the belt conveyor 3; the discharging port A is connected to the feeding port of the weighing and constant flow bin 7; the discharging port A is connected to the external discharging area.

[0051] In some possible embodiments, the oversize discharge opening of the dry classification chamber 12 is communicated with the feeding opening of the weighing and steady-flow bin 7 through a pipeline 19; a pipeline-type iron remover 13 and an external discharge chute of the system are arranged on the pipeline 19; specifically, the pipeline 19 is communicated with the feeding opening of the weighing and steady-flow bin 7 through a feeding chute 18;

[0052] The oversize material separated by the dry classification chamber 12 enters the pipeline 19, and the pipeline-type iron remover 13 and the external discharge chute of the system arranged on the pipeline 19 are used to remove the magnetic iron parts enriched in the system; then it is transported to the weighing and steady-flow bin 7 through the feeding chute 18, and enters the roller mill 9 through the weighing and steady-flow bin 7 and the gate valve 8 for extrusion.

[0053] In some possible embodiments, in order to effectively transport the material after the roller mill 9 to the dynamic powder separator 11 and transport the oversize material of the dry classification chamber 12 to the roller mill 9; a lifting mechanism 10 is further included; the lifting mechanism 10 is respectively communicated with the roller mill 9, the dynamic powder separator 11, the dry classification chamber 12, and the weighing and steady-flow bin 7;

[0054] The lifting mechanism 10 can be one group or two groups; specifically, it can be set according to the on-site layout;

[0055] As Figure 1 shown, the lifting mechanism 10 is two groups, one of which is communicated with the roller mill 9 and the dynamic powder separator 11; the other group is communicated with the oversize material outlet of the dry classification chamber 12 and one end of the pipeline 19 far from the feeding chute 18.

[0056] In some possible embodiments, the fine powder conveying mechanism includes a conveying chute 16 communicated with the discharge opening of the dust collector 14 and a chute fan 17 used in cooperation with the chute; the material collected by the dust collector 14 after dust collection 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 the dust-generating points of the system; the dust collector 14 is respectively communicated with the dust-generating points of the roller mill 9, the dynamic powder separator 11, the weighing and steady-flow bin 7, the lifting mechanism 10, and the dry classification chamber 12 to collect dust from the dust-generating points of the entire system.

[0058] A dry grinding and dry separation method for a dry grinding and dry separation system according to the above, specifically includes the following steps:

[0059] Step S1: After the incoming material conveying system removes the iron parts in the raw ore, it enters the roller mill 9, is extruded by the roller mill 9 to form a cake, and is sent to the dynamic powder separator 11;

[0060] After the original ore of each component is discharged from the batching bin 1 and metered by the constant rate feeder 2 according to the required ratio, it is fed into the weighing and steady flow bin 7 by the belt conveyor 3. When the original ore in the weighing and steady flow bin 7 is in a full state, it is oversaturated and fed into the high-pressure roller mill 9 through the chute, and a cake is formed after being extruded by the high-pressure roller mill 9, and then it is transported to the dynamic classifier 11;

[0061] During iron removal, when the metal detector 4 on the side close to the input end of the belt conveyor 3 detects the magnetic iron parts in the original ore, the iron remover 5 is started to remove the magnetic iron parts; after the non-magnetic iron parts are detected by the metal detector 4 on the side far 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 roll surface of the roller mill 9 from being damaged by the iron parts.

[0062] Step S2: The dynamic classifier 11 performs sorting treatment. The coarse-grained materials screened out are transported to the dry classification chamber 12; the fine powder materials screened out are transported to the tailing rejection process after dust collection;

[0063] Step S3: The dry classification chamber 12 vibrates and breaks up the coarse-grained materials. In a dispersed state, particle size classification and screening are carried out through the screen; among them, the materials on the screen are returned to the weighing and steady flow bin 7 and fed into the roll pressing and circulating extrusion; the materials under the screen are collected and transported to the magnetic separation process.

[0064] The present invention is not limited to the foregoing specific embodiments. The present invention extends to any new feature or any new combination disclosed in this specification, and any new method or process step or any new combination disclosed.

Claims

1. A dry grinding and dry separation system, characterized in that: It includes the material conveying system, roller mill, dynamic powder concentrator, dry classifying chamber, and fine powder collection and conveying system; The material outlet of the incoming material conveying system is connected to the material inlet of the roller mill; The discharge port of the roller mill is connected to the feed port of the dynamic powder selector; the coarse particle material discharge port of the dynamic powder selector is connected to the feed port of the dry classification chamber; the coarse particle discharge port on the sieve of the dry classification chamber is connected to the feed port of the roller mill; the fine powder discharge port of the dynamic powder selector is connected to the fine powder collection and conveying system.

2. The dry grinding and dry separation system according to claim 1, characterized in that: The fine powder collection and conveying system comprises a dust collector connected to the fine powder discharge port of the dynamic powder selector and used for collecting dust, and a fine powder conveying mechanism communicated with the discharge port of the dust collector.

3. A dry grinding and dry separation system according to claim 2, characterized in that: The dust collector is connected to the dust generating points of the roller mill, the dynamic powder selector and the dry classification chamber respectively; the dust collector is also connected to an exhaust fan; the fine powder conveying mechanism includes a conveying chute connected to the discharge port of the dust collector, and a chute fan used in conjunction with the chute.

4. The dry grinding and dry separation system according to claim 1, characterized in that: It also includes a weighing stabilizing flow bin connected to the feed port of the roller mill through a chute; a gate valve is arranged on the chute; the feed port of the weighing stabilizing flow bin is connected to the feed port of the incoming material conveying system.

5. The dry grinding and dry separation system according to claim 4, characterized in that: The incoming material conveying system comprises a batching bin, a quantitative feeder, a belt conveyor and a three-way valve which are sequentially connected through a conveying pipeline; the three-way valve is connected to the feed inlet of the weighing and stabilizing flow bin through a conveying chute.

6. The dry grinding and dry separation system according to claim 4, characterized in that: The coarse particle discharge port of the dry-type classification chamber is connected with the feed port of the weighing and stabilizing flow chamber through a pipeline; a pipeline-type iron remover and a system external discharge chute are arranged on the pipeline.

7. The dry grinding and dry separation system according to claim 5, characterized in that: 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 discharge port of the belt conveyor; the discharge port A is connected to the inlet of the weighing stabilizing bin; the discharge port A is connected to the external discharge area.

8. The dry grinding and dry separation system according to claim 5, characterized in that: An iron remover and two groups of metal detectors are arranged on the belt conveyor along the conveying direction, and the iron remover is located between the two groups of metal detectors.

9. A dry grinding and dry separation system according to any one of claims 4 to 8, characterized in that: It also includes a lifting mechanism; the lifting mechanism is connected with the roller mill, the dynamic powder selector, the weighing stabilizing bin, and the dry classification chamber respectively.

10. A dry grinding and dry separation method of a dry grinding and dry separation system according to any one of claims 1 to 9, characterized in that: The specific steps include: Step S1: After the iron pieces in the raw ore are removed by the incoming material conveying system, the raw ore enters the roller mill, is extruded by the roller mill to form a cake, and is sent to the dynamic powder concentrator; Step S2: The dynamic powder concentrator performs sorting processing, and the coarse particle materials screened out are transported to the dry classification chamber; the fine powder materials screened out are transported to the tailing process after dust collection; Step S3: The dry classification chamber vibrates and breaks up the coarse particles, and screens them by particle size classification through a sieve; the materials on the sieve enter the roller mill for cyclic extrusion; the materials under the sieve are collected and transported to the magnetic separation process.

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