Dry grinding and dry separation system for magnetic minerals

Abstract

The utility model relates to the technical field of grinding, and particularly discloses a dry grinding and dry separation system for magnetic minerals. The dry grinding and dry separation system comprises a pre-crushing mechanism connected with the feeding system, a secondary grinding mechanism connected with a discharge port of the pre-crushing mechanism, a screening mechanism connected with a discharge port of the secondary grinding mechanism, a winnowing system connected with the screening mechanism, and a separation system communicated with a discharge port of the winnowing system; the dust collecting system and the dry magnetic separator are connected with the sorting system. According to the utility model, superfine powder and light ore can be effectively discarded, so that the treatment load of subsequent equipment is reduced, the influence of the fine powder on dry magnetic separation is reduced, the magnetic separation efficiency is improved, and the concentrate grade is improved.

Description

Technical Field

[0001] This utility model relates to the field of grinding technology, and more specifically, to a dry grinding and dry separation system for magnetic minerals. Background Technology

[0002] In existing technologies, common dry grinding and dry separation systems for magnetic minerals such as iron ore use high-pressure roller mills for final grinding, screening machines and dynamic air classifiers for grading, and dry magnetic separation for separation to finally obtain concentrate.

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

[0004] 1. The final grinding system has a long process flow. The raw materials are generally large in particle size, while the return materials are smaller in particle size and contain a certain amount of fine powder. When the two are mixed and enter the high-pressure roller mill, the large particle size difference prevents the formation of a dense cake, which affects the extrusion effect of the high-pressure roller mill and leads to problems such as large circulation volume and unstable operation in this section of the system.

[0005] 2. The material entering the dry magnetic separator contains a considerable amount of light minerals and ultrafine powders, which affects the magnetic separation effect and reduces the grade of concentrate. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a dry grinding and dry separation system for magnetic minerals. This utility model can effectively discard ultrafine powder and light minerals, thereby reducing the processing load of subsequent equipment, reducing the impact of fine powder on dry magnetic separation, improving magnetic separation efficiency and improving concentrate grade.

[0007] The solution adopted by this utility model to solve the technical problem is:

[0008] A dry grinding and dry separation system for magnetic minerals includes a pre-crushing mechanism connected to a feeding system, a secondary grinding mechanism connected to the discharge port of the pre-crushing mechanism, a screening mechanism connected to the discharge port of the secondary grinding mechanism, an air separation system connected to the screening mechanism, a sorting system connected to the discharge port of the air separation system, a dust collection system and a dry magnetic separator connected to the sorting system.

[0009] In some possible implementations, the pre-crushing mechanism includes a roller mill connected to the outlet end of the feeding system and a transfer ore bin connected to the discharge port of the roller mill.

[0010] In some possible implementations, the screening mechanism is provided with an oversize outlet, an undersize outlet, and a feed inlet; the oversize outlet is connected to the secondary grinding mechanism via a pipe; the feed inlet is connected to the discharge outlet of the secondary grinding mechanism; and the undersize outlet is connected to the feed inlet of the air separation system.

[0011] In some possible implementations, the air separation system includes a dynamic classifier connected to the screen outlet, a dust collection device connected to the outlet of the dynamic classifier, and a fan connected to the dust collection device; the outlet of the dynamic classifier is connected to a secondary grinding mechanism.

[0012] In some possible implementations, the sorting system includes a conveying device that communicates with the discharge port of the dust collection device and conveys the material processed by the dust collection device, and a powder classifier used in conjunction with the conveying device; the powder classifier is connected to the dust collection system and the dry magnetic separator respectively.

[0013] In some possible implementations, the roller mill device and the secondary grinding mechanism are both high-pressure roller mills.

[0014] In some possible implementations, the dust collection device and dust collection system are respectively a bag dust collector, a cyclone separator, or a pulse dust collector.

[0015] In some possible implementations, the classifying device is a dynamic classifier.

[0016] A method for dry grinding and dry separation of magnetic minerals, based on the aforementioned dry grinding and dry separation system for magnetic minerals, is characterized by comprising the following steps:

[0017] Step S1: After being metered and iron-removed by the feeding system, the raw mineral material enters the pre-crushing mechanism for pre-crushing to obtain metered material A;

[0018] Step S2: Material A enters the secondary grinding mechanism for final grinding. After being extruded under high pressure, it forms a cake and enters the screening mechanism for particle size classification and screening. The coarse particles on the screen are returned to the secondary grinding mechanism for recirculation and extrusion through the screen outlet; the fine particles under the screen enter the air separation system through the under-screen outlet.

[0019] Step S3: The undersized fine particles are dispersed, sorted and separated by air in the air separation system to obtain material B and coarse particles. The coarse particles are then processed by the secondary grinding unit.

[0020] Step S4: Material B enters the sorting system for further processing to obtain ultrafine powder, light ore and material C. The ultrafine powder and light ore are treated by the dust collection system and become tailings A. Material C enters the dry magnetic separator for magnetic separation to obtain concentrate and tailings B. The concentrate, tailings A and tailings B are sent to the corresponding ore bins for storage.

[0021] In some possible implementations, in step S4, material B enters the sorting system for further processing to obtain ultrafine powder, light minerals, and material C. Specifically, material B is separated using a dynamic air classifier; the separated light minerals and ultrafine powder are discarded, and the remaining material after removing the light minerals and ultrafine powder is fed into a dry magnetic separator as material C for magnetic separation to obtain concentrate and tailings B.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] Compared with the prior art, this utility model adds a pre-crushing mechanism to crush the raw material. The crushed material has a smaller and more uniform particle size and is filled with micro-cracks, which is more conducive to subsequent grinding. With the cooperation of the secondary grinding mechanism, the subsequent return material enters the secondary grinding mechanism and mixes with the material crushed by the pre-crushing mechanism. The particle size difference is small, thus forming a dense cake and reducing the circulation volume.

[0024] This invention, by setting up a powder separation device, allows for the re-separation of materials after air separation in the air separation system. The separated ultrafine powder and light minerals are discarded as waste, which reduces the processing load of subsequent equipment, reduces the impact of fine powder on dry magnetic separation, improves magnetic separation efficiency, and increases concentrate grade. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] The components include: 1. Pre-crushing mechanism; 11. Roller mill device; 12. Transfer ore bin; 2. Secondary grinding mechanism; 3. Screening mechanism; 4. Air separation system; 41. Dynamic air classifier; 42. Dust collection system; 43. Fan; 5. Separation system; 51. Conveying equipment; 52. Air classifier; 6. Dust collection device; 60. Ventilation fan; 7. Dry magnetic separator. Detailed Implementation

[0027] 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.

[0028] The present invention will now be described in detail.

[0029] like Figure 1 As shown:

[0030] A dry grinding and dry separation system for magnetic minerals includes a pre-grinding mechanism 1 connected to a feeding system, a secondary grinding mechanism 2 connected to the discharge port of the pre-grinding mechanism 1, a screening mechanism 3 connected to the discharge port of the secondary grinding mechanism 2, an air separation system 4 connected to the screening mechanism 3, a separation system 5 connected to the discharge port of the air separation system 4, a dust collection system 6 connected to the separation system 5, and a dry magnetic separator 7.

[0031] When in use, the raw ore is weighed and de-ironed by the feeding system and then fed into the pre-powdering mechanism. After being crushed by the pre-crushing mechanism 1, material A with smaller particle size and full of microcracks is obtained, which is more conducive to subsequent grinding.

[0032] Material A, after being crushed by the pre-crushing mechanism 1, is metered and sent to the secondary grinding mechanism 2 for final grinding.

[0033] In the final grinding stage, material A is compressed under high pressure to form a cake, which is then conveyed to the screening mechanism 3.

[0034] The screening mechanism 3 vibrates and disperses the crushed material A again to classify and screen the particle size, obtaining coarse particles on the screen and fine particles on the screen; the coarse particles on the screen are returned to the secondary grinding mechanism 2 for recycling and extrusion; the fine particles on the screen are fed into the subsequent air classification system 4.

[0035] The undersized fine particles are processed by the air separation system 4 to separate coarse and fine particles. The coarse particles are then fed into the secondary grinding unit 2 for further cyclic extrusion. The fine particles are in the air separation system 4. After material and air separation, material B is obtained and sent to the sorting system 5.

[0036] Material B is further processed in the sorting system 5 to obtain ultrafine powder, light ore and material C. The ultrafine powder and light ore are processed by the dust collection system 6 and become tailings A. Material C enters the dry magnetic separator 7 for magnetic separation to obtain concentrate and tailings B. Tailings A, concentrate and tailings B are sent to the corresponding ore bins for storage.

[0037] This invention achieves two-stage grinding through a pre-grinding mechanism 1 and a secondary grinding mechanism 2. The material pulverized by the pre-grinding mechanism 1 is mixed with the subsequent return material in the secondary grinding mechanism 2. The small particle size difference of the mixture results in a high density of the formed cake, reducing the circulation volume and making the entire system operate more smoothly. By setting up a sorting system 5 to achieve reverse enrichment, light ore and ultrafine powder are disposed of as waste, which can reduce the processing load of subsequent equipment, reduce the impact of ultrafine powder and light ore on dry magnetic separation, improve magnetic separation efficiency, and improve concentrate grade.

[0038] In some possible implementations, in order to effectively crush and meter the iron-removed raw ore material through the pre-crushing mechanism 1, so that the crushed material A is conducive to subsequent grinding, the pre-crushing mechanism 1 includes a roller mill device 11 connected to the outlet end of the feeding system and used for crushing the raw ore material, and a transfer ore bin 12 connected to the discharge port of the roller mill device 11; the crushed material A enters the transfer ore bin 12, is metered, and then enters the secondary grinding mechanism 2 for secondary grinding.

[0039] In some possible implementations, the screening mechanism 3 is provided with an oversize outlet, an undersize outlet, and a feed inlet; the oversize outlet is connected to the secondary grinding mechanism 2 via a pipe; the feed inlet is connected to the discharge outlet of the secondary grinding mechanism 2; and the undersize outlet is connected to the feed inlet of the air separation system 4.

[0040] Specifically, the screening mechanism 3 is equipped with a screen, which divides the interior of the screening mechanism 3 into bin A, which has an oversize material outlet, and bin B, which has an undersize material outlet. After screening by the screening mechanism 3, the coarse particles on the screen located in bin A are sent to the secondary grinding mechanism 2 through pipe 1 for grinding. The fine particles on the screen located in bin B are fed into the air separation system 4.

[0041] In some possible implementations, the air separation system 4 includes a dynamic classifier 41 connected to the screen outlet, a dust collection device 42 connected to the air outlet of the dynamic classifier 41, and a fan 43 connected to the dust collection device 42; the external discharge port of the dynamic classifier 41 is connected to the secondary grinding mechanism 2.

[0042] Specifically, the fan 43 provides power support for the powder classification of the dynamic powder classifier 41 and the dust collection device 42;

[0043] Fine particles that pass through the screen enter the dynamic classifier 41, where they are dispersed and separated by airflow. The separated coarse particles are discharged from the outer outlet at the bottom of the dynamic classifier 41 and returned to the secondary grinding mechanism 2 for repeated extrusion.

[0044] The separated fine particles are carried by the airflow from the outlet of the dynamic classifier 41 into the dust collection device 42. After the material and gas are separated in the dust collection device 42, material B is obtained. Material B is discharged from the outlet of the dust collection device 42 and enters the sorting system 5. The gas purified by the dust collection device 42 is discharged into the atmosphere by the fan 43.

[0045] In some possible implementations, the sorting system 5 includes a conveying device 51 that communicates with the discharge port of the dust collection device 42 and conveys the material B processed by the dust collection device 42, and a powder classifier 52 used in conjunction with the conveying device 51; the powder classifier 52 is connected to the dust collection system 6 and the dry magnetic separator 7 respectively.

[0046] Material B discharged from the outlet of dust collection device 42 is conveyed by conveyor 51 to powder classifier 52 for sorting, and the sorted materials include ultrafine powder, light minerals, and material C; among which:

[0047] The separated ultrafine powder and light ore are carried into the dust collection system 6 by the airflow from the air outlet of the powder classifier 52. After the material and gas are separated in the dust collection system 6, they are discharged from the outlet of the dust collection system 6 as tailings A. The gas purified by the dust collection system 6 is discharged into the atmosphere by the exhaust fan 60 connected to the dust collection system 6.

[0048] The material C separated by the powder classifier 52 is discharged from the discharge port of the powder classifier 52 and fed into the dry magnetic separator 7 for magnetic separation. The output of the dry magnetic separator 7 is divided into two types: concentrate and tailings B, which are sent to the corresponding ore bins for storage.

[0049] In some possible implementations, the roller mill device 11 and the secondary grinding mechanism 2 are both high-pressure roller mills in the prior art.

[0050] In some possible implementations, the dust collection device 42 and the dust collection system 6 are respectively bag dust collectors, cyclone separators or pulse dust collectors in the prior art.

[0051] In some possible implementations, the classifying device 52 is a dynamic classifier in the prior art.

[0052] Furthermore, both the feeding system 1 and the conveying equipment 51 include belt conveyors; wherein, a metal detector and an iron removal device are installed on the belt conveyor of the feeding system 1, thereby realizing the conveying and iron removal of material A.

[0053] A method for dry grinding and dry separation of magnetic minerals, based on the aforementioned dry grinding and dry separation system for magnetic minerals, specifically includes the following steps:

[0054] Step S1: After being metered and iron-removed by the feeding system, the raw mineral material enters the pre-crushing mechanism 1 for pre-crushing to obtain metered material A;

[0055] Step S2: Material A enters the secondary grinding unit 2 for final grinding. After being extruded under high pressure, it forms a cake and enters the screening unit 3 for screening. The cake is then classified by particle size through the screen in the screening unit 3. The coarse particles on the screen are returned to the secondary grinding unit 2 for recirculation and extrusion through the screen outlet. The fine particles under the screen enter the air separation system 4 through the under-screen outlet.

[0056] Step S3: The fine particles under the screen are dispersed, sorted and separated by air in the air separation system 4 to obtain material B and coarse particles. The coarse particles enter the secondary grinding mechanism 2 for cyclic extrusion, and material B enters the sorting system 5.

[0057] Step S4: Material B entering the sorting system 5 is processed again to obtain ultrafine powder, light minerals, and material C, wherein:

[0058] The ultrafine powder and light ore are treated by dust collection system 6 and then used as tailings A;

[0059] Material C enters the dry magnetic separator 7 for magnetic separation to obtain concentrate and tailings B. Tailings A, concentrate, and tailings B are respectively sent to the corresponding ore bins for storage.

[0060] In some possible implementations, in step S4, material B enters the sorting system 5 for further processing to obtain ultrafine powder, light minerals, and material C. Specifically, a dynamic air classifier is used to separate material B, wherein the light minerals and ultrafine powder are separated and discarded, and the remaining material after removing the light minerals and ultrafine powder is fed into the dry magnetic separator 7 as material C for magnetic separation.

[0061] 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 dry separation system of magnetic minerals, characterized by, It includes a pre-crushing mechanism connected to a feeding system, a secondary grinding mechanism connected to the discharge port of the pre-crushing mechanism, a screening mechanism connected to the discharge port of the secondary grinding mechanism, an air separation system connected to the screening mechanism, a sorting system connected to the discharge port of the air separation system, and a dust collection system and a dry magnetic separator connected to the sorting system.

2. The dry grinding and dry separation system for magnetic minerals according to claim 1, characterized in that, The pre-crushing mechanism includes a roller mill connected to the outlet end of the feeding system and a transfer ore bin connected to the discharge port of the roller mill.

3. A dry grinding dry separation system of magnetic minerals according to claim 1, characterized in that, The screening mechanism is provided with an oversize outlet, an undersize outlet, and a feed inlet; the oversize outlet is connected to the secondary grinding mechanism via a pipeline; the feed inlet is connected to the discharge outlet of the secondary grinding mechanism; and the undersize outlet is connected to the feed inlet of the air separation system.

4. The dry grinding and dry separation system for magnetic minerals according to claim 1, characterized in that, The air separation system includes a dynamic air classifier connected to the screen outlet, a dust collection device connected to the air outlet of the dynamic air classifier, and a fan connected to the dust collection device; the external discharge port of the dynamic air classifier is connected to the secondary grinding mechanism.

5. The dry grinding and dry separation system for magnetic minerals according to claim 1, characterized in that, The sorting system includes a conveying device that is connected to the discharge port of the dust collection device and conveys the material processed by the dust collection device, and a powder sorting device used in conjunction with the conveying device; the powder sorting device is connected to the dust collection system and the dry magnetic separator respectively.

6. The dry grinding and dry separation system for magnetic minerals according to claim 2, characterized in that, Both the roller mill device and the secondary grinding mechanism are high-pressure roller mills.

7. The dry grinding and dry separation system for magnetic minerals according to claim 4, characterized in that, The dust collection device and dust collection system are respectively a bag dust collector, a cyclone separator or a pulse dust collector.

8. The dry grinding and dry separation system for magnetic minerals according to claim 5, characterized in that, The powder classifier is a dynamic powder classifier.

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