Middling coal fine separation process, middling coal fine separation equipment and coal separation system

Abstract

The invention relates to the technical field of middling coal recleaning, in particular to a middling coal fine separation process, middling coal fine separation equipment and a coal separation system. The middling coal fine separation technology is used for middling coal re-separation, a middling coal raw material comes from a raw coal separation system, and the middling coal raw material contains a middling coal blending medium liquid; the middling coal fine separation technology comprises the steps that medium drainage treatment is conducted on middling coal obtained by a raw coal separation system, and recleaning middling coal and middling coal medium blending liquid are obtained; mixing a clean coal blending medium liquid obtained by a raw coal separation system with a middling coal blending medium liquid to prepare a middling coal re-separation blending medium liquid; and the recleaning middling coal and the middling coal recleaning combination medium liquid are mixed and conveyed to a sorting device to be sorted, and concentrate products and tailing products are obtained. The middling coal fine separation technology and the raw coal separation system are combined to recover the middling coal products of the raw coal separation system, and the middling coal products of the raw coal separation system are recovered, so that scarce coal resources are fully utilized and protected, and huge economic benefits are created.

Description

Technical Field

[0001] The present invention relates to the technical field of medium coal reselection, and in particular to a medium coal fine sorting process, medium coal fine sorting equipment and a coal sorting system. Background Art

[0002] Coking coal is an indispensable raw material in the coking industry and the steel industry. At present, a large amount of medium coal produced during the coking coal washing process is directly sold as thermal coal, and its potential value is not fully utilized, resulting in serious waste of resources. In view of this, the present invention proposes a medium coal fine sorting process, medium coal fine sorting equipment and coal sorting system to re-select medium coal and recover clean coal. Summary of the invention

[0003] The main purpose of the present invention is to propose a medium coal fine sorting process for medium coal re-selection to recover clean coal and improve economic benefits; the present invention also proposes a medium coal fine sorting equipment using the above medium coal fine sorting process, and a coal sorting system including the above medium coal fine sorting equipment.

[0004] In order to achieve the above-mentioned object, an embodiment of the present invention provides a medium coal fine separation process for medium coal re-selection, wherein the medium coal raw material comes from a raw coal separation system, and the medium coal raw material contains medium coal medium liquid; the medium coal fine separation process comprises the following steps: The medium coal obtained from the raw coal sorting system is de-intermediated to obtain re-sorted medium coal and medium coal mixed liquid; The clean coal mixed medium liquid obtained from the raw coal separation system is mixed with the medium liquid of the medium coal to prepare the medium liquid of the medium coal re-separation; The reselected medium coal and the medium coal reselection liquid are mixed and transported to a separation device for separation to obtain concentrate products and tailings products.

[0005] Furthermore, the step of removing the medium coal obtained by the raw coal sorting system also includes: The medium coal obtained by the raw coal sorting system is graded to obtain first medium coal and second medium coal, wherein the particle size of the first medium coal is larger than that of the second medium coal; The first medium coal is disintegrated and crushed to obtain the third medium coal; The second medium coal is de-mediumized to obtain medium liquid for medium separation; The second medium coal after de-mediation is mixed with the third medium coal to obtain the re-selected medium coal.

[0006] Further, the step of mixing the reselected coal and the medium liquid for reselection of the coal and conveying them to a separation device for separation to obtain a concentrate product and a tailings product further comprises the following steps: Transport the concentrate products to the raw coal sorting system for de-mediation and dehydration; The tailings products are transported to the raw coal sorting system for de-mediation and dehydration.

[0007] Furthermore, the step of mixing the clean coal mixed medium liquid obtained from the raw coal sorting system with the medium coal mixed medium liquid to prepare the medium coal re-sorting mixed medium liquid also includes: Part of the medium coal mixed liquid is transported to the raw coal sorting system for standby use, and the remaining medium coal mixed liquid is mixed with the clean coal mixed liquid diverted from the raw coal sorting system to prepare the medium coal re-selection mixed liquid.

[0008] Another embodiment of the present invention further provides a medium coal fine sorting device, which adopts the medium coal fine sorting process described in any of the above embodiments; the medium coal fine sorting device comprises: a screening device, a sorting device, a mixing chamber, a mixing chamber and a conveying system; The screening device is arranged on the shock-absorbing bracket, and comprises a first screen assembly, which is used to remove the medium coal obtained by the raw coal sorting system, the material discharge end of the first screen assembly on the screen is connected to the mixing chamber, and the material discharge end of the first screen assembly under the screen is connected to the mixing chamber; The conveying system is used to convey the material in the mixing chamber and the clean coal mixing liquid to the mixing chamber, and is used to convey the material in the mixing chamber to the sorting device.

[0009] Furthermore, it also includes a crushing device; the screening device also includes a second screen assembly; The second screen assembly and the first screen assembly are arranged in sequence, and the screening particle size of the second screen assembly is larger than the screening particle size of the first screen assembly; the discharge end of the screened material of the second screen assembly is connected to the crushing device, and the discharge end of the crushing device is connected to the mixing chamber.

[0010] Furthermore, it also includes a concentrate chamber for storing the concentrate product of the sorting device and a tailing chamber for storing the tailing product of the sorting device.

[0011] Furthermore, it also includes a working pool; a plurality of partitions are arranged in the working pool, and the working pool is separated into the mixing chamber, the combining chamber, the concentrate chamber and the tailings chamber by the partitions.

[0012] Furthermore, the conveying system is also used to convey the materials in the concentrate chamber and the materials in the tailings pond to the raw coal sorting system for recovery.

[0013] The third aspect of the present invention also provides a coal sorting system, including the medium coal fine sorting equipment described in any of the above embodiments.

[0014] Beneficial effects of the present invention: The invention provides a medium coal fine sorting process for medium coal re-selection. The medium coal raw material comes from a raw coal sorting system, and the medium coal raw material contains medium coal mixed medium liquid. The medium coal fine sorting process comprises the following steps: removing the medium coal obtained from the raw coal sorting system to obtain medium coal for re-selection and medium coal mixed medium liquid; mixing the fine coal mixed medium liquid obtained from the raw coal sorting system with the medium coal mixed medium liquid to prepare medium coal re-selection mixed medium liquid; mixing the re-selected medium coal and the medium coal re-selection mixed medium liquid and conveying them to a sorting device for sorting to obtain a concentrate product and a tailings product.

[0015] The medium coal fine sorting process is combined with the raw coal sorting system to recover the medium coal products from the raw coal sorting system. The medium coal re-selection liquid required for recovering the medium coal products also comes from the raw coal sorting system. By recovering the medium coal products from the raw coal sorting system, the scarce coal resources are fully utilized and protected, creating huge economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A process flow chart of a medium coal fine separation process provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of a medium coal fine separation device provided in an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a working pool provided in an embodiment of the present invention.

[0017] Icons: 1-screening device; 2-sorting device; 3-crushing device; 4-working pool; 41-mixing chamber; 42-concentrate chamber; 43-tailing chamber; 44-combining chamber; 45-partition; 46-first mounting piece; 47-second mounting piece; 51-first conveying pipeline; 52-first conveying pump; 53-second conveying pipeline; 54-second conveying pump; 55-third conveying pipeline; 56-third conveying pump; 57-fourth conveying pump; 58-fourth conveying pipeline. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figure 1 As shown, an embodiment of the present invention provides a medium coal fine separation process for medium coal re-selection, wherein the medium coal raw material comes from a raw coal separation system, and the medium coal raw material contains medium coal medium liquid; the medium coal fine separation process comprises the following steps: The medium coal obtained from the raw coal sorting system is de-intermediated to obtain re-sorted medium coal and medium coal mixed liquid; The clean coal mixed medium liquid obtained from the raw coal separation system is mixed with the medium liquid of the medium coal to prepare the medium liquid of the medium coal re-separation; The reselected medium coal and the medium coal reselection liquid are mixed and transported to a separation device for separation to obtain concentrate products and tailings products. The medium coal fine sorting process provided in the embodiment of the present invention is used for medium coal re-selection, wherein the medium coal raw material for medium coal re-selection comes from the raw coal sorting system. The raw coal sorting system includes a three-stage heavy medium cyclone, a combined medium barrel, a clean coal recovery module, a medium coal recovery module and a gangue recovery module. After the raw coal is sorted by the three-stage heavy medium cyclone, clean coal products, medium coal products and gangue products are obtained. The medium coal products are the medium coal raw materials of the medium coal fine sorting equipment. The medium coal products can be transported to the medium coal fine sorting equipment through structures such as chutes for re-selection to recover the clean coal therein. The clean coal recovery module, the medium coal recovery module and the gangue recovery module are generally composed of structures such as arc screens, de-mediation screens and centrifuges for de-mediation and dehydration. The medium liquid obtained by de-mediation of the above three products is transported to the combined medium barrel for recovery, and can be mixed with the raw coal and transported to the three-stage heavy medium cyclone for raw coal sorting. In addition, the raw coal sorting system also has a clean coal mixed medium pipeline for conveying clean coal mixed medium liquid. A tee is added to the clean coal mixed medium pipeline to convey part of the clean coal mixed medium liquid to the medium coal fine sorting equipment for configuring the medium coal re-selection mixed medium liquid.

[0020] In the process of medium coal reselection, the medium coal raw material is firstly de-intermediated to obtain medium coal for reselection and medium coal mixed medium liquid. The purpose of de-intermediation is to remove most of the medium coal mixed medium liquid in the medium coal raw material to avoid the medium coal mixed medium liquid content in the medium coal raw material being too high and affecting the subsequent medium coal reselection; the medium coal mixed medium liquid is used to mix with the fine coal mixed medium liquid in the raw coal sorting system to prepare the medium coal reselection mixed medium liquid required for medium coal reselection; after the medium coal reselection mixed medium liquid is prepared, it is mixed with the medium coal for reselection and transported to the sorting device for sorting, thereby obtaining concentrate products and tailings products. The medium coal fine sorting process provided in this embodiment is combined with the raw coal sorting system to recover the medium coal products of the raw coal sorting system. The medium coal reselection mixed medium liquid required for recovering the medium coal products also comes from the raw coal sorting system. By recovering the medium coal products of the raw coal sorting system, the scarce coal resources are fully utilized and protected, creating huge economic benefits.

[0021] Furthermore, the medium coal fine separation process provided by the embodiment of the present invention includes the following steps: removing the medium coal obtained by the raw coal separation system from the raw coal separation system; The medium coal obtained by the raw coal sorting system is graded to obtain first medium coal and second medium coal, wherein the particle size of the first medium coal is larger than that of the second medium coal; The first medium coal is disintegrated and crushed to obtain the third medium coal; The second medium coal is de-mediumized to obtain medium liquid for medium separation; The second medium coal after de-mediation is mixed with the third medium coal to obtain the re-selected medium coal.

[0022] In this embodiment, the fine separation process of medium coal also includes classification and dissociation and crushing of medium coal raw materials to avoid the medium coal raw materials having too large particle size affecting separation, and to avoid the coupling of gangue and clean coal affecting the recovery of clean coal in medium coal products. Specifically, after the raw coal products are classified, the first medium coal and the second medium coal are obtained. The first medium coal has a larger particle size and needs to be dissociated and crushed. The product obtained after the dissociation and crushing of the first medium coal is the third medium coal. The third medium coal and the second medium coal after de-intermediation are the re-selected medium coal.

[0023] The fine separation process of medium coal provided in the embodiment of the present invention comprises the steps of mixing the reselected medium coal and the medium coal reselection medium and conveying them to a separation device for separation to obtain a concentrate product and a tailings product, and further comprising the steps of: Transport the concentrate products to the raw coal sorting system for de-mediation and dehydration; The tailings products are transported to the raw coal sorting system for de-mediation and dehydration.

[0024] In this embodiment, the concentrate product and tailings product obtained by the sorting device are recovered by the raw coal sorting system to improve the economic benefits of the raw coal sorting system.

[0025] The medium coal fine separation process provided by the embodiment of the present invention includes the steps of mixing the clean coal mixed medium liquid obtained from the raw coal separation system with the medium coal mixed medium liquid to prepare the medium coal re-separation mixed medium liquid, and further comprising: Part of the medium coal mixed liquid is transported to the raw coal sorting system for standby use, and the remaining medium coal mixed liquid is mixed with the clean coal mixed liquid diverted from the raw coal sorting system to prepare the medium coal re-selection mixed liquid.

[0026] In this embodiment, part of the medium coal mixed medium liquid produced by the de-mediumization of the medium coal raw material is transported to the raw coal sorting system for preparing the medium liquid required for raw coal sorting, and the remaining part is mixed with the clean coal mixed medium liquid from the raw coal sorting system to prepare the medium coal re-selection mixed medium liquid, thereby saving production costs and improving economic benefits.

[0027] Another embodiment of the present invention further provides a medium coal fine sorting equipment, which adopts the medium coal fine sorting process described in any of the above embodiments; the medium coal fine sorting equipment comprises: a screening device 1, a sorting device 2, a mixing chamber 41, a combining chamber 44 and a conveying system; the screening device 1 comprises a first screen assembly, the first screen assembly is used to de-intermediate the medium coal raw material, the above-screen material discharge end of the first screen assembly is connected to the mixing chamber 41, and the below-screen material discharge end of the first screen assembly is connected to the combining chamber 44; the conveying system is used to transport the material in the combining chamber 44 and the clean coal combining liquid to the mixing chamber 41, and to transport the material in the mixing chamber 41 to the sorting device 2. The above-mentioned medium coal fine sorting equipment includes a screening device 1, a sorting device 2, a mixing chamber 41, a mixing chamber 44 and a conveying system. The screening device 1 comprises a screen frame and a first screen assembly located in the screen frame. The screen frame is arranged on a shock-absorbing bracket to reduce the influence of vibration generated during the operation of the screening device on other structures of the medium coal fine sorting equipment. The medium coal product of the raw coal sorting system, as the medium coal raw material of the medium coal fine sorting equipment, contains medium coal mixed medium when it is transported to the medium coal fine sorting equipment. The first screen assembly is used to remove the medium from the medium coal raw material, so as to obtain reselected medium coal and medium mixed medium; the reselected medium coal is transported to the mixing chamber 41 as the above-screen material of the first screen assembly, and the medium coal mixed medium is transported to the mixing chamber 44 as the under-screen material of the first screen assembly, so as to configure the medium coal reselection mixed medium required for the subsequent medium coal reselection; the conveying system comprises a first conveying pump 52, a first conveying pipeline 51, a second conveying pump 54, a second conveying pipeline 53 and a clean coal mixed medium conveying pipeline; both ends of the second conveying pipeline 53 They are respectively connected with the combining chamber 44 and the mixing chamber 41, and the two ends of the clean coal combining medium conveying pipeline are respectively connected with the tee added to the above-mentioned clean coal combining medium pipeline and the mixing chamber 41, the second conveying pump 54 is arranged on the second conveying pipeline 53 and pumps the medium coal combining medium liquid in the combining chamber 44 to the mixing chamber 41, and the clean coal combining medium liquid is conveyed to the mixing chamber 41 through the clean coal combining medium conveying pipeline, and the medium coal combining medium liquid and the clean coal combining medium liquid are mixed in the mixing chamber 41 to obtain the medium coal re-selection combining medium liquid; the ratio of the medium coal combining medium liquid and the clean coal combining medium liquid is set according to the actual situation, which does not belong to the protection scope of the present invention; the two ends of the first conveying pipeline 51 are respectively connected with the mixing chamber 41 and the feeding end of the sorting device 2, the first conveying pump 52 is arranged on the first conveying pipeline 51 and pumps the re-selected medium coal and the medium coal re-selection combining medium liquid in the mixing chamber 41 to the sorting device 2 for sorting, and obtains the concentrate product and the tailings product.

[0028] The medium coal fine sorting equipment provided in this embodiment, by combining with the original raw coal sorting system to reselect the medium coal products of the raw coal sorting system and recover the clean coal in the medium coal products, fully utilizes and protects the scarce coal resources, and creates huge economic benefits. Optionally, in this embodiment, the above-mentioned screening device 1 can adopt a linear vibrating screen, an arc screen or a high-frequency vibrating screen, etc., and the above-mentioned sorting device 2 adopts a cyclone.

[0029] The medium coal fine separation equipment provided by the embodiment of the present invention is as follows: Figure 2 and Figure 3 As shown, the medium coal fine sorting equipment also includes a crushing device 3; the screening device 1 also includes a second screen assembly; the second screen assembly and the first screen assembly are arranged in sequence, and the screening particle size of the second screen assembly is larger than the screening particle size of the first screen assembly; the discharge end of the material on the screen of the second screen assembly is connected to the crushing device 3, and the discharge end of the crushing device 3 is connected to the mixing chamber 41.

[0030] The above-mentioned screening device 1 is a double-layer screen, and the screening device 1 also includes a second screen assembly arranged in the screen frame, and the screening particle size of the second screen assembly is larger than the screening particle size of the first screen assembly; the second screen assembly is used to classify the medium coal raw material to avoid the medium coal raw material having a large particle size and affecting the subsequent sorting of the sorting device 2; the above-mentioned crushing device 3 can adopt a vertical compound crusher, and the crushing device 3 is used to crush the material on the screen of the second screen assembly; when in use, the medium coal product of the raw coal sorting system is transported to the second screen assembly through the chute as the medium coal raw material of the medium coal fine sorting equipment, and the material on the screen of the second screen assembly is the first medium coal, The material under the screen of the second screen assembly directly falls onto the first screen assembly; the first medium coal is conveyed to the crushing device 3 for dissociation and crushing to obtain the third medium coal, the material on the screen of the first screen assembly is the second medium coal, the second medium coal and the third medium coal are both conveyed to the mixing chamber 41 as reselected medium coal, and the material under the screen of the first screen assembly is the medium coal mixed medium liquid, which is conveyed to the combining chamber 44; the medium coal mixed medium liquid in the combining chamber 44 and the clean coal mixed medium liquid from the raw coal sorting system are conveyed to the mixing chamber 41 in proportion by the conveying system to obtain a mixture of the reselected medium coal and the medium coal reselection mixed medium liquid, which is then conveyed to the sorting device 2 by the conveying system for sorting.

[0031] Optionally, in this embodiment, part of the medium coal mixed medium liquid in the mixed medium chamber 44 can also be provided with a delivery pipeline and a delivery pump to be pumped back to the raw coal sorting system for configuring the medium liquid used in raw coal sorting.

[0032] The medium coal fine separation equipment provided by the embodiment of the present invention is as follows: Figure 2 and Figure 3 As shown, the medium coal fine sorting equipment further includes a concentrate chamber 42 for storing concentrate products of the sorting device 2 and a tailing chamber 43 for storing tailing products of the sorting device 2 .

[0033] The above content mentioned that the products of the reselected coal after sorting by the sorting device 2 are concentrate products and tailing products. The concentrate products are transported to the concentrate chamber 42 for storage, and the tailing products are transported to the tailing chamber 43 for storage. After the concentrate products in the concentrate chamber 42 and the tailing products in the tailing chamber 43 accumulate to a certain amount, they are transported by the conveying system to the raw coal sorting system for recovery. The fine sorting equipment for medium coal is provided with the concentrate chamber 42 and the tailing chamber 43, so that the integrity of the device is stronger, the function is more complete, and it is convenient for intelligent control.

[0034] The medium coal fine separation equipment provided by the embodiment of the present invention is as follows: Figure 2 and Figure 3 As shown, it also includes a working pool 4; a plurality of partitions 45 are arranged in the working pool 4, and the working pool 4 is divided into a mixing chamber 41, a mixing chamber 44, a concentrate chamber 42 and a tailing chamber 43 by the partitions 45.

[0035] Preferably, in this embodiment, a partition 45 is provided in the working pool 4 to divide the interior of the working pool 4 into a plurality of spaces, each of which is a mixing chamber 41, a combination chamber 44, a concentrate chamber 42 and a tailing chamber 43. By providing a partition 45 in the working pool 4 to separate the mixing chamber 41, the combination chamber 44, the concentrate chamber 42 and the tailing chamber 43, the medium coal fine sorting equipment occupies a small space, has a strong integrity, is convenient for control and convenient for inspection and maintenance, etc. Among them, the mixing chamber 41, the combination chamber 44, the concentrate chamber 42 and the tailing chamber 43 are preferably arranged in a "field" shape, that is, the above-mentioned partition 45 is provided with two and in a "cross" shape, so that the medium coal fine sorting equipment structure is more compact and convenient for arrangement. Optionally, the mixing chamber 41, the combination chamber 44, the concentrate chamber 42 and the tailing chamber 43 can also be arranged in a straight line, so that only four partitions 45 arranged at intervals are required in the working pool 4. It is understandable that, in this embodiment, four independent barrel structures may be provided as the mixing chamber 41 , the combining chamber 44 , the concentrate chamber 42 and the tailings chamber 43 mentioned above.

[0036] In this embodiment, a clean coal mixed medium liquid inlet is opened on part of the side wall of the working pool 4 located in the mixing chamber 41, which is used for the above-mentioned clean coal mixed medium conveying pipeline; the clean coal mixed medium liquid inlet is opened on the side wall of the working pool 4, which can facilitate the routing of the clean coal mixed medium conveying pipeline, and the screening device 1, the crushing device 3 and the sorting device 2 can be arranged above the working pool 4 subsequently, which can avoid the clean coal mixed medium conveying pipeline affecting the arrangement of the screening device 1, the crushing device 3 and the sorting device 2.

[0037] The medium coal fine separation equipment provided by the embodiment of the present invention is as follows: Figure 2 and Figure 3As shown, the concentrate chamber 42 and the tailing chamber 43 are adjacent, and the upper ends of the concentrate chamber 42 and the tailing chamber 43 are open; the sorting device 2 is located above the working pool 4, and the concentrate outlet of the sorting device 2 is located above the concentrate chamber 42, and the tailing outlet of the sorting device 2 is located above the tailing chamber 43.

[0038] Preferably, in the present embodiment, the concentrate chamber 42 and the tailing chamber 43 are adjacent to each other in the working pool 4, and the upper ends of the concentrate chamber 42 and the tailing chamber 43 are both open. The above-mentioned sorting device 2 is arranged above the partition 45 between the concentrate chamber 42 and the tailing chamber 43, and the concentrate outlet of the sorting device 2 is located above the concentrate chamber 42, and the tailings outlet is located above the tailings chamber 43. In this way, the concentrate product discharged from the concentrate outlet can directly enter the concentrate chamber 42, and the product discharged from the tailings outlet can directly enter the tailings chamber 43. There is no need to set up auxiliary structures such as chutes or pipelines, which can improve the compactness of the medium coal fine sorting equipment, facilitate the layout of the medium coal fine sorting equipment, and reduce the overall cost.

[0039] The medium coal fine separation equipment provided by the embodiment of the present invention is as follows: Figure 2 and Figure 3 As shown, a first mounting member 46 is disposed at the upper end of the mixing chamber 41 ; the crushing device 3 is disposed on the first mounting member 46 , and a discharge end of the crushing device 3 is located above the mixing chamber 41 .

[0040] In this embodiment, the crushing device 3 is mounted above the mixing chamber 41 through the first mounting member 46, and the discharging end of the crushing device 3 is also located above the mixing chamber 41. In this way, the third medium coal obtained by the crushing device 3 can directly enter the mixing chamber 41 without setting up auxiliary structures such as chutes or pipelines, which can improve the compactness of the medium coal fine sorting equipment, facilitate the layout of the medium coal fine sorting equipment, and reduce the overall cost.

[0041] Optionally, in this embodiment, the first mounting member 46 is a plate-like structure with good stability. The first mounting member 46 is connected to the upper edge of the mixing chamber 41 on all sides, and the upper edge of the mixing chamber 41 is the frame of the open end of the mixing chamber 41. In this way, the first mounting member 46 with a plate-like structure can also close the open end of the mixing chamber 41, so as to avoid the splashing of the medium liquid when the third medium coal discharged by the crushing device 3 enters the mixing chamber 41. Of course, in this embodiment, the first mounting member 46 can also be set as a beam, or a frame structure, etc., which can achieve the purpose of supporting the crushing device 3 in this embodiment. The first mounting plate is provided with an opening corresponding to the discharge end of the crushing device 3, and the third medium coal discharged from the discharge end of the crushing device 3 can enter the mixing chamber 41 through the opening; further, the first mounting member 46 is also provided with an opening corresponding to the second conveying pipeline 53, so that the medium liquid can be injected into the mixing chamber 41.

[0042] The fine separation equipment for medium coal provided by the embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the combined medium chamber 44 and the mixing chamber 41 are adjacent. A second mounting member 47 is provided at the upper end of the combined medium chamber 44; the screening device 1 is arranged on the second mounting member 47; the discharge end of the oversize material of the first screen assembly is located above the mixing chamber 41, and the discharge end of the undersize material of the first screen assembly is located above the combined medium chamber 44; the discharge end of the oversize material of the second screen assembly is located above the feeding end of the crushing device 3.

[0043] In this embodiment, the oversize material of the second screen assembly will be discharged into the crushing device 3. In order to improve the integrity of the fine separation equipment for medium coal, the screening device 1 is arranged beside the crushing device 3. In this way, only structures such as chutes need to be set up to achieve the purpose of conveying the first medium coal discharged from the second screen assembly to the crushing device 3. Further, the oversize material of the first screen assembly will be directly discharged into the mixing chamber 41, and the undersize material of the first screen assembly will be directly discharged into the combined medium chamber 44. Therefore, preferably, the mixing chamber 41 and the combined medium chamber 44 are arranged adjacent to each other; the oversize material of the first screen assembly can be discharged into the mixing chamber 41 through a chute. Therefore, an opening for receiving the oversize material of the first screen assembly needs to be provided on the first mounting member 46. As mentioned above, the mixing chamber 41, the combined medium chamber 44, the concentrate chamber 42, and the tailings chamber 43 are arranged in a "field" shape. Therefore, the concentrate chamber 42 and the tailings chamber 43 are located on the same side, and the mixing chamber 41 and the combined medium chamber 44 are located on the same side. The screening device 1 is arranged above the combined medium chamber 44 to improve the integrity of the fine separation equipment for medium coal. A second mounting member 47 is provided at the upper end of the combined medium chamber 44 for installing the screening device 1.

[0044] Preferably, in this embodiment, the second mounting member 47 is also in a plate-like structure with good stability. The four sides of the second mounting member 47 are connected to the upper edge of the combined medium chamber 44 so that the second mounting member 47 can also close the open end of the combined medium chamber 44 to prevent the medium coal combined liquid in the combined medium chamber 44 from splashing. Of course, in this embodiment, the second mounting member 47 can also be set as a beam or a frame structure, etc., which can all achieve the purpose of supporting the screening device 1 in this embodiment. An opening corresponding to the discharge end of the undersize material of the first screen assembly of the screening device 1 is provided on the second mounting plate so that the undersize material of the first screen assembly can enter the combined medium chamber 44.

[0045] The fine separation equipment for medium coal provided by the embodiment of the present invention, such as Figure 2 and Figure 3 As shown, the raw coal separation system includes a clean coal recovery module and a medium coal recovery module; the conveying system is also used to convey the materials in the concentrate chamber 42 to the clean coal recovery module, and to convey the materials in the tailings pond to the medium coal recovery module.

[0046] The clean coal recovery module and the medium coal recovery module are conventional settings of the raw coal sorting system, so they are not described here. In this embodiment, the concentrate products and tailings products of the medium coal fine sorting equipment are returned to the raw coal sorting system for recovery through the conveying system. The conveying system also includes a third conveying pump 56, a third conveying pipeline 55, a fourth conveying pump 57 and a fourth conveying pipeline 58; wherein one end of the third conveying pipeline 55 is connected to the concentrate chamber 42, and the other end extends to the clean coal recovery module, and the third conveying pump 56 is arranged on the third conveying pipeline 55, and is used to convey the concentrate products in the concentrate chamber 42 to the clean coal recovery module; one end of the fourth conveying pipeline 58 is connected to the tailing chamber 43, and the other end extends to the medium coal recovery module, and the fourth conveying pump 57 is arranged on the fourth conveying pipeline 58, and is used to convey the tailings products in the tailing chamber 43 to the medium coal recovery module. The concentrate products and tailings products are returned to the raw coal recovery system through the conveying system, which can better combine the medium coal fine sorting equipment with the raw coal sorting system and improve economic benefits.

[0047] Preferably, in this embodiment, for ease of layout, the first delivery pump 52, the second delivery pump 54, the third delivery pump 56 and the fourth delivery pump 57 are arranged in parallel and located on one side of the concentrate chamber 42 and the tailings chamber 43 of the working pool 4, so as to improve the integrity of the medium coal fine sorting equipment, make the structure more compact and convenient to arrange, and also facilitate the inspection and maintenance of the four delivery pumps.

[0048] The medium coal fine separation equipment provided by the embodiment of the present invention is as follows: Figure 2 and Figure 3 As shown, the first delivery pump 52 is arranged on the first delivery pipeline 51; the first delivery pipeline 51 is also provided with at least one of a density meter, a magnetic material detector and a pressure gauge for detecting the sorting parameters to avoid affecting the re-selection of the medium coal.

[0049] The third embodiment of the present invention further provides a coal sorting system, comprising the medium coal fine sorting equipment described in any of the above embodiments, and a raw coal sorting system. The coal sorting system provided in this embodiment can realize medium coal re-selection and recover clean coal from medium coal, with better economic benefits.

[0050] In the description of the present invention, it should be noted that the terms "upper", "lower", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A medium coal fine separation process for medium coal re-selection, wherein the medium coal raw material comes from a raw coal separation system and contains a medium coal-mixing liquid; characterized in that: The medium coal fine separation process comprises the following steps: The medium coal obtained from the raw coal sorting system is de-intermediated to obtain re-sorted medium coal and medium coal mixed liquid; The clean coal mixed medium liquid obtained from the raw coal separation system is mixed with the medium liquid of the medium coal to prepare the medium liquid of the medium coal re-separation; The reselected medium coal and the medium coal reselection liquid are mixed and transported to a separation device for separation to obtain concentrate products and tailings products.

2. The medium coal fine separation process according to claim 1, characterized in that: The step of removing the medium coal obtained by the raw coal sorting system also includes: The medium coal obtained by the raw coal sorting system is graded to obtain first medium coal and second medium coal, wherein the particle size of the first medium coal is larger than that of the second medium coal; The first medium coal is disintegrated and crushed to obtain the third medium coal; The second medium coal is de-mediumized to obtain medium liquid for medium separation; The second medium coal after de-mediation is mixed with the third medium coal to obtain the re-selected medium coal.

3. The medium coal fine separation process according to claim 1, characterized in that: The step of mixing the reselected coal and the medium liquid for reselection of the medium coal and conveying them to a separation device for separation to obtain a concentrate product and a tailings product also includes the following steps: Transport the concentrate products to the raw coal sorting system for de-mediation and dehydration; The tailings products are transported to the raw coal sorting system for de-mediation and dehydration.

4. The medium coal fine separation process according to claim 1, characterized in that: The step of mixing the clean coal mixed medium liquid obtained from the raw coal separation system with the medium mixed medium liquid to prepare the medium mixed medium liquid for re-selection of medium coal also includes: Part of the medium coal mixed liquid is transported to the raw coal sorting system for standby use, and the remaining medium coal mixed liquid is mixed with the clean coal mixed liquid diverted from the raw coal sorting system to prepare the medium coal re-selection mixed liquid.

5. A medium coal fine sorting equipment, characterized in that: The medium coal fine separation process as claimed in any one of claims 1 to 4 is adopted; the medium coal fine separation equipment comprises: a screening device, a separation device, a mixing chamber, a mixing chamber and a conveying system; The screening device is arranged on the shock-absorbing bracket, and comprises a first screen assembly, which is used to remove the medium coal obtained by the raw coal sorting system, the material discharge end of the first screen assembly on the screen is connected to the mixing chamber, and the material discharge end of the first screen assembly under the screen is connected to the mixing chamber; The conveying system is used to convey the material in the mixing chamber and the clean coal mixing liquid to the mixing chamber, and is used to convey the material in the mixing chamber to the sorting device.

6. The medium coal fine separation equipment according to claim 5, characterized in that: It also includes a crushing device; the screening device also includes a second screen assembly; The second screen assembly and the first screen assembly are arranged in sequence, and the screening particle size of the second screen assembly is larger than the screening particle size of the first screen assembly; the discharge end of the screened material of the second screen assembly is connected to the crushing device, and the discharge end of the crushing device is connected to the mixing chamber.

7. The medium coal fine separation equipment according to claim 5, characterized in that: It also includes a concentrate chamber for storing the concentrate product of the sorting device and a tailing chamber for storing the tailing product of the sorting device.

8. The medium coal fine separation equipment according to claim 7, characterized in that: It also includes a working pool; a plurality of partitions are arranged in the working pool, and the working pool is divided into the mixing chamber, the mixing chamber, the concentrate chamber and the tailings chamber by the partitions.

9. The medium coal fine separation equipment according to claim 5, characterized in that: The conveying system is also used to convey the materials in the concentrate chamber and the materials in the tailings pond to the raw coal sorting system for recovery.

10. A coal sorting system, characterized in that: It comprises a raw coal sorting system and the medium coal fine sorting equipment as described in any one of claims 5 to 9.

Images