A system for enriching clay minerals from coal slurry

Abstract

The present application belongs to the technical field of solid waste treatment, and provides a system for enriching clay minerals from coal slime and a running method thereof, which solves the problems of difficult settling of coal slime water and difficult disposal of coal slime. The system comprises the following devices: a first-stage cyclone (3), a second-stage classification system, a third-stage classification system, a parallel cyclone group (16), a tail coal filter press (18), a clay thickener (19), and a clay filter press (20). The second-stage classification system comprises a second-stage cyclone jet aerator (6), a pipeline mixer (7), a flotation tank (8), a medium coal slime filter press (10), and a second-stage cyclone (23). The third-stage classification system comprises a parallel cyclone group (13) and a series cyclone group (21). The first overflow obtained from the first-stage cyclone (3) is subjected to subsequent treatment to obtain medium coal slime. Finally, the end product is converged, the overflow is fed into the clay filter press through the clay thickener, and clay minerals are obtained.

Description

Technical Field

[0001] This invention relates to the field of solid waste treatment technology, and in particular to a system for enriching clay minerals from coal slime and its operation method. Background Technology

[0002] Clay minerals are important non-metallic mineral resources, and coal-associated clay minerals are particularly advantageous in my country, playing a vital role in modern industrial development and technological advancement in traditional industries. These products offer high added value and good economic benefits. For the recovery and utilization of kaolin from lumpy coal gangue, methods such as dry air separation, intelligent dry separation, gravity separation, and heavy media separation have been reported in numerous studies, and some have already been industrialized. However, there are very few processes available for the recovery of clay minerals from coal slime.

[0003] With the continuous improvement of flotation technology, the ash content of coal tailings from coal preparation plants has generally increased to over 60%. This portion of coal tailings can no longer be sold as a coal product, and direct discharge would have a significant impact on the ecological environment. The problem of disposing of high-ash coal tailings can be solved by enriching and comprehensively utilizing clay minerals. Therefore, solving the current situation of coal tailings disposal and realizing the resource utilization of coal tailings solid waste has become an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to overcome the deficiencies in the prior art and provide a system and its operation method for enriching clay minerals from coal slime.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a system for enriching clay minerals from coal slime, comprising the following devices: a first hydrocyclone, a second classification system, a third classification system, a second parallel hydrocyclone group, a tailings filter press, a clay thickener, and a clay filter press. The second-stage classification system includes a second-stage cyclone jet aerator, a pipeline mixer, a flotation cell, a medium-coal slime filter press, and a second-stage cyclone separator; The third-stage classification system includes the first parallel hydrocyclone group and the series hydrocyclone group.

[0006] Preferably, the diameter of the single unit of the first hydrocyclone is 200~300mm; The individual diameter of the second-stage swirl jet inflator is 100~150mm; The diameter of the individual units in the second-stage hydrocyclone is 100~150mm.

[0007] Preferably, the ratio of the number of individual units of the first-stage cyclone separator and the second-stage cyclone jet inflator is 1:3~9; The ratio of the number of individual units in the first-stage hydrocyclone to that in the second-stage hydrocyclone is 1:3~9.

[0008] As a preferred option, the individual diameter of the second parallel hydrocyclone group is 15~35mm; The diameter of each individual hydrocyclone in the first parallel hydrocyclone group is 50~75mm; the diameter of each individual hydrocyclone in the series hydrocyclone group is 50~75mm.

[0009] Preferably, the ratio of the number of individual hydrocyclones in the first stage to the number of individual hydrocyclones in the first parallel hydrocyclone group is 1:10~22; The ratio of the number of individual hydrocyclones in the first stage to the number of individual hydrocyclones in the second parallel hydrocyclone group is 1:50~190.

[0010] The present invention also provides a method for operating the system for enriching clay minerals from coal slime, comprising the following steps: (1) The coal slurry water is fed into the first hydrocyclone for classification to obtain the first underflow and the first overflow; (2) The first overflow is fed into the second stage swirl jet aerator to obtain the second underflow and the second overflow; the second overflow enters the flotation cell through the pipeline mixer to obtain the foam product and the underflow; the foam product is fed into the medium coal slime filter press for dewatering to obtain medium coal slime; or; The first overflow is fed into the second hydrocyclone to obtain the second underflow and the second overflow; (3) The underflow of the second overflow or flotation cell is fed into the first parallel hydrocyclone group to obtain the third underflow and the third overflow, and the third overflow is fed into the second parallel hydrocyclone group to obtain the fourth underflow and the fourth overflow; or; The overflow or underflow from the second overflow or flotation cell is fed into a series of hydrocyclones to obtain the overflow and underflow. (4) The underflow generated by the first underflow, the second underflow, the third underflow, the fourth underflow and the series hydrocyclone group is fed into the tailings filter press, and the tailings are obtained by filter pressing and dewatering. (5) The overflow generated by the fourth overflow or the series hydrocyclone group is fed into the clay filter press through the clay thickener, and the clay minerals are obtained by filter pressing and dewatering.

[0011] This invention provides a system for enriching clay minerals from coal slime, comprising the following devices: a first-stage hydrocyclone, a second-stage classification system, a third-stage classification system, a second parallel hydrocyclone group, a tailings filter press, a clay thickener, and a clay filter press; the second-stage classification system includes a second-stage cyclone jet aerator, a pipeline mixer, a flotation cell, a middlings filter press, and a second-stage hydrocyclone; the third-stage classification system includes a first parallel hydrocyclone group and a series hydrocyclone group.

[0012] This invention also provides a method for operating the system. The system performs subsequent processing on the first overflow obtained from the first hydrocyclone. Depending on the raw material or the equipment selected for the next step, different processing methods are used to obtain medium-coal slime, underflow, or a second overflow. Then, depending on the selection of the first parallel hydrocyclone group or the series hydrocyclone group for the next step, different processing methods are operated, ultimately obtaining a fourth underflow, a fourth overflow, and overflow and underflow generated by the series hydrocyclone group. Finally, the final products are collected. The underflow enters a tailings filter press for dewatering to obtain tailings, while the overflow is concentrated in a clay thickener and then fed into a clay filter press for dewatering to obtain clay minerals.

[0013] The system structure for enriching clay minerals from coal slime provided by this invention is well-defined, flexible and reliable. Different processes can be selected according to the coal slime conditions on site and design objectives to obtain corresponding products, complete the recovery of clay minerals, and solve the problems of sedimentation of difficult-to-settle coal slime water and the difficulty in disposing of coal slime. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the process for enriching clay minerals from coal slime in Example 1; Among them, 1 is the first feed tank, 2 is pump one, 3 is the first stage hydrocyclone, 4 is the second feed tank, 5 is pump two, 6 is the second stage hydrocyclone jet aerator, 7 is the pipeline mixer, 8 is the flotation cell, 9 is the middlings tank, 10 is the middlings slime filter press, 11 is the third feed tank, 12 is pump three, 13 is the first parallel hydrocyclone group, 14 is the fourth feed tank, 15 is pump four, 16 is the second parallel hydrocyclone group, 17 is the tailings tank, 18 is the tailings filter press, 19 is the clay thickener, and 20 is the clay filter press. Figure 2 This is a schematic diagram of the process for enriching clay minerals from coal slime in Example 2; Among them, 1 is the first feed bucket, 2 is pump one, 3 is the first stage hydrocyclone, 4 is the second feed bucket, 5 is pump two, 6 is the second stage hydrocyclone jet aerator, 7 is the pipeline mixer, 8 is the flotation cell, 9 is the middlings bucket, 10 is the middlings slime filter press, 11 is the third feed bucket, 12 is pump three, 17 is the tailings bucket, 18 is the tailings filter press, 19 is the clay thickener, 20 is the clay filter press, and 21 is the series hydrocyclone group; Figure 3 This is a schematic diagram of the process for enriching clay minerals from coal slime in Example 3; Among them, 1 is the first feed bucket, 2 is pump one, 3 is the first stage hydrocyclone, 4 is the second feed bucket, 5 is pump two, 23 is the second stage hydrocyclone, 11 is the third feed bucket, 12 is pump three, 13 is the first parallel hydrocyclone group, 14 is the fourth feed bucket, 15 is pump four, 16 is the second parallel hydrocyclone group, 17 is the tailings bucket, 18 is the tailings filter press, 19 is the clay thickener, 20 is the clay filter press, and 22 is the clay thickening tank. Figure 4 Here is a scanning electron microscope image of the clay minerals in Example 1; Figure 5 Here is a scanning electron microscope image of the clay minerals in Example 2; Figure 6 This is a scanning electron microscope image of the clay minerals in Example 3. Detailed Implementation

[0015] This invention provides a system for enriching clay minerals from coal slime, comprising the following devices: a first hydrocyclone, a second classification system, a third classification system, a second parallel hydrocyclone group, a tailings filter press, a clay thickener, and a clay filter press. The second-stage classification system includes a second-stage cyclone jet aerator, a pipeline mixer, a flotation cell, a medium-coal slime filter press, and a second-stage cyclone separator; The third-stage classification system includes the first parallel hydrocyclone group and the series hydrocyclone group.

[0016] In this invention, the system for enriching clay minerals from coal slime further includes the following devices: a first feed tank, a pump, a second feed tank, a pump, a middlings tank, a third feed tank, a pump, a fourth feed tank, a pump, a tailings tank, and a clay thickening tank.

[0017] In this invention, the diameter of the single unit of the first hydrocyclone is preferably 200-300 mm, more preferably 200-275 mm, and even more preferably 200-250 mm.

[0018] In this invention, the diameter of the second-stage swirling jet inflator is preferably 100-150 mm, more preferably 100-138 mm, and even more preferably 100-125 mm.

[0019] In this invention, the diameter of the second hydrocyclone is preferably 100-150 mm, more preferably 100-138 mm, and even more preferably 100-125 mm.

[0020] In this invention, the ratio of the number of individual units of the first cyclone separator and the second cyclone jet inflator is preferably 1:3 to 9, more preferably 1:4 to 8, and even more preferably 1:4 to 6.

[0021] In this invention, the ratio of the number of individual units of the first hydrocyclone and the second hydrocyclone is preferably 1:3 to 9, more preferably 1:4 to 8, and even more preferably 1:4 to 6.

[0022] In this invention, the diameter of the individual units of the second parallel cyclone separator group is preferably 15-35 mm, more preferably 15-30 mm, and even more preferably 15-25 mm.

[0023] In this invention, the individual diameter of the first parallel hydrocyclone group is preferably 50-75 mm, more preferably 50-70 mm, and even more preferably 50-60 mm; the individual diameter of the series hydrocyclone group is preferably 50-75 mm, more preferably 50-70 mm, and even more preferably 50-60 mm.

[0024] In this invention, the overflow port diameter of each individual hydrocyclone in the series decreases, preferably by 20-25%, more preferably by 21-24%, and even more preferably by 22-24%; the feed port diameter of each individual hydrocyclone in the series decreases, preferably by 20-25%, more preferably by 21-24%, and even more preferably by 22-24%.

[0025] In this invention, the ratio of the number of individual units of the first hydrocyclone and the first parallel hydrocyclone group is preferably 1:10~22, more preferably 1:12~16, and even more preferably 1:13~15.

[0026] In this invention, the ratio of the number of individual units in the first hydrocyclone and the second parallel hydrocyclone group is preferably 1:50~190, more preferably 1:80~150, and even more preferably 1:100~144.

[0027] In this invention, the ratio of the number of individual hydrocyclones in the first stage to the number of tandem hydrocyclones is preferably 1:10 to 22, more preferably 1:12 to 16, and even more preferably 1:13 to 15.

[0028] The present invention also provides a method for operating the system for enriching clay minerals from coal slime, comprising the following steps: In this invention, the coal slurry from the coal preparation plant first enters the first feed bucket, and then is pumped into the first hydrocyclone for classification to obtain the first underflow and the first overflow; the first overflow is collected into the second feed bucket and pumped into the next device.

[0029] In this invention, the first overflow can be processed in different ways, either by feeding it into the second stage swirling jet inflator or into the second stage swirling jet inflator.

[0030] In this invention, when the first overflow is fed into the second stage swirl jet aerator, it is graded to obtain the second underflow and the second overflow; after the second overflow is aerated, it enters the flotation cell through the pipeline mixer for flotation decarbonization to obtain foam products and underflow; the foam products are collected into the middlings bucket, and then fed into the middlings slime filter press for dewatering to obtain middlings slime.

[0031] In this invention, a collector and a foaming agent are added to the flotation cell or the overflow pipe of the second cyclone jet aerator, thereby enabling the flotation cell to perform flotation decarbonization.

[0032] In this invention, the foaming method of the flotation cell is the self-aspiration or aeration foaming of a traditional mechanical stirring flotation machine, or the foaming of a flotation column jet or a microbubble generator.

[0033] In this invention, after the first overflow is fed into the second stage hydrocyclone for grading, a second underflow and a second overflow are obtained.

[0034] In this invention, the underflow generated by the second overflow or flotation cell is collected into the third feed tank and processed using different methods, such as feeding it into the first parallel hydrocyclone group or feeding it into the series hydrocyclone group.

[0035] In this invention, when the second overflow or the underflow of the flotation cell is collected in the third feed tank, it is pumped into the first parallel hydrocyclone group for grading to obtain the third underflow and the third overflow. The third overflow is collected in the fourth feed tank and pumped into the second parallel hydrocyclone group to obtain the fourth underflow and the fourth overflow.

[0036] In this invention, when the second overflow or the underflow of the flotation cell collected in the third feed tank is pumped into the series hydrocyclone group, the overflow and underflow are obtained in stages.

[0037] In this invention, the underflow generated by the first underflow, the second underflow, the third underflow, the fourth underflow and the series hydrocyclone group is collected into the tailings bucket, and then fed into the tailings filter press, where it is dewatered to obtain tailings.

[0038] In this invention, the overflow generated by the fourth overflow or the series hydrocyclone group is collected and concentrated by a clay thickener, and then fed into a clay filter press for dehydration to obtain clay minerals.

[0039] In this invention, the overflow after being processed by the clay thickener can be fed back into the clay thickening tank for a second thickening to obtain a slurry that meets the feed concentration requirements of the filter press.

[0040] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0041] Example 1

[0042] In this embodiment, the diameter of a single unit of the first hydrocyclone 3 is 200 mm, the diameter of a single unit of the second hydrocyclone jet inflator 6 is 100 mm, and the ratio of the number of units of the first hydrocyclone 3 and the second hydrocyclone jet inflator 6 is 1:4; the diameter of a single unit of the second parallel hydrocyclone group 16 is 25 mm, the diameter of a single unit of the first parallel hydrocyclone group 13 is 50 mm, and the ratio of the number of units of the first hydrocyclone 3 and the first parallel hydrocyclone group 13 is 1:16; the ratio of the number of units of the first hydrocyclone 3 and the second parallel hydrocyclone group 16 is 1:100.

[0043] Coal slime first enters the first feed tank 1, and is fed into the first stage hydrocyclone 3 by pump 2 for classification, resulting in the first underflow and the first overflow. The first overflow enters the second feed tank 4, and is fed into the second stage hydrocyclone jet aerator 6 by pump 2 for second-stage classification, resulting in the second underflow and the second overflow. After being aerated, the second overflow enters the flotation cell 8 through the pipeline mixer 7. Under the action of the collector, the middlings particles adhere to the bubbles and float to the surface to become foam products. After being fed into the middlings slime filter press 10 through the middlings tank 9 for dewatering, middlings slime is obtained. The underflow from flotation cell 8 enters the third feed tank 11 and is fed into the first parallel hydrocyclone group 13 by pump 3 12. The underflow and the third overflow are obtained by classification. The third overflow passes through the fourth feed tank 14 and is fed into the second parallel hydrocyclone group 16 by pump 4 15. The underflow and the fourth overflow are obtained by classification. The fourth overflow is concentrated by clay thickener 19 and dewatered by clay filter press 20 to become clay minerals. The first, second, third, and fourth underflows are combined and enter the tailings bucket 17, and then dewatered by the tailings filter press 18 to become the tailings product.

[0044] The flowchart illustrating the process of enriching clay minerals from coal slime in this embodiment is shown below. Figure 1 As shown.

[0045] Example 2

[0046] In this embodiment, the diameter of a single unit of the first hydrocyclone 3 is 200 mm, the diameter of a single unit of the second hydrocyclone jet aerator 6 is 100 mm, and the ratio of the number of units of the first hydrocyclone 3 and the second hydrocyclone jet aerator 6 is 1:4; the diameter of a single unit of the series hydrocyclone group 21 is 50 mm, the overflow port of the single unit of the series hydrocyclone group 2 decreases by 20%, and the feed port decreases by 20%; the ratio of the number of units of the first hydrocyclone 3 to the number of units of the series hydrocyclone group 21 is 1:16.

[0047] Coal slime first enters the first feed tank 1, and is fed into the first stage hydrocyclone 3 by pump 2 for classification, resulting in the first underflow and the first overflow. The first overflow enters the second feed tank 4, and is fed into the second stage hydrocyclone jet aerator 6 by pump 2 for second-stage classification, resulting in the second underflow and the second overflow. After being aerated, the second overflow enters the flotation cell 8 through the pipeline mixer 7. Under the action of the collector, the middlings particles adhere to the bubbles and float to the surface to become foam products. After being fed into the middlings slime filter press 10 through the middlings tank 9 for dewatering, middlings slime is obtained. The underflow from flotation cell 8 enters the third feed tank 11 and is fed into the series hydrocyclone group 21 by pump 3 12 to obtain overflow and underflow. The overflow is concentrated by clay thickener 19 and dewatered by clay filter press 20 to become clay minerals. The underflow from the series hydrocyclone group 21 is combined with the first and second underflows and enters the tailings bin 17. Then, after being dewatered by the tailings filter press 18, it becomes the tailings product.

[0048] The flowchart illustrating the process of enriching clay minerals from coal slime in this embodiment is shown below. Figure 2 As shown.

[0049] Example 3

[0050] In this embodiment, the diameter of a single unit of the first hydrocyclone 3 is 200 mm, the diameter of a single unit of the second hydrocyclone 23 is 100 mm, and the ratio of the number of units of the first hydrocyclone 3 to the second hydrocyclone 23 is 1:4; the diameter of a single unit of the second parallel hydrocyclone group 16 is 25 mm, the diameter of a single unit of the first parallel hydrocyclone group 13 is 50 mm, and the ratio of the number of units of the first hydrocyclone 3 to the first parallel hydrocyclone group 13 is 1:16; the ratio of the number of units of the first hydrocyclone 3 to the second parallel hydrocyclone group 16 is 1:100.

[0051] The coal slime from the coal preparation plant first enters the first feed tank 1, and is fed into the first hydrocyclone 3 by pump 1 2 for classification, resulting in the first underflow and the first overflow. The first overflow enters the second feed tank 4, and is fed into the second hydrocyclone 23 by pump 2 5 for the second stage classification, resulting in the second underflow and the second overflow. The second overflow enters the third feed tank 11, and is fed into the first parallel hydrocyclone group 13 by pump 3 12, resulting in the third underflow and the third overflow. The third overflow passes through the fourth feed tank 14, and is fed into the second parallel hydrocyclone group 16 by pump 4 15 for the final classification, resulting in the fourth underflow and the fourth overflow. The fourth overflow enters the clay thickener 19 for the first concentration, and the underflow from the clay thickener 19 enters the clay thickening tank 22 for the second concentration. The underflow from the clay thickener 22 is dewatered by the clay filter press 20 to become clay minerals. The first, second, third, and fourth underflows are combined and enter the tailings bin 17, and then dewatered by the tailings filter press 18 to become the tailings product. A schematic diagram of the process for enriching clay minerals from coal slime in this embodiment is shown below. Figure 3As shown.

[0052] The products obtained in Examples 1-3 were tested, and the results are recorded in Table 1.

[0053] Table 1 Test Results

[0054] The clay minerals obtained in Examples 1-3 were scanned by electron microscopy. Figure 4 Here is a scanning electron microscope image of the clay minerals in Example 1; Figure 5 Here is a scanning electron microscope image of the clay minerals in Example 2; Figure 6 This is a scanning electron microscope image of the clay minerals in Example 3.

[0055] from Figures 4-6 It can be seen that the clay minerals obtained by using Examples 1 to 3 are mainly composed of kaolinite minerals, with very small amounts of coal particles or quartz particles.

[0056] As can be seen from the above embodiments, the present invention will further process the first overflow obtained from the first hydrocyclone. Depending on the equipment selected in the next step, the processing method will be different, resulting in medium coal slime, underflow, or second overflow. Then, depending on the selection of parallel hydrocyclone groups or series hydrocyclone groups in the next step, different processing methods will be obtained, ultimately resulting in a fourth underflow, a fourth overflow, an overflow and a tailflow generated by the series hydrocyclone group 21. Finally, the final products will be collected, the underflow will enter the tailings filter press to obtain tailings, and the overflow will be fed into the clay filter press through the clay thickener to obtain clay minerals.

[0057] The system structure for enriching clay minerals from coal slime provided by this invention is well-defined, flexible and reliable. Different processes can be selected according to the coal slime conditions on site and design objectives to obtain corresponding products and complete the recovery of clay minerals.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A system for enriching clay minerals from coal slime, characterized in that, It includes the following devices: first feed tank (1), pump one (2), first stage hydrocyclone (3), second feed tank (4), pump two (5), second stage hydrocyclone jet aerator (6), pipeline mixer (7), flotation cell (8), middlings tank (9), middlings slime filter press (10), third feed tank (11), pump three (12), first parallel hydrocyclone group (13), fourth feed tank (14), pump four (15), second parallel hydrocyclone group (16), tailings tank (17), tailings filter press (18), clay thickener (19), clay filter press (20); (1) Coal slime first enters the first feed bucket (1), and is fed into the first stage hydrocyclone (3) by pump one (2) for classification, to obtain the first underflow and the first overflow; the first overflow enters the second feed bucket (4), and is fed into the second stage hydrocyclone jet aerator (6) by pump two (5) for second stage classification, to obtain the second underflow and the second overflow; after the second overflow is aerated, it enters the flotation cell (8) through the pipeline mixer (7), and under the action of the collector, the middlings particles adhere to the bubbles and float to become foam products, and are fed into the middlings slime filter press (10) through the middlings bucket (9) for dewatering to obtain middlings slime; (2) The underflow of the flotation cell (8) enters the third feed tank (11), and is fed into the first parallel hydrocyclone group (13) by the third pump (12). The third underflow and the third overflow are obtained by classification. The third overflow passes through the fourth feed tank (14), and is fed into the second parallel hydrocyclone group (16) by the fourth pump (15). The fourth underflow and the fourth overflow are obtained by classification. The fourth overflow is concentrated by the clay thickener (19) and dewatered by the clay filter press (20) to become clay minerals. (3) The first, second, third, and fourth underflows are combined and enter the tailings bucket (17), and then dewatered by the tailings filter press (18) to become tailings products; or; First feed tank (1), pump one (2), first stage hydrocyclone (3), second feed tank (4), pump two (5), second stage hydrocyclone jet aerator (6), pipeline mixer (7), flotation cell (8), middlings tank (9), middlings slime filter press (10), third feed tank (11), pump three (12), tailings tank (17), tailings filter press (18), clay thickener (19), clay filter press (20), series hydrocyclone group (21); (a) Coal slime first enters the first feed bucket (1), and is fed into the first stage hydrocyclone (3) by pump one (2) for classification, to obtain the first underflow and the first overflow; the first overflow enters the second feed bucket (4), and is fed into the second stage hydrocyclone jet aerator (6) by pump two (5) for second stage classification, to obtain the second underflow and the second overflow; after the second overflow is aerated, it enters the flotation cell (8) through the pipeline mixer (7), and under the action of the collector, the middlings particles adhere to the bubbles and float to become foam products, and are fed into the middlings slime filter press (10) through the middlings bucket (9) for dewatering to obtain middlings slime; (b) The underflow from the flotation cell (8) enters the third feed tank (11), and is fed into the series hydrocyclone group (21) by the third pump (12) to obtain the overflow and underflow. The overflow is concentrated by the clay thickener (19) and dewatered by the clay filter press (20) to become clay minerals. (c) The underflow from the series hydrocyclone group (21) is combined with the first and second underflows and enters the tailings bucket (17), and then dewatered by the tailings filter press (18) to become the tailings product; or; First feed tank (1), pump one (2), first hydrocyclone (3), second feed tank (4), pump two (5), second hydrocyclone (23), third feed tank (11), pump three (12), first parallel hydrocyclone group (13), fourth feed tank (14), pump four (15), second parallel hydrocyclone group (16), tailings tank (17), tailings filter press (18), clay thickener (19), clay filter press (20), clay thickening tank (22); (I) Coal slime first enters the first feed bucket (1), and is fed into the first hydrocyclone (3) by pump one (2) for classification, resulting in the first underflow and the first overflow; the first overflow enters the second feed bucket (4), and is fed into the second hydrocyclone (23) by pump two (5) for the second stage classification, resulting in the second underflow and the second overflow; the second overflow enters the third feed bucket (11), and is fed into the first parallel hydrocyclone group (13) by pump three (12), resulting in the third underflow and the third overflow; the third overflow passes through the fourth feed bucket (14), and is fed into the second parallel hydrocyclone group (16) by pump four (15) for the final classification, resulting in the fourth underflow and the fourth overflow; the fourth overflow enters the clay thickener (19) for the first concentration, and the underflow of the clay thickener (19) enters the clay thickening tank (22) for the second concentration, and the underflow of the clay thickening tank (22) becomes clay minerals after being dewatered by the clay filter press (20); (II) The first, second, third and fourth underflows are combined and enter the tailings bucket (17), and then dewatered by the tailings filter press (18) to become tailings products.

2. The system for enriching clay minerals from coal slime as described in claim 1, characterized in that, The diameter of the single unit of the first hydrocyclone (3) is 200~300mm; The diameter of the single unit of the second-stage swirling jet inflator (6) is 100~150mm; The diameter of the individual units of the second hydrocyclone (23) is 100~150mm.

3. The system for enriching clay minerals from coal slime as described in claim 1 or 2, characterized in that, The ratio of the number of units in the first cyclone separator (3) to the number of units in the second cyclone jet inflator (6) is 1:3~9; The ratio of the number of individual units in the first hydrocyclone (3) and the second hydrocyclone (23) is 1:3~9.

4. The system for enriching clay minerals from coal slime as described in claim 3, characterized in that, The individual diameter of the second parallel hydrocyclone group (16) is 15~35mm; The diameter of each individual hydrocyclone in the first parallel hydrocyclone group (13) is 50~75mm; the diameter of each individual hydrocyclone in the series hydrocyclone group (21) is 50~75mm.

5. The system for enriching clay minerals from coal slime as described in claim 4, characterized in that, The ratio of the number of individual units of the first hydrocyclone (3) to the first parallel hydrocyclone group (13) is 1:10~22; The ratio of the number of individual units in the first hydrocyclone (3) and the second parallel hydrocyclone group (16) is 1:50~190.

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