Coal slime flotation pilot production line and production process

Abstract

The present application relates to coal slime flotation technical field, more specifically, it relates to a kind of coal slime flotation pilot production line and production process, including the roughing flotation system, the cleaning flotation system, grinding device, first purification flotation system, secondary purification flotation, third purification flotation system and coal slime water system and kaolin production system connected in turn, and the production line adopts upper and lower double-layer structure, lower layer structure is arranged the equipment of coal slime flotation preparation stage, and upper layer structure is arranged coal slime flotation stage equipment.The present application provides a kind of coal slime flotation pilot production line and production process suitable for higher Al2O3, SiO2 Content, low cost, can be made coal slime flotation semi-industrial test, so that the achievement of laboratory is truly realized engineering and industrialization, reduce cost, improve coal slime flotation industry self-development ability and technical innovation ability.

Description

Technical Field

[0001] This invention relates to the field of coal slime flotation technology, and more specifically, to a pilot production line and process for coal slime flotation. Background Technology

[0002] Pilot-scale testing is a large-scale trial production conducted to adapt scientific research results to market and industrialization requirements, reduce transformation risks, and improve conversion rates. The purpose of this process is to verify, improve, and perfect laboratory or theoretical results, eliminate various uncertainties, and obtain reliable data, parameters, and controllable quality standards for intermediate products related to processes and equipment. Pilot-scale testing is a necessary step in the transformation of scientific and technological achievements into productive forces; the success or failure of industrialization largely depends on the success or failure of pilot-scale testing.

[0003] For the coal slime flotation industry, which produces high levels of refined coal, it is difficult to achieve engineering and industrialization without pilot-scale tests to further scale up the process. Only by establishing pilot-scale test lines can laboratory results be truly engineered and industrialized, thereby improving the industry's independent R&D and technological innovation capabilities.

[0004] Therefore, it is necessary to establish a pilot test line for coal slime flotation. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, a pilot production line and process for coal slime flotation are provided.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A pilot production line for coal slime flotation includes a roughing flotation system, a cleaning flotation system, a grinding device, a primary purification flotation system, a secondary purification flotation system, and a tertiary purification flotation system connected in sequence.

[0008] Furthermore, the roughing flotation system includes a roughing purification flotation machine, the cleaning flotation system includes a cleaning purification flotation machine, the primary purification flotation system includes a primary purification flotation machine, the secondary purification flotation system includes a secondary purification flotation machine, and the tertiary purification flotation system includes a tertiary purification flotation machine.

[0009] To optimize the structure, this production line comprises a double-layer structure. The roughing and refining flotation machine, the cleaning and refining flotation machine, the primary refining flotation machine, the secondary refining flotation machine, and the tertiary refining flotation machine are located in the upper layer and are each connected to a feed tank to prevent slurry accumulation between the flotation machines due to excessively rapid processing. The feed tank is located in the lower layer, and a slurry pump is installed between the feed tank and the next process. Material transfer between the lower and upper layers is carried out through the slurry pump.

[0010] Before flotation, the slurry needs to be pretreated. The front end of the roughing and purification flotation machine, the cleaning and purification flotation machine, the primary purification flotation machine, the secondary purification flotation machine, and the tertiary purification flotation machine are respectively connected to the corresponding slurry preprocessor.

[0011] Furthermore, it also includes a thickener, a filter press feed tank, and a filter press connected in sequence. The thickener is connected to a three-stage purification flotation system, and a slurry pump is installed between the filter press feed tank and the filter press.

[0012] To ensure the grinding effect, the grinding device includes a disc filter, a disc filter feed tank, a fine grinding mill, a fine grinding mill feed tank, an ultrafine grinding mill, and an ultrafine grinding mill feed tank connected in sequence.

[0013] A slurry pump is installed between the disc filter feed tank and the fine grinding mill, and between the fine grinding mill feed tank and the ultrafine grinding mill.

[0014] Furthermore, it also includes a coal slurry water system and a kaolin preparation system, wherein the roughing and purification flotation machine, the fine purification flotation machine, and the disc filter are all connected to the coal slurry water system;

[0015] The primary purification flotation machine, secondary purification flotation machine, tertiary purification flotation machine, thickener, and filter press are all connected to the kaolin preparation system.

[0016] A pilot-scale production process for coal slime flotation includes:

[0017] S1. Coal flotation: Coal slime is flotated using a coarse flotation purification flotation machine. Coal slime with low ash content enters the next process.

[0018] S2, clean coal flotation, the low-ash coal slime after flotation enters the next process;

[0019] S3. Filtration: Unfiltered slag enters the coal slurry water system, and the filtered coal slurry enters the next process.

[0020] S4. Grinding: The coal slime is ground using a fine grinding mill and an ultrafine grinding mill. The ground coal slime then enters the next process.

[0021] S5. Flotation purification: The ground coal slime is sequentially purified by a primary purification flotation machine, a secondary purification flotation machine, and a tertiary purification flotation machine.

[0022] Furthermore, it also includes:

[0023] S6. Concentration: The refined coal obtained by three flotation purifications is concentrated using a thickener. The overflow portion of the thickener enters the kaolin preparation system, and the low-flow portion enters the next process.

[0024] S7. Filtration: The concentrated coal enters the filter press for dewatering, producing coal with lower ash content. The filtrate enters the kaolin preparation system.

[0025] Furthermore, in S1 and S2, the tailings after flotation enter the coal slurry water system.

[0026] Furthermore, in S5, the tailings processed by the primary purification flotation machine, the secondary purification flotation machine, and the tertiary purification flotation machine all enter the coal slurry water system.

[0027] The beneficial effects of this invention compared to the prior art are as follows:

[0028] 1. This invention provides a low-cost pilot production line and process for coal slime flotation suitable for high Al2O3 and SiO2 content. It can be used for semi-industrial tests of coal slime flotation, enabling laboratory results to be truly engineered and industrialized, reducing costs, and improving the independent R&D and technological innovation capabilities of the coal slime flotation industry.

[0029] 2. This invention employs five flotation processes: roughing and purifying flotation, cleaning and purifying flotation, primary purifying flotation, secondary purifying flotation, and tertiary purifying flotation, to reduce the ash content of clean coal to below 2%. Attached Figure Description

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Figure 1 This is a flowchart of the production process of the present invention;

[0032] Figure 2 This is a diagram showing the layout of the lower-level structure equipment of the present invention;

[0033] Figure 3 This is a diagram showing the layout of the upper structure equipment of the present invention;

[0034] Figure 4 This is a vertical equipment layout diagram of the present invention.

[0035] In the diagram: 1-Filter press feed tank, 2-Tertiary purification flotation feed tank, 3-Secondary purification flotation feed tank, 4-Purification flotation machine tailings tank, 5-Cleaning feed tank, 6-Roughening feed tank, 7-Disc filter feed tank, 8-Sweeping pump, 9-Air-liquid separator, 10-Disc filter, 11-Fine grinding mill feed tank, 12-Fine grinding mill, 13-Ultrafine grinding mill, 14-Shaft seal water tank, 15-Ultrafine grinding mill feed tank, 16-Primary purification flotation feed tank, 17-Pulp pump, 18-Staircase, 19- 20-Secondary purification slurry preprocessor, 21-Concentrated slurry preprocessor, 22-Roughening slurry preprocessor, 23-Primary purification slurry preprocessor, 24-Third purification flotation machine, 25-Secondary purification flotation machine, 26-Concentrated purification flotation machine, 27-Roughening purification flotation machine, 28-Primary purification flotation machine, 29-Filter press, 30-Filter press outlet, 31-Clean coal loading trolley, 32-Coal slime water line, 33-Circulating water line, 34-Coal flow line. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1:

[0038] like Figures 1 to 4 As shown, a pilot production line for coal slime flotation is suitable for coal slime with high Al2O3 and SiO2 content. It includes a roughing flotation system, a cleaning flotation system, a grinding device, a primary purification flotation system, a secondary purification flotation system, a tertiary purification flotation system, a coal slime water system, and a kaolin production system connected in sequence. The production line adopts a double-layer structure, with the lower layer arranging the equipment for the coal slime flotation preparation stage and the upper layer arranging the equipment for the coal slime flotation stage.

[0039] The roughing flotation system includes a roughing purification flotation machine 27, the cleaning flotation system includes a cleaning purification flotation machine 26, the grinding device includes a disc filter 10, a fine grinding mill 12 and an ultrafine grinding mill 13, the primary purification flotation system includes a primary purification flotation machine 28, the secondary purification flotation system includes a secondary purification flotation machine 25, and the tertiary purification flotation system includes a tertiary purification flotation machine 24;

[0040] The roughing and purification flotation machine 27, the fine purification flotation machine 26, the disc filter 10, the primary purification flotation machine 28, the secondary purification flotation machine 25, and the tertiary purification flotation machine 24 are all located in the upper structure. The lower structure is equipped with the roughing feed tank 6, the fine feed tank 5, the disc filter feed tank 7, the primary purification flotation feed tank 16, the secondary purification flotation feed tank 3, the tertiary purification flotation feed tank 2, as well as the fine grinding mill feed tank 11 and the ultrafine grinding mill feed tank 11. The fine grinding mill 12 and the ultrafine grinding mill 13 are arranged through the upper and lower structures.

[0041] The front ends of the roughing and purification flotation machine 27, the cleaning and purification flotation machine 26, the primary purification flotation machine 28, the secondary purification flotation machine 25, and the tertiary purification flotation machine 24 are respectively connected to the corresponding roughing slurry preprocessor 22, cleaning slurry preprocessor 21, primary purification slurry preprocessor 23, secondary purification slurry preprocessor 20, and tertiary purification slurry preprocessor 19. The cleaning slurry preprocessor 21, primary purification slurry preprocessor 23, secondary purification slurry preprocessor 20, and tertiary purification slurry preprocessor are connected to the roughing feed tank 6, cleaning feed tank 5, ultrafine mill feed tank 11, primary purification flotation feed tank 16, and secondary purification flotation feed tank 3 via the slurry pump 17, and the coal slime in the above feed tanks is pumped into the corresponding preprocessor through the slurry pump 17.

[0042] It also includes a thickener, a filter press feed tank 1 and a filter press 29 connected in sequence. The thickener and the tertiary purification flotation feed tank 2 are connected by a slurry pump 17. The slurry pump 17 pumps the clean coal in the tertiary purification flotation feed tank 2 into the thickener and the filter press 29 for thickening and filtration in sequence to obtain clean coal with low ash content.

[0043] The roughing and purifying flotation machine 27, the fine purifying flotation machine 26, and the disc filter 10 are all connected to the coal slurry water system. The tailings coal processed by the roughing and purifying flotation machine 27, the fine purifying flotation machine 26, and the disc filter 10 enter the coal slurry water system.

[0044] The primary purification flotation machine 28, the secondary purification flotation machine 25, the tertiary purification flotation machine 24, the thickener, and the filter press 29 are all connected to the kaolin preparation system. The tailings processed by the primary purification flotation machine 28, the secondary purification flotation machine 25, and the tertiary purification flotation machine 24, as well as the filtrate processed by the thickener and the filter press 29, enter the kaolin preparation system.

[0045] Example 2:

[0046] like Figure 1 As shown, a pilot-scale production process for coal slime flotation, using the coal slime flotation pilot-scale production line disclosed in Example 1, includes:

[0047] S1. Coal flotation: Coal slime is first treated by the roughing slurry pre-processor 22. The treated coal slime enters the roughing purification flotation machine 27 for flotation. The tailings after flotation enter the original coal slime water system. The low-ash coal slime enters the roughing feed tank 6 and is pumped into the cleaning slurry pre-processor 21 by the corresponding slurry pump 17.

[0048] S2. Coal flotation: After being processed by the fine coal slurry pre-processor 21, the coal slime enters the fine coal flotation machine 26. After flotation, the tailings enter the original coal slime water system, and the low-ash coal slime enters the fine coal feed tank 5, which is then pumped into the disc filter 10 by the slurry pump 17.

[0049] S3. Filtration: After being filtered by the disc filter 10, the unfiltered slag enters the original coal slurry water system, and the filtered coal slurry enters the disc filter feed tank 7, which is then pumped into the fine grinding mill 12 by the slurry pump 17.

[0050] S4. Grinding: The fine grinding mill 12 / ultra-fine grinding mill 13 uses yttrium-stabilized zirconia beads. The fine grinding mill uses yttrium-stabilized zirconia beads with sizes of 50mm and 20mm, while the ultra-fine grinding mill 13 uses yttrium-stabilized zirconia beads with sizes of 20mm, 5mm, and 1mm. After being ground by the fine grinding mill 12, the coal slime enters the fine grinding mill feed tank 11 and is pumped into the ultra-fine grinding mill 13 by the slurry pump 17. After being ground by the ultra-fine grinding mill 13, it enters the ultra-fine grinding mill feed tank 15 and is then pumped into the primary purification slurry pre-processor 23 by the slurry pump 17.

[0051] S5. Flotation purification:

[0052] S51. After primary flotation purification, the pretreated coal slime enters the primary purification flotation machine 28. After flotation, the tailings enter the kaolin preparation system, and the clean coal enters the primary purification flotation feed tank 16. The slurry pump 17 pumps it into the secondary purification slurry preprocessor 20.

[0053] S52, Secondary flotation purification: The pretreated coal slime enters the secondary purification flotation machine 25. After flotation, the tailings enter the kaolin preparation system, and the clean coal enters the secondary purification flotation feed tank 3. The slurry pump 17 pumps it into the tertiary purification slurry preprocessor 19.

[0054] S53. After pretreatment, the coal enters the three-stage flotation machine. After flotation, the tailings enter the kaolin preparation system, and the clean coal enters the three-stage flotation feed tank 2. The slurry pump 17 pumps it into the outdoor thickener for processing.

[0055] S6. Concentration: The refined coal obtained by three flotation purifications is concentrated by a thickener. The overflow of the thickener enters the kaolin preparation system, and the low flow enters the feed tank 1 of the filter press. Then, the slurry pump 17 pumps it into the filter press 29.

[0056] S7. Filtration: The concentrated coal enters the filter press 29 for dewatering, producing coal with lower ash content. The filtrate enters the kaolin preparation system.

[0057] Technical effects:

[0058] product Yield (%) Ash content (%) Clean coal from a single flotation 44.17 5.37 Clean coal from secondary flotation 23.31 3.56 Coal from three flotation processes 12.85 1.88

[0059] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A pilot production line for coal slime flotation, characterized in that: It includes a roughing flotation system, a cleaning flotation system, a grinding device, a primary purification flotation system, a secondary purification flotation system, and a tertiary purification flotation system connected in sequence. The system includes a double-layer structure with upper and lower sections. The roughing flotation system includes a roughing purification flotation machine (27), the cleaning flotation system includes a cleaning purification flotation machine (26), the primary purification flotation system includes a primary purification flotation machine (28), the secondary purification flotation system includes a secondary purification flotation machine (25), and the tertiary purification flotation system includes a tertiary purification flotation machine (24). The roughing and purification flotation machine (27), the fine purification flotation machine (26), the primary purification flotation machine (28), the secondary purification flotation machine (25), and the tertiary purification flotation machine (24) are set in the upper structure and are respectively connected to the feed tank. The feed tank is set in the lower structure, and a slurry pump (17) is set between the feed tank and the next process. The grinding device includes a disc filter (10), a disc filter feed tank (7), a fine grinding mill (12), a fine grinding mill feed tank (11), an ultrafine grinding mill (13), and an ultrafine grinding mill feed tank (15) connected in sequence. A slurry pump (17) is installed between the disc filter feed tank (7) and the fine grinding mill (12), and between the fine grinding mill feed tank (11) and the ultrafine grinding mill (13). It also includes a coal slurry water system and a kaolin preparation system. The roughing and purification flotation machine (27), the fine purification flotation machine (26), and the disc filter (10) are all connected to the coal slurry water system. The primary purification flotation machine (28), secondary purification flotation machine (25), tertiary purification flotation machine (24), thickener and filter press (29) are all connected to the kaolin preparation system.

2. The pilot production line for coal slime flotation according to claim 1, characterized in that: The front ends of the roughing and purification flotation machine (27), the fine purification flotation machine (26), the primary purification flotation machine (28), the secondary purification flotation machine (25), and the tertiary purification flotation machine (24) are respectively connected to corresponding slurry preprocessors.

3. The pilot production line for coal slime flotation according to claim 2, characterized in that: It also includes a thickener, a filter press feed tank (1) and a filter press (29) connected in sequence. The thickener is connected to a three-stage purification flotation system. A slurry pump (17) is provided between the filter press feed tank (1) and the filter press (29).

4. A pilot-scale production process for coal slime flotation, employing the pilot-scale production line for coal slime flotation as described in claim 3, characterized in that, include: S1. Coal flotation: Coal slime is flotated by a coarse flotation purification flotation machine (27), and the low-ash coal slime enters the next process. S2, clean coal flotation, the low-ash coal slime after flotation enters the next process; S3. Filtration: Unfiltered slag enters the coal slurry water system, and the filtered coal slurry enters the next process. S4. Grinding: The coal slime is ground by a fine grinding mill (12) and an ultrafine grinding mill (13), and the ground coal slime enters the next process. S5. Flotation purification: The ground coal slime is successively purified by flotation through a primary purification flotation machine (28), a secondary purification flotation machine (25), and a tertiary purification flotation machine (24).

5. The pilot-scale production process for coal slime flotation according to claim 4, characterized in that, Also includes: S6. Concentration: The refined coal obtained by three flotation purifications is concentrated using a thickener. The overflow portion of the thickener enters the kaolin preparation system, and the low-flow portion enters the next process. S7. Filtration: The concentrated coal enters the filter press (29) for dewatering to obtain coal with lower ash content. The filtrate enters the kaolin preparation system.

6. The pilot production process for coal slime flotation according to claim 4, characterized in that: In S1 and S2, the tailings after flotation enter the coal slurry water system.

7. The pilot-scale production process for coal slime flotation according to claim 4, characterized in that: In S5, the tailings processed by the primary purification flotation machine (28), the secondary purification flotation machine (25), and the tertiary purification flotation machine (24) all enter the coal slurry water system.

Images