A device for preparing cold active oil bubbles using low-temperature plasma and a flotation method

Abstract

The present invention relates to a device and flotation method for preparing cold-state active oil bubbles using low-temperature plasma, belonging to the field of coal sorting and processing technology. It solves the safety issues caused by the need to heat high temperatures to achieve oil droplet gasification during the production of oil bubbles and the dispersion of oil droplets in the prior art, as well as the problems of high reagent consumption during the flotation process and poor flotation effect of low-rank coal. The present invention includes a collector delivery unit, an air delivery unit, and an ionization reaction device. The inner cavity of the ionization reaction device is divided from top to bottom into an upper ionization zone, an oil-gas mixing zone, and a lower ionization zone. The collector delivery unit is connected to the oil-gas mixing zone, the air delivery unit is connected to the upper ionization zone, and the upper ionization zone is connected to the lower ionization zone via an external pipeline. The present invention does not require the addition of additional surfactants, thereby reducing reagent consumption. It does not have a heating device and relies solely on the rapid flow of coal slurry in the bubble generator to shear the active oil and gas, thereby improving the quantity and quality of flotation clean coal.

Description

Technical Field

[0001] The present invention relates to the technical field of coal separation and processing, and in particular to a device for preparing cold-state active oil bubbles using low-temperature plasma, a flotation device and a flotation method. Background Art

[0002] my country boasts abundant recoverable coal reserves. As of 2021, national coal production reached 4.13 billion tons, with low-rank coal accounting for over 55% of the total. With increasing development intensity, the development and utilization of low-rank coal is gaining increasing attention. However, mechanized mining has led to a sharp increase in coal slime content and ash content, raising concerns within the industry about efficient flotation of low-rank coal slimes. Conventional flotation uses bubbles as a carrier for coal particles to float, with hydrocarbon oil collectors added directly to the coal slurry. However, due to the low degree of metamorphism, high surface oxygen functional groups, and extensive surface porosity of low-rank coal, its flotation properties are poor, making clean coal recovery difficult and resulting in resource waste. Furthermore, hydrocarbon oils can adsorb onto the surface of high-ash fine mud in the coal slurry, entering the clean coal froth layer through entrainment and encapsulation, causing contamination. To improve clean coal recovery, collector dosage must be increased, but this results in high flotation costs and difficulties in subsequent slime water treatment, impacting the economic benefits of coal enterprises.

[0003] Flotation studies on various difficult-to-separate minerals have shown that activated oil bubble flotation exhibits superior capture and selectivity compared to conventional flotation, proving to be a more effective technique. However, the production of oil bubbles and the dispersion of oil droplets require high temperatures to vaporize the droplets, which presents a number of safety risks in practice, significantly limiting the widespread application of oil bubble flotation. Furthermore, the heating and vaporization process precludes the use of water-soluble surfactants to avoid damage to the heating device. Summary of the Invention

[0004] In view of the above analysis, the embodiments of the present invention aim to provide a device, a flotation device and a flotation method for preparing active oil bubbles using low-temperature plasma, so as to solve the safety problems in the prior art caused by the need to heat high temperatures to achieve gasification of oil droplets during the production of oil bubbles and the dispersion of oil droplets, as well as the problems of high reagent consumption in the flotation process and poor flotation effect of low-rank coal.

[0005] On the one hand, the present invention provides a device for preparing active oil bubbles using low-temperature plasma, comprising a collector delivery unit, an air delivery unit, and an ionization reaction device. The inner cavity of the ionization reaction device is divided from top to bottom into an upper ionization zone, an oil-gas mixing zone, and a lower ionization zone. The collector delivery unit is connected to the oil-gas mixing zone, the air delivery unit is connected to the upper ionization zone, and the upper ionization zone is connected to the lower ionization zone through an external pipeline.

[0006] Furthermore, the collector delivery unit includes a collector storage and a collector delivery pipeline, one end of the collector delivery pipeline is connected to the collector storage, and the other end is connected to the oil-gas mixing zone.

[0007] Furthermore, a peristaltic pump and a first electromagnetic switch valve are provided in the collector delivery pipeline, and the first electromagnetic switch valve is provided upstream of the peristaltic pump.

[0008] Furthermore, the collector delivery pipeline is further provided with a liquid flow meter and a first flow regulating valve, and both the liquid flow meter and the first flow regulating valve are provided downstream of the peristaltic pump.

[0009] Furthermore, the air delivery unit includes an air compressor, an air storage tank and a gas delivery pipeline. The air compressor is connected to the air storage tank, and the air storage tank is connected to the upper ionization zone through the gas delivery pipeline.

[0010] Furthermore, the gas delivery pipeline is provided with a second electromagnetic switch valve, a gas flow meter, a second flow regulating valve and a pressure gauge.

[0011] On the other hand, the present invention provides a flotation device, including the above-mentioned device for preparing active oil bubbles by low-temperature plasma, and also including a bubble generator, a circulation pump and a flotation column, wherein the bubble generator is connected to the device for preparing active oil bubbles by low-temperature plasma, the circulation pump and the flotation column.

[0012] Furthermore, the oil and gas outlet of the ionization reaction device is connected to the oil and gas inlet of the bubble generator, the circulation pump is connected to the flotation column and the coal slurry inlet of the bubble generator, and the mixed liquid outlet of the bubble generator is connected to the flotation column.

[0013] Furthermore, the bubble generator is a Venturi tube.

[0014] In another aspect, the present invention provides a flotation method for active oil bubbles prepared using low-temperature plasma, using the above-mentioned flotation device, the steps comprising:

[0015] Step 1: transport compressed air to the upper ionization zone and transport collector to the oil-gas mixing zone;

[0016] Step 2: When the upper ionization zone is filled with compressed air, turn on the switch connecting the plasma power supply and the first rod-shaped high-voltage electrode to ionize the compressed air and generate primary ionized exhaust gas;

[0017] Step 3: Turn on the electromagnetic air pump to allow the primary ionization exhaust gas and oil-gas mixture to enter the lower ionization zone;

[0018] Step 4: After the lower ionization zone is filled with the primary ionized exhaust gas and the oil-gas mixture, turn on the switch connected to the plasma power supply and the second rod-shaped high-voltage electrode to ionize the primary ionized exhaust gas and the oil-gas mixture. The secondary ionization products enter the oil-gas mixing zone to form activated oil and gas.

[0019] Step 5: The active oil and gas are sucked into the bubble generator through the oil and gas outlet, and the circulating pump circulates the coal slurry at high speed to shear and generate oil bubbles, which are mineralized with the coal slurry and enter the flotation column.

[0020] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0021] (1) The low-temperature plasma ionization reactor of the present invention has two ionization zones, upper and lower, which can fully ensure the activity of oil and gas; no additional surfactant is required, reducing the consumption of reagents; there is no heating device, and only the rapid flow of coal slurry in the bubble generator is relied on to shear the active oil and gas, thereby efficiently generating stable active oil bubbles.

[0022] (2) Compared with traditional hydrocarbon collectors, the collector of the present invention, after being ionized and foamed by low-temperature plasma, has high dispersibility and strong stability in the ore pulp, which solves the problems of uneven dispersion caused by mechanical stirring and re-agglomeration after dispersion, and greatly reduces the amount of flotation collector used.

[0023] (3) Compared with traditional bubbles, the present invention has a better flotation mineralization effect of the active oil bubbles prepared by low-temperature plasma ionization. Because the oil bubbles have good dispersion and contain polar functional groups on the surface, not only the collision probability of mineral particles is increased, but also the polar groups can easily and firmly attach to the surface of low-rank coal, thereby improving the flotation effect and increasing the number and quality of flotation clean coal.

[0024] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0026] Figure 1 A schematic structural diagram of a device for preparing active oil bubbles using low-temperature plasma according to a specific embodiment;

[0027] Figure 2 Schematic diagram of the structure of a low-temperature plasma ionization reaction device according to a specific embodiment;

[0028] Figure 3 It is a structural schematic diagram of a flotation device according to a specific embodiment;

[0029] Figure 4 Schematic diagram of the structure of the bubble generator of a specific embodiment.

[0030] Reference numerals:

[0031] 1-collector delivery unit; 11-collector storage; 12-peristaltic pump; 13-first electromagnetic switch valve; 14-liquid flow meter; 15-first flow regulating valve;

[0032] 2-air delivery unit; 21-air compressor; 22-gas storage tank; 23-second electromagnetic switch valve; 24-gas flow meter; 25-second flow control valve; 26-pressure gauge;

[0033] 3- ionization reaction device; 31- upper ionization zone; 311- first air inlet; 32- oil-gas mixing zone; 321- oil inlet; 33- lower ionization zone; 34- first rod-shaped high-voltage electrode; 35- second rod-shaped high-voltage electrode; 36- ground electrode; 37- exhaust gas outlet; 38- second air inlet; 39- oil-gas outlet;

[0034] 4-plasma power supply; 5-electromagnetic air pump; 6-bubble generator; 61-oil and gas inlet; 62-coal slurry inlet; 63-mixed liquid outlet; 7-circulation pump; 8-flotation column. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0036] Example 1

[0037] A specific embodiment of the present invention, as Figure 1 As shown, a device for preparing active oil bubbles using low-temperature plasma is disclosed, comprising a collector delivery unit 1, an air delivery unit 2, and an ionization reaction device 3. The inner cavity of the ionization reaction device 3 is divided from top to bottom into an upper ionization zone 31, an oil-gas mixing zone 32, and a lower ionization zone 33. The collector delivery unit 1 is connected to the oil-gas mixing zone 32, the air delivery unit 2 is connected to the upper ionization zone 31, and the upper ionization zone 31 is connected to the lower ionization zone 33 via an external pipeline.

[0038] Compared with the prior art, the device for preparing active oil bubbles using low-temperature plasma in this embodiment has two upper and lower ionization zones to fully ensure the activity of oil and gas, does not require the addition of additional surfactants, reduces reagent consumption, has no heating device, and is highly safe.

[0039] Specifically, the oil-gas mixing zone 32 and the lower ionization zone 33 are isolated by a sand core.

[0040] The collector delivery unit 1 includes a collector storage 11 and a collector delivery pipeline. One end of the collector delivery pipeline is connected to the collector storage 11 , and the other end is connected to the oil-gas mixing area 32 .

[0041] Considering that the collector storage 11 needs to continuously and stably transport the collector downstream, a spherical float self-locking device is provided in the collector storage 11 to keep the liquid level in the collector storage 11 at an appropriate level.

[0042] In order to allow the collector in the collector storage 11 to enter the oil-gas mixing zone 32, a peristaltic pump 12 is provided in the collector delivery pipeline. In this embodiment, by providing the peristaltic pump 12 in the collector delivery pipeline, power is provided for the collector in the collector delivery pipeline, allowing it to smoothly enter the oil-gas mixing zone 32.

[0043] In order to facilitate the control of the on-off of the collector delivery pipeline, a first electromagnetic switch valve 13 is provided in the collector delivery pipeline, and the first electromagnetic switch valve 13 is provided upstream of the peristaltic pump 12. The first electromagnetic switch valve 13 controls the opening and closing of the collector delivery pipeline.

[0044] In order to facilitate the observation of the collector delivery volume in the collector delivery pipeline and the regulation of the collector delivery volume, a liquid flow meter 14 and a first flow regulating valve 15 are also provided in the collector delivery pipeline. The liquid flow meter 14 and the first flow regulating valve 15 are both provided downstream of the peristaltic pump 12.

[0045] In this embodiment, by setting a liquid flow meter 14 and a first flow regulating valve 15 in the collector delivery pipeline, the collector delivery amount in the collector delivery pipeline can be intuitively observed, and the amount of collector delivered to the oil-gas mixing zone 32 can be conveniently regulated.

[0046] In this embodiment, when it is necessary to transport the collector into the oil-gas mixing zone 32, the collector in the collector storage 11 passes through the first electromagnetic switch valve 13, the peristaltic pump 12, the liquid flow meter 14 and the first flow regulating valve 15 on the pipeline in sequence and enters the oil-gas mixing zone 32.

[0047] The air delivery unit 2 includes an air compressor 21, an air tank 22 and a gas delivery pipeline. The air compressor 21 is connected to the air tank 22 to compress the air and store it in the air tank 22. The air tank 22 is connected to the upper ionization zone 31 through the gas delivery pipeline.

[0048] In order to facilitate the control of the on-off of compressed air delivery in the gas delivery pipeline, a second electromagnetic switch valve 23 is provided in the gas delivery pipeline, and the second electromagnetic switch valve 23 controls the opening and closing of the gas delivery pipeline.

[0049] In order to facilitate the observation of the air delivery volume in the gas delivery pipeline and the regulation of the gas delivery volume, a gas flow meter 24 and a second flow regulating valve 25 are also provided in the gas delivery pipeline. The gas flow meter 24 and the second flow regulating valve 25 are both provided downstream of the second electromagnetic switch valve 23.

[0050] In order to facilitate observation of the pressure of the compressed air in the gas delivery pipeline, a pressure gauge 26 is further provided in the gas delivery pipeline. The pressure gauge 26 is provided downstream of the gas flow meter 24 and upstream of the second flow regulating valve 25 .

[0051] In this embodiment, by arranging a gas flow meter 24, a second flow regulating valve 25 and a pressure gauge 26 in the gas delivery pipeline, the air delivery volume and pipeline pressure in the gas delivery pipeline can be intuitively observed, and the amount of compressed air delivered to the upper ionization zone 31 can be conveniently regulated.

[0052] In this embodiment, the air compressor 21 generates compressed air which is stored in the air storage tank 22. When the compressed air needs to be transported to the upper ionization zone 31, the compressed air passes through the second electromagnetic switch valve 23, the gas flow meter 24, the pressure gauge 26 and the second flow regulating valve 25 on the gas delivery pipeline in sequence and enters the upper ionization zone 31.

[0053] like Figure 2 As shown, the ionization reaction device 3 also includes a first rod-shaped high-voltage electrode 34 and a second rod-shaped high-voltage electrode 35. The first rod-shaped high-voltage electrode 34 is inserted into the upper ionization zone 31, and the second rod-shaped high-voltage electrode 35 is inserted into the lower ionization zone 33. The first rod-shaped high-voltage electrode 34 and the second rod-shaped high-voltage electrode 35 are both in a vertical position. Preferably, the first rod-shaped high-voltage electrode 34 and the second rod-shaped high-voltage electrode 35 are vertically inserted in the middle of the cross-section of the upper ionization zone 31 and the lower ionization zone 33, respectively. It should be noted that the cross-section refers to the transverse cross-section of the main body of the ionization reaction device 3.

[0054] The ionization reaction device 3 further includes a ground electrode 36 . The outer side of the upper ionization zone 31 and the outer side of the lower ionization zone 33 are both provided with a ground electrode 36 .

[0055] The device for preparing active oil bubbles by low-temperature plasma also includes a plasma power supply 4, the positive pole of the plasma power supply 4 is connected to the first rod-shaped high-voltage electrode 34 and the second rod-shaped high-voltage electrode 35, and the negative pole of the plasma power supply 4 is connected to the ground electrode 36.

[0056] It should be noted that the plasma power supply 4 is provided with two switches, which are respectively connected to the first rod-shaped high-voltage electrode 34 and the second rod-shaped high-voltage electrode 35 .

[0057] To facilitate the input and output of various media, a first air inlet 311 is provided on the sidewall of the upper ionization zone 31, which is connected to a gas delivery pipeline. An oil inlet 321 is provided on the sidewall of the oil-gas mixing zone 32, which is connected to a collector delivery pipeline. An exhaust gas outlet 37 is provided at the top of the ionization reaction device 3, which is connected to the upper ionization zone 31. A second air inlet 38 is provided at the bottom of the ionization reaction device 3, which is connected to the lower ionization zone 33. The exhaust gas outlet 37 is connected to the second air inlet 38 via a gas delivery pipeline, which is equipped with an electromagnetic air pump 5. An oil and gas outlet 39 is provided on the sidewall of the ionization reaction device 3, which is connected to the inner cavity of the ionization reaction device 3 and is located at the junction of the upper ionization zone 31 and the oil-gas mixing zone 32.

[0058] Example 2

[0059] Another specific embodiment of the present invention is as follows Figure 1 and Figure 2 As shown, a method for preparing active oil bubbles using low-temperature plasma is disclosed. The device for preparing active oil bubbles using low-temperature plasma of Example 1 is used, and the steps include:

[0060] Step 1: delivering compressed air to the upper ionization zone 31 and delivering a collector to the oil-gas mixing zone 32 .

[0061] The first electromagnetic switch valve 13 in the collector delivery pipeline and the second electromagnetic switch valve 23 in the gas delivery pipeline are opened to allow the collector and dry compressed air to enter the low-temperature plasma ionization reaction device.

[0062] It is worth noting that the collector liquid level in the ionization reaction device 3 does not exceed the height of the oil and gas outlet 39 , and the dry air fills the upper ionization zone 31 .

[0063] Specifically, the collector storage 11 is connected to the oil inlet 321 of the low-temperature plasma ionization reaction device 3. Through the coordinated use of the liquid flow meter 14 and the first flow regulating valve 15, the collector enters the oil-gas mixing zone 32 through the oil inlet 321 in the collector delivery pipeline.

[0064] The air compressor 21 compresses the inhaled dry air and stores it in the gas storage tank 22. Through the coordinated use of the gas flow meter 24, the second flow regulating valve 25 and the pressure gauge 26 in the gas delivery pipeline, the pressurized dry air enters the upper ionization zone 31 through the first air inlet 311 of the low-temperature plasma ionization reaction device 3 in the gas delivery pipeline at an appropriate flow rate (40-60 mL / min).

[0065] Step 2: When the upper ionization zone 31 is filled with compressed air, turn on the switch connecting the plasma power supply 4 and the first rod-shaped high-voltage electrode 34 to ionize the compressed air and generate primary ionized waste gas. The high-energy particles generated by the ionized air activate the collector.

[0066] The output voltage of the plasma power supply 4 is 10-20 kV, the output current is 100-300 A, the output pulse frequency is 100-200 pulses per second, and the pulse duration is 5 ns.

[0067] Step 3: Turn on the electromagnetic air pump 5 to allow the primary ionized waste gas and the oil-gas mixture to enter the lower ionization zone 33 at a speed of 40 to 60 mL / min.

[0068] Step 4: After the lower ionization zone 33 is filled with the primary ionized exhaust gas and the oil-gas mixture, turn on the switch connecting the plasma power supply 4 and the second rod-shaped high-voltage electrode 35 to ionize the primary ionized exhaust gas and the oil-gas mixture. The secondary ionization products enter the oil-gas mixing zone 32 to form activated oil and gas.

[0069] The output voltage of the plasma power supply 4 is 10-20 kV, the output current is 100-300 A, the output pulse frequency is 100-200 pulses per second, and the pulse duration is 5 ns.

[0070] In this embodiment, the upper ionization zone 31 undergoes primary ionization to preliminarily activate the surface collector to produce activated oil and gas. The primary ionized exhaust gas and the oil and gas mixture are circulated into the lower ionization zone 33 through the electromagnetic air pump 5 for secondary ionization. The secondary ionized air is divided into bubbles by the bottom sand core and diffused in the oil and gas mixing zone 32, further activating the bulk collector to produce activated oil and gas.

[0071] Compared with traditional hydrocarbon collectors, the collector in this embodiment, after being foamed by low-temperature plasma ionization, has high dispersibility and strong stability in the ore pulp, solves the problems of uneven dispersion caused by mechanical stirring and re-agglomeration after dispersion, and greatly reduces the amount of flotation collector used.

[0072] Example 3

[0073] Another specific embodiment of the present invention is as follows Figure 3 and Figure 4 As shown, a flotation device is disclosed, including the device for preparing active oil bubbles using low-temperature plasma in Example 1, and also including a bubble generator 6, a circulation pump 7 and a flotation column 8. The oil and gas outlet 39 of the ionization reaction device 3 is connected to the oil and gas inlet 61 of the bubble generator 6, the circulation pump 7 is connected to the flotation column 8 and the coal slurry inlet 62 of the bubble generator 6, and the mixed liquid outlet 63 of the bubble generator 6 is connected to the flotation column 8.

[0074] In this embodiment, the oil-gas mixed liquid output from the ionization reaction device 3 enters the bubble generator 6 through the oil-gas inlet 61 , and is mixed with the coal slurry transported by the circulation pump 7 before entering the flotation column 8 .

[0075] Specifically, the bubble generator 6 is a venturi tube, and the throat of the venturi tube serves as the oil and gas inlet 61 .

[0076] Compared with the prior art, the flotation device of this embodiment has two upper and lower ionization zones to fully ensure the activity of oil and gas, does not require the addition of additional surfactants, reduces reagent consumption, has no heating device, and is highly safe. It only relies on the rapid flow of coal slurry in the bubble generator to shear the active oil and gas, thereby efficiently generating stable active oil bubbles.

[0077] Example 4

[0078] Another embodiment of the present invention, as Figure 3 and Figure 4 As shown, a flotation method for active oil bubbles prepared by low-temperature plasma is disclosed, using the flotation device of Example 3, the steps comprising:

[0079] Step 1: delivering compressed air to the upper ionization zone 31 and delivering a collector to the oil-gas mixing zone 32 .

[0080] The first electromagnetic switch valve 13 in the collector delivery pipeline and the second electromagnetic switch valve 23 in the gas delivery pipeline are opened to allow the collector and dry compressed air to enter the low-temperature plasma ionization reaction device.

[0081] It is worth noting that the collector liquid level in the ionization reaction device 3 does not exceed the height of the oil and gas outlet 39, and the dry air fills the upper ionization zone.

[0082] Specifically, the collector storage 11 is connected to the oil inlet 321 of the low-temperature plasma ionization reaction device 3. Through the coordinated use of the liquid flow meter 14 and the first flow regulating valve 15, the collector enters the oil-gas mixing zone 32 through the oil inlet 321 in the collector delivery pipeline.

[0083] The air compressor 21 compresses the inhaled dry air and stores it in the gas storage tank 22. Through the coordinated use of the gas flow meter 24, the second flow regulating valve 25 and the pressure gauge 26 in the gas delivery pipeline, the pressurized dry air enters the upper ionization zone 31 through the first air inlet 311 of the low-temperature plasma ionization reaction device 3 in the gas delivery pipeline at an appropriate flow rate (40-60 mL / min).

[0084] Step 2: Once the upper ionization zone 31 is filled with compressed air, the switch connecting the plasma power supply 4 to the first rod-shaped high-voltage electrode 34 is turned on to ionize the compressed air, generating primary ionized waste gas. The high-energy particles generated by the ionized air activate the collector. The plasma power supply 4 has an output voltage of 10-20 kV, an output current of 100-300 A, an output pulse frequency of 100-200 pulses per second, and a pulse duration of 5 ns.

[0085] Step 3: Turn on the electromagnetic air pump 5 to allow the primary ionized waste gas and the oil-gas mixture to enter the lower ionization zone 33 at a speed of 40 to 60 mL / min.

[0086] Step 4: After the lower ionization zone 33 is filled with the primary ionized exhaust gas and the oil-gas mixture, turn on the switch connecting the plasma power supply 4 and the second rod-shaped high-voltage electrode 35 to ionize the primary ionized exhaust gas and the oil-gas mixture. The secondary ionization products enter the oil-gas mixing zone 32 to form activated oil and gas.

[0087] The output voltage of the plasma power supply 4 is 10-20 kV, the output current is 100-300 A, the output pulse frequency is 100-200 pulses per second, and the pulse duration is 5 ns.

[0088] Step 5: The active oil and gas generated by ionization in the ionization reaction device 3 is sucked into the bubble generator 6 through the oil and gas outlet 39. The circulating pump 7 circulates the coal slurry at high speed to shear and generate oil bubbles, which are mineralized with the coal slurry and enter the flotation column 8.

[0089] Compared with traditional bubbles, the active oil bubbles prepared by low-temperature plasma ionization in this embodiment have a good flotation mineralization effect. Because the oil bubbles have good dispersion and contain polar functional groups on the surface, not only the collision probability of mineral particles is increased, but also the polar groups can easily and firmly attach to the surface of low-rank coal, thereby improving the flotation effect and increasing the number and quality of floated clean coal.

[0090] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A device for preparing active oil bubbles using low-temperature plasma, characterized in that: The invention comprises a collector delivery unit (1), an air delivery unit (2) and an ionization reaction device (3); the inner cavity of the ionization reaction device (3) is divided into an upper ionization zone (31), an oil-gas mixing zone (32) and a lower ionization zone (33) from top to bottom; the collector delivery unit (1) is connected to the oil-gas mixing zone (32); the air delivery unit (2) is connected to the upper ionization zone (31); and the upper ionization zone (31) is connected to the lower ionization zone (33) via an external pipeline; The ionization reaction device (3) comprises a first rod-shaped high-voltage electrode (34) and a second rod-shaped high-voltage electrode (35), wherein the first rod-shaped high-voltage electrode (34) is inserted into the upper ionization zone (31), and the second rod-shaped high-voltage electrode (35) is inserted into the lower ionization zone (33); the oil-gas mixing zone (32) and the lower ionization zone (33) are isolated by a sand core; The top of the ionization reaction device (3) is provided with an exhaust gas outlet (37) connected to the upper ionization zone (31), and the bottom of the ionization reaction device 3 is provided with a second air inlet (38) connected to the lower ionization zone (33), and the exhaust gas outlet (37) is connected to the second air inlet (38) through a gas pipeline.

2. The device for preparing active oil bubbles by low-temperature plasma according to claim 1, characterized in that: The collector delivery unit (1) comprises a collector storage (11) and a collector delivery pipeline, one end of the collector delivery pipeline is in communication with the collector storage (11), and the other end is in communication with the oil-gas mixing zone (32).

3. The device for preparing active oil bubbles by low-temperature plasma according to claim 2, characterized in that: A peristaltic pump (12) and a first electromagnetic switch valve (13) are provided in the collector delivery pipeline, and the first electromagnetic switch valve (13) is provided upstream of the peristaltic pump (12).

4. The device for preparing active oil bubbles using low-temperature plasma according to claim 3, characterized in that: A liquid flow meter (14) and a first flow regulating valve (15) are also provided in the collector delivery pipeline. The liquid flow meter (14) and the first flow regulating valve (15) are both provided downstream of the peristaltic pump (12).

5. The device for preparing active oil bubbles using low-temperature plasma according to any one of claims 1 to 4, characterized in that: The air delivery unit (2) comprises an air compressor (21), an air storage tank (22) and a gas delivery pipeline, wherein the air compressor (21) is connected to the air storage tank (22), and the air storage tank (22) is connected to the upper ionization zone (31) via the gas delivery pipeline.

6. The device for preparing active oil bubbles using low-temperature plasma according to claim 5, characterized in that: The gas delivery pipeline is provided with a second electromagnetic switch valve (23), a gas flow meter (24), a second flow regulating valve (25) and a pressure gauge (26).

7. A flotation device, characterized in that: The device for preparing active oil bubbles by low-temperature plasma comprises the device according to any one of claims 1 to 6, and further comprises a bubble generator (6), a circulation pump (7) and a flotation column (8), wherein the bubble generator (6) is connected to the device for preparing active oil bubbles by low-temperature plasma, the circulation pump (7) and the flotation column (8).

8. The flotation device according to claim 7, characterized in that The oil and gas outlet (39) of the ionization reaction device (3) is connected to the oil and gas inlet (61) of the bubble generator (6), the circulation pump (7) is connected to the flotation column (8) and the coal slurry inlet (62) of the bubble generator (6), and the mixed liquid outlet (63) of the bubble generator (6) is connected to the flotation column (8).

9. The flotation device according to claim 8, characterized in that The bubble generator (6) is a Venturi tube.

10. A flotation method for active oil bubbles prepared by low-temperature plasma, characterized in that: Using the flotation device according to any one of claims 7 to 9, the steps include: Step 1: delivering compressed air to the upper ionization zone (31) and delivering a collector to the oil-gas mixing zone (32); Step 2: When the upper ionization zone (31) is filled with compressed air, the switch connecting the plasma power supply (4) and the first rod-shaped high-voltage electrode (34) is turned on to ionize the compressed air and generate primary ionized waste gas; Step 3: Turn on the electromagnetic air pump (5) to allow the primary ionized waste gas and the oil-gas mixture to enter the lower ionization zone (33); Step 4: After the lower ionization zone (33) is filled with the primary ionized waste gas and the oil-gas mixture, the switch connecting the plasma power supply (4) and the second rod-shaped high-voltage electrode (35) is turned on to ionize the primary ionized waste gas and the oil-gas mixture, and the secondary ionization product enters the oil-gas mixing zone (32) to form activated oil and gas; Step 5: The active oil and gas are sucked into the bubble generator (6) through the oil and gas outlet (39), and the circulating pump (7) circulates the coal slurry at high speed to shear and generate oil bubbles, which are mineralized with the coal slurry and enter the flotation column (8).

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