A waste mineral oil recycling device capable of purifying waste water in waste mineral oil

Abstract

The application discloses a waste mineral oil recycling device capable of purifying waste water in waste mineral oil and relates to the technical field of waste water treatment. The waste mineral oil recycling device comprises a shell, a crushing assembly and a water injection port are arranged on the top end of the shell, a water feeding mechanism is arranged in the shell, the water feeding mechanism comprises a gas return box and a water feeding box, a gas return pipe is arranged on one side of the gas return box, a mixing mechanism is arranged in the shell, the mixing mechanism comprises a mixing bin and is provided with a discharge pipe at the bottom, a gas return layer is arranged below the shell, the gas return pipe is arranged between the gas return layer and the gas return box, a water mixing layer is arranged at the bottom of the gas return layer, an oil-water separation layer is arranged at the bottom of the water mixing layer, an oil separation layer is arranged at the bottom surface of the oil-water separation layer, and a plurality of heaters are arranged outside the oil separation layer. In the process of recycling waste mineral oil layer by layer, the waste water is recycled and reused, the problem of non-recyclability of light oil near the water boiling point is avoided, and the problem of accelerated blockage of the mineral solution conveying pipeline is avoided.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a waste mineral oil recycling device that can purify wastewater from waste mineral oil. Background Technology

[0002] Waste minerals contain a large amount of waste mineral oil. This type of waste mineral oil has a complex composition, including light oil, heavy oil, and some wastewater. In the process of recycling waste mineral oil from waste minerals, it is necessary to separate the light oil and heavy oil, and then carry out comprehensive utilization such as controlled pressure distillation, hydrogenation, and regeneration.

[0003] The patent specification with publication number CN114873825B discloses a waste mineral oil purification wastewater treatment device. This device crushes and compresses the coarse solid matter in the waste into fine solid matter, allowing the oil that has permeated into the coarse solid matter to come into contact with water. This causes the oil that has permeated into the coarse solid matter to be released and mixed to generate a waste solution. Through multiple separation and purification processes, the waste solution is separated into oil sludge, oil-water, oil-gas, and oil-water vapor to generate high-purity coking products, heavy oil, various medium-quality oils, light oils, and oil-gas. This allows the oil in the waste to be fully recovered, thereby purifying the waste and stripping off the water it contains to re-enter the circulation to form a closed-loop circulating water system. When this type of wastewater treatment device is in use, it first separates various oils from the waste mineral oil. During this process, the oil and water vapor generated continuously rises to the steam outlet at the top of the device. Then, this part of the vapor is connected to the return water distributor, where it is liquefied and injected back into the crushing and pressing chamber along with the liquid water therein, so as to achieve the reuse of wastewater. The shortcoming of this technical solution is that, since the oil extraction component is only used to extract liquid oil, the oil vapor generated during the heating process is mixed with the water vapor. The device does not separate the oil vapor in this mixed vapor, but instead returns it to the return water distributor. Subsequently, the oil and water mixed vapor liquefies after cooling in the return water distributor to form an oil-water mixture. This mixture is directly injected into the crushing and pressing chamber for use. Therefore, in the subsequent treatment of new coarse solids, the liquefied gaseous oil in the coarse solids that is recycled with water remains in a non-recoverable state. Summary of the Invention

[0004] The purpose of this invention is to provide a waste mineral oil recycling device that can purify wastewater from waste mineral oil. The technical problem to be solved is as follows: Existing waste mineral oil recycling devices have the problem of incomplete separation when separating oil from coarse solids.

[0005] The objective of this invention can be achieved through the following technical solutions: A waste mineral oil recycling device for purifying wastewater from waste mineral oil includes a shell. A crushing assembly and a water inlet are installed at the top of the shell. A water delivery mechanism is installed at the top of the shell's interior, comprising a return air box and a water delivery box. A return air pipe is installed on one side of the return air box, which is used to return the recovered purified water vapor to the water delivery box. A mixing mechanism is located below the water delivery mechanism inside the shell. The mixing mechanism includes a mixing chamber that rotates along the central axis of the shell and has a discharge pipe installed at its bottom. The mixing mechanism is used to mix the crushed waste minerals and purified water. A return air layer is located below the mixing mechanism in the shell. A return air pipe is installed between the return air layer and the return air box. A water mixing layer is located at the bottom of the return air layer. An oil-water separation layer is located at the bottom of the water mixing layer. An oil separation layer is located on the bottom surface of the oil-water separation layer. A heating ring cavity is located between the inner wall of the shell and the outer side of the oil separation layer. At least two heaters are evenly installed on the outer side of the heating ring cavity in the shell.

[0006] As a further embodiment of the present invention: a pump body is installed at the bottom of the housing, an electronic valve one is installed on one side of the pump body, and an air outlet pipe is provided on one side of the bottom of the oil-water separation layer and the mixed water layer of the housing, and an electronic valve two and an electronic valve three are installed on the two air outlet pipes in sequence.

[0007] As a further aspect of the present invention: the crushing assembly includes a crusher installed at the middle of the top of the housing, the top of the crusher is provided with a feed inlet, a crushing motor is installed on one side of the crusher, and a conveying hopper extending into the interior of the top of the housing is fixedly connected to the bottom of the crusher.

[0008] As a further embodiment of the present invention: the mixing mechanism further includes a secondary turntable disposed at the same level as the conveying hopper, the mixing chamber is installed in the middle of the secondary turntable, and a main turntable is installed between the bottom and the inside of the shell, a rotating motor is installed between the main turntable and the inner wall of the shell, the discharge pipe is equipped with an electrically controlled valve, and the bottom end extends into the interior of the oil separation layer.

[0009] As a further aspect of the present invention: the oil separation layer includes a heavy oil tank fixedly connected to the bottom of the interior of the housing, a primary filter membrane is provided at the top of the heavy oil tank, the control console of the heater is located on the outside of the housing, and the heating part extends through the housing to the outside of the heavy oil tank.

[0010] As a further embodiment of the present invention: the oil-water separation layer includes an oil separation chamber disposed at the top of the primary filter membrane, and a secondary filter membrane is disposed at the top of the oil separation chamber; the water mixing layer includes a water separation chamber disposed at the top of the secondary filter membrane, and a reverse osmosis membrane is disposed at the top of the water separation chamber.

[0011] As a further embodiment of the present invention: a water inlet cap is installed at the top of the water inlet, the bottom of the water inlet is connected to the water supply tank, the water supply mechanism further includes a vent pipe installed between the top of the water supply tank and the top of the return air tank, a water supply pipe connected to the mixing chamber is provided on one side of the bottom surface of the water supply tank, a water tank frame is provided between the bottom surface of the return air tank and the water supply tank, and the water tank frame is fixedly connected to the inner wall of the shell.

[0012] As a further embodiment of the present invention: a partition is fixedly connected inside the housing below the mixing mechanism, the return gas layer includes a water vapor chamber disposed between the top of the reverse osmosis membrane and the bottom surface of the partition, and the return gas pipe is installed between the water supply tank and the water vapor chamber, and both the bottom and the top penetrate and extend to the outside of the housing.

[0013] The beneficial effects of this invention are: This invention features a crushing assembly at the top of the housing, a water supply mechanism at the upper interior, and a mixing mechanism at the bottom of the water supply mechanism. A discharge pipe extending to the bottom of the housing is installed at the bottom of the mixing mechanism. Furthermore, an oil separation layer, an oil-water separation layer, a water mixing layer, and a gas return layer are sequentially arranged from bottom to top between the bottom of the mixing mechanism and the bottom surface of the housing. Multiple heaters are installed on the periphery of the oil separation layer. In use, coarse solid waste minerals are fed into the crushing assembly, and water is injected into the water supply mechanism. The fine solids formed after crushing, along with the injected water, enter the mixing mechanism and are... The mixture is rotated and mixed into a mineral solution, which is then transported to the oil separation layer and heated. Taking advantage of the different boiling points of light and heavy oils and water in the mineral solution, and with the step-by-step sieving of each filter membrane, the heavy oil, light oil, and wastewater containing impurities in the mineral solution are sequentially sieved out until the purified water vapor is sieved into the water vapor chamber of the return gas layer. That is, the wastewater vapor generated during the oil fractionation of the mineral solution is separated into wastewater vapor and purified water vapor as it moves upward layer by layer, thereby realizing the purification and recovery function of wastewater in the mineral solution during the recycling of waste mineral oil. This invention collects purified water vapor and then returns it to the return gas box via a return gas pipe. From there, it is transferred to the water supply tank and condensed. This condensed vapor, along with subsequently generated waste mineral pulverizers, re-enters the mixing mechanism, thus recycling the purified water. Its technical advantage lies in the fact that the mixed vapor formed during the heated fractionation of the mineral solution contains both water vapor containing impurities and oil vapor from light oils with boiling points close to water. Removing the impurities and oil vapors from this mixed vapor effectively prevents the accumulation of unremovable light oil vapor during repeated cycles. In other words, it improves the recovery rate of light oil in mineral recovery, avoiding the non-recoverable situation of light oils with boiling points close to water. Furthermore, it prevents the purified water in the water supply mechanism from gradually turning into an oil-water mixture, which, when mixed with waste mineral pulverizers, accelerates the increase in viscosity of the mineral solution, affecting the smoothness of the mineral solution's transport to the oil separation layer. This avoids the problem of accelerated blockage in the mineral solution transport pipeline. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a partial half-sectional view of the present invention; Figure 4 This is the present invention. Figure 3 Enlarged detail view of point A in the middle; Figure 5 This is the present invention. Figure 3 A magnified view of the central section; Figure 6 This is the present invention. Figure 3 A close-up view of the bottom section.

[0016] In the diagram: 1. Shell; 2. Crushing assembly; 21. Crusher; 22. Feed inlet; 23. Crushing motor; 24. Conveying hopper; 3. Water inlet; 4. Water supply mechanism; 41. Air return box; 42. Water supply tank; 43. Vent pipe; 44. Water supply pipe; 45. Air return pipe; 46. Water tank frame; 5. Mixing mechanism; 51. Mixing bin; 52. Discharge pipe; 53. Slave turntable; 54. Main turntable; 55. Rotary motor; 56. 6. Electric control valve; 7. Return gas layer; 8. Steam chamber; 9. Mixing water layer; 10. Water distribution chamber; 11. Reverse osmosis membrane; 12. Oil-water separation layer; 13. Oil distribution chamber; 14. Secondary filter membrane; 15. Oil distribution layer; 16. Heavy oil chamber; 17. Primary filter membrane; 18. Heating ring chamber; 19. Heater; 10. Pump body; 11. Electronic valve one; 12. Gas outlet pipe; 13. Electronic valve two; 14. Electronic valve three; 15. Water inlet cover; 16. Partition plate. Detailed Implementation

[0017] 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.

[0018] like Figures 1 to 6 As shown, a waste mineral oil recycling device for purifying wastewater from waste mineral oil includes a shell 1. A crushing component 2 and a water inlet 3 are installed at the top of the shell 1. A water delivery mechanism 4 is installed at the top inside the shell 1. The water delivery mechanism 4 includes a return air box 41 and a water delivery box 42. The return air box 41 is used to return the recovered purified water vapor to the water delivery box 42. A mixing mechanism 5 is set below the water delivery mechanism 4 inside the shell 1. The mixing mechanism 5 includes a mixing chamber 51 connected to the bottom of the crushing component 2. The mixing chamber 51 rotates along the central axis of the shell 1. A discharge pipe 52 is installed at the bottom of the mixing chamber 51. The mixing mechanism 5 is used to mix the crushed waste minerals and purified water. A return air layer 6 is set below the mixing mechanism 5 in the shell 1. A water mixing layer 7 is set at the bottom of the return air layer 6. An oil-water separation layer 8 is set at the bottom of the water mixing layer 7. An oil separation layer 9 is set on the bottom surface of the oil-water separation layer 8. A heating ring cavity 10 is set between the inner wall of the shell 1 and the outer side of the oil separation layer 9. Three heaters 11 are evenly installed on the outer side of the heating ring cavity 10 in the shell 1. It should be noted that three feet are evenly fixedly connected to the bottom edge of the casing 1. A pump body 12 is installed at the bottom of the casing 1, and an electronic valve 13 is installed on one side of the pump body 12. The pump body 12 is preferably a reciprocating pump capable of conveying different media and different viscosities. The top of the pump body 12 extends through the bottom of the casing 1 into the oil separation layer 9, so as to cooperate with the electronic valve 13 to discharge heavy oil and sludge in the oil separation layer 9, which is convenient for subsequent fractionation. At the same time, the casing 1 is provided with a foot support on one side of the bottom of the oil-water separation layer 8 and the mixed water layer 7. The device has an exhaust pipe 14, and two exhaust pipes 14 are equipped with electronic valves 15 and 16 in sequence to control the discharge of internal oil and water vapor. In addition, this device performs preliminary fractionation of waste mineral oil in waste minerals, that is, separates waste mineral oil into sludge and heavy oil, light oil, wastewater and clean water. The clean water will be recycled and reused. The sludge, heavy oil, light oil and wastewater will be further finely fractionated after being discharged under the control of the three electronic valves. A top cover is provided at the top of the shell 1.

[0019] like Figures 1 to 4 As shown, the crushing assembly 2 includes a crusher 21 installed at the top center of the housing 1. The crusher 21 has a feed inlet 22 at its top and a crushing motor 23 installed on one side of the crusher 21. The bottom of the crusher 21 is fixedly connected to a conveying hopper 24 extending into the top of the housing 1. It should be noted that the crusher 21 includes an internal main crushing roller and a driven crushing roller. The output end of the crushing motor 23 is connected to one end of the main crushing roller. When in use, coarse solid waste minerals are fed into the crusher 21 through the feed inlet 22, and the crushing motor 23 is started. The crushing motor 23 drives the main crushing roller and transmits it to the driven crushing roller, crushing the fed waste minerals into fine solids, which then fall into the mixing bin 51 along the conveying hopper 24. like Figure 2 , Figure 3 and Figure 5 As shown, the mixing mechanism 5 also includes a secondary turntable 53 located at the same level as the conveying hopper 24, a mixing chamber 51 installed in the middle of the secondary turntable 53, a main turntable 54 installed between the bottom of the mixing chamber 51 and the inside of the housing 1, a rotating motor 55 installed between the main turntable 54 and the inner wall of the housing 1, and an electric control valve 56 installed on the discharge pipe 52, with its bottom end extending into the oil separation layer 9. It should be noted that the turntable 53 includes an inner rotating ring fixedly connected to the top side of the mixing chamber 51. Roller balls are evenly arranged on the outer side of the inner rotating ring. The outer rotating ring is rolled between the outer sides of each roller ball. The outer side of the outer rotating ring is fixedly connected to the inside of the housing 1. The main turntable 54 includes an inner rotating gear ring fixedly connected to the bottom side of the mixing chamber 51. Roller balls are evenly arranged on the outer side of the inner rotating gear ring. The outer rotating ring is rolled between the outer sides of each roller ball. The outer side of the outer rotating ring is fixedly connected to the inside of the housing 1. A support frame is fixedly connected to the bottom surface of the inner rotating gear ring. The bottom surface of the mixing chamber 51 is fixedly connected to the top of the support frame. The rotating motor 55 is fixedly connected to the adjacent side of the inner wall of the housing 1, and a drive gear is installed at the output end. The drive gear meshes with the inner rotating gear ring. Specifically, when the rotating motor 55 rotates, it drives the inner rotating gear ring on the inner side of the main turntable 54 to rotate. The top of the inner rotating gear ring is fixedly connected to the mixing chamber 51, thereby driving the mixing chamber 51 to rotate. At the same time, the rotation of the mixing chamber 51 drives the rotation of the auxiliary turntable 53 at the top. Thus, the mixing chamber 51 can achieve stable rotation inside the shell 1. The water supply mechanism 4 is installed between the crushing component 2 and the mixing mechanism 5. After receiving the crushed fine mineral solids and the clean water provided by the water supply mechanism 4, the mixing mechanism 5 can uniformly mix the two in the mixing chamber 51 to form a mineral solution. Finally, it is transported to the oil separation layer 9 along the bottom discharge pipe 52. The transportation process is controlled by the electric control valve 56.

[0020] like Figure 2 , Figure 3 and Figure 6 As shown, the oil separation layer 9 includes a heavy oil tank 91 fixedly connected to the bottom of the inside of the housing 1. A primary filter membrane 92 is fixedly connected to the top of the heavy oil tank 91. The control console of the heater 11 is located on the outside of the housing 1, and the heating part extends through the housing 1 to the outside of the heavy oil tank 91. It should be noted that the mineral solution falling from the discharge pipe 52 is heated by adjusting the control console of each heater 11 on the outside of the shell 1. Since the mineral solution has not been fractionated, it contains sludge, heavy oil, light oil and wastewater formed after crushing and mixing. The primary filter membrane 92 is preferably an SBAD-1 composite membrane, which can effectively trap the heavy oil with a higher boiling point in the light oil and is used to filter and separate the light oil and heavy oil. Specifically, since the boiling point of heavy oil is higher than that of light oil, after the heater 11 is adjusted to a suitable temperature, the light oil and water in the mineral solution can be continuously vaporized, while the sludge and heavy oil with a higher boiling point are screened and retained in the oil separation layer 9 and discharged by the pump body 12 controlled by the electronic valve 13.

[0021] The oil-water separation layer 8 includes an oil separation chamber 81 disposed at the top of the primary filter membrane 92, and the top of the oil separation chamber 81 is fixedly connected to the secondary filter membrane 82. The water mixing layer 7 includes a water separation chamber 71 disposed at the top of the secondary filter membrane 82, and the top of the water separation chamber 71 is fixedly connected to the reverse osmosis membrane 72. It should be noted that after the heater 11 heats and vaporizes the light oil and wastewater in the oil separation layer 9, the water-oil vapor enters the oil-water separation layer 8 through the primary filter membrane 92. After accumulating there, the water-oil vapor rises to the secondary filter membrane 82. The secondary filter membrane 82 is preferably a PVDF composite membrane, which is used to separate the water-oil mixture and has hydrophilic and oleophobic properties. This leaves the light oil vapor in the oil separation chamber 81 and discharges it through the vent pipe 14 controlled by the electronic valve 15. The water vapor in the water-oil mixture enters the water mixing layer 7 through the secondary filter membrane 82. The reverse osmosis membrane 72 is used to screen the purified water and wastewater in the upward water vapor. When the upward water vapor flows on the surface of the reverse osmosis membrane 72, water molecules will pass through the micropores smaller than one nanometer on the membrane surface. Impurities such as heavy metal ions in the water are blocked by the reverse osmosis membrane 72 in the water separation chamber 71. The purified water vapor passes through the reverse osmosis membrane 72 and moves upward to the return gas layer 6. That is, the gas outlet pipe 14 on the oil-water separation layer 8 discharges light oil vapor, and the gas outlet pipe 14 on the mixed water layer 7 discharges the wastewater vapor in the separated water. The purified water vapor in the separated water moves upward to the return gas layer 6. In addition, the reverse osmosis membrane 72, the secondary filter membrane 82 and the primary filter membrane 92 are all attached to a plate with pores, and the heating temperature of the heater 11 to the heating ring cavity 10 is always above the boiling point of light oil and below the boiling point of heavy oil. Since the oil separation layer 9, the oil-water separation layer 8, the mixed water layer 7 and the return gas layer 6 are connected in sequence, the upward heat transfer can keep the vapor in each layer above the oil separation layer 9 in a gaseous state, so as to cooperate with the continuous fractionation of each screening membrane.

[0022] like Figures 2 to 5 As shown, a water inlet cap 17 is installed at the top of the water inlet 3 at the top of the shell 1. The bottom of the water inlet 3 is connected to the water supply tank 42. The water supply mechanism 4 also includes a vent pipe 43 installed between the top of the water supply tank 42 and the top of the return air tank 41. A water supply pipe 44 connected to the mixing chamber 51 is provided on one side of the bottom surface of the water supply tank 42. A return air pipe 45 is connected between one side of the water supply tank 42 and the return air layer 6. A water tank frame 46 is provided on the bottom surface of the return air tank 41 and the water supply tank 42. The water tank frame 46 is fixedly connected to the inner wall of the shell 1. Inside the housing 1, a partition 18 is fixedly connected below the mixing mechanism 5. The return gas layer 6 includes a water vapor chamber 61 disposed between the top of the reverse osmosis membrane 72 and the bottom of the partition 18. The return gas pipe 45 is installed between the water supply tank 42 and the water vapor chamber 61, and extends through the housing 1 to the outside of the housing 1 at both the bottom and top. It should be noted that the return gas pipe 45 is set as a U-shape partially located on the outside of the shell 1. The purpose is to avoid the return pipe interfering with the rotation and mixing process of the mixing mechanism 5 inside the shell 1. After the purified water vapor is returned to the return gas box 41 through the return gas pipe 45, it diffuses into the water supply box 42 through the vent pipe 43 connected to the top of the return gas box 41. Since the water filling cover 17 is used to connect an external water filling pipe (not shown) to fill water into the water supply box 42, the water body is at room temperature, which causes the hot steam in the return gas box 41 to convect into the water supply box 42 and condense. It is then transported to the mixing chamber 51 along with the water supply pipe 44. The fine solids and purified water are uniformly mixed with the rotation of the mixing mechanism 5 to prepare a mineral solution that is easy to fractionate later. In this process, the purified water in the mineral solution used previously is recycled and reused. In addition, the wastewater vapor discharged from one side of the water distribution tank 71 can be purified by an external flotation tank (existing technology) to remove impurities, and then re-injected into the water supply tank 42 through the water inlet pipe of the water inlet cover 17 for recycling, thereby improving the effect of wastewater purification, recycling and reuse.

[0023] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A waste mineral oil recycling device capable of purifying wastewater from waste mineral oil, comprising a shell (1), wherein a crushing assembly (2) and a water inlet (3) are installed at the top of the shell (1), characterized in that, A water delivery mechanism (4) is installed at the top of the interior of the housing (1). The water delivery mechanism (4) includes a return air box (41) and a water delivery box (42). A return air pipe (45) is installed on one side of the return air box (41). The return air box (41) is used to return the recovered purified water vapor to the water delivery box (42). A mixing mechanism (5) is provided inside the housing (1) below the water delivery mechanism (4). The mixing mechanism (5) includes a mixing chamber (51). The mixing chamber (51) rotates along the central axis of the housing (1) and a discharge pipe (52) is installed at the bottom. The mixing mechanism (5) is used for mixing. Crushed waste minerals and purified water; the shell (1) is provided with a return air layer (6) below the mixing mechanism (5), the return air pipe (45) is installed between the return air layer (6) and the return air box (41), the bottom of the return air layer (6) is provided with a water mixing layer (7), the bottom of the water mixing layer (7) is provided with an oil-water separation layer (8), the bottom surface of the oil-water separation layer (8) is provided with an oil separation layer (9), the inner wall of the shell (1) is provided with a heating ring cavity (10) between the outer side of the oil separation layer (9), and at least two heaters (11) are evenly installed on the outer side of the heating ring cavity (10) of the shell (1).

2. The waste mineral oil recycling device for purifying wastewater from waste mineral oil according to claim 1, characterized in that, A pump body (12) is installed at the bottom of the housing (1). An electronic valve (13) is installed on one side of the pump body (12). An air outlet pipe (14) is provided on one side of the bottom of the oil-water separation layer (8) and the mixed water layer (7) of the housing (1). An electronic valve (2) and an electronic valve (3) are installed on the two air outlet pipes (14) in sequence.

3. The waste mineral oil recycling device for purifying wastewater from waste mineral oil according to claim 1, characterized in that, The crushing assembly (2) includes a crusher (21) installed at the top center of the housing (1), a feed inlet (22) is provided at the top of the crusher (21), a crushing motor (23) is installed on one side of the crusher (21), and a conveying hopper (24) extending to the inside of the top of the housing (1) is fixedly connected to the bottom of the crusher (21).

4. The waste mineral oil recycling device for purifying wastewater from waste mineral oil according to claim 3, characterized in that, The mixing mechanism (5) also includes a secondary turntable (53) located at the same level as the conveying hopper (24), the mixing chamber (51) is installed in the middle of the secondary turntable (53), and a main turntable (54) is installed between the bottom and the inside of the shell (1). A rotating motor (55) is installed between the main turntable (54) and the inner wall of the shell (1). An electric control valve (56) is installed on the discharge pipe (52), and its bottom end extends into the inside of the oil separation layer (9).

5. The waste mineral oil recycling device for purifying wastewater from waste mineral oil according to claim 1, characterized in that, The oil separation layer (9) includes a heavy oil tank (91) fixedly connected to the bottom of the interior of the housing (1). A primary filter membrane (92) is provided at the top of the heavy oil tank (91). The control console of the heater (11) is located outside the housing (1), and the heating part extends through the housing (1) to the outside of the heavy oil tank (91).

6. The waste mineral oil recycling device for purifying wastewater from waste mineral oil according to claim 5, characterized in that, The oil-water separation layer (8) includes an oil separation chamber (81) disposed at the top of the primary filter membrane (92), and a secondary filter membrane (82) disposed at the top of the oil separation chamber (81). The water mixing layer (7) includes a water separation chamber (71) disposed at the top of the secondary filter membrane (82), and a reverse osmosis membrane (72) disposed at the top of the water separation chamber (71).

7. The waste mineral oil recycling device for purifying wastewater from waste mineral oil according to claim 1, characterized in that, A water inlet cap (17) is installed at the top of the water inlet (3). The bottom of the water inlet (3) is connected to the water delivery tank (42). The water delivery mechanism (4) also includes a vent pipe (43) installed between the top of the water delivery tank (42) and the top of the return air tank (41). A water delivery pipe (44) connected to the mixing chamber (51) is provided on one side of the bottom surface of the water delivery tank (42). A water tank frame (46) is provided between the bottom surface of the return air tank (41) and the bottom surface of the water delivery tank (42). The water tank frame (46) is fixedly connected to the inner wall of the shell (1).

8. A waste mineral oil recycling device for purifying wastewater from waste mineral oil according to claim 6, characterized in that, Inside the housing (1), a partition (18) is fixedly connected below the mixing mechanism (5). The return gas layer (6) includes a water vapor chamber (61) disposed between the top of the reverse osmosis membrane (72) and the bottom of the partition (18). The return gas pipe (45) is installed between the water supply tank (42) and the water vapor chamber (61), and both the bottom and top of the pipe extend through and to the outside of the housing (1).

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