An oil-water separator for precisely separating a paraffin oil-water-extractant mixture

Abstract

The present invention discloses an oil-water separator for precisely separating a paraffin oil-water-extractant mixture. The oil-water separator includes a centrifuge, a first separator sub-tank, a second separator sub-tank, a paraffin oil recovery tank, a waste water recovery tank, and an extractant recovery tank, which are respectively connected to the main separator tank. The inner cavity of the main separator tank is divided into a paraffin oil upper cavity, a middle cavity, and an extractant lower cavity by two layers of inclined filters. The middle cavity is connected to the centrifuge, the first separator sub-tank, the second separator sub-tank, and the waste water recovery tank. The paraffin oil upper cavity is connected to the first separator sub-tank and the paraffin oil recovery tank. The extractant lower cavity is connected to the second separator sub-tank and the extractant recovery tank. The present invention uses a centrifuge to separate three liquids with different densities. After the separated liquid flows into the main separator tank, the liquid is separated by two layers of inclined filters. There is some mixed liquid in all three layers of liquid. Then, the precise separation of the oil-water mixture is achieved through the separator sub-tank, and finally, the recovery and reuse of waste water and waste oil are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery separator production, and more specifically to an oil-water separator for precisely separating a paraffin oil-water-extractant mixture. Background Art

[0002] Under the background of global warming, each country should actively assume the international responsibility of energy conservation and emission reduction. Reducing emissions and protecting the environment are the requirements of our people-oriented development concept and the inherent requirements of our sustainable development. Currently, the company's two wet diaphragm production lines both use a complete set of production equipment from Toshiba of Japan. Mainly, PE powder and the pore-forming agent paraffin oil are stirred and kneaded, and under the action of torque, high temperature, and high pressure, it presents as a high-temperature resin, and then the resin is extruded; then it goes through MDO, TDO1 to the extraction process. The wet method is also called the solvent extraction pore-forming method, and its chemical principle is phase separation. The basic process is to extract the pore-forming agent from the pores of the oil film to form micropores that can allow lithium-ion batteries to pass through; in order to avoid environmental pollution and cost waste caused by the volatilization of the extractant at the inlet of this process, soft water is used for water sealing, so a mixed liquid of extractant-water-paraffin oil is produced. Usually, the static separation method, gravity separation method, and centrifugation method are used to separate the mixed liquid, but the traditional separation methods cannot precisely separate the three liquids, resulting in great waste.

[0003] With the increase in the production line speed and the continuous construction of the second and third phases of the project, more mixed liquid of extractant-water-paraffin oil will be produced in several workshops in the future, which not only affects the environment but also causes great waste of resources. At the same time, it will also directly affect the implementation of other environmental protection requirements and policies such as the company's environmental impact assessment. Summary of the Invention

[0004] The purpose of the present invention is to provide an oil-water separator for precisely separating a paraffin oil-water-extractant mixture to solve the problems existing in the prior art. The paraffin oil, extractant, and wastewater separated by this oil-water separator can be directly recycled, thereby achieving energy conservation and emission reduction, reducing production costs, and improving the production efficiency of the enterprise.

[0005] The purpose of the present invention is solved by the following technical solutions:

[0006] An oil-water separator for precisely separating a paraffin oil-water-extractant mixture, characterized in that: the oil-water separator includes a centrifuge, a first separator sub-tank, a second separator sub-tank, a paraffin oil recovery tank, a waste water recovery tank, and an extractant recovery tank, which are respectively connected to the main separator tank. The inner cavity of the main separator tank is divided into a paraffin oil upper cavity, a middle cavity, and an extractant lower cavity by two layers of inclined filters. The middle cavity is connected to the centrifuge, the first separator sub-tank, the second separator sub-tank, and the waste water recovery tank. The paraffin oil upper cavity is connected to the first separator sub-tank and the paraffin oil recovery tank. The extractant lower cavity is connected to the second separator sub-tank and the extractant recovery tank. The inclined filter is composed of a super-hydrophilic-super-hydrophobic foam ceramic material with a pore size of 48-60nm and a porosity of more than 93%. At the bottom of the inner cavity of the centrifuge, a buffer filter and a horizontal centrifugal drive mechanism with a drum filter above the buffer filter are arranged. The buffer filter and the drum filter are composed of a super-hydrophilic-super-hydrophobic foam ceramic material with a pore size of 5-10nm and a porosity of more than 93%. Under the action of the centrifuge, the paraffin oil-water-extractant mixture passes through the high-speed rotating drum filter, causing the liquids with the same density to continuously aggregate and form a dispersion liquid with different densities. Then, under the action of the buffer filter, the dispersion liquid is buffered and stratified. After that, the stratified liquid is transported to the main separator tank for primary separation. Under the action of gravity, the liquid with a lower density in the stratified liquid in the main separator tank passes through the upper inclined filter and is filtered and output to the paraffin oil upper cavity, and the generated paraffin oil is directly sent to the paraffin oil recovery tank. The liquid with a higher density passes through the lower inclined filter and is filtered and output to the extractant lower cavity, and the generated extractant is directly sent to the extractant recovery tank. The waste water remaining in the middle cavity is sent to the waste water recovery tank to obtain the recovery liquids of paraffin oil, waste water, and extractant. In the initial stage of operation, when the stratified liquid is insufficient, part of the paraffin oil-waste water flows out of the middle cavity to the first separator sub-tank for secondary separation of paraffin oil and waste water, and part of the waste water-extractant flows out of the middle cavity to the second separator sub-tank for secondary separation of waste water and extractant. In the later stage of operation, when the discharge rate of waste water is less than the discharge rates of paraffin oil and extractant, part of the paraffin oil-waste water flows out through the paraffin oil upper cavity to the first separator sub-tank for secondary separation of paraffin oil and waste water, and part of the waste water-extractant flows out through the extractant lower cavity to the second separator sub-tank for secondary separation of waste water and extractant.

[0007] An upper inclined filter is arranged in the upper part of the inner cavity of the main separator tank, and a lower inclined filter is arranged in the lower part of the inner cavity. An upper inclined filter is arranged in the lower part of the inner cavity of the first separator sub-tank, and a lower inclined filter is arranged in the upper part of the inner cavity of the second separator sub-tank. The inclined filter includes a tempered glass disc, an upper inclined cylindrical filter, and a lower inclined cylindrical filter. The upper inclined cylindrical filter is fixedly connected to the lower inclined cylindrical filter through the tempered glass disc, and a soft connection is used at the interface of the inclined filter.

[0008] An automatic switch for the paraffin oil pipeline is arranged at the outlet of the upper cavity of the paraffin oil. An automatic switch for the paraffin oil pipeline and an automatic switch for the extractant pipeline are respectively arranged at the outlet of the middle cavity. An automatic switch for the extractant pipeline is arranged at the outlet of the lower cavity of the extractant. The automatic switch for the paraffin oil pipeline includes a first dividing disc, a first buffer spring, a first support frame, and a first density ball. The first buffer spring is embedded in the grooves on both sides of the first dividing disc, and the upper end of the first buffer spring is welded and fixed to the first dividing disc. The lower end of the first buffer spring is fixedly connected to the upper end of the first support frame. The lower ends of the two first support frames are fixedly welded to the first density ball. The first dividing disc, the first support frame, and the first density ball are all made of polyethylene with a density of 0.94 - 0.97 g / cm 3 ³. The first buffer spring is made of fiberglass. The first density ball drives the lifting change of the first dividing disc with the change of the boundary of the mixed liquid, realizing the function of the automatic switch. The automatic switch for the extractant pipeline includes a second dividing disc, a second buffer spring, a second support frame, and a second density ball. The second buffer spring is embedded in the grooves on both sides of the second dividing disc, and the upper end of the second buffer spring is welded and fixed to the second dividing disc. The lower end of the second buffer spring is fixedly connected to the upper end of the second support frame. The lower ends of the two second support frames are fixedly welded to the second density ball. The second dividing disc, the second support frame, and the second density ball are all made of plexiglass with a density of 1.18 - 1.19 g / cm 3 ³. The second buffer spring is made of fiberglass. The second density ball drives the lifting change of the second dividing disc with the change of the boundary of the mixed liquid, realizing the function of the automatic switch.

[0009] Filter membrane structures are arranged at the outlet of the centrifuge, the inlets of the main tank of the separator, the first secondary tank of the separator, the second secondary tank of the separator, the inlet of the paraffin oil recovery tank, the inlet of the wastewater recovery tank, and the inlet of the extractant recovery tank. The filter membrane structure is made by laying three filter membranes with pore sizes of 0.05 μm, 0.50 μm, and 2 μm together and wrapping and fixing them with a tempered glass fixing ring. The purpose is to fix it at the pipe inlet and outlet to filter impurities in the liquid. The filter membrane structure at the outlet of the centrifuge can filter more than 85.00% of the impurities. The filter membrane structure at the inlet of the main tank of the separator can filter more than 89.00% of the impurities. The filter membrane structure at the inlet of the first secondary tank of the separator can filter more than 92.00% of the impurities. The filter membrane structure at the inlet of the second secondary tank of the separator can filter more than 92.00% of the impurities. The filter membrane structures at the inlets of the paraffin oil recovery tank, the wastewater recovery tank, and the extractant recovery tank can filter more than 97.00% of the impurities.

[0010] The centrifuge consists of at least one horizontal centrifugal drive mechanism, a drum filter element, a buffer filter element, a mixed liquid inlet pipe, a stratified liquid supply pipe, and an exhaust port; the drive motor of the horizontal centrifugal drive mechanism is installed outside the box body of the centrifuge and connected to the drive shaft inside the box body. The drum filter element is sleeved on the drive shaft. The drive motor drives the drive shaft to rotate at a high speed, so that the mixed liquid obtains a centrifugal effect. A buffer filter element is arranged below the horizontal centrifugal drive mechanism; the buffer filter element is laid flat on the bottom layer of the inner cavity of the centrifuge in the form of a U-shaped fold, and two vertical exhaust ports are arranged above the box body of the centrifuge to balance the internal and external pressure differences. Filter membrane structures are respectively installed at the outlet of the mixed liquid inlet pipe and the inlet of the stratified liquid supply pipe, and the mixed liquid inlet pipe corresponds to the position of the drum filter element, and the stratified liquid supply pipe corresponds to the position of the buffer filter element; the mixed liquid to be treated enters the centrifuge through the mixed liquid inlet pipe, and the horizontal centrifugal drive mechanism drives the mixed liquid to enter the drum filter element by inertia. By driving the rotation of the drive shaft by the drive motor, the mixed liquid is demulsified in the drum filter element and obtains a centrifugal effect, and then flows out through the hole structure on the surface of the drum filter element to the buffer filter element. The buffer filter element buffers the flowing mixed liquid and obtains a stratified liquid with obvious stratification. The stratified liquid enters the main separator tank through the stratified liquid supply pipe.

[0011] The inner cavity of the main separator tank is divided into a paraffin oil upper cavity, a middle cavity, and an extractant lower cavity by an upper inclined surface filter element and a lower inclined surface filter element. One side of the middle cavity is connected to the stratified liquid supply pipe to input the stratified liquid, and a filter membrane structure is arranged at the outlet of the stratified liquid supply pipe. On the other side of the middle cavity, a paraffin oil - wastewater supply pipe in the middle cavity, a primary wastewater output pipe, and a wastewater - extractant supply pipe in the middle cavity are arranged in sequence from top to bottom. At the tangent point of the inlets of the paraffin oil - wastewater supply pipe in the middle cavity, the primary wastewater output pipe, and the wastewater - extractant supply pipe in the middle cavity, a paraffin oil pipeline automatic switch and an extractant pipeline automatic switch are respectively set. The paraffin oil pipeline automatic switch is located between the middle cavity pipeline port and the extractant pipeline automatic switch. The paraffin oil - wastewater supply pipe in the middle cavity is connected to the first separator sub - tank, the primary wastewater output pipe is connected to the wastewater recovery tank, and the wastewater - extractant supply pipe in the middle cavity is connected to the second separator sub - tank;

[0012] At the outlet of the upper paraffin oil chamber, a primary paraffin oil output pipe and an upper chamber paraffin oil - wastewater supply pipe are arranged successively from top to bottom. At the tangent point of the inlet sides of the primary paraffin oil output pipe and the upper chamber paraffin oil - wastewater supply pipe, an automatic paraffin oil pipeline switch is provided. The automatic paraffin oil pipeline switch is located at the pipeline opening on one side of the paraffin oil upper chamber. The primary paraffin oil output pipe is connected to the paraffin oil recovery tank, and the upper chamber paraffin oil - wastewater supply pipe is connected to the first secondary separator tank. When static, the automatic paraffin oil pipeline switch and the automatic extractant pipeline switch are located between the middle chamber wastewater - extractant supply pipe and the middle chamber. When dynamic, when the automatic paraffin oil pipeline switch touches paraffin oil and does not touch water, the automatic paraffin oil pipeline switch is located between the middle chamber wastewater - extractant supply pipe and the middle chamber. The middle chamber paraffin oil - wastewater supply pipe and the primary wastewater output pipe are opened, and the middle chamber wastewater - extractant supply pipe is closed. When the automatic paraffin oil pipeline switch touches paraffin oil and touches water, the position of the automatic paraffin oil pipeline switch changes as the water level rises. At this time, the automatic paraffin oil pipeline switch is located between the middle chamber paraffin oil - wastewater supply pipe and the primary wastewater output pipe. The middle chamber paraffin oil - wastewater supply pipe is opened, the primary wastewater output pipe is semi - opened, and the middle chamber wastewater - extractant supply pipe is closed. When dynamic, when the automatic extractant pipeline switch touches paraffin oil, water and does not touch the extractant, the automatic extractant pipeline switch is located between the middle chamber wastewater - extractant supply pipe and the middle chamber. The middle chamber paraffin oil - wastewater supply pipe and the primary wastewater output pipe are opened, and the middle chamber wastewater - extractant supply pipe is closed. When the automatic extractant pipeline switch touches the extractant, the position of the automatic extractant pipeline switch changes as the extractant liquid level rises. At this time, the automatic paraffin oil pipeline switch is located between the middle chamber paraffin oil - wastewater supply pipe and the primary wastewater output pipe. The middle chamber paraffin oil - wastewater supply pipe is semi - opened, the primary wastewater output pipe is semi - opened, and the middle chamber wastewater - extractant supply pipe is semi - opened. When the extractant liquid level reaches a certain height, the middle chamber paraffin oil - wastewater supply pipe is closed, the primary wastewater output pipe is closed, and the middle chamber wastewater - extractant supply pipe is opened.

[0013] At the outlet of the lower chamber of the extractant, a waste water-extractant supply pipe for the lower chamber and a primary extractant output pipe are arranged in sequence from top to bottom. At the tangent point of the inlet sides of the waste water-extractant supply pipe for the lower chamber and the primary extractant output pipe, an automatic extractant pipeline switch is provided. The automatic extractant pipeline switch is located at the pipe orifice on one side of the lower chamber of the extractant. The waste water-extractant supply pipe for the lower chamber is connected to the secondary tank of the separator, and the primary extractant output pipe is connected to the extractant recovery tank. When standing still, the automatic paraffin oil pipeline switch is located between the paraffin oil-waste water supply pipe for the upper chamber and the upper chamber of paraffin oil. At this time, the primary paraffin oil output pipe is opened, and the paraffin oil-waste water supply pipe for the upper chamber is closed. During dynamic operation, when the automatic paraffin oil pipeline switch touches paraffin oil and does not touch water, the primary paraffin oil output pipe is opened, and the paraffin oil-waste water supply pipe for the upper chamber is closed. When the automatic paraffin oil pipeline switch touches paraffin oil and touches water, the primary paraffin oil output pipe is half-opened, and the paraffin oil-waste water supply pipe for the upper chamber is half-opened. The automatic paraffin oil pipeline switch rises as the water surface rises until the primary paraffin oil output pipe is closed and the paraffin oil-waste water supply pipe for the upper chamber is opened.

[0014] The layered liquid after continuous two-stage impurity removal enters the middle chamber of the main tank of the separator. The upper inclined filter element adsorbs the paraffin oil with a density less than that of water into the upper chamber of paraffin oil, the lower inclined filter element adsorbs the extractant with a density greater than that of water into the lower chamber of the extractant, and the layered liquid with the main body being waste water is in the middle chamber. When standing still, the automatic extractant pipeline switch is located between the primary extractant output pipe and the lower chamber of the extractant. At this time, the waste water-extractant supply pipe for the lower chamber is opened, and the primary extractant output pipe is closed. During dynamic operation, when the automatic extractant pipeline switch touches water and does not touch the extractant, the waste water-extractant supply pipe for the lower chamber is opened, and the primary extractant output pipe is closed. When the automatic extractant pipeline switch touches water and touches the extractant, the waste water-extractant supply pipe for the lower chamber is half-opened, and the primary extractant output pipe is half-opened. The automatic extractant pipeline switch rises as the extractant liquid level rises until the waste water-extractant supply pipe for the lower chamber is closed and the primary extractant output pipe is opened.

[0015] The purpose of setting the above-mentioned automatic paraffin oil pipeline switch and automatic extractant pipeline switch is to selectively open the pipeline passage when different liquids pass through.

[0016] In the lower part of the inner cavity of the first secondary separator tank, an upper inclined filter element is arranged, and the upper inclined filter element divides the inner cavity of the first secondary separator tank into an upper paraffin oil cavity of the secondary tank and a lower wastewater cavity of the first secondary tank. One side of the wastewater cavity of the first secondary tank is respectively connected to an upper cavity paraffin oil-wastewater supply pipe and a middle cavity paraffin oil-wastewater supply pipe with a membrane structure, and the other side of the wastewater cavity of the first secondary tank is connected to a first secondary wastewater output pipe with an automatic switch of the extraction agent pipeline. The first secondary wastewater output pipe is connected to a wastewater recovery tank; the outlet of the paraffin oil cavity of the secondary tank is connected to a paraffin oil recovery tank through a second paraffin oil output pipe; the paraffin oil-wastewater mixture in the upper paraffin oil cavity of the main separator tank enters the wastewater cavity of the first secondary tank of the first secondary separator tank through the upper cavity paraffin oil-wastewater supply pipe, and the paraffin oil-water mixture in the middle cavity of the main separator tank enters the wastewater cavity of the first secondary tank of the first secondary separator tank through the middle cavity paraffin oil-wastewater supply pipe. Paraffin oil enters the paraffin oil cavity of the secondary tank through the upper inclined filter element and is transported to the paraffin oil recovery tank through the second paraffin oil output pipe. The liquid in the wastewater cavity of the first secondary tank can block the passage of water through the automatic switch of the extraction agent pipeline.

[0017] In the upper part of the inner cavity of the second secondary separator tank, a lower inclined filter element is arranged, and the lower inclined filter element divides the inner cavity of the second secondary separator tank into an upper wastewater cavity of the second secondary tank and a lower extraction agent cavity of the secondary tank. One side of the wastewater cavity of the second secondary tank is respectively connected to a middle cavity wastewater-extraction agent supply pipe and a lower cavity wastewater-extraction agent supply pipe with a membrane structure, and the other side of the wastewater cavity of the second secondary tank is connected to a second secondary wastewater output pipe with an automatic switch of the paraffin oil pipeline. The second secondary wastewater output pipe is connected to a wastewater recovery tank; the outlet of the extraction agent cavity of the secondary tank is connected to an extraction agent recovery tank through a second extraction agent output pipe; the wastewater-extraction agent mixture in the middle cavity of the main separator tank enters the wastewater cavity of the second secondary tank of the second secondary separator tank through the middle cavity wastewater-extraction agent supply pipe, and the wastewater-extraction agent mixture in the lower extraction agent cavity of the main separator tank enters the wastewater cavity of the second secondary tank of the second secondary separator tank through the lower cavity wastewater-extraction agent supply pipe. The extraction agent enters the extraction agent cavity of the second secondary tank of the second secondary separator tank through the lower inclined filter element and is transported to the extraction agent recovery tank through the second extraction agent output pipe. The liquid in the wastewater cavity of the second secondary tank can block the passage of water through the automatic switch of the paraffin oil pipeline.

[0018] The paraffin oil recovery tank is connected to the upper paraffin oil cavity of the main separator tank through a first paraffin oil output pipe and to the paraffin oil cavity of the first secondary tank of the first secondary separator tank through a second paraffin oil output pipe. A membrane structure is arranged at the outlets of the first paraffin oil output pipe and the second paraffin oil output pipe, and the above-mentioned membrane structure is located inside the paraffin oil recovery tank. The paraffin oil in the paraffin oil recovery tank can be directly recycled.

[0019] The described wastewater recovery tank is connected to the paraffin oil upper chamber of the separator main tank through a primary wastewater output pipe, to the wastewater chamber of the first secondary tank of the separator through a secondary wastewater output pipe 1, and to the wastewater chamber of the second secondary tank of the separator through a secondary wastewater output pipe 2. A filter membrane structure is arranged at the outlets of the secondary wastewater output pipe 1, the primary wastewater output pipe, and the secondary wastewater output pipe 2, and the above filter membrane structure is located inside the wastewater recovery tank. The wastewater in the wastewater recovery tank can be directly recycled.

[0020] The described extractant recovery tank is connected to the extractant chamber of the second secondary tank of the separator through a secondary extractant output pipe, and to the lower extractant chamber of the separator main tank through a primary extractant output pipe. A filter membrane structure is arranged at the outlets of the secondary extractant output pipe and the primary extractant output pipe, and the above filter membrane structure is located inside the extractant recovery tank. The extractant in the extractant recovery tank can be directly recycled.

[0021] The present invention has the following advantages compared with the prior art:

[0022] The present invention separates the mixed liquid by combining centrifugation and gravity, and precisely separates three liquids by using a three-stage separation device; uses a centrifuge to stratify the three liquids with different densities, and the stratified liquid flows into the separator main tank and is separated by two layers of inclined plane filter elements. There is some mixed liquid in all three layers of liquid, and then the accurate separation of the oil-water mixture is realized through the secondary separator tanks, and finally the recycling of paraffin oil, wastewater, and extractant is realized.

[0023] The oil-water separator of the present invention directly realizes oil-water separation of the wastewater generated in the extraction production through centrifugation and filtration, reduces the discharge of industrial wastewater, and reduces the environmental pollution index. Through centrifugation - filtration - fine filtration, 99.50% - 85.50% of the wastewater can be recycled. Paraffin oil and extractant can be directly transported to the production line for recycling, realizing zero discharge of sewage and full recycling of resources. It not only actively responds to the national call for green production, but also reduces production costs and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 is the structural flowchart of the oil-water separator for precisely separating the paraffin oil - water - extractant mixture of the present invention;

[0025] Attached Figure 2 is the structural schematic diagram when the centrifuge adopted by the present invention is set;

[0026] Attached Figure 3 is the structural schematic diagram when the separator main tank adopted by the present invention is set;

[0027] Attached Figure 4 is the structural schematic diagram when the first secondary separator tank adopted by the present invention is set;

[0028] Attached Figure 5 is a schematic structural view when the separator secondary tank two adopted by the present invention is arranged;

[0029] Attached Figure 6 is a schematic structural view when the paraffin oil recovery tank adopted by the present invention is arranged;

[0030] Attached Figure 7 is a schematic structural view when the wastewater recovery tank adopted by the present invention is arranged;

[0031] Attached Figure 8 is a schematic structural view when the extractant recovery tank adopted by the present invention is arranged;

[0032] Attached Figure 9 is a schematic structural view when the inclined plane filter element adopted by the present invention is arranged;

[0033] Attached Figure 10 is a schematic structural view when the automatic switch of the paraffin oil pipeline adopted by the present invention is arranged;

[0034] Attached Figure 11 is a schematic structural view when the automatic switch of the extractant pipeline adopted by the present invention is arranged.

[0035] Wherein: 1 - centrifuge; 2 - separator main tank; 3 - separator secondary tank one; 4 - separator secondary tank two; 5 - paraffin oil recovery tank; 6 - wastewater recovery tank; 7 - extractant recovery tank; 8 - drum filter element; 9 - horizontal centrifugal drive mechanism; 10 - drive shaft; 11 - drive motor; 12 - buffer filter element; 13 - mixed liquid inlet pipe; 14 - stratified liquid supply pipe; 15 - filter membrane structure; 16 - exhaust port; 17 - inclined plane filter element; 171 - upper inclined plane filter element; 172 - lower inclined plane filter element; 18 - primary paraffin oil output pipe; 19 - upper cavity paraffin oil - wastewater supply pipe; 20 - middle cavity paraffin oil - wastewater supply pipe; 21 - primary wastewater output pipe; 22 - middle cavity wastewater - extractant supply pipe; 23 - lower cavity wastewater - extractant supply pipe; 24 - primary extractant output pipe; 25 - automatic switch of paraffin oil pipeline; 251 - partition disc one; 252 - buffer spring one; 253 - support frame one; 254 - density ball one; 26 - automatic switch of extractant pipeline; 261 - partition disc two; 262 - buffer spring two; 263 - support frame two; 264 - density ball two; 27 - secondary wastewater output pipe one; 28 - secondary paraffin oil output pipe; 29 - secondary wastewater output pipe two; 30 - secondary extractant output pipe; 31 - tempered glass disc; 32 - upper inclined columnar filter element; 33 - lower inclined columnar filter element; 34 - pipe groove. Specific embodiments

[0036] The present invention will be further described below in conjunction with the drawings and embodiments.

[0037] AsFigures 1-11 As shown in the figure: An oil-water separator for precisely separating a paraffin oil-water-extractant mixture. The oil-water separator includes a centrifuge 1, a main separator tank 2, a first secondary separator tank 3, a second secondary separator tank 4, a paraffin oil recovery tank 5, a wastewater recovery tank 6, and an extractant recovery tank 7. The material inlet on the side of the centrifuge 1 is connected to the mixed liquid inlet pipe 13 and the other side is connected to the stratified liquid supply pipe 14. The drum filter element 8 is wrapped around the drive shaft 10 and filters during the instant of liquid centrifugation. The buffer filter element 12 is folded and placed at the bottom layer of the centrifuge 1 to buffer the liquid flow rate and improve the stratification rate. At the middle of the main separator tank 2 with an inclined filter element 17 arranged in the inner cavity, it is connected to the stratified liquid supply pipe 14 to connect to the centrifuge 1. At the upper one-third of the upper inclined filter element 171 in the inner cavity of the main separator tank 2, a primary paraffin oil output pipe 18 is provided and connected to the paraffin oil recovery tank 5. Below the primary paraffin oil output pipe 18, an upper cavity paraffin oil-wastewater supply pipe 19 is provided and connected to the first secondary separator tank 3. The area between the upper inclined filter element 171 and the lower inclined filter element 172 in the inner cavity of the main separator tank 2 is the middle cavity of the main separator tank 2. In the middle of the middle cavity, a middle cavity paraffin oil-wastewater supply pipe 20 is provided and connected to the first secondary separator tank 3. Below the middle cavity paraffin oil-wastewater supply pipe 20, a primary wastewater output pipe 21 is provided and connected to the wastewater recovery tank 6. Below the primary wastewater output pipe 21, a middle cavity wastewater-extractant supply pipe is provided and connected to the second secondary separator tank 4. At the middle of the lower part of the lower inclined filter element 172 in the inner cavity of the main separator tank 2, a lower cavity wastewater-extractant supply pipe 23 is provided and connected to the second secondary separator tank 4. Below the lower cavity wastewater-extractant supply pipe 23, a primary extractant output pipe 24 is provided and connected to the extractant recovery tank 7. At the upper one-third of the upper inclined filter element 171 in the inner cavity of the first secondary separator tank 3, a paraffin oil outlet pipe 028 is provided and connected to the paraffin oil recovery tank 5. At the lower one-half of the upper inclined filter element 171 arranged in the inner cavity of the first secondary separator tank 3, a secondary wastewater output pipe one 27 is provided and connected to the wastewater recovery tank 6. At the upper one-third of the lower inclined filter element 172 arranged in the inner cavity of the second secondary separator tank 4, a secondary wastewater output pipe two 29 is provided and connected to the wastewater recovery tank 6. At the lower five-sixths of the lower inclined filter element 172 arranged in the inner cavity of the second secondary separator tank 4, a secondary extractant output pipe 30 is provided and connected to the extractant recovery tank 7.

[0038] When the separator works, the mixed liquid is affected by the centrifuge 1, and the paraffin oil-water-extractant mixture passes through the high-speed rotating drum filter element 8, causing the liquids with the same density to continuously aggregate and form a dispersion liquid with different densities. Then, through the action of the buffer filter element 12, the dispersion liquid is buffered and layered. After that, the layered liquid is transported to the main tank 2 of the separator for primary separation. Under the action of gravity, the liquid with a smaller density in the main tank 2 of the separator passes through the inclined filter element 17 above and is filtered and output to the upper chamber of paraffin oil. The generated paraffin oil is sensed by the density ball one 254 on the automatic switch 25 of the paraffin oil pipeline. The automatic switch 25 of the paraffin oil pipeline closes downward, the primary paraffin oil output pipe 18 opens, and the upper chamber paraffin oil-wastewater supply pipe 19 closes. The paraffin oil is sent to the paraffin oil recovery tank 5 through the primary paraffin oil output pipe 18. When the water below the paraffin oil touches the density ball one 254, the automatic switch 25 of the paraffin oil pipeline closes upward, the primary paraffin oil output pipe 18 closes, and the upper chamber paraffin oil-wastewater supply pipe 19 opens. The paraffin oil-water mixed liquid enters the first sub-tank 3 of the separator through the upper chamber paraffin oil-wastewater supply pipe 19; the liquid with a larger density passes through the inclined filter element 17 below and is filtered and output to the lower chamber of the extractant. The generated extractant is sensed by the density ball two 264 on the automatic switch 26 of the extractant pipeline. The automatic switch 26 of the extractant pipeline closes upward, the lower chamber wastewater-extractant supply pipe 23 closes, and the primary extractant output pipe 24 opens. The extractant is sent to the extractant recovery tank 7 through the primary extractant output pipe 24. When the water above the extractant touches the density ball two 264, the lower chamber wastewater-extractant supply pipe 23 opens, and the primary extractant output pipe 24 closes. The extractant-water mixed liquid enters the second sub-tank 4 of the separator through the lower chamber wastewater-extractant supply pipe 23; the separation principle of the mixed liquid at the upper chamber of paraffin oil and the lower chamber of the extractant is the same. When the water in the middle chamber touches the density ball one 254 and the density ball two 264, the middle chamber paraffin oil-wastewater supply pipe 20 and the middle chamber wastewater-extractant supply pipe 22 are closed simultaneously, and the primary wastewater output pipe 21 opens. The wastewater enters the wastewater recovery tank 6 through the primary wastewater output pipe 21. When the paraffin oil in the middle chamber touches the density ball one 254, the middle chamber paraffin oil-wastewater supply pipe 20 opens semi, the middle chamber wastewater-extractant supply pipe 22 and the primary wastewater output pipe 21 are closed simultaneously, and the paraffin oil-water mixture enters the first sub-tank 3 of the separator through the middle chamber paraffin oil-wastewater supply pipe 20. When the extractant in the middle chamber touches the density ball two 264, the middle chamber wastewater-extractant supply pipe 22 opens semi, the middle chamber paraffin oil-wastewater supply pipe 20 and the primary wastewater output pipe 21 are closed simultaneously, and the extractant-water mixed liquid enters the second sub-tank 4 of the separator through the middle chamber wastewater-extractant supply pipe 22, realizing the recycling of paraffin oil, wastewater, and extractant.

[0039] As Figure 2As shown in the figure: Two horizontal drive mechanisms 9 are arranged in the inner cavity of the centrifuge 1. The drive motor 11 is installed outside the box body and connected to the drive shaft 10. The drum filter element 8 is sleeved on the drive shaft 10. The drive motor 11 drives the drive shaft 10 to rotate at a high speed, so that the mixed liquid obtains a centrifugal effect. A buffer filter element 12 is arranged below the horizontal drive mechanism 9. The buffer filter element 12 is laid flat on the bottom layer of the box body in a form of zigzag folding. Two vertical exhaust ports 16 are arranged above the box body of the centrifuge 1, aiming to balance the pressure difference inside and outside the box body. Filter membrane structures 15 are respectively arranged at the ports of the mixed liquid inlet pipe 13 and the stratified liquid supply pipe 14. The pore diameters of the three layers of filter membranes of the filter membrane structure 15 are 0.05μm, 0.50μm and 2μm respectively. More than 85.00% of impurities can be filtered at the inlet of the stratified liquid supply pipe 14.

[0040] As Figures 3-5As shown in the figure: A filter membrane structure 15 is arranged inside the outlet end of the stratified liquid supply pipe 14 on the main separator tank 2, and the filter membrane structure 15 is located outside the main separator tank 2, so that more than 89.00% of the impurities in the stratified liquid entering the main separator tank 2 can be filtered. An upper inclined plane filter element 171 is arranged at two-fifths of the inner cavity of the main separator tank 2, and a lower inclined plane filter element 172 is arranged at four-fifths of the inner cavity. The purpose of setting the upper inclined plane filter element 171 and the lower inclined plane filter element 172 is to separate paraffin oil, waste water and extractant in the stratified liquid. A paraffin oil pipeline automatic switch 25 is arranged at the tangent point of the primary paraffin oil output pipe 18 and the upper cavity paraffin oil-waste water supply pipe 19. When static, the paraffin oil pipeline automatic switch 25 and the extractant pipeline automatic switch 26 are located between the middle cavity waste water-extractant supply pipe 22 and the middle cavity; when dynamic, when the paraffin oil pipeline automatic switch 25 touches paraffin oil and does not touch water, the paraffin oil pipeline automatic switch 25 is located between the middle cavity waste water-extractant supply pipe 22 and the middle cavity, the middle cavity paraffin oil-waste water supply pipe 20 and the primary waste water output pipe 21 are opened, and the middle cavity waste water-extractant supply pipe 22 is closed. When the paraffin oil pipeline automatic switch 25 touches paraffin oil and touches water, the position of the paraffin oil pipeline automatic switch 25 changes with the rise of the water surface. At this time, the paraffin oil pipeline automatic switch 25 is located between the middle cavity paraffin oil-waste water supply pipe 20 and the primary waste water output pipe 21. The middle cavity paraffin oil-waste water supply pipe 20 is opened, the primary waste water output pipe 21 is half-opened, and the middle cavity waste water-extractant supply pipe 22 is closed; when dynamic, when the extractant pipeline automatic switch 26 touches paraffin oil, water and does not touch the extractant, the extractant pipeline automatic switch 26 is located between the middle cavity waste water-extractant supply pipe 22 and the middle cavity, the middle cavity paraffin oil-waste water supply pipe 20 and the primary waste water output pipe 21 are opened, and the middle cavity waste water-extractant supply pipe 22 is closed. When the extractant pipeline automatic switch 26 touches the extractant, the position of the extractant pipeline automatic switch 26 changes with the rise of the extractant liquid level. At this time, the paraffin oil pipeline automatic switch 25 is located between the middle cavity paraffin oil-waste water supply pipe 20 and the primary waste water output pipe 21. The middle cavity paraffin oil-waste water supply pipe 20 is half-opened, the primary waste water output pipe 21 is half-opened, and the middle cavity waste water-extractant supply pipe 22 is half-opened. When the extractant liquid level reaches a certain height, the middle cavity paraffin oil-waste water supply pipe 20 is closed, the primary waste water output pipe 21 is closed, and the middle cavity waste water-extractant supply pipe 22 is opened.At the tangent points of the middle cavity paraffin oil - wastewater supply pipe 20, the primary wastewater output pipe 21, and the middle cavity wastewater - extractant supply pipe 22, an automatic switch 26 for the extractant pipeline and an automatic switch 25 for the paraffin oil pipeline are respectively arranged. When static, the automatic switch 25 for the paraffin oil pipeline is located between the upper cavity paraffin oil - wastewater supply pipe 19 and the paraffin oil upper cavity. At this time, the primary paraffin oil output pipe 18 is open, and the upper cavity paraffin oil - wastewater supply pipe 19 is closed. When dynamic, when the automatic switch 25 for the paraffin oil pipeline touches the paraffin oil and does not touch the water, the primary paraffin oil output pipe 18 is open, and the upper cavity paraffin oil - wastewater supply pipe 19 is closed. When the automatic switch 25 for the paraffin oil pipeline touches the paraffin oil and touches the water, the primary paraffin oil output pipe 18 is half - open, and the upper cavity paraffin oil - wastewater supply pipe 19 is half - open. The automatic switch 25 for the paraffin oil pipeline rises as the water surface rises until the primary paraffin oil output pipe 18 is closed and the upper cavity paraffin oil - wastewater supply pipe 19 is open. At the lower cavity wastewater - extractant supply pipe 23 and the primary extractant output pipe 24, an automatic switch 26 for the extractant pipeline is arranged. When static, the automatic switch 26 for the extractant pipeline is located between the primary extractant output pipe 24 and the extractant lower cavity. At this time, the lower cavity wastewater - extractant supply pipe 23 is open, and the primary extractant output pipe 24 is closed. When dynamic, when the automatic switch 26 for the extractant pipeline touches the water and does not touch the extractant, the lower cavity wastewater - extractant supply pipe 23 is open, and the primary extractant output pipe 24 is closed. When the automatic switch 26 for the extractant pipeline touches the water and touches the extractant, the lower cavity wastewater - extractant supply pipe 23 is half - open, and the primary extractant output pipe 24 is half - open. The automatic switch 26 for the extractant pipeline rises as the extractant liquid level rises until the lower cavity wastewater - extractant supply pipe 23 is closed and the primary extractant output pipe 24 is open. Inside the outlet ends of the upper cavity paraffin oil - wastewater supply pipe 19 and the middle cavity paraffin oil - wastewater supply pipe 20 at the lower part of the first secondary separator tank 3, a filter membrane structure 15 is arranged, and the filter membrane structure 15 is located outside the first secondary separator tank 3, so that the paraffin oil - wastewater entering the first secondary separator tank 3 can filter more than 92.00% of the impurities. At the upper four - fifths of the first secondary separator tank 3, an upper inclined surface filter element 171 is arranged, and an automatic switch 26 for the extractant pipeline is arranged at the secondary wastewater output pipe 27. Inside the outlet end of the upper part of the second secondary separator tank 4, a filter membrane structure 15 is arranged, and the filter membrane structure 15 is located outside the second secondary separator tank 4, so that the wastewater - extractant entering the second secondary separator tank 4 can filter more than 92.00% of the impurities. At the upper two - fifths of the second secondary separator tank 4, a lower inclined surface filter element 172 is arranged, and an automatic switch 25 for the paraffin oil pipeline is arranged at the secondary wastewater output pipe 29.

[0041] Such as Figures 6-8As shown in the figure: At the ports of the primary paraffin oil output pipe 18 and the secondary paraffin oil output pipe 28, a filter membrane structure 15 with three layers of filter membranes is provided and is communicated with the paraffin oil recovery tank 5. The paraffin oil input at the inlet of the paraffin oil recovery tank 5 can filter more than 97.00% of impurities; at the ports of the primary wastewater output pipe 21, the secondary wastewater output pipe one 27 and the secondary wastewater output pipe two 29, a filter membrane structure 15 with three layers of filter membranes is provided and is communicated with the wastewater recovery tank 6. The wastewater input at the inlet of the wastewater recovery tank 6 can filter more than 97.00% of impurities; at the ports of the primary extractant output pipe 24 and the secondary extractant output pipe 30, a filter membrane structure 15 with three layers of filter membranes is provided and is communicated with the extractant recovery tank 7. The extractant input at the inlet of the extractant recovery tank 7 can filter more than 97.00% of impurities.

[0042] As Figure 9 shown in the figure: The inclined plane filter element 17 is composed of a tempered glass disk 31, an upper inclined columnar filter element 32 and a lower inclined columnar filter element 33. The upper inclined columnar filter element 32 is screwed and fixed to the lower inclined columnar filter element 33 through the tempered glass disk 31. The inclined plane filter element 17 is made of a super oleophilic-superhydrophobic foam ceramic material, with a pore diameter of 48 - 60 nm and a porosity of more than 93%.

[0043] As Figure 10 shown in the figure: The automatic switch of the paraffin oil pipeline includes a dividing disk one 251, a buffer spring one 252, a support frame one 253 and a density ball one 254. The buffer spring one 252 is embedded in the grooves on both sides of the dividing disk one 251, and the upper end of the buffer spring one 252 is welded and fixed to the dividing disk one 251. The lower end of the buffer spring one 252 is fixedly connected to the upper end of the support frame one 253. The lower ends of the two support frames one 253 are fixedly welded with the density ball one 254. The dividing disk one 251, the support frame one 253 and the density ball one 254 are all made of polyethylene material with a density of 0.94 - 0.97 g / cm 3 ³. The buffer spring one 252 is made of glass fiber material. The density ball one 254 drives the lifting change of the dividing disk one 251 with the change at the boundary of the mixed liquid, realizing the function of the automatic switch.

[0044] As Figure 11 shown in the figure: The automatic switch 26 of the extractant pipeline includes a dividing disk two 261, a buffer spring two 262, a support frame two 263 and a density ball two 264. The buffer spring two 262 is embedded in the grooves on both sides of the dividing disk two 261, and the upper end of the buffer spring two 262 is welded and fixed to the dividing disk two 261. The lower end of the buffer spring two 262 is fixedly connected to the upper end of the support frame two 263. The lower ends of the two support frames two 263 are fixedly welded with the density ball two 264. The dividing disk two 261, the support frame two 263 and the density ball two 264 are all made of polyethylene material with a density of 1.18 - 1.19 g / cm 3It is composed of plexiglass material. The buffer spring two 262 is made of fiberglass material. The density ball two 264 drives the lifting of the dividing disk two 261 with the change at the boundary of the mixed liquid, realizing the function of automatic switch.

[0045] The oil-water separator for accurately separating paraffin oil-water-extractant mixture of the present invention is used for the recycling device of the extraction inlet circulating water. The benefit budget after the project is completed: The total daily water consumption: 120t * 5.7 yuan = 684 yuan; the total daily industrial salt: 0.075t * 2000 yuan = 150 yuan. If 100% recycling of circulating water is achieved, the cost reduction per day can be realized: 834 yuan / day, and the annual cost reduction: 275,220 yuan / year (operating 330 days throughout the year); if 80% recycling of circulating water is achieved, the cost reduction per day can be realized: 397.2 yuan / day, and the annual cost reduction: 23,760 yuan / year (operating 330 days throughout the year).

[0046] The oil-water separator of the present invention can meet the work requirements of energy conservation and emission reduction, environmental protection, cost reduction, resource recycling and reuse, and environmental impact assessment. Through one-time rough separation and two-time fine separation, the efficient separation of paraffin oil, wastewater and extractant mixture is realized. The separated liquid is recycled, realizing zero discharge of factory sewage and sustainable development of resources, and actively responding to the national call for energy conservation and emission reduction.

[0047] The above-provided embodiments are the key technologies of the present invention, and the protection scope of the present invention cannot be limited thereby. Any changes made to the technical solution by adopting the technical route of the present invention are within the protection scope of the present invention; the technologies not involved in the present invention can be realized by existing technical means.

Claims

1. An oil-water separator for precisely separating a paraffin oil-water-extractant mixture, characterized in that: The oil-water separator includes a centrifuge (1), a first secondary separator tank (3), a second secondary separator tank (4), a paraffin oil recovery tank (5), a wastewater recovery tank (6), and an extractant recovery tank (7), which are respectively connected to the main separator tank (2). The inner cavity of the main separator tank (2) is divided into an upper paraffin oil cavity, a middle cavity, and a lower extractant cavity by two layers of inclined filters (17). The middle cavity is connected to the centrifuge (1), the first secondary separator tank (3), the second secondary separator tank (4), and the wastewater recovery tank (6). The upper paraffin oil cavity is connected to the first secondary separator tank (3) and the paraffin oil recovery tank (5). The lower extractant cavity is connected to the second secondary separator tank (4) and the extractant recovery tank (7). The inclined filters (17) are made of super-hydrophilic-super-hydrophobic foam ceramic materials with a pore size of 48 - 60 nm and a porosity of more than 93%. At the bottom of the inner cavity of the centrifuge (1), a buffer filter (12) and a horizontal centrifugal drive mechanism (9) with a drum filter (8) above the buffer filter (12) are arranged. The buffer filter (12) and the drum filter (8) are made of super-hydrophilic-super-hydrophobic foam ceramic materials with a pore size of 5 - 10 nm and a porosity of more than 93%. Under the action of the centrifuge (1), the paraffin oil-water-extractant mixture passes through the high-speed rotating drum filter (8), causing the liquids with the same density to continuously aggregate and form a dispersion liquid with different densities. Then, under the action of the buffer filter (12), the dispersion liquid is buffered and stratified. After that, the stratified liquid is transported to the main separator tank (2) for primary separation. Under the action of gravity, in the main separator tank (2), the liquid with a lower density passes through the upper inclined filter (17) and is filtered and output to the upper paraffin oil cavity, and the generated paraffin oil is directly sent to the paraffin oil recovery tank (5). The liquid with a higher density passes through the lower inclined filter (17) and is filtered and output to the lower extractant cavity, and the generated extractant is directly sent to the extractant recovery tank (7). The wastewater remaining in the middle cavity is sent to the wastewater recovery tank (6), obtaining the recovered liquids of paraffin oil, wastewater, and extractant. In the initial stage of operation, when the stratified liquid is insufficient, part of the paraffin oil-wastewater flows out from the middle cavity to the first secondary separator tank (3) for secondary separation of paraffin oil and wastewater, and part of the wastewater-extractant flows out from the middle cavity to the second secondary separator tank (4) for secondary separation of wastewater and extractant. In the later stage of operation, when the wastewater discharge rate is less than the paraffin oil and extractant discharge rates, part of the paraffin oil-wastewater flows out through the upper paraffin oil cavity to the first secondary separator tank (3) for secondary separation of paraffin oil and wastewater, and part of the wastewater-extractant flows out through the lower extractant cavity to the second secondary separator tank (4) for secondary separation of wastewater and extractant.

2. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to claim 1, characterized in that: An upper inclined plane filter element (171) is arranged in the upper part of the inner cavity of the main separator tank (2), and a lower inclined plane filter element (172) is arranged in the lower part of the inner cavity. An upper inclined plane filter element (171) is arranged in the lower part of the inner cavity of the first auxiliary separator tank (3), and a lower inclined plane filter element (172) is arranged in the upper part of the inner cavity of the second auxiliary separator tank (4); the inclined plane filter element (17) includes a tempered glass disc (31), an upper inclined columnar filter element (32), and a lower inclined columnar filter element (33), and the upper inclined columnar filter element (32) is fixedly connected to the lower inclined columnar filter element (33) through the tempered glass disc (31) by screwing.

3. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to claim 1, wherein: At the outlet of the upper paraffin oil chamber, an automatic switch (25) for the paraffin oil pipeline is arranged. At the outlet of the middle chamber, an automatic switch (25) for the paraffin oil pipeline and an automatic switch (26) for the extractant pipeline are respectively provided. At the outlet of the lower extractant chamber, an automatic switch (26) for the extractant pipeline is arranged. The automatic switch (25) for the paraffin oil pipeline includes a first dividing disk (251), a first buffer spring (252), a first support frame (253), and a first density ball (254). The first buffer spring (252) is embedded in the grooves on both sides of the first dividing disk (251), and the upper end of the first buffer spring (252) is welded and fixed to the first dividing disk (251). The lower end of the first buffer spring (252) is fixedly connected to the upper end of the first support frame (253). The lower ends of the two first support frames (253) are fixedly welded to the first density ball (254). The first dividing disk (251), the first support frame (253), and the first density ball (254) are all made of polyethylene material with a density of 0.94 - 0.97 g / cm 3 ³. The first buffer spring (252) is made of glass fiber material. The first density ball (254) drives the lifting change of the first dividing disk (251) with the change of the boundary of the mixed liquid, realizing the function of the automatic switch. The automatic switch (26) for the extractant pipeline includes a second dividing disk (261), a second buffer spring (262), a second support frame (263), and a second density ball (264). The second buffer spring (262) is embedded in the grooves on both sides of the second dividing disk (261), and the upper end of the second buffer spring (262) is welded and fixed to the second dividing disk (261). The lower end of the second buffer spring (262) is fixedly connected to the upper end of the second support frame (263). The lower ends of the two second support frames (263) are fixedly welded to the second density ball (264). The second dividing disk (261), the second support frame (263), and the second density ball (264) are all made of plexiglass material with a density of 1.18 - 1.19 g / cm 3 ³. The second buffer spring (262) is made of glass fiber material. The second density ball (264) drives the lifting change of the second dividing disk (261) with the change of the boundary of the mixed liquid, realizing the function of the automatic switch.

4. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to claim 1, characterized in that: Filter membrane structures (15) are arranged at the outlet of the centrifuge (1) and the inlets of the main separator tank (2), the first auxiliary separator tank (3), the second auxiliary separator tank (4), the paraffin oil recovery tank (5), the wastewater recovery tank (6), and the extractant recovery tank (7). The filter membrane structure (15) is made by laying three filter membranes with pore diameters of 0.05μm, 0.50μm, and 2μm together and wrapping and fixing them with a tempered glass fixing ring; the filter membrane structure (15) at the outlet of the centrifuge (1) can filter more than 85.00% of impurities, the filter membrane structure (15) at the inlet of the main separator tank (2) can filter more than 89.00% of impurities, the filter membrane structure (15) at the inlet of the first auxiliary separator tank (3) can filter more than 92.00% of impurities, the filter membrane structure (15) at the inlet of the second auxiliary separator tank (4) can filter more than 92.00% of impurities, and the filter membrane structures (15) at the inlets of the paraffin oil recovery tank (5), the wastewater recovery tank (6), and the extractant recovery tank (7) can filter more than 97.00% of impurities.

5. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to any one of claims 1-4, characterized in that: The centrifuge (1) consists of at least one horizontal centrifugal drive mechanism (9), a drum filter element (8), a buffer filter element (12), a mixed liquid inlet pipe (13), a stratified liquid supply pipe (14), and an exhaust port (16); the drive motor (11) of the horizontal centrifugal drive mechanism (9) is installed outside the box body of the centrifuge (1) and connected to the drive shaft (10) inside the box body, and the drum filter element (8) is sleeved on the drive shaft (10). The drive motor (11) drives the drive shaft (10) to rotate at a high speed, so that the mixed liquid obtains a centrifugal effect. A buffer filter element (12) is arranged below the horizontal centrifugal drive mechanism (9); the buffer filter element (12) is laid flat on the bottom layer of the inner cavity of the centrifuge (1) in the form of a U-shaped fold, and two vertical exhaust ports (16) are arranged above the box body of the centrifuge (1) to balance the internal and external pressure differences. Filter membrane structures (15) are respectively installed at the outlet of the mixed liquid inlet pipe (13) and the inlet of the stratified liquid supply pipe (14), and the mixed liquid inlet pipe (13) corresponds to the position of the drum filter element (8), and the stratified liquid supply pipe (14) corresponds to the position of the buffer filter element (12); the mixed liquid to be treated enters the centrifuge (1) through the mixed liquid inlet pipe (13), and the horizontal centrifugal drive mechanism (9) drives the mixed liquid to enter the drum filter element (8) by inertia. Through the rotation of the drive shaft (10) driven by the drive motor (11), the mixed liquid is demulsified in the drum filter element (8) and obtains a centrifugal effect, and then flows out through the hole structure on the surface of the drum filter element (8) to the buffer filter element (12). The buffer filter element (12) buffers the flowing mixed liquid and obtains a stratified liquid with obvious stratification. The stratified liquid enters the main tank (2) of the separator through the stratified liquid supply pipe (14).

6. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to any one of claims 1-4, characterized in that: The inner cavity of the main separator tank (2) is divided into an upper paraffin oil chamber, a middle chamber, and a lower extractant chamber by an upper inclined filter element (171) and a lower inclined filter element (172). One side of the middle chamber is connected to a stratified liquid supply pipe (14) to input stratified liquid, and a filter membrane structure (15) is arranged at the outlet of the stratified liquid supply pipe (14). On the other side of the middle chamber, a paraffin oil - wastewater supply pipe (20) for the middle chamber, a primary wastewater output pipe (21), and a wastewater - extractant supply pipe (22) for the middle chamber are arranged in sequence from top to bottom. At the tangent point of the three pipes on the inlet side of the paraffin oil - wastewater supply pipe (20) for the middle chamber, the primary wastewater output pipe (21), and the wastewater - extractant supply pipe (22) for the middle chamber, a paraffin oil pipeline automatic switch (25) and an extractant pipeline automatic switch (26) are respectively set. The paraffin oil - wastewater supply pipe (20) for the middle chamber is connected to the first secondary separator tank (3), the primary wastewater output pipe (21) is connected to the wastewater recovery tank (6), and the wastewater - extractant supply pipe (22) for the middle chamber is connected to the second secondary separator tank (4); at the outlet of the upper paraffin oil chamber, a primary paraffin oil output pipe (18) and an upper chamber paraffin oil - wastewater supply pipe (19) are arranged in sequence from top to bottom. At the tangent point of the two pipes on the inlet side of the primary paraffin oil output pipe (18) and the upper chamber paraffin oil - wastewater supply pipe (19), a paraffin oil pipeline automatic switch (25) is set. The primary paraffin oil output pipe (18) is connected to the paraffin oil recovery tank (5), and the upper chamber paraffin oil - wastewater supply pipe (19) is connected to the first secondary separator tank (3); at the outlet of the lower extractant chamber, a lower chamber wastewater - extractant supply pipe (23) and a primary extractant output pipe (24) are arranged in sequence from top to bottom. At the tangent point of the two pipes on the inlet side of the lower chamber wastewater - extractant supply pipe (23) and the primary extractant output pipe (24), an extractant pipeline automatic switch (26) is set. The lower chamber wastewater - extractant supply pipe (23) is connected to the second secondary separator tank (4), and the primary extractant output pipe (24) is connected to the extractant recovery tank (7); the stratified liquid after continuous two - stage impurity removal enters the middle chamber of the main separator tank (2). The upper inclined filter element (171) adsorbs paraffin oil with a density less than that of water into the upper paraffin oil chamber, the lower inclined filter element (172) adsorbs extractant with a density greater than that of water into the lower extractant chamber, and the stratified liquid in the middle chamber is mainly wastewater.

7. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to any one of claims 1-4, characterized in that: In the lower part of the inner cavity of the first separator secondary tank (3), an upper inclined surface filter element (171) is arranged, and the upper inclined surface filter element (171) divides the inner cavity of the first separator secondary tank (3) into an upper secondary tank paraffin oil cavity and a lower first secondary tank waste water cavity. One side of the first secondary tank waste water cavity is respectively connected to an upper cavity paraffin oil - waste water supply pipe (19) and a middle cavity paraffin oil - waste water supply pipe (20) with a filter membrane structure (15). The other side of the first secondary tank waste water cavity is connected to a first secondary waste water output pipe (27) with an automatic extractant pipeline switch (26), and the first secondary waste water output pipe (27) is connected to a waste water recovery tank (6). The outlet of the secondary tank paraffin oil cavity is connected to a paraffin oil recovery tank (5) through a second - stage paraffin oil output pipe (28). The paraffin oil - waste water mixture in the paraffin oil upper cavity of the main separator tank (2) enters the first secondary tank waste water cavity of the first separator secondary tank (3) through the upper cavity paraffin oil - waste water supply pipe (19), and the paraffin oil - water mixture in the middle cavity of the main separator tank (2) enters the first secondary tank waste water cavity of the first separator secondary tank (3) through the middle cavity paraffin oil - waste water supply pipe (20). The paraffin oil enters the secondary tank paraffin oil cavity through the upper inclined surface filter element (171) and is transported to the paraffin oil recovery tank (5) through the second - stage paraffin oil output pipe (28). The liquid in the first secondary tank waste water cavity can block the passage of moisture through the automatic extractant pipeline switch (26).

8. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to any one of claims 1-4, characterized in that: In the upper part of the inner cavity of the second separator secondary tank (4), a lower inclined surface filter element (172) is arranged, and the lower inclined surface filter element (172) divides the inner cavity of the second separator secondary tank (4) into an upper second secondary tank waste water cavity and a lower secondary tank extractant cavity. One side of the second secondary tank waste water cavity is respectively connected to a middle cavity waste water - extractant supply pipe (22) and a lower cavity waste water - extractant supply pipe (23) with a filter membrane structure (15). The other side of the second secondary tank waste water cavity is connected to a second secondary waste water output pipe (29) with an automatic paraffin oil pipeline switch (25), and the second secondary waste water output pipe (29) is connected to a waste water recovery tank (6). The outlet of the secondary tank extractant cavity is connected to an extractant recovery tank (7) through a second - stage extractant output pipe (30). The waste water - extractant mixture in the middle cavity of the main separator tank (2) enters the second secondary tank waste water cavity of the second separator secondary tank (4) through the middle cavity waste water - extractant supply pipe (22), and the waste water - extractant mixture in the extractant lower cavity of the main separator tank (2) enters the second secondary tank waste water cavity of the second separator secondary tank (4) through the lower cavity waste water - extractant supply pipe (23). The extractant enters the secondary tank extractant cavity of the second separator secondary tank (4) through the lower inclined surface filter element (172) and is transported to the extractant recovery tank (7) through the second - stage extractant output pipe (30). The liquid in the second secondary tank waste water cavity can block the passage of moisture through the automatic paraffin oil pipeline switch (25).

9. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to any one of claims 1-4, characterized in that: The described paraffin oil recovery tank (5) is connected to the paraffin oil upper chamber of the separator main tank (2) through the primary paraffin oil output pipe (18) and to the paraffin oil chamber of the first secondary tank (3) of the separator through the secondary paraffin oil output pipe (28). A filter membrane structure (15) is arranged at the outlets of the primary paraffin oil output pipe (18) and the secondary paraffin oil output pipe (28), and the above filter membrane structure (15) is located inside the tank body of the paraffin oil recovery tank (5). The paraffin oil in the paraffin oil recovery tank (5) can be directly recycled.

10. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to any one of claims 1-4, characterized in that: The described wastewater recovery tank (6) is connected to the paraffin oil upper chamber of the separator main tank (2) through the primary wastewater output pipe (21), to the wastewater chamber of the first secondary tank (3) of the separator through the first secondary wastewater output pipe (27), and to the wastewater chamber of the second secondary tank (4) of the separator through the second secondary wastewater output pipe (29). A filter membrane structure (15) is arranged at the outlets of the first secondary wastewater output pipe (27), the primary wastewater output pipe (21), and the second secondary wastewater output pipe (29), and the above filter membrane structure (15) is located inside the tank body of the wastewater recovery tank (6). The wastewater in the wastewater recovery tank (6) can be directly recycled.

11. The oil-water separator for precisely separating a paraffin oil-water-extractant mixture according to any one of claims 1-4, characterized in that: The described extractant recovery tank (7) is connected to the extractant chamber of the second secondary tank (4) of the separator through the secondary extractant output pipe (30) and to the lower extractant chamber of the separator main tank (2) through the primary extractant output pipe (24). A filter membrane structure (15) is arranged at the outlets of the secondary extractant output pipe (30) and the primary extractant output pipe (24), and the above filter membrane structure (15) is located inside the tank body of the extractant recovery tank (7). The extractant in the extractant recovery tank (7) can be directly recycled.

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