Oil-water separation filter element

Abstract

The oil-water separation filter element comprises an outer frame and a filling body, the outer frame comprises a barrel, a liquid inlet end and a liquid outlet end, the liquid inlet end and the liquid outlet end are arranged at the two ends of the barrel, the liquid inlet end is arranged at the bottom end and communicated with an external pipeline, and the liquid outlet end is arranged at the top end and communicated with the external environment. A first perforated plate is fixedly arranged at the position, close to the liquid inlet end, of the outer frame, a second perforated plate is fixedly arranged at the position, close to the liquid outlet end, of the outer frame, the space between the first perforated plate and the second perforated plate is filled with metal fibers disorderly, and the metal fibers form the filling body. The metal fibers are disorderly filled in the outer frame to form the filling body with large aperture and high porosity, aggregation growth and separation of tiny oil droplets are controlled by utilizing the characteristics that the metal fibers have rough surfaces and the affinity of the oil droplets is weaker than that of organic fibers, and the oil-water separator has the advantages of simple manufacturing process, high oil droplet capturing efficiency, good oil-water separation effect and high oil-water separation efficiency. The maintenance frequency is low; and the use cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil-water separation, and particularly relates to an oil-water separation filter element for extracting metal elements. Background Art

[0002] In industries such as hydrometallurgy that generate wastewater-containing solutions, solution purification is an important process. Using an aqueous solution to extract valuable metals is a common means of solution purification. By taking advantage of the different distribution ratios of certain metals in an aqueous solution between an organic solvent (extraction oil) and the aqueous solution, when the organic phase and the aqueous phase are in full contact, some metals in the aqueous phase will selectively transfer to the organic phase. By collecting the organic phase, the extraction of useful metals is achieved. In this process, a filter element is generally used to make the organic phase grow and then separate from the aqueous phase.

[0003] The commonly used filter element separation materials in the prior art are organic fibers and stainless steel fiber felts. For the former, by adding lipophilic groups to the organic fibers, a solvation effect is formed with oil droplets through the lipophilic groups to capture and aggregate the oil droplets to achieve separation. However, this separation method usually requires the oil droplets to grow to overcome the solvation force before they can break away from the organic fibers. However, restricted by the pore size of the organic fiber filter element, when the oil droplets have not reached the detachable volume, they usually fuse with the surrounding growing oil droplets to form larger oil droplets and are restricted by more solvation forces. Eventually, a continuous oil film is formed on the surface of the organic fiber filter element, resulting in problems such as poor filter element separation effect, high filter element cleaning frequency, and short service life. For the latter, during the preparation process, pressing and sintering processes are required to ensure that the structure is dense enough to intercept oil droplets. Usually, the thickness is relatively thin to allow the aqueous phase to pass through quickly. The separation core prepared from this material is restricted by the pore size and is also prone to forming an oil film on the surface, resulting in a decline in the separation and aggregation effect of the filter element. In addition, to ensure the separation effect, when assembling the filter element, the organic fiber or stainless steel fiber felt is usually wound in multiple turns and then installed. When the liquid phase to be separated enters from the lower end and seeps out from the periphery after passing through the filter material, this filter element structure has problems on the one hand, such as being prone to further cause the formation of an oil film, difficult to clean, and increased maintenance costs; on the other hand, since both the aqueous phase and the oil droplets seep out from different heights, the rising path of the oil droplets is long and it is easy to mix with the aqueous phase again, resulting in low aggregation efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an oil-water separation filter element to solve the problems that when the existing oil-water separation filter element is used, an oil film is easily formed on the surface of the filter element, resulting in a decline in the separation effect of the filter element, an increase in maintenance costs, and even failure.

[0005] The utility model is realized through the following technical solutions:

[0006] The utility model provides an oil-water separation filter element, which comprises an outer frame and a filling body. The outer frame includes a cylinder body, a liquid inlet end and a liquid outlet end arranged at both ends of the cylinder body. The liquid inlet end is arranged at the bottom end and is connected to an external pipeline, and the liquid outlet end is arranged at the top end and is communicated with the external environment. A first porous plate is fixedly arranged near the liquid inlet end of the outer frame, and a second porous plate is fixedly arranged near the liquid outlet end of the outer frame. Metal fibers are randomly filled between the first porous plate and the second porous plate, and the metal fibers form the filling body.

[0007] Based on the above technical features, the metal fibers are randomly filled in the outer frame to form a filling body with large pore diameter and high porosity. When the mixed liquid flows through the filling body, the micro oil droplets fully contact the growth points on the surface of the randomly filled metal fibers, aggregate and grow into large oil droplets on their surface, and then float up. This filter element uses the rough surface of the metal fibers to form the aggregation growth points of the oil droplets, and uses the affinity of the oil droplets extracting metal elements for the metal fibers to improve the capture efficiency of the oil droplets, thereby improving the oil-water separation effect of the device. This filter element has the characteristics of simple manufacturing process, high oil droplet capture efficiency, good oil-water separation effect, low maintenance frequency and low use cost.

[0008] Preferably, the metal fibers are stainless steel fibers, or titanium fibers, or copper fibers. The selection of the metal fibers is determined according to the characteristics of the mixed liquid to be separated and the affinity of the organic phase used for extraction for the metal fibers.

[0009] Preferably, the metal fibers are stainless steel fibers with a metal ion layer plated on the surface. The plated metal ions on the surface of the metal fibers are determined according to the extracted metal elements to improve the affinity of the metal fibers for the oil droplets and the oil droplet capture efficiency.

[0010] Furthermore, the diameter of the metal fibers is 2-30 microns, the porosity of the filling body is 75-90%, and the pore diameter of the filling body is greater than 20 microns. The 2-30 micron metal fibers are beneficial to form a filling body with large pores and high porosity, so that when the oil droplets grow to a volume that can break away from the surface of the metal fibers, they can still easily pass through without forming an oil film.

[0011] Preferably, the metal fibers are produced by the cluster drawing method, which has low manufacturing cost and a rough fiber surface, and has more growth points for micro oil droplets.

[0012] Preferably, the thickness of the filling body is at least 100 mm to facilitate the full capture of micro oil droplets.

[0013] Preferably, the filler includes at least two layers of filling layers, and the pore diameters of the filling layers increase sequentially from the liquid inlet end to the liquid outlet end. This design can not only allow the large oil droplets that have aggregated and grown in the lower filling layer to pass through the upper filling layer smoothly, but also continue to capture the micro oil droplets that have not been captured by the lower filling layer in sequence, enabling them to continue to aggregate and grow, thereby achieving a better separation effect.

[0014] Furthermore, a separation component is provided between the filling layers, and the separation component is a wire mesh or a perforated plate. This design can prevent the metal fibers from migrating along the liquid flow direction, so that each filling layer maintains a sufficient filling density during use;

[0015] Furthermore, a concave ring is provided on the cylinder body, and the concave ring forms a limit for the separation component;

[0016] Preferably, both the first perforated plate and the second perforated plate are U-shaped perforated plates formed by stamping. The side walls of the U-shaped perforated plates are closely attached to the inner wall of the outer frame. This design can simplify the internal structure of the filter element and facilitate assembly. At the same time, it is beneficial to form the diversion of the mixed liquid, preventing the mixed liquid from directly filtering along the inner wall of the cylinder body and affecting the separation efficiency.

[0017] Preferably, a sealing plate is fixedly provided on the outside of the liquid inlet end of the outer frame, and a water inlet joint is connected to the sealing plate. The water inlet joint is communicated with an external pipeline. This design is conducive to assembling the filter element inside equipment such as a coalescence tank for use, improving the assembly convenience.

[0018] Beneficial effects

[0019] One of the above technical solutions has the following advantages or beneficial effects:

[0020] 1) By randomly filling metal fibers in the outer frame to form a filler with large pore diameters and high porosity, when the mixed liquid flows through the filler, the micro oil droplets fully contact the growth points on the surface of the randomly filled metal fibers and aggregate and grow into large oil droplets on their surfaces before floating up. This filter element uses the rough surface of the metal fibers to form the aggregation growth points of the oil droplets, and uses the affinity of the oil droplets extracting metal elements for the metal fibers to improve the capture efficiency of the oil droplets, thereby enhancing the oil-water separation effect of the device; This filter element has the characteristics of simple manufacturing process, high oil droplet capture efficiency, good oil-water separation effect, low maintenance frequency and low use cost.

[0021] 2) By selecting metal fibers made of a specific metal material or electroplating specific metal ions on the surface of the metal fibers, the metal fibers have a better affinity for oil droplets, improving the capture efficiency of the oil droplets and promoting the enhancement of the oil-water separation effect. It is especially suitable for the oil-water separation of oily wastewater in the hydrometallurgy industry, improving the recovery rate of precious metals. Description of the drawings

[0022] Other features, objects, and advantages of the present utility model will become more apparent from the following detailed description of non-limiting embodiments read in conjunction with the accompanying drawings:

[0023] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0024] Figure 2 is a schematic top view structure diagram of the present utility model;

[0025] Figure 3 of the present utility model Figure 1 is a schematic diagram of the structure of part A;

[0026] Figure 4 of the present utility model Figure 1 is a schematic diagram of the structure of part B;

[0027] Figure 5 of the present utility model Figure 1 is a schematic diagram of the structure of part C;

[0028] In the figure: inlet joint 1; sealing plate 2; cylinder body 3; liquid inlet end 31; liquid outlet end 32; concave ring 33; first perforated plate 4; filling body 5; separation component 6; second perforated plate 7. Detailed implementation manners

[0029] The following further elaborates on the present utility model in conjunction with embodiments, but the implementation manners of the present utility model are not limited thereto.

[0030] The present utility model provides an oil-water separation filter element, including an outer frame and a filling body 5. The outer frame can be cylindrical, tubular, or box-shaped structure. As Figure 1 shown, the outer frame includes a cylinder body 3 and a liquid inlet end 31 and a liquid outlet end 32 provided at both ends of the cylinder body 3. The liquid inlet end 31 is provided at the bottom end of the cylinder body 3, and a sealing plate 2 is fixedly provided outside the liquid inlet end 31. An inlet joint 1 is connected to the sealing plate 2, and the inlet joint 1 is communicated with an external pipeline; the liquid outlet end 32 is provided at the top end and is communicated with the external environment. The external environment can be the inner cavity of other devices such as a coalescence tank body, a floating oil tank, etc., or the inlet end of a downstream device.

[0031] A first perforated plate 4 is fixedly provided near the liquid inlet end 31 of the outer frame, and a second perforated plate 7 is fixedly provided near the liquid outlet end 32 of the outer frame. As Figure 2 shown, through holes are uniformly formed on the first perforated plate 4 and the second perforated plate 7 for evenly distributing the liquid flow, facilitating the uniform passage of the mixed liquid to be separated through the filling body 5. Both the first perforated plate 4 and the second perforated plate 7 are U-shaped perforated plates formed by stamping. As Figure 3 , Figure 4As shown, the side wall of the U-shaped orifice plate is arranged close to the inner wall of the outer frame to simplify the internal structure of the filter element and form a guide for the mixed liquid to prevent the mixed liquid from being directly filtered along the inner wall of the cylinder 3 and affecting the separation efficiency.

[0032] like Figure 1 As shown, metal fibers are randomly filled between the first porous plate 4 and the second porous plate 7, and the metal fibers constitute the filling body 5; the metal fibers are metal fibers with a diameter of 2 to 30 microns manufactured by a bundle drawing method, and the metal fibers have a relatively rough surface and are conducive to forming a filling body 5 with large pores and high porosity. The pores of the filling body 5 are set to 75 to 90% and the pore diameter of the filling body 5 is greater than 20 microns, so that when the oil droplets grow to a volume that can be detached from the surface of the metal fiber, they can still easily pass through without forming an oil film.

[0033] Preferably, the metal fiber is a stainless steel fiber, or a titanium fiber, or a copper fiber, or a stainless steel fiber with a specific metal ion layer coated on the surface. The material of the metal fiber or the metal ion coating is selected according to the medium environment of the liquid phase to be separated and the metal element to be extracted. For example, when the liquid phase to be separated is a highly corrosive liquid phase containing chloride ions, a metal fiber based on titanium metal fiber is selected; when the liquid phase to be separated is a conventional liquid phase, a metal fiber based on stainless steel metal fiber is selected; when the metal to be extracted is copper element, copper metal fiber is selected; when the metal to be extracted is cobalt element, a stainless steel metal fiber coated with a cobalt metal layer is selected; when there are multiple metal elements to be extracted, the metal fiber used has a corresponding multiple metal material.

[0034] Preferably, the thickness of the filler 5 is at least 100 mm, so that the micro-oil droplets are fully captured. The filler 5 includes at least two filling layers, and the pore diameters of the filling layers increase from the liquid inlet end 31 to the liquid outlet end 32; a partition component 6 is provided between the filling layers, and the partition component 6 is a metal wire mesh or a porous plate to prevent the metal fibers from migrating in the direction of the liquid flow, so as to ensure that each filling layer maintains a sufficient filling density during use; Figure 5 As shown, a concave ring 33 is provided on the cylinder 3, and the concave ring 33 forms a limit for the partition assembly 6 to prevent the partition assembly 6 from shifting when subjected to overflow pressure.

[0035] The present invention utilizes the rough surface of metal fibers produced by cluster drawing to form aggregation growth points for oil droplets, and uses the affinity of oil droplets extracting metal elements for the metal fibers to improve the capture efficiency of the oil droplets. The metal fibers are randomly filled in the outer frame to form a filler 5 with large pore size and high porosity. On the one hand, when the mixed liquid flows through the filler 5, the micro oil droplets fully contact the growth points on the surface of the randomly filled metal fibers, aggregate and grow into large oil droplets on their surface and then float upward, thereby improving the oil-water separation effect of the device; on the other hand, since the affinity of the metal fibers for the oil droplets is weaker than that of the organic fibers for the oil droplets, and the large pore size of the filler 5 can not only avoid the formation of an oil film, but also facilitate the cleaning of the filter element by means of backwashing, etc., which is easy to maintain, reduces the replacement frequency, and reduces the use cost. Therefore, the oil-water separation filter element of the present utility model has the characteristics of simple manufacturing process, high oil droplet capture efficiency, good oil-water separation effect, simple maintenance and low use cost.

[0036] The above is only a preferred embodiment of the present utility model, and does not impose any limitation on the technical scope of the present utility model. Therefore, any minor modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the protection scope of the present utility model.

Claims

1. An oil-water separation filter element, comprising an outer frame and a filling body (5), characterized in that: The outer frame comprises a cylinder (3) and a liquid inlet end (31) and a liquid outlet end (32) arranged at both ends of the cylinder (3); the liquid inlet end (31) is arranged at the bottom end and connected to an external pipeline, and the liquid outlet end (32) is arranged at the top end and connected to the external environment; a first porous plate (4) is fixedly provided on the outer frame near the liquid inlet end (31); a second porous plate (7) is fixedly provided on the outer frame near the liquid outlet end (32); metal fibers are randomly filled between the first porous plate (4) and the second porous plate (7); the metal fibers constitute the filling body (5).

2. The oil-water separation filter element according to claim 1, characterized in that: The metal fiber is stainless steel fiber, titanium fiber, or copper fiber.

3. The oil-water separation filter element according to claim 1, characterized in that: The metal fiber is a stainless steel fiber with a metal ion layer plated on the surface.

4. The oil-water separation filter element according to claim 1, characterized in that: The diameter of the metal fiber is 2 to 30 micrometers, the porosity of the filler (5) is 75 to 90%, and the pore diameter of the filler (5) is greater than 20 micrometers.

5. The oil-water separation filter element according to claim 1, characterized in that: The thickness of the filling body (5) is at least 100 mm.

6. The oil-water separation filter element according to claim 1, characterized in that: The filling body (5) comprises at least two filling layers, and the pore diameters of the filling layers increase sequentially from the liquid inlet end (31) to the liquid outlet end (32).

7. The oil-water separation filter element according to claim 6, characterized in that: A partition component (6) is provided between the filling layers, and the partition component (6) is a metal wire mesh or a porous plate.

8. The oil-water separation filter element according to claim 7, characterized in that: The cylinder (3) is provided with a concave ring (33), and the concave ring (33) forms a limit for the partition assembly (6).

9. The oil-water separation filter element according to claim 1, characterized in that: The first porous plate (4) and the second porous plate (7) are both U-shaped porous plates formed by stamping, and the side walls of the U-shaped porous plates are arranged in close contact with the inner wall of the outer frame.

10. The oil-water separation filter element according to claim 1, characterized in that: A sealing plate (2) is fixedly provided on the outside of the liquid inlet end (31) of the outer frame, and a water inlet joint (1) is connected to the sealing plate (2), and the water inlet joint (1) is communicated with an external pipeline.

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