A phosphating liquid treatment system

Abstract

The utility model discloses a phosphating solution treatment system for removing Fe 2+ The invention relates to a phosphating tank, an aeration container, an aeration part and a sediment component. The aeration part provided in the aeration container is used to increase the contact area between the phosphating solution and the air, so that the Fe 2+ The ions are fully oxidized and converted into sediment. The sediment in the phosphating solution is then filtered through the sediment component, and the filtered phosphating solution is recycled. The utility model has a simple structure and is easy to operate. It avoids adding accelerators and salvaging sediment operations, reduces the labor intensity of operators, and improves work efficiency. At the same time, it also effectively avoids black troughs due to untimely operation and excessive sediment adhering to the wire, effectively ensuring the quality of the wire.

Description

Technical Field

[0001] The utility model relates to a waste liquid treatment system, in particular to a phosphating liquid treatment system. Background Art

[0002] The phosphating process is a process of forming a phosphate chemical conversion film through chemical and electrochemical reactions. The formed phosphating film can provide protection for the base metal and prevent the metal from being corroded to a certain extent. The process flow of the phosphating process is generally pickling-water washing-water washing-phosphating-water washing-saponification, among which phosphating is the most important step in the process.

[0003] Currently, most existing phosphating solutions require the addition of accelerators, which are used to promote the phosphating reaction and oxidize Fe 2+ ions, making Fe 2+ The ions are oxidized to Fe 3+ Ion, Fe 3+ Ions and phosphates combine to form iron phosphate sediment. The iron phosphate sediment is loose, has a high water absorption rate, and is large in size. Users need to stop production and clean it regularly, resulting in low production efficiency and high costs. Therefore, phosphating solution without accelerator is more popular, but the disadvantage of phosphating solution without accelerator is that Fe 2+ If the ion concentration rises too quickly and reaches a certain level, the phosphating solution cannot be used. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a method for achieving oxidation without adding a promoter, removing Fe 2+ Ionic phosphating liquid treatment system.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A phosphating solution treatment system for removing Fe from the phosphating solution 2+ ions, including:

[0007] A phosphating tank, used to contain a phosphating solution, the phosphating tank having a first liquid outlet and a second liquid inlet;

[0008] An aeration container, wherein a first liquid inlet and a second liquid outlet are respectively provided at both ends of the aeration container, wherein the first liquid outlet is connected to the first liquid inlet, and an aeration portion is provided in the aeration container away from the first liquid inlet, wherein the aeration portion is used to increase the contact area between the phosphating solution and the air, so that the Fe in the phosphating solution 2+ The ions are converted into sediment by full oxidation;

[0009] A sediment component, one end of which is connected to the second liquid outlet for filtering the sediment in the phosphating solution, and the other end of which is connected to the second liquid inlet for recovering the filtered liquid into the phosphating tank.

[0010] Furthermore, the aeration section includes a plurality of aeration units, and the plurality of aeration units are arranged at intervals along the flow direction of the phosphating liquid in the aeration container.

[0011] Furthermore, the aeration unit comprises an aeration plate and an overflow groove, wherein the overflow groove is arranged along the circumference of the aeration plate, and the aeration plate is provided with a through hole for the phosphating solution to pass through.

[0012] Furthermore, the aeration unit has a connection portion connected to the inner wall of the aeration container, and a gap is formed between the other end of the aeration unit relative to the connection portion and the inner wall of the aeration container; the connection portions of two adjacent aeration units are arranged corresponding to the gap.

[0013] Furthermore, the aeration unit is made of PVC material.

[0014] Furthermore, a distributor is provided in the aeration container, and the distributor is connected to the first liquid inlet, and is used for controlling and dispersing the phosphating liquid introduced into the aeration container.

[0015] Furthermore, the aeration container is provided with a first air inlet and an air outlet, the air inlet is located between the aeration part and the second liquid outlet, and the air outlet is located at one end of the liquid inlet; the phosphating tank is provided with a second air inlet, and the air outlet is connected to the second air inlet.

[0016] Furthermore, the inner surface of the aeration container is sprayed with a Teflon coating.

[0017] Furthermore, the sediment component includes a plurality of filter press units, and the plurality of filter press units are arranged in parallel.

[0018] Furthermore, the filter press unit includes a filter press and a pressure gauge for detecting pressure changes of the filter press.

[0019] The beneficial effects of the utility model are:

[0020] The phosphating liquid treatment system of the utility model uses an aeration part arranged in an aeration container to increase the contact area between the phosphating liquid and the air, so that the Fe 2+The ions are fully oxidized and converted into sediment. The sediment in the phosphating solution is then filtered through the sediment component, and the filtered phosphating solution is recycled. The utility model has a simple structure and is easy to operate. It avoids adding accelerators and salvaging sediment operations, reduces the labor intensity of operators, and improves work efficiency. At the same time, it also effectively avoids black troughs due to untimely operation and excessive sediment adhering to the wire, effectively ensuring the quality of the wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the aeration unit of the utility model.

[0024] in,

[0025] 100, phosphating tank; 110, first liquid outlet; 120, second liquid inlet;

[0026] 200, aeration container; 210, first liquid inlet; 220, second liquid outlet; 230, aeration part; 231, aeration unit; 231a, aeration plate; 231b, overflow tank; 231c, through hole; 231d, connection part; 232, gap; 240, distributor; 250, first air inlet; 260, air outlet;

[0027] 300. Sediment assembly; 310. Filter press; 320. Pressure gauge. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the concept, specific structure and technical effects of the utility model in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the utility model. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the creation of the utility model can be combined interchangeably without conflicting with each other.

[0029] Reference Figure 1 , a phosphating solution treatment system for removing Fe from phosphating solution 2+The invention discloses a phosphating tank 100, an aeration container 200, an aeration part 230 and a sediment assembly 300; wherein the phosphating tank 100 is used to contain the phosphating solution, and the phosphating tank 100 has a first liquid outlet 110 and a second liquid inlet 120, the first liquid outlet 110 is located at the lower part of the phosphating tank 100, so as to facilitate the discharge of the phosphating solution, and the position of the second liquid inlet 120 in the phosphating tank 100 is not limited, for example, it can be set at the top of the phosphating tank 100, such as Figure 1 As shown, it can also be arranged at the bottom of the phosphating tank 100; an aeration container 200, wherein the aeration container 200 has a first liquid inlet 210 and a second liquid outlet 220 at both ends thereof, and the aeration container 200 can be in various shapes, and in this case, it is preferably cylindrical and placed vertically, that is, the first liquid inlet 210 is located at the top of the aeration container 200, and the second liquid outlet 220 is located at the bottom of the aeration container 200. The first liquid outlet 110 is connected to the first liquid inlet 210, and an aeration portion 230 is arranged in the aeration container 200 away from the first liquid inlet 210, and the aeration portion 230 is used to increase the contact area between the phosphating solution and the air, so that the Fe in the phosphating solution 2+ The ions are converted into sediment through full oxidation; a sediment component 300, one end of which is connected to the second liquid outlet 220 for filtering the sediment in the phosphating solution, and the other end of which is connected to the second liquid inlet 120 for recovering the filtered liquid into the phosphating tank 100.

[0030] It should be noted that for phosphating solution without accelerator, there are generally two ways to achieve a better phosphating effect. On the one hand, it can be achieved by adjusting the phosphating solution, but this adjustment cycle is long. On the other hand, it can be solved by increasing the contact area between the phosphating solution and the air, so that the Fe 2+ The ions are oxidized to Fe under the action of oxygen. 3 + ions, including Fe 3+ The ions react with the phosphate radicals in the phosphating solution to form iron phosphate precipitation, which is then converted into sediment. The specific chemical formula of the aeration reaction is:

[0031] 2Fe 2+ +O2+4H + →2Fe 3+ +2H2O

[0032] It can be seen that the phosphating liquid treatment system of the present invention increases the contact area between the phosphating liquid and the air through the aeration unit 230, thereby making the Fe 2+The ions are converted into sediments through full oxidation, and then the sediment component 300 is used to filter the sediments in the phosphating solution. The filtered phosphating solution can be recycled into the phosphating tank 100. The whole process forms a cycle, and the phosphating tank 100 does not need to stop working, so as to improve production efficiency.

[0033] In addition, it should be noted that a first liquid pump is provided between the first liquid outlet 110 and the first liquid inlet 210, for pumping the phosphating liquid in the phosphating tank 100 into the aeration container 200; a second liquid pump is provided between the second liquid outlet 220 and the sediment assembly 300, for pumping the oxidized phosphating liquid in the aeration container 200 into the sediment assembly 300 for filtration. The types and quantities of the first liquid pump and the second liquid pump are not specifically limited here, and can meet the requirements of this solution.

[0034] In some embodiments, reference Figure 1 The aeration unit 230 includes a plurality of aeration units 231, and the plurality of aeration units 231 are arranged at intervals along the flow direction of the phosphating liquid in the aeration container 200. It can be understood that when the phosphating liquid flows between the aeration units 231, the contact area between the phosphating liquid and the air is greatly increased and the contact time is also greatly prolonged, which is beneficial to the removal of Fe in the phosphating liquid. 2+ ions are converted to Fe 3+ ion.

[0035] In some embodiments, reference Figure 2 The aeration unit 231 has an aeration plate 231a and an overflow trough 231b, wherein the overflow trough 231b is arranged along the circumference of the aeration plate 231a, and the aeration plate 231a is provided with a through hole 231c for the phosphating solution to pass through. The length of the overflow trough 231b depends on the flow rate of the required phosphating solution, and the through holes 231c are evenly distributed on the aeration plate 231a, and can be circular, polygonal, or irregular in shape. The size of the through holes 231c can be determined according to the actual flow rate of the required phosphating solution. It can be understood that when the phosphating solution enters the aeration container 200, it needs to pass through multiple aeration units 231, and then enter the sediment assembly 300 through the second liquid outlet 220 for filtration. When the phosphating liquid passes through the aeration unit 231, the phosphating liquid will flow out through the through hole 231c set at the bottom of the aeration unit 231 and enter the next aeration unit 231. In addition, when the phosphating liquid exceeds the overflow groove 231b, a part of the phosphating liquid can flow into the next aeration unit 231 through the overflow groove 231b, thereby increasing the contact area between the phosphating liquid and the air, so that the Fe 2+ Ions can be fully oxidized to Fe 3+That is to say, the design of the overflow groove 231b and the through hole 231c makes the flow path of the phosphating solution in the tower more complicated, increasing the contact area with the air, thereby improving the oxidation efficiency. In addition, the overflow groove 231b prolongs the residence time of the phosphating solution on the tower plate, which is beneficial to Fe 2+ Complete oxidation of ions.

[0036] In some embodiments, reference Figure 1 , the aeration unit 231 has a connection portion 231d connected to the inner wall of the aeration container 200, and the other end of the aeration unit 231 relative to the connection portion 231d forms a gap 232 with the inner wall of the aeration container 200; the connection portion 231d of two adjacent aeration units 231 is arranged corresponding to the gap 232. That is to say, in the aeration container 200, the aeration units 231 are arranged alternately left and right, so that the flow direction of the phosphating liquid will change when it passes through each layer of aeration units 231. This change in flow direction forces the phosphating liquid to follow a more complex movement path in the aeration unit 231, thereby promoting a more complete mixing of gas and liquid. This mixing method can increase the contact area between the phosphating liquid and the air and improve the oxidation efficiency compared to a single direction flow. In addition, the left-right alternating tower plate layout makes the falling path of the phosphating liquid longer, and correspondingly increases the time for the phosphating liquid to flow from the top to the bottom of the aeration container 200. Such a design effectively prolongs the gas-liquid contact time, which is Fe 2+ The oxidation of the ions is provided with more sufficient time, thereby improving the completeness of the oxidation.

[0037] In some embodiments, the aeration unit 231 is made of PVC. It is understood that PVC (polyvinyl chloride) is a plastic material that is resistant to chemical corrosion, acid and alkali. PVC itself is corrosion-resistant and has sufficient mechanical properties. It can not only improve durability and stability, but also is easy to process, low cost, and light weight. It is an ideal choice for handling corrosive chemical liquids such as phosphating liquid.

[0038] In some embodiments, reference Figure 1 The aeration container 200 is provided with a distributor 240, which is connected to the first liquid inlet 210 and is used to control and disperse the phosphating liquid introduced into the aeration container 200. The distributor 240 effectively improves the dispersion effect of the phosphating liquid in the aeration tower, thereby increasing the contact area between the phosphating liquid and the air during the entire treatment process. Further improve the removal of Fe 2+ The efficiency of ions.

[0039] In some embodiments, reference Figure 1The aeration container 200 is provided with a first air inlet 250 and an air outlet 260, wherein the first air inlet 250 is located between the aeration part 230 and the second liquid outlet 220, and the air outlet 260 is located at one end of the first liquid inlet 210; the phosphating tank 100 is provided with a second air inlet, and the air outlet 260 is connected to the second air inlet. The air entering through the first air inlet 250 is fully in contact with the flowing phosphating liquid, and the Fe 2+ Ion oxidation provides necessary oxygen to improve oxidation efficiency. The gas outlet 260 can discharge the gas accumulated in the aeration container 200, and fresh air is added by the first air inlet 250. Such a circulation and renewal mechanism ensures that the oxygen supply is always in a relatively ideal state. In addition, the first air inlet 250 is located below the aeration part 230, and the air outlet 260 is located at the upper end of the aeration container 200. It can be understood that the air intake direction is different from the flow direction of the phosphating solution to further improve the oxidation effect.

[0040] In some embodiments, the inner surface of the aeration container 200 is sprayed with a Teflon coating. The friction coefficient of the Teflon (i.e., polytetrafluoroethylene PTFE) surface is extremely low, which helps to reduce the friction resistance of the fluid when it flows in the container. It has extremely strong non-adhesiveness. It is understandable that the sediment will not be deposited on the inner wall of the aeration container 200, which facilitates the cleaning and maintenance of the aeration container 200. In addition, the Teflon coating also has extremely strong corrosion resistance and temperature resistance, which prevents the phosphating liquid from corroding and damaging the aeration container 200, thereby extending the service life of the equipment.

[0041] The filter press unit includes a filter press 310 and a pressure gauge 320, wherein the filter press 310 is preferably a plate-frame filter press 310, and the pressure gauge 320 is used to detect the pressure change of the filter press 310. When the phosphating solution containing sediment enters the filter press 310, the sediment is completely separated from the phosphating solution, and the separated phosphating solution is sent to the phosphating tank 100 for recycling. In some embodiments, the sediment assembly 300 includes a plurality of filter press units, and the plurality of filter press units are arranged in parallel (not shown). The plurality of filter press units in parallel can be pressed at the same time or individually. When the plurality of filter press units in parallel work at the same time, the efficiency of the filter press can be improved. When the phosphating solution is more and needs emergency treatment, such a method can be adopted; when the plurality of filter press units in parallel work individually, it is judged by the pressure gauge 320 that when the sediment in the working filter press unit is full, the filter press unit is switched to the prepared filter press unit for filter press, and the sediment is removed and then the next prepared filter press process is entered. It can be understood that such an operation mode allows the filtration process to be carried out uninterruptedly. A group of plate and frame filter presses 310 accumulate sediment during the filtration process. When this group of equipment needs to stop to clean the sediment, another group of equipment can immediately take over its work, thereby realizing continuous operation without stopping and improving production efficiency.

[0042] The above is a specific description of the preferred implementation of the utility model, but the invention of the utility model is not limited to the described embodiments. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A phosphating solution treatment system for removing Fe from phosphating solution 2+ ions, characterized in that include: A phosphating tank, used to contain a phosphating solution, the phosphating tank having a first liquid outlet and a second liquid inlet; An aeration container, wherein a first liquid inlet and a second liquid outlet are respectively provided at both ends of the aeration container, wherein the first liquid outlet is connected to the first liquid inlet, and an aeration portion is provided in the aeration container away from the first liquid inlet, wherein the aeration portion is used to increase the contact area between the phosphating solution and the air, so that the Fe in the phosphating solution 2+ The ions are converted into sediment by full oxidation; A sediment component, one end of which is connected to the second liquid outlet for filtering the sediment in the phosphating solution, and the other end of which is connected to the second liquid inlet for recovering the filtered liquid into the phosphating tank.

2. The phosphating liquid treatment system according to claim 1, characterized in that: The aeration part includes a plurality of aeration units, and the plurality of aeration units are arranged at intervals along the flow direction of the phosphating liquid in the aeration container.

3. The phosphating liquid treatment system according to claim 2, characterized in that: The aeration unit comprises an aeration plate and an overflow groove, wherein the overflow groove is arranged along the circumference of the aeration plate, and the aeration plate is provided with a through hole for the phosphating solution to pass through.

4. The phosphating liquid treatment system according to claim 2, characterized in that: The aeration unit has a connection portion connected to the inner wall of the aeration container, and a gap is formed between the other end of the aeration unit relative to the connection portion and the inner wall of the aeration container; the connection portions of two adjacent aeration units are arranged correspondingly to the gap.

5. The phosphating liquid treatment system according to claim 2, characterized in that: The aeration unit is made of PVC material.

6. The phosphating solution treatment system according to claim 1, characterized in that: A distributor is arranged in the aeration container, and the distributor is connected with the first liquid inlet, and is used for controlling and dispersing the phosphating liquid introduced into the aeration container.

7. The phosphating liquid treatment system according to any one of claims 1 to 6, characterized in that: The aeration container is provided with a first air inlet and an air outlet, the air inlet is located between the aeration part and the second liquid outlet, and the air outlet is located at one end of the liquid inlet; the phosphating tank is provided with a second air inlet, and the air outlet is connected to the second air inlet.

8. The phosphating liquid treatment system according to any one of claims 1 to 6, characterized in that: The inner surface of the aeration container is sprayed with a Teflon coating.

9. The phosphating liquid treatment system according to any one of claims 1 to 6, characterized in that: The sediment component comprises a plurality of filter pressing units, and the plurality of filter pressing units are arranged in parallel.

10. The phosphating liquid treatment system according to claim 9, characterized in that: The filter press unit comprises a filter press and a pressure gauge for detecting pressure changes of the filter press.

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