Equipment for improving metal ion adsorption capacity of chelating resin

Abstract

The utility model provides equipment for improving metal ion adsorption capacity of chelating resin, which comprises a resin absorption tower, a conveying hole, a water distributor, a water outlet valve and an exhaust valve are arranged on the resin absorption tower, a water inlet valve is arranged on the water distributor, and the particle size of the chelating resin in the resin absorption tower is 0.4 mm. The equipment further comprises a movable resin adding device, the movable resin adding device is used for being matched with the conveying hole, and the pressure of 0.4 MPa is adopted for providing displacement power for the chelating resin. More metal ions can be adsorbed in the resin absorption tower, the lower the content of the metal ions in the saline water is, the smaller the damage to the electrolytic bath is, and the higher the quality of the produced product is.

Description

Technical Field

[0001] The utility model relates to the technical field of chlor-alkali industrial devices, and in particular to a device for improving the metal ion adsorption capacity of a chelating resin. Background Art

[0002] The chlor-alkali industry also refers to the method of using saturated salt water to produce chlorine, hydrogen and caustic soda. The industry uses the method of electrolyzing saturated NaCl solution to produce NaOH, Cl2 and H2, and uses them as raw materials to produce a series of chemical products, which is called the chlor-alkali industry. The chlor-alkali industry is one of the most basic chemical industries. In addition to being used in the chemical industry itself, its products are also widely used in light industry, textile industry, metallurgical industry, petrochemical industry and public utilities.

[0003] In my country, the chlor-alkali industry mainly adopts two production processes: diaphragm method and ion membrane exchange method. The main products of the chlor-alkali industry include caustic soda, polyvinyl chloride (PVC), chlorine, hydrogen, etc. Chlor-alkali products are mainly used in the manufacture of organic chemicals, papermaking, soap, glass, chemical fiber, plastics and other fields.

[0004] In recent years, China's chlor-alkali industry has developed rapidly. Existing chlor-alkali enterprises have expanded their production capacity, and some new enterprises have also been put into production one after another. The production capacity has increased rapidly, and the chlor-alkali industry has shown an accelerated trend of development towards scale and high technology content. While the production capacity of China's chlor-alkali industry has increased rapidly, the technology has also made great progress, the number of large-scale devices has increased, and the technical level of the devices has improved. China's chlor-alkali industry has shown a trend of large-scale and high-tech development.

[0005] Because of the particularity of the electrolytic cell device, the quality requirements for the influent are high, especially the metal ions (calcium, magnesium, etc.) therein, so a resin tower is generally set in front of the electrolytic cell, in which chelating resin is filled to reduce the metal ion content in the brine. At present, the chelating resin is generally poured into the resin tower manually, which is laborious to operate. Moreover, most of the existing chelating resins have large particle sizes, small exchange capacity, and short regeneration cycle, resulting in poor ability to adsorb metal ions.

[0006] Therefore, there is room for improvement. The utility model provides a method and a device for improving the ability of chelating resin to adsorb metal ions. Utility Model Content

[0007] In view of the shortcomings of the prior art, the utility model aims to provide a device for improving the ability of chelating resin to adsorb metal ions. The specific scheme is as follows:

[0008] A device for improving the metal ion adsorption capacity of a chelating resin, the device comprises a resin absorption tower, the resin absorption tower is provided with a conveying hole, a water distributor, a water outlet valve, and an exhaust valve, the water distributor is provided with a water inlet valve, the particle size of the chelating resin in the resin absorption tower is 0.4 mm, the device also comprises a mobile resin adding device, the mobile resin adding device is used to cooperate with the conveying hole, and adopts a pressure of 0.4 MPa to provide displacement power to the chelating resin.

[0009] Furthermore, the mobile resin adding device is connected to a 0.4MPa water source to flush the chelating resin, and at the same time, the chelating resin is flushed into the resin absorption tower.

[0010] Further, the mobile resin adding device includes a resin hopper, an ejector, a quick connector, a mobile trolley, and a transfer hose;

[0011] The ejector is fixedly mounted on a mobile trolley, and a double-head interface is installed at the discharge port of the resin hopper, which is respectively connected to the ejector and the quick connector;

[0012] The other end of the injector is connected to the transfer hose, and the quick connector is used to connect to a 0.4MPa water source.

[0013] Furthermore, a filter component is provided inside the resin absorption tower, and a plurality of filter caps evenly distributed are embedded on the filter component.

[0014] Furthermore, a discharge gap with an adjustable size is formed between the filter component and the inner wall of the resin absorption tower.

[0015] Furthermore, the width of the discharge gap ranges from 0.3 to 0.6 mm.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] (1) In the present invention, when it is necessary to load the chelating resin, the chelating resin is gradually introduced into the resin absorption tower from the conveying hole by the mobile resin adding device. By adding the chelating resin with small particle size in the resin absorption tower, the exchange capacity of the resin can be increased and the regeneration cycle can be increased. When it is necessary to perform the adsorption process, the primary brine is first passed through the resin absorption tower of the present invention and then enters the electrolytic cell for electrolysis to produce the product.

[0018] Under set conditions, the brine after passing through the resin absorption tower of the utility model can absorb more metal ions in the resin absorption tower. The lower the metal ion content in the brine, the less damage to the electrolytic cell, and the higher the quality of the product produced.

[0019] (2) By setting up a resin absorption tower and a mobile resin adding device, the chelating resin can be continuously transported into the resin absorption tower, which is easy to operate and saves manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall schematic diagram of the resin absorption tower of the utility model;

[0021] Figure 2 It is a schematic diagram of the connection between the resin absorption tower and the mobile resin adding device;

[0022] Figure 3 Schematic cross-section of a resin absorption tower showing the discharge pores.

[0023] Figure numerals: 1. resin absorption tower; 2. conveying hole; 3. water distributor; 4. water outlet valve; 5. exhaust valve; 6. water inlet valve; 7. mobile resin adding device; 71. resin funnel; 72. ejector; 73. quick connector; 74. mobile trolley; 75. transfer hose; 8. unloading gap; 9. filter component; 91. bump; 10. filter cap. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation methods of the present invention are not limited thereto.

[0025] Based on the defects existing in the existing chlor-alkali industry, the utility model proposes a device for improving the metal ion adsorption capacity of chelating resin, and the device can improve the metal ion adsorption capacity by combining with a method of reducing the particle size.

[0026] Specifically, the device for improving the metal ion adsorption capacity of the chelating resin provided by the utility model comprises a resin absorption tower 1 and a mobile resin adding device 7 .

[0027] like Figure 1 The resin absorption tower 1 can adopt the existing structure. In order to realize the necessary functions of the resin absorption tower 1, the resin absorption tower 1 is provided with a conveying hole 2, a water distributor 3, a water outlet valve 4, and an exhaust valve 5. The water distributor 3 is provided with a water inlet valve 6, both of which are arranged at the upper part of the resin absorption tower 1. The water distributor 3 and the water inlet valve 6 can cooperate to realize water supply to the resin absorption tower 1. The water outlet valve 4 is arranged at the bottom of the resin absorption tower 1 for drainage, and the exhaust valve 5 is arranged at the upper part of the resin absorption tower 1 for exhaust.

[0028] The delivery hole 2 is arranged on the side of the resin absorption tower 1 , and is used to cooperate with the mobile resin adding device 7 to fill the resin absorption tower 1 with chelating resin.

[0029] The mobile resin adding device 7 is used to cooperate with the conveying hole 2, and adopts a pressure of 0.4MPa to provide displacement power for the chelating resin. In this embodiment, the mobile resin adding device 7 specifically adopts a water source connected to 0.4MPa to flush the chelating resin, and at the same time, the chelating resin is flushed into the resin absorption tower 1.

[0030] like Figure 2 Specifically, the mobile resin adding device 7 includes a resin funnel 71, an injector 72, a quick connector 73, a mobile trolley 74, and a transfer hose 75. The injector 72 is fixedly mounted on the mobile trolley 74, and a double-head interface is installed at the discharge port of the resin funnel 71, which is respectively connected to the injector 72 and the quick connector 73, and the other end of the injector 72 is connected to the transfer hose 75, and the quick connector 73 is used to access a 0.4MPa water source.

[0031] Before filling the chelating resin, empty the interior of the resin absorption tower 1, remove all the residues inside, open the delivery hole 2, check whether the internal parts of the equipment are damaged, ensure that there is no resin leakage, and add water from the top of the resin absorption tower 1 to a water level of about 1 / 3 of the equipment height.

[0032] When the chelate resin needs to be loaded, a water source of 0.4 MPa is connected to the quick connector 73, and the transfer hose 75 is placed in the delivery hole 2. The water source valve is opened, and a hydraulic injection cycle is established, and the chelate resin with a suitable particle size is poured into the resin hopper 71, and the vacuum suction of the resin ejector 72 is utilized to suck the chelate resin into the resin absorption tower 1.

[0033] After the chelating resin is loaded, the delivery hole 2 is closed, and a delivery hole 2 gasket is generally replaced. The exhaust valve 5 and the water inlet valve 6 are opened, and the resin absorption tower 1 is filled with water. After the exhaust valve 5 overflows, the exhaust valve 5 is closed to stop the top water inlet. Afterwards, the chelating resin is backwashed for 30 minutes.

[0034] like Figure 3 It should be noted that, in order to ensure that the inside of the resin absorption tower 1 can maintain a certain flow rate and prevent the internal chelating resin from flowing out, a filter component 9 is provided in the resin absorption tower 1, which is arranged close to the bottom as a whole. The filter component 9 is disc-shaped as a whole, and the outer surface is welded to the inside of the resin absorption tower 1 by forming a plurality of protrusions 91. A plurality of filter caps 10 evenly distributed are embedded on the top surface. The filter cap 10 is an existing structure, and liquid can flow away from the filter cap 10, while the chelating resin will be blocked by the filter cap 10, and is also used to cooperate in completing the backwashing of the chelating resin.

[0035] Optimized, a discharge gap 8 is also formed between the filter element 9 and the resin absorption tower 1 inwall, for taking out the resin that needs to be replaced from the resin absorption tower 1. Due to the provision of projection 91, several discharge gaps 8 are provided around the circumference of the filter element 9, and the discharge gap 8 can be adjusted in size, and the width range of the discharge gap 8 is 0.3-0.6mm. When the resin absorption tower 1 works normally, the width of the discharge gap 8 is set to 0.3mm, which is less than the particle diameter of the resin, so that the resin is prevented from falling. When the resin in the resin absorption tower 1 needs to be replaced, the width of the discharge gap 8 is set to 0.5mm or 0.6mm, which is greater than the particle diameter of the resin, so that the resin is convenient to fall to the bottom of the resin absorption tower 1, and then discharged from.

[0036] The discharge gap 8 can be adjusted by embedding an elastic rubber strip in the outer edge of the filter component. The rubber strip is pressed by a support rod by the staff. When it is compressed in the outer edge of the filter component, the width of the discharge gap 8 increases. When the support rod is removed, the rubber strip can be released, so that the width of the discharge gap 8 is reduced.

[0037] When the rubber strip equipment is in use: select a chelate resin with a particle size within the range of 0.36-0.44 mm. Send the chelate resin with a particle size within the range into the resin absorption tower 1, and fill the resin absorption tower 1 with water and exhaust at the same time, then backwash the chelate resin for 25-35 minutes. After the backwash is completed, control the chelate resin inside the resin absorption tower 1 to be at a pH of 9-11 and a temperature of 60-80° C. to perform the adsorption process.

[0038] It should be noted that this type of resin absorption tower 1 is suitable for the chlor-alkali industry in the chemical industry, especially in the step of treating primary brine before the electrolytic cell, so as to reduce the metal ions in the primary brine, meet the water inlet standards of the electrolytic cell, and reduce damage to the electrolytic cell.

[0039] Wherein, the particle diameter of chelating resin preferably adopts 0.4mm. In the prior art, the particle diameter of chelating resin is generally about 0.63mm, compared with the prior art, the particle diameter of chelating resin of the utility model is smaller, has larger specific surface area, makes resin and primary salt water can carry out more contact, improves the exchange capacity of resin, improves the diffusion rate of primary salt water. In this way, the chelating resin in the resin absorption tower 1 just can adsorb more metal ions in the primary salt water.

[0040] Secondly, when the pH is between 9 and 11 and the temperature is between 60 and 80°C, the pH value and temperature can increase the rate of ion exchange without affecting the stability of the chelating resin, and at the same time, can also improve the ion selective adsorption capacity of the chelating resin.

[0041] It should be noted that when the chelating resin is fed into the resin absorption tower 1 , it is flushed with a water source having a pressure of 0.4 MPa, and the chelating resin is flushed into the resin absorption tower 1 at the same time.

[0042] It should be noted that the chelate resin capacity in the resin absorption tower 1 reaches 70-90%, under which the time for the primary salt water to contact with the chelate resin can be guaranteed to be sufficient.

[0043] Based on the above content, the utility model proposes the following embodiments and comparative examples. The chelating resin and reaction conditions in the resin absorption tower 1 in each embodiment and comparative example are different. Primary brine is used to perform adsorption process on the embodiments and comparative examples, and tests are performed, which are specifically described as follows:

[0044] Feed index of primary brine A:

[0045] NaCl(g / L) 300 Ca+Mg(ppb) 583 Sr(ppb) 115 Ba(ppb) 98 Fe(ppb) 10 pH 9 Free Chlorine 0

[0046] Based on the above-mentioned primary brine A, an embodiment and a comparative example are proposed.

[0047] Embodiment (corresponding to the utility model): select a chelating resin with a particle diameter within the scope of 0.36mm, send the chelating resin with particle diameter that meets the scope in the resin absorption tower 1, fill the resin absorption tower 1 with water and exhaust simultaneously, backwash the resin for 30 minutes afterwards, after backwashing is completed, control the chelating resin inside the resin absorption tower 1 to be in a pH state of 11 and a temperature state of 80 ℃ to carry out the adsorption process.

[0048] Comparative Example (corresponding to prior art): The difference from the embodiment is that the chelating resin adopts 0.6 mm, the pH value adopts 11, and the temperature adopts 80°C.

[0049] In the embodiment and comparative example, after the above-mentioned primary brine A is adsorbed, the index test is performed on the outlet of the resin absorption tower 1, and the specific results are as follows:

[0050] Table 1

[0051]

[0052] As can be seen from Table 1, the concentration of metal ions in the embodiment is lower than that in the comparative example because the particle size of the chelating resin in the comparative example is larger than the particle size range of the chelating resin of the present invention, resulting in a larger metal ion concentration in the primary brine A after leaving the resin absorption tower 1.

[0053] It can be seen that a larger particle size of the chelating resin will affect the metal ion concentration in the primary brine A after leaving the resin absorption tower 1, and in the utility model, the particle size of the chelating resin is not as small as possible, preferably 0.4 mm, and the pH value and temperature are preferably 11 and 80°C.

[0054] In summary, in the present invention, the use of a chelating resin with a small particle size can reduce the metal ion content in the primary brine to a certain extent, the quality of the product will be better, and the damage to the electrolytic cell will be less. The corresponding regeneration period of the chelating resin is also extended. The higher the quality of the primary brine, the longer the regeneration period can be extended. In actual situations, it can be extended by 3-10 days.

[0055] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A device for improving the metal ion adsorption capacity of a chelating resin, characterized in that: The device comprises a resin absorption tower (1), wherein the resin absorption tower (1) is provided with a conveying hole (2), a water distributor (3), a water outlet valve (4), and an exhaust valve (5), wherein the water distributor (3) is provided with a water inlet valve (6), wherein the particle size of the chelate resin in the resin absorption tower (1) is 0.4 mm, and wherein the device further comprises a mobile resin adding device (7), wherein the mobile resin adding device (7) is used to cooperate with the conveying hole (2) and adopt a pressure of 0.4 MPa to provide a displacement power to the chelate resin.

2. The device for improving the metal ion adsorption capacity of chelating resin according to claim 1, characterized in that: The mobile resin adding device (7) is connected to a 0.4MPa water source to flush the chelate resin, and at the same time, the chelate resin is flushed into the resin absorption tower (1).

3. The device for improving the metal ion adsorption capacity of chelating resin according to claim 1, characterized in that: The mobile resin adding device (7) comprises a resin funnel (71), an ejector (72), a quick connector (73), a mobile trolley (74), and a transfer hose (75); The ejector (72) is fixedly mounted on the mobile trolley (74), and a double-head interface is installed at the discharge port of the resin funnel (71), and the double-head interface is respectively connected to the ejector (72) and the quick connector (73); The other end of the ejector (72) is communicated with the transfer hose (75), and the quick connector (73) is used to access a 0.4 MPa water source.

4. The device for improving the metal ion adsorption capacity of chelating resin according to claim 1, characterized in that: A filtering component (9) is provided inside the resin absorption tower (1), and a plurality of evenly distributed filter caps (10) are embedded in the filtering component (9).

5. The device for improving the metal ion adsorption capacity of chelating resin according to claim 4, characterized in that: A discharge gap (8) with an adjustable size is formed between the filter component (9) and the inner wall of the resin absorption tower (1).

6. The device for improving the metal ion adsorption capacity of chelating resin according to claim 4, characterized in that: The width of the discharge gap (8) is in the range of 0.3-0.6 mm.

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