A device for the purification of brine from nickel ions for chlor-alkali processes

Abstract

The utility model provides a kind of for chlor-alkali process's brine refining nickel ion adsorption device, including several parallel adsorption tanks, the adsorption tank bottom is fixed with supporting base and plays the supporting effect, adsorption chamber is equipped in the adsorption tank, the adsorption chamber top is equipped with sealing top cover, the adsorption tank side is equipped with several open outward opening grooves, the opening groove position is from top to bottom array distribution.This scheme is innovatively designed as multiple parallel adsorption tanks by traditional monolithic fixed bed, and independently extracted and replaced adsorbent drawer is arranged in each adsorption tank, when local resin saturation or deactivation, only need to isolate single adsorption tank and replace specific adsorbent drawer, without stopping, emptying and manual tower cleaning to whole device.

Description

Technical Field

[0001] This utility model relates to the field of brine refining technology in the chlor-alkali industry, specifically to a nickel ion adsorption device for brine refining in the chlor-alkali process. Background Technology

[0002] In the chlor-alkali process using ion-exchange membranes, the purity of the brine directly determines the energy consumption level of the electrolysis step and the lifespan of the ion-exchange membrane. Trace amounts of nickel ions are a key factor causing abnormal voltage increases in the electrolyzer, earning them the nickname "energy killer." During electrolysis, nickel ions deposit on the ion-exchange membrane, significantly increasing the cell voltage and resulting in substantial energy waste.

[0003] Traditional resin towers are large, fixed-bed structures. When the resin becomes saturated or deactivated due to poisoning, the entire tower must be replaced. This process is time-consuming and labor-intensive, requiring complex steps such as shutdown, evacuation, and manual cleaning, impacting production continuity. More importantly, due to limitations in water flow distribution and adsorption kinetics, the saturation level of the resin within the tower is often uneven, exhibiting a "breakthrough" zone. Complete replacement means that a large amount of resin that is not yet fully saturated is discarded, leading to wasted adsorption capacity and increased operating costs.

[0004] Therefore, existing fixed-bed adsorption devices exhibit prominent problems when dealing with nickel ions, a specific impurity, such as inconvenient replacement, low efficiency, serious waste, and rough maintenance. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a novel adsorption device that enables quick disassembly and replacement of adsorption units, improves resin utilization efficiency and mass transfer effect, and allows for precise monitoring of the adsorption state, thereby achieving the goals of accurate replacement, cost reduction and efficiency improvement.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a nickel ion adsorption device for brine refining in a chlor-alkali process, comprising several parallel adsorption tanks. Each adsorption tank has a fixed support base at its bottom for support. Each adsorption tank contains an adsorption chamber, and the top of the adsorption chamber is fitted with a sealed top cover. The sides of each adsorption tank have several outward-facing opening slots arranged in an array from top to bottom. Two guide rails are fixedly installed on both sides of each opening slot, and the guide rails on both sides are symmetrically positioned. An adsorbent drawer that can be moved and removed is installed within each opening slot. The adsorbent drawer contains a vertically connected drop chamber, and the drop chamber contains several sieve tubes.

[0007] Preferably, a movable handle is fixedly provided on one side of the outer end face of the adsorbent drawer.

[0008] Preferably, the bottom of the adsorption chamber is connected to an output pipe, which serves to output brine.

[0009] Preferably, the top of the sealed top cover is connected to an input main pipe.

[0010] Preferably, a connecting pipe is installed on one side of the input main pipe.

[0011] Preferably, the connecting pipes on each side are connected by the same parallel pipe, and one end of the parallel pipe is connected to a brine input pipe for inputting the brine to be treated.

[0012] Preferably, a control solenoid valve is installed at the connection position between the connecting pipe on each side and the parallel pipe, and the control solenoid valve has the effect of intelligent control of on / off switching.

[0013] This invention provides a nickel ion adsorption device for brine purification in chlor-alkali processes. It has the following beneficial effects: 1. This solution innovatively designs the traditional integral fixed bed into multiple parallel adsorption tanks, and sets up an independently replaceable adsorbent drawer in each adsorption tank. When the local resin is saturated or deactivated, it is only necessary to isolate a single adsorption tank and replace the specific adsorbent drawer, without having to shut down, empty, or manually clean the entire unit.

[0014] 2. In this scheme, the brine is forced to pass through multiple arrayed thin bed layers in sequence, forming a stepped purification process with multiple adsorptions. This results in extremely uniform water flow distribution and effectively avoids the waste of resin adsorption capacity caused by the phenomenon of prior penetration and channeling in traditional tall fixed beds. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of the present utility model; Figure 2 This is a schematic diagram of the main structure of this utility model; Figure 3 This is a front view structural diagram of the present utility model; Figure 4 This utility model Figure 3 A cross-sectional view along the AA direction.

[0016] In the diagram: 101, Adsorption tank; 102, Support base; 103, Guide rail; 104, Opening slot; 105, Adsorbent drawer; 106, Sealed top cover; 107, Input main pipe; 108, Connecting pipe; 109, Parallel pipe; 110, Moving handle; 111, Control solenoid valve; 112, Brine input pipe; 113, Output pipe; 114, Adsorption chamber; 115, Drop chamber; 116, Screen tube. Detailed Implementation

[0017] This utility model provides a brine refining nickel ion adsorption device for chlor-alkali processes, such as... Figure 1-4 As shown, the device includes several adsorption tanks 101 standing side by side. A support base 102 is fixedly provided at the bottom of each adsorption tank 101 to provide support. An adsorption chamber 114 is provided inside each adsorption tank 101. A sealed top cover 106 is installed on the top of the adsorption chamber 114. Several outward-facing opening slots 104 are provided on the side of each adsorption tank 101. The opening slots 104 are arranged in an array from top to bottom. Two guide rails 103 are fixedly provided on both sides of each opening slot 104. The guide rails 103 on both sides are symmetrically arranged. An adsorbent drawer 105 that can be moved and pulled out is installed inside each opening slot 104. The adsorbent drawer 105 has a vertically connected drop cavity 115 inside. Several sieve tubes 116 are provided inside the drop cavity 115.

[0018] It should be further explained that the sieve tube 116 is made of a three-dimensional wound wire sieve tube and is filled with a special nickel ion adsorption resin. When the brine enters from the top, it is forced to pass evenly through each thin adsorbent bed layer through multiple arrays of adsorbent drawers 105, and undergoes multiple adsorption processes.

[0019] Furthermore, a movable handle 110 is fixedly provided on one side of the outer end face of the adsorbent drawer 105.

[0020] Furthermore, the bottom of the adsorption chamber 114 is connected to an output pipe 113, which serves to output brine.

[0021] Furthermore, the top of the sealed top cover 106 is connected to an input main pipe 107.

[0022] Furthermore, a connecting pipe 108 is installed on one side of the input main pipe 107.

[0023] Furthermore, the connecting pipes 108 on each side are connected by the same parallel pipe 109, and one end of the parallel pipe 109 is connected to a brine input pipe 112 for inputting brine to be treated.

[0024] Furthermore, a control solenoid valve 111 is installed at the connection position of the connecting pipe 108 on each side and the parallel pipe 109, and the control solenoid valve 111 plays the role of intelligent control of on and off.

[0025] When using this solution, the brine input pipe 112 is connected to the brine supply system in the chlor-alkali process to ensure that each adsorption tank 101 is arranged in parallel through the parallel pipe 109.

[0026] During startup, the flow rate of each connecting pipe 108 is adjusted by controlling the solenoid valve 111, so that the brine to be treated enters the parallel pipe 109 through the brine input pipe 112 and is evenly distributed to the input main pipe 107 of each adsorption tank 101. The brine then enters the adsorption chamber 114 from the sealed top cover 106 and flows from top to bottom.

[0027] During the flow process, the brine is forced to pass through the screen tubes 116 in each layer of adsorbent drawer 105 in sequence. Since the screen tubes 116 adopt a three-dimensional wire-wound structure and are filled with highly selective nickel ion adsorption resin, the nickel ions are efficiently adsorbed when the brine passes through each thin bed layer, thereby achieving multiple step-by-step purification. This design overcomes the problem of uneven water flow distribution in traditional fixed beds and ensures full utilization of adsorption capacity. The purified brine finally collects at the bottom of the adsorption chamber 114 and is discharged through the output pipe 113 to enter the subsequent electrolysis process.

[0028] After running for a period of time, the saturation state of the adsorbent can be determined by monitoring the nickel ion concentration of the brine in the output pipe 113 or the change in the voltage of the electrolytic cell. If the resin in a certain adsorbent drawer 105 is saturated, simply close the corresponding control solenoid valve 111 to cut off the liquid inlet of the adsorption tank 101. The operator can then use the moving handle 110 to pull the specific adsorbent drawer 105 out of the opening slot 104 along the guide rail 103 for partial replacement. The replacement process does not require stopping the machine to empty the tank; only a single adsorption tank needs to be isolated briefly, which significantly improves production continuity. After the new drawer is installed, the operation can be resumed by reopening the control solenoid valve 111.

[0029] In addition, since each adsorbent drawer 105 is independently replaceable and the bed is thin and has low resistance, the capacity waste caused by uneven resin saturation in traditional devices is avoided. The control solenoid valve 111 can also realize intelligent start-stop and flow optimization according to the brine treatment volume or impurity concentration, further reducing operating energy consumption.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nickel ion adsorption device for brine refining in a chlor-alkali process, comprising a plurality of parallel adsorption tanks (101), characterized in that: The bottom of the adsorption tank (101) is fixedly provided with a support base (102) for support. The adsorption tank (101) is provided with an adsorption chamber (114). The top of the adsorption chamber (114) is installed with a sealed top cover (106). The side of the adsorption tank (101) is provided with several outward-facing opening slots (104). The opening slots (104) are arranged in an array from top to bottom. Two guide rails (103) are fixedly provided on both sides of the opening slots (104). The guide rails (103) on both sides are symmetrically arranged. An adsorbent drawer (105) that can be moved and pulled out is installed in the opening slots (104). The adsorbent drawer (105) is provided with a vertically connected drop cavity (115). The drop cavity (115) is provided with several sieve tubes (116).

2. The brine refining nickel ion adsorption device for chlor-alkali process according to claim 1, characterized in that: A movable handle (110) is fixedly provided on one side of the outer end face of the adsorbent drawer (105).

3. The brine refining nickel ion adsorption device for chlor-alkali process according to claim 1, characterized in that: The bottom of the adsorption chamber (114) is connected to an output pipe (113), which serves to output brine.

4. The brine refining nickel ion adsorption device for chlor-alkali process according to claim 1, characterized in that: The top of the sealed top cover (106) is connected to an input main pipe (107).

5. A nickel ion adsorption device for brine refining in a chlor-alkali process according to claim 4, characterized in that: A connecting pipe (108) is installed on one side of the input main pipe (107).

6. A brine refining nickel ion adsorption device for chlor-alkali processes according to claim 5, characterized in that: The connecting pipes (108) on each side are connected by the same parallel pipe (109), and one end of the parallel pipe (109) is connected to a brine input pipe (112) for inputting brine to be treated.

7. A brine refining nickel ion adsorption device for chlor-alkali processes according to claim 6, characterized in that: A control solenoid valve (111) is installed at the connection position between the connecting pipe (108) on each side and the parallel pipe (109). The control solenoid valve (111) has the effect of intelligent control of on / off.

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