An ammonium chloride separation system for a mixed salt liquor

Abstract

The utility model discloses a kind of ammonium chloride separation systems for miscellaneous salt mother liquor;Belong to miscellaneous salt mother liquor processing technical field;Its technical key points include reaction tank, the upper end of the reaction tank is connected with the feed pipe connected with external mother liquor tank, cooling crystallization component is equipped on the reaction tank, variable speed stirring component is equipped in the reaction tank;When liquid enters into the reaction tank, slowly stir through variable speed stirring component;When cooling crystallization component starts to work, variable speed stirring component improves stirring speed;Vacuum filtration component is equipped in the side of reaction tank, the bottom of the reaction tank is equipped with the discharge pipe connected with vacuum filtration component by valve, and the vacuum filtration component includes detachable filter bag;Filter bag replacement component is equipped above vacuum filtration component;The utility model aims at providing a kind of ammonium chloride separation systems for miscellaneous salt mother liquor for reducing energy consumption, reducing processing cost;For separating ammonium chloride in miscellaneous salt mother liquor.

Description

Technical Field

[0001] This utility model relates to a mixed salt mother liquor treatment system, and more specifically, to an ammonium chloride separation system for mixed salt mother liquor. Background Technology

[0002] Industrial production processes generate large quantities of mother liquor containing ammonium chloride and other salts. Direct discharge not only wastes resources but also causes severe environmental pollution. Currently, the industry primarily uses forced evaporation in evaporators to treat these salts. While this method achieves initial separation, it consumes enormous amounts of energy, resulting in high processing costs and imposing a heavy economic burden on enterprises. Furthermore, this high energy consumption contradicts the national initiatives of energy conservation, emission reduction, and green development. Analysis of the ammonium chloride-containing mother liquor reveals that its main component is ammonium chloride. Ammonium chloride possesses a unique physical property: when the temperature of the salt solution is relatively high, appropriate cooling will cause crystal precipitation. This characteristic provides a theoretical basis and technical feasibility for developing a low-cost method for treating these salts. Utilizing this property, a low-cost ammonium chloride separation system for mother liquor can be developed by designing a reasonable cooling crystallization process, achieving efficient separation of ammonium chloride, reducing energy consumption, and lowering processing costs. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the prior art by providing an ammonium chloride separation system for mixed salt mother liquor that reduces energy consumption and lowers processing costs.

[0004] The technical solution of this utility model is implemented as follows: An ammonium chloride separation system for mixed salt mother liquor includes a reaction tank, the upper end of which is connected to a feed pipe connected to an external mother liquor tank. The reaction tank is equipped with a cooling crystallization component and a variable speed stirring component inside the reaction tank. When the liquid enters the reaction tank, it is slowly stirred by the variable speed stirring component. When the cooling crystallization component starts working, the variable speed stirring component increases the stirring speed.

[0005] A vacuum filtration assembly is provided on one side of the reaction vessel. A discharge pipe connected to the vacuum filtration assembly is provided at the bottom of the reaction vessel via a valve. The vacuum filtration assembly includes a detachable filter bag. A filter bag replacement assembly is provided above the vacuum filtration assembly.

[0006] In the ammonium chloride separation system for mixed salt mother liquor described above, the cooling crystallization assembly includes a cooling jacket installed on the outer wall of the reaction tank. The cooling jacket is connected to an external cooling water circulation system via an inlet pipe, and the inlet pipe is equipped with a corresponding opening adjustment valve.

[0007] In the ammonium chloride separation system for mixed salt mother liquor described above, the variable speed stirring assembly includes a stirring paddle installed in the reaction tank, and a servo motor connected to the stirring paddle is provided at the upper end of the reaction tank; initially, the stirring paddle speed is 40-60 rpm; when the cooling crystallization assembly starts working, the speed gradually increases to 150-200 rpm.

[0008] In the aforementioned ammonium chloride separation system for mixed salt mother liquor, the vacuum filtration assembly includes a separation tank disposed on one side of the reaction tank, a filter bag detachably disposed at the opening end of the separation tank, a support mesh plate disposed inside the separation tank, and a vacuum pump assembly connected to an external liquid recovery tank disposed at the bottom of the separation tank.

[0009] In the ammonium chloride separation system for mixed salt mother liquor described above, the filter bag replacement assembly includes a mobile trolley positioned above the separation tank, a lifting unit at the bottom of the mobile trolley, and a mounting base on the lifting unit; the mounting base has a plurality of telescopic push rods evenly distributed around its circumference, and hooks are provided at the ends of the telescopic push rods; the filter bag opening end is provided with a lifting lug corresponding to each hook.

[0010] An installation ring is provided on the outer wall of the opening end of the separation tank. The installation ring has a clearance notch that corresponds to the hook. The installation ring on both sides of the clearance notch has a positioning post that cooperates with the lifting lug. An arc-shaped pressure block that cooperates with the center of the filter bag is provided at the bottom of the installation base.

[0011] In the ammonium chloride separation system for mixed salt mother liquor described above, the discharge pipe is a flexible hose, and an installation bracket is provided on one side of the reaction tank. The discharge pipe is fixed on the installation bracket, and a flipping bracket is provided at the end of the installation bracket near the separation tank to cooperate with the outlet end of the discharge pipe. In the initial state, the outlet end of the discharge pipe is located above the separation tank. When the filter bag is replaced, the flipping bracket flips the outlet end of the discharge pipe to the outside of the separation tank.

[0012] In the ammonium chloride separation system for mixed salt mother liquor described above, a plurality of first backflushing pipes are evenly distributed circumferentially at the bottom of the reaction tank, and the front end of the first backflushing pipes is inclined downward.

[0013] In the ammonium chloride separation system for mixed salt mother liquor described above, a second backflushing pipe is provided near the bottom of the discharge pipe, with the front end of the second backflushing pipe facing the valve.

[0014] With the above-described structure, the mixed salt mother liquor is transported from the mother liquor tank to the reaction tank via the feed pipe. The variable speed stirring assembly, in conjunction with the cooling crystallization assembly, promotes the movement and collision of ammonium chloride molecules, accelerating the formation of crystal nuclei and the growth of crystals. The mixture of ammonium chloride crystals and mother liquor is fed into the vacuum filtration assembly. Under the action of vacuum suction, the mother liquor passes through the filter bag to form filtrate, which is then discharged to the filtrate recovery tank. The ammonium chloride crystals are retained to form a filter cake on the filter bag. Vacuum filtration can greatly reduce the water content of the solid phase, significantly improve the separation efficiency, achieve efficient separation of ammonium chloride, reduce energy consumption, and lower processing costs. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the embodiments shown in the accompanying drawings, but this does not constitute any limitation on the present invention.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a top view of the separation tank of this utility model.

[0018] Figure 3 This is a utility model Figure 1 A partial structural diagram at point A.

[0019] Figure 4 This is a utility model Figure 1 A schematic diagram of the partial structure at point B.

[0020] Figure 5 This is a utility model Figure 1 A schematic diagram of the partial structure at point C.

[0021] In the diagram: 1. Reaction vessel; 2. Feed pipe; 3. Cooling crystallization assembly; 3a. Cooling jacket; 3b. Liquid inlet pipe; 3c. Opening adjustment valve; 4. Variable speed stirring assembly; 4a. Stirring paddle; 4b. Servo motor; 5. Vacuum filtration assembly; 5a. Separation tank; 5b. Support mesh plate; 5c. Vacuum pump assembly; 6. Valve; 7. Discharge pipe; 8. Filter bag; 9. Filter bag replacement assembly; 9a. Mobile crane; 9b. Lifting unit; 9c. Mounting base; 9d. Telescopic push rod; 9e. Hook; 9f. Lifting lug; 9g. Mounting ring; 9h. Clearance notch; 9i. Positioning column; 9j. Arc-shaped pressure block; 10. Mounting bracket; 11. Tilting bracket; 12. First backflushing pipe; 13. Second backflushing pipe. Detailed Implementation

[0022] See Figure 1-5As shown, this utility model discloses an ammonium chloride separation system for mixed salt mother liquor, comprising a reaction tank 1, with a feed pipe 2 connected to an external mother liquor tank at the upper end of the reaction tank 1. The reaction tank 1 is equipped with a cooling crystallization assembly 3, and a variable-speed stirring assembly 4 is installed inside the reaction tank 1. When liquid enters the reaction tank 1, it is slowly stirred by the variable-speed stirring assembly 4. When the cooling crystallization assembly 3 starts working, the variable-speed stirring assembly 4 increases the stirring speed. The mixed salt mother liquor is transported from the mother liquor tank to the reaction tank through the feed pipe, and the variable-speed stirring assembly slowly stirs it to ensure that the mother liquor entering the reaction tank is initially mixed evenly, avoiding local concentrations that are too high or too low.

[0023] Once the mother liquor in the reaction vessel reaches the predetermined level, the feeding is stopped and the cooling crystallization component is started. The variable speed stirring component gradually increases its rotation speed, making the mother liquor more uniformly mixed during the cooling process, promoting the movement and collision of ammonium chloride molecules, and accelerating the formation of crystal nuclei and the growth of crystals.

[0024] A vacuum filter assembly 5 is provided on one side of the reaction vessel 1. A discharge pipe 7 connected to the vacuum filter assembly 5 is provided at the bottom of the reaction vessel 1 via a valve 6. The vacuum filter assembly 5 includes a detachable filter bag 8. A filter bag replacement assembly 9 is provided above the vacuum filter assembly 5. When the temperature of the mother liquor in the reaction vessel drops to the set temperature and the crystallization process is completed, the valve at the bottom of the reaction vessel is opened. The mixture of ammonium chloride crystals and mother liquor is fed into the filter bag in the vacuum filter assembly along the discharge pipe. Under the action of vacuum suction, the mother liquor passes through the filter bag to form filtrate and is discharged to the filtrate recovery tank. The ammonium chloride crystals are trapped and form a filter cake on the filter bag.

[0025] During the experiment, it was found that vacuum filtration can reduce the solid phase moisture content from 10-16% to 5-8% compared to traditional filtration, which is more than 50% lower than traditional filtration methods. This not only significantly improves separation efficiency and achieves efficient separation of ammonium chloride, thus improving the quality of product recovery, but also reduces subsequent drying energy consumption and lowers processing costs.

[0026] In this embodiment, the cooling crystallization assembly 3 includes a cooling jacket 3a disposed on the outer wall of the reaction tank 1. The cooling jacket 3a is connected to an external cooling water circulation system via a liquid inlet pipe 3b, and the liquid inlet pipe 3b is equipped with a corresponding opening regulating valve 3c. The external cooling water circulation system delivers cooling water to the cooling jacket. By adjusting the opening of the opening regulating valve, the flow rate of cooling water entering the jacket is controlled, thereby controlling the cooling rate of the mother liquor in the reaction tank.

[0027] In this embodiment, the variable-speed stirring assembly 4 includes a stirring paddle 4a disposed inside the reaction tank 1, and a servo motor 4b connected to the stirring paddle 4a is disposed at the upper end of the reaction tank 1. Initially, the stirring paddle 4a rotates at 40-60 rpm; when the cooling crystallization assembly 3 starts working, the rotation speed gradually increases to 150-200 rpm. Through multiple experiments, it was found that a stirring paddle rotation speed of 50 rpm ensures uniform mixing of the mother liquor, avoiding excessively high or low local concentrations. During the cooling crystallization process, a stirring paddle rotation speed of 150-200 rpm effectively accelerates the formation of crystal nuclei and crystal growth, improving crystal growth efficiency.

[0028] In this embodiment, preferably, the vacuum filtration assembly 5 includes a separation tank 5a disposed on one side of the reaction vessel 1, and the filter bag 8 is detachably disposed at the opening end of the separation tank 5a. A support mesh plate 5b is provided inside the separation tank 5a; a vacuum pump assembly 5c connected to an external liquid recovery tank is provided at the bottom of the separation tank 5a. The support mesh plate supports the filter bag, preventing it from slipping and falling into the separation tank after a large amount of crystals accumulate on it.

[0029] The vacuum pump assembly includes pipes and a vacuum pump. Its specific structure and connection method are common knowledge to those skilled in the art and will not be described in detail here. After the filter bag is fitted onto the opening end of the separation tank, the separation tank at the bottom of the filter bag forms a relatively sealed chamber. When the vacuum pump is started, a stable vacuum environment can be created to draw the mother liquor to the bottom of the filter bag.

[0030] Preferably, the filter bag replacement assembly 9 includes a mobile trolley 9a positioned above the separation tank 5a, a lifting unit 9b at the bottom of the mobile trolley 9a, and a mounting base 9c on the lifting unit 9b; the mounting base 9c has a plurality of telescopic push rods 9d evenly distributed circumferentially, and hooks 9e are provided at the ends of the telescopic push rods 9d; the opening end of the filter bag 8 is provided with lifting lugs 9f corresponding to the hooks 9e one by one. The telescopic push rods can be conventional structures such as electric push rods or pneumatic push rods. When it is necessary to remove the filter bag, the position of the hooks is adjusted by the lifting unit and the telescopic push rods to cooperate with the lifting lugs to remove the filter bag.

[0031] An installation ring 9g is provided on the outer wall of the opening end of the separation tank 5a. The installation ring 9g has a clearance notch 9h corresponding to the hook 9e. Positioning posts 9i that cooperate with the lifting lug 9f are provided on the installation rings 9g on both sides of the clearance notch 9h. An arc-shaped pressure block 9j that cooperates with the center of the filter bag 8 is provided at the bottom of the mounting base 9c. The lifting lug is made of the same material as the filter bag and has a certain degree of flexibility. When the filter bag is fitted, the telescopic push rod straightens the lifting lug, and the arc-shaped pressure block positions the center of the filter bag to tighten it, preventing the filter bag from shaking during descent and affecting the fitting process.

[0032] Meanwhile, when removing the filter bag containing crystals, the arc-shaped pressure block can squeeze the crystals on the filter bag, forcing the remaining liquid through the filter bag and further improving the separation effect.

[0033] More preferably, the discharge pipe 7 is a flexible hose, and a mounting bracket 10 is provided on one side of the reaction tank 1. The discharge pipe 7 is fixed on the mounting bracket 10. A flipping bracket 11 is provided at the end of the mounting bracket 10 near the separation tank 5a, which cooperates with the outlet end of the discharge pipe 7. In the initial state, the outlet end of the discharge pipe 7 is located above the separation tank 5a. When the filter bag is replaced, the flipping bracket 11 flips the outlet end of the discharge pipe 7 to the outside of the separation tank 5a. The use of a flipping bracket in conjunction with the flexible hose facilitates repositioning when replacing the filter bag and avoids interference. At the same time, the support of the discharge pipe by the mounting bracket facilitates the standardized installation of the flexible hose pipeline, resulting in a neat and aesthetically pleasing appearance.

[0034] In this embodiment, a plurality of first backflushing pipes 12 are evenly distributed circumferentially at the bottom of the reaction vessel 1, with the front ends of the first backflushing pipes 12 inclined downwards. During the operation of the device, backflushing is performed periodically through the first backflushing pipes to flush the bottom of the reaction vessel and prevent crystal deposition.

[0035] In this embodiment, a second backflushing pipe 13 is provided near the bottom of the discharge pipe 7, with the front end of the second backflushing pipe 13 facing the valve 6. When crystals deposit inside the valve and cause blockage, the second backflushing pipe is activated, and high-pressure water is used to flush the blockage, which can quickly resolve the sudden blockage.

[0036] During operation, the mixed salt mother liquor is transported from the mother liquor tank to the reaction tank through the feed pipe, and the agitator is slowly stirred at a speed of 50 rpm. When the mother liquor in the reaction tank reaches the predetermined level, the feeding is stopped and the external cooling water circulation system is activated to send cooling water into the cooling jacket. At the same time, the servo motor gradually increases the speed of the agitator to 150-200 rpm.

[0037] When the temperature of the mother liquor in the reaction tank drops to the set temperature and the crystallization process is complete, the valve at the bottom of the reaction tank is opened, and the mixture of ammonium chloride crystals and mother liquor is fed into the filter bag in the separation tank through the discharge pipe. The vacuum pump assembly at the bottom of the separation tank is then started for separation. When a certain amount of crystals are collected on the filter bag, the filter bag replacement assembly removes the filter bag containing the crystals and replaces it with a new filter bag.

[0038] The above-described embodiments are preferred embodiments of the present utility model and are only used to facilitate the illustration of the present utility model. They are not intended to limit the present utility model in any way. Any person skilled in the art who makes partial modifications or alterations to the technical content disclosed in the present utility model without departing from the scope of the technical features of the present utility model shall still fall within the scope of the technical features of the present utility model.

Claims

1. An ammonium chloride separation system for mixed salt mother liquor, comprising a reaction vessel (1), characterized in that, The upper end of the reaction tank (1) is connected to a feed pipe (2) that is connected to an external mother liquor tank. The reaction tank (1) is equipped with a cooling crystallization assembly (3) and a variable speed stirring assembly (4) is provided inside the reaction tank (1). When the liquid enters the reaction tank (1), it is slowly stirred by the variable speed stirring assembly (4). When the cooling crystallization assembly (3) starts to work, the variable speed stirring assembly (4) increases the stirring speed. A vacuum filter assembly (5) is provided on one side of the reaction vessel (1). A discharge pipe (7) connected to the vacuum filter assembly (5) is provided at the bottom of the reaction vessel (1) via a valve (6). The vacuum filter assembly (5) includes a detachable filter bag (8). A filter bag replacement assembly (9) is provided above the vacuum filter assembly (5).

2. The ammonium chloride separation system for mixed salt mother liquor according to claim 1, characterized in that, The cooling crystallization assembly (3) includes a cooling jacket (3a) installed on the outer wall of the reaction vessel (1). The cooling jacket (3a) is connected to an external cooling water circulation system through a liquid inlet pipe (3b). The liquid inlet pipe (3b) is equipped with a corresponding opening adjustment valve (3c).

3. The ammonium chloride separation system for mixed salt mother liquor according to claim 1, characterized in that, The variable speed stirring assembly (4) includes a stirring paddle (4a) installed in the reaction tank (1), and a servo motor (4b) connected to the stirring paddle (4a) is provided at the upper end of the reaction tank (1); in the initial state, the stirring paddle (4a) rotates at 40-60 rpm; when the cooling crystallization assembly (3) starts to work, the rotation speed gradually increases to 150-200 rpm.

4. The ammonium chloride separation system for mixed salt mother liquor according to claim 1, characterized in that, The vacuum filtration assembly (5) includes a separation tank (5a) disposed on one side of the reaction vessel (1), a filter bag (8) is detachably disposed at the opening end of the separation tank (5a), a support mesh plate (5b) is provided in the separation tank (5a), and a vacuum pump assembly (5c) connected to an external liquid recovery tank is provided at the bottom of the separation tank (5a).

5. The ammonium chloride separation system for mixed salt mother liquor according to claim 4, characterized in that, The filter bag replacement assembly (9) includes a mobile trolley (9a) positioned above the separation tank (5a), a lifting unit (9b) at the bottom of the mobile trolley (9a), and a mounting base (9c) on the lifting unit (9b); the mounting base (9c) is provided with a plurality of telescopic push rods (9d) evenly distributed around the circumference, and the ends of the telescopic push rods (9d) are provided with hooks (9e); the opening end of the filter bag (8) is provided with a lifting lug (9f) corresponding to the hooks (9e) one by one; An installation ring (9g) is provided on the outer wall of the opening end of the separation tank (5a). A clearance notch (9h) corresponding to the hook (9e) is provided on the installation ring (9g). A positioning post (9i) cooperating with the lifting lug (9f) is provided on the installation ring (9g) on ​​both sides of the clearance notch (9h). An arc-shaped pressure block (9j) cooperating with the center of the filter bag (8) is provided at the bottom of the installation seat (9c).

6. The ammonium chloride separation system for mixed salt mother liquor according to claim 4, characterized in that, The discharge pipe (7) is a flexible hose. An installation bracket (10) is provided on one side of the reaction tank (1). The discharge pipe (7) is fixed on the installation bracket (10). A flip bracket (11) is provided at the end of the installation bracket (10) near the separation tank (5a) to cooperate with the outlet end of the discharge pipe (7). In the initial state, the outlet end of the discharge pipe (7) is located above the separation tank (5a). When the filter bag is replaced, the flip bracket (11) flips the outlet end of the discharge pipe (7) to the outside of the separation tank (5a).

7. The ammonium chloride separation system for mixed salt mother liquor according to claim 1, characterized in that, The bottom of the reaction vessel (1) is evenly distributed with several first backflushing pipes (12) along the circumference, and the front end of the first backflushing pipes (12) is inclined downward.

8. The ammonium chloride separation system for mixed salt mother liquor according to claim 1, characterized in that, The discharge pipe (7) is provided with a second backflushing pipe (13) near the bottom of the reaction tank (1), and the front end of the second backflushing pipe (13) faces the valve (6).

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