Cooling crystallization equipment for recovering ammonium chloride from food-grade baking soda mother liquor

Abstract

The invention discloses cooling crystallization equipment for recovering ammonium chloride from food-grade baking soda mother liquor, and relates to the technical field of ammonium chloride recovery, the cooling crystallization equipment comprises a cooling shell and a crystallization shell arranged under the cooling shell, and a connecting frame is fixedly connected between the cooling shell and the crystallization shell; an air cooling mechanism is installed at the top of the cooling shell, a circulating mechanism is fixedly connected between the outer side face of the cooling shell and the bottom of the crystallization shell, and the spraying mechanism is installed in the cooling shell and is sequentially provided with a liquid blocking mechanism, a spraying mechanism body and a liquid separation mechanism from top to bottom; and a material guide crystallization mechanism is mounted at the bottom of the inner cavity of the crystallization shell. According to the cooling crystallization equipment for recovering ammonium chloride from the food-grade baking soda mother liquor, liquid in the cooling shell is subjected to air cooling through the air cooling mechanism, the cooling process is assisted, the liquid is dispersed more uniformly through the spraying mechanism and the liquid separation mechanism, the contact area with air is increased, and the cooling crystallization efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ammonium chloride recovery, in particular to cooling crystallization equipment for recovering ammonium chloride from food-grade baking soda mother liquor. Background Art

[0002] In the production process of food-grade baking soda, a large amount of mother liquor containing ammonium chloride is produced. As an important chemical raw material, ammonium chloride has a wide range of uses, such as nitrogen fertilizer in the agricultural field and can be used to manufacture dry batteries in the battery industry. If these mother liquors containing ammonium chloride are directly discharged, it will not only cause a waste of resources, but also pollute the environment; Traditional ammonium chloride recovery methods have many drawbacks. For example, some simple evaporation and crystallization methods have extremely high energy consumption and high costs, and are prone to decomposition of ammonium chloride during the evaporation process, reducing product quality. Although the chemical precipitation method can remove some impurities, the recovery rate is low, and new chemicals will be introduced, affecting the purity of ammonium chloride, making it difficult to meet food-grade requirements. Therefore, cooling crystallization technology has become an important means of recovering ammonium chloride; Traditional cooling crystallization usually adopts natural cooling crystallization device or jacket cooling crystallizer. The cooling speed of natural cooling crystallization device is extremely slow, the production cycle is too long and the floor space is large. Operators need to intervene frequently and the labor intensity is extremely high. It cannot adapt to the large-scale production needs of recovering ammonium chloride from food-grade baking soda mother liquor. The jacket cooling crystallizer uses a method of sending cooling water into the jacket and realizing solution cooling crystallization through interwall heat exchange. This method will cause a large amount of cooling water waste and it is difficult to improve production efficiency. Summary of the invention

[0003] To achieve the above purpose, the present invention is implemented by the following technical scheme: a cooling crystallization device for recovering ammonium chloride from food-grade baking soda mother liquor, comprising: A cooling shell, and a crystallization shell arranged directly below the cooling shell, a connecting frame is fixedly connected between the cooling shell and the crystallization shell, an air cooling mechanism is installed on the top of the cooling shell, and the air cooling mechanism cools the liquid in the cooling shell to assist the cooling process, a circulation mechanism is fixedly connected between the outer side of the cooling shell and the bottom of the crystallization shell, and the circulation mechanism realizes the circulation crystallization of the mother liquid to prevent insufficient crystallization, a feeding hopper is fixedly installed on the outer side of the crystallization shell, and a supporting frame is fixedly installed on the bottom of the outer side of the crystallization shell; A spraying mechanism is installed inside the cooling shell. The spraying mechanism is connected to the circulation mechanism. The spraying mechanism disperses the liquid more evenly, increases the contact area with the air, and improves the cooling efficiency. A liquid separation mechanism is arranged directly below the spraying mechanism. The liquid separation mechanism is fixedly installed on the inner wall of the cooling shell. The liquid separation mechanism further separates the liquid from top to bottom to make the liquid distribution more even, which is conducive to cooling and crystallization.

[0004] A liquid blocking mechanism, which is installed inside the cooling shell and is arranged just above the spraying mechanism, and can block the splashing of liquid; A material guiding crystallization mechanism, which is installed at the bottom of the inner cavity of the crystallization shell and can push the crystallized ammonium chloride to move toward the center for easy collection; Wherein, the spraying mechanism includes a liquid through pipe and a cone ring, one end of the liquid through pipe passes through the cooling shell and extends to the outside thereof, a liquid outlet pipe is fixedly installed at the bottom of the liquid through pipe, a liquid separation cover is fixedly installed at the bottom of the liquid outlet pipe, a liquid leakage hole is provided at the bottom of the liquid separation cover, a rotating ring is fixedly installed at the inner wall of the liquid outlet pipe, a rotating groove is provided at the top of the outer side surface of the cone ring, the rotating groove is rotatably installed on the outer surface of the rotating ring, a spiral groove 1 is provided on the inner side surface of the cone ring, and a liquid outlet groove is provided on the outer side surface of the cone ring, and the liquid outlet groove is arranged inside the spiral groove 1.

[0005] Preferably, the bottoms of the cooling shell and the crystallization shell are both inverted cones, and a through hole is provided in the middle of the bottom of the cooling shell. The top of the crystallization shell is matched with the bottom of the cooling shell, and a feed port is provided in the middle of the top of the crystallization shell. The inverted cone design facilitates the collection and diversion of liquid, thereby improving the operating efficiency of the equipment.

[0006] Preferably, a liquid guiding groove is provided at the bottom of the inner cavity of the cooling shell, which can better guide the flow of liquid. A sight glass is fixedly installed on the outer side of the cooling shell, which facilitates observation of the internal liquid state.

[0007] Preferably, the interior of the cooling shell is connected to the outside air through a connecting frame, a filter is installed on the outer side of the cooling shell, the connecting frame connects the cooling shell and the crystallization shell to ensure a firm connection between the two, and the filter can prevent external impurities from entering with the air.

[0008] Preferably, the air cooling mechanism includes a wind tube and a motor, the wind tube is fixedly installed in the middle of the top of the cooling shell, an air outlet is opened at the top of the wind tube, the motor is fixedly installed in the middle of the top of the wind tube through a bracket, the output end of the motor is fixedly connected with a transmission shaft, the transmission shaft passes through the wind tube and extends to the inside thereof, a fan is fixedly installed on the outer surface of the transmission shaft, the motor drives the transmission shaft and the fan to rotate, outside air enters the through hole at the bottom of the cooling shell from the connecting frame, flows through the inside of the cooling shell from bottom to top, and then blows out from the air outlet, this operation performs air cooling on the liquid in the cooling shell, thereby assisting the cooling process.

[0009] Preferably, the circulation mechanism includes a mounting plate, which is fixedly mounted on the outer side of the cooling shell, and a circulation pump is fixedly mounted on the top of the mounting plate, and the input end and the output end of the circulation pump are respectively fixedly connected with infusion tube 1 and infusion tube 2, the other end of the infusion tube 1 is fixedly connected to the middle of the bottom of the crystallization shell, and a discharge valve is fixedly mounted at the bend of the infusion tube 1 near the bottom of the crystallization shell, and the other end of the infusion tube 2 is fixedly connected to the end of the liquid passage pipe, and liquid is extracted from the bottom of the crystallization shell through the infusion tube 1 and then transported to the liquid passage pipe of the spraying mechanism through the infusion tube 2 to realize liquid circulation, and the discharge valve can control the discharge of crystallized ammonium chloride.

[0010] Preferably, the liquid baffle mechanism includes a liquid baffle plate, which is fixedly installed on the inner wall of the cooling shell, and the lower surface of the liquid baffle plate is a concave arc surface. The arc surface design of the liquid baffle plate can prevent liquid from splashing. A liquid guide part is fixedly installed on the surface of the liquid baffle plate, and the liquid guide part is evenly distributed on the surface of the liquid baffle plate. The liquid guide part redirects the liquid to flow downward.

[0011] Preferably, the liquid guiding component includes a liquid blocking cover, which is fixedly installed on the surface of the liquid blocking plate. The liquid blocking cover is arranged through the surface of the liquid blocking plate, and a limited liquid groove is opened at the bottom of the inner wall of the liquid blocking cover, and the depth of the limited liquid groove gradually becomes shallower from bottom to top along the inner wall of the liquid blocking cover, and a flow blocking plate is fixedly installed on the top of the limited liquid groove. When the liquid enters the liquid blocking cover, the liquid limiting groove guides the liquid to flow to the flow blocking plate, and the flow blocking plate further blocks the liquid, so that the liquid flows downward in an orderly manner.

[0012] Preferably, the liquid separation mechanism includes a mounting ring, which is fixedly installed on the inner wall of the cooling shell, and the inner side surface of the mounting ring is fixedly installed with a conical liquid separation plate 1, an inverted conical liquid separation plate and a conical liquid separation plate 2 in sequence from top to bottom. The surfaces of the conical liquid separation plate 1, the inverted conical liquid separation plate and the conical liquid separation plate 2 are all provided with liquid separation holes. Through the layer-by-layer liquid separation of the conical liquid separation plate 1, the inverted conical liquid separation plate and the conical liquid separation plate 2, the liquid distribution is more even, which is conducive to cooling and crystallization.

[0013] Preferably, the material guiding crystallization mechanism includes a mounting frame, which is fixedly mounted on the bottom of the inner cavity of the crystallization shell, and a fixed shaft is fixedly connected to the center of the top of the mounting frame. A rotating sleeve is rotatably mounted on the outer surface of the fixed shaft, and a spiral blade is fixedly mounted on the outer surface of the rotating sleeve. A spiral groove 2 is opened on the upper surface of the spiral blade. When the fully cooled mother liquor flows into the spiral groove 2 of the spiral blade, the spiral blade rotates to stir the mother liquor in the crystallization shell, and at the same time pushes the crystallized ammonium chloride to move toward the center for easy collection.

[0014] The present invention provides a cooling crystallization device for recovering ammonium chloride from food-grade baking soda mother liquor. It has the following beneficial effects: 1. The cooling crystallization equipment for recovering ammonium chloride from food-grade baking soda mother liquor has an air cooling mechanism. The motor drives the transmission shaft and the fan to rotate. The outside air enters the through hole at the bottom of the cooling shell from the connecting frame, flows through the inside of the cooling shell from bottom to top, and then blows out from the air outlet. The wind cools the mist mother liquor sprayed by the spraying mechanism in the cooling shell, speeds up the cooling speed of the mother liquor, and enables the ammonium chloride to reach a supersaturated state faster and then crystallize out, which greatly shortens the cooling crystallization cycle and improves production efficiency.

[0015] Second, the cooling crystallization equipment for recovering ammonium chloride from the mother liquor of food-grade baking soda has a circulation mechanism, and liquid is extracted from the bottom of the crystallization shell through the first infusion pipe, and then transported to the liquid pipe of the spraying mechanism through the second infusion pipe to realize liquid circulation. The discharge valve can control the discharge of the crystallized ammonium chloride, and the mother liquor in the crystallization shell is continuously sent to the cooling shell for cooling and then refluxed, so that the mother liquor is repeatedly cooled, the cooling effect is improved, the temperature of the mother liquor is ensured to drop evenly, the ammonium chloride crystallization is more sufficient, the recovery rate of ammonium chloride is improved, and the stability of the crystallization process is ensured.

[0016] 3. The cooling crystallization equipment for recovering ammonium chloride from food-grade baking soda mother liquor has a spraying mechanism. The mother liquor sent by the circulation mechanism enters the liquid pipe and then flows into the liquid outlet pipe. In the liquid outlet pipe, the liquid impacts the cone ring to make it rotate around the rotating ring. The liquid flows along the spiral groove on the inner side of the cone ring, then flows out from the liquid outlet groove into the liquid separation hood, and finally sprays out from the leakage hole in the form of mist. When working, the mother liquor is dispersed into small droplets, which greatly increases the contact area between the mother liquor and the air, accelerates the cooling speed of the mother liquor, and makes the mother liquor cooled more evenly at the same time, avoiding uneven crystallization caused by local temperature differences, and improving the quality of ammonium chloride crystals.

[0017] 4. The cooling crystallization equipment for recovering ammonium chloride from food-grade baking soda mother liquor has a liquid blocking mechanism. When the droplets sprayed by the spraying mechanism splash upward, the upper concave arc surface of the liquid blocking plate blocks the droplets. When the liquid enters the liquid blocking cover, the liquid limiting groove guides the liquid to flow to the baffle plate. The baffle plate further blocks the liquid, allowing the liquid to flow downward in an orderly manner. The liquid blocking mechanism effectively blocks and guides the splashing droplets, preventing the splashing of droplets from causing material loss and equipment pollution, and ensuring that the cooling crystallization process is carried out in an orderly manner inside the equipment.

[0018] 5. The cooling crystallization equipment for recovering ammonium chloride from food-grade baking soda mother liquor has a material guiding crystallization mechanism. When the fully cooled mother liquor flows into the spiral groove 2 of the spiral blade, the spiral blade rotates to stir the mother liquor in the crystallization shell and push the crystallized ammonium chloride to move toward the center for easy collection. The material guiding crystallization mechanism improves the discharging efficiency of ammonium chloride and reduces the manual collection cost. At the same time, it can stir the uncrystallized mother liquor in the crystallization shell to improve the crystallization efficiency of the mother liquor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the appearance of the present invention; Figure 3 It is a cross-sectional view of the present invention; Figure 4 It is a partial cross-sectional view of the housing of the present invention; Figure 5 This is a schematic diagram of the structure of the air cooling mechanism of the present invention; Figure 6 It is a schematic diagram of the structure of the circulation mechanism of the present invention; Figure 7 It is a schematic diagram of the structure of the liquid blocking mechanism of the present invention; Figure 8 It is a schematic diagram of the structure of the liquid guide member of the present invention; Fig. 9 It is a partial cross-sectional view of the spraying mechanism of the present invention; Fig.10 It is an enlarged schematic diagram of part A of the present invention; Fig.11 It is a schematic diagram of the structure of the material guiding crystallization mechanism of the present invention.

[0020] In the figure: 1, cooling shell; 2, crystallization shell; 3, air cooling mechanism; 31, air cylinder; 32, air outlet; 33, motor; 34, transmission shaft; 35, fan; 4, circulation mechanism; 41, mounting plate; 42, circulation pump; 43, infusion tube 1; 44, infusion tube 2; 45, discharge valve; 5, liquid blocking mechanism; 51, liquid blocking plate; 52, liquid guide; 521, liquid blocking cover; 522, liquid limiting tank; 523, flow blocking plate; 6, spraying mechanism; 61, liquid pipe; 62, liquid outlet pipe; 63, liquid separation Cover; 64, leakage hole; 65, rotating ring; 66, cone ring; 67, rotating groove; 68, spiral groove one; 69, liquid outlet groove; 7, liquid separation mechanism; 71, conical liquid separation plate one; 72, inverted conical liquid separation plate; 73, conical liquid separation plate two; 74, liquid separation hole; 75, mounting ring; 8, material guide crystallization mechanism; 81, mounting frame; 82, fixed shaft; 83, rotating sleeve; 84, spiral blade; 85, spiral groove two; 9, connecting frame; 10, endoscope; 11, liquid guide groove; 12, support frame; 13, feed hopper. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The first embodiment, as Figures 1 to 6 As shown, the present invention provides a technical solution: a cooling crystallization device for recovering ammonium chloride from a food-grade baking soda mother liquor, comprising a cooling shell 1, and a crystallization shell 2 arranged directly below the cooling shell 1, a connecting frame 9 is fixedly connected between the cooling shell 1 and the crystallization shell 2, an air cooling mechanism 3 is installed on the top of the cooling shell 1, the air cooling mechanism 3 performs air cooling and cooling on the liquid in the cooling shell 1 to assist the cooling process, a circulation mechanism 4 is fixedly connected between the outer side of the cooling shell 1 and the bottom of the crystallization shell 2, the circulation mechanism 4 realizes the circulation crystallization of the mother liquor to prevent insufficient crystallization, a feeding hopper 13 is fixedly installed on the outer side of the crystallization shell 2, and a support frame 12 is fixedly installed on the bottom of the outer side of the crystallization shell 2; The bottoms of the cooling shell 1 and the crystallization shell 2 are both inverted cones, and a through hole is provided in the middle of the bottom of the cooling shell 1. The top of the crystallization shell 2 is matched with the bottom of the cooling shell 1, and a feed port is provided in the middle of the top of the crystallization shell 2. The inverted cone design facilitates the collection and diversion of liquids, thereby improving the operating efficiency of the equipment. A liquid guiding groove 11 is provided at the bottom of the inner cavity of the cooling shell 1, and the liquid guiding groove 11 can better guide the flow of the liquid. A sight glass 10 is fixedly installed on the outer side of the cooling shell 1, and the sight glass 10 is convenient for observing the internal liquid state. The interior of the cooling shell 1 is connected to the outside air through the connecting frame 9. A filter is installed on the outer side of the cooling shell 1. The connecting frame 9 connects the cooling shell 1 and the crystallization shell 2 to ensure that the two are firmly connected. The filter can prevent external impurities from entering with the air. The air cooling mechanism 3 includes an air cylinder 31 and a motor 33. The air cylinder 31 is fixedly installed in the middle of the top of the cooling shell 1. An air outlet 32 ​​is opened at the top of the air cylinder 31. The motor 33 is fixedly installed in the middle of the top of the air cylinder 31 through a bracket. The output end of the motor 33 is fixedly connected with a transmission shaft 34. The transmission shaft 34 passes through the air cylinder 31 and extends to the inside thereof. A fan 35 is fixedly installed on the outer surface of the transmission shaft 34. The motor 33 drives the transmission shaft 34 and the fan 35 to rotate. External air enters the through hole at the bottom of the cooling shell 1 from the connecting frame 9, flows through the inside of the cooling shell 1 from bottom to top, and then blows out from the air outlet 32. This operation cools the liquid in the cooling shell 1 with air, thereby assisting the cooling process. The circulation mechanism 4 includes a mounting plate 41, which is fixedly mounted on the outer side of the cooling shell 1. A circulation pump 42 is fixedly mounted on the top of the mounting plate 41. The input end and the output end of the circulation pump 42 are respectively fixedly connected with a liquid infusion tube 1 43 and a liquid infusion tube 2 44. The other end of the liquid infusion tube 1 43 is fixedly connected to the middle of the bottom of the crystallization shell 2. A discharge valve 45 is fixedly mounted at the bend of the liquid infusion tube 1 43 near the bottom of the crystallization shell 2. The other end of the liquid infusion tube 2 44 is fixedly connected to the end of the liquid through pipe 61. Liquid is extracted from the bottom of the crystallization shell 2 through the liquid infusion tube 1 43 and then transported to the liquid through pipe 61 of the spraying mechanism 6 through the liquid infusion tube 2 44 to realize liquid circulation. The discharge valve 45 can control the discharge of crystallized ammonium chloride.

[0023] The second embodiment is based on the first embodiment. Figures 1 to 10 As shown, the spraying mechanism 6 is installed inside the cooling shell 1, and the spraying mechanism 6 is connected with the circulation mechanism 4. The spraying mechanism 6 makes the liquid dispersed more evenly, increases the contact area with the air, and improves the cooling efficiency. A liquid separation mechanism 7 is arranged directly below the spraying mechanism 6. The liquid separation mechanism 7 is fixedly installed on the inner wall of the cooling shell 1. The liquid separation mechanism 7 further separates the liquid from top to bottom, so that the liquid is distributed more evenly, which is conducive to cooling and crystallization. The spraying mechanism 6 includes a liquid through pipe 61 and a cone ring 66. One end of the liquid through pipe 61 passes through the cooling shell 1 and extends to the outside thereof. A liquid outlet pipe 62 is fixedly installed at the bottom of the liquid through pipe 61. A liquid separation cover 63 is fixedly installed at the bottom of the liquid outlet pipe 62. A leakage hole 64 is provided at the bottom of the liquid separation cover 63. A swivel 65 is fixedly installed on the inner wall of the liquid outlet pipe 62. A swivel groove 67 is provided at the top of the outer side surface of the cone ring 66. The swivel groove 67 is rotatably installed on the outer surface of the swivel 65. A spiral groove 68 is provided on the inner side surface of the cone ring 66. A liquid outlet groove 69 is provided on the outer side surface of the cone ring 66. The liquid outlet groove 69 is arranged inside the spiral groove 68.

[0024] The liquid blocking mechanism 5 is installed inside the cooling housing 1 and is arranged just above the spraying mechanism 6. The liquid blocking mechanism 5 can block the splashing of the liquid. The liquid blocking mechanism 5 includes a liquid blocking plate 51, which is fixedly mounted on the inner wall of the cooling housing 1. The lower surface of the liquid blocking plate 51 is an upwardly concave arc surface. The arc surface design of the liquid blocking plate 51 can prevent liquid splashing. A liquid guiding member 52 is fixedly mounted on the surface of the liquid blocking plate 51. The liquid guiding member 52 is evenly distributed on the surface of the liquid blocking plate 51. The liquid guiding member 52 redirects the liquid to flow downward. The liquid guide member 52 includes a liquid blocking cover 521, which is fixedly mounted on the surface of the liquid blocking plate 51. The liquid blocking cover 521 is arranged on the surface of the liquid blocking plate 51, and a limited liquid groove 522 is provided at the bottom of the inner wall of the liquid blocking cover 521. The depth of the limited liquid groove 522 gradually decreases from bottom to top along the inner wall of the liquid blocking cover 521. A flow blocking piece 523 is fixedly mounted on the top of the limited liquid groove 522. When the liquid enters the liquid blocking cover 521, the limited liquid groove 522 guides the liquid to flow to the flow blocking piece 523, and the flow blocking piece 523 further blocks the liquid, so that the liquid flows downward in an orderly manner. The liquid separation mechanism 7 includes a mounting ring 75, which is fixedly mounted on the inner wall of the cooling shell 1. A conical liquid separation plate 71, an inverted conical liquid separation plate 72 and a conical liquid separation plate 73 are fixedly mounted on the inner side of the mounting ring 75 in sequence from top to bottom. Liquid separation holes 74 are provided on the surfaces of the conical liquid separation plate 71, the inverted conical liquid separation plate 72 and the conical liquid separation plate 73. Liquid is separated layer by layer through the conical liquid separation plate 71, the inverted conical liquid separation plate 72 and the conical liquid separation plate 73, so that the liquid is distributed more evenly, which is beneficial to cooling and crystallization.

[0025] The third embodiment is based on the first and second embodiments. Figures 1 to 11 As shown, the material guiding crystallization mechanism 8 is installed at the bottom of the inner cavity of the crystallization shell 2, and the material guiding crystallization mechanism 8 is convenient for collecting the crystallized ammonium chloride; The material guiding crystallization mechanism 8 includes a mounting frame 81, which is fixedly mounted on the bottom of the inner cavity of the crystallization shell 2. A fixed shaft 82 is fixedly connected to the center of the top of the mounting frame 81. A rotating sleeve 83 is rotatably mounted on the outer surface of the fixed shaft 82. A spiral blade 84 is fixedly mounted on the outer surface of the rotating sleeve 83. A spiral groove 85 is provided on the upper surface of the spiral blade 84. When the fully cooled mother liquor flows into the spiral groove 85 of the spiral blade 84, the spiral blade 84 rotates to stir the mother liquor in the crystallization shell 2 and push the crystallized ammonium chloride to move toward the center for easy collection.

[0026] When in use, the operator injects the food-grade baking soda mother liquid into the crystallization shell 2 through the feed hopper 13. At this time, the discharge valve 45 is in a closed state to ensure that the mother liquid does not flow out in advance. The circulation pump 42 is started, and the mother liquid is extracted from the bottom of the crystallization shell 2 through the infusion pipe 1 43, and then transported to the liquid pipe 61 of the spraying mechanism 6 in the cooling shell 1 through the infusion pipe 2 44; The liquid in the liquid pipe 61 flows into the liquid outlet pipe 62, and in the liquid outlet pipe 62, the liquid impacts the cone ring 66 to make it rotate around the rotating ring 65. The liquid flows along the spiral groove 68 on the inner side of the cone ring 66, then flows out from the liquid outlet groove 69 into the liquid separation cover 63, and finally sprays out from the leakage hole 64 in the form of mist. At the same time, the motor 33 is started, and the motor 33 drives the transmission shaft 34 and the fan 35 to rotate. The outside air enters the through hole at the bottom of the cooling shell 1 from the connecting frame 9, flows through the inside of the cooling shell 1 from bottom to top, and then blows out from the air outlet 32 ​​to cool the sprayed mist mother liquid.

[0027] The cooled liquid flows downward, and the concave arc surface on the liquid baffle plate 51 of the liquid baffle mechanism 5 blocks the liquid from splashing. When the liquid enters the liquid baffle cover 521, the liquid limiting groove 522 guides the liquid to flow to the baffle plate 523. The baffle plate 523 further blocks the liquid, so that the liquid flows downward again. The liquid flows through the liquid separation mechanism 7, and passes through the conical liquid separation plate 1 71, the inverted conical liquid separation plate 72 and the conical liquid separation plate 2 73 in sequence. The liquid separation holes 74 on the surfaces of these liquid separation plates perform secondary liquid separation on the liquid, so that the liquid falls more evenly downward to the bottom of the cooling shell 1. The liquid at the bottom of the cooling shell 1 flows into the crystallization shell 2 through the liquid guide groove 11 and the through hole in the middle of the bottom. In this way, the temperature of the mother liquid is continuously reduced. When the mother liquid flows into the spiral groove 2 85 of the spiral blade 84, the spiral blade 84 rotates to stir the mother liquid in the crystallization shell 2 and push the crystallized ammonium chloride to move to the center for easy collection. During the continuous cooling cycle, the temperature of the mother liquor continues to decrease, and ammonium chloride gradually crystallizes and precipitates. When the crystallization is completed, the discharge valve 45 is opened, and the crystallized ammonium chloride is discharged from the bend at the bottom of the infusion tube 43.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cooling crystallization device for recovering ammonium chloride from food-grade baking soda mother liquor, characterized in that: include: A cooling shell (1), and a crystallization shell (2) arranged directly below the cooling shell (1), a connecting frame (9) being fixedly connected between the cooling shell (1) and the crystallization shell (2), an air cooling mechanism (3) being installed on the top of the cooling shell (1), a circulation mechanism (4) being fixedly connected between the outer side surface of the cooling shell (1) and the bottom of the crystallization shell (2), a feeding hopper (13) being fixedly installed on the outer side surface of the crystallization shell (2), and a supporting frame (12) being fixedly installed on the bottom of the outer side surface of the crystallization shell (2); A spraying mechanism (6), the spraying mechanism (6) being installed inside the cooling shell (1), the spraying mechanism (6) being connected to the circulation mechanism (4), a liquid separation mechanism (7) being arranged directly below the spraying mechanism (6), the liquid separation mechanism (7) being fixedly installed on the inner wall of the cooling shell (1); A liquid blocking mechanism (5), the liquid blocking mechanism (5) being installed inside the cooling shell (1), and the liquid blocking mechanism (5) being arranged directly above the spraying mechanism (6); A material guiding crystallization mechanism (8), wherein the material guiding crystallization mechanism (8) is installed at the bottom of the inner cavity of the crystallization shell (2); The spraying mechanism (6) comprises a liquid passage pipe (61) and a cone ring (66), one end of the liquid passage pipe (61) passes through the cooling shell (1) and extends to the outside thereof, a liquid outlet pipe (62) is fixedly mounted at the bottom of the liquid passage pipe (61), a liquid separation cover (63) is fixedly mounted at the bottom of the liquid outlet pipe (62), a liquid leakage hole (64) is provided at the bottom of the liquid separation cover (63), a rotating ring (65) is fixedly mounted on the inner wall of the liquid outlet pipe (62), a rotating groove (67) is provided at the top of the outer side surface of the cone ring (66), the rotating groove (67) is rotatably mounted on the outer surface of the rotating ring (65), a spiral groove 1 (68) is provided on the inner side surface of the cone ring (66), and a liquid outlet groove (69) is provided on the outer side surface of the cone ring (66), and the liquid outlet groove (69) is arranged inside the spiral groove 1 (68).

2. A cooling crystallization device for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 1, characterized in that: The bottoms of the cooling shell (1) and the crystallization shell (2) are both in the shape of an inverted cone, and a through hole is provided in the middle of the bottom of the cooling shell (1); the top of the crystallization shell (2) is adapted to the bottom of the cooling shell (1), and a feed port is provided in the middle of the top of the crystallization shell (2).

3. A cooling crystallization device for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 2, characterized in that: A liquid guide groove (11) is provided at the bottom of the inner cavity of the cooling shell (1), and a sight glass (10) is fixedly mounted on the outer side surface of the cooling shell (1).

4. A cooling crystallization device for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 3, characterized in that: The interior of the cooling shell (1) is connected to the outside air via a connecting frame (9), and a filter is installed on the outer side of the cooling shell (1).

5. The cooling crystallization device for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 1, characterized in that: The air cooling mechanism (3) comprises an air cylinder (31) and a motor (33); the air cylinder (31) is fixedly mounted in the middle of the top of the cooling shell (1); an air outlet (32) is provided at the top of the air cylinder (31); the motor (33) is fixedly mounted in the middle of the top of the air cylinder (31) via a bracket; an output end of the motor (33) is fixedly connected to a transmission shaft (34); the transmission shaft (34) passes through the air cylinder (31) and extends into the interior thereof; a fan (35) is fixedly mounted on the outer surface of the transmission shaft (34).

6. The cooling crystallization equipment for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 1, characterized in that: The circulation mechanism (4) comprises a mounting plate (41), the mounting plate (41) being fixedly mounted on the outer side surface of the cooling shell (1), a circulating pump (42) being fixedly mounted on the top of the mounting plate (41), the input end and the output end of the circulating pump (42) being fixedly connected to a first infusion tube (43) and a second infusion tube (44) respectively, the other end of the first infusion tube (43) being fixedly connected to the middle of the bottom of the crystallization shell (2), a discharge valve (45) being fixedly mounted on the first infusion tube (43) at a bend near the bottom of the crystallization shell (2), and the other end of the second infusion tube (44) being fixedly connected to the end of the liquid passage tube (61).

7. The cooling crystallization equipment for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 1, characterized in that: The liquid baffle mechanism (5) comprises a liquid baffle plate (51), the liquid baffle plate (51) being fixedly mounted on the inner wall of the cooling shell (1), the lower surface of the liquid baffle plate (51) being an upwardly concave arc surface, and a liquid guide member (52) being fixedly mounted on the surface of the liquid baffle plate (51), the liquid guide member (52) being evenly distributed on the surface of the liquid baffle plate (51).

8. The cooling crystallization device for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 7, characterized in that: The liquid guiding member (52) comprises a liquid blocking cover (521), the liquid blocking cover (521) being fixedly mounted on the surface of the liquid blocking plate (51), the liquid blocking cover (521) being arranged through the surface of the liquid blocking plate (51), a limited liquid groove (522) being provided at the bottom of the inner wall of the liquid blocking cover (521), the depth of the limited liquid groove (522) gradually becoming shallower from bottom to top along the inner wall of the liquid blocking cover (521), and a flow blocking plate (523) being fixedly mounted on the top of the limited liquid groove (522).

9. The cooling crystallization device for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 1, characterized in that: The liquid separation mechanism (7) comprises a mounting ring (75), wherein the mounting ring (75) is fixedly mounted on the inner wall of the cooling shell (1), and a conical liquid separation plate (71), an inverted conical liquid separation plate (72) and a conical liquid separation plate (73) are fixedly mounted on the inner side surface of the mounting ring (75) in order from top to bottom, and liquid separation holes (74) are provided on the surfaces of the conical liquid separation plate (71), the inverted conical liquid separation plate (72) and the conical liquid separation plate (73).

10. The cooling crystallization equipment for recovering ammonium chloride from a food-grade baking soda mother liquor according to claim 1, characterized in that: The material guiding crystallization mechanism (8) comprises a mounting frame (81), the mounting frame (81) being fixedly mounted on the bottom of the inner cavity of the crystallization shell (2), a fixed shaft (82) being fixedly connected to the center of the top of the mounting frame (81), a rotating sleeve (83) being rotatably mounted on the outer surface of the fixed shaft (82), a spiral blade (84) being fixedly mounted on the outer surface of the rotating sleeve (83), and a spiral groove (85) being provided on the upper surface of the spiral blade (84).

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