A refrigerated magnesium removal crystallization stirring tank

Abstract

The application relates to a frozen magnesium-removing crystallization stirring barrel. Waste liquid inlets and waste liquid outlets are oppositely arranged on the two sides of the stirring barrel and located on the upper side of the stirring barrel. Refrigerant inlets and refrigerant outlets are arranged on the top of the stirring barrel and are communicated with heat exchange coils arranged in the stirring barrel and refrigerant storage equipment arranged outside the stirring barrel. A motor is horizontally arranged on the top of the stirring barrel. The output end of the motor penetrates through the stirring barrel and extends into the stirring barrel to be connected with a stirring shaft. A plurality of stirring blades are arranged on the stirring shaft. Through heat exchange between the refrigerant medium and the waste electrolyte in the stirring barrel, the temperature of the waste electrolyte can be rapidly reduced, the magnesium impurities in the waste electrolyte can be precipitated in the form of crystals, the magnesium ions and other temperature-sensitive impurities in the waste electrolyte can be effectively removed, high-quality raw materials can be provided for zinc electrolysis, the product quality and production efficiency of the zinc electrolysis can be remarkably improved, new chemical impurities are not introduced, and the pollution to the environment is reduced.

Description

Technical Field

[0001] This application relates to the field of zinc electrolysis production technology, and in particular to a frozen magnesium removal crystallization stirring tank. Background Technology

[0002] In zinc electrolysis production, waste electrolyte typically contains various impurities, among which magnesium ions can have numerous adverse effects on zinc electrolysis. Traditional methods for removing impurities from waste electrolyte have certain limitations. For example, while some chemical precipitation methods can remove some impurities, their effectiveness in removing magnesium ions is poor, making it difficult to meet the high purity requirements of zinc electrolysis raw materials. Moreover, chemical precipitation methods may introduce new impurities, increasing the complexity of subsequent processing. In addition, some physical separation methods, such as simple filtration or centrifugation, are almost ineffective at removing magnesium impurities in ionic form. If magnesium impurities in waste electrolyte are not effectively removed, they will gradually accumulate during zinc electrolysis, leading to increased electrolyte resistance and power consumption. Furthermore, they may also affect the quality of zinc deposition, reducing zinc purity and yield. Therefore, a highly efficient and reliable magnesium removal device for waste electrolyte is needed. Utility Model Content

[0003] To solve or partially solve the problems existing in related technologies, this application provides a frozen magnesium removal crystallization stirring tank. Through heat exchange between the cold medium and the waste electrolyte in the stirring tank, the temperature of the waste electrolyte can be rapidly reduced, causing the magnesium impurities in it to precipitate out in the form of crystals.

[0004] The first aspect of this application provides a cryogenic magnesium removal crystallization stirring tank, comprising: a waste liquid inlet, a waste liquid outlet, a refrigerant inlet, a refrigerant outlet, a heat exchange coil, a motor, and a stirring shaft. The waste liquid inlet and waste liquid outlet are installed opposite each other on both sides of the stirring tank and are located on the upper side of the stirring tank. The refrigerant inlet and refrigerant outlet are located at the top of the stirring tank and are connected to the heat exchange coil installed inside the stirring tank and a refrigerant storage device located outside the stirring tank. A motor is horizontally installed at the top of the stirring tank, and the motor output end passes through the stirring tank and extends into the stirring tank to install a stirring shaft. Multiple layers of stirring blades are installed on the stirring shaft.

[0005] The stirring shaft is also equipped with stirring rods, which are rectangular in structure and distributed around the perimeter of the mixing tank, close to the tank wall.

[0006] The stirring rod is equipped with multiple triangular blades, which are arranged opposite each other on both sides of the stirring rod and in the opposite direction to the heat exchange coil.

[0007] Among them, the heat exchange coil has a high-low trend, and the triangular blade has a low-high-low structure.

[0008] The technical solution provided in this application may include the following beneficial effects:

[0009] This application provides a cryogenic magnesium removal crystallization stirring tank. Through heat exchange between the cooling medium and the waste electrolyte within the tank, the temperature of the waste electrolyte is rapidly reduced, causing magnesium impurities to precipitate in crystal form. This effectively removes magnesium ions and other temperature-sensitive impurities from the waste electrolyte, providing high-quality raw materials for zinc electrolysis and significantly improving product quality and production efficiency. It avoids the additional energy consumption caused by adding large amounts of chemical reagents in chemical precipitation methods and the high power consumption resulting from multiple complex operations in physical separation methods. The operation process is easy to control, requiring no complex technology or equipment, reducing equipment maintenance costs and operational difficulty during production. Simultaneously, it does not introduce new chemical impurities, reducing environmental pollution.

[0010] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0011] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0012] Figure 1 This is a schematic diagram of the structure of the device shown in the embodiments of this application;

[0013] Figure 2 This is a schematic diagram of the rectangular stirring rod structure of the device shown in the embodiments of this application;

[0014] Figure label:

[0015] In the diagram, 1—crystallization mixing tank, 2—heat exchange coil, 3—motor, 4—stirring shaft, 5—stirring blade, 6—waste liquid inlet, 7—waste liquid outlet, 8—refrigerant inlet, 9—refrigerant outlet, 10—stirring rod, 11—triangular blade. Detailed Implementation

[0016] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0017] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0018] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0019] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0021] like Figure 1 The illustrated cryogenic magnesium removal crystallization mixing tank 1 includes: a waste liquid inlet 6, a waste liquid outlet 7, a refrigerant inlet 8, a refrigerant outlet 9, a heat exchange coil 2, a motor 3, and a stirring shaft 4. The waste liquid inlet 6 and waste liquid outlet 7 are installed opposite each other on both sides of the mixing tank, located on the upper side. The refrigerant inlet 8 and refrigerant outlet 9 are located at the top of the mixing tank and communicate with the heat exchange coil 2 installed inside the mixing tank and a refrigerant storage device located outside the mixing tank. The motor 3 is horizontally mounted on the top of the mixing tank, and the output end of the motor 3 passes through the mixing tank and extends into the mixing tank where the stirring shaft 4 is installed. Three layers of stirring blades 5 are installed on the stirring shaft 4.

[0022] Liquid ammonia is used as the cooling medium. It has excellent thermodynamic properties, a low boiling point (approximately -33.4℃ at normal pressure), and a large latent heat of vaporization, enabling it to absorb a significant amount of heat. This allows for efficient heat exchange with the waste electrolyte, achieving rapid cooling. Furthermore, liquid ammonia is chemically stable and does not readily react with components in the waste electrolyte, thus avoiding the introduction of new impurities.

[0023] Waste electrolyte enters the mixing tank through a waste liquid pipe, while a cooling medium enters through a coil channel. The waste electrolyte is cooled through heat exchange between the two media at different temperatures. The stirring shaft 4 and stirring blades 5 driven by motor 3 stir the mixture in the mixing tank to promote heat exchange, ultimately precipitating crystallized impurities. As long as the two media are continuously supplied, the waste electrolyte can be continuously purified, ultimately providing high-quality raw materials for zinc electrolysis.

[0024] Preferably, to further improve the stirring effect of the stirring shaft 4, a stirring rod 10 is installed on the stirring shaft 4. The stirring rod 10 has a rectangular structure and is distributed around the perimeter of the mixing tank, close to the tank wall. Multiple triangular blades 11 are provided on the stirring rod 10, and the triangular blades 11 are arranged opposite to each other on both sides of the stirring rod 10 and in the opposite direction to the heat exchange coil 2. The heat exchange coil 2 has a top-high-bottom-low orientation, and the triangular blades 11 have a top-low-bottom-high structure, such as... Figure 2 As shown.

[0025] During counter-current stirring, the impeller propels the solution flow in the opposite direction to the flow of the cooling medium inside the coil, creating counter-current heat exchange. This method increases the temperature difference between the solution and the cooling medium, improving heat exchange efficiency, resulting in more uniform cooling of the waste electrolyte and facilitating the precipitation of crystalline impurities. Simultaneously, counter-current stirring can also prevent the formation of a stagnant layer near the cylinder wall, avoiding localized temperature unevenness and further enhancing the overall stirring and heat exchange effect.

[0026] The triangular blade structure (11), with its upper lower section and lower higher section, creates a specific flow path for the solution during rotation. The blades propel the solution upwards from the bottom of the tank, creating stronger convection with the cooling medium flowing downwards in the coil. This increases the contact area and time between the two, improving heat exchange efficiency and facilitating more uniform cooling of the waste electrolyte and the precipitation of crystalline impurities. Furthermore, the triangular blades generate varying stirring forces at different heights during rotation. The bottom blades, closer to the bottom, effectively agitate the solution at the bottom, preventing the accumulation of crystalline impurities. While the upper blades are further from the bottom, their angle still encourages the flow of the upper solution, resulting in more uniform mixing throughout the tank and preventing excessive localized temperature differences. The blades' tilt direction corresponds to the coil's tilt direction, creating a synergistic effect that further smooths the flow of the solution within the tank, reduces flow resistance, and enhances stirring efficiency.

[0027] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0028] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0029] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A cryogenic magnesium removal and crystallization stirring tank, characterized in that, include: The mixing tank includes a waste liquid inlet, a waste liquid outlet, a refrigerant inlet, a refrigerant outlet, a heat exchange coil, a motor, and a stirring shaft. The waste liquid inlet and outlet are installed opposite each other on both sides of the mixing tank and are located on the upper side of the mixing tank. The refrigerant inlet and outlet are located at the top of the mixing tank and are connected to the heat exchange coil installed inside the mixing tank and the refrigerant storage device located outside the mixing tank. The motor is horizontally installed on the top of the mixing tank, and the output end of the motor passes through the mixing tank and extends into the mixing tank to install the stirring shaft. Multiple layers of stirring blades are installed on the stirring shaft.

2. The cryogenic magnesium removal crystallization stirring tank according to claim 1, characterized in that, The stirring shaft is also equipped with stirring rods, which are rectangular in structure and distributed around the perimeter of the stirring tank, close to the tank wall.

3. The cryogenic magnesium removal crystallization stirring tank according to claim 2, characterized in that, The stirring rod is provided with multiple triangular blades, which are arranged opposite to each other on both sides of the stirring rod and are arranged in the opposite direction to the heat exchange coil.

4. The cryogenic magnesium removal crystallization stirring tank according to claim 3, characterized in that, The heat exchange coil has a high-low orientation, and the triangular impeller has a low-high-low structure.

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