A stirred tank for freeze crystallization of magnesium removal

Abstract

The application relates to a stirring tank for frozen crystallization magnesium removal, and relates to the technical field of smelting equipment.A stirring tank for frozen crystallization magnesium removal comprises a tank body, a refrigeration device and a controller.The output pipeline of the tank body is connected with an external steam pipeline, when crystallization blockage occurs in the output pipeline, the second input valve is controlled to be opened, crystallization cleaning of the output pipeline is realized through high-temperature steam cleaning, rapid dissolution and removal of crystallization are realized, the cleaning efficiency is high, equipment failure caused by crystallization blockage can be effectively avoided, and the continuity of production is ensured;the refrigeration unit and the heat exchange coil are arranged, waste electrolyte can be rapidly and uniformly cooled, the crystallization efficiency is improved, and the problem of uneven crystallization caused by local supercooling can be avoided.

Description

Technical Field

[0001] This application relates to the field of smelting equipment technology, and in particular to a stirred tank for removing magnesium by freeze crystallization. Background Technology

[0002] Magnesium is a common associated impurity element in zinc concentrate and is also one of the main impurity ions that are difficult to purify and separate in hydrometallurgical zinc refining.

[0003] The freeze-crystallization technology for removing magnesium from waste electrolyte in wet zinc smelting is a physical removal method. Its principle is to control the solution properties through temperature changes, directly crystallizing and separating magnesium from the waste electrolyte to form granular magnesium sulfate crystals. The magnesium-free solution is then returned to the electrolyte preparation for recycling. The freeze-crystallization process does not require the addition of external reagents, introduces no impurity ions, does not require neutralization reactions, and produces no waste residue or wastewater containing heavy metals, thus avoiding the loss of zinc and sulfuric acid.

[0004] Currently, magnesium removal is mostly achieved by stirring the cooled waste electrolyte in a mixing tank. However, during the stirring process, the temperature of the waste electrolyte continuously rises, leading to a decrease in cooling and crystallization efficiency, and consequently a decrease in magnesium removal rate. Furthermore, the output pipes of conventional mixing tanks often experience crystallization blockage, severely impacting production continuity, and are difficult to clean, resulting in high equipment maintenance costs. Utility Model Content

[0005] To address or partially address the problems existing in related technologies, this application provides a stirred tank for cryogenic crystallization and magnesium removal, which enables the waste electrolyte to cool down rapidly and uniformly, effectively avoids equipment failures caused by crystallization blockage, and ensures the continuity of production.

[0006] This application provides a stirred tank for cryogenic crystallization to remove magnesium, comprising: a tank body, a refrigeration device, and a controller;

[0007] The tank is equipped with an agitator inside;

[0008] The tank's input pipe is connected to an external waste electrolyte pipe, and a first input valve is installed on the input pipe;

[0009] The tank's output pipes are connected to the first output pump and an external steam pipe, respectively. A first output valve is installed on the pipe connected to the first output pump, and a second input valve is installed on the pipe connected to the external steam pipe.

[0010] The refrigeration device includes a refrigeration unit and a heat exchange coil. The heat exchange coil is annular and is installed inside the tank, close to the inner wall of the tank.

[0011] The controller establishes electrical connections with the agitator, refrigeration unit, first input valve, first output valve, second input valve, and first output pump, respectively.

[0012] Optionally, in some embodiments of this application:

[0013] The bottom of the tank has rounded sides.

[0014] Optionally, in some embodiments of this application:

[0015] The bottom inner wall of the tank is coated with an anti-crystallization coating.

[0016] Optionally, in some embodiments of this application:

[0017] The tank is equipped with a liquid level sensor inside;

[0018] The controller establishes an electrical connection with the liquid level sensor.

[0019] Optionally, in some embodiments of this application:

[0020] The tank is equipped with a temperature sensor.

[0021] The controller establishes an electrical connection with the temperature sensor.

[0022] The technical solution provided in this application may include the following beneficial effects:

[0023] This application connects the tank's output pipe to an external steam pipe. When crystallization blockage occurs in the output pipe, there is no need to stop the machine for disassembly. By controlling the opening of the second input valve, the output pipe can be cleaned with high-temperature steam to quickly dissolve and remove crystals. This method has high cleaning efficiency, effectively avoids equipment failure caused by crystallization blockage, and ensures continuous production.

[0024] This application, by setting up a refrigeration unit and heat exchange coil, enables the waste electrolyte to be cooled quickly and evenly, improving crystallization efficiency and avoiding uneven crystallization caused by local overcooling.

[0025] 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

[0026] 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.

[0027] Figure 1This is a schematic diagram of a stirred tank used for cryogenic crystallization to remove magnesium in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the control structure of the controller in an embodiment of this application.

[0029] Reference numerals in the attached drawings: 1-Tank body, 101-Agitator, 102-First input valve, 103-First output pump, 104-First output valve, 105-Second input valve, 106-Anti-crystallization coating, 2-Refrigeration device, 201-Refrigeration unit, 202-Heat exchange coil, 3-Controller, 4-Liquid level sensor, 5-Temperature sensor. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] Currently, magnesium removal is mostly achieved by stirring the cooled waste electrolyte in a mixing tank. However, during the stirring process, the temperature of the waste electrolyte continuously rises, leading to a decrease in cooling and crystallization efficiency, and consequently a decrease in magnesium removal rate. Furthermore, the output pipes of conventional mixing tanks often experience crystallization blockage, severely impacting production continuity, and are difficult to clean, resulting in high equipment maintenance costs.

[0035] To address the aforementioned issues, this application provides a stirred tank for cryogenic crystallization to remove magnesium, which enables the waste electrolyte to cool down rapidly and uniformly, effectively preventing equipment failures caused by crystallization blockage and ensuring production continuity.

[0036] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of a stirred tank used for cryogenic crystallization to remove magnesium in an embodiment of this application;

[0038] Figure 2 This is a schematic diagram of the control structure of the controller in an embodiment of this application.

[0039] See Figure 1-2 A stirred tank for removing magnesium by cryogenic crystallization includes: a tank body 1, a refrigeration device 2, and a controller 3.

[0040] The tank 1 is equipped with a stirrer 101.

[0041] The input pipe of the tank 1 is connected to the external waste electrolyte pipe, and a first input valve 102 is installed on the input pipe.

[0042] The output pipe of the tank 1 is connected to the first output pump 103 and the external steam pipe respectively. A first output valve 104 is provided on the pipe connected to the first output pump 103, and a second input valve 105 is provided on the pipe connected to the external steam pipe.

[0043] In this embodiment, by connecting the output pipe of tank 1 to an external steam pipe, when crystallization blockage occurs in the output pipe, there is no need to stop the machine for disassembly. By controlling the opening of the second input valve 105, the output pipe can be cleaned by high-temperature steam cleaning, which can quickly dissolve and remove crystals. The cleaning efficiency is high, which can effectively avoid equipment failure caused by crystallization blockage and ensure the continuity of production.

[0044] Specifically: the bottom sides of the tank 1 are arc-shaped.

[0045] Specifically: the bottom inner wall of the tank 1 is provided with an anti-crystallization coating 106.

[0046] In this embodiment, by adopting an arc-shaped structure, the amount of crystallization and scaling at the bottom can be reduced, and by providing an anti-crystallization coating 106, the amount of crystallization can be further reduced.

[0047] The refrigeration device 2 includes a refrigeration unit 201 and a heat exchange coil 202. The heat exchange coil 202 is annular and is installed inside the tank 1, close to the inner wall of the tank 1.

[0048] In this embodiment, by setting up a refrigeration unit 201 and a heat exchange coil 202, the waste electrolyte can be cooled down quickly and evenly, the crystallization efficiency can be improved, and the problem of uneven crystallization caused by local overcooling can be avoided.

[0049] Specifically: a liquid level sensor 4 is installed inside the tank 1; an electrical connection is established between the controller 3 and the liquid level sensor 4.

[0050] In this embodiment, by setting a liquid level sensor 4, when the liquid level exceeds the limit, the first input valve 102 can be controlled to automatically cut off the feed and ensure production safety.

[0051] Specifically: a temperature sensor 5 is installed inside the tank 1; an electrical connection is established between the controller 3 and the temperature sensor 5.

[0052] In this embodiment, by setting a temperature sensor 5, the temperature of the waste electrolyte in the tank 1 can be monitored in real time, ensuring the normal operation of the stirring crystallization.

[0053] The controller 3 establishes electrical connections with the stirrer 101, the refrigeration unit 201, the first input valve 102, the first output valve 104, the second input valve 105, and the first output pump 103, respectively.

[0054] In this embodiment, the controller 3 is a PLC controller 3, which performs unified control to improve automation efficiency.

[0055] The technical solutions provided in this application have the following beneficial effects:

[0056] This application connects the output pipe of tank 1 to an external steam pipe. When crystallization blockage occurs in the output pipe, there is no need to stop the machine for disassembly. By controlling the opening of the second input valve 105, the output pipe can be cleaned by high-temperature steam cleaning, which can quickly dissolve and remove crystals. The cleaning efficiency is high, which can effectively avoid equipment failure caused by crystallization blockage and ensure the continuity of production.

[0057] By setting up a refrigeration unit 201 and a heat exchange coil 202, this application enables the waste electrolyte to cool down quickly and evenly, improves crystallization efficiency, and avoids the problem of uneven crystallization caused by local overcooling.

[0058] 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.

[0059] 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 stirred tank for removing magnesium by freeze crystallization, characterized in that, include: Tank (1), refrigeration device (2) and controller (3); The tank (1) is equipped with a stirrer (101). The input pipe of the tank (1) is connected to the external waste electrolyte pipe, and a first input valve (102) is provided on the input pipe. The output pipe of the tank (1) is connected to the first output pump (103) and the external steam pipe respectively. A first output valve (104) is provided on the pipe connected to the first output pump (103), and a second input valve (105) is provided on the pipe connected to the external steam pipe. The refrigeration device (2) includes: a refrigeration unit (201) and a heat exchange coil (202). The heat exchange coil (202) is annular and is installed inside the tank (1) in close contact with the inner wall of the tank (1). The controller (3) establishes electrical connections with the stirrer (101), the refrigeration unit (201), the first input valve (102), the first output valve (104), the second input valve (105), and the first output pump (103), respectively.

2. The stirred tank for removing magnesium by freeze crystallization according to claim 1, characterized in that: The bottom sides of the tank (1) are arc-shaped.

3. The stirred tank for removing magnesium by freeze crystallization according to claim 2, characterized in that: The tank (1) has an anti-crystallization coating (106) on its bottom inner wall.

4. The stirred tank for removing magnesium by freeze crystallization according to claim 3, characterized in that: A liquid level sensor (4) is installed inside the tank (1). An electrical connection is established between the controller (3) and the liquid level sensor (4).

5. The stirred tank for removing magnesium by freeze crystallization according to claim 4, characterized in that: A temperature sensor (5) is installed inside the tank (1); An electrical connection is established between the controller (3) and the temperature sensor (5).

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