Crystallizer for potassium chloride production and potassium chloride production system

Abstract

The utility model provides a crystallizer for potassium chloride production and a potassium chloride production system. The crystallizer for potassium chloride production comprises a crystallizing tank; the bottom of the decomposition tank is provided with a liquid inlet communicated with an inner cavity of the decomposition tank, the top of the decomposition tank is provided with a liquid outlet communicated with the inner cavity of the decomposition tank, the discharging end of the crystallization tank is communicated with the liquid inlet, and the liquid outlet is constructed to be communicated with flotation equipment; the first filter structure comprises a first filter screen, the first filter screen divides the inner cavity of the decomposition tank into a first inner cavity and a second inner cavity which are communicated with each other, the liquid inlet is communicated with the first inner cavity, and the liquid outlet is communicated with the second inner cavity. According to the technical scheme, the crystallizer for potassium chloride production can solve the problems that in the process that an existing device is used for producing potassium chloride through a cold crystallization direct flotation method, an underflow pump, a stone sinking valve and the like of the crystallizer are frequently blocked, the process is often forced to be interrupted, and production efficiency is seriously affected.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production equipment, and in particular to a crystallizer for potassium chloride production and a potassium chloride production system. Background Art

[0002] The cold crystallization positive flotation method for producing potassium chloride is one of the most common technologies for producing potash fertilizers. Compared with the traditional cold decomposition positive flotation method, it solves the problem of small product particle size, that is, it upgrades powdered potassium chloride to crystal particles, making the product particle size and color better. However, in the process of using the cold crystallization positive flotation method to produce potassium chloride, since the raw ore used in the workshop is dry-mined from salt fields, a large amount of debris (beverage bottles, sacks, stones, steel parts, auto parts, etc.) is entrained in the raw ore, which makes the underflow pump and stone sinking valve of the crystallizer frequently blocked, causing the process to be frequently interrupted, seriously affecting production efficiency. Utility Model Content

[0003] The main purpose of the utility model is to provide a crystallizer for potassium chloride production and a potassium chloride production system, which can solve the problem that in the process of using the existing device to produce potassium chloride by cold crystallization positive flotation method, the underflow pump, the stone sinking valve and the like of the crystallizer are frequently blocked, resulting in frequent forced interruption of the process and serious impact on production efficiency.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a crystallizer for potassium chloride production is provided, comprising: a crystallizer; a decomposition tank, wherein the bottom of the decomposition tank is provided with a liquid inlet connected to the inner cavity of the decomposition tank, the top of the decomposition tank is provided with a liquid outlet connected to the inner cavity of the decomposition tank, the discharge end of the crystallizer is connected to the liquid inlet, and the liquid outlet is configured to be connected to a flotation device; a first filtering structure, the first filtering structure is installed in the inner cavity of the decomposition tank, the first filtering structure comprises a first filter screen, the first filter screen is located between the liquid inlet and the liquid outlet, the first filter screen divides the inner cavity of the decomposition tank into a first inner cavity and a second inner cavity that are connected, the liquid inlet is connected to the first inner cavity, and the liquid outlet is connected to the second inner cavity.

[0005] Furthermore, there are multiple first filter screens, and the multiple first filter screens are arranged at intervals along the vertical direction.

[0006] Furthermore, the crystallizer for potassium chloride production also includes a second filtering structure, which is arranged at the liquid outlet and includes a second filter screen.

[0007] Furthermore, the second filter screen is a columnar structure; and / or the mesh diameter of the second filter screen is smaller than the mesh diameter of the first filter screen.

[0008] Furthermore, the crystallizer for potassium chloride production also includes a first conveying pipeline, the decomposition tank is located below the crystallization tank, one end of the first conveying pipeline is connected to the discharge end of the crystallization tank, and the other end of the first conveying pipeline is connected to the liquid inlet.

[0009] Furthermore, the crystallizer for potassium chloride production also includes a second delivery pipeline, an overflow port is provided on the top of the decomposition tank, one end of the second delivery pipeline is connected to the overflow port, and the other end of the second delivery pipeline is connected to the inner cavity of the crystallization tank.

[0010] Furthermore, the crystallizer for potassium chloride production also includes a first fresh water pipe, one end of which is connected to the inner cavity of the decomposition tank, and the other end of the first fresh water pipe is constructed to be able to communicate with an external water source.

[0011] Furthermore, the crystallizer for potassium chloride production also includes a second fresh water pipe, one end of which is connected to the inner cavity of the crystallization tank, and the other end of the second fresh water pipe is constructed to be able to be connected to an external water source, and the inner diameter of the second fresh water pipe is larger than the inner diameter of the first fresh water pipe.

[0012] Furthermore, a slag discharge port is provided at the bottom of the decomposition tank, and the slag discharge port is arranged opposite to the liquid inlet.

[0013] According to another aspect of the utility model, a potassium chloride production system is provided, comprising: the above-mentioned crystallizer for potassium chloride production; and a flotation device, wherein the liquid outlet is connected to the flotation device.

[0014] By applying the technical solution of the utility model, a crystallization tank, a decomposition tank and a first filtering structure are provided. The first filtering structure is installed in the inner cavity of the decomposition tank. The first filter screen divides the inner cavity of the decomposition tank into a first inner cavity and a second inner cavity that are connected. The slurry continuously flows into the first inner cavity from the bottom of the decomposition tank, then flows into the second inner cavity after passing through the first filter screen, and finally flows out from the liquid outlet at the top of the decomposition tank. The first filter screen can intercept impurities in the slurry in the first inner cavity, thereby avoiding frequent blockage of the underflow pump and the stone sinking valve of the crystallizer, ensuring the continuity of production, and thus improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0016] In the figure:

[0017] Figure 1 The schematic diagram of the structure of a crystallizer for potassium chloride production according to an embodiment of the utility model is shown.

[0018] The above drawings include the following reference numerals:

[0019] 10. Crystallization tank; 11. First inner cavity; 12. Second inner cavity; 20. Decomposition tank; 21. Liquid inlet; 22. Overflow; 23. Slag outlet; 30. First filter screen; 40. First conveying pipeline; 41. First gate valve; 50. Second conveying pipeline; 60. First fresh water pipe; 70. Second fresh water pipe; 80. First stirring mechanism; 81. First drive motor; 82. First stirring shaft; 83. First stirring blade; 90. Second stirring mechanism; 91. Second drive motor; 92. Second stirring shaft; 93. Second stirring blade; 100. Flotation equipment; 101. Discharge pipeline; 102. Waste slag pool; 103. First conveying mechanism; 104. Second conveying mechanism; 105. Third conveying pipeline; 106. Second gate valve; 200. Second filter screen. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] In the prior art, there are a large number of light impurities in the debris entrained by the underflow of the crystallizer. After the impurities enter the tank body, they will float or suspend on the surface of the tank slurry due to their small gravity and large volume, and enter the crystallizer underflow pump through the discharge port, causing frequent blockage of the underflow pump impeller.

[0022] In order to solve the above problems, Figure 1 As shown, the utility model provides a crystallizer for potassium chloride production, which includes: a crystallizer 10; a decomposition tank 20, wherein the bottom of the decomposition tank 20 is provided with a liquid inlet 21 connected to the inner cavity of the decomposition tank 20, and the top of the decomposition tank 20 is provided with a liquid outlet connected to the inner cavity of the decomposition tank 20, the discharge end of the crystallizer 10 is connected to the liquid inlet 21, and the liquid outlet is configured to be connected to a flotation device 100; a first filtering structure, which is installed in the inner cavity of the decomposition tank 20, and the first filtering structure includes a first filter screen 30, which is located between the liquid inlet 21 and the liquid outlet, and the first filter screen 30 divides the inner cavity of the decomposition tank 20 into a first inner cavity 11 and a second inner cavity 12 that are connected, the liquid inlet 21 is connected to the first inner cavity 11, and the liquid outlet is connected to the second inner cavity 12.

[0023] In this embodiment, the crystallizer for potassium chloride production also includes a discharge pipe 101, one end of which is connected to the liquid outlet, and the other end of the discharge pipe 101 is connected to the flotation device 100, and the underflow pump and the stone sinking valve are arranged on the discharge pipe 101. The raw ore (containing carnallite) and the mother liquor are added to the inner cavity of the crystallizer respectively, and the two are mixed in the inner cavity of the crystallizer to fully dissolve the carnallite and crystallize the potassium chloride. The mixed slurry flows out through the discharge end of the crystallizer 10 and enters the inner cavity of the decomposition tank 20 through the liquid inlet 21. Since the liquid inlet 21 is located at the bottom of the decomposition tank 20, the liquid outlet is located at the top of the decomposition tank 20, and the first filter screen 30 separates the inner cavity of the decomposition tank 20 into a first inner cavity 11 and a second inner cavity 12 that are connected, that is, the slurry continuously flows into the first inner cavity 11 from the bottom of the decomposition tank 20, and then flows into the second inner cavity 12 after passing through the first filter screen 30, and finally flows out from the liquid outlet at the top of the decomposition tank 20. Through the above arrangement, the first filter screen 30 can intercept impurities in the slurry in the first inner cavity 11, thereby avoiding frequent blockage of the underflow pump and the stone sinking valve of the crystallizer, ensuring the continuity of production, and thus improving production efficiency.

[0024] In one embodiment, the first filter screen 30 is formed by welding a plurality of seamless steel pipes.

[0025] In one embodiment, the mesh diameter of the first filter screen 30 is 50 mm. According to the measurement of the material through the underflow pump impeller, solid debris with a diameter less than 50 mm can pass directly through the impeller.

[0026] like Figure 1 As shown, in one embodiment of the utility model, the crystallizer for potassium chloride production further includes a first stirring mechanism 80 and a second stirring mechanism 90, the first stirring mechanism 80 includes a first drive motor 81 and a first stirring shaft 82, the first end of the first stirring shaft 82 is drivingly connected to the first drive motor 81, the second end of the first stirring shaft 82 is located in the inner cavity of the crystallizer 10, and the second end of the first stirring shaft 82 is provided with a plurality of first stirring blades 83. The first stirring mechanism 80 is provided to stir the carnallite and the mother liquor in the inner cavity of the crystallizer 10 to accelerate the dissolution of the carnallite.

[0027] The second stirring mechanism 90 includes a second drive motor 91 and a second stirring shaft 92, the first end of the second stirring shaft 92 is connected to the second drive motor 91, the second end of the second stirring shaft 92 is located in the inner cavity of the decomposition tank 20, and the second end of the second stirring shaft 92 is provided with a plurality of second stirring blades 93. The setting of the second stirring mechanism 90 can accelerate the dissolution of carnallite. In addition, the setting of the first stirring mechanism 80 and the second stirring mechanism 90 can also make the slurry form a steady flow state in the crystallization tank 10 and the decomposition tank 20, prevent the slurry from settling, and can also stir the impurities (stones, iron blocks and some large ore particles that are not completely decomposed) in the slurry, so that they can settle to the bottom of the crystallization tank 10 and the decomposition tank 20 by themselves, and the large ore particles can continue to dissolve during the stirring process, and collide with some iron blocks and stones and decompose rapidly.

[0028] like Figure 1 As shown, in one embodiment of the utility model, the crystallization tank 10 is located above the decomposition tank 20, and there is a height difference between the two. The slurry level in the crystallization tank 10 is higher than the slurry level in the decomposition tank 20. Therefore, automatic liquid filling can be achieved, that is, the slurry in the inner cavity of the crystallization tank 10 can automatically enter the inner cavity of the decomposition tank 20 through the first conveying pipe 40.

[0029] like Figure 1 As shown, in one embodiment of the present invention, there are multiple first filter screens 30, and the multiple first filter screens 30 are arranged at intervals along the vertical direction.

[0030] In this embodiment, there are multiple first filter screens 30, and the first filter screen 30 located at the bottom divides the inner cavity of the decomposition tank 20 into a first inner cavity 11 and a second inner cavity 12, and the remaining first filter screens 30 are arranged in the second inner cavity 12 at intervals along the vertical direction. The arrangement of multiple first filter screens 30 can achieve multiple filtering and interception, thereby improving the filtering and interception effect of impurities.

[0031] like Figure 1 As shown, in one embodiment of the utility model, the crystallizer for potassium chloride production also includes a second filtering structure, the second filtering structure is arranged at the liquid outlet, and the second filtering structure includes a second filter screen 200.

[0032] Through the above arrangement, secondary filtration and interception of slurry impurities can be achieved.

[0033] like Figure 1 As shown, in one embodiment of the present invention, the second filter screen 200 is a columnar structure.

[0034] Through the above arrangement, the contact area between the slurry and the second filter screen 200 can be increased, and the filtering effect is better.

[0035] like Figure 1As shown, in one embodiment of the present invention, the mesh diameter of the second filter screen 200 is smaller than the mesh diameter of the first filter screen 30 .

[0036] Through the above arrangement, smaller impurities that cannot be intercepted by the first filter 30 can be intercepted, further improving the filtering effect.

[0037] like Figure 1 As shown, in one embodiment of the utility model, the crystallizer for potassium chloride production also includes a first delivery pipeline 40, the decomposition tank 20 is located below the crystallization tank 10, one end of the first delivery pipeline 40 is connected to the discharge end of the crystallization tank 10, and the other end of the first delivery pipeline 40 is connected to the liquid inlet 21.

[0038] Through the above arrangement, the slurry in the inner cavity of the crystallization tank 10 can be transported to the inner cavity of the decomposition tank 20 .

[0039] In one embodiment, the diameter of the first delivery pipe 40 is 200 mm.

[0040] like Figure 1 As shown, in one embodiment of the present invention, a first gate valve 41 is provided on the first delivery pipeline 40 .

[0041] like Figure 1 As shown, in one embodiment of the utility model, the crystallizer for potassium chloride production also includes a second delivery pipeline 50, an overflow port 22 is provided on the top of the decomposition tank 20, one end of the second delivery pipeline 50 is connected to the overflow port 22, and the other end of the second delivery pipeline 50 is connected to the inner cavity of the crystallization tank 10.

[0042] In this embodiment, the discharge pipe 101 is provided with a first conveying mechanism 103, which is used to convey the slurry in the discharge pipe 101 to the flotation device 100, and the second conveying pipe 50 is provided with a second conveying mechanism 104, which is used to convey the slurry in the second conveying pipe 50 to the inner cavity of the crystallizer. When the decomposition tank 20 needs to be maintained and repaired, the gate valve on the first conveying pipe 40 is closed to stop the first conveying mechanism 103 from working and the second conveying mechanism 104 is operated. At this time, the slurry in the inner cavity of the decomposition tank 20 can be conveyed back to the inner cavity of the crystallizer through the second conveying pipe 50.

[0043] In one embodiment, the second conveying mechanism 104 is a slurry pump, and the diameter of the overflow port 22 is 300 mm.

[0044] like Figure 1 As shown, in one embodiment of the utility model, the crystallizer for potassium chloride production also includes a first fresh water pipe 60, one end of the first fresh water pipe 60 is connected to the inner cavity of the decomposition tank 20, and the other end of the first fresh water pipe 60 is constructed to be able to communicate with an external water source.

[0045] Through the above arrangement, fresh water can be added to the inner cavity of the decomposition tank 20 for the crystallization and decomposition of potassium chloride.

[0046] like Figure 1 As shown, in one embodiment of the utility model, the crystallizer for potassium chloride production also includes a second fresh water pipe 70, one end of the second fresh water pipe 70 is connected to the inner cavity of the crystallization tank 10, and the other end of the second fresh water pipe 70 is constructed to be able to communicate with an external water source, and the inner diameter of the second fresh water pipe 70 is larger than the inner diameter of the first fresh water pipe 60.

[0047] In this embodiment, fresh water is transported to the inner cavity of the crystallizer 10 through the second fresh water pipe 70 for decomposing the raw ore. The inner diameter of the second fresh water pipe 70 is larger than the inner diameter of the first fresh water pipe 60. On the one hand, it can ensure that the carnallite in the inner cavity of the crystallizer 10 is fully decomposed, and on the other hand, it can avoid the problem of potassium chloride loss caused by adding too much fresh water after the decomposed slurry in the inner cavity of the crystallizer 10 enters the decomposition tank 20.

[0048] like Figure 1 As shown, in one embodiment of the present invention, a slag discharge port 23 is disposed at the bottom of the decomposition tank 20 , and the slag discharge port 23 is disposed opposite to the liquid inlet 21 .

[0049] In this embodiment, a slag discharge port 23 is provided at the bottom of the decomposition tank 20 , and impurities intercepted by the first filter screen 30 in the first inner cavity 11 can be discharged through the slag discharge port 23 .

[0050] In one embodiment, the diameter of the slag discharge port 23 is 200 mm.

[0051] like Figure 1 As shown, in one embodiment of the utility model, the crystallizer for potassium chloride production further includes a third delivery pipeline 105 and a waste residue pool 102, one end of the third delivery pipeline 105 is connected to the slag discharge port 23, and the other end of the third delivery pipeline 105 is connected to the waste residue pool 102. The third delivery pipeline 105 is provided with a second gate valve 106, and the second gate valve 106 is used to control the connection and disconnection of the third delivery pipeline 105 and the waste residue pool 102. Impurities in the inner cavity of the decomposition tank 20 can enter the third delivery pipeline 105 through the slag discharge port 23, and then be discharged to the waste residue pool 102.

[0052] The utility model also provides a potassium chloride production system, which includes the above-mentioned crystallizer for potassium chloride production; and a flotation device 100, wherein the liquid outlet is connected to the flotation device 100.

[0053] In this embodiment, the potassium chloride production crystallizer of the potassium chloride production system has all the technical solutions and all the technical effects of the above-mentioned potassium chloride production crystallizer, which will not be repeated here.

[0054] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: a crystallization tank, a decomposition tank and a first filtering structure are provided, the first filtering structure is installed in the inner cavity of the decomposition tank, the first filter screen divides the inner cavity of the decomposition tank into a first inner cavity and a second inner cavity that are connected, the slurry continuously flows into the first inner cavity from the bottom of the decomposition tank, then flows into the second inner cavity after passing through the first filter screen, and finally flows out from the liquid outlet at the top of the decomposition tank, the first filter screen can intercept impurities in the slurry in the first inner cavity, thereby avoiding frequent blockage of the underflow pump and the stone sinking valve of the crystallizer, ensuring the continuity of production, and thus improving production efficiency.

[0055] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0057] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A crystallizer for potassium chloride production, characterized in that: include: Crystallization tank (10); A decomposition tank (20), wherein a liquid inlet (21) communicating with the inner cavity of the decomposition tank (20) is disposed at the bottom of the decomposition tank (20), a liquid outlet communicating with the inner cavity of the decomposition tank (20) is disposed at the top of the decomposition tank (20), a discharge end of the crystallization tank (10) is communicated with the liquid inlet (21), and the liquid outlet is configured to communicate with a flotation device; A first filtering structure, the first filtering structure is installed in the inner cavity of the decomposition tank (20), the first filtering structure comprises a first filter screen (30), the first filter screen (30) is located between the liquid inlet (21) and the liquid outlet, the first filter screen (30) divides the inner cavity of the decomposition tank (20) into a first inner cavity (11) and a second inner cavity (12) which are connected to each other, the liquid inlet (21) is connected to the first inner cavity (11), and the liquid outlet is connected to the second inner cavity (12).

2. The potassium chloride production crystallizer according to claim 1, characterized in that There are a plurality of the first filter screens (30), and the plurality of the first filter screens (30) are arranged at intervals in the vertical direction.

3. The potassium chloride production crystallizer according to claim 1, characterized in that The crystallizer for potassium chloride production also includes a second filtering structure, which is arranged at the liquid outlet and includes a second filter screen (200).

4. The potassium chloride production crystallizer according to claim 3, characterized in that The second filter screen (200) is a columnar structure; and / or the mesh diameter of the second filter screen (200) is smaller than the mesh diameter of the first filter screen (30).

5. The potassium chloride production crystallizer according to claim 1, characterized in that The crystallizer for potassium chloride production further comprises a first delivery pipeline (40), the decomposition tank (20) is located below the crystallization tank (10), one end of the first delivery pipeline (40) is connected to the discharge end of the crystallization tank (10), and the other end of the first delivery pipeline (40) is connected to the liquid inlet (21).

6. The crystallizer for producing potassium chloride according to claim 1, characterized in that The crystallizer for producing potassium chloride further comprises a second delivery pipeline (50); an overflow port (22) is provided at the top of the decomposition tank (20); one end of the second delivery pipeline (50) is in communication with the overflow port (22); and the other end of the second delivery pipeline (50) is in communication with the inner cavity of the crystallization tank (10).

7. The crystallizer for potassium chloride production according to claim 1, characterized in that The potassium chloride production crystallizer further comprises a first fresh water pipe (60), one end of which is in communication with the inner cavity of the decomposition tank (20), and the other end of which is configured to be in communication with an external water source.

8. The crystallizer for potassium chloride production according to claim 7, characterized in that The potassium chloride production crystallizer further comprises a second fresh water pipe (70), one end of the second fresh water pipe (70) being in communication with the inner cavity of the crystallization tank (10), the other end of the second fresh water pipe (70) being configured to be in communication with the external water source, and the inner diameter of the second fresh water pipe (70) being greater than the inner diameter of the first fresh water pipe (60).

9. The crystallizer for potassium chloride production according to claim 1, characterized in that The bottom of the decomposition tank (20) is provided with a slag discharge port (23), and the slag discharge port (23) is arranged opposite to the liquid inlet (21).

10. A potassium chloride production system, characterized in that: include: The crystallizer for potassium chloride production according to any one of claims 1 to 9; as well as A flotation device (100), wherein the liquid outlet is in communication with the flotation device (100).

Images