Device for recovering refined potassium in potassium chloride production process

Abstract

The utility model discloses a device for recovering refined potassium in a potassium chloride production process, which belongs to the technical field of potassium chloride production, and comprises a coarse potassium centrifuge, a coarse potassium tank is communicated below the coarse potassium centrifuge, one side of the coarse potassium tank is communicated with a refined potassium centrifuge, and the other side of the coarse potassium tank is communicated with the refined potassium centrifuge. One side of the refined potassium centrifugal machine is communicated with a refined potassium tank; a partition plate is arranged in the middle of the post-throwing liquid tank, the post-throwing liquid tank is divided into two independent areas by the partition plate, the two independent areas are respectively communicated with the crude potassium centrifugal machine and the fine potassium centrifugal machine through pipelines, and the other side of the post-throwing liquid tank is communicated with a settler; a thickener and a refined potassium slurry tank are arranged between the refined potassium tank and the post-throwing liquid tank, and the crude potassium centrifugal machine is used for performing centrifugal separation on a crude potassium raw material; and the refined potassium centrifugal machine is used for centrifugally separating the refined potassium raw material.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of potassium chloride production, and more particularly to a device for recovering refined potassium in the potassium chloride production process. BACKGROUND

[0002] In the field of chemical production, potassium chloride is an extremely important product with a wide range of uses. It is mainly used as a fertilizer and plays a key role in improving crop yield and quality in agricultural production. At the same time, potassium chloride is also an important raw material for the manufacture of many other chemical products, such as potassium nitrate, potassium carbonate, potassium chlorate, and other potassium salts, and caustic potash, etc. These potassium salts have indispensable applications in many industrial sectors such as chemical glass, medicine, textiles, papermaking, matches, explosives, and fireworks.

[0003] Currently, the production process of potassium chloride mostly uses brine after salt production as raw material and adopts the method of mixing brine for production. The basic process is (such as Figure 3 ) first mix the brine after salt production with the carnallite mother liquor and by-product brine generated in the system, discharge the mixed brine during this process, then the clear liquid enters the evaporation system for evaporation and concentration to obtain a complete liquid, and then the complete liquid is subjected to heat preservation and sedimentation separation, and the liquid phase is then crystallized and precipitated by cooling to obtain carnallite (KCl・MgCl・6H2O). The carnallite is finally obtained by a series of operations such as water decomposition and washing to obtain finished potassium chloride. However, in the existing production process, there is a prominent problem, i.e., the extraction rate of potassium chloride production single line is low (such as Figure 2 ). This not only leads to waste of raw material resources and increases production cost, but also limits the production efficiency and market competitiveness of enterprises to some extent. How to invent a device for recovering refined potassium in the potassium chloride production process to improve these problems has become a problem to be solved by technical personnel in the field. SUMMARY

[0004] In order to make up for the above shortcomings, the utility model provides a device for recovering refined potassium in the potassium chloride production process, aiming to improve the problem of low extraction rate of potassium chloride production single line and waste of raw material resources.

[0005] The utility model is implemented as follows: a device for recovering refined potassium in the potassium chloride production process, comprising

[0006] A crude potassium centrifuge is provided below the crude potassium centrifuge, a refined potassium centrifuge is provided on one side of the crude potassium tank, and a refined potassium tank is provided on one side of the refined potassium centrifuge.

[0007] A post-spinning liquid tank is provided in the middle of the post-spinning liquid tank, the post-spinning liquid tank is divided into two independent areas by the partition, the two independent areas are respectively connected with the crude potassium centrifuge and the refined potassium centrifuge through pipelines, and a settler is provided on the other side of the post-spinning liquid tank.

[0008] The thickener and the fine potassium slurry tank are arranged between the fine potassium tank and the post-throwing liquid tank.

[0009] In a preferred technical scheme of the utility model, the internal input of the fine potassium centrifuge is fine potassium raw material, and the fine potassium tank is communicated with the fine potassium product output end of the fine potassium centrifuge through a pipeline.

[0010] In a preferred technical scheme of the utility model, the post-throwing liquid output pipe of the fine potassium centrifuge after centrifugation is communicated with one independent area of the post-throwing liquid tank.

[0011] In a preferred technical scheme of the utility model, the internal input of the fine potassium centrifuge is fine potassium raw material, and the fine potassium tank is communicated with the fine potassium product output end of the fine potassium centrifuge through a pipeline.

[0012] In a preferred technical scheme of the utility model, the post-throwing liquid output pipe of the fine potassium centrifuge after centrifugation is communicated with one independent area of the post-throwing liquid tank.

[0013] In a preferred technical scheme of the utility model, the thickener is installed on one side of the post-throwing liquid tank, and the thickener is communicated with the downstream of the fine potassium post-throwing liquid area of the post-throwing liquid tank through a conveying pipeline.

[0014] In a preferred technical scheme of the utility model, the fine potassium slurry tank is communicated with the thickener, the fine potassium slurry tank is installed below the thickener and is communicated with the conical bottom of the thickener through a pipeline.

[0015] In a preferred technical scheme of the utility model, the thickener is installed on one side of the post-throwing liquid tank, and the thickener is communicated with the downstream of the fine potassium post-throwing liquid area of the post-throwing liquid tank through a conveying pipeline.

[0016] In a preferred technical scheme of the utility model, the overflow port of the thickener is communicated with an external by-product brine recovery system through a pipeline.

[0017] In a preferred technical scheme of the utility model, the bottom of the receiving fine potassium post-throwing liquid area in the post-throwing liquid tank is provided with a liquid discharge port.

[0018] The utility model discloses a beneficial effect is: the utility model discloses a device for potassium chloride production process fine potassium recovery through the above -mentioned design, effective separation and recycling are carried out to the liquid after centrifugation of the coarse potassium centrifuge and fine potassium centrifuge, especially, the solid phase in the fine potassium liquid after centrifugation is fully recovered, can obviously promote the yield of potassium chloride product, reduces raw material waste, improves the economic benefit of enterprise. With the improvement of product yield, under the condition of same raw material input, more finished potassium chloride can be obtained, thereby the production cost of unit product is reduced. Meanwhile, the device needs less equipment investment, and the original system is low in degree of modification, further save the cost. The overflow clear liquid on the thickener returns to the brine mixing process as by-product brine, realizes the cyclic utilization of resources, improves the resource utilization rate in the whole production process, and accords with the concept of sustainable development. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments, it should be understood, the following drawings only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art, under the premise of not paying creative labor, can also obtain other related drawings according to these drawings.

[0020] Figure 1 It is the improved liquid after centrifugation process schematic diagram provided by the embodiments of the utility model;

[0021] Figure 2 It is the improved liquid after centrifugation process schematic diagram provided by the embodiments of the utility model;

[0022] Figure 3 It is the industrial potassium chloride product process flow block diagram provided by the embodiments of the utility model.

[0023] In the drawing: 1, coarse potassium centrifuge;2, fine potassium centrifuge;3, coarse potassium tank;4, fine potassium tank;5, liquid after centrifugation tank;6, settler;7, thickener;8, fine potassium slurry tank. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantage of the embodiments of the utility model more clear, the following will be combined with the drawings in the embodiments of the utility model, and the technical scheme in the embodiments of the utility model is clearly and completely described, obviously, the described embodiments are part of the embodiments of the utility model, instead of all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary skilled person in the art without making creative labor belong to the scope of the utility model protection.

[0025] Please refer to Figure 1The utility model provides a technical scheme: a device for recovering fine potassium in potassium chloride production process, which comprises

[0026] The centrifuge 1 is used for centrifugal separation of the coarse potassium raw material, and the centrifuge 2 is used for centrifugal separation of the fine potassium raw material.

[0027] The centrifuge 1 is used for centrifugal separation of the coarse potassium raw material, and the centrifuge 2 is used for centrifugal separation of the fine potassium raw material.

[0028] The centrifuge 1 is used for centrifugal separation of the coarse potassium raw material, and the centrifuge 2 is used for centrifugal separation of the fine potassium raw material.

[0029] The centrifuge 1 is used for centrifugal separation of the coarse potassium raw material, and the centrifuge 2 is used for centrifugal separation of the fine potassium raw material.

[0030] The centrifuge 1 is used for centrifugal separation of the coarse potassium raw material, and the centrifuge 2 is used for centrifugal separation of the fine potassium raw material.

[0031] The centrifuge 1 is used for centrifugal separation of the coarse potassium raw material, and the centrifuge 2 is used for centrifugal separation of the fine potassium raw material.

[0032] The settler 6 is installed on one side of the post-spinning liquid tank 5, and the settler 6 is connected with the downstream area of the post-spinning liquid area of the post-spinning liquid tank 5 through a pipeline, and is used for settling treatment of the post-spinning liquid, and the connecting pipeline should ensure that the post-spinning liquid can flow into the settler 6 stably, and the installation of the settler 6 should consider the settling effect and the convenience of connection of the subsequent treatment process.

[0033] The connecting pipeline between the settler 6 and the post-spinning liquid tank 5 is provided with a flow adjusting device, which is used for adjusting the flow of the post-spinning liquid flowing into the settler 6, and the flow adjusting device is installed at a position easy to operate on the pipeline, and can accurately control the flow size.

[0034] The overflow port of the thickener 7 is connected with an external by-product brine recovery system through a pipeline, and is used for recovering the overflow clear liquid on the upper part of the thickener 7 as by-product brine to a brine mixing process, and the connection of the pipeline should ensure that the overflow clear liquid can be smoothly discharged and transported to a designated position, and the connection is good in sealing property and prevents leakage. The bottom of the area receiving the post-spinning liquid in the post-spinning liquid tank 5 is provided with a liquid discharge port, which is connected with an external post-spinning liquid treatment system through a pipeline, and is used for transporting the post-spinning liquid in the area to a subsequent treatment link, and the position of the liquid discharge port and the pipeline connection mode should ensure that the post-spinning liquid can be completely discharged and does not affect the normal operation of the device.

[0035] A conveying pump is arranged on the connecting pipeline between the thickener 7 and the post-spinning liquid tank 5, and is used for conveying the post-spinning liquid from the post-spinning liquid tank 5 to the thickener 7, and the installation position of the conveying pump should be convenient for operation and maintenance, and can provide sufficient power to ensure stable conveying of the post-spinning liquid.

[0036] Please refer to Figure 3 The brine after salt making is mixed with the carnallite mother liquor and by-product brine generated in the system, and the mixed brine is discharged, and the clear liquid is evaporated and concentrated in an evaporation system, and the completed liquid is separated after heat preservation, and the liquid phase is cooled and crystallized to precipitate carnallite (KCl·MgCl·6H2O), and the carnallite is decomposed by adding water and washed, and finally the finished product potassium chloride is obtained

[0037] Working principle: The coarse potassium raw material first enters the coarse potassium centrifuge 1, and under the action of high-speed rotation of the coarse potassium centrifuge 1, the coarse potassium product and the post-spinning liquid are separated. The coarse potassium product is thrown to the edge of the centrifuge under the action of centrifugal force, and is conveyed to the coarse potassium tank 3 for temporary storage through the pipeline connected with the coarse potassium centrifuge 1.

[0038] The fine potassium raw material enters the fine potassium centrifuge 2, and for the same reason, the fine potassium product is separated from the post-spinning liquid under the action of centrifugal force, and is conveyed to the fine potassium tank 4 for storage through a pipeline.

[0039] The centrifuged liquid of the coarse potassium centrifuge 1 flows into a separate area of the post-throw liquid tank 5 through a special output pipe. The centrifuged liquid of the fine potassium centrifuge 2 flows into another separate area of the post-throw liquid tank 5 through a corresponding output pipe. In this way, the post-throw liquid of the coarse potassium and the fine potassium is separated and stored, avoiding the adverse effects of mixing on subsequent recovery and processing.

[0040] The post-throw liquid in the post-throw liquid area of the post-throw liquid tank 5 flows into the thickener 7 through a conveying pipe under the action of a pump or gravity if there is a height difference. In the thickener 7, the solid phase and the liquid phase in the post-throw liquid are separated, the solid phase gradually precipitates at the bottom of the thickener 7, and the supernatant at the upper part forms an overflow.

[0041] The solid phase potassium chloride at the bottom of the thickener 7 flows into the fine potassium slurry tank 8 through a pipe, is further temporarily stored in the fine potassium slurry tank 8, and is then conveyed to the fine potassium centrifuge 2 through a pipe for dewatering treatment, and finally the recovered finished product potassium chloride is obtained.

[0042] The overflow supernatant at the upper part of the thickener 7 is connected to an external by-product brine recovery system through a pipe, and is returned to the brine mixing process for recycling.

[0043] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A device for recovering refined potassium in a potassium chloride production process, characterized in that, include A crude potassium centrifuge (1) is provided with a crude potassium tank (3) connected to its lower part. A refined potassium centrifuge (2) is provided with a side connected to the crude potassium tank (3). A refined potassium tank (4) is provided with a side connected to the refined potassium centrifuge (2). The post-splashing liquid tank (5) is provided with a partition in the middle. The post-splashing liquid tank (5) is divided into two independent areas by the partition. The two independent areas are respectively connected to the crude potassium centrifuge (1) and the refined potassium centrifuge (2) through pipes. A settling device (6) is provided on the other side of the post-splashing liquid tank (5). A thickener (7) and a potassium slurry tank (8) are provided between the potassium slurry tank (4) and the post-spinning liquid tank (5).

2. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 1, characterized in that: The crude potassium centrifuge (1) has crude potassium raw material as its internal input, and the crude potassium tank (3) is connected to the crude potassium product output end of the crude potassium centrifuge (1) through a pipe.

3. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 1, characterized in that: The output pipe of the centrifuged liquid after centrifugation by the crude potassium centrifuge (1) is connected to an independent area of ​​the centrifuged liquid tank (5).

4. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 1, characterized in that: The internal input of the potassium centrifuge (2) is potassium raw material, and the potassium refiner tank (4) is connected to the potassium refiner product output end of the crude potassium tank (3) through a pipe.

5. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 1, characterized in that: The output pipe of the centrifuged liquid after centrifugation by the potassium centrifuge (2) is connected to another independent area of ​​the centrifuged liquid tank (5).

6. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 5, characterized in that: The thickener (7) is installed on one side of the post-spraying tank (5), and the thickener (7) is connected to the downstream of the potassium post-spraying area of ​​the post-spraying tank (5) through a conveying pipe.

7. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 6, characterized in that: The potassium slurry tank (8) is connected to the thickener (7). The potassium slurry tank (8) is installed below the thickener (7) and is connected to the cone bottom of the thickener (7) through a pipe.

8. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 3, characterized in that: The settling device (6) is installed on one side of the post-spinning liquid tank (5), and the settling device (6) is connected to the downstream area of ​​the post-spinning liquid tank (5) for collecting crude potassium post-spinning liquid through a pipe.

9. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 7, characterized in that: The overflow port of the thickener (7) is connected to an external byproduct brine recovery system via a pipe.

10. The apparatus for recovering refined potassium in a potassium chloride production process as described in claim 8, characterized in that: The bottom of the crude potassium waste liquid receiving area in the waste liquid tank (5) is provided with a drain port.

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