Monopotassium phosphate crystal purification system

Abstract

The utility model discloses a monopotassium phosphate crystal purification system, and belongs to the technical field of monopotassium phosphate production, the monopotassium phosphate crystal purification system comprises a feeding unit, a dissolution reaction kettle, a filter, a crystallizer and a centrifugal machine, the bottom of the dissolution reaction kettle is provided with a pump body, and the pump body is connected with a press filter through a pipeline I; a liquid discharge pipe of the press filter is connected with the filter through a pipeline II, a pipeline III is arranged on the pipeline I, and monopotassium phosphate powder is conveyed into the dissolving reaction kettle through the feeding unit to be dissolved to obtain a monopotassium phosphate solution; according to the type of impurities contained in the monopotassium phosphate solution, the monopotassium phosphate solution is conveyed into a press filter or a filter through a pump body as required, the filtered monopotassium phosphate solution enters a crystallizer to be cooled and crystallized to obtain a monopotassium phosphate solution in a solid solution state, and the monopotassium phosphate solution in the solid solution state enters a centrifugal machine to be centrifuged to remove mother liquor. And the processing efficiency can be ensured while the purification effect of the monopotassium phosphate solution is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of potassium dihydrogen phosphate production, and specifically to a purification system for potassium dihydrogen phosphate crystals. Background Technique

[0002] Potassium dihydrogen phosphate is an inorganic compound with the chemical formula KH2PO4. It has deliquescence. When heated to 400 °C, it melts into a transparent liquid and solidifies into an opaque glassy metaphosphate potassium after cooling. It is stable in air, soluble in water and insoluble in ethanol. Industrially, it is used as a buffer and culture medium, as well as a flavoring agent for synthesizing sake in bacterial culture, a raw material for preparing metaphosphate potassium, a culture medium, fortifier, leavening agent, and fermentation aid for brewing yeast. Agriculturally, it is used as a highly efficient phosphorus and potassium compound fertilizer. The higher the purity of potassium dihydrogen phosphate, the larger the crystals that can grow. For example, when making lenses, it means that the lenses made can be larger, so that more light beams can pass through per unit time. After the light beams pass through the crystal lens, a sudden change can occur, and it can be heated up, which is the traditional laser. Therefore, the purity of potassium dihydrogen phosphate is very important. The powder purification of potassium dihydrogen phosphate crystals is to effectively control the free metal ions in potassium dihydrogen phosphate, including other impurities, below 0.02 ppm, so as to make the growth of crystals controllable, make the crystals pure and the physical properties fixed.

[0003] For example, the Chinese utility model patent with the publication number CN202829585U discloses a purification system for potassium dihydrogen phosphate, which includes a dissolution reaction kettle, a filtering device, a cooling tank and a centrifugal water removal device. The potassium dihydrogen phosphate powder is dissolved in the dissolution reaction kettle and then flows into the filtering device. After passing through the filtering device, the potassium dihydrogen phosphate solution enters the cooling tank to obtain a potassium dihydrogen phosphate solution in a solid solution state, and the potassium dihydrogen phosphate solution in the solid solution state enters the centrifugal water removal device for centrifugal water removal.

[0004] The above solution has the following deficiencies in actual use:

[0005] This solution uses a dissolution reaction kettle, a filtering device, a cooling tank and a centrifugal water removal device to purify potassium dihydrogen phosphate. However, in actual use, the structure is too simple. When there are many impurities in the potassium dihydrogen phosphate powder, it is easy to block the filtering device, resulting in poor filtering effect, and there are many impurities during cooling crystallization, resulting in less than ideal purification. Summary of the Invention

[0006] The purpose of the present invention is to provide a purification system for potassium dihydrogen phosphate crystals to solve the problems raised in the above background technique.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A potassium dihydrogen phosphate crystal purification system includes a feeding unit, a dissolution reaction kettle, a filter, a crystallizer and a centrifuge. A pump body for transporting the potassium dihydrogen phosphate solution is arranged at the bottom of the dissolution reaction kettle. The pump body is connected with a pressure filter through a pipeline 1. The drain pipe of the pressure filter is connected with the filter through a pipeline 2. A pipeline 3 for connecting the filter is arranged on the pipeline 1. The potassium dihydrogen phosphate powder is transported into the dissolution reaction kettle by the feeding unit for dissolution to obtain a potassium dihydrogen phosphate solution. According to the types of impurities contained in the potassium dihydrogen phosphate solution, it is transported to the pressure filter or the filter through the pump body as needed. The filtered potassium dihydrogen phosphate solution enters the crystallizer for cooling crystallization to obtain a potassium dihydrogen phosphate solution in a solid solution state. The potassium dihydrogen phosphate solution in the solid solution state enters the centrifuge to centrifugally remove the mother liquor.

[0009] Preferably, the feeding unit includes a storage tank. A screw feeder is arranged at the bottom of the storage tank. The discharge end of the screw feeder is connected with the dissolution reaction kettle.

[0010] Preferably, a backwashing unit is arranged on one side of the filter.

[0011] Preferably, the potassium dihydrogen phosphate solution filtered by the pressure filter is transported to the filter through the pipeline 3.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The potassium dihydrogen phosphate powder is transported into the dissolution reaction kettle by the feeding unit for dissolution to obtain a potassium dihydrogen phosphate solution. According to the types of impurities contained in the potassium dihydrogen phosphate solution, it is transported to the pressure filter or the filter through the pump body as needed. The filtered potassium dihydrogen phosphate solution enters the crystallizer for cooling crystallization to obtain a potassium dihydrogen phosphate solution in a solid solution state. The potassium dihydrogen phosphate solution in the solid solution state enters the centrifuge to centrifugally remove the mother liquor. It can selectively inject the potassium dihydrogen phosphate solution into the pressure filter or the filter according to the amount of impurities contained in the potassium dihydrogen phosphate solution, and can ensure both the purification effect of the potassium dihydrogen phosphate solution and the processing efficiency. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the whole of the present invention.

[0015] In the figure:

[0016] 1. Storage tank; 2. Screw feeder; 3. Dissolution reaction kettle; 4. Pump body; 5. Pipeline 1; 6. Pressure filter; 7. Drain pipe; 8. Pipeline 2; 9. Pipeline 3; 10. Filter; 11. Pipeline 4; 12. Crystallizer; 13. Centrifuge; 14. Backwashing unit. Detailed Embodiments

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1 , the present invention provides a technical solution:

[0019] A potassium dihydrogen phosphate crystal purification system includes a feeding unit, a dissolution reaction kettle 3, a filter 10, a crystallizer 12 and a centrifuge 13. A pump body 4 for conveying a potassium dihydrogen phosphate solution is arranged at the bottom of the dissolution reaction kettle 3. The pump body 4 is connected to a pressure filter 6 through a pipeline 1 5. The drain pipe 7 of the pressure filter 6 is connected to the filter 10 through a pipeline 2 8. A pipeline 3 9 for connecting the filter 10 is arranged on the pipeline 1 5. The potassium dihydrogen phosphate powder is conveyed into the dissolution reaction kettle 3 by the feeding unit for dissolution to obtain a potassium dihydrogen phosphate solution. According to the types of impurities contained in the potassium dihydrogen phosphate solution, it is conveyed to the pressure filter 6 or the filter 10 through the pump body 4 as required. The filtered potassium dihydrogen phosphate solution enters the crystallizer 12 for cooling crystallization to obtain a potassium dihydrogen phosphate solution in a solid solution state. The potassium dihydrogen phosphate solution in the solid solution state enters the centrifuge 13 to centrifugally remove the mother liquor.

[0020] It should be noted that valves for controlling the flow of the potassium dihydrogen phosphate solution are arranged on both the pipeline 1 5 and the pipeline 3 9. According to the types of impurities contained in the potassium dihydrogen phosphate solution, it is conveyed to the pressure filter or the filter through the pump body as required. When there are more impurities in the potassium dihydrogen phosphate solution, the potassium dihydrogen phosphate solution is injected into the pressure filter 6 through the pipeline 1 5. After the pressure filter 6 filters the potassium dihydrogen phosphate solution, the potassium dihydrogen phosphate solution is injected into the filter 10 through the pipeline 2 8 for secondary filtration; when there are fewer impurities in the potassium dihydrogen phosphate solution, the potassium dihydrogen phosphate solution is injected into the filter 10 through the pipeline 1 5 and the pipeline 3 9 for filtration.

[0021] The feeding unit includes a storage tank 1. A screw feeder 2 is arranged at the bottom of the storage tank 1. The discharge end of the screw feeder 2 is connected to the dissolution reaction kettle 3.

[0022] On one side of the filter 10, a backwashing unit 14 is provided. Among them, the backwashing unit 14 includes a backwashing pump: providing the pressure and flow rate required for backwashing, delivering clean water or other flushing media into the filter to strongly flush the filter media and remove impurities; a backwashing inlet valve: controlling the passage for the flushing media to enter the filter, opening during backwashing to allow the flushing water to enter; a backwashing drain valve: opening during the backwashing process to discharge the flushing water with impurities from the filter; a switching valve: used to switch between the normal filtration and backwashing modes to ensure that the system can operate stably under different working conditions; a controller: which can be an electronic controller or a mechanical controller, used to set parameters such as the time, frequency, and triggering conditions of backwashing, automatically controlling the start and stop of the backwashing process to achieve efficient filtration and backwashing operations; pipelines: connecting the backwashing pump, valves, and the filter to ensure that the flushing media can flow smoothly in the system; joints and connectors: used to fix and seal the pipelines, ensuring the tightness of the system and preventing leakage; a pressure sensor: monitoring the pressure change inside the filter, triggering the backwashing operation when the pressure reaches the set value; a flow sensor: which can monitor the flow rate during the backwashing process to ensure that the backwashing effect meets the requirements; a filter housing: providing support and protection for the backwasher, and at the same time accommodating the filter element and the backwashing mechanism; seals to ensure that the filter does not leak during the backwashing process, guaranteeing the tightness and stability of the system.

[0023] The potassium dihydrogen phosphate solution filtered by the pressure filter 6 is transported to the filter 10 through pipeline three 9.

[0024] The working process of this embodiment is as follows: The potassium dihydrogen phosphate powder is transported to the dissolution reactor 3 through the feeding unit for dissolution to obtain a potassium dihydrogen phosphate solution. According to the types of impurities contained in the potassium dihydrogen phosphate solution, it is transported to the pressure filter 6 or the filter 10 through the pump body 4 as needed. When there are more impurities in the potassium dihydrogen phosphate solution, the potassium dihydrogen phosphate solution is injected into the pressure filter 6 through pipeline one 5. After the pressure filter 6 filters the potassium dihydrogen phosphate solution, the potassium dihydrogen phosphate solution is injected into the filter 10 through pipeline two 8 for secondary filtration; when there are fewer impurities in the potassium dihydrogen phosphate solution, the potassium dihydrogen phosphate solution is injected into the filter 10 through pipeline one 5 and pipeline three 9 for filtration;

[0025] The filtered potassium dihydrogen phosphate solution enters the crystallizer 12 for cooling crystallization to obtain a potassium dihydrogen phosphate solution in a solid solution state, and the potassium dihydrogen phosphate solution in the solid solution state enters the centrifuge 13 to centrifugally remove the mother liquor.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A potassium dihydrogen phosphate crystal purification system, comprising a feeding unit, a dissolution reactor, a filter, a crystallizer and a centrifuge, characterized in that, A pump body for conveying potassium dihydrogen phosphate solution is provided at the bottom of the dissolution reactor. The pump body is connected to a pressure filter through Pipeline 1. The drain pipe of the pressure filter is connected to a filter through Pipeline 2. A Pipeline 3 for connecting the filter is provided on Pipeline 1. The potassium dihydrogen phosphate powder is conveyed into the dissolution reactor by the feeding unit for dissolution to obtain potassium dihydrogen phosphate solution. According to the types of impurities contained in the potassium dihydrogen phosphate solution, it is conveyed to the pressure filter or the filter through the pump body as needed. The filtered potassium dihydrogen phosphate solution enters the crystallizer for cooling crystallization to obtain potassium dihydrogen phosphate solution in a solid solution state. The potassium dihydrogen phosphate solution in the solid solution state enters a centrifuge to centrifugally remove the mother liquor.

2. The purification system of potassium dihydrogen phosphate crystal according to claim 1, wherein The feeding unit includes a storage tank. A screw feeder is provided at the bottom of the storage tank. The discharge end of the screw feeder is connected to the dissolution reactor.

3. A potassium dihydrogen phosphate crystal purification system according to claim 1, wherein, A backwashing unit is provided on one side of the filter.

4. The purification system for potassium dihydrogen phosphate crystals according to claim 1, wherein The potassium dihydrogen phosphate solution filtered by the pressure filter is conveyed to the filter through Pipeline 3.

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