Activated carbon filtering device in monopotassium phosphate production

Abstract

The utility model belongs to the technical field of monopotassium phosphate production, and discloses an activated carbon filtering device in monopotassium phosphate production, which comprises a stirring tank, the stirring tank is communicated to a vacuum belt filter through a material conveying pipeline, a material conveying pump and a material distributor, and a vacuum liquid collecting tank is arranged below filter cloth at the top of the vacuum belt filter. The bottom of the vacuum liquid collecting tank is communicated with a plurality of uniformly distributed vacuum liquid conveying pipes, the vacuum liquid conveying pipes are converged into a vacuum pipe to be communicated to a vacuum tank, the bottom of the vacuum tank is provided with a discharge port, and the discharge port is communicated to a feed liquid collecting tank through a discharge pipe and a discharge pump; a gas outlet is formed in the top of the vacuum tank and is communicated with a tail gas treatment device through a gas outlet pipe and a vacuum pump; and a liquid level meter is arranged on a tank body on one side of the vacuum tank. According to the utility model, the discharging process can be automatically controlled, so that the discharging is more stable; and continuous production can be realized, the productivity is increased, energy is saved, consumption is reduced, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of potassium dihydrogen phosphate production, and particularly relates to an activated carbon filtering device in potassium dihydrogen phosphate production. Background Art

[0002] Corn steep water is a waste product produced during the wet process of corn starch production, containing 1-2% phytic acid by weight. Phytic acid is recovered from this water to produce potassium phytate, which is then hydrolyzed to produce inositol and potassium dihydrogen phosphate. Because corn steep water contains a high content of organic impurities—in addition to phytic acid, it also contains proteins, starch, lactic acid, and sugars—some of these impurities are introduced into the potassium phytate solution during the production process. This leads to browning during hydrolysis, darkening the hydrolyzate and affecting the color of the potassium dihydrogen phosphate product. The current process for producing potassium dihydrogen phosphate from corn steep water primarily involves phytic acid adsorption, desorption, potassium phytate concentration, potassium phytate hydrolysis, decolorization of the hydrolyzate, chromatographic separation, concentration, decolorization of the concentrate, cooling and crystallization, and centrifugal drying. Decolorization is often performed using powdered activated carbon, which requires a large amount of activated carbon and results in a large amount of activated carbon to be processed later. Plate and frame filtration is currently a common method, but plate and frame filtration cannot achieve continuous production and still suffers from high labor intensity, low production capacity, and high energy consumption. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an activated carbon filtering device for potassium dihydrogen phosphate production, which can automatically control the discharging process to make the discharging more stable; and can also realize continuous production, increase production capacity, save energy and reduce consumption, and reduce labor intensity.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] An activated carbon filtration device for potassium dihydrogen phosphate production comprises a stirring tank, which is connected to a vacuum belt filter through a feeding pipe, a feeding pump and a distributor; a vacuum liquid collecting tank is provided under the filter cloth on the top of the vacuum belt filter; a plurality of evenly distributed vacuum liquid infusion pipes are connected to the bottom of the vacuum liquid collecting tank, and the vacuum liquid infusion pipes are gathered into a vacuum pipe and connected to a vacuum tank; a discharge port is provided at the bottom of the vacuum tank, and the discharge port is connected to a liquid collection tank through a discharge pipe and a discharge pump; an air outlet is provided at the top of the vacuum tank, and the air outlet is connected to an exhaust gas treatment device through an air outlet pipe and a vacuum pump; and a liquid level gauge is provided on one side of the tank body of the vacuum tank.

[0006] Preferably, the distributor is arranged at one end of the top of the vacuum belt filter, a scraper is provided at the other end of the top of the vacuum belt filter, and a filter cake collection tank is provided under the scraper; the vacuum belt filter is provided with a flushing device at the lower part of the scraper end, and a sewage collection tank is provided at the lower part of the flushing device, and the sewage collection tank is connected to the sewage treatment system through a pipeline.

[0007] Furthermore, the filter cake collecting tank is connected to a dryer through a conveying device to dry the filter cake (activated carbon).

[0008] Preferably, the vacuum belt filter is further provided with a driving device, a deviation correcting device and a filter cloth tensioning device.

[0009] Preferably, the model of the vacuum belt filter is PBF-1250, and the manufacturer is: Zhejiang Hexing Machinery Manufacturing Co., Ltd.

[0010] Preferably, the liquid level meter is interlocked with the discharge pump and the vacuum pump to ensure the vacuum degree in the vacuum tank and realize the automatic discharge of the liquid in the vacuum tank.

[0011] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0012] This utility model uses a distributor to apply a potassium dihydrogen phosphate solution mixed with activated carbon to the filter cloth of a vacuum belt filter. The activated carbon and liquid are then separated by vacuum filtration. The collected filter cake is then dried in a dryer. The collected liquid is then automatically discharged into a liquid collection tank for post-processing. This device automatically controls the discharge process, making it more stable. It also enables continuous production, increasing production capacity, saving energy and reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] In the figure, 1. mixing tank; 2. feed pump; 3. distributor; 4. vacuum belt filter; 41. vacuum liquid collecting tank; 42. vacuum liquid infusion pipe; 43. vacuum pipe; 5. vacuum tank; 6. discharge pump; 7. liquid collection tank; 8. vacuum pump; 9. liquid level gauge; 10. scraper; 11. filter cake collection tank; 12. flushing device; 13. sewage collection tank. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Example 1:

[0017] like Figure 1As shown, an activated carbon filtration device for potassium dihydrogen phosphate production includes a stirring tank 1, which is connected to a vacuum belt filter 4 through a feeding pipe (not marked), a feeding pump 2 and a distributor 3. A vacuum liquid collecting tank 41 is provided under the filter cloth on the top of the vacuum belt filter 4, and a plurality of evenly distributed vacuum liquid infusion pipes 42 are connected to the bottom of the vacuum liquid collecting tank 41. The vacuum liquid infusion pipes 42 are gathered into a vacuum pipe 43 and connected to a vacuum tank 5; a discharge port (not marked) is provided at the bottom of the vacuum tank 5, and the discharge port is connected to a liquid collection tank 7 through a discharge pipe (not marked) and a discharge pump 6; an air outlet (not marked) is provided at the top of the vacuum tank 5, and the air outlet is connected to an exhaust gas treatment device (not marked) through an air outlet pipe (not marked) and a vacuum pump 8; a liquid level gauge 9 is provided on one side of the tank body of the vacuum tank 5.

[0018] The distributor 3 is arranged at one end of the top of the vacuum belt filter 4, and a scraper 10 is provided at the other end of the top of the vacuum belt filter 4, and a filter cake collecting tank 11 is provided below the scraper 10; a flushing device 12 is provided at the lower part of the end of the vacuum belt filter 4 where the scraper 10 is provided, and a sewage collecting tank 13 is provided at the lower part of the flushing device 12, and the sewage collecting tank 13 is connected to the sewage treatment system (not marked) through a pipeline.

[0019] In actual use, the activated carbon is added to the potassium dihydrogen phosphate liquid in the stirring tank 1. After being fully mixed, it is transported to the vacuum belt filter 4 through the feed pump 2 and the distributor 3. The vacuum system is turned on for filtration. The activated carbon-containing liquid is evenly coated on the filter cloth through the distributor 3. Under the action of vacuum, the liquid is first collected in the vacuum collecting tank 41, and then collected into the vacuum pipe 43 by the vacuum infusion pipe 42 at the bottom of the vacuum collecting tank 41. It flows into the vacuum tank 5 along the vacuum pipe 43. When the liquid level in the vacuum tank 5 reaches a certain height, the level gauge 9 interlocks to open the discharge pump 6, and the liquid is transported to the liquid collection tank 7. When the liquid level is lower than the set level, the discharge pump 6 is closed to keep the vacuum in the vacuum tank 5 from leaking. Through the above settings, the filtration and separation of activated carbon can be continuously operated, thereby greatly improving production efficiency and production capacity and reducing the intensity of manual production.

[0020] It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. An activated carbon filtration device for potassium dihydrogen phosphate production, characterized in that: It includes a stirring tank, which is connected to a vacuum belt filter through a feeding pipe, a feeding pump and a distributor. A vacuum liquid collecting tank is provided under the filter cloth on the top of the vacuum belt filter. The bottom of the vacuum liquid collecting tank is connected to a number of evenly distributed vacuum infusion pipes, which are gathered into a vacuum pipe and connected to a vacuum tank; a discharge port is provided at the bottom of the vacuum tank, which is connected to a liquid collection tank through a discharge pipe and a discharge pump; an air outlet is provided at the top of the vacuum tank, which is connected to an exhaust gas treatment device through an air outlet pipe and a vacuum pump; a liquid level gauge is provided on one side of the tank body of the vacuum tank.

2. The activated carbon filtration device for potassium dihydrogen phosphate production according to claim 1, wherein: The distributor is arranged at one end of the top of the vacuum belt filter, and a scraper is provided at the other end of the top of the vacuum belt filter, and a filter cake collection tank is provided under the scraper; the vacuum belt filter is provided with a flushing device at the lower part of the scraper end, and a sewage collection tank is provided at the lower part of the flushing device, and the sewage collection tank is connected to the sewage treatment system through a pipeline.

3. The activated carbon filtration device for potassium dihydrogen phosphate production according to claim 2, wherein: The filter cake collecting tank is connected to the dryer through a conveying device.

4. The activated carbon filtration device for potassium dihydrogen phosphate production according to claim 1, wherein: The vacuum belt filter is also provided with a driving device, a deviation correcting device and a filter cloth tensioning device.

5. The activated carbon filtration device for potassium dihydrogen phosphate production according to claim 1, wherein: The liquid level meter is interlocked with the discharge pump and the vacuum pump for control.

Images