Device for preparing compound fertilizer from mother liquor of potassium nitrate production

Abstract

The utility model belongs to chemical equipment technical field discloses a device of compound fertilizer is prepared to potassium nitrate production mother liquor, including mother liquor storage tank, mother liquor storage tank is communicated to concentration device, mixing device, granulating device, drying device, cooling device, screening device, coating device and packaging device in proper order through pipeline, pump and valve, the feed port of mixing device still communicates to monoammonium phosphate storage tank and urea storage tank respectively through pipeline, pump and valve. The utility model prepares the mother liquor produced in the production process into compound fertilizer, reduces waste liquid treatment pressure, increases economic benefits.

Description

Technical Field

[0001] This utility model belongs to the field of chemical equipment technology, specifically relating to an apparatus for preparing compound fertilizer from potassium nitrate production mother liquor. Background Technology

[0002] Potassium nitrate is an important chemical raw material, widely used in industrial production in food, pharmaceuticals, glass, ceramics, and explosives, as well as as a fertilizer in agriculture. Currently, the main method for producing potassium nitrate in China is the ammonium nitrate-potassium chloride metathesis process. The resulting mother liquor mainly contains KNO3, NH4NO3, and trace amounts of Ca / Mg. Directly treating this mother liquor as wastewater puts pressure on wastewater treatment and results in significant waste. Therefore, it is necessary to recover and reuse the components of the mother liquor to maximize economic benefits. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide an apparatus for preparing compound fertilizer from potassium nitrate production mother liquor, which prepares compound fertilizer from the mother liquor generated during the production process, reduces the pressure of waste liquid treatment, and increases economic benefits.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] An apparatus for preparing compound fertilizer from potassium nitrate production mother liquor includes a mother liquor storage tank, which is sequentially connected to a concentration device, a mixing device, a granulation device, a drying device, a cooling device, a screening device, a coating device, and a packaging device via pipes, pumps, and valves (the outlet of the former is connected to the inlet of the latter via pipes, pumps, and valves); the inlet of the mixing device is also connected to a monoammonium phosphate storage tank and a urea storage tank via pipes, pumps, and valves respectively.

[0006] Preferably, the mother liquor storage tank is a neutralization tank, equipped with a stirring device and a metering pump. The metering pump at the inlet is connected to the mother liquor input pipeline, the acid adjustment input pipeline, and the alkali adjustment input pipeline, respectively, for adjusting the pH of the mother liquor.

[0007] Preferably, the concentration device is a triple-effect evaporator. (Jiangsu Ruida Environmental Protection Technology Co., Ltd.)

[0008] Preferably, the mixing device is a twin-shaft paddle mixer. Model SLHY-2.5, manufactured by Shandong Tiangong Machinery Co., Ltd.

[0009] Preferably, the granulation device is a rotary drum granulator, model GZ-3.2, manufactured by Jiangsu Boji Environmental Protection Technology Co., Ltd.

[0010] Preferably, the drying device is a rotary dryer. Model Φ1.5×12m, manufactured by Henan Yuhui Mining Machinery Co., Ltd.

[0011] Preferably, the cooling device is a fluidized bed cooler, model LQ-6, manufactured by Changzhou Xianfeng Drying Equipment Co., Ltd.

[0012] Preferably, the screening device is a vibrating screen, model ZS-800, manufactured by Xinxiang Dahan Vibration Machinery Co., Ltd.

[0013] Preferably, the coating device is a roller coating machine. BM series, Weihui Hongda Machinery Factory.

[0014] Preferably, the packaging device is an automatic packaging machine, model DCS-50, manufactured by Shanghai Yingheng Automation Equipment Co., Ltd.

[0015] Due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] This invention utilizes the KNO3, NH4NO3, trace amounts of Ca / Mg, and other components contained in the mother liquor. By adding appropriate amounts of monoammonium phosphate and urea, a compound fertilizer rich in nitrogen, phosphorus, and potassium can be prepared for agricultural production, effectively reusing the waste liquid.

[0017] In summary, this invention prepares the mother liquor generated during the production process into compound fertilizer, reducing the pressure of waste liquid treatment and increasing economic benefits. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model;

[0020] The components include: 1. Mother liquor storage tank; 2. Concentration device; 3. Mixing device; 4. Granulation device; 5. Drying device; 6. Cooling device; 7. Screening device; 8. Coating device; 9. Packaging device; 10. Monoammonium phosphate storage tank; and 11. Urea storage tank. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, this utility model is an apparatus for preparing compound fertilizer from potassium nitrate production mother liquor, including a mother liquor storage tank 1. The mother liquor storage tank 1 is connected in sequence to a concentration device 2, a mixing device 3, a granulation device 4, a drying device 5, a cooling device 6, a screening device 7, a coating device 8, and a packaging device 9 via pipes (not shown), pumps (not shown), and valves (not shown). The feed inlet of the mixing device 3 is also connected to a monoammonium phosphate storage tank 10 and a urea storage tank 11 via pipes, pumps, and valves, respectively.

[0023] In actual production, the mother liquor produced during potassium nitrate production is first transferred to mother liquor storage tank 1. The pH of the mother liquor is monitored to determine whether neutralization is necessary. If the pH is outside the range of 5.5-6.5, it is adjusted by introducing appropriate acid or alkali solutions. The pH-adjusted mother liquor is then transferred to concentration unit 2 for triple-effect evaporation. The first effect temperature is 80-90℃, and the vacuum degree is -0.05MPa. The final effect temperature is 50-60℃, concentrating the liquor to a solid content of 40%-50%. Finally, the mother liquor is transferred to mixing unit 3, where the concentrations of various components are monitored. After determining the component content, add appropriate amounts of monoammonium phosphate and urea solid raw materials according to the ratio. After stirring and mixing, the mixture is sent to granulation device 4 for granulation (slurry spraying granulation at a material temperature of 70-80℃). Then, it passes through drying device 5 (drying at a temperature of 100-120℃), cooling device 6 (to a temperature below 40℃), and screening device 7 (particle size of 2-4mm is considered qualified) to obtain uniform compound fertilizer granules. After film treatment by coating device 8 (using mineral oil coating), the finished compound fertilizer is obtained. After packaging, it can be stored and transported.

[0024] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. An apparatus for preparing compound fertilizer from potassium nitrate production mother liquor, characterized in that: It includes a mother liquor storage tank, which is connected in sequence to a concentration device, a mixing device, a granulation device, a drying device, a cooling device, a screening device, a coating device, and a packaging device via pipes, pumps, and valves; the inlet of the mixing device is also connected to a monoammonium phosphate storage tank and a urea storage tank via pipes, pumps, and valves respectively.

2. The apparatus for preparing compound fertilizer from potassium nitrate production mother liquor as described in claim 1, characterized in that: The mother liquor storage tank is a neutralization tank, equipped with a stirring device and a metering pump.

3. The apparatus for preparing compound fertilizer from potassium nitrate production mother liquor as described in claim 1, characterized in that: The concentration device is a triple-effect evaporator; the mixing device is a twin-shaft paddle mixer.

4. The apparatus for preparing compound fertilizer from potassium nitrate production mother liquor as described in claim 1, characterized in that: The granulation device is a rotary drum granulator; the drying device is a rotary dryer.

5. The apparatus for preparing compound fertilizer from potassium nitrate production mother liquor as described in claim 1, characterized in that: The cooling device is a fluidized bed cooler; the screening device is a vibrating screen.

6. The apparatus for preparing compound fertilizer from potassium nitrate production mother liquor as described in claim 1, characterized in that: The wrapping device is a roller wrapping machine; the packaging device is an automatic packaging machine.

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