Device for producing anhydrous trisodium phosphate

Abstract

The utility model relates to anhydrous trisodium phosphate preparation device technical field especially anhydrous trisodium phosphate production device, anhydrous trisodium phosphate production device, including raw material tank, heater and separation tower that connect through pipeline sequentially, the raw material tank is connected for the feeding pump of raw material delivery heater, be equipped with circulating pump between heater and separation tower for the raw material of pumping into separation tower and carry out gas -liquid separation after heating, heater and separation tower between still be equipped with bypass, this bypass intercommunication centrifuge and be equipped with discharge valve and discharge pump, the centrifuge connects mother liquor tank, and mother liquor tank passes through mother liquor pump and is communicated with separation tower, forms mother liquor circulation path, discharges the excessive standard impurity in the mother liquor through the detection and controls product purity when continuous production.

Description

Technical Field

[0001] This utility model relates to the technical field of anhydrous trisodium phosphate preparation apparatus, and in particular to an anhydrous trisodium phosphate production apparatus. Background Technology

[0002] In chemical production, trisodium phosphate is mainly produced by cooling crystallization. This method yields trisodium phosphate dodecahydrate with twelve molecules of water of crystallization. However, the subsequent production of lithium iron phosphate or lithium manganese iron phosphate requires anhydrous trisodium phosphate, necessitating a process to remove the water of crystallization. Traditionally, this process involves high-temperature drying, which is not only energy-intensive and inefficient but also prone to caking and difficult to clean, further increasing the production difficulty. Therefore, there is an urgent need to find a more economical and efficient production process. Utility Model Content

[0003] To overcome the problems of high energy consumption and difficult-to-clean caking in existing technologies, this invention provides an anhydrous trisodium phosphate production device. By constructing a series pipeline of raw material tank-heater-separation tower, connecting a bypass centrifuge system and a closed-loop circulation path of mother liquor, and triggering centrifugation operation based on solid content threshold, it achieves simultaneous operation of continuous production, high-purity product control and efficient crystallization, and completely solves the problems of high energy consumption and difficult-to-clean caking.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an anhydrous trisodium phosphate production device, including a raw material tank, a heater, and a separation tower connected in sequence by pipelines; the raw material tank is connected to a feeding pump for conveying raw materials to the heater; a circulation pump is provided between the heater and the separation tower for pumping the heated raw materials into the separation tower for gas-liquid separation; a bypass is also provided between the heater and the separation tower, which is connected to a centrifuge and is equipped with a discharge valve and a discharge pump; the centrifuge is connected to a mother liquor tank, which is connected to the separation tower through a mother liquor pump to form a mother liquor circulation path; during continuous production, the purity of the product is controlled by detecting and discharging excessive impurities in the mother liquor.

[0005] In the above-mentioned anhydrous trisodium phosphate production apparatus, the feed to the raw material tank is a trisodium phosphate solution transported from the upstream process or a solution obtained by redissolving solid trisodium phosphate dodecahydrate.

[0006] In the above-mentioned anhydrous trisodium phosphate production device, the discharge valve is opened when the solid content of trisodium phosphate in the solution is ≥15%.

[0007] In the above-mentioned anhydrous trisodium phosphate production apparatus, the solid content is detected by sampling and observation.

[0008] In the above-mentioned anhydrous trisodium phosphate production apparatus, the solids separated by the centrifuge are directly bagged.

[0009] In the above-mentioned anhydrous trisodium phosphate production apparatus, the raw material tank is located to the left of the heater, and the feed pump is arranged to the right of the raw material tank.

[0010] In the above-mentioned anhydrous trisodium phosphate production apparatus, the bypass branch is led out from the connecting pipe between the heater and the separation tower.

[0011] In the above-mentioned anhydrous trisodium phosphate production apparatus, the number of heaters and separation towers are multiple and connected in series.

[0012] In the above-mentioned anhydrous trisodium phosphate production apparatus, the multiple sets of heaters and separation towers constitute a three-stage concentration unit.

[0013] In the aforementioned anhydrous trisodium phosphate production apparatus, the feed pump sequentially delivers the raw materials to three sets of heaters and separation towers connected in series. Attached Figure Description

[0014] The present invention will be further described below with reference to the embodiments and examples.

[0015] Figure 1 This is a schematic diagram of the process system flow of Example 1.

[0016] Figure 2 This is a schematic diagram of the process system flow of Example 2.

[0017] In the diagram: 1. Raw material tank; 2. Feed pump; 3. Heater; 4. Circulation pump; 5. Separation tower; 6. Discharge valve; 7. Discharge pump; 8. Centrifuge; 9. Mother liquor tank; 10. Mother liquor pump. Detailed Implementation

[0018]

Example 1

[0019] An anhydrous trisodium phosphate production apparatus, such as Figure 1As shown, the production apparatus includes a raw material tank 1, a heater 3, and a separation tower 5 connected sequentially by pipelines. The raw material is a trisodium phosphate solution or a solution obtained by heating and redissolving solid trisodium phosphate dodecahydrate from the upstream process. A feed pump 2 for conveying raw material into the heater 3 is arranged on the right side of the raw material tank 1. A circulation pump 4 for conveying the heated raw material is arranged between the heater 3 and the separation tower 5, so that the heated raw material undergoes continuous gas-liquid separation in the separation tower 5. A bypass connecting the heater 3 and the separation tower 5 is also arranged, which is connected to a centrifuge 8. A discharge valve 6 and a discharge pump 7 are installed at the top of the bypass to allow the trisodium phosphate to precipitate after supersaturation in the solution. Through sampling and observation, if the solid content reaches more than 15%, the discharge valve 6 is opened, and the discharge pump 7 transports the raw material from the heater 3 to the centrifuge 8. A mother liquor tank 9 is also arranged on one side of the centrifuge 8. One end of the mother liquor tank 9 is connected to the centrifuge 8, and the other end of the mother liquor tank 9 is connected to the separation tower 5 through the mother liquor pump 10. Thus, the solids separated from the raw material are bagged by the centrifuge 8, while the centrifugal mother liquor enters the mother liquor tank 9. Then, under the action of the mother liquor pump 10, the centrifugal mother liquor is transported to the separation tower 5 for further separation. During continuous production, the concentration of impurities in the mother liquor needs to be tested regularly. By discharging the mother liquor, the impurities are controlled to not exceed the standard, ensuring the purity of the main product, trisodium phosphate.

[0020]

Example 2

[0021] This embodiment is an optimized version of embodiment 1, such as... Figure 2 As shown, in this production device, there are three sets of heaters 3 and separation towers 5, which are arranged in series so that the feed pump 2 can transport the raw materials in the raw material tank 1 to the three sets of heaters 3 and separation towers 5 arranged in series for three-stage concentration. After the trisodium phosphate in the solution is supersaturated and precipitates, the solid content is observed by sampling and it is found to be above 15%. The discharge valve 6 is opened to feed the material to the centrifuge 8. The centrifuge 8 then bags the solids separated from the raw materials, while the centrifugal mother liquor enters the mother liquor tank 9. Then, under the action of the mother liquor pump 10, the centrifugal mother liquor is transported to the separation tower 5 for further separation. During continuous production, the concentration of impurities in the mother liquor needs to be tested regularly. By discharging the mother liquor, the impurities are controlled to not exceed the standard, thus ensuring the purity of the main product, trisodium phosphate.

Claims

1. An apparatus for producing anhydrous trisodium phosphate, characterized in that: The system includes a raw material tank, a heater, and a separation tower connected sequentially by pipelines. The raw material tank is connected to a feed pump for supplying raw materials to the heater. A circulation pump is provided between the heater and the separation tower to pump the heated raw material into the separation tower for gas-liquid separation. A bypass is also provided between the heater and the separation tower, which connects to a centrifuge and is equipped with a discharge valve and a discharge pump. The centrifuge is connected to a mother liquor tank, which is connected to the separation tower via a mother liquor pump, forming a mother liquor circulation path. During continuous production, the purity of the product is controlled by detecting and discharging excessive impurities in the mother liquor.

2. The apparatus for producing anhydrous trisodium phosphate according to claim 1, characterized by: The feed to the raw material tank is a trisodium phosphate solution or a solution obtained by redissolving solid trisodium phosphate dodecahydrate from the upstream process.

3. The anhydrous trisodium phosphate production apparatus according to claim 1, characterized in that: The discharge valve is opened when the trisodium phosphate solid content in the solution is ≥15%.

4. The apparatus for producing anhydrous trisodium phosphate according to claim 3, characterized by: The solid content is detected by sampling and observation.

5. The apparatus for producing anhydrous trisodium phosphate according to claim 1, characterized by: The solids separated by the centrifuge are directly bagged.

6. The apparatus for producing anhydrous trisodium phosphate according to claim 1, characterized by: The raw material tank is located to the left of the heater, and the feeding pump is located to the right of the raw material tank.

7. The apparatus for producing anhydrous trisodium phosphate according to claim 1, characterized by: The bypass branched off from the connecting pipe between the heater and the separation tower.

8. The apparatus for producing anhydrous trisodium phosphate according to any one of claims 1 to 7, characterized by: The heaters and separation towers are in multiple sets and connected in series.

9. The apparatus for producing anhydrous trisodium phosphate according to claim 8, characterized by: The multiple sets of heaters and the separation tower constitute a three-stage concentration unit.

10. The apparatus for producing anhydrous trisodium phosphate according to claim 8, characterized by: The feed pump sequentially delivers the raw materials to three sets of heaters and separation towers connected in series.

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