Defluorination device for fluorine-containing sulfuric acid

Abstract

The utility model provides a fluorine-containing sulfuric acid defluorination device which comprises a fluorine-containing sulfuric acid tank, a steam stripping defluorination tower and a fluorine absorption system which are sequentially connected through a pipeline, the fluorine-containing sulfuric acid tank is connected into a fluorine-containing sulfuric acid liquid pipe, and a high-pressure pump is arranged on the pipeline between the fluorine-containing sulfuric acid tank and the steam stripping defluorination tower. The bottom end of the steam stripping defluorination tower is connected with a pressurized steam inlet pipe, a pressurized air inlet pipe and a defluorination sulfuric acid outlet pipe, a pump body is mounted on the defluorination sulfuric acid outlet pipe, a cooler and a steam condensate tank are mounted on a pipeline between the steam stripping defluorination tower and the fluorine absorption system, and the steam condensate tank is connected with the steam stripping defluorination tower. And the pipeline between the cooler and the fluorine absorption system is connected with a fan. Through a physical separation mode, fluorides in sulfuric acid can be effectively removed, the defluorination efficiency is improved, and fluorine resources in byproduct sulfuric acid of a lithium hexafluorophosphate process production device can be greatly recovered.

Description

Technical Field

[0001] The utility model relates to the technical field of defluorination equipment, in particular to a defluorination device for fluorosulfuric acid. Background Art

[0002] With the continuous boom of the new energy industry, a large number of lithium hexafluorophosphate production devices are installed, and the production capacity is constantly climbing, resulting in a large increase in the fluorosulfuric acid by-produced in its process. The fluorine content in this part of sulfuric acid is about 8%-15%.

[0003] At present, the treatment method of this part of sulfuric acid is to directly add it into the wet-process phosphoric acid extraction tank and use it as a raw material. Most of the fluorine contained in this part of sulfuric acid enters the wet-process phosphoric acid system, and a small part overflows and is recovered during the reaction process in the wet-process phosphoric acid extraction tank. This leads to an increase in the fluorine content in the wet-process phosphoric acid system, accelerating the blockage of the tank body and pipelines in the wet-process phosphoric acid system, shortening the cleaning cycle of the wet-process phosphoric acid system, and at the same time causing waste of fluorine resources. Summary of the Utility Model

[0004] Aiming at the deficiencies in the prior art, the utility model provides a defluorination device for fluorosulfuric acid. To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A defluorination device for fluorosulfuric acid includes a fluorosulfuric acid tank, a stripping defluorination tower, and a fluorine absorption system connected in sequence through pipelines. The fluorosulfuric acid tank is connected to a fluorosulfuric acid liquid pipe, and a high-pressure pump is installed on the pipeline between the fluorosulfuric acid tank and the stripping defluorination tower. The bottom end of the stripping defluorination tower is connected with a pressurized steam access pipe, an air access pipe, and a defluorinated sulfuric acid outlet pipe. A pump body is installed on the defluorinated sulfuric acid outlet pipe. A cooler and a steam condensate tank are installed on the pipeline between the stripping defluorination tower and the fluorine absorption system. A fan is connected to the pipeline between the cooler and the fluorine absorption system.

[0006] Furthermore, the fluorosulfuric acid tank is equipped with a stirrer for stirring.

[0007] Furthermore, a first rotating nozzle is installed at the end of the access pipe of the stripping defluorination tower and is arranged downward.

[0008] Furthermore, the ends of the steam access pipe and the air access pipe are respectively connected with a second rotating nozzle arranged upward.

[0009] Furthermore, the stripping defluorination tower is of a bubble-cap tower structure and is internally filled with PPH material Pall rings.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] 1. Through physical separation, fluoride in sulfuric acid can be effectively removed, the defluorination efficiency can be improved, and fluorine resources in the by-product sulfuric acid from the lithium hexafluorophosphate production device can be significantly recovered.

[0012] 2. By using a steam condensate reflux system, energy consumption can be reduced and operating costs can be lowered.

[0013] 3. The use of chemical agents is avoided, secondary pollution is reduced, which conforms to the development trend of green chemistry. Description of the Drawings

[0014] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0015] Figure 1 It is a schematic structural flow diagram of an embodiment of the present utility model.

[0016] In the above-mentioned drawings: fluorine-containing sulfuric acid tank 1, stripping defluorination tower 2, fluorine absorption system 3, fluorine-containing sulfuric acid liquid pipe 4, high-pressure pump 5, steam access pipe 6, air access pipe 7, defluorinated sulfuric acid outlet pipe 8, pump body 9, cooler 10, steam condensate tank 11, fan 12, stirrer 13, first rotating spray head 14, second rotating spray head 15. Detailed Embodiments

[0017] The technical solutions in the present utility model will be further described below in conjunction with the drawings and embodiments.

[0018] Embodiment 1

[0019] Please refer to Figure 1 As shown, a defluorination device for fluorine-containing sulfuric acid includes a fluorine-containing sulfuric acid tank, a stripping defluorination tower, and a fluorine absorption system connected in sequence through pipelines. The fluorine-containing sulfuric acid tank is connected to a fluorine-containing sulfuric acid liquid pipe, and a high-pressure pump is installed on the pipeline between the fluorine-containing sulfuric acid tank and the stripping defluorination tower. The bottom end of the stripping defluorination tower is connected with a pressurized steam access pipe, an air access pipe, and a defluorinated sulfuric acid outlet pipe. A pump body is installed on the defluorinated sulfuric acid outlet pipe. A cooler and a steam condensate tank are installed on the pipeline between the stripping defluorination tower and the fluorine absorption system. A fan is connected to the pipeline between the cooler and the fluorine absorption system.

[0020] The fluorine-containing sulfuric acid is transported through a fluorine-containing sulfuric acid liquid pipe into a fluorine-containing sulfuric acid tank. A high-pressure pump is used to pump the fluorine-containing sulfuric acid to the upper part of a stripping de-fluorination tower. At the same time, medium-pressure steam and air are introduced into the bottom of the stripping de-fluorination tower, so that the fluorine-containing sulfuric acid is fully mixed and contacted with the medium-pressure steam and air, and the fluorine in the fluorine-containing sulfuric acid is entrained. After the fluorine-containing gas is cooled by a cooler, the waste heat steam is condensed into steam condensate and flows back to the steam condensate tank, while the fluorine-containing gas is pumped to a fluorine absorption system for recovery by a fan. The de-fluorinated sulfuric acid is discharged from the bottom of the stripping de-fluorination tower, effectively removing the fluoride in the sulfuric acid, improving the de-fluorination efficiency, and being able to greatly recover the fluorine resources in the by-product sulfuric acid of the lithium hexafluorophosphate process production device.

[0021] Preferably, as Figure 1 shown, the fluorine-containing sulfuric acid tank is equipped with a stirrer for stirring. The stirrer can ensure that the fluorine-containing sulfuric acid is evenly distributed in the tank, preventing local concentration from being too high or too low, which helps the stability and efficiency of subsequent treatment steps. The stirrer can prevent precipitation, maintain the uniformity of the solution, and avoid clogging of pipelines or equipment by precipitates during subsequent treatment.

[0022] Preferably, as Figure 1 shown, a first rotating nozzle is installed at the end of the access pipe of the stripping de-fluorination tower and is arranged downward. The first rotating nozzle makes the sprayed fluorine-containing sulfuric acid evenly distributed in the stripping de-fluorination tower, facilitating full mixing and contact with steam and air.

[0023] Preferably, upwardly arranged second rotating nozzles are respectively connected to the ends of the steam access pipe and the air access pipe. This facilitates uniform mixing with the fluorine-containing sulfuric acid.

[0024] Preferably, the stripping de-fluorination tower is of a bubble-cap tower structure and is internally filled with PPH material Pall rings. In order to ensure efficient and stable gas-liquid contact and mass transfer processes during the treatment of fluorine-containing sulfuric acid, and at the same time have good corrosion resistance and operation stability, so as to achieve an ideal de-fluorination effect.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A defluorination device for fluorine-containing sulfuric acid, characterized in that: The invention comprises a fluorine-containing sulfuric acid tank, a stripping defluorination tower and a fluorine absorption system which are sequentially connected through pipelines. The fluorine-containing sulfuric acid tank is connected to a fluorine-containing sulfuric acid liquid pipe. A high-pressure pump is installed on the pipeline between the fluorine-containing sulfuric acid tank and the stripping defluorination tower. The bottom end of the stripping defluorination tower is connected to a pressurized steam inlet pipe, an air inlet pipe and a defluorination sulfuric acid outlet pipe. A pump body is installed on the defluorination sulfuric acid outlet pipe. A cooler and a steam condensate tank are installed on the pipeline between the stripping defluorination tower and the fluorine absorption system. A fan is connected to the pipeline between the cooler and the fluorine absorption system.

2. A defluorination device for fluorine-containing sulfuric acid according to claim 1, characterized in that: The fluorine-containing sulfuric acid tank is equipped with a stirrer for stirring.

3. The defluorination device of fluorine-containing sulfuric acid according to claim 1, characterized in that: A first rotating nozzle arranged downward is installed at the end of the access pipe of the stripping defluorination tower.

4. A defluorination device for fluorine-containing sulfuric acid according to claim 3, characterized in that: The ends of the steam inlet pipe and the air inlet pipe are respectively connected with second rotating nozzles arranged upward.

5. The defluorination device of fluorine-containing sulfuric acid according to claim 1, characterized in that: The stripping defluorination tower is a bubble tower structure, and is filled with PPH ball rings.

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