Equipment for preventing reverse mixing of solution

Abstract

The utility model relates to the technical field of iron phosphate production, and particularly discloses solution reverse mixing prevention equipment which comprises a tubular mixer and a hydrogen peroxide tank, the feed port end of the tubular mixer is communicated with the hydrogen peroxide tank through a first pipeline, and the discharge port end of the tubular mixer is communicated with a plate heat exchanger through a second pipeline. A first pneumatic valve is arranged on the first pipeline between the tubular mixer and the hydrogen peroxide tank, a first temperature sensor is arranged on the first pneumatic valve, and the first temperature sensor is electrically connected with a controller. The plate heat exchanger cools the reaction solution to avoid sudden temperature rise in the tubular mixer, meanwhile, the first temperature sensor can monitor the temperature of the solution in the first pipeline, and when the temperature of the solution in the first pipeline is higher than 40 DEG C, the temperature sensor is linked with the controller to close the first pneumatic valve; the solution in the tubular mixer is prevented from reversely flowing back into the hydrogen peroxide tank, and the risk of explosion caused by the fact that hydrogen peroxide in the tubular mixer is oxidized is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of ferric phosphate production, in particular to a device for preventing solution backflow. Background Art

[0002] With the continuous development of the new energy industry, the power battery industry, as a new energy source and environmentally friendly, low-carbon energy source, has experienced rapid growth. Lithium-ion batteries, with their excellent performance and reasonable manufacturing costs, have become the mainstream development direction for many power batteries. Lithium iron phosphate batteries offer a stable charge-discharge platform, excellent safety, low self-discharge, low cost, and environmental friendliness. They are currently the ideal cathode material for high-energy lithium batteries for hybrid and electric vehicles, ultra-large-capacity power sources, and wind and solar energy storage devices. Currently, demand for lithium iron phosphate cathode materials in China is experiencing a spiraling upward trend. As a key precursor for the synthesis of lithium iron phosphate, the quality and performance of iron phosphate have a significant impact on lithium iron phosphate batteries. Theoretically, the production of one ton of battery-grade lithium iron phosphate consumes 0.92 tons of anhydrous iron phosphate, equivalent to 90% of the total demand for lithium iron phosphate. The rapid expansion of lithium iron phosphate battery applications in energy storage and 5G base stations has led to a surge in demand for lithium iron phosphate, and consequently, demand for iron phosphate as a raw material.

[0003] Currently, the preparation processes for ferric phosphate include solid-phase synthesis, hydrothermal, sol-gel, template, sonochemical, homogeneous precipitation, ion exchange delithiation, and air oxidation. The primary method for preparing ferric phosphate in China is co-precipitation, which uses ferrous sulfate as the iron source and phosphoric acid (H3PO4) or phosphates (such as ammonium phosphate) as the phosphorus source. A certain amount of the iron source is dissolved in a phosphoric acid solution to form a solution. The pH of the solution is then adjusted to control product crystallization, and an excess of hydrogen peroxide (H2O2) is then added to fully oxidize the ferrous ions (Fe2+) in the solution to ferric ions (Fe3+). The oxidation process of the prepared liquid is carried out in the oxidation liquid storage tank, and hydrogen peroxide is stored in the hydrogen peroxide tank. The hydrogen peroxide in the hydrogen peroxide tank is transported to the oxidation liquid storage tank through a pipeline. This method cannot control the amount of hydrogen peroxide transported, which often leads to excessive consumption of hydrogen peroxide. In addition, the temperature in the oxidation liquid storage tank will gradually increase during the oxidation process, making the pressure in the oxidation liquid storage tank greater than the pressure in the hydrogen peroxide tank, causing the ferrous solution in the oxidation liquid storage tank to flow back into the hydrogen peroxide tank, causing the hydrogen peroxide in the hydrogen peroxide tank to decompose. At the same time, the hydrogen peroxide releases heat and accelerates the decomposition reaction, making the hydrogen peroxide tank prone to explosion risk. Utility Model Content

[0004] The purpose of the utility model is to provide a device for preventing solution backflow, so as to solve the problem that in the preparation process of ferric phosphate, hydrogen peroxide is consumed too much and the ferrous solution in the oxidizing solution storage tank backflows into the hydrogen peroxide tank, resulting in the decomposition of hydrogen peroxide and the risk of explosion.

[0005] In order to solve the above problems, the technical solutions provided are as follows:

[0006] A device for preventing solution cross-contamination includes a tubular mixer and a hydrogen peroxide tank. The feed port of the tubular mixer is connected to the hydrogen peroxide tank via a first pipe, and the discharge port of the tubular mixer is connected to a plate heat exchanger via a second pipe. A first pneumatic valve is provided on the first pipe between the tubular mixer and the hydrogen peroxide tank, and a first temperature sensor is provided on the first pneumatic valve. The first temperature sensor is electrically connected to a controller.

[0007] The basic principle and beneficial effects of the above technical solution are: the ferrous solution enters the tubular mixer (equivalent to the oxidizing liquid storage tank in the background technology), the controller controls the first pneumatic valve to open, so that the hydrogen peroxide tank transports the hydrogen peroxide ferrous oxide solution to the tubular mixer through the first pipe, the plate heat exchanger cools the reaction solution to avoid a sudden temperature rise in the tubular mixer, and at the same time, the first temperature sensor can monitor the temperature of the solution in the first pipe. When the temperature of the solution in the first pipe is higher than 40°C, the temperature sensor will link the controller to close the first pneumatic valve to prevent the solution in the tubular mixer from flowing back into the hydrogen peroxide tank, thereby preventing the hydrogen peroxide in the tubular mixer from being oxidized and causing an explosion risk.

[0008] Furthermore, a branch pipe is provided on the pipe at the feed inlet end of the tubular mixer, and a first liquid distribution flow meter is provided on the branch pipe. The first liquid distribution flow meter is used to measure the feed amount of the ferrous solution.

[0009] Furthermore, a third pipe is provided at the outlet of the plate heat exchanger, connected to a circulation pipe equipped with a second temperature sensor. The outlet of the circulation pipe is connected to the inlet of the plate heat exchanger. The second temperature sensor detects the temperature of the solution flowing out of the plate heat exchanger. When the temperature is above 40°C, the circulation pipe is opened, and the solution circulates through the circulation pipe into the plate heat exchanger for a secondary cooling. When the temperature is below 40°C, the solution can flow directly out of the outlet of the third pipe.

[0010] Furthermore, a second liquid distribution flow meter is provided on the first pipeline, and the second liquid distribution flow meter is used to measure the feed amount of the hydrogen peroxide solution.

[0011] Furthermore, the first liquid distribution flowmeter is connected to multiple branch pipes, each branch pipe is connected to a tubular mixer, and multiple branch pipes are connected to multiple tubular mixers. All tubular mixers are provided with a first pipe, and all first pipes are connected to a hydrogen peroxide tank. The multiple tubular mixers operate simultaneously, thereby improving the oxidation efficiency of the ferrous solution.

[0012] Furthermore, each branch pipeline is provided with a second pneumatic valve which controls whether to continue to transport the ferrous oxide solution into the tubular mixer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of an embodiment of the present invention.

[0014] The figure marks in the drawings of the specification include: tubular mixer 1, hydrogen peroxide tank 2, first pipeline 3, first pneumatic valve 4, first temperature sensor 5, second liquid distribution flowmeter 6, second pipeline 7, plate heat exchanger 8, third pipeline 9, circulation pipe 10, second temperature sensor 11, branch pipeline 12, first liquid distribution flowmeter 13, second pneumatic valve 14. DETAILED DESCRIPTION

[0015] The following is further described in detail through specific implementation methods:

[0016] The embodiment is basically as shown in the attached Figure 1 As shown:

[0017] A device to prevent solution from flowing back, such as Figure 1 As shown, it includes a tubular mixer 1 and a hydrogen peroxide tank 2. The feed port end of the tubular mixer 1 is connected to the hydrogen peroxide tank 2 through a first pipe 3. A first pneumatic valve 4 is provided on the first pipe 3 between the tubular mixer 1 and the hydrogen peroxide tank 2. The first pneumatic valve 4 is provided with a first temperature sensor 5. The first pipe 3 is provided with a second liquid distribution flowmeter 6. The discharge port end of the tubular mixer 1 is connected to a plate heat exchanger 8 through a second pipe 7. The discharge port end of the plate heat exchanger 8 is provided with a third pipe 9. The third pipe 9 is connected to a circulation pipe 10. The circulation pipe 10 is provided with a second temperature sensor 11. The discharge port end of the circulation pipe 10 is connected to the feed port end of the plate heat exchanger 8. The first temperature sensor 5 and the second temperature sensor 11 are electrically connected to a controller. A branch pipe 12 is provided on the pipe at the feed port end of the tubular mixer 1, and a first liquid distribution flowmeter 13 is provided on the branch pipe 12. The first liquid distribution flowmeter 13 is commonly connected to two branch pipes 12, and each branch pipe 12 is provided with a second pneumatic valve 14. Each branch pipe 12 is connected to a tubular mixer 1, and two branch pipes 12 are respectively connected to two tubular mixers 1. All tubular mixers 1 are provided with a first pipe 3, and all first pipes 3 are commonly connected to a hydrogen peroxide tank 2. The hydrogen peroxide tank 2 is equipped with a temperature sensor (not shown in the figure). The temperature sensor in the hydrogen peroxide tank 2 can monitor the temperature of the solution in the hydrogen peroxide tank 2 at any time.

[0018] The specific implementation process is as follows:

[0019] The ferrous solution enters the tubular mixer 1 through the branch pipe 12. The controller controls the first pneumatic valve 4 to open, so that the hydrogen peroxide tank 2 transports the hydrogen peroxide ferrous oxide solution to the tubular mixer 1 through the first pipe 3. The plate heat exchanger 8 cools the reaction solution to prevent a sudden temperature rise in the tubular mixer 1. At the same time, the first temperature sensor 5 can monitor the temperature of the solution in the first pipe 3. When the temperature of the solution in the first pipe 3 is higher than 40°C, the first temperature sensor 5 will link the controller to close the first pneumatic valve 4 to prevent the solution in the tubular mixer 1 from flowing back into the hydrogen peroxide tank 2, thereby preventing the hydrogen peroxide in the tubular mixer 1 from being oxidized and causing an explosion risk.

[0020] The above is only an embodiment of the present invention, and the commonly known specific structures and characteristics of the scheme are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, and these should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A device for preventing solution backflow, comprising a tubular mixer and a hydrogen peroxide tank, characterized in that: The feed port end of the tubular mixer is connected to a hydrogen peroxide tank through a first pipe, and the discharge port end of the tubular mixer is connected to a plate heat exchanger through a second pipe. A first pneumatic valve is provided on the first pipe between the tubular mixer and the hydrogen peroxide tank, and a first temperature sensor is provided on the first pneumatic valve. The first temperature sensor is electrically connected to a controller.

2. The device for preventing solution backflow according to claim 1, characterized in that: A branch pipeline is provided on the pipeline at the feed inlet end of the tubular mixer, and a first liquid distribution flow meter is provided on the branch pipeline.

3. The device for preventing solution backflow according to claim 2, characterized in that: The plate heat exchanger is provided with a third pipe at the discharge port end, the third pipe is connected to a circulation pipe, the circulation pipe is provided with a second temperature sensor, and the discharge port end of the circulation pipe is connected to the plate heat exchanger inlet end.

4. The device for preventing solution backflow according to claim 3, characterized in that: A second liquid distribution flow meter is provided on the first pipeline.

5. The device for preventing solution backflow according to claim 4, characterized in that: The first liquid distribution flow meter is connected to multiple branch pipes, each branch pipe is connected to a tubular mixer, multiple branch pipes are connected to multiple tubular mixers, all tubular mixers are provided with first pipes, and all first pipes are connected to a hydrogen peroxide tank.

6. The device for preventing solution backflow according to claim 5, characterized in that: Each branch pipeline is provided with a second pneumatic valve.

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