Dilute sulfuric acid blending and cooling device
By designing a dilute sulfuric acid mixing and cooling device during the wet recovery process of lithium-ion batteries, and controlling the dilute sulfuric acid concentration and temperature using flowmeters and cooling pipelines, the problem of concentrated sulfuric acid heat release is solved, safe and efficient dilute sulfuric acid mixing is achieved, and cost is reduced and hydrogen peroxide consumption.
Patent Information
- Application Number
- CN202421012465.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-11
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-11
AI Technical Summary
During the wet recovery process of lithium-ion batteries, the dilution heat of concentrated sulfuric acid leads to a sudden increase in temperature, affecting the decomposition rate and safety of hydrogen peroxide, and it is difficult to control the reaction rate, which poses high consumption and safety risks.
A dilute sulfuric acid mixing and cooling device is designed, and the concentration of dilute sulfuric acid is controlled by using a concentrated sulfuric acid flowmeter and a pure water flowmeter, and cooled through a graphite-modified polypropylene tube heat exchanger and cooling pipeline to ensure safe operation.
The arbitrary concentration of dilute sulfuric acid is achieved and the temperature control is controlled, which reduces costs, improves safety and efficiency, and saves the consumption of hydrogen peroxide.
Smart Images
Figure CN222287207U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of wet recovery production of lithium ion batteries, and specifically relates to a dilute sulfuric acid mixing and cooling device. Background Art
[0002] At present, in the acid leaching process of wet recovery of lithium-ion batteries, concentrated sulfuric acid is often used as the acid leaching agent and hydrogen peroxide is used as the redox agent. The dilution heat of concentrated sulfuric acid is 85.5 kJ / mol. Adding a large amount of concentrated sulfuric acid in the acid leaching process of lithium-ion battery recovery will release a large amount of heat, causing the temperature of the leaching solution to rise sharply, thereby affecting the decomposition rate of hydrogen peroxide and increasing the consumption of hydrogen peroxide. In addition, as the reaction temperature rises sharply, the rate of the acid leaching reaction is difficult to control, posing a safety hazard. At the same time, in order to reduce the consumption of raw hydrogen peroxide and control the reaction temperature, it is an effective method to first mix concentrated sulfuric acid into dilute sulfuric acid and then cool the dilute sulfuric acid before use.
[0003] Therefore, how to provide a dilute sulfuric acid preparation and cooling device is a problem that those skilled in the art need to solve urgently. Utility Model Content
[0004] The main purpose of the utility model is to provide a dilute sulfuric acid preparation and cooling device to solve the above technical problems. The device uses a concentrated sulfuric acid flowmeter and a pure water flowmeter to control the feed amount of concentrated sulfuric acid and pure water in the dilute sulfuric acid preparation tank, so as to prepare dilute sulfuric acid of any concentration, and uses a cooling pipeline to cool the dilute sulfuric acid to ensure the safe operation of the device.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A dilute sulfuric acid mixing and cooling device comprises a concentrated sulfuric acid high-level tank, a pure water high-level tank, a dilute sulfuric acid mixing tank, a graphite modified polypropylene shell-and-tube heat exchanger, a concentrated sulfuric acid circulation pipeline, a pure water circulation pipeline, a dilute sulfuric acid circulation pipeline, a discharge pipeline and a cooling pipeline, wherein the concentrated sulfuric acid high-level tank is connected to the dilute sulfuric acid mixing tank through the concentrated sulfuric acid circulation pipeline, the pure water high-level tank is connected to the dilute sulfuric acid mixing tank through the pure water circulation pipeline, the dilute sulfuric acid mixing tank is connected to the graphite modified polypropylene shell-and-tube heat exchanger through the dilute sulfuric acid circulation pipeline, the graphite modified polypropylene shell-and-tube heat exchanger is connected to the discharge pipeline, a branch pipeline is arranged on the discharge pipeline to connect with the dilute sulfuric acid mixing tank, a cooling pipeline is connected to the graphite modified polypropylene shell-and-tube heat exchanger, a pump is arranged on the concentrated sulfuric acid circulation pipeline, a concentrated sulfuric acid flowmeter is arranged on the concentrated sulfuric acid circulation pipeline, and a pure water flowmeter is arranged on the pure water circulation pipeline; valves are arranged on the concentrated sulfuric acid circulation pipeline, the pure water circulation pipeline, the dilute sulfuric acid circulation pipeline, the discharge pipeline, the branch pipeline and the cooling pipeline.
[0007] Furthermore, a thermometer is provided on the dilute sulfuric acid preparation tank.
[0008] Furthermore, a stirrer is provided in the dilute sulfuric acid preparation tank.
[0009] Furthermore, the graphite modified polypropylene shell and tube heat exchanger includes a shell side, a tube side is circumferentially arranged around the middle position of the shell side, one end of the tube side is connected to the dilute sulfuric acid circulation pipeline, and the other end is connected to the discharge pipeline, a cooling water inlet and a cooling water outlet are arranged on the shell side, and the cooling water inlet and the cooling water outlet are connected to the circulating cooling water source through a pipeline, and valves are arranged at the cooling water inlet and the cooling water outlet.
[0010] Furthermore, the tube side of the graphite-modified polypropylene shell-and-tube heat exchanger is made of graphite-modified polypropylene; and the shell side is made of polypropylene.
[0011] Compared with the prior art, the utility model has the following beneficial effects:
[0012] 1. The utility model utilizes a concentrated sulfuric acid flowmeter and a pure water flowmeter to control the feed amount of concentrated sulfuric acid and pure water in a dilute sulfuric acid preparation tank, thereby configuring dilute sulfuric acid of any concentration, and simultaneously utilizes a cooling pipe to cool the dilute sulfuric acid to ensure the safe operation of the device.
[0013] 2. By controlling the cooling time of the dilute sulfuric acid cycle, the preparation of dilute sulfuric acid with different cooling end temperatures can be achieved.
[0014] 3. The dilute sulfuric acid mixing and cooling device of the utility model has low manufacturing cost, saving high cost investment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0016] Figure 1 It is a structural schematic diagram of the utility model.
[0017] Among them, 1-concentrated sulfuric acid high-level tank, 2-pure water high-level tank, 3-dilute sulfuric acid preparation tank, 4-graphite modified polypropylene shell and tube heat exchanger, 41-tube side, 42-shell side, 5-concentrated sulfuric acid flowmeter, 6-pure water flowmeter, 7-thermometer. DETAILED DESCRIPTION
[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0019] like Figure 1 As shown, the utility model provides a dilute sulfuric acid preparation and cooling device, comprising a concentrated sulfuric acid high-level tank 1, a pure water high-level tank 2, a dilute sulfuric acid preparation tank 3, a graphite-modified polypropylene shell-and-tube heat exchanger 4, a concentrated sulfuric acid circulation pipeline, a pure water circulation pipeline, a dilute sulfuric acid circulation pipeline, a discharge pipeline and a cooling pipeline, wherein the concentrated sulfuric acid high-level tank 1 is connected to the dilute sulfuric acid preparation tank 3 through the concentrated sulfuric acid circulation pipeline, the pure water high-level tank 2 is connected to the dilute sulfuric acid preparation tank 3 through the pure water circulation pipeline, the dilute sulfuric acid preparation tank 3 is connected to the graphite-modified polypropylene shell-and-tube heat exchanger 4 through the dilute sulfuric acid circulation pipeline, and the graphite-modified polypropylene shell-and-tube heat exchanger 4 is connected to the discharge pipeline, The discharge pipe is provided with a branch pipe connected to the dilute sulfuric acid preparation tank 3, the graphite modified polypropylene shell and tube heat exchanger 4 is connected with a cooling pipe, the discharge pipe is provided with a pump, the concentrated sulfuric acid circulation pipe is provided with a concentrated sulfuric acid flowmeter 5, and the pure water circulation pipe is provided with a pure water flowmeter 6; valves are provided on the concentrated sulfuric acid circulation pipe, the pure water circulation pipe, the dilute sulfuric acid circulation pipe, the discharge pipe, the branch pipe and the cooling pipe; the cooling pipe is used to cool the dilute sulfuric acid in the graphite modified polypropylene shell and tube heat exchanger 4; the concentrated sulfuric acid flowmeter 5 and the pure water flowmeter are used to count the flow rates of the circulating concentrated sulfuric acid and pure water.
[0020] In this embodiment, a thermometer 7 is provided on the dilute sulfuric acid preparation tank 3 , and the thermometer 7 is used to measure the temperature in the dilute sulfuric acid preparation tank 3 .
[0021] In this embodiment, a stirrer is provided in the dilute sulfuric acid preparation tank 3, and the concentrated sulfuric acid and pure water in the graphite-modified polypropylene shell-and-tube heat exchanger 4 are stirred by the stirrer to make the dilution more sufficient and faster.
[0022] In this embodiment, the graphite modified polypropylene shell and tube heat exchanger 4 includes a shell side 42, and a tube side 41 is circumferentially arranged around the middle position of the shell side 42. One end of the tube side 41 is connected to the dilute sulfuric acid circulation pipeline, and the other end is connected to the discharge pipeline. A cooling water inlet and a cooling water outlet are arranged on the shell side 42, and the cooling water inlet and the cooling water outlet are connected to the circulating cooling water source through a pipeline, and valves are arranged at the cooling water inlet and the cooling water outlet; the shell side 42 is used to connect to the circulating cooling water source, and at the same time, heat is exchanged with the tube side 41 to reduce the temperature in the tube side 41.
[0023] In this embodiment, the tube side 41 of the graphite-modified polypropylene shell-and-tube heat exchanger 4 is made of graphite-modified polypropylene; and the shell side 42 is made of polypropylene.
[0024] Working principle: open the valve on the pure water circulation pipeline, configure the ratio of dilute sulfuric acid concentration as needed, determine the amount of pure water to be added, and then open the agitator of the dilute sulfuric acid preparation tank 3 after adding the measured amount of pure water. Open the valve on the concentrated sulfuric acid circulation pipeline according to the concentration of dilute sulfuric acid and slowly add the measured concentrated sulfuric acid. Open the cooling water inlet valve and the cooling water outlet valve. The evenly mixed dilute sulfuric acid is pumped into the graphite modified polypropylene shell and tube heat exchanger 4 for cooling. It is circulated through branch pipes and pumps for heat exchange to the required temperature, and then pumped to the user point for use.
[0025] Embodiment 1
[0026] This embodiment is a dilute sulfuric acid preparation and cooling device. 10m3 of water is added to the dilute sulfuric acid preparation tank. 3 of pure water, and then add 1m 3 The concentrated sulfuric acid is mixed evenly and then circulated for heat exchange. When the temperature of the dilute sulfuric acid reaches 50°C, it is pumped to the user for use.
[0027] Embodiment 2
[0028] This embodiment is a dilute sulfuric acid preparation and cooling device. 10m3 of water is added to the dilute sulfuric acid preparation tank. 3 of pure water, and then add 2m 3 The concentrated sulfuric acid is mixed evenly and then circulated for heat exchange. When the temperature of the dilute sulfuric acid reaches 50°C, it is pumped to the user for use.
[0029] Embodiment 3
[0030] This embodiment is a dilute sulfuric acid preparation and cooling device. 10m3 of water is added to the dilute sulfuric acid preparation tank. 3 of pure water, and then add 1m 3 The concentrated sulfuric acid is mixed evenly and then circulated for heat exchange. When the temperature of the dilute sulfuric acid reaches 40°C, it is pumped to the user for use.
[0031] Embodiment 4
[0032] This embodiment is a dilute sulfuric acid preparation and cooling device. 10m3 of water is added to the dilute sulfuric acid preparation tank. 3 of pure water, and then add 2m 3 The concentrated sulfuric acid is mixed evenly and then circulated for heat exchange. When the temperature of the dilute sulfuric acid reaches 40°C, it is pumped to the user for use.
[0033] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A dilute sulfuric acid preparation and cooling device, characterized in that: The invention comprises a concentrated sulfuric acid high-level tank (1), a pure water high-level tank (2), a dilute sulfuric acid preparation tank (3), a graphite-modified polypropylene shell-and-tube heat exchanger (4), a concentrated sulfuric acid circulation pipeline, a pure water circulation pipeline, a dilute sulfuric acid circulation pipeline, a discharge pipeline and a cooling pipeline, wherein the concentrated sulfuric acid high-level tank (1) is connected to the dilute sulfuric acid preparation tank (3) through the concentrated sulfuric acid circulation pipeline, the pure water high-level tank (2) is connected to the dilute sulfuric acid preparation tank (3) through the pure water circulation pipeline, and the dilute sulfuric acid preparation tank (3) is connected to the graphite-modified polypropylene shell-and-tube heat exchanger (4) through the dilute sulfuric acid circulation pipeline. The graphite-modified polypropylene shell-and-tube heat exchanger (4) is connected to a discharge pipe, a branch pipe is provided on the discharge pipe and connected to a dilute sulfuric acid preparation tank (3), a cooling pipe is connected to the graphite-modified polypropylene shell-and-tube heat exchanger (4), a pump is provided on the discharge pipe, a concentrated sulfuric acid flow meter (5) is provided on the concentrated sulfuric acid circulation pipe, and a pure water flow meter (6) is provided on the pure water circulation pipe; valves are provided on the concentrated sulfuric acid circulation pipe, the pure water circulation pipe, the dilute sulfuric acid circulation pipe, the discharge pipe, the branch pipe and the cooling pipe.
2. A dilute sulfuric acid mixing and cooling device according to claim 1, characterized in that: The dilute sulfuric acid preparation tank (3) is provided with a thermometer (7).
3. A dilute sulfuric acid mixing and cooling device according to claim 1, characterized in that: The dilute sulfuric acid preparation tank (3) is provided with a stirrer.
4. A dilute sulfuric acid mixing and cooling device according to claim 1, characterized in that: The graphite modified polypropylene shell and tube heat exchanger (4) comprises a shell side (42), a tube side (41) is circumferentially arranged around the middle position of the shell side (42), one end of the tube side (41) is connected to a dilute sulfuric acid circulation pipeline, and the other end is connected to a discharge pipeline, a cooling water inlet and a cooling water outlet are arranged on the shell side (42), and the cooling water inlet and the cooling water outlet are connected to a circulating cooling water source through a pipeline, and valves are arranged at the cooling water inlet and the cooling water outlet.
5. A dilute sulfuric acid mixing and cooling device according to claim 1, characterized in that: The tube side (41) on the graphite-modified polypropylene shell-and-tube heat exchanger (4) is made of graphite-modified polypropylene; The shell side (42) is made of polypropylene.