Concentrated sulfuric acid diluting and cooling device

Abstract

The utility model discloses a concentrated sulfuric acid diluting and cooling device, which belongs to the technical field of wet recovery production of lithium ion batteries and comprises a concentrated sulfuric acid head tank, a pure water head tank, a round block hole type graphite heat exchanger, a dilute sulfuric acid storage tank, a concentrated sulfuric acid circulation pipeline, a pure water circulation pipeline, a dilute sulfuric acid circulation pipeline and a discharge pipeline. The concentrated sulfuric acid head tank is communicated with the round block hole type graphite heat exchanger through a concentrated sulfuric acid circulation pipeline, the pure water head tank is communicated with the round block hole type graphite heat exchanger through a pure water circulation pipeline, the round block hole type graphite heat exchanger is communicated with the dilute sulfuric acid storage tank through a dilute sulfuric acid circulation pipeline, and the dilute sulfuric acid storage tank is further connected with a discharging pipeline. A pump is further arranged on the discharging pipeline; a concentrated sulfuric acid regulating valve is arranged on the concentrated sulfuric acid circulation pipeline; a pure water regulating valve is arranged on the pure water circulating pipeline; according to the utility model, the concentrated sulfuric acid regulating valve and the pure water regulating valve are used for controlling the adding amount of concentrated sulfuric acid and pure water, so that the dilute sulfuric acid with any concentration can be blended, and the energy consumption is lower.

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 concentrated sulfuric acid dilution 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 reaction liquid 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, which is a safety hazard. Therefore, in the process of lithium-ion battery recovery acid leaching, how to reduce the consumption of raw materials and control the temperature of the reaction is particularly important.

[0003] At present, the most effective device is to dilute and cool the concentrated sulfuric acid first, and then use the cooled dilute sulfuric acid as an acid leaching agent. The traditional concentrated sulfuric acid dilution and cooling device is to first mix the dilute sulfuric acid to a certain concentration through a stirring tank, and then circulate and cool it through a heat exchanger before use. Because the traditional concentrated sulfuric acid dilution and cooling device uses a high-power stirring tank and circulating pump, it is a high-energy-consuming process.

[0004] Therefore, how to provide a low-energy concentrated sulfuric acid dilution and cooling device is a problem that technical personnel in this field need to solve urgently. Utility Model Content

[0005] The main purpose of the utility model is to provide a concentrated sulfuric acid dilution and cooling device to solve the above technical problems. The device uses a concentrated sulfuric acid regulating valve and a pure water regulating valve to control the amount of concentrated sulfuric acid and pure water added, which can achieve the preparation of dilute sulfuric acid of any concentration, and the energy consumption is also lower.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A concentrated sulfuric acid dilution and cooling device comprises a concentrated sulfuric acid high-level tank, a pure water high-level tank, a round block hole type graphite heat exchanger, a dilute sulfuric acid storage tank, a concentrated sulfuric acid circulation pipeline, a pure water circulation pipeline, a dilute sulfuric acid circulation pipeline and a discharge pipeline, wherein the concentrated sulfuric acid high-level tank is connected to the round block hole type graphite heat exchanger through the concentrated sulfuric acid circulation pipeline, the pure water high-level tank is connected to the round block hole type graphite heat exchanger through the pure water circulation pipeline, the round block hole type graphite heat exchanger is connected to the dilute sulfuric acid storage tank through the dilute sulfuric acid circulation pipeline, the dilute sulfuric acid storage tank is also connected to the discharge pipeline, and a pump is also provided on the discharge pipeline; a concentrated sulfuric acid regulating valve is provided on the concentrated sulfuric acid circulation pipeline; and a pure water regulating valve is provided on the pure water circulation pipeline.

[0008] Furthermore, the round block hole type graphite heat exchanger is divided into a mixing zone, a cooling zone and a discharging zone. The mixing zone is connected to a concentrated sulfuric acid circulation pipeline and a pure water circulation pipeline, and the discharging zone is connected to a dilute sulfuric acid circulation pipeline.

[0009] Furthermore, a circulating cooling layer is provided on the mixing zone and the cooling zone, and a circulating cooling water inlet and a circulating cooling water outlet are provided on the circulating cooling layer, and a circulating cooling water outlet valve and a circulating cooling water inlet valve are provided at the circulating cooling water outlet and the circulating cooling water inlet, respectively. The circulating cooling water inlet of the circulating cooling layer in the mixing zone is connected with the circulating cooling water input end through pipeline 1, and a circulating cooling water regulating valve 1 is provided on the pipeline 1, and the circulating cooling water inlet of the circulating cooling layer in the cooling zone is connected with the circulating cooling water input end through pipeline 2, and a circulating cooling water regulating valve 2 is provided on the pipeline 2. A dilute sulfuric acid thermometer and a dilute sulfuric acid outlet valve are provided on the dilute sulfuric acid circulation pipeline, and the dilute sulfuric acid thermometer is interlocked with the circulating cooling water regulating valve 1 and the circulating cooling water regulating valve 2, respectively.

[0010] Furthermore, a concentrated sulfuric acid flow meter is also provided on the concentrated sulfuric acid circulation pipeline; and a pure water flow meter is also provided on the pure water circulation pipeline.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The concentrated sulfuric acid dilution and cooling device of the utility model utilizes a concentrated sulfuric acid regulating valve and a pure water regulating valve to control the amount of concentrated sulfuric acid and pure water added, and can achieve the preparation of dilute sulfuric acid of any concentration, and the energy consumption is also lower.

[0013] 2. The concentrated sulfuric acid dilution and cooling device of the utility model utilizes the thermometer arranged on the dilute sulfuric acid circulation pipeline to interlock the opening and closing angles of the circulating cooling water regulating valve 1 and the circulating cooling water regulating valve 2 to control the temperature of the dilute sulfuric acid when it flows out, thereby realizing the control of the cooling end point of the dilute sulfuric acid.

[0014] 3. The concentrated sulfuric acid dilution and cooling device of the utility model has a simple process, strong operability, and does not require high-power energy-consuming equipment, thus saving high operating 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 1It 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-block hole graphite heat exchanger, 31-mixing zone, 32-cooling zone, 33-discharging zone, 4-dilute sulfuric acid storage tank, 5-concentrated sulfuric acid circulation pipeline, 51-concentrated sulfuric acid regulating valve, 52-concentrated sulfuric acid flowmeter, 6-pure water circulation pipeline, 61-pure water regulating valve, 62-pure water flowmeter, 7-circulating cooling water circulation pipeline, 71-circulating cooling water regulating valve one, 72-circulating cooling water regulating valve two, 73-dilute sulfuric acid 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 concentrated sulfuric acid dilution and cooling device, comprising a concentrated sulfuric acid high-level tank 1, a pure water high-level tank 2, a round block hole type graphite heat exchanger 3, a dilute sulfuric acid storage tank 4, a concentrated sulfuric acid circulation pipeline 5, a pure water circulation pipeline 6, a dilute sulfuric acid circulation pipeline and a discharge pipeline, wherein the concentrated sulfuric acid high-level tank 1 is connected to the round block hole type graphite heat exchanger 3 through the concentrated sulfuric acid circulation pipeline 5, the pure water high-level tank 2 is connected to the round block hole type graphite heat exchanger 3 through the pure water circulation pipeline 6, and the round block hole type graphite heat exchanger 3 It is connected to the dilute sulfuric acid storage tank 4 through a dilute sulfuric acid circulation pipeline, and the dilute sulfuric acid storage tank 4 is also connected to a discharge pipeline, and a pump is also provided on the discharge pipeline; the concentrated sulfuric acid circulation pipeline 5 is provided with a concentrated sulfuric acid regulating valve 51; the pure water circulation pipeline 6 is provided with a pure water regulating valve 61; the concentrated sulfuric acid regulating valve 51 is used to control the circulation amount of concentrated sulfuric acid; the pure water regulating valve 61 is used to control the circulation amount of pure water; the round block hole type graphite heat exchanger 3 is used to perform heat exchange to reduce the heat released when the concentrated sulfuric acid is diluted.

[0020] In this embodiment, the round block hole type graphite heat exchanger 3 is divided into a mixing zone 31, a cooling zone 32 and a discharge zone 33. The mixing zone 31 is connected to the concentrated sulfuric acid circulation pipeline 5 and the pure water circulation pipeline 6, and the discharge zone 33 is connected to the dilute sulfuric acid circulation pipeline.

[0021] In this embodiment, the mixing zone 31 and the cooling zone 32 are both provided with a circulating cooling layer, and the circulating cooling layer is provided with a circulating cooling water inlet and a circulating cooling water outlet, and the circulating cooling water outlet and the circulating cooling water inlet are respectively provided with a circulating cooling water outlet valve and a circulating cooling water inlet valve, the circulating cooling water inlet of the circulating cooling layer in the mixing zone 31 is connected to the circulating cooling water input end through a pipeline 1, and a circulating cooling water regulating valve 1 71 is provided on the pipeline 1, and the circulating cooling water inlet of the circulating cooling layer in the cooling zone 32 is connected to the circulating cooling water input end through a pipeline 1. The water inlet is connected with the circulating cooling water input end through pipeline 2, and a circulating cooling water regulating valve 2 72 is arranged on the pipeline 2. A dilute sulfuric acid thermometer 73 and a dilute sulfuric acid outlet valve are arranged on the dilute sulfuric acid circulation pipeline, and the dilute sulfuric acid thermometer 73 is interlocked with the circulating cooling water regulating valve 1 71 and the circulating cooling water regulating valve 2 72 respectively; the opening and closing angles of the circulating cooling water regulating valve 1 71 and the circulating cooling water regulating valve 2 72 are controlled by the temperature value set on the thermometer 73; the circulating cooling layer is used to perform heat exchange and cooling on the round block hole type graphite heat exchanger 3.

[0022] In this embodiment, a concentrated sulfuric acid flowmeter 52 is also provided on the concentrated sulfuric acid circulation pipeline 5; a pure water flowmeter 62 is also provided on the pure water circulation pipeline 6; the concentrated sulfuric acid flowmeter 52 is used to measure the concentrated sulfuric acid flow in the concentrated sulfuric acid circulation pipeline 5; and the pure water flowmeter 62 is used to measure the pure water flow in the pure water circulation pipeline 6.

[0023] Working principle: When in use, first open the circulating cooling water outlet valve, then open the dilute sulfuric acid outlet valve, and control the opening and closing angles of circulating cooling water regulating valve 1 71 and circulating cooling water regulating valve 2 72 through the temperature set by the dilute sulfuric acid thermometer 73 at the dilute sulfuric acid outlet. Determine the feed flow rates of concentrated sulfuric acid and pure water according to the concentration of dilute sulfuric acid, and control the opening and closing angles of concentrated sulfuric acid regulating valve 51 and pure water regulating valve 61 through the feed flow rates of concentrated sulfuric acid and pure water, thereby achieving the preparation of dilute sulfuric acid of a certain concentration and temperature.

[0024] Embodiment 1

[0025] This embodiment is a concentrated sulfuric acid dilution and cooling device. The circulating cooling water outlet valve and the dilute sulfuric acid outlet valve are opened, the dilute sulfuric acid outlet temperature is set to 50°C, and the concentrated sulfuric acid feed flow rate is set to 2m 3 / h, set the pure water feed flow rate to 4m 3 / h, stably and continuously delivering dilute sulfuric acid to the dilute sulfuric acid storage tank 4.

[0026] Embodiment 2

[0027] This embodiment is a concentrated sulfuric acid dilution and cooling device. The circulating cooling water outlet valve and the dilute sulfuric acid outlet valve are opened, the dilute sulfuric acid outlet temperature is set to 50°C, and the concentrated sulfuric acid feed flow rate is set to 2m3 / h, set the pure water feed flow rate to 8m 3 / h, stably and continuously delivering dilute sulfuric acid to the dilute sulfuric acid storage tank 4.

[0028] Embodiment 3

[0029] This embodiment is a concentrated sulfuric acid dilution and cooling device. The circulating cooling water outlet valve and the dilute sulfuric acid outlet valve are opened, the dilute sulfuric acid outlet temperature is set to 45°C, and the concentrated sulfuric acid feed flow rate is set to 2m 3 / h, set the pure water feed flow rate to 4m 3 / h, stably and continuously delivering dilute sulfuric acid to the dilute sulfuric acid storage tank 4.

[0030] Embodiment 4

[0031] This embodiment is a concentrated sulfuric acid dilution and cooling device. The circulating cooling water outlet valve and the dilute sulfuric acid outlet valve are opened, the dilute sulfuric acid outlet temperature is set to 45°C, and the concentrated sulfuric acid feed flow rate is set to 2m 3 / h, set the pure water feed flow rate to 8m 3 / h, stably and continuously delivering dilute sulfuric acid to the dilute sulfuric acid storage tank 4.

[0032] 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.

[0033] 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 concentrated sulfuric acid dilution 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 round block hole type graphite heat exchanger (3), a dilute sulfuric acid storage tank (4), a concentrated sulfuric acid circulation pipeline (5), a pure water circulation pipeline (6), a dilute sulfuric acid circulation pipeline and a discharge pipeline. The concentrated sulfuric acid high-level tank (1) is connected to the round block hole type graphite heat exchanger (3) through the concentrated sulfuric acid circulation pipeline (5), the pure water high-level tank (2) is connected to the round block hole type graphite heat exchanger (3) through the pure water circulation pipeline (6), the round block hole type graphite heat exchanger (3) is connected to the dilute sulfuric acid storage tank (4) through the dilute sulfuric acid circulation pipeline, the dilute sulfuric acid storage tank (4) is also connected to the discharge pipeline, and a pump is also provided on the discharge pipeline; the concentrated sulfuric acid circulation pipeline (5) is provided with a concentrated sulfuric acid regulating valve (51); and the pure water circulation pipeline (6) is provided with a pure water regulating valve (61).

2. A concentrated sulfuric acid dilution and cooling device according to claim 1, characterized in that: The circular block hole type graphite heat exchanger (3) is divided into a mixing zone (31), a cooling zone (32) and a discharge zone (33); the mixing zone (31) is connected to a concentrated sulfuric acid circulation pipeline (5) and a pure water circulation pipeline (6); and the discharge zone (33) is connected to a dilute sulfuric acid circulation pipeline.

3. A concentrated sulfuric acid dilution and cooling device according to claim 2, characterized in that: The mixing zone (31) and the cooling zone (32) are both provided with a circulating cooling layer, and the circulating cooling layer is both provided with a circulating cooling water inlet and a circulating cooling water outlet, and the circulating cooling water outlet and the circulating cooling water inlet are respectively provided with a circulating cooling water outlet valve and a circulating cooling water inlet valve, the circulating cooling water inlet of the circulating cooling layer in the mixing zone (31) is connected with the circulating cooling water input end through a pipe 1, and a circulating cooling water regulating valve 1 (71) is provided on the pipe 1, the circulating cooling water inlet of the circulating cooling layer in the cooling zone (32) is connected with the circulating cooling water input end through a pipe 2, and a circulating cooling water regulating valve 2 (72) is provided on the pipe 2, the dilute sulfuric acid circulation pipe is provided with a dilute sulfuric acid thermometer (73) and a dilute sulfuric acid outlet valve, and the dilute sulfuric acid thermometer (73) is interlocked with the circulating cooling water regulating valve 1 (71) and the circulating cooling water regulating valve 2 (72), respectively.

4. A concentrated sulfuric acid dilution and cooling device according to claim 1, characterized in that: The concentrated sulfuric acid circulation pipeline (5) is also provided with a concentrated sulfuric acid flow meter (52); and the pure water circulation pipeline (6) is also provided with a pure water flow meter (62).

Images