Preparation device of lithium bicarbonate solution

Abstract

The invention provides a preparation device of a lithium bicarbonate solution. The preparation device comprises a vertical reaction chamber; the temperature control jacket is arranged on the outer surface of the vertical reaction cavity, a liquid carbon dioxide inlet is formed in the top of the temperature control jacket, and a gaseous carbon dioxide outlet is formed in the bottom of the temperature control jacket; the exhaust port is formed in the top of the vertical reaction cavity, and the exhaust port is higher than the first discharge port; the carbon dioxide input unit, the organic phase feed port and the water phase feed port are arranged at the bottom of the vertical reaction cavity, and the carbon dioxide input unit is connected with the gaseous carbon dioxide outlet; liquid carbon dioxide input from the liquid carbon dioxide inlet absorbs heat of reaction liquid in the vertical reaction cavity, is vaporized, is input into the vertical reaction cavity from the carbon dioxide input unit, is mixed with an organic phase and a water phase, and is subjected to reverse extraction; and the stirring unit is used for stirring the solution in the vertical reaction cavity.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and in particular to a device for preparing a lithium bicarbonate solution. Background Art

[0002] Lithium carbonate is the most important and basic lithium salt in the lithium industry. The purity of lithium carbonate directly determines the quality of subsequent products. The industrial preparation of battery-grade lithium carbonate mainly uses industrial-grade lithium carbonate and CO2 gas as raw materials. The industrial-grade lithium carbonate is first hydrogenated into a saturated lithium bicarbonate solution and then decarbonized.

[0003] The process of preparing lithium carbonate from lepidolite generally includes: mixing lithium concentrate with auxiliary materials such as calcium sulfate and calcium carbonate, granulation, high-temperature roasting, leaching, impurity removal, purification and concentration, lithium precipitation to obtain lithium precipitation mother liquor, precipitation and filtration to obtain lithium extract, and carbon dioxide extraction of the lithium extract to obtain lithium bicarbonate solution. In this process, because the lithium extract itself has a certain temperature, and the subsequent carbon dioxide stripping process generates heat. Existing carbon dioxide stripping equipment uses a reactor, where gaseous carbon dioxide, water, and organic phase are introduced into the bottom, stirred and mixed, and the overflow is sent to a clarifier from the top; the other is a box-type stripping tank, where carbon dioxide is introduced into the bottom, stirred and mixed, and the overflow is sent to the clarifier. However, the reaction temperature of these two devices is relatively high, and the contact between gas and liquid is insufficient, which requires a long reaction time, generally 20-30 minutes of stripping time, and the production efficiency is relatively low. Summary of the Invention

[0004] The object of the present invention is to solve the above problems and provide a preparation device of lithium bicarbonate solution.

[0005] The technical solution of this application is achieved as follows:

[0006] The present invention provides a device for preparing lithium bicarbonate solution, comprising

[0007] Vertical reaction chamber;

[0008] A temperature-control jacket is provided on the outer surface of the vertical reaction chamber, wherein a liquid carbon dioxide inlet is provided at the top of the temperature-control jacket and a gaseous carbon dioxide outlet is provided at the bottom;

[0009] An exhaust port and a first discharge port are provided at the top of the vertical reaction chamber, and the height of the exhaust port is higher than that of the first discharge port;

[0010] A carbon dioxide input unit, an organic phase feed port, and an aqueous phase feed port are provided at the bottom of the vertical reaction chamber, and the carbon dioxide input unit is connected to the gaseous carbon dioxide outlet; the liquid carbon dioxide inputted from the liquid carbon dioxide inlet absorbs the heat of the reaction liquid in the vertical reaction chamber and then vaporizes, and is then inputted from the carbon dioxide input unit into the vertical reaction chamber to mix with the organic phase and the aqueous phase and then strip; and

[0011] The stirring unit is used to stir the solution in the vertical reaction chamber.

[0012] As a further improvement, the stirring unit specifically includes from top to bottom:

[0013] Motor;

[0014] reducer;

[0015] bearing housing;

[0016] a main shaft disposed on the bearing seat;

[0017] A plurality of turbine blades are arranged on the main shaft at intervals.

[0018] As a further improvement, a packing layer is further provided at the lower portion of the first discharge port, and the packing layer is used to absorb solid particles and prevent solid impurities from flowing out of the first discharge port.

[0019] As a further improvement, the vertical reaction chamber is provided with multiple layers of interconnected chambers along the height direction, and each layer of chambers is provided with a pair of turbine blades 7, and each layer of chambers is connected through a perforated plate.

[0020] As a further improvement, the through holes between the orifice plates are staggered to form turbulent flow, thereby accelerating the mixing between the gaseous carbon dioxide and the liquid; the size of the through holes on the orifice plates is 1 mm to 10 mm.

[0021] As a further improvement, a premixing chamber is further provided at the bottom of the vertical reaction chamber. The premixing chamber is provided below the carbon dioxide input unit and above the organic phase feed port and the aqueous phase feed port.

[0022] As a further improvement, the bottom of the vertical reaction chamber further includes a sewage outlet.

[0023] As a further improvement, the gaseous carbon dioxide is produced by vaporizing liquid carbon dioxide after absorbing heat from the reaction liquid in the vertical reaction chamber, so as to control the reaction temperature of the vertical reaction chamber at 20-40°C.

[0024] As a further improvement, the gaseous carbon dioxide is produced by vaporizing liquid carbon dioxide after absorbing heat from the reaction liquid in the vertical reaction chamber, so as to control the reaction temperature of the vertical reaction chamber at 25-30°C.

[0025] As a further improvement, the device for preparing the lithium bicarbonate solution further includes an oil-water separator connected to the first discharge port.

[0026] The advantages or beneficial effects of the above technical solution include at least:

[0027] Compared with the traditional method which takes 20-30 minutes for stripping, the present invention can achieve a stripping rate of more than 99% within 4-10 minutes by optimizing the vaporization reaction process of carbon dioxide, thereby greatly improving production efficiency.

[0028] Furthermore, the present invention utilizes the vaporization of liquid carbon dioxide to absorb heat and reduce temperature, while the generated gaseous carbon dioxide directly participates in the reaction, thereby improving carbon dioxide utilization. Furthermore, the present invention reduces the need for external cooling: by absorbing heat from the reaction solution and vaporizing it in the temperature-controlled jacket, the reaction temperature is effectively lowered, reducing the need for external cooling equipment and saving energy.

[0029] Finally, the present invention forms turbulence through the multi-layer chamber setting, staggered orifice plate through-holes and turbine blade design, accelerates the mixing of gaseous carbon dioxide and liquid, and improves the uniformity of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings illustrate exemplary implementations of the present application of embodiments of the present invention and, together with the description, are used to explain the principles of the present application. These drawings are included to provide a further understanding of the present application, and the drawings are included in and constitute a part of this specification.

[0031] Figure 1 The figure shows a schematic structural diagram of a device for preparing a lithium bicarbonate solution provided in an embodiment of the present invention.

[0032] Figure 2 The flowchart of the method for preparing the lithium bicarbonate solution provided by the embodiment of the present invention is shown. DETAILED DESCRIPTION

[0033] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are for illustrative purposes only and are not intended to limit the scope of protection of the present application.

[0034] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0035] The names of the messages or information exchanged between multiple devices in the embodiments of the present application are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0036] Reference Figure 1 , an embodiment of the present invention provides a device for preparing a lithium bicarbonate solution, which includes a vertical reaction chamber 20;

[0037] A temperature-controlled jacket 15 is provided on the outer surface of the vertical reaction chamber 20, wherein a liquid carbon dioxide inlet 14 is provided at the top of the temperature-controlled jacket 15, and a gaseous carbon dioxide outlet 16 is provided at the bottom;

[0038] An exhaust port 13 and a first discharge port 5 are provided at the top of the vertical reaction chamber 20, and the height of the exhaust port 13 is higher than that of the first discharge port 5;

[0039] A carbon dioxide input unit 12, an organic phase feed port 8, and an aqueous phase feed port 11 are provided at the bottom of the vertical reaction chamber 20, and the carbon dioxide input unit 12 is connected to the gaseous carbon dioxide outlet 16; the liquid carbon dioxide inputted through the liquid carbon dioxide inlet 14 absorbs the heat of the reaction liquid in the vertical reaction chamber 20 and then vaporizes, and is then inputted from the carbon dioxide input unit 12 into the vertical reaction chamber 20 to mix with the organic phase and the aqueous phase and then undergo stripping; and

[0040] The stirring unit is used to stir the solution in the vertical reaction chamber 20 .

[0041] The lithium-containing organic phase, aqueous phase and gaseous carbon dioxide will produce an exothermic reaction during the stripping process. The present invention creatively introduces liquid carbon dioxide into the temperature-controlled jacket 15. The heat generated by the absorption reaction can be vaporized into gaseous carbon dioxide and enter the reaction system for full reaction, thereby greatly improving the efficiency of the reaction.

[0042] The stirring unit specifically includes from top to bottom:

[0043] Motor 1;

[0044] Reducer 2;

[0045] Bearing seat 3;

[0046] A main shaft 4 is provided on the bearing seat 3;

[0047] Multiple turbine blades 7 are spaced apart on the main shaft 4. The device of the present invention uses vortex stirring to enhance suction and strengthen the internal liquid flow. In addition, the present invention makes full use of carbon dioxide by adding multiple layers of dispersing and mixing impellers.

[0048] As a further improvement, a packing layer 6 is further provided at the lower portion of the first discharge port 5 , and the packing layer 6 is used to absorb solid particles and prevent solid impurities from flowing out of the first discharge port 5 .

[0049] As a further improvement, the vertical reaction chamber 20 is provided with multiple layers of interconnected chambers along the height direction, and each layer of chambers is provided with a pair of turbine blades 7. Each layer of chambers is connected through a perforated plate. As a further improvement, the through holes between the orifice plates are staggered to form turbulence, thereby accelerating the mixing between the gaseous carbon dioxide and the liquid. The size of the through holes on the orifice plate is 1mm to 10mm. Preferably, the size of the through holes on the orifice plate is 3mm to 6mm. In one embodiment, the size of the through holes on the orifice plate is about 5mm. The number of chambers is not limited and can be 6 to 10 layers. In one embodiment, it includes 8 layers of chambers.

[0050] As a further improvement, a premixing chamber 21 is further provided at the bottom of the vertical reaction chamber 20. The premixing chamber 21 is provided below the carbon dioxide input unit 12 and above the organic phase feed port 8 and the aqueous phase feed port 11. The lithium-loaded organic phase and water fed from the organic phase feed port 8 and the aqueous phase feed port 11 are premixed in the premixing chamber 21 and then fed into the vertical reaction chamber 20 to be fully mixed with the carbon dioxide gas fed from the carbon dioxide input unit 12 for stripping. The organic phase feed port 8 and the aqueous phase feed port 11 are connected to the bottom of the premixing chamber 21 via a common pipe to promote full mixing of the organic phase and the aqueous phase.

[0051] As a further improvement, the bottom of the vertical reaction chamber 20 may further include a sewage outlet 10, and the sewage outlet 10 is used for cleaning and sewage discharge after the reaction is completed.

[0052] As a further improvement, the lithium bicarbonate solution preparation device as a whole can be fixed by a group seat 9.

[0053] The organic phase of the organic phase feed port 8 is obtained by the following steps:

[0054] (1) One-step method for purifying the leachate: Take the leachate of the calcined iron lithium mica clinker, add sodium hydroxide and sodium carbonate, remove calcium, magnesium and aluminum impurities, and obtain a purified solution.

[0055] Preferably, in step (1), the amount of sodium hydroxide added is such that the pH value of the solution is raised to 10.0-12.0, the reaction temperature is 50-80° C., and the reaction time is 0.5-2 h.

[0056] (2) Multi-stage extraction of lithium: At least one of β-diketones, benzoyltrifluoroacetone, or nonyltrifluoroacetone is used as a lithium extractant, and one or more of tributyl phosphate, isooctyl alcohol, or methyl isobutyl ketone is added as a modifier to form an organic phase; the purified liquid and the organic phase are subjected to 2-5 stages of countercurrent extraction; and then washed with pure water or dilute hydrochloric acid for 1-6 stages to remove co-extracted impurities, thereby obtaining a lithium-loaded organic phase. In one embodiment, benzoyltrifluoroacetone is added with tributyl phosphate as a lithium extractant.

[0057] Preferably, in step (2), the organic phase comprises: a lithium extractant having a concentration of 0.5 to 1.5 mol / L, a modifier having a concentration of 10% to 30% (v / v), and a diluent of sulfonated kerosene or an alkane solvent. In one embodiment, the lithium extractant is nonyltrifluoroacetone having a concentration of 1 mol / L, the modifier is isooctyl alcohol having a concentration of 26% (v / v), and the diluent is sulfonated kerosene. The purified liquid and the organic phase are subjected to a four-stage countercurrent extraction; then, a five-stage washing is performed with pure water or dilute hydrochloric acid to remove co-extracted impurities and obtain a lithium-loaded organic phase. In one embodiment, the lithium concentration in the lithium-loaded organic phase is approximately 3 g / L. After multi-stage extraction of lithium, the temperature of the lithium-loaded organic phase is relatively high, generally reaching above 30 degrees Celsius, and an exothermic reaction occurs during the stripping process, causing the temperature to further increase, thereby reducing the stripping effect. Therefore, it is necessary to cool the organic phase during the stripping process. Generally, liquid carbon dioxide + organic phase + water phase, that is, a liquid-liquid-liquid reaction method, can be used. Although this method can reduce the overall reaction temperature by cooling the liquid carbon dioxide after vaporization, this liquid-liquid contact method is prone to uneven mixing, which in turn leads to low carbon dioxide utilization.

[0058] See Figure 2 As shown, the present invention further provides a method for preparing a lithium bicarbonate solution, comprising the following steps:

[0059] S1, control the flow rate ratio of the lithium-carrying organic phase, aqueous phase and gaseous carbon dioxide to be 10:

[0060] 4.0-4.5: 120-125 enter the vertical reaction chamber 20 from the organic phase feed port 8, the aqueous phase feed port 11 and the carbon dioxide input unit 12 respectively; wherein the gaseous carbon dioxide is produced by vaporization of liquid carbon dioxide after absorbing the heat of the reaction liquid in the vertical reaction chamber 20, wherein the reaction temperature of the vertical reaction chamber 20 is controlled at 20-40°C;

[0061] S2, controlling the organic phase, aqueous phase and gaseous carbon dioxide to stay in the vertical reaction chamber 20 for a predetermined time, fully stripping, and obtaining the stripped oil-water mixture from the first discharge port 5;

[0062] S3, passing the oil-water mixture after stripping into an oil-water separator for oil-water separation to obtain a lithium bicarbonate solution.

[0063] In step S1, the concentration of lithium in the lithium-loaded organic phase is 2.5 g / L to 3.5 g / L. In one embodiment, the concentration of lithium in the lithium-loaded organic phase is about 3 g / L.

[0064] The flow rate ratio of the organic phase, aqueous phase, and gaseous carbon dioxide has a significant impact on the final stripping efficiency. In one embodiment, in order to quickly achieve a stripping rate of more than 99%, preferably, the organic phase, aqueous phase, and gaseous carbon dioxide enter the vertical reaction chamber 20 from the organic phase feed port 8, the aqueous phase feed port 11, and the carbon dioxide input unit 12 at a flow rate ratio of 10:4.3:122.3, respectively. Experiments have shown that under this ratio, the stripping rate of the organic phase, aqueous phase, and gaseous carbon dioxide in the vertical reaction chamber 20 can reach more than 99% after staying in the vertical reaction chamber 20 for about 4 minutes, and can reach 99.9% after about 10 minutes.

[0065] As a further improvement, the reaction temperature of the vertical reaction chamber 20 is controlled at 25-30° C. At this temperature, the lithium bicarbonate solution can maintain a high solubility and can also prevent decomposition due to excessive temperature.

[0066] In step S2, the organic phase, aqueous phase, and gaseous carbon dioxide are controlled to stay in the vertical reaction chamber 20 for a predetermined time, specifically including:

[0067] The organic phase, aqueous phase and gaseous carbon dioxide are controlled to stay in the vertical reaction chamber 20 for 4 to 10 minutes.

[0068] Example 1

[0069] The lithium-loaded organic phase (3 g / L), aqueous phase and gaseous carbon dioxide are controlled to enter the vertical reaction chamber 20 from the organic phase feed port 8, the aqueous phase feed port 11 and the carbon dioxide input unit 12 according to a flow rate ratio of 10:4.3:122.3, respectively. The reaction temperature of the vertical reaction chamber 20 is controlled at 28°C ± 1; the organic phase, aqueous phase and gaseous carbon dioxide are controlled to stay in the vertical reaction chamber 20 for a predetermined time (3-40 minutes), and stripping is performed to obtain a stripped oil-water mixture from the first discharge port 5; the stripped oil-water mixture is passed into an oil-water separator for oil-water separation to obtain a lithium bicarbonate solution. The stripping rate and lithium no-load test data are shown in Table 1.

[0070] Table 1 is the test data table of Example 1

[0071]

[0072] As can be seen from Table 1, the stripping efficiency of the organic phase, aqueous phase, and gaseous carbon dioxide can reach over 99% after approximately 4 minutes of residence in the vertical reaction chamber 20, and 99.9% after approximately 10 minutes. Therefore, in this embodiment, the preferred residence time is approximately 5 minutes. Compared to conventional stripping times of 30 minutes, the present invention significantly improves stripping efficiency.

[0073] Comparative Example 1

[0074] The lithium-loaded organic phase (3 g / L), aqueous phase and gaseous carbon dioxide are controlled to enter the vertical reaction chamber 20 from the organic phase feed port 8, the aqueous phase feed port 11 and the carbon dioxide input unit 12 according to a flow rate ratio of 10:4.3:115, respectively. The reaction temperature of the vertical reaction chamber 20 is controlled at 28°C ± 1; the organic phase, aqueous phase and gaseous carbon dioxide are controlled to stay in the vertical reaction chamber 20 for a predetermined time (3-40 minutes), and stripping is performed to obtain a stripped oil-water mixture from the first discharge port 5; the stripped oil-water mixture is passed into an oil-water separator for oil-water separation to obtain a lithium bicarbonate solution. The test stripping rate and lithium no-load data are shown in Table 2.

[0075] Table 2 is the test data table of Comparative Example 1

[0076]

[0077] As can be seen from Table 2, the stripping efficiency of the organic phase, aqueous phase, and gaseous carbon dioxide only reaches over 99% after approximately 10 minutes of residence in the vertical reaction chamber 20, and only reaches 99.9% after approximately 30 minutes. Therefore, the above data demonstrates that the carbon dioxide ratio significantly influences the stripping time.

[0078] Comparative Example 2

[0079] The lithium-loaded organic phase (3 g / L), aqueous phase and gaseous carbon dioxide are controlled to enter the vertical reaction chamber 20 from the organic phase feed port 8, the aqueous phase feed port 11 and the carbon dioxide input unit 12 according to a flow rate ratio of 10:4.3:130, and the reaction temperature of the vertical reaction chamber 20 is controlled at 28°C ± 1; the organic phase, aqueous phase and gaseous carbon dioxide are controlled to stay in the vertical reaction chamber 20 for a predetermined time (3-40 minutes), and stripping is performed to obtain a stripped oil-water mixture from the first discharge port 5; the stripped oil-water mixture is passed into an oil-water separator for oil-water separation to obtain a lithium bicarbonate solution. The stripping rate and lithium no-load test data are shown in Table 3.

[0080] Table 3 is the test data table of Comparative Example 2

[0081]

[0082] As can be seen from Table 3, the stripping efficiency of the organic phase, aqueous phase, and gaseous carbon dioxide only reached over 99% after approximately 20 minutes of residence in the vertical reaction chamber 20, and 99.9% after approximately 30 minutes. This may be due to the excessively high carbon dioxide flow rate, which resulted in uneven distribution within the reaction system, leading to localized high or low carbon dioxide concentrations and requiring a longer time for equilibrium and stripping.

[0083] Example 2

[0084] The lithium-loaded organic phase (3 g / L), aqueous phase and gaseous carbon dioxide are controlled to enter the vertical reaction chamber 20 from the organic phase feed port 8, the aqueous phase feed port 11 and the carbon dioxide input unit 12 according to a flow rate ratio of 10:4.3:122.3, respectively. The reaction temperature of the vertical reaction chamber 20 is controlled at 35°C±1; the organic phase, aqueous phase and gaseous carbon dioxide are controlled to stay in the vertical reaction chamber 20 for a predetermined time (3-40 minutes), and stripping is performed to obtain a stripped oil-water mixture from the first discharge port 5; the stripped oil-water mixture is passed into an oil-water separator for oil-water separation to obtain a lithium bicarbonate solution. The stripping rate and lithium no-load test data are shown in Table 2.

[0085] Table 4 is the test data table of Example 2

[0086]

[0087] As can be seen from Table 4, the stripping rate of the organic phase, aqueous phase and gaseous carbon dioxide can reach above 99% when they stay in the vertical reaction chamber 20 for about 5 minutes, and can reach 99.9% when they stay in about 10 minutes.

[0088] Those skilled in the art will appreciate that the above embodiments are merely for the purpose of illustrating the present application and are not intended to limit the scope of the present application. Those skilled in the art may make other changes or modifications based on the above disclosure, and such changes or modifications are still within the scope of the present application.

Claims

1. A device for preparing a lithium bicarbonate solution, characterized in that: include Vertical reaction chamber; A temperature-control jacket is provided on the outer surface of the vertical reaction chamber, wherein a liquid carbon dioxide inlet is provided at the top of the temperature-control jacket and a gaseous carbon dioxide outlet is provided at the bottom; An exhaust port and a first discharge port are provided at the top of the vertical reaction chamber, and the height of the exhaust port is higher than that of the first discharge port; A carbon dioxide input unit, an organic phase feed port, and an aqueous phase feed port are provided at the bottom of the vertical reaction chamber, and the carbon dioxide input unit is connected to the gaseous carbon dioxide outlet; the liquid carbon dioxide inputted from the liquid carbon dioxide inlet absorbs the heat of the reaction liquid in the vertical reaction chamber and then vaporizes, and is then inputted from the carbon dioxide input unit into the vertical reaction chamber to mix with the organic phase and the aqueous phase and then strip; and The stirring unit is used to stir the solution in the vertical reaction chamber.

2. The preparation device of lithium bicarbonate solution according to claim 1, wherein: The stirring unit specifically includes from top to bottom: Motor; reducer; bearing housing; a main shaft disposed on the bearing seat; A plurality of turbine blades are arranged on the main shaft at intervals.

3. The preparation device of lithium bicarbonate solution according to claim 1, wherein: A packing layer is further provided at the lower portion of the first discharge port, and the packing layer is used to absorb solid particles and prevent solid impurities from flowing out of the first discharge port.

4. The preparation device of lithium bicarbonate solution according to claim 2, wherein: The vertical reaction chamber is provided with multiple layers of interconnected chambers along the height direction, and each layer of chambers is provided with a pair of turbine blades 7, and each layer of chambers is connected through a perforated plate.

5. The preparation device of lithium bicarbonate solution according to claim 4, characterized in that: The through holes between the orifice plates are staggered to form turbulent flow, thereby accelerating the mixing between the gaseous carbon dioxide and the liquid; the size of the through holes on the orifice plates is 1mm to 10mm.

6. The preparation device of lithium bicarbonate solution according to claim 1, characterized in that: A premixing chamber is further provided at the bottom of the vertical reaction chamber. The premixing chamber is provided below the carbon dioxide input unit and above the organic phase feed port and the aqueous phase feed port.

7. The preparation device of lithium bicarbonate solution according to claim 1, characterized in that: The bottom of the vertical reaction chamber may further include a sewage outlet.

8. The device for preparing lithium bicarbonate solution according to claim 1, wherein: The gaseous carbon dioxide is produced by vaporizing liquid carbon dioxide after absorbing heat from the reaction liquid in the vertical reaction chamber, so as to control the reaction temperature of the vertical reaction chamber at 20-40°C.

9. The device for preparing lithium bicarbonate solution according to claim 1, wherein: The gaseous carbon dioxide is produced by vaporizing liquid carbon dioxide after absorbing heat from the reaction liquid in the vertical reaction chamber, so as to control the reaction temperature of the vertical reaction chamber at 25-30°C.

10. The device for preparing lithium bicarbonate solution according to claim 1, wherein: It also includes an oil-water separator, which is connected to the first discharge port.

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