Pyrolysis device for purifying lithium carbonate

Abstract

The utility model discloses a pyrolysis device for purifying lithium carbonate. The pyrolysis device comprises a tank body, a tank cover and a heat exchange tube, the tank cover covers the tank body, the tank cover is provided with a feed port, a steam inlet and a steam outlet, the bottom of the tank body is provided with a discharge port, the discharge port is connected with a first valve, and the feed port is connected with a second valve; the heat exchange pipe is located in the tank body, the air inlet end of the heat exchange pipe is communicated with the steam inlet, and the air outlet end of the heat exchange pipe is communicated with the steam outlet. The lithium bicarbonate in the tank body is heated through the steam heat exchange pipeline formed by the steam inlet, the heat exchange pipe and the steam outlet, so that the heat exchanger is effectively prevented from being blocked due to the fact that lithium bicarbonate solution is heated to separate out lithium carbonate, the time consumption caused by pipeline dredging is reduced, and the pyrolysis efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium carbonate purification production equipment, in particular to a pyrolysis device for lithium carbonate purification. Background Art

[0002] As a basic lithium salt, lithium carbonate is an important raw material for lithium-ion batteries. Lithium metal is mainly extracted from salt lakes, ores and waste batteries to synthesize lithium carbonate. However, the prepared lithium carbonate has low purity and high impurity content, and cannot be directly used as the positive electrode material of lithium-ion batteries. It generally needs to be purified to make the purity and impurity content meet the battery-grade standards.

[0003] Hydrogenation pyrolysis is an important method for purifying industrial-grade lithium carbonate to prepare battery-grade lithium carbonate. Compared with other methods, this method has the advantages of simple operation and environmentally friendly process. However, this method is to pass steam and lithium bicarbonate solution into a tubular heat exchanger, and then enter the pyrolysis kettle after heating. The lithium bicarbonate solution is easily blocked by heat in the heat exchanger, and it is difficult to clear it, resulting in low pyrolysis efficiency and increased production costs. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a pyrolysis device for purifying lithium carbonate.

[0005] The utility model provides a pyrolysis device for purifying lithium carbonate, comprising: a tank body, a tank cover and a heat exchange tube; the tank cover is closed on the tank body, and a feed port, a steam inlet port and a steam outlet port are arranged on the tank cover; a discharge port is arranged at the bottom of the tank body, the discharge port is connected with a first valve, and the feed port is connected with a second valve; the heat exchange tube is located inside the tank body, the inlet end of the heat exchange tube is connected with the steam inlet port, and the outlet end of the heat exchange tube is connected with the steam outlet port.

[0006] Preferably, the heat exchange tube is a tube body that is continuously bent into a plurality of S-shaped bent tubes connected end to end.

[0007] Preferably, the S-shaped bend is provided with fins.

[0008] Preferably, the tank body is coated with a thermal insulation layer.

[0009] Preferably, a pressure reducing valve is also provided on the tank cover.

[0010] Preferably, a circulating feed port is provided at the top of one side of the tank body; the first valve is a three-way valve, one outlet of the three-way valve is connected to a discharge pipe, the other discharge port of the three-way valve is connected to a circulating pump, the circulating pump is connected to a circulating pipe, and the circulating pipe is connected to the circulating feed port.

[0011] In the utility model, the pyrolysis device for purifying lithium carbonate proposed heats the lithium bicarbonate in the tank body through a steam heat exchange pipeline formed by a steam inlet, a heat exchange tube and a steam outlet, thereby effectively avoiding the lithium bicarbonate solution from precipitating lithium carbonate due to heat and clogging the heat exchanger, reducing the time consumption caused by unblocking the pipeline, and improving the pyrolysis efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a pyrolysis device for purifying lithium carbonate in one embodiment of the present invention.

[0013] Figure 2 This is a schematic structural diagram of a pyrolysis device for purifying lithium carbonate in another embodiment of the present invention. DETAILED DESCRIPTION

[0014] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0015] Reference Figure 1 The utility model provides a pyrolysis device for purifying lithium carbonate, comprising: a tank body 1, a tank cover 2 and a heat exchange tube 3;

[0016] The tank cover 2 is covered on the tank body 1, and is provided with a feed inlet 21, a steam inlet 22 and a steam outlet 23. The bottom of the tank body 1 is provided with a discharge port 11, the discharge port 11 is connected to a first valve, and the feed inlet 21 is connected to a second valve.

[0017] The heat exchange tube 3 is located inside the tank body 1 , the air inlet end of the heat exchange tube 3 is communicated with the steam air inlet 22 , and the air outlet end of the heat exchange tube 3 is communicated with the steam air outlet 23 .

[0018] The utility model heats the lithium bicarbonate in the tank body 1 through the steam heat exchange pipe 3 formed by the steam inlet 22, the heat exchange pipe 3 and the steam outlet 23, effectively avoiding the lithium bicarbonate solution from precipitating lithium carbonate due to heat and clogging the heat exchanger, reducing the time consumption caused by unblocking the pipe, and improving the pyrolysis efficiency.

[0019] Reference Figure 2 In this embodiment, a circulating feed port 12 is provided at the top of one side of the tank body 1; the first valve is a three-way valve, one outlet of the three-way valve is connected to a discharge pipe, the other discharge port 11 of the three-way valve is connected to a circulating pump 5, the circulating pump 5 is connected to a circulating pipe, and the circulating pipe is connected to the circulating feed port 12.

[0020] In this embodiment, the solution at the bottom of the tank body 1 can be forced to enter the tank body 1 from the circulation feed port 12 for circulation, thereby increasing the contact area and contact time between the lithium bicarbonate solution and the heat exchange tube 3, thereby further increasing the heating rate of the lithium bicarbonate solution and improving the pyrolysis efficiency.

[0021] In order to further increase the contact area between the lithium bicarbonate solution and the heat exchange tube 3, in the present embodiment, the heat exchange tube 3 is a tube body continuously bent into a plurality of S-shaped bends connected end to end.

[0022] Of course, the heat exchange tube 3 in this embodiment is made of metal with high thermal conductivity.

[0023] In a further embodiment, the S-shaped elbow is provided with fins to increase the heat exchange area with the solution, further increase the heating rate of the lithium bicarbonate solution, and improve the pyrolysis efficiency.

[0024] In order to reduce the heat loss of the tank body 1 and ensure the temperature inside the tank body 1 is stable, in this embodiment, the tank body 1 is coated with a heat-insulating layer.

[0025] Specifically, the thermal insulation layer is a thermal insulation cotton layer.

[0026] In order to facilitate the discharge of the lithium carbonate solution in the tank body 1 , in this embodiment, a pressure reducing valve 4 is further provided on the tank cover 2 .

[0027] In a further embodiment, the pressure reducing valve 4 is connected to a carbon dioxide recovery pipe to recover carbon dioxide for utilization.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pyrolysis device for purifying lithium carbonate, characterized in that: include: A tank body (1), a tank cover (2) and a heat exchange tube (3); the tank cover (2) is covered on the tank body (1), and a feed port (21), a steam inlet port (22) and a steam outlet port (23) are provided on the tank cover (2); a discharge port (11) is provided at the bottom of the tank body (1), the discharge port (11) is connected to a first valve, and the feed port (21) is connected to a second valve; the heat exchange tube (3) is located inside the tank body (1), the inlet end of the heat exchange tube (3) is connected to the steam inlet port (22), and the outlet end of the heat exchange tube (3) is connected to the steam outlet port (23).

2. The pyrolysis device for purifying lithium carbonate according to claim 1, characterized in that: The heat exchange tube (3) is a tube body that is continuously bent into a plurality of S-shaped bent tubes connected end to end.

3. The pyrolysis device for purifying lithium carbonate according to claim 2, characterized in that: The S-shaped elbow is provided with fins.

4. The pyrolysis device for purifying lithium carbonate according to claim 1, characterized in that: The tank body (1) is coated with a heat-insulating layer.

5. The pyrolysis device for purifying lithium carbonate according to claim 1, characterized in that: The tank cover (2) is also provided with a pressure reducing valve (4).

6. The pyrolysis device for purifying lithium carbonate according to any one of claims 1 to 5, characterized in that: A circulating feed port (12) is provided at the top of one side of the tank body (1); the first valve is a three-way valve, one outlet of the three-way valve is connected to a discharge pipe, the other discharge port (11) of the three-way valve is connected to a circulating pump (5), the circulating pump (5) is connected to a circulating pipe, and the circulating pipe is connected to the circulating feed port (12).

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