Continuous pyrolysis device for lithium bicarbonate
By designing a continuous pyrolysis device for lithium bicarbonate and using the control of the discharge stop valve and purification stop valve, the continuous production and multiple purification of lithium carbonate slurry are achieved, and the problem that preparation and purification cannot be carried out continuously in the prior art is solved. Improves productivity and purity.
Patent Information
- Application Number
- CN202420420805.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-05
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-03-05
AI Technical Summary
In the prior art, the preparation and purification of lithium carbonate slurry cannot be carried out continuously, resulting in high equipment costs and low production efficiency.
A continuous pyrolysis device of lithium bicarbonate is designed. By controlling the closure of the discharge stop valve and the purification stop valve, selective discharge and purification of the lithium carbonate slurry is realized, and continuous production and purification are achieved.
The production efficiency of lithium carbonate slurry is improved, equipment costs are reduced, and secondary pollution of lithium hydrogen carbonate solution is avoided by impurities, ensuring the high purity of lithium carbonate slurry.
Smart Images
Figure CN222427955U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of chemical production, and specifically relates to a lithium bicarbonate continuous pyrolysis device. Background Art
[0002] Lithium bicarbonate solution is usually produced by thermal decomposition method, and lithium carbonate slurry is collected and used for later use. However, since lithium bicarbonate solution generally contains a small amount of impurities, the produced lithium carbonate slurry needs to be purified in order to remove these impurities.
[0003] Currently, the preparation and purification of lithium carbonate slurry cannot be carried out continuously, and usually at least two sets of production processes are used. Not only is the equipment cost high, but the preparation and purification of lithium carbonate slurry cannot be carried out simultaneously, resulting in low production efficiency. Utility Model Content
[0004] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a lithium bicarbonate continuous pyrolysis device, which selectively discharges and purifies lithium carbonate slurry by controlling the closing of the discharge stop valve and the purification stop valve. At the same time, the production and multiple purifications of lithium carbonate slurry can be carried out continuously, thereby improving the production efficiency of lithium carbonate slurry.
[0005] The specific technical solution adopted by the utility model is:
[0006] A lithium bicarbonate continuous pyrolysis device comprises a lithium bicarbonate feed tank, a continuous decomposition tower and a pyrolysis slurry storage tank, wherein the output end of the lithium bicarbonate feed tank is connected to the raw material input end of the continuous decomposition tower, and the slurry output end of the continuous decomposition tower is connected to the input end of the pyrolysis slurry storage tank; the device also comprises a first cooler, wherein the input end of the first cooler is connected to the slurry output end of the continuous decomposition tower, and the output end of the first cooler is connected to the purified liquid input end of the continuous decomposition tower; a discharge stop valve is arranged between the slurry output end of the continuous decomposition tower and the input end of the pyrolysis slurry storage tank, and a purification stop valve is arranged between the slurry output end of the continuous decomposition tower and the input end of the first cooler; the continuous decomposition tower selects purification or discharge of lithium carbonate slurry by closing the discharge stop valve and the purification stop valve.
[0007] The continuous decomposition tower includes a first-stage decomposition tower, a purification tower and a final-stage decomposition tower. The raw material input end of the first-stage decomposition tower is the raw material input end of the continuous decomposition tower, the slurry output end of the first-stage decomposition tower is connected to the raw material input end of the purification tower, the output end of the purification tower is respectively connected to the impurity recovery tank and the raw material input end of the final-stage decomposition tower by means of a filter, the slurry output end of the final-stage decomposition tower is the slurry output end of the continuous decomposition tower, and the purified liquid input end of the purification tower is the purified liquid input end of the continuous decomposition tower.
[0008] A second cooler is also arranged between the slurry output end of the first-stage decomposition tower and the raw material input end of the purification tower. The heat exchange port of the first cooler is respectively connected to the circulating water input pipe and the circulating water output pipe, and the heat exchange port of the second cooler is respectively connected to the circulating water input pipe and the circulating water output pipe.
[0009] The carbon dioxide emission end of the first-stage decomposition tower is connected to the gas input end of the purification tower, and the carbon dioxide emission ends of the purification tower and the final-stage decomposition tower are respectively connected to the tail gas treatment system.
[0010] The carbon dioxide discharge end of the purification tower is provided with an exhaust stop valve.
[0011] The lithium bicarbonate continuous pyrolysis device also includes a heater, the aqueous solution output end of the first-stage decomposition tower and the aqueous solution output end of the final-stage decomposition tower are respectively connected to the input end of the heater, the output end of the heater is respectively connected to the heat source input end of the first-stage decomposition tower and the heat source input end of the final-stage decomposition tower, and the heat exchange port of the heater is respectively connected to the steam input pipe and the condensed water output pipe.
[0012] The beneficial effects of the utility model are:
[0013] The utility model also has a first cooler connected to the slurry output end of the continuous decomposition tower to form a reflux with the continuous decomposition tower, and selectively discharges and purifies the lithium carbonate slurry by controlling the closing of the discharge stop valve and the purification stop valve, and can simultaneously realize continuous production and multiple purifications of the lithium carbonate slurry, thereby improving the production efficiency of the lithium carbonate slurry. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the process flow of the utility model. DETAILED DESCRIPTION
[0015] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:
[0016] As shown in the figure, the utility model provides a lithium bicarbonate continuous pyrolysis device, including a lithium bicarbonate feed tank, a continuous decomposition tower and a pyrolysis slurry storage tank, the output end of the lithium bicarbonate feed tank is connected to the raw material input end of the continuous decomposition tower, the slurry output end of the continuous decomposition tower is connected to the input end of the pyrolysis slurry storage tank, and also includes a first cooler, the input end of the first cooler is connected to the slurry output end of the continuous decomposition tower, the output end of the first cooler is connected to the purified liquid input end of the continuous decomposition tower, a discharge stop valve is arranged between the slurry output end of the continuous decomposition tower and the input end of the pyrolysis slurry storage tank, a purification stop valve is arranged between the slurry output end of the continuous decomposition tower and the input end of the first cooler, and the continuous decomposition tower selects the purification or discharge of the lithium carbonate slurry by closing the discharge stop valve and the purification stop valve.
[0017] The current preparation and purification of lithium carbonate slurry cannot be carried out continuously, and usually at least two sets of production processes are used. Not only is the equipment cost high, but the preparation and purification of lithium carbonate slurry cannot be carried out simultaneously, and the production efficiency is low. Therefore, the utility model is also connected to a first cooler at the slurry output end of the continuous decomposition tower to form a reflux with the continuous decomposition tower. When there is no need to purify the lithium carbonate slurry, the discharge stop valve is opened, the purification stop valve is closed, and the lithium carbonate slurry output from the slurry output end of the continuous decomposition tower directly flows into the pyrolysis slurry storage tank for storage and standby; when it is necessary to purify the lithium carbonate slurry, the discharge stop valve is closed, the purification stop valve is opened, the lithium carbonate slurry is cooled by the first cooler and refluxed to the continuous decomposition tower. Since the continuous decomposition tower is filled with Carbon dioxide is repelled and the temperature of lithium carbonate slurry is relatively low, lithium carbonate slurry will produce carbonization reaction, regenerate lithium bicarbonate solution, and after filtering the insoluble impurities in the lithium bicarbonate solution, a high-purity lithium bicarbonate solution can be generated. As the temperature of the high-purity lithium bicarbonate solution rises, the lithium bicarbonate solution continues to pyrolyze to form lithium carbonate slurry. This process can be repeated until the purity of the lithium carbonate slurry meets the requirements. At this time, the discharge stop valve is opened, the purification stop valve is closed, and the lithium carbonate slurry is then flowed into the pyrolysis slurry storage tank for storage and standby. Through the above equipment and production process, the production and multiple purification of lithium carbonate slurry can be carried out continuously, which improves the production efficiency of lithium carbonate slurry.
[0018] The continuous decomposition tower comprises a first-stage decomposition tower, a purification tower and a final-stage decomposition tower. The raw material input end of the first-stage decomposition tower is the raw material input end of the continuous decomposition tower, the slurry output end of the first-stage decomposition tower is connected to the raw material input end of the purification tower, the output end of the purification tower is respectively connected to the impurity recovery tank and the raw material input end of the final-stage decomposition tower by means of a filter, the slurry output end of the final-stage decomposition tower is the slurry output end of the continuous decomposition tower, and the purified liquid input end of the purification tower is the purified liquid input end of the continuous decomposition tower. Since impurities will be generated during the purification process of lithium carbonate slurry, in order to avoid re-contamination of the lithium bicarbonate solution by these impurities, the utility model performs the preparation and purification of lithium carbonate slurry in different equipments. The first-stage decomposition tower always performs the preparation of lithium carbonate slurry, and the initial lithium bicarbonate solution is pyrolyzed into lithium carbonate slurry which is input into the purification tower. There is no input of heat source in the purification tower, so its internal temperature is relatively low, and the lithium carbonate slurry can be reversely reacted to generate lithium bicarbonate solution. After the lithium carbonate slurry is purified by carbonization reaction in the purification tower, the fixed impurities are discharged by a filter and collected in the impurity recovery tank, and the purified lithium bicarbonate solution is input into the final decomposition tower, and the lithium bicarbonate solution is re-pyrolyzed into lithium carbonate slurry by the final decomposition tower. At this time, the discharge stop valve and the purification stop valve can still be used to select the discharge or purification of the lithium carbonate slurry. If purified, the lithium carbonate slurry re-enters the purification tower for purification with the help of the first cooler. Through the above equipment and production process, not only can the production and multiple purification of lithium carbonate slurry be carried out continuously, thereby improving the production efficiency of lithium carbonate slurry, but also the secondary pollution of the lithium bicarbonate solution raw material by impurities is avoided, thereby further ensuring the purity of the lithium carbonate slurry.
[0019] A second cooler is also provided between the slurry output end of the first-stage decomposition tower and the raw material input end of the purification tower. The heat exchange port of the first cooler is respectively connected to the circulating water input pipe and the circulating water output pipe, and the heat exchange port of the second cooler is respectively connected to the circulating water input pipe and the circulating water output pipe. In order to promote the carbonization reaction of the lithium carbonate slurry generated by the first-stage decomposition tower in the purification tower, the utility model is also provided with a second cooler. The lithium carbonate slurry generated by the first-stage decomposition tower is cooled by the second cooler to promote the carbonization reaction. At the same time, the utility model adopts a circulating water cooler to recover the heat energy generated by the lithium carbonate slurry.
[0020] The carbon dioxide emission end of the first-stage decomposition tower is connected to the gas input end of the purification tower, and the carbon dioxide emission ends of the purification tower and the final decomposition tower are respectively connected to the tail gas treatment system. In order to promote the carbonization reaction of the lithium carbonate slurry in the purification tower, the utility model inputs the carbon dioxide generated in the first-stage decomposition tower into the purification tower. At the same time, in order to avoid the danger of excessive internal pressure caused by excessive carbon dioxide concentration in the purification tower, a carbon dioxide emission end is also provided at the purification tower to release high-concentration carbon dioxide.
[0021] The carbon dioxide discharge end of the purification tower is provided with an exhaust stop valve, which is controlled according to the carbon dioxide content in the purification tower to ensure that the carbon dioxide in the purification tower is always in a high but not dangerous concentration state.
[0022] The lithium bicarbonate continuous pyrolysis device also includes a heater. The aqueous solution output end of the first-stage decomposition tower and the aqueous solution output end of the final decomposition tower are respectively connected to the input end of the heater, and the output end of the heater is respectively connected to the heat source input end of the first-stage decomposition tower and the heat source input end of the final decomposition tower. The heat exchange port of the heater is respectively connected to the steam input pipe and the condensed water output pipe. In order to ensure the generation of lithium carbonate slurry in the first-stage decomposition tower and the final decomposition tower, it is necessary to promote the forward pyrolysis reaction of the lithium bicarbonate solution. Therefore, it is necessary to use a heater to keep the first-stage decomposition tower and the final decomposition tower at a higher temperature all the time.
[0023] The discharge end of the pyrolysis slurry storage tank is also connected to a flash tank. Since the pyrolysis slurry in the pyrolysis slurry storage tank contains some water and a trace amount of lithium bicarbonate solution, the purity of lithium carbonate can be further improved after flash evaporation in the flash tank, and it can also play a drying role.
Claims
1. A lithium bicarbonate continuous pyrolysis device, comprising a lithium bicarbonate feed tank, a continuous decomposition tower and a pyrolysis slurry storage tank, wherein the output end of the lithium bicarbonate feed tank is connected to the raw material input end of the continuous decomposition tower, and the slurry output end of the continuous decomposition tower is connected to the input end of the pyrolysis slurry storage tank, characterized in that: It also includes a first cooler, the input end of the first cooler is connected to the slurry output end of the continuous decomposition tower, the output end of the first cooler is connected to the purified liquid input end of the continuous decomposition tower, a discharge stop valve is arranged between the slurry output end of the continuous decomposition tower and the input end of the pyrolysis slurry storage tank, a purification stop valve is arranged between the slurry output end of the continuous decomposition tower and the input end of the first cooler, and the continuous decomposition tower selects the purification or discharge of the lithium carbonate slurry by means of the closure of the discharge stop valve and the purification stop valve.
2. A lithium bicarbonate continuous pyrolysis device according to claim 1, characterized in that: The continuous decomposition tower includes a first-stage decomposition tower, a purification tower and a final-stage decomposition tower. The raw material input end of the first-stage decomposition tower is the raw material input end of the continuous decomposition tower, the slurry output end of the first-stage decomposition tower is connected to the raw material input end of the purification tower, the output end of the purification tower is respectively connected to the impurity recovery tank and the raw material input end of the final-stage decomposition tower by means of a filter, the slurry output end of the final-stage decomposition tower is the slurry output end of the continuous decomposition tower, and the purified liquid input end of the purification tower is the purified liquid input end of the continuous decomposition tower.
3. A lithium bicarbonate continuous pyrolysis device according to claim 2, characterized in that: A second cooler is also arranged between the slurry output end of the first-stage decomposition tower and the raw material input end of the purification tower. The heat exchange port of the first cooler is respectively connected to the circulating water input pipe and the circulating water output pipe, and the heat exchange port of the second cooler is respectively connected to the circulating water input pipe and the circulating water output pipe.
4. A lithium bicarbonate continuous pyrolysis device according to claim 2, characterized in that: The carbon dioxide emission end of the first-stage decomposition tower is connected to the gas input end of the purification tower, and the carbon dioxide emission ends of the purification tower and the final-stage decomposition tower are respectively connected to the tail gas treatment system.
5. A lithium bicarbonate continuous pyrolysis device according to claim 4, characterized in that: The carbon dioxide discharge end of the purification tower is provided with an exhaust stop valve.
6. A lithium bicarbonate continuous pyrolysis device according to claim 2, characterized in that: The lithium bicarbonate continuous pyrolysis device also includes a heater, the aqueous solution output end of the first-stage decomposition tower and the aqueous solution output end of the final-stage decomposition tower are respectively connected to the input end of the heater, the output end of the heater is respectively connected to the heat source input end of the first-stage decomposition tower and the heat source input end of the final-stage decomposition tower, and the heat exchange port of the heater is respectively connected to the steam input pipe and the condensed water output pipe.