Device for removing crystal water from lithium hydroxide monohydrate

Abstract

The utility model discloses a device for removing crystal water from lithium hydroxide monohydrate, which comprises a jet mill main machine, a catcher and a finished product bin which are sequentially connected in series, the gas input end of the jet mill main machine is communicated with a power source, and the temperature of gas conveyed into the jet mill main machine by the power source is higher than 230 DEG C. The temperature of gas conveyed by the power source is set to be higher than 230 DEG C, the high-temperature drying and crushing process can be integrated in single equipment of the jet mill main machine, and high-temperature airflow simultaneously has dual functions of crushing kinetic energy transmission and crystal water removal, so that power can be provided for the jet mill main machine to realize crushing; and lithium hydroxide monohydrate can be effectively heated in the jet mill main machine. Compared with the drying and crushing separation process in the prior art, the process flow is greatly simplified, the occupied space of equipment is reduced, the time and loss of transferring materials among different equipment are reduced, the production efficiency is improved, meanwhile, the impurity mixing risk possibly caused by multiple times of transferring is also reduced, and the product purity is guaranteed.

Description

Technical Field

[0001] This utility model mainly relates to the field of dehydration device technology, and in particular to a dehydration device for removing water of crystallization from lithium hydroxide monohydrate. Background Technology

[0002] Anhydrous lithium hydroxide (molecular formula LiOH) is a white crystalline powder with extremely high hygroscopicity, absorbing carbon dioxide and moisture when exposed to air. Anhydrous lithium hydroxide has higher purity and stronger reactivity, and can be used to prepare high-purity lithium compounds, as well as as an additive in alkaline battery electrolytes.

[0003] Battery-grade anhydrous lithium hydroxide is typically prepared from lithium hydroxide monohydrate. Currently, there are two technical routes for preparing battery-grade anhydrous lithium hydroxide from lithium hydroxide monohydrate: the first route involves vacuum drying (rotary kiln or plowshare drying) to obtain anhydrous lithium hydroxide, followed by crushing using a pulverizing device (air jet mill or mechanical mill) to obtain micronized anhydrous lithium hydroxide; the second route involves crushing lithium hydroxide monohydrate using a pulverizing device (air jet mill or mechanical mill) to obtain micronized anhydrous lithium hydroxide, followed by vacuum drying (rotary kiln or plowshare drying) to obtain micronized anhydrous lithium hydroxide. Both of these technical routes involve two independent processes—drying and crushing—which need to be carried out in different equipment, resulting in relatively complex process flows and equipment structures. Utility Model Content

[0004] The technical problem to be solved by this utility model is how to simplify the process flow, combine the drying and crushing processes into one, and relatively simplify the equipment structure.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] An apparatus for removing water of crystallization from lithium hydroxide monohydrate includes an air jet mill, a collector, and a finished product bin connected in series. The gas input of the air jet mill is connected to a power source, and the gas supplied by the power source to the air jet mill has a temperature greater than 230°C. By setting the gas temperature supplied by the power source to greater than 230°C, high-temperature drying and pulverization processes can be integrated into a single air jet mill unit. The high-temperature gas flow simultaneously performs the dual functions of pulverization kinetic energy transfer and water of crystallization removal. It not only provides power to the air jet mill for pulverization but also effectively heats the lithium hydroxide monohydrate within the air jet mill. Compared to the existing technology that separates drying and crushing processes, this significantly simplifies the process flow, reduces equipment space requirements and material transfer time and losses between different devices, improves production efficiency, and also reduces the risk of impurity contamination due to multiple transfers, ensuring product purity.

[0007] As a further improvement of the above technical solution:

[0008] The inlet end of the jet mill main machine is connected with the raw material bin, and a valve for controlling the flow rate of the material is arranged between the jet mill main machine and the raw material bin. The valve can accurately control the feeding rate of the lithium hydroxide monohydrate raw material, so that the material processing capacity is accurately matched with the processing capacity of the jet mill main machine, effectively preventing the material accumulation or idle running phenomenon caused by the mismatch between the drying and crushing equipment in the prior art, and significantly improving the equipment operation efficiency.

[0009] The jet mill main machine is provided with a sensor one for acquiring the temperature information of the material in the cavity. The sensor one can monitor the temperature of the material in the jet mill main machine in real time, so that the operator can adjust the temperature and other parameters of the power source delivered gas in a timely manner according to the temperature change, ensure that the material is subjected to the removal of crystallization water reaction under the best temperature condition, avoid the adverse effects of too high or too low temperature on the product quality, and further protect the product quality.

[0010] The trap is provided with a first heating mechanism for providing heat energy for the upper half of the material in the cavity, and a second heating mechanism for providing heat energy for the lower half of the material in the cavity. The first heating mechanism and the second heating mechanism are both arranged as heating wires uniformly arranged around the trap cylinder wall. The temperature of the upper half of the trap is lower than that of the lower half. By arranging the heating mechanisms in the upper and lower two sections of the trap, and the temperature of the upper half of the trap being lower than that of the lower half, the rehydration of the lithium hydroxide anhydrous after dehydration during the discharging process can be effectively prevented. At the same time, the uniformly arranged heating wires can make the material in the trap be heated more uniformly, avoid the local overheating or overcooling, ensure the consistency of the material dehydration effect, and thus improve the product quality.

[0011] The trap is provided with a sensor two for acquiring the temperature information of the upper half of the material in the cavity, and a sensor three for acquiring the temperature information of the lower half of the material in the cavity. The sensor two and the sensor three monitor the temperature of the upper half and the lower half of the material in the trap, respectively, which can more comprehensively and accurately grasp the temperature distribution of the material in the trap, and provide more accurate data basis for subsequent temperature regulation. Through real-time monitoring of the temperature of the material at different positions, temperature abnormal points can be found in time, and corresponding control measures can be taken to ensure that the material in each region of the trap is at a suitable temperature, further improve the stability and consistency of the product quality, and also provide strong data support for optimizing the working state of the heating mechanism, which is conducive to reducing energy consumption and improving production efficiency.

[0012] The trap is also provided with a temperature controller one for regulating the power of the first heating mechanism, and a temperature controller two for regulating the power of the second heating mechanism; the temperature controller one is connected with the first heating mechanism and the sensor two respectively, and the temperature controller two is connected with the second heating mechanism and the sensor three respectively. The temperature controller one and the temperature controller two are arranged to realize the accurate regulation of the power of the heating mechanisms in the upper half and the lower half of the trap. According to the temperature information fed back by the sensor two and the sensor three, the temperature controller can automatically adjust the power of the corresponding heating mechanism, so that the temperature in the trap can always be maintained within the set suitable range. This automatic temperature regulation mode not only improves the automation degree of the production process, reduces manual intervention, and reduces operation errors, but also can effectively avoid the material quality problems and energy waste caused by temperature fluctuations, further improves the product quality and production efficiency, and also reduces the energy consumption cost in the production process, which has significant economic benefits and practical value.

[0013] The trap is also connected with a fan, and a sensor four for acquiring airflow temperature information is arranged between the trap and the fan. The arrangement of the fan can timely discharge the removed water vapor to prevent the water vapor from accumulating in the trap to cause the material to reabsorb moisture and affect the product quality. The monitoring of the sensor four on the airflow temperature can indirectly reflect the dehydration condition of the material in the trap and the working state of the fan.

[0014] The finished product bin is provided with a water cooling mechanism. The arrangement of the water cooling mechanism can rapidly cool the material after entering the finished product bin, so as to be directly used by the downstream equipment. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of a device for removing crystallization water of lithium hydroxide monohydrate.

[0016] In the figure, the numbers represent: 1, main machine; 11, sensor one; 2, trap; 21, first heating mechanism; 22, second heating mechanism; 23, sensor two; 24, sensor three; 25, temperature controller one; 26, temperature controller two; 27, fan; 28, sensor four; 29, cooler; 3, finished product bin; 4, power source; 5, raw material bin; 6, valve; 7, sensor five. DETAILED DESCRIPTION

[0017] The utility model will be further described in detail below in combination with the drawings and specific examples.

[0018] Embodiment

[0019] As Figure 1As shown, the device for removing crystal water of lithium hydroxide monohydrate in the embodiment comprises a raw material bin 5, an air flow mill main machine 1, a collector 2 and a finished product bin 3 connected in sequence. The raw material bin 5 is connected with the material inlet end of the air flow mill main machine 1, and a valve 6 for controlling the flow rate of the material is arranged between the air flow mill main machine 1 and the raw material bin 5. The gas input end of the air flow mill main machine 1 is connected with a power source 4, and the gas delivered by the power source 4 to the air flow mill main machine 1 has a temperature greater than 230℃. Specifically, the air flow mill main machine 1 has a heat preservation function, which can control the temperature of the material in the air flow mill main machine 1 within a reasonable range, thereby ensuring that the lithium hydroxide monohydrate can smoothly remove the crystal water. In addition, a sensor five 7 for obtaining gas temperature information is arranged between the air flow mill main machine 1 and the power source 4. By arranging the sensor five 7, the temperature of the gas output from the power source 4 can be monitored in real time, and the power source 4 can be adjusted in time according to the obtained temperature information, thereby ensuring that the gas temperature is always within the appropriate range. Through the above arrangement, high-temperature drying and crushing processes can be integrated in a single air flow mill main machine device. The high-temperature gas flow simultaneously undertakes the functions of delivering the crushing kinetic energy and removing the crystal water. It not only provides power for the air flow mill main machine to achieve crushing, but also effectively heats the lithium hydroxide monohydrate in the air flow mill main machine. Compared with the drying and crushing processes separated in the prior art, the process flow is greatly simplified, the occupied space of the equipment is reduced, and the time and loss of material transfer between different equipment are reduced, thereby improving the production efficiency and reducing the risk of impurities mixing due to multiple transfers, thereby ensuring the purity of the product. More specifically, the air flow mill main machine 1 is provided with a sensor one 11 for obtaining the temperature information of the material in the cavity. The power source 4 is a steam generator, and in other embodiments, a compressed air electric heater can also be selected. It should be noted that the air flow mill main machine 1, the collector 2, the finished product bin 3 and the power source 4 are all commercially available products, and their structures, connection methods and use methods all belong to the prior art, which will not be described here.

[0020] In the embodiment, the collector 2 is provided with a first heating mechanism 21 for providing heat energy to the upper half of the material in the cavity and a second heating mechanism 22 for providing heat energy to the lower half of the material in the cavity. The first heating mechanism 21 and the second heating mechanism 22 are both arranged as heating wires uniformly arranged around the cylinder wall of the collector 2. The collector 2 is provided with a sensor two 23 for obtaining the temperature information of the upper half of the material in the cavity and a sensor three 24 for obtaining the temperature information of the lower half of the material in the cavity. The collector 2 is further provided with a temperature controller one 25 for regulating the power of the first heating mechanism 21 and a temperature controller two 26 for regulating the power of the second heating mechanism 22; the temperature controller one 25 is connected with the first heating mechanism 21 and the sensor two 23 respectively, and the temperature controller two 26 is connected with the second heating mechanism 22 and the sensor three 24 respectively. The temperature of the upper half of the collector 2 is lower than that of the lower half.

[0021] In the embodiment, the collector 2 is also communicated with a fan 27, and a sensor four 28 for obtaining air flow temperature information is arranged between the collector 2 and the fan 27. Further, a cooler 29 is arranged between the fan 27 and the sensor four 28, and the cooler 29 is a commercially available product. Through the arrangement, the temperature of the water vapor can be reduced to a suitable range before entering the fan 27, so as to protect the fan 27 and avoid high-temperature damage.

[0022] In the embodiment, the finished product bin 3 is provided with a water cooling mechanism. The water cooling mechanism can be a water cooling jacket arranged on the finished product bin 3, which is connected with an external water cooling circulation mechanism to realize the cooling of the inner cavity of the finished product bin 3.

[0023] Although the present application has been disclosed with the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make many possible changes and modifications to the technical scheme of the present application, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical scheme of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application shall fall within the scope of protection of the technical scheme of the present application.

Claims

1. A device for removing crystal water from lithium hydroxide monohydrate, characterized by: The jet mill host (1), the collector (2) and the finished product bin (3) are connected in sequence, the gas input end of the jet mill host (1) is communicated with the power source (4), and the temperature of the gas delivered by the power source (4) to the jet mill host (1) is greater than 230 DEG C.

2. The apparatus for removing crystallization water from lithium hydroxide monohydrate according to claim 1, characterized by: The material inlet end of the jet mill host (1) is communicated with the raw material bin (5), and a valve (6) for controlling the material flow rate is arranged between the jet mill host (1) and the raw material bin (5).

3. The apparatus for removing crystallization water from lithium hydroxide monohydrate according to claim 1, characterized by: The jet mill host (1) is provided with a sensor one (11) for obtaining the temperature information of the material in the cavity.

4. The apparatus for removing crystallization water from lithium hydroxide monohydrate according to claim 1, characterized by: The collector (2) is provided with a first heating mechanism (21) for providing heat energy for the upper half of the material in the cavity and a second heating mechanism (22) for providing heat energy for the lower half of the material in the cavity.

5. The apparatus for removing crystallization water from lithium hydroxide monohydrate according to claim 4, characterized by: The first heating mechanism (21) and the second heating mechanism (22) are both arranged as heating wires uniformly arranged around the cylinder wall of the collector (2).

6. The apparatus for removing crystallization water from lithium hydroxide monohydrate according to claim 4 or 5, characterized by: The collector (2) is provided with a sensor two (23) for obtaining the temperature information of the upper half of the material in the cavity and a sensor three (24) for obtaining the temperature information of the lower half of the material in the cavity.

7. The apparatus for removing crystallization water from lithium hydroxide monohydrate according to claim 6, characterized by: The collector (2) is further provided with a temperature controller one (25) for regulating the power of the first heating mechanism (21) and a temperature controller two (26) for regulating the power of the second heating mechanism (22); the temperature controller one (25) is connected with the first heating mechanism (21) and the sensor two (23) respectively, and the temperature controller two (26) is connected with the second heating mechanism (22) and the sensor three (24) respectively.

8. The apparatus for removing crystallization water from lithium hydroxide monohydrate according to claim 7, characterized by: The temperature of the upper half of the collector (2) is lower than that of the lower half.

9. The apparatus for lithium hydroxide monohydrate water of crystallization removal according to claim 1, characterized by the fact that: The collector (2) is further communicated with a fan (27), and a sensor four (28) for obtaining the temperature information of the air flow is arranged between the collector (2) and the fan (27).

10. The apparatus for lithium hydroxide monohydrate water of crystallization removal according to claim 1, characterized by the fact that: The finished product bin (3) is provided with a water cooling mechanism.

Images