CN207507478U - A kind of preparation facilities of ternary precursor - Google Patents

Abstract

The utility model relates to a preparation device for a ternary precursor, comprising a reactor body and a reactor cover matched with it, and the reactor body is connected with two liquid alkali inlet pipes and a metal salt inlet pipe, wherein The liquid outlet of one liquid alkali inlet pipe is higher than the liquid outlet of the other liquid alkali inlet pipe; in the reactor body close to the reactor lid and the overflow port of the reactor body, there are liquid A level sensor, the overflow port is equipped with an overflow valve, the signal of the liquid level sensor is sent to the controller, and the controller controls the opening and closing of the overflow valve according to the signal. The utility model adopts two liquid alkali inlet pipes, one high and one low, one of which is mainly responsible for adjusting the pH value of the whole system, and the other liquid alkali inlet pipe is mainly responsible for direct contact with ammonia water and metal salts. Synthesis reaction, to achieve the purpose of significantly reducing crystal nuclei.

Description

A kind of preparation device of ternary precursor

technical field

The utility model relates to a preparation device of a ternary precursor.

Background technique

Nickel-cobalt-manganese ternary materials are widely used in lithium-ion batteries of digital electronic products, electric tools, electric bicycles, etc. At present, the production method of nickel-cobalt-manganese ternary precursor is mainly prepared by adding metal salt, liquid caustic soda and ammonia water into the reactor body at the same time. In the process of continuous preparation, due to the liquid feeding and discharging, the residence time of the materials in the reactor body varies, resulting in a normal distribution of the size of the final product. However, in the subsequent sintering process, the crystal nuclei (also called extremely small particles) are prone to overburning, which is what the cathode material manufacturers do not want to see. Precursor manufacturers generally use filter cloth to filter through or dry to separate part of the crystal nuclei. Although it can meet the requirements of cathode material manufacturers (D0>3μm), this will inevitably lead to material loss and yield decline, resulting in This is also the mainstream method of last resort.

Utility model content

In view of the above problems, the utility model provides a preparation device for a ternary precursor that can reduce crystal nuclei during the preparation process.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is: a preparation device of a ternary precursor, including a reactor body and a reactor cover matched with it, and the reactor body is connected with two liquid alkali inlet pipes and a metal salt liquid inlet pipe, wherein the liquid outlet of one liquid alkali liquid inlet pipe is higher than the liquid outlet of another liquid alkali liquid inlet pipe; The overflow port of the body is equipped with a liquid level sensor, and the overflow port is equipped with an overflow valve. The signal of the liquid level sensor is transmitted to the controller, and the controller controls the opening and closing of the overflow valve according to the signal. .

As a preference, the reactor body is provided with upper and lower two layers of stirring blades, the liquid outlet of one of the liquid alkali inlet pipes is close to the upper stirring blade, and the liquid outlet of the other liquid alkali inlet pipe is close to the lower stirring blade. paddle.

As a preference, the liquid outlet of the other liquid caustic soda inlet pipe is flush with the liquid outlet of the metal salt liquid inlet pipe.

Preferably, the reactor body is also connected with an ammonia water inlet pipe.

As preferably, when the liquid level sensor at the reaction kettle cover senses the reaction liquid, the sensor sends a signal to the controller to control the overflow valve to open; when the liquid level sensor at the overflow port does not sense the reaction liquid, the sensor Send a signal to the controller to control the overflow valve to close.

It can be seen from the above technical scheme that the utility model adopts two liquid alkali inlet pipes, one high and one low, one of which is mainly responsible for adjusting the pH value of the whole system, and the other liquid alkali inlet pipe is mainly responsible for adjusting the pH value of the whole system. In the direct synthesis reaction of ammonia water and metal salts, due to the decrease in the amount of liquid alkali directly participating in the reaction, the local pH becomes lower. Once new crystal nuclei are formed, they will grow rapidly at a significantly faster rate than before, thereby achieving a significant reduction in crystal nuclei. nuclear purpose.

Description of drawings

Fig. 1 is a structural schematic diagram of a preferred mode of the utility model.

Detailed ways

The utility model will be described in detail below in conjunction with FIG. 1 . Here, the schematic embodiment and description of the utility model are used to explain the utility model, but not as a limitation to the utility model.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is: a preparation device of a ternary precursor, comprising a reactor body 1 and a reactor cover 6 matched therewith, and the reactor body is connected with two liquid caustic inlets Liquid pipe 2 and a metal salt liquid inlet pipe 3, two liquid alkali liquid inlet pipes can pass into liquid alkali in the reactor body, and metal salt liquid inlet pipes can pass into metal salt in the reactor body; one of the liquid alkali The liquid outlet of the liquid inlet pipe is higher than the liquid outlet of another liquid alkali inlet pipe, and the liquid alkali that flows into the reactor body from one of the liquid alkali inlet pipes can adjust the pH value of the whole reaction system, and the other The liquid caustic soda that flows into the reaction kettle through the root liquid caustic inlet pipe can directly carry out a synthetic reaction with ammonia water and metal salts to realize the preparation of nickel-cobalt-manganese ternary precursors.

The utility model is provided with a liquid level sensor 8 at the place close to the reactor cover and the overflow port 7 of the reactor body in the reactor body, and an overflow valve 9 is installed at the overflow port, and the liquid level sensor The signal is sent to the controller 10, and the controller controls the opening and closing of the overflow valve according to the signal. Specifically, when the liquid level sensor at the cover of the reaction kettle senses the reaction liquid, the sensor sends a signal to the controller to control the overflow valve to open; when the liquid level sensor at the overflow port does not sense the reaction liquid, the The sensor sends a signal to the controller to control the overflow valve to close. The utility model adjusts the overflow valve from a normally open state to an intermittently open state. Since the overflow port is still some distance away from the reactor cover, closing the overflow port will not immediately cause the reactor tank to leak. Close the overflow port to prolong the residence time of small particles in the reactor. When the liquid level of the reactor rises to close to the lid of the reactor, open the overflow valve until the liquid level in the reactor is equal to the overflow valve, and then close the overflow valve, and so on. This significantly reduces the number of small particles in the final product, since the average residence time of the small particles in the reactor is significantly increased.

As preferably, the upper and lower layers of stirring paddles 4 are arranged in the reactor body to stir the reaction solution. The liquid outlet of one of the liquid alkali inlet pipes is close to the upper stirring blade, and the other liquid alkali inlet pipe The liquid outlet of the liquid alkali inlet pipe is close to the lower stirring paddle, so that the solution is more uniform; the liquid outlet of the other liquid alkali inlet pipe is flush with the liquid outlet of the metal salt liquid inlet pipe, which can ensure the rapid reaction in the lower part of the reaction kettle body. conduct. The reactor body of the utility model is also connected with an ammonia water inlet pipe 5, and ammonia water can be passed into the reactor body through the ammonia water inlet pipe.

The utility model adopts four liquid inlet pipes, which can realize the simultaneous transportation of liquid alkali, metal salt and ammonia water, and improve production efficiency. At the same time, the utility model utilizes two liquid alkali liquid inlet pipes with high and low heights, which can not only significantly reduce the crystal nuclei in the reaction process , can also make the synthesis process D0 greater than 1.5 μm at least, and then through the subsequent aging process, D0 can be increased to more than 3 μm.

The technical solutions provided by the embodiments of the present invention have been introduced in detail above. In this paper, specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to help understand the present invention. The principle of the embodiment; at the same time, for those of ordinary skill in the art, according to the embodiment of the present invention, there will be changes in the specific implementation and the scope of application. Utility model restrictions.

Claims (5)

1. a kind of preparation facilities of ternary precursor reacts kettle cover including reaction kettle body and with what it coordinated, it is characterised in that：Institute It states reaction kettle body and is communicated with two liquid caustic soda inlet tubes and a metal salt inlet tube, wherein the liquid outlet of a liquid caustic soda inlet tube is high In the liquid outlet of another liquid caustic soda inlet tube；In the reaction kettle body close to reaction kettle cover at and the overflow port of reaction kettle body at Liquid level sensor is both provided with, the overflow port is equipped with overflow valve, and the signal of the liquid level sensor is sent to controller, control Device processed controls the open and close of the overflow valve according to signal.

2. the preparation facilities of ternary precursor according to claim 1, it is characterised in that：It is provided in the reaction kettle body Lower two layers of stirring slurry, the liquid outlet of the wherein one liquid caustic soda inlet tube close to upper strata stirring slurry, another liquid caustic soda inlet tube Liquid outlet is close to lower floor's agitating paddle.

3. the preparation facilities of ternary precursor according to claim 2, it is characterised in that：Another liquid caustic soda inlet tube Liquid outlet is concordant with the liquid outlet of metal salt inlet tube.

4. the preparation facilities of ternary precursor according to claim 1, it is characterised in that：The reaction kettle body is also communicated with ammonia Water inlet tube.

5. the preparation facilities of ternary precursor according to claim 1, it is characterised in that：Level sensing at reaction kettle cover When device senses reaction solution, which transmits signals to controller control overflow valve and opens；Liquid level at overflow port passes When sensor does not sense reaction solution, which transmits signals to controller control overflow valve and closes.