CN221965239U - A particle forming device for preparing lithium extraction adsorbent based on precipitation method - Google Patents

Abstract

The utility model provides a particle forming device for extracting a lithium adsorbent based on a precipitation method, which mainly comprises an air mixing type stirring kettle, a liquid drop forming unit and a liquid drop precipitation tank, wherein the air mixing type stirring kettle consists of an anchor stirrer arranged in a stirring kettle shell, a motor for driving the stirrer to rotate and an air compressor, wherein the tail end of the outer edge of the anchor stirrer is provided with a bubble generating device and is communicated with the output end of an air input pipeline in the anchor stirrer, and air is input into the bubble generator through the air input pipeline by the air compressor. According to the utility model, micron bubbles are generated in situ through high-speed shearing force in the stirring process of the air mixing type stirring kettle, the feed liquid is stirred together with the micron bubbles and then is output to the liquid drop forming unit, and the inorganic powder in the feed liquid is prevented from blocking the liquid drop nozzle to the greatest extent through the secondary stirring effect of the micron bubbles in the feed liquid.

Description

A particle forming device for preparing lithium extraction adsorbent based on precipitation method

Technical Field

The utility model belongs to the field of a device for preparing adsorbent particles, and relates to a device for preparing lithium-extracting adsorbent particles based on a precipitation method.

Background Art

Generally speaking, adsorbent particles can be in different shapes such as spheres, columns, strips, etc., which are extruded through single or multiple molds. However, when the core of the adsorbent particles is an inorganic powder adsorbent material, it is usually necessary to use an adhesive to bond the inorganic powder adsorbent material together to prevent the inorganic powder from diffusing into the solution phase during the adsorption process, and it is also beneficial to recover the adsorbent particles. The main methods for manufacturing adsorbent particles include precipitation, freeze-drying and co-extrusion molding. Among these methods, precipitation has attracted widespread attention in the industry due to its ease of operation and the advantage of being able to obtain a hollow structure.

When pure resin adsorbent particles are prepared by precipitation method, the traditional process mainly requires the simple droplet forming mold, which is mainly square droplet holes. The droplet aperture is controlled by the size of the square droplet hole to ensure that the droplet hole is not blocked as much as possible. However, in comparison, when inorganic powder adsorbent particles are prepared by precipitation method, the conventional square droplet hole is prone to powder blockage, which seriously affects the forming morphology of the droplet and the overall adsorption effect of the adsorbent particles is deteriorated; while the circular droplet hole has a higher blockage rate when forming spherical droplets of the same particle size as the square droplet hole.

At present, inorganic powder adsorbent particles are mainly used in the lithium battery industry. The most representative ones are lithium-extraction adsorbents that can selectively extract lithium ions from salt lake brine, underground brine, oil and gas field wastewater, and waste battery recovery tail water. Lithium-extraction adsorbents are usually divided into three types: aluminum adsorbents, manganese adsorbents, and titanium adsorbents. The particle diameter ranges from 50nm to 500μm, and the particle shape is mainly flake, square or diamond.

Utility Model Content

In order to solve the problems raised by the above-mentioned background technology, the utility model provides a particle forming device for preparing lithium extraction adsorbent based on the precipitation method. During the stirring process of the air mixing stirring kettle, the utility model will generate micron bubbles in situ through high-speed shear force. The feed liquid is stirred together with the micron-level bubbles and then output to the droplet forming unit. The secondary stirring effect of the micron-level bubbles in the feed liquid can avoid the inorganic powder in the feed liquid from clogging the droplet nozzle to the greatest extent.

In order to achieve the above-mentioned purpose, the present invention adopts a technical solution consisting of the following technical measures.

A particle forming device for preparing a lithium extraction adsorbent based on a precipitation method is mainly composed of an air mixing stirring kettle, a droplet forming unit and a droplet precipitation tank.

The air mixing type stirring kettle is composed of an anchor stirrer arranged in the stirring kettle shell, a motor driving the stirrer to rotate, and an air compressor. An air input pipeline is passed through the anchor stirrer, and the input end of the air input pipeline is connected to the air delivery end of the air compressor. A bubble generating device is arranged at the outer end of the anchor stirrer and is connected to the output end of the air input pipeline in the anchor stirrer. Air is input from the air compressor through the air input pipeline into the bubble generator. The bubble generator is a hollow cylindrical body connected to the outside world and has a plurality of nanopores.

The droplet forming unit is composed of a liquid infusion pipeline and a droplet nozzle arranged on the liquid infusion pipeline, and the liquid infusion pipeline is connected to a liquid outlet arranged at the bottom of the air mixing stirring kettle;

The droplet precipitation tank is placed below the droplet nozzle and is used to receive the droplets formed by the droplet nozzle. The droplets are rapidly precipitated by the non-solvent liquid in the droplet precipitation tank to prepare lithium-extracting adsorbent particles.

The inventive point of the utility model is that air is input from an air compressor into a bubble generator through an air input pipe. Since the bubble generator is fixed to the outer edge end of the anchor agitator, it rotates along with the anchor agitator. During the rotation, the air inside the bubble generator is thrown into the liquid in the stirring kettle through nanopores to form micron-sized bubbles. The liquid is stirred together with the micron-sized bubbles and then output to a droplet forming unit. The secondary stirring effect of the micron-sized bubbles in the liquid can avoid the inorganic powder in the liquid from clogging the circular hole droplet nozzle to the greatest extent.

In one of the technical solutions, in order to better connect the input end of the air input pipe with the air delivery end of the air compressor, a hollow shaft motor with an air injection port can be selected according to the prior art, and the anchor agitator with an air input pipe can be driven to rotate by the hollow shaft motor, and air is input into the air input pipe of the anchor agitator through the air injection port of the hollow shaft motor.

In one of the technical solutions, in order to better balance the air pressure of the air-mixing stirred tank, the air inlet end of the air compressor is connected to the interior of the stirred tank shell; further, a constant pressure port is provided on the air-mixing stirred tank to allow dehydrated air to enter.

In one of the technical solutions, in order to facilitate maintenance of the bubble generator, the bubble generator is threadedly connected to the outer edge end of the anchor agitator; further, a sealing ring is provided at the threaded connection to prevent the slurry from entering the hollow interior of the bubble generator.

In one of the technical solutions, in order to produce micron-sized bubbles with better secondary stirring effect, the nanopores on the bubble generator are tapered holes that are wide inside and narrow outside, and the diameter at the narrowest point is 180 to 220 nm. It should be noted that although nanopores narrower than the above are conducive to generating nano-sized bubbles with better secondary stirring effect, the cost of the bubble generator and the air compressor will increase significantly.

In one of the technical solutions, a heat-insulating shell layer into which a constant-temperature liquid circulation can be injected is arranged outside the stirring tank shell, and a constant-temperature liquid circulation inlet and a constant-temperature liquid circulation outlet are respectively arranged.

In one of the technical solutions, the liquid infusion pipeline of the droplet forming unit is a one-way pipeline with a closed end, or an annular pipeline with an infusion channel opening.

In one of the technical solutions, in order to maintain the secondary stirring effect of the micron-sized bubbles, the infusion pipeline of the droplet forming unit is arranged in a spiral shape.

In one of the technical solutions, the droplet nozzle is a circular mouth.

In one of the technical solutions, in order to facilitate the regulation of the particle forming shape and further improve the droplet forming production efficiency, the droplet nozzle is composed of a conical connecting seat and a nozzle tube. The wide end of the conical connecting seat is connected to the infusion pipeline to facilitate the pressurized spraying of the liquid, and the narrow end is fixedly connected to the nozzle tube. The particle forming shape is regulated by replacing the nozzle tube; the nozzle tube has a circular or square mouth, a diameter of 50 to 1500 μm, and a length of 0.5 to 5.0 cm.

It should be noted that the above-mentioned droplet nozzle is a technical solution consisting of a conical connecting seat and a nozzle tube. Under the premise that there are no bubbles mixed in the liquid feed, experiments have found that the phenomenon of inorganic powder clogging the nozzle tube is very serious.

Compared with the prior art, the utility model has the following beneficial effects:

1. The utility model generates micron bubbles in situ by high-speed shear force during the stirring process of the air-mixing stirring kettle to improve the mutual solubility between the inorganic powder and the feed liquid in the mixed solution system. The feed liquid is stirred together with the micron-sized bubbles and then output to the droplet forming unit. The secondary stirring effect of the micron-sized bubbles in the feed liquid can avoid the inorganic powder in the feed liquid from clogging the droplet nozzle to the greatest extent. In one of the technical solutions, the micron bubbles are kept stably suspended during the pressure balance process in a limited space to maximize the effect of the micron bubbles.

2. The bubble generator in the utility model is a cylindrical structure to prevent the structure of the adhesive molecular chain in the liquid from being destroyed under high-speed shear force; in one of the technical solutions, a ring pipe or a spirally arranged infusion pipe is used to stably transport the mixed liquid with micron bubbles, effectively preventing the inorganic powder adsorbent in the traditional mold from clogging the droplet nozzle, thereby ensuring the continuity of the adsorption particle production.

3. In one of the technical solutions, a conical connecting seat and a nozzle tube are used for droplet forming, so that the liquid flows faster and the droplets are formed quickly without tailing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the overall structure of a particle forming device for preparing a lithium extraction adsorbent based on a precipitation method as described in Example 1 of the present invention.

FIG. 2 is a schematic structural diagram of the bubble generator in Example 1 of the utility model.

FIG3 is a schematic diagram of the three-dimensional structure of the liquid droplet nozzle in Example 1 of the utility model.

FIG4 is a schematic diagram of the cross-sectional structure of the liquid droplet nozzle in Example 1 of the utility model.

FIG5 is a schematic diagram of the structure of the infusion pipeline in Example 1 of the utility model.

FIG6 is a schematic diagram of the structure of the infusion pipeline in Embodiment 2 of the present utility model.

FIG. 7 is a schematic diagram of the structure of the infusion pipeline in Example 3 of the present utility model.

In the figure, 1 is a motor, 2 is a feed port, 3 is a constant temperature liquid circulation outlet, 4 is a heat-insulating shell, 5 is a feed liquid output port, 6 is a gas transmission pipeline, 7 is an air compressor, 8 is a mixing tank shell, 9 is a constant pressure port, 10 is an anchor agitator, 11 is an air input pipeline, 12 is a constant temperature liquid circulation inlet, 13 is a valve, 14 is a liquid delivery pipeline, 15 is a droplet nozzle, 17 is a droplet precipitation tank, 18 is a bubble generator, 19 is a nanopore, 22 is a conical connecting seat, and 23 is a nozzle tube.

DETAILED DESCRIPTION

The present invention is further described below by way of examples and in conjunction with the accompanying drawings. It is worth noting that the given examples cannot be understood as limiting the scope of protection of the present invention, and some non-essential improvements and adjustments made by technicians in the field to the present invention based on the content of the present invention should still fall within the scope of protection of the present invention. Although it is believed that ordinary technicians in the field fully understand the following terms, the following definitions are still stated to help illustrate the subject matter disclosed by the present invention.

A particle forming device for preparing a lithium extraction adsorbent based on a precipitation method is mainly composed of an air mixing stirring kettle, a droplet forming unit and a droplet precipitation tank.

The air mixing type stirring kettle is composed of an anchor stirrer arranged in the stirring kettle shell, a motor driving the stirrer to rotate, and an air compressor. An air input pipeline is passed through the anchor stirrer, and the input end of the air input pipeline is connected to the air delivery end of the air compressor. A bubble generating device is arranged at the outer end of the anchor stirrer and is connected to the output end of the air input pipeline in the anchor stirrer. Air is input from the air compressor through the air input pipeline into the bubble generator. The bubble generator is a hollow cylindrical body connected to the outside world and has a plurality of nanopores.

The droplet forming unit is composed of a liquid infusion pipeline and a droplet nozzle arranged on the liquid infusion pipeline, and the liquid infusion pipeline is connected to a liquid outlet arranged at the bottom of the air mixing stirring kettle;

The droplet precipitation tank is placed below the droplet nozzle and is used to receive the droplets formed by the droplet nozzle. The droplets are rapidly precipitated by the non-solvent liquid in the droplet precipitation tank to prepare lithium-extracting adsorbent particles.

The inventive point of the utility model is that air is input from an air compressor into a bubble generator through an air input pipe. Since the bubble generator is fixed to the outer edge end of the anchor agitator, it rotates along with the anchor agitator. During the rotation, the air inside the bubble generator is thrown into the liquid in the stirring kettle through nanopores to form micron-sized bubbles. The liquid is stirred together with the micron-sized bubbles and then output to a droplet forming unit. The secondary stirring effect of the micron-sized bubbles in the liquid can avoid the inorganic powder in the liquid from clogging the circular hole droplet nozzle to the greatest extent.

In one of the embodiments, in order to better connect the input end of the air input pipe with the air delivery end of the air compressor, a hollow shaft motor with an air injection port can be selected according to the prior art, and the anchor agitator with an air input pipe passing through it is driven to rotate by the hollow shaft motor, and air is input into the air input pipe passing through the anchor agitator through the air injection port of the hollow shaft motor.

In one embodiment, in order to better balance the air pressure of the air-mixing stirred tank, the air inlet end of the air compressor is connected to the interior of the stirred tank shell; further, the air-mixing stirred tank is also provided with a constant pressure port to allow dehydrated air to enter.

In one embodiment, in order to facilitate maintenance of the bubble generator, the bubble generator is threadedly connected to the outer end of the anchor agitator; further, a sealing ring is provided at the threaded connection to prevent the slurry from entering the hollow interior of the bubble generator.

In one embodiment, in order to produce micron-sized bubbles with better secondary stirring effect, the nanopores on the bubble generator are tapered holes that are wide inside and narrow outside, and the diameter at the narrowest point is 180 to 220 nm. It should be noted that although nanopores narrower than the above are conducive to generating nano-sized bubbles with better secondary stirring effect, the cost of the bubble generator and the air compressor will increase significantly.

In one embodiment, a heat-insulating shell layer into which a constant-temperature liquid circulation can be injected is arranged outside the stirred tank shell, and a constant-temperature liquid circulation inlet and a constant-temperature liquid circulation outlet are respectively arranged.

In one embodiment, the liquid infusion pipeline of the droplet forming unit is a one-way pipeline with a closed end, or a ring-shaped pipeline with an infusion channel opening.

In one embodiment, in order to maintain the secondary stirring effect of the micron-sized bubbles, the liquid infusion pipeline of the droplet forming unit is spirally arranged.

In one embodiment, the droplet nozzle is a circular mouth.

In one embodiment, in order to facilitate the regulation of the particle forming shape and further improve the droplet forming production efficiency, the droplet nozzle is composed of a conical connecting seat and a nozzle tube, the wide end of the conical connecting seat is connected to the infusion pipeline to facilitate the pressurized spraying of the liquid, and the narrow end is fixedly connected to the nozzle tube, and the particle forming shape is regulated by replacing the nozzle tube; the nozzle tube has a circular or square mouth, a diameter of 50 to 1500 μm, and a length of 0.5 to 5.0 cm.

It should be noted that the above-mentioned droplet nozzle is a technical solution consisting of a conical connecting seat and a nozzle tube. Under the premise that there are no bubbles mixed in the liquid feed, experiments have found that the phenomenon of inorganic powder clogging the nozzle tube is very serious.

The present invention will be further explained in detail with reference to the following examples. However, it should be understood by those skilled in the art that these examples are provided for illustrative purposes only and are not intended to limit the present invention.

Example

The embodiments of the present application will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. The specific conditions not specified in the examples are carried out according to the conditions recommended by normal conditions or manufacturers. The reagents used or the instruments not specified by the manufacturer are all conventional products that can be obtained commercially. The application should not be construed as being limited to the specific examples described.

Example 1

A particle forming device for preparing a lithium extraction adsorbent based on a precipitation method is composed of an air mixing stirring kettle, a droplet forming unit and a droplet precipitation tank 17.

The air mixing type stirring kettle is composed of an anchor stirrer 10 arranged in a stirring kettle shell 8, a motor 1 for driving the stirrer to rotate, and an air compressor 7. An air input pipe 11 is passed through the anchor stirrer 10, and the input end of the air input pipe 11 is connected to the air delivery end of the air compressor. A bubble generating device 18 is arranged at the outer end of the anchor stirrer 10 and is connected to the output end of the air input pipe 11 in the anchor stirrer. Air is input from the air compressor 7 through the air input pipe 11 to the bubble generator 18; the bubble generator 18 is a hollow cylindrical body having a plurality of nanopores 19 connected to the outside.

The droplet forming unit is composed of a liquid infusion pipeline 14 and a droplet nozzle 15 arranged on the liquid infusion pipeline, and the liquid infusion pipeline 14 is connected to a liquid outlet 5 arranged at the bottom of the air mixing stirring kettle;

The droplet precipitation tank 17 is placed below the droplet nozzle 15 and is used to receive the droplets formed by the droplet nozzle. The droplets are rapidly precipitated by the non-solvent liquid in the droplet precipitation tank to prepare lithium-extracting adsorbent particles;

The motor 1 is a hollow shaft motor with an air injection port, the air delivery end of the air compressor 7 is connected to the air delivery pipeline 6, and the other end of the air delivery pipeline 6 is connected to the air injection port of the hollow shaft motor;

The air inlet end of the air compressor 7 is connected to the interior of the stirring kettle shell 8; the air mixing stirring kettle is also provided with a constant pressure port 9 to allow dehydrated air to enter; the air mixing stirring kettle is provided with a feed port 2 to facilitate feeding;

The bubble generator 18 is threadedly connected to the outer end of the anchor agitator 10; a sealing ring is also provided at the threaded connection to prevent the liquid from entering the hollow interior of the bubble generator;

The nanopore 19 on the bubble generator 18 is a tapered hole that is wide inside and narrow outside, and the diameter at the narrowest point is 200 nm;

A heat-insulating shell layer 4 into which a constant-temperature liquid circulation can be injected is arranged on the outer peripheral surface of the stirring tank shell 8, and a constant-temperature liquid circulation inlet 12 and a constant-temperature liquid circulation outlet 3 are respectively arranged.

The liquid delivery pipeline 14 of the droplet forming unit is a one-way pipeline with a closed end and a U-shaped configuration; a valve 13 is also provided on the liquid delivery pipeline near the liquid delivery port 5;

The droplet nozzle 15 is composed of a conical connecting seat 22 and a nozzle tube 23. The wide end of the conical connecting seat 22 is connected to the liquid infusion pipeline to facilitate the pressurized spraying of the liquid, and the narrow end is fixedly connected to the nozzle tube 23; the nozzle tube 23 is a circular mouth with a diameter of 1000μm and a length of 2.0cm. The particle size of the spherical lithium extraction adsorbent particles obtained by the nozzle tube is 2.3-2.5mm.

Example 2

Embodiment 2 is consistent with Embodiment 1 except for the infusion pipe 14;

As shown in the figure, the infusion pipe 14 is an annular pipe with an infusion channel opening.

Example 3

Embodiment 3 is consistent with Embodiment 1 except for the infusion pipe 14;

As shown in the figure, the infusion pipeline 14 is a one-way pipeline with a closed end and is arranged in a spiral shape.

The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims (10)

1. A particle forming device for preparing a lithium extraction adsorbent based on a precipitation method, characterized in that it is mainly composed of an air mixing stirring kettle, a droplet forming unit and a droplet precipitation tank, The air mixing type stirring kettle is composed of an anchor stirrer arranged in the stirring kettle shell, a motor driving the stirrer to rotate, and an air compressor. An air input pipeline is passed through the anchor stirrer, and the input end of the air input pipeline is connected to the air delivery end of the air compressor. A bubble generating device is arranged at the outer end of the anchor stirrer and is connected to the output end of the air input pipeline in the anchor stirrer. Air is input from the air compressor through the air input pipeline into the bubble generator. The bubble generator is a hollow cylindrical body connected to the outside world and has a plurality of nanopores. The droplet forming unit is composed of a liquid infusion pipeline and a droplet nozzle arranged on the liquid infusion pipeline, and the liquid infusion pipeline is connected to a liquid outlet arranged at the bottom of the air mixing stirring kettle; The droplet precipitation tank is placed below the droplet nozzle and is used to receive the droplets formed by the droplet nozzle. The droplets are rapidly precipitated through the non-solvent liquid contained in the droplet precipitation tank to prepare lithium-extracting adsorbent particles. 2. According to claim 1, the particle forming device for preparing lithium extraction adsorbent based on precipitation method is characterized in that: the air inlet end of the air compressor is connected to the interior of the stirring tank shell; and a constant pressure port is also provided on the air mixing stirring tank. 3. According to claim 1, the particle forming device for preparing lithium extraction adsorbent based on precipitation method is characterized in that: the bubble generator is threadedly connected to the outer end of the anchor agitator, and a sealing ring is also provided at the threaded connection. 4. The particle forming device for preparing lithium extraction adsorbent based on precipitation method according to claim 1 is characterized in that the nanopores on the bubble generator are conical holes that are wide inside and narrow outside, and the diameter at the narrowest point is 180 to 220 nm. 5. According to claim 1, the particle forming device for preparing lithium extraction adsorbent based on precipitation method is characterized in that: a heat-insulating shell layer into which a constant temperature liquid circulation can be injected is arranged outside the stirred tank shell, and a constant temperature liquid circulation inlet and a constant temperature liquid circulation outlet are respectively arranged. 6. The particle forming device for preparing lithium extraction adsorbent based on precipitation method according to claim 1 is characterized in that the infusion pipeline of the droplet forming unit is a one-way pipeline with closed ends, or an annular pipeline with an infusion channel opening. 7. The particle forming device for preparing lithium extraction adsorbent based on precipitation method according to claim 1 is characterized in that the liquid infusion pipeline of the droplet forming unit is spirally arranged. 8. The particle forming device for preparing lithium extraction adsorbent based on precipitation method according to claim 1 is characterized in that: the droplet nozzle is a circular mouth. 9. According to claim 1, the particle forming device for preparing lithium extraction adsorbent based on precipitation method is characterized in that: the droplet nozzle is composed of a conical connecting seat and a nozzle tube, the wide end of the conical connecting seat is connected to the infusion pipeline to allow the liquid to be pressurized and sprayed out, and the narrow end is fixedly connected to the nozzle tube; the nozzle tube is a circular mouth or a square mouth, with a diameter of 50 to 1500 μm and a length of 0.5 to 5.0 cm. 10. The particle forming device for preparing lithium extraction adsorbent based on precipitation method according to claim 1, characterized in that: the motor is a hollow shaft motor.