CN223491094U - A grinding and sieving system - Google Patents

Abstract

The utility model relates to the technical field of lithium battery recovery, in particular to a grinding and screening system, which comprises a first grinding machine, wherein the first grinding machine is sequentially connected with a first hopper and a swinging screen, the swinging screen is provided with a swinging screen large particle discharge port, a swinging screen middle particle discharge port and a swinging screen small particle discharge port, the swinging screen large particle discharge port is connected with a large particle hopper, the swinging screen middle particle discharge port is connected with a second grinding machine, the second grinding machine and the swinging screen small particle discharge port are both connected with a small particle hopper, the top end of the first grinding machine is connected with a first negative pressure pipeline, the top end of the second grinding machine is connected with a second negative pressure pipeline, negative pressure fans are respectively arranged on the first negative pressure pipeline and the second negative pressure pipeline, and the first negative pressure pipeline and the second negative pressure pipeline are both connected with a powder hopper. The method can grind the sieved medium-grain-diameter materials again, separate the positive black powder adhered on the surfaces of the aluminum particles, improve the purity of the aluminum particles, collect the separated positive black powder, and improve the recovery rate of the positive black powder.

Description

Grinding and screening system

Technical Field

The utility model relates to the technical field of lithium battery recovery, in particular to a grinding and screening system.

Background

The waste lithium battery contains a large number of recyclable components such as various valuable metals and various organic matters, and how to safely recycle the lithium battery with high resource utilization is an important subject in the field of sustainable resource utilization. In the field of lithium battery recovery, the pole piece recovery process can be used for respectively recovering the positive pole piece and the negative pole piece in the lithium battery, so that the lithium battery can be widely applied.

The positive plate of the lithium battery is aluminum foil coated with positive active materials, in the existing positive plate recovery process, the shell is disassembled after discharge treatment is carried out on the waste lithium battery, then the positive plate and the negative plate in the battery core of the lithium battery are separated respectively, the positive plate is crushed and smashed in sequence, the aluminum foil is smashed into aluminum foil fragments in the process, most of positive materials are scraped from the aluminum foil and smashed into positive black powder, then screening is carried out, the positive black powder is separated from the aluminum foil fragments, finally the aluminum foil fragments are ground, large-particle aluminum foil fragments are ground into small-particle-size aluminum particles, and recycling of the aluminum foil is facilitated.

However, in the positive electrode sheet, the adhesion between the positive electrode active material and the aluminum foil is strong, and the positive electrode active material adhered to the surface of the aluminum foil is difficult to thoroughly separate when the positive electrode sheet is treated by using the existing positive electrode sheet recovery process, so that the recovered aluminum particles have low purity and the recovery rate of the positive electrode black powder is low.

Disclosure of utility model

Aiming at the problems that the existing positive plate recovery process is difficult to thoroughly separate positive electrode active materials attached to the surface of an aluminum foil, and the recovered aluminum particles are low in purity and low in positive electrode black powder recovery rate, the utility model provides a grinding and screening system which can grind medium-particle-diameter materials screened by a swinging screen again, separate positive electrode black powder attached to the surface of aluminum particles, improve the purity of aluminum particles in a small-particle hopper, collect the separated positive electrode black powder and improve the recovery rate of the positive electrode black powder.

The technical scheme of the utility model is as follows:

The grinding and screening system comprises a first grinding machine, wherein the first grinding machine is sequentially connected with a first hopper and a swinging screen;

The swing sieve is provided with a swing sieve large particle discharge port, a swing sieve middle particle discharge port and a swing sieve small particle discharge port, the swing sieve large particle discharge port is connected with a large particle hopper, the swing sieve middle particle discharge port is connected with a second grinding machine, and the second grinding machine and the swing sieve small particle discharge port are connected with a small particle hopper;

The top end of the first grinding machine is connected with a first negative pressure pipeline, the top end of the second grinding machine is connected with a second negative pressure pipeline, negative pressure fans are respectively arranged on the first negative pressure pipeline and the second negative pressure pipeline, and the first negative pressure pipeline and the second negative pressure pipeline are connected with a powder hopper.

Further, the swing screen is provided with a large-grain-diameter screen and a small-grain-diameter screen, the pore diameter of the large-grain-diameter screen is 3-5mm, and the pore diameter of the small-grain-diameter screen is 1-2mm.

Further, a first filter screen is arranged at the joint of the first grinding machine and the first negative pressure pipeline, a second filter screen is arranged at the joint of the second grinding machine and the second negative pressure pipeline, and the aperture of the first filter screen and the aperture of the second filter screen are 0.12-0.15mm.

Further, the first grinder is connected to the first hopper by a feeding device selected from the group consisting of a belt conveyor, a screw feeder and/or a bucket elevator.

Further, the first hopper is connected with the swinging sieve through a feeding pipeline, and a shut-off valve is arranged on the feeding pipeline.

Further, the large particle discharge port of the swinging sieve is connected with a sorting device, the sorting device is respectively connected with a floccule hopper and a large particle hopper, and the sorting device is selected from an electrostatic sorting machine or a winnowing machine. The materials discharged from the large-particle discharge port of the swinging sieve after being sieved by the swinging sieve are a mixture of a large amount of floccules and a small amount of large-particle aluminum foil, wherein the floccules are mainly formed by agglomerating diaphragm fragments, binder residues and other impurities in the positive plate. The floccules and the large-particle-size aluminum foils can be separated through the electrostatic separator or the winnowing machine, the floccules are collected into the floccule hopper, and the large-particle-size aluminum foils are collected into the large-particle hopper, so that the large-particle-size aluminum foils can be recycled further.

Further, the large particle hopper is connected with the first grinding machine through a circulating pipeline, and large particle aluminum foils in the large particle hopper can be returned to the first grinding machine through the circulating pipeline for circulating treatment, so that the recycling rate of the aluminum foils in the positive plate is further improved.

The utility model has the beneficial effects that:

1. According to the grinding and screening system provided by the utility model, the swing screen large particle discharge port, the swing screen middle particle discharge port and the swing screen small particle discharge port are arranged on the swing screen, the swing screen middle particle discharge port is connected with the second grinding machine, and the second grinding machine and the swing screen small particle discharge port are both connected with the small particle hopper.

2. According to the utility model, the first negative pressure pipeline is arranged at the top end of the first grinding machine, the second negative pressure pipeline is arranged at the top end of the second grinding machine, and the first negative pressure pipeline and the second negative pressure pipeline are both connected with the powder hopper.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic view showing the structure of a grinding and sieving system in example 1.

In the figure, 1-first grinder, 11-first negative pressure pipeline, 2-first hopper, 3-swinging screen, 4-second grinder, 41-second negative pressure pipeline, 5-sorting device, 6-large particle hopper, 61-circulation pipeline, 7-small particle hopper, 8-powder hopper and 9-floccule hopper.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

Example 1

The grinding and screening system comprises a first grinding machine 1, wherein the first grinding machine 1 is connected with a first hopper 2 through a feeding device, the feeding device is a belt conveyor, the first hopper 2 is connected with a swinging screen 3 through a feeding pipeline, and a shutoff valve is arranged on the feeding pipeline;

The swing screen 3 is provided with a large-grain screen and a small-grain screen, the pore diameter of the large-grain screen is 3-5mm, and the pore diameter of the small-grain screen is 1-2mm, the swing screen 3 is provided with a swing screen large-grain discharge port, a swing screen medium-grain discharge port and a swing screen small-grain discharge port, the swing screen large-grain discharge port is connected with the sorting device 5, and the sorting device 5 is a winnowing machine, the sorting device 5 is respectively connected with the floccule hopper 9 and the large-grain hopper 6, the large-grain hopper 6 is connected with the first grinding machine 1 through a circulating pipeline 61, the swing screen medium-grain discharge port is connected with the second grinding machine 4, and the second grinding machine 4 and the swing screen small-grain discharge port are both connected with the small-grain hopper 7;

The top end of the first grinding machine 1 is connected with a first negative pressure pipeline 11, the top end of the second grinding machine 4 is connected with a second negative pressure pipeline 41, a first filter screen is arranged at the joint of the first grinding machine 1 and the first negative pressure pipeline 11, a second filter screen is arranged at the joint of the second grinding machine 4 and the second negative pressure pipeline 41, the apertures of the first filter screen and the second filter screen are 0.12-0.15mm, negative pressure fans are respectively arranged on the first negative pressure pipeline 11 and the second negative pressure pipeline 41, and the first negative pressure pipeline 11 and the second negative pressure pipeline 41 are connected with the powder hopper 8.

The working procedure for recycling the positive plate using example 1 was:

(1) The method comprises the steps of dismantling waste lithium battery shells, splitting the waste lithium battery shells into positive plates and negative plates, crushing and screening the positive plates, separating most of powdery positive black powder to obtain positive fragments, wherein the main components of the positive fragments are crushed aluminum foils, starting a negative pressure fan, a first grinding machine 1, a second grinding machine 4 and a swinging screen 3, putting the positive fragments into the first grinding machine 1 for grinding, scraping part of positive black powder adhered to the positive fragments in the grinding process, absorbing and conveying the positive black powder into a powder hopper 8 by a first negative pressure pipeline 11, and grinding to obtain a first grinding material;

(2) Sequentially conveying a first grinding material into a first hopper 2 and a swinging sieve 3, wherein the first grinding material is screened into a large-particle-size material, a medium-particle-size material and a small-particle-size material in the swinging sieve 3, the small-particle-size material is small-particle-size aluminum particles and is conveyed into a small-particle hopper 7 to be collected, the medium-particle-size material is aluminum particles adhered with positive black powder and is conveyed into a second grinding machine 4, the large-particle-size material is a mixture of a large amount of floccules and a small amount of large-particle-size aluminum foils and is conveyed into a sorting device 5 to be sorted and separated, the floccules are conveyed into a floccule hopper 9 to be collected, the large-particle-size aluminum foils are conveyed into a large-particle hopper 6 to be collected, and then the large-particle-size aluminum foils are conveyed into the first grinding machine 1 through a circulating pipeline 61 to be circularly treated;

(3) The second grinder 4 grinds the medium-grain-size material, and the positive black powder adhered to the medium-grain-size material is scraped off in the grinding process, sucked and conveyed into the powder hopper 8 by the second negative pressure pipeline 41, and small-grain-size aluminum particles are obtained after grinding and conveyed into the small-grain hopper 7 for collection.

Therefore, the grinding and sieving system of the embodiment 1 can process the positive electrode fragments, separate and obtain two products of small-particle-size aluminum particles and positive electrode black powder and floccule byproducts, and the obtained aluminum particles are high in purity and high in recovery rate of the positive electrode black powder.

Although the present utility model has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present utility model is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present utility model by those skilled in the art without departing from the spirit and scope of the present utility model, and it is intended that all such modifications and substitutions be within the scope of the present utility model/be within the scope of the present utility model as defined by the appended claims.

Claims (7)

1. The grinding and screening system comprises a first grinding machine, and is characterized in that the first grinding machine is sequentially connected with a first hopper and a swinging screen;

The swing sieve is provided with a swing sieve large particle discharge port, a swing sieve middle particle discharge port and a swing sieve small particle discharge port, the swing sieve large particle discharge port is connected with a large particle hopper, the swing sieve middle particle discharge port is connected with a second grinding machine, and the second grinding machine and the swing sieve small particle discharge port are connected with a small particle hopper;

The top end of the first grinding machine is connected with a first negative pressure pipeline, the top end of the second grinding machine is connected with a second negative pressure pipeline, negative pressure fans are respectively arranged on the first negative pressure pipeline and the second negative pressure pipeline, and the first negative pressure pipeline and the second negative pressure pipeline are connected with a powder hopper.

2. The grinding and sieving system of claim 1, wherein the rocking screen is provided with a large-size screen and a small-size screen, the mesh size of the large-size screen is 3-5mm, and the mesh size of the small-size screen is 1-2mm.

3. The grinding and sieving system of claim 1, wherein a first screen is provided at the junction of the first grinder and the first negative pressure conduit, and a second screen is provided at the junction of the second grinder and the second negative pressure conduit, the apertures of the first screen and the second screen being 0.12-0.15mm.

4. A grinding and screening system according to claim 1, wherein the first grinding mill is connected to the first hopper by a feeding device selected from the group consisting of a belt conveyor, a screw feeder and/or a bucket elevator.

5. The grinding and sieving system of claim 1, wherein the first hopper is connected to the shaker by a feed line with a shut-off valve disposed thereon.

6. A grinding and sieving system as claimed in claim 1, in which the large particle discharge port of the rocking screen is connected to a sorting device, which is connected to a floc hopper and a large particle hopper respectively, the sorting device being selected from an electrostatic classifier or a winnowing machine.

7. The grinding and sieving system of claim 6, in which the large particle hopper is connected to the first grinder by a circulation conduit.