CN108514763B - Continuous lead plaster screening method and device - Google Patents

Abstract

The invention discloses a continuous lead plaster screening method and a device. Firstly, lead plaster is prepared into homogenized slurry, the separation of the lead plaster and impurities is completed by wet screening, a separation screen swings under the force of external force, and screening operation and impurity removal operation on the screen are alternately performed; during screening, supplying lead plaster slurry to the separation screen; when the impurities are removed, the supply of the lead plaster slurry is stopped, and compressed air is introduced to the position below the sieve, so that the impurities on the sieve float upwards and overflow out of the separation sieve. The device for realizing the method comprises a water tank, a separating screen, a lead paste slurry pipe, a compressed air pipe, an oversize collecting tank and an outflow pipe, wherein the separating screen is fixed on a screen swing support connected with a screening motor, lead paste feeding pipe branch pipes and compressed air pipe branch pipes are respectively arranged in the sections of an upper cover barrel and a lower cover barrel of the separating screen, the oversize collecting tank is fixedly installed on the outer wall of the separating screen, and the lower end of the oversize collecting tank is communicated with an undersize logistics outlet pipe penetrating through the wall of the water tank. The method and the device can continuously screen and separate the lead plaster, and have simple operation and maintenance and high production efficiency.

Description

A continuous lead paste screening method and device

technical field

The invention belongs to the field of resource regeneration of waste and old lead-acid batteries, and is used for fine separation of lead paste in the regeneration process of waste and old lead-acid batteries.

Background technique

Lead-acid batteries will exist for a long period of time due to their advantages of stable performance, high safety and low manufacturing cost. After the scrapped lead-acid batteries are collected at the regeneration point, they are mechanically disassembled to obtain the main materials such as plastics, grids, lead paste, waste acid, etc. The lead paste is the most mixed lead-containing material, which contains a lot of plastic fragments and diaphragms. Fibers, all of which are obstacles to the short-process, high-efficiency recycling of lead paste. The development of high-efficiency sorting technology and equipment for broken plastic flakes and diaphragm fibers in lead paste is of great significance to the lead-acid battery resource recycling industry.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a continuous type lead paste screening method and device to achieve efficient separation of broken plastic flakes and fiber filaments.

The technical scheme of the present invention is:

A continuous lead paste screening method, comprising the steps:

The lead paste is made into a slurry and fully homogenized. The separation of lead paste and impurities is completed by wet screening with a separation screen. The separation screen is immersed in water. The separation screen is divided into several groups and divided into more than two groups. One part is screened, the other part is screened for impurities removal, and then alternately and alternately; when screening, supply lead paste slurry to the separation screen and screen the lead paste; when impurities are removed, stop supplying to the separation screen. The lead paste slurry is fed into the compressed air under the separation screen, so that the impurities on the separation screen (the impurities are mainly plastic flakes and fiber filaments) float up and overflow to leave the separation screen.

Further, the screen of the separation screen is immersed 5~20mm below the liquid surface.

Further, the mass fraction of the lead paste slurry is preferably 20 to 80%, preferably 40 to 60%; the lead paste feeding speed is preferably 60 to 180 ml/min, more preferably 80 to 120 ml/min; the sieve swing frequency is preferably 70 to 160 times /min, more preferably 100~130 times/min; separation screen mesh is preferably 100~400 mesh, more preferably 160~300 mesh.

A device used for the above-mentioned continuous lead paste screening method, comprising a water tank, a separation screen, a lead paste slurry pipe, a compressed air pipe, a collection tank for the over-sieve and an over-screen outflow pipe, and the separation screen is fixed on the screen. On the screen swing bracket, the screen swing bracket is connected with the screen motor, and the screen swing bracket is fixedly connected with the water tank through the fixed bracket; the lead paste slurry pipe is arranged above the water tank, and a branch pipe is arranged in the section of the upper cover barrel of each separation screen; the separation screen The upper end surface of the gap between the oversize collection groove and the outer wall of the separation screen is fixedly installed on the outer wall, and the upper end surface of the gap between the upper end surface and the outer wall of the separation screen is closed, but the lower end surface is closed but communicated with the under-sieve outflow pipe, which passes through the water tank wall; the compressed air pipe is arranged A branch pipe is arranged below the end face of the lower cover barrel of the separation screen, and in each section of the lower cover barrel of the separation screen.

Further, the length of the lower cover barrel of the separation screen is 1.5 to 4 times the length of the upper cover barrel.

Further, the oversize collection tank has the same cross-sectional shape as the separation sieve.

Further, the open end face of the branch pipe of the compressed air pipe is higher than the lower end face of the lower cover barrel of the separation screen by 1-1.2 times the length of the upper cover barrel.

Further, the under-sieve outflow pipe passes through the water tank wall and is connected with the external over-screen material storage tank.

The prepared and fully homogenized lead paste slurry is transported to the separation screen by the lead paste slurry pipe. The screen of the separation screen is submerged below the liquid level of the water tank, and the separation screen swings under the forced action of the screen motor to screen the lead paste. The lead paste particles pass through the screen to become under-sieves, and flow out of the under-sieve pipe to flow out of the device boundary, and then enter the follow-up treatment; When cleaning the sieve, stop supplying the lead paste slurry to the sieve, and at the same time start to supply compressed air to the lower part of the separation sieve. The compressed air moves upward through the sieve, and the gas-liquid circulation caused by the overflow causes the sieve to overflow into the sieve collection tank. And it flows out of the boundary of the device through the outflow pipe on the sieve, and then carries out subsequent processing.

The beneficial effects of the present invention are:

The method and device of the invention can continuously screen and separate the broken plastic pieces and diaphragm fibers entrained in the lead paste, the sorting efficiency is high, the impurity removal rate can be as high as 99.9% or more, and the operation is simple, the maintenance is convenient, and the production efficiency is high. high.

Description of drawings

FIG. 1 is a schematic structural diagram of the device of the present invention.

Detailed ways

The present invention will be further described below with reference to the examples. The waste lead-acid battery is subjected to crushing and sieving to obtain lead paste. The mass content of lead-free impurities in the sample lead paste is 0.9%, mainly plastics and filaments.

As shown in Figure 1, the continuous lead paste screening device of the present invention comprises a water tank 6, a separation screen 1, a lead paste slurry pipe 3, a compressed air pipe 4, an oversize collection tank 2 and an oversize outflow pipe 5, The described separation screen 1 is fixed on the screen swing bracket 9, the screen swing bracket 9 is connected with the screen motor 10, the screen swing bracket 9 is fixedly connected with the water tank 6 through the fixed bracket 8; the lead paste slurry pipe 3 is arranged above the water tank 6, In addition, a branch pipe is arranged in the section of the upper cover barrel of each separation screen 1; on the outer wall of the separation screen 1, a collection tank 2 is fixedly installed. The upper end face of the outer wall gap of the separation screen 1 is open, and the lower end face is closed but communicated with the under-sieve outflow pipe 7, which passes through the water tank wall and is connected with the external over-sieve storage tank; the compressed air pipe 4 is arranged in the separation Below the end face of the lower cover barrel of the screen 1, and a branch pipe is arranged in the section of the lower cover barrel of each separation screen 1.

The lead paste screening of the following examples was carried out in the above-mentioned screening device.

Example 1

The lead paste is added with water to make a slurry with a mass percentage of 40%, fully stirred and homogenized, the diameter of the separation screen is 200 mm, the screen mesh is 200 mesh, the feeding speed of the lead paste during screening is 100 ml/min, and the sieve swing frequency is 120 times/min. After 60 minutes, 6 liters of lead paste slurry was processed, 0.021 kg of impurities were collected in the outflow pipe on the screen, and the removal rate of impurities was 97.2%.

Example 2

The lead paste is added with water to make a slurry with a mass percentage of 60%, fully stirred and homogenized, the diameter of the separation screen is 200 mm, the screen mesh is 160 mesh, the feeding speed of the lead paste during screening is 100 ml/min, and the sieve swing frequency is 120 times/min. After 60 minutes, 6 liters of lead plaster slurry was processed, and 0.03 kg of impurities were collected by the outflow pipe on the screen, and the removal rate of impurities was 92.6%.

Example 3

The lead paste is added with water to make a slurry with a mass percentage of 40%, fully stirred and homogenized, the diameter of the separation sieve is 200 mm, the screen mesh is 300 mesh, the feeding speed of the lead paste during screening is 100 ml/min, and the sieve swing frequency is 120 times/min. After 60 minutes, 6 liters of lead paste slurry was processed, and 0.0216 kg was collected from the outflow pipe on the screen, and the impurity removal rate was 99.9%.

Claims (5)

1. a continuous type lead paste screening method, is characterized in that, comprises the steps: The lead paste is made into slurry and fully homogenized. The separation of lead paste and impurities is completed by wet screening of the separation screen. The separation screen is immersed in water. Impurity removal operation, and then alternately and alternately; during screening, supply lead paste slurry to the separation screen and screen the lead paste; when impurities are removed, stop supplying lead paste slurry to the separation screen and pass compression under the separation screen air to float the impurities on the separation screen and overflow to leave the separation screen; the screen of the separation screen is immersed 5~20mm below the liquid surface; The device used includes a water tank, a separation screen, a lead paste slurry pipe, a compressed air pipe, a collection tank for the oversized material and a flow out pipe over the screen. The separation screen is fixed on the screen swinging support, and the screen swinging support The motor is connected, and the screen swing bracket is fixedly connected to the water tank through the fixed bracket; the lead paste slurry pipe is placed above the water tank, and a branch pipe is arranged in the section of the upper cover barrel of each separation screen; the outer wall of the separation screen is fixedly installed. The upper end face of the gap between the upper material collection tank and the outer wall of the separation screen is open, and the lower end face is closed but communicated with the under-sieve outflow pipe, which passes through the water tank wall; A branch pipe is arranged in the section of the lower cover barrel of each separation screen; the length of the lower cover barrel of the separation screen is 1.5~4 times the length of the upper cover barrel; the opening end face of the branch pipe of the compressed air pipe is 1~1.2 times higher than the lower end face of the lower cover barrel of the separation screen. barrel length. 2. The continuous type lead paste screening method according to claim 1 is characterized in that, there are several separation sieves, which are divided into more than two groups. 3. A device for the method according to claim 1 or 2, characterized in that it comprises a water tank, a separation screen, a lead paste slurry pipe, a compressed air pipe, an oversize collection tank and an oversize outflow pipe, so that the The above-mentioned separation screen is fixed on the screen swing bracket, the screen swing bracket is connected with the screen motor, and the screen swing bracket is fixedly connected with the water tank through the fixed bracket; the lead paste slurry pipe is arranged above the water tank, and the barrel section is covered on each separation screen. A branch pipe is arranged inside; a collection tank for oversize is fixed on the outer wall of the separation screen, the upper end face of the overscreen collection tank and the gap between the outer wall of the separation screen is open, and the lower end face is closed but connected with the outflow pipe under the screen, and the outflow pipe under the screen passes through the water tank The compressed air pipe is arranged below the end face of the lower cover barrel of the separation screen, and a branch pipe is arranged in the section of the lower cover barrel of each separation screen; the length of the lower cover barrel of the separation screen is 1.5~4 times the length of the upper cover barrel; The open end face is higher than the lower end face of the lower cover barrel of the separation screen by 1~1.2 times the length of the upper cover barrel. 4 . The device according to claim 3 , wherein the oversize collection groove and the separation screen have the same cross-sectional shape. 5 . 5 . The device according to claim 3 , wherein the under-sieve outflow pipe passes through the water tank wall and is connected to the external over-sieve storage tank. 6 .

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