Tailing recovery device

Abstract

The utility model relates to the field of lithium battery positive electrode material preparation, and particularly discloses a tailing recovery device which comprises a first bag-type dust collector, a tail gas washing fan and a second bag-type dust collector, a dust outlet of the first bag-type dust collector is communicated with a sealed collecting tank, and the bottom of the collecting tank is communicated with a dusty gas inlet of the second bag-type dust collector; a first electromagnetic valve is arranged on the pipeline close to one end of the collecting tank, a purified gas outlet of the second bag-type dust remover is connected with a bag-type dust removal fan, the bag-type dust removal fan is connected with the collecting tank through a pipeline, and a second electromagnetic valve is arranged on the pipeline close to one end of the collecting tank; a purified gas outlet of the first bag-type dust collector is connected with a tail gas washing fan; a dust outlet of the second bag-type dust collector is connected with a temporary storage bin, the bottom of the temporary storage bin is connected with a screw feeder, and the screw feeder is connected with a tailing repulping tank. According to the scheme, the problems that the tailings are difficult to automatically collect, store and recycle to the original iron phosphate production process during collection at present, and the tail powder recycling environment is severe can be solved.

Description

Technical Field

[0001] The utility model relates to the field of preparation of lithium battery cathode materials, and particularly relates to a tailing recycling device. Background Art

[0002] As a ferric phosphate production enterprise, our company has a ferric phosphate device with an annual output of 40,000 tons. During the production and operation of the 40,000-ton / year ferric phosphate device, a large amount of tailings are generated. Since the tailings enter the bag filter for gas-solid separation along with the tail gas after passing through the dehydration and calcination section, our company previously designed the connection between the bag filter and the tail gas of the dehydration and calcination section. When actually collecting the tail powder, the following defects were found: Since the tail powder still contains more recoverable ferric phosphate raw materials, in order to save raw materials and reduce costs, the company plans to recycle the collected tail powder, design a tail powder recycling process for reuse, and set the tail powder recovery point in the existing ferric phosphate production process. However, the existing bag filter is set behind the dehydration and calcination section, resulting in that the tail powder separated by the bag filter needs to be collected by investing a large amount of manpower and then transported back to the front process of the ferric phosphate process; at the same time, there is a lack of protective facilities under the bag filter during the collection process, and the calcination temperature is as high as 600 degrees Celsius, and the temperature of the tail powder collection environment is relatively high, resulting in increased collection difficulty, and the dust during the collection process causes great harm to the physical and mental health of the post personnel. Therefore, our company now proposes to transform some waste equipment to realize the automatic collection, storage and recycling of the tailings generated by the tail gas bag dust removal, and at the same time solve the problem of the harsh working environment during the collection process while reducing the labor intensity of employees. Summary of the Utility Model

[0003] The utility model aims to provide a tailing recycling device to solve the problems that the existing tailings are difficult to be automatically collected and stored, recycled to the original ferric phosphate production process for utilization, and the tail powder recycling environment is harsh.

[0004] To solve the above problems, the technical solution adopted by the utility model is as follows: A tailing recycling device includes a first bag filter and a tail gas washing fan, and is characterized in that: it further includes a second bag filter. The first bag filter and the second bag filter respectively include a dust-containing gas inlet, a clean gas outlet, a dust outlet, and a star-shaped discharger on the dust outlet. The dust outlet of the first bag filter is communicated with a sealed collection tank, the bottom of the collection tank is communicated with the dust-containing gas inlet of the second bag filter through a pipeline, and a solenoid valve I is arranged on the pipeline near one end of the collection tank. The clean gas outlet of the second bag filter is connected with a bag dust removal fan, the bag dust removal fan is connected with the collection tank through a pipeline, and a solenoid valve II is arranged on the pipeline near one end of the collection tank;

[0005] The dust outlet of the second bag filter is connected with a temporary storage bin through a star-shaped discharger, the bottom of the temporary storage bin is connected with a screw feeder, and the lower part of the screw feeder is connected with a tailing re-slurry tank.

[0006] The basic principle of this solution is as follows: When collecting the tailings from the dehydration and calcination section, solenoid valve 1 and solenoid valve 2 are closed, and the tail gas washing fan is turned on. The tail gas in the calcination section is drawn into the first bag filter, so that the gas-solid separation in the tail gas is achieved. The tail powder is collected and stored in the collection tank, and the tail gas is sent to the subsequent tail gas washing process and device for treatment. When the tail powder is to be recycled into the original iron phosphate production process, the star-shaped discharger on the first bag filter is closed, solenoid valve 1 and solenoid valve 2 are opened, the tailing washing fan is closed, and the bag dust removal fan is turned on. The bag dust removal fan pumps the air in the circulation pipeline from the collection tank to the second bag filter, and sends the tail gas at the clean gas outlet of the second bag filter back into the collection tank. In this process, the tail powder in the collection tank can be continuously sucked into the second bag filter, and the second bag filter separates the gas and solid, and collects the tail powder in the temporary storage bin. When the tail powder is not needed, the star-shaped discharger of the temporary storage bin can be closed; when the tail powder needs to be recycled, the star-shaped discharger of the temporary storage bin is opened, and at the same time, the screw feeder is started, and then the tailing in the screw feeder is transported to the packaging ton bag or the tailing re-slurry tank by controlling the opening and closing of the feeding valve 1 or the feeding valve 2.

[0007] The beneficial effects of this solution are as follows: Existing tailings are difficult to be automatically collected and stored, recycled into the original iron phosphate production process for utilization, and the tail powder recycling environment is harsh. By setting a second bag filter on the side of the re-slurry tank and adding a collection tank at the lower end of the first bag filter, and connecting the collection tank, the first bag filter and the second bag filter through a circulation pipeline, it can not only automatically collect and store the tailings, but also send them back to the tailing re-slurry tank for re-slurrying as needed, achieve quantitative transportation through a screw feeder, and use a bag dust removal fan to transport the tailings in the circulation pipeline to avoid the introduction of external impurities to pollute the tailings. At the same time, transporting the powder in the circulation pipeline can avoid the escape of high-temperature tailings into the environment and play a protective role in the physical health of the staff.

[0008] Furthermore, a feeding valve 2 is connected between the screw feeder and the tailing re-slurry tank. The feeding valve 2 is used to control the tailings entering the tailing re-slurry tank.

[0009] Furthermore, a feeding valve 1 is also connected to the lower part of the screw feeder, and a replaceable packaging bag is connected to the feeding valve 1. The tail powder can be transported out through the feeding valve 1, or the powder can be packaged and sold or stored in a warehouse through a packaging ton bag.

[0010] Furthermore, a feeding chute is provided between the screw feeder and the tailing re-slurry tank, and the bottom of the feeding chute is conical. The shape of the feeding chute makes the upper diameter of the feeding chute thicker, which is convenient for increasing the flow rate of the tailings entering the tailing re-slurry tank.

[0011] Further, the first bag filter, the second bag filter, the tail gas washing fan, the bag dust removal fan, solenoid valve 1, solenoid valve 2, the screw feeder, the blanking valve 1, and the blanking valve 2 are respectively electrically connected to an externally provided controller. The precise operation of the entire recovery device is achieved through an automatic control method.

[0012] Further, the collection tank is a closed water bucket type. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of an embodiment of the present invention. Specific Embodiments

[0014] The following is a further detailed description through specific embodiments:

[0015] The reference numerals in the accompanying drawings of the specification include: the first bag filter 1, the tail gas washing fan 2, the bag dust removal fan 3, the second bag filter 4, the collection tank 5, solenoid valve 1 51, solenoid valve 2 52, the temporary storage bin 6, the screw feeder 7, the blanking valve 1 71, the blanking valve 2 72, and the tail material re-slurrying tank 8.

[0016] The embodiment is basically as shown Figure 1 in the attached drawings:

[0017] A tail material recovery device includes a first bag filter 1 and a second bag filter 4. The bag filter is a prior art. The dust-containing gas inlet of the bag filter is located on the middle side wall of the bag filter, the clean gas outlet is located on the top side wall of the bag filter, and the dust outlet is located at the bottom of the bag filter.

[0018] Among them, the dust-containing gas inlet on the first bag filter 1 is connected to the tail gas of the calcination section of the iron phosphate production process. The clean gas outlet on the first bag filter 1 is connected to the tail gas washing fan 2, and the tail gas washing fan 2 is used to introduce the tail gas into the subsequent tail gas washing device. The dust outlet on the first bag filter 1 is connected to the collection tank 5 through a star-shaped discharger. The collection tank 5 is in the shape of a sealed water bucket and is used to separate the dust after gas-solid separation.

[0019] In this embodiment, the tailings collected by the bag filter are used for re-slurry and then returned to the iron phosphate production process for recycling. Therefore, the second bag filter 4 is arranged on the upper side of the tailings re-slurry tank 8. The dust-containing gas inlet of the second bag filter 4 is connected to the lower end of the collecting tank 5 through a pipeline, and a solenoid valve 2 52 is arranged at one end of the pipeline close to the collecting tank 5; the clean air outlet of the second bag filter 4 is connected to the bag filter fan 3, and the bag filter fan 3 is connected to the lower end of the collecting tank 5 through a pipeline, and a solenoid valve 1 51 is arranged in front of the pipeline close to the collecting tank 5. The second bag filter 4, the bag filter fan 3, the solenoid valve 1 51, the collecting tank 5, and the solenoid valve 2 52 form a closed circulation pipeline, and the wind in the pipeline can circulate clockwise along this connection sequence.

[0020] The dust outlet of the second bag filter 4 is connected to the temporary storage bin 6 through a star-shaped discharger, and the bottom of the temporary storage bin 6 is connected to the screw feeder 7 through a star-shaped discharger. The spiral blades in the screw feeder 7 rotate axially and horizontally in the barrel, and the bottom of the barrel is respectively installed with a discharge valve 1 71 and a discharge valve 2 72 along its length, wherein the discharge valve 1 71 is used to connect to an external packaging ton bag, and the discharge valve 2 72 is used to connect to the tailings re-slurry tank 8, so that the collected tailings can be packaged in ton bags and then stored, and the collected tailings can also be directly put into the tailings re-slurry tank 8, and the tailing powder is stirred with water by the tailings re-slurry tank 8 and then transported back to the ferric phosphate production process.

[0021] In this embodiment, the first bag dust collector 1 is an existing bag dust collector with model F-87503A / B / C / D, and the second bag dust collector 4 is a discarded bag dust collector of the company with model F-87503. The two form a closed-loop negative pressure conveying circuit through the bag dust removal fan 3 to realize the automatic transportation of the tailings, and at the same time, the closed circulation pipeline is used to avoid the introduction of foreign matter in the environment during the transportation process to prevent the material from being contaminated.

[0022] In this embodiment, a material discharge chute is provided between the screw feeder 7 and the tailing material re-slurry tank 8, and the bottom of the material discharge chute is in a pointed cone shape.

[0023] In this embodiment, discharge valve 1 71, discharge valve 2 72, screw feeder 7, first bag dust collector 1, second bag dust collector 4, exhaust gas washing fan 2, bag dust removal fan 3, and multiple star-shaped dischargers are electrically connected to the peripheral controller respectively, thereby completing the automatic control of the entire exhaust gas recovery process.

[0024] The specific implementation process is as follows:

[0025] When collecting the tailings from the dehydration and calcination section, solenoid valve 1 51 and solenoid valve 2 52 are closed, the tail gas scrubbing fan 2 is turned on, and the tail gas in the calcination section is drawn into the first bag filter 1, so as to separate the gas and solid in the tail gas. The tail powder is collected and stored in the collection tank 5, and the tail gas is sent to the subsequent tail gas scrubbing process and device for treatment.

[0026] When the tail powder is to be recycled into the original iron phosphate production process, the rotary valve on the first bag filter 1 is closed, solenoid valve 1 51 and solenoid valve 2 52 are opened, the tailing scrubbing fan is closed, and the bag filter fan 3 is turned on. The bag filter fan 3 pumps the air in the circulation pipeline from the collection tank 5 to the second bag filter 4, and sends the tail gas at the clean gas outlet of the second bag filter 4 back into the collection tank 5. In this process, the tail powder in the collection tank 5 can be continuously sucked into the second bag filter 4, and the second bag filter 4 separates the gas and solid, and collects the tail powder in the temporary storage bin 6. When the tail powder is not needed, the rotary valve of the temporary storage bin 6 can be closed; when the tail powder needs to be recycled, the rotary valve of the temporary storage bin 6 is opened, and the screw feeder is started at the same time, and then the tailings in the screw feeder are transported to the packaging ton bag or the tailing re-slurry tank 8 by controlling the opening and closing of the feed valve 1 71 or the feed valve 2 72.

[0027] The above are only the embodiments of the present invention, and common knowledge such as the specific structures and characteristics known in the solutions are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicability of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A tailings recovery device, comprising a first bag dust collector and a tail gas washing fan, characterized in that: It also includes a second bag dust collector, and the first bag dust collector and the second bag dust collector respectively include a dust-containing gas inlet, a clean gas outlet, a dust outlet, and a star-shaped discharger on the dust outlet; The dust outlet of the first bag filter is connected to a sealed collecting tank, the bottom of the collecting tank is connected to the dust-containing gas inlet of the second bag filter through a pipeline, a solenoid valve 1 is provided on one end of the pipeline close to the collecting tank, the clean air outlet of the second bag filter is connected to a bag filter fan, the bag filter fan is connected to the collecting tank through a pipeline, and a solenoid valve 2 is provided on one end of the pipeline close to the collecting tank; the clean air outlet of the first bag filter is connected to an exhaust gas washing fan, and the exhaust gas washing fan is used to pass the exhaust gas into the exhaust gas washing equipment for treatment; The dust outlet of the second bag filter is connected to a temporary storage bin through a star-shaped discharger, the bottom of the temporary storage bin is connected to a screw feeder, and the lower part of the screw feeder is connected to a tailings re-slurry tank.

2. A tailings recovery device according to claim 1, characterized in that: A second discharge valve is connected between the screw feeder and the tailings re-slurry tank.

3. A tailings recovery device according to claim 2, characterized in that: The lower part of the screw feeder is also connected to a discharge valve 1, and a replaceable packaging bag is connected to the discharge valve 1.

4. A tailings recovery device according to claim 3, characterized in that: A material discharge chute is provided between the screw feeder and the tailing material re-slurry tank, and the bottom of the material discharge chute is in a pointed cone shape.

5. A tailings recovery device according to claim 4, characterized in that: The first bag dust collector, the second bag dust collector, the exhaust gas washing fan, the bag dust removal fan, the solenoid valve 1, the solenoid valve 2, the screw feeder, the discharge valve 1, and the discharge valve 2 are electrically connected to the external controller respectively.

6. A tailings recovery device according to claim 5, characterized in that: The collecting tank is a closed bucket type.

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