JP2003144976A - Centrifuge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make removal work of dewatered cakes from a discharge route for dewatered cakes by a worker unnecessary, lessen the labor of the worker, and improve the work efficiency. SOLUTION: A basket 2 is installed in the inside of a casing 1 in a manner that the basket can be freely operable and rotatable around a vertical shaft center O and also, a slurry supply part 3 for supplying a slurry to the basket 2, a filtrate discharge part 4 for discharging a filtrate from the basket 2, and a cake discharge part 5 for discharging a dewatered cake from the basket 2 are installed and a liquid jetting nozzle 11 for removing a dewatered cake adhering to a discharge route 10 for a dewatered cake from the basket 2 is installed in the discharge route 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a basket rotatably around a longitudinal axis in a casing, and a slurry supply section for supplying a slurry into the basket, and a filtrate discharged from the basket. The present invention relates to a centrifuge having a filtrate discharge section and a cake discharge section for discharging dehydrated cake from the basket.

[0002]

2. Description of the Related Art In the above centrifuge, the rotation of the basket causes the filtrate to be discharged between the basket and the casing to be discharged from the filtrate discharge section, and the solid components in the slurry are deposited on the inner wall of the basket as a dehydrated cake. , The dehydrated cake is scraped by a scraping mechanism and collected as a product.

As described above, the product is obtained by repeating a series of steps including filtration of slurry, dehydration, washing, and scraping of the dehydrated cake, because the dehydrated cake scraped by the scraping mechanism is wet. , A part of the dehydrated cake easily adheres to the discharge passage of the dehydrated cake from the basket.

When the dehydrated cake adheres to the discharge passage, the slurry splashed from the casing at the time of the next filtration / dehydration adheres to and mixes with the dehydrated cake adhered to the discharge passage, and is dehydrated after the filtration / dewatering. When the cake passes through the discharge path, drop the dehydrated cake attached to the discharge path,
The dehydrated cakes will be collected in a mixed state.

In this case, not only the target solid component (for example, aluminum hydroxide) but also the component in the slurry (for example, caustic soda) will be recovered in a mixed state, and the value of the solid component (aluminum hydroxide) as a product Will be lower.

Therefore, conventionally, a worker manually removes the dehydrated cake attached to the discharge passage of the dehydrated cake from the basket so that only a target solid component can be recovered.

[0007]

However, if the worker manually removes the dehydrated cake attached to the discharge passage of the dehydrated cake from the basket as in the prior art, the burden on the operator is large, and the removal is also required. At the time of work, the work efficiency had to be lowered because the operation had to be stopped.

The present invention has been made in view of the above circumstances, and an object thereof is to eliminate the work of removing the dehydrated cake by the operator from the discharge passage of the dehydrated cake, thereby reducing the labor of the operator, and The point is to be able to increase efficiency.

[0009]

According to a characteristic configuration of the present invention, in the centrifuge described at the beginning, a liquid jet nozzle for removing the dehydrated cake adhering to the discharge passage of the dehydrated cake from the basket from the discharge passage is provided. The point is that it is provided.

According to this structure, even if a part of the dehydrated cake scraped by the scraping mechanism adheres to the discharge passage of the dehydrated cake from the basket, the liquid can be sprayed and removed by the liquid spray nozzle. .

Therefore, it is possible to eliminate the work of removing the dehydrated cake by the operator from the discharge passage of the dehydrated cake, to reduce the labor of the operator, and to stop the operation when removing the dehydrated cake. Work efficiency can now be improved.

As a preferred embodiment of the present invention, there may be mentioned a constitution in which a dehydration cake returning means for supplying the dehydration cake removed from the discharge passage by the liquid injection nozzle into the basket is provided.

According to this structure, since the dehydrated cake removed from the discharge passage by the liquid injection nozzle is fed back into the basket, the components constituting the dehydrated cake can be centrifugally collected again without being discarded. You can

Therefore, the productivity could be further improved.

As another preferred embodiment of the present invention, the drainage passage for the dehydrated cake is provided with an outer wall spaced apart from the basket rotation drive section on the lower side of the basket, and the basket rotation drive section is provided. A first hopper for receiving a dehydrated cake flowing between the outer walls is provided and configured, and the cake returning means is provided with a second hopper capable of switching between a communication state communicating with the first hopper and a non-communication state. The dewatering cake removed from the discharge path by the liquid injection nozzle is configured to be receivable in the second hopper in the communicating state, and the dewatering cake in the second hopper is returned to the basket through a return line and supplied. A configuration configured to do so can be given.

According to this structure, the dewatering cake accumulated on the inner wall of the basket is scraped off by the scraping mechanism, and the basket rotation drive section on the lower side of the basket and the outer wall provided with a space therebetween. It can be made to enter the 1st hopper through a gap, and can be collected as a product from the 1st hopper.

Further, the dehydrated cake removed from the discharge passage by the liquid injection nozzle can be received in the second hopper in the communicating state, and the dehydrated cake in the second hopper can be returned and supplied into the basket through the return pipe.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a centrifuge for recovering aluminum hydroxide as a product from a slurry.

In the centrifuge, a basket 1 having a large number of holes is provided in a casing 2 so as to be rotatable about a longitudinal axis O, and a slurry supply section 3 for supplying slurry into the basket 1 and the basket 1. The filtrate discharge unit 4 for discharging the filtrate from the basket, the cake discharge unit 5 for discharging the dehydrated cake from the basket 1, the cleaning device (not shown) for cleaning the inside of the machine, and the dehydrated cake accumulated on the inner wall of the basket. A scraping scraping mechanism 19 is provided, and aluminum hydroxide is obtained by repeating a series of steps including filtration of slurry, dehydration, washing, and scraping of a dehydrated cake.

The rotation drive unit 6 for rotating the basket 1 includes a belt, which includes an electric motor M in a downward posture arranged laterally outside the casing 2 and a basket rotation shaft 8 supported by a rotation shaft support unit 7. It is configured to be interlocked and coupled via a transmission mechanism 9.

The drainage passage 10 for the dehydrated cake has an outer wall 1 with respect to the basket rotation drive unit 6 on the lower side of the basket 1.
3 are provided at intervals, and a first hopper 14 for receiving the dehydrated cake flowing between the basket rotation drive unit 6 and the outer wall 13 is provided.

Although aluminum hydroxide is obtained as described above, since the dehydrated cake scraped by the scraping mechanism 19 is moist, a part of the dehydrated cake is discharged from the basket 1, particularly the dehydrated cake discharge passage 10. It tends to adhere to the inclined inner peripheral surface A of the first hopper 14 and the inclined outer peripheral surface B of the rotary shaft support portion 7.

When the dehydrated cake adheres to the discharge passage 10, the slurry repelled from the casing 2 adheres and mixes with the dehydrated cake adhered to the discharge passage 10 at the time of the next filtration and dehydration, and is scraped after the filtration and dehydration. When the obtained dehydrated cake passes through the discharge passage 10, the dehydrated cake attached to the discharge passage 10 is also dropped, and the dehydrated cake is collected in a mixed state.

In this case, not only the target aluminum hydroxide but also the components in the slurry (for example, caustic soda) are recovered in a mixed state, and the solid component (aluminum hydroxide) is less valuable as a product.

Therefore, the hot water jet nozzle 11 (corresponding to a liquid jet nozzle) for removing the dehydrated cake adhering to the drainage channel 10 of the dehydrated cake from the basket 1 from the drainage path 10
Is provided so that its position can be freely changed in the vertical direction and the circumferential direction of the outer wall 13, and as shown in FIGS. 2 and 3, the dehydrated cake removed from the discharge passage 10 by the hot water injection nozzle 11 is fed back into the basket 1. A dehydrating cake returning means 12 is provided.

In the cake returning means 12, the second hopper 15 which can be switched between a communicating state (see FIG. 3) communicating with the first hopper 14 and a non-communicating state (see FIG. 2) is provided below the first hopper 14. And the dehydrated cake removed from the discharge passage 10 by the hot water injection nozzle 11 is provided in the second state in the communication state.
Inside the hopper 15 (located directly below the first hopper 14)
Second hopper 15
The dehydrated cake in the inside is fed back into the basket 1 by the pump 17 through the return line 16. 18
Is a storage tank. The dehydrated cake scraped off by the scraping mechanism 19 makes the second hopper 15 in the non-communication state (positioned below the lateral outer side of the first hopper 14) in the recovery path 2.
Collect on the 0 side.

The second hopper 15 is driven to change its position from side to side via a guide rail mechanism 21 and a hydraulic cylinder (not shown).

With the above structure, a series of processes including filtration of slurry, dehydration, washing, and scraping of dehydrated cake are repeated, and the filtrate is discharged between the basket 1 and the casing 2 by rotating the basket 1 to discharge the filtrate. The solid content (aluminum hydroxide) in the slurry while being discharged from the part 4
Are deposited on the inner wall of the basket as a dehydrated cake, and the dehydrated cake is scraped off by the scraping mechanism 19 so that the space between the basket rotation drive unit 6 on the lower side of the basket 1 and the outer wall 13 provided with a space therebetween. Through the first hopper 14 and collected as a product from the first hopper 14.

Further, the dehydrated cake removed from the discharge passage 10 by the hot water jet nozzle 11 is connected to the second hopper 1 in the communicating state.
5, and the dehydrated cake in the second hopper 15 is fed back into the basket 1 through the return line 16.

[Other Embodiment] Although the position of the hot water injection nozzle 11 is freely changeable in the above embodiment, the position may be fixed instead of this structure. In this case, a plurality of injection ports are provided corresponding to the places where the dehydrated cake is likely to adhere.

Instead of the hot water jet nozzle 11, a liquid jet nozzle for jetting water or another liquid may be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a centrifuge.

FIG. 2 is a diagram showing a piping structure and the like of a centrifuge.

FIG. 3 is a diagram showing a piping structure and the like of a centrifuge.

[Explanation of symbols]

1 casing 2 baskets 3 Slurry supply section 4 Filtrate discharge part 5 Cake discharge section 6 Basket rotation drive 10 discharge path 11 Liquid injection nozzle 12 Cake return means 13 outer wall 14 1st hopper 15 Second hopper

Continued front page    (72) Inventor Narita Terada             Sumitomo Chemical 5-1, Soukai-cho, Niihama-shi, Ehime             Industry Co., Ltd. F-term (reference) 4D057 AB01 AC02 AD01 AE02 AF01                       BA36 BC15

Claims (3)

[Claims] 1. A slurry supply section for rotatably driving a basket around a longitudinal axis in a casing, a slurry supply section for supplying a slurry into the basket, and a filtrate discharge section for discharging a filtrate from the basket. A centrifuge provided with a cake discharge part for discharging the dehydrated cake from the basket, wherein a liquid injection nozzle for removing the dehydrated cake attached to the discharge passage of the dehydrated cake from the basket is provided. A centrifuge. 2. The centrifuge according to claim 1, further comprising dehydration cake returning means for supplying the dehydration cake removed from the discharge path by the liquid injection nozzle into the basket. 3. A drainage passage for the dehydrated cake is provided with an outer wall spaced apart from the basket rotation drive section on the lower side of the basket, and a dehydration cake flowing between the basket rotation drive section and the outer wall. A first hopper for receiving the cake is provided, and the cake returning means is provided with a second hopper that can be switched between a communication state in which the first hopper is in communication and a non-communication state, and the liquid injection nozzle is configured to discharge the discharge path. The dehydrated cake removed from the second hopper is configured to be receivable in the communicating second hopper, and the dehydrated cake in the second hopper is returned to the basket through a return pipe. 2. The centrifuge described in 2.