JP4392659B2 - Horizontal belt filter - Google Patents

Description

  The present invention relates to a production process in the chemical industry, food industry, or the like, or an improvement in a vacuum type horizontal belt filter symmetric with a stock solution such as metal hydroxide or pulp slurry.

  A vacuum type horizontal belt filter is widely used as a dehydrator for a stock slurry having a relatively good filterability. The horizontal belt filter is a horizontal filtration surface and can perform uniform solid-liquid separation. The concentrated slurry on the filtration surface has a reduced moisture content by cake washing or air blow, or an active ingredient is recovered and the cake washing efficiency is high. The horizontal belt filter has the advantages of simple structure and simple equipment and operation management. As a conventional horizontal belt filter, an endless filter cloth is placed on a circulating drive belt, and the filtrate in the dewatering groove formed in the belt is passed through the through hole of the slide plate disposed in the box-shaped vacuum box. A solid-liquid separation device adapted to suck is well known as described in Patent Document 1, for example. Further, a concentrating device in which an endless belt having a wire mesh structure is spanned between a pair of pulleys instead of a filter cloth is also known as described in Patent Document 2, for example.

JP 2004-105808 A (paragraph numbers 0014 to 0018, FIGS. 2 and 3) JP 2003-236596 A (paragraph number 0014, FIG. 1)

  The horizontal belt filter that sucks the filtrate from the slide plate through-hole with which the conventional belt is in sliding contact sucks the stock slurry supplied to the filter cloth from the dewatering groove of the belt that supports the filter cloth. The degree of vacuum is not constant, and a uniform cake with a low moisture content may not be obtained. The filter cloth used for the horizontal belt filter is a filter medium woven with synthetic fibers such as polypropylene, and the surface of the filter cloth has fine irregularities and a filtrate passage bent inside the filter cloth. The solid matter adhering to the filter cloth cannot be completely peeled off with a scraper alone, and the cake recovery rate is poor. Impurities can be removed from the solid matter staying in the folds of the filter cloth by high-pressure jetter cleaning or chemical cleaning, but a large amount of cleaning water and cleaning wastewater treatment become a problem. Since the filter cloth is a natural fiber such as synthetic fiber or cotton, it is not suitable for high temperature and solvent dehydration. The replaced dirty filter cloth cannot be recycled and a large amount of waste is generated, which must be incinerated or landfilled.

  The endless belt of the wire mesh structure used in the concentrator has a mesh structure and fine through holes are formed on the front and back surfaces between the metal wires, and the cake recovery rate is good, but it is easily clogged. Even if it is used as a filter medium in a horizontal belt filter, the filtrate is sucked, so a large amount of washing water is required to eliminate clogging. This invention uses a metal filter medium, maintains a vacuum pressure averaged over the entire filtration surface by a simple sealing structure and a devised vacuum suction, and increases the cake recovery rate, while maintaining a low moisture content without any variation. Provide a horizontal belt filter to get cake.

Horizontal belt filter according to the invention, the filtration surface of the filter belt filter bed of traveling freely supported belt and heavy set, in the solid-liquid separator which is disposed a vacuum box on the back surface of the filter bed of the support belt, the thickness direction A metal penetrating belt provided with a large number of fine holes penetrating into the surface and a support belt having a through hole formed between the seal bands by forming a grid-like seal band on the back surface and driving the support belt. A metal penetrating belt is accompanied, and a vacuum box is provided on the entire lower surface of the support belt filtration bed. A large number of rotatable support rollers are supported on both side walls of the vacuum box, and the outer periphery of the vacuum box is sealed. and attaching a box obtained by forming a water injection passage on the upper surface of the seal box, the filtrate of the filtration entire surface of the metal sheet belts, suction directly from through holes between the grid-like sealing strip of the support belt, grid A plurality of sealing strip is sequentially Suri設the water injection passage of the seal box, are water seal in the water injection has been injection path at the same time increasing the degree of vacuum, the frictional resistance can be reduced by the action of the lubricating water, as no variation uniform A cake is obtained. By driving the support belt, the metal penetrating belt is accompanied and can travel while preventing meandering. The traveling support belt is reduced in frictional resistance by the rotation of the support roller. Since the metal penetration belt has a flat surface, it is possible to regenerate the filter medium surface by washing the cake with a lower water pressure and less washing water as compared with the conventional filter cloth.

  The horizontal belt filter according to the present invention is configured as described above, and the support belt that is supported by the lattice belt seal band of the support belt is slid on the water injection path of the seal box attached to the vacuum box and is pivotally supported by the vacuum box. Thus, the vacuum degree of the vacuum box is maintained by water sealing, and at the same time, the frictional resistance is reduced, and a cake having a low moisture content with no variation can be obtained. And since the metal penetration belt stretched around the support belt does not have fine irregularities and a bent filtrate flow path on the surface, clogging does not proceed and the cake recovery rate is increased. Since the surface of the metal penetrating belt is flat, the cake can be washed away with a low water pressure and a small amount of washing water, and the filter medium surface can be regenerated. Steel belts have excellent wear resistance and peelability, slow clogging, and greatly reduce the exchange of filter media. Since the steel belt is thin, the diameters of the peeling roller and the guide roller are reduced.

  The horizontal belt filter according to the present invention will be described in detail with reference to the drawings. First, FIG. 1 is a transverse sectional view of the horizontal belt filter, in which the front and rear belt drive rollers 2 and the driven roller 3 supported by the frame 1 are made of rubber. Alternatively, a resin support belt 4 is wound around endlessly, and a driving machine (not shown) is interlocked and connected to the belt driving roller 2. FIG. 2 is a perspective view of the support belt, in which a large number of lattice-shaped seal bands 4a... Are formed on the entire back surface of the support belt 4, and through holes 5.・ Opened. The upper horizontal portion provided with through holes 5... In the support belt 4 wound around the belt driving roller 2 and the driven roller 3 is used as a filtration bed 4b. FIG. 3 is a front view of a belt drive roller for running the support belt, and drive claws 6 and 6 project from both end portions of the belt drive roller 2, and both end portions of the support belt 4 shown in FIG. The guide holes 7 formed continuously are engaged with each other to drive the support belt 4 and prevent meandering. Reference numeral 8 denotes a driving sprocket fitted to the belt driving roller 2.

  As shown in FIG. 1, a metal through belt 11 is endlessly wound around the front and rear peeling rollers 9 and guide rollers 10 supported on the frame 1, and the metal through belt 11 is stretched around the outer periphery of the support belt 4. It is. FIG. 5 is a front view of a peeling roller around which a metal penetrating belt is hung. Engaging claws 12 and 12 project from both end portions of the peeling roller 9, and as shown in FIG. The guide holes 13 formed continuously at both ends of 11 are engaged with the engaging claws 12 of the peeling roller 9. A metal penetration belt 11 is provided over the horizontal portion of the support belt 4, the horizontal portion of the support belt 4 is used as a filtration bed 4b, and the horizontal portion of the metal penetration belt 11 in contact with the support belt 4 is used as a filtration surface 11a. The belt 4 is driven and driven by the belt driving roller 2 to rotate the metal through belt 11 in contact with the belt, thereby preventing the metal through belt 11 from meandering. Note that the driven roller 3 and the guide roller 10 that wrap around the support belt 4 and the metal through belt 11 are pivotally supported on the frame 1 so as to be slidably adjustable.

  The metal penetration belt 11 stretched around the support belt 4 shown in FIG. 6 uses a thin stainless steel belt having a thickness of 0.1 to 0.5 mm and has a hole diameter of 0.1 to 0 in the thickness direction. A large number of fine holes of 5 mm are opened. The metal penetrating belt 11 has a hole diameter equal to or larger than the thickness of the filter medium in consideration of workability, strength, and dewatering performance. Hole processing of the thin metal through belt 11 can be performed by electron beam, laser beam, punching, chemical corrosion / etching, or the like. Since the thin metal through belt 11 is wound around the peeling roller 9 and the guide roller 10, the roller diameter can be set relatively thin. The thin metal penetrating belt 11 penetrating in the thickness direction has no stepped passage such as a twill weave like a twill weave like a filter cloth or a wire mesh, or a plain weave, and sludge stays in the fine holes of the thin plate, Or the component contained in a filtrate does not precipitate and adhere, and the recovery rate of a cake also becomes high. Since the metal penetration belt 11 has a flat surface, it can be easily cleaned, and both the water pressure and the water amount can be remarkably small. Moreover, since the metal penetration belt 11 is excellent in wear resistance and peelability and the progress of clogging is slow, the replacement of the filter medium is greatly reduced, and waste may be generated like a filter cloth which is a short-term consumable product. Absent. The metal penetration belt 11 can also be applied to high temperatures, solvents, and the like.

  As shown in FIG. 1, a stock solution supply box 14 is disposed on the start end side of the filtration surface 11 a of the metal through belt 11, and a vacuum box 15 is disposed on the back surface of the filtration bed 4 b of the support belt 4. FIG. 7 is a longitudinal sectional view of the main part of the horizontal belt filter. The size of the vacuum box 15 disposed on the back surface of the support belt 4 is as shown in FIGS. Is equivalent to the area. The support belt 4 is supported by a number of rotatable support rollers 16 that are pivotally supported on both side walls of the vacuum box 15, and the running support belt 4 is supported while rolling the support roller 16.

  As shown in FIG. 7, a seal box 17 is attached along the outer peripheral wall of the vacuum box 15, and a water injection path 18 for supplying water is formed on the upper surface of the seal box 17. The support belt 4 on which the filtration surface 11a of the metal penetrating belt 11 is placed is supported horizontally by a support roller 16 and a seal box 17 so as to be able to travel. The seal band 4a formed on the back surface of the support belt 4 is continuously slidably brought into contact with the water injection path 18 of the seal box 17 surrounding the periphery of the vacuum box 15, and the seal band 4a disposed in the width direction is provided. Intermittently sliding. The periphery of the filtration bed 4b of the traveling support belt 4 is sealed with water poured into the water injection path 18, and the negative pressure of the entire filtration surface 11a of the metal through belt 11 is maintained uniformly. Since the support belt 4 is brought into rolling contact with the support roller 16 and slidably contacted with the seal box 17 while being sealed with water, the sealing performance of the support belt 4 and the vacuum box 15 can be improved and the frictional resistance can be reduced at the same time. Reference numeral 19 denotes a guide plate provided with a sealing flexible plate, which is disposed on both sides of the filtration surface 11 a of the metal through belt 11.

  FIG. 8 is a longitudinal sectional view of the horizontal belt filter. A vacuum box 15 disposed on the back surface of the support belt 4 is connected to a suction tube 20 communicating with a vacuum source. The undiluted solution supplied from the undiluted solution supply box 14 to the filtration surface 11 a of the metal penetrating belt 11 is sucked by vacuum from the vacuum box 15, solid-liquid separation is performed by the metal penetrating belt 11, and the filtrate is discharged to the vacuum box 15. The stock solution supplied to the filtration surface 11a of the metal penetration belt 11 sucks the filtrate uniformly from the through hole 5 of the support belt 4 that opens to the entire surface of the filtration surface 11a, so that the moisture content is low and there is no variation in moisture. A cake is obtained. The active ingredient can be recovered well by washing the cake. Reference numeral 21 denotes a belt receiving roller of the support belt 4, and reference numeral 22 denotes a support roller of the metal through belt 11.

  The horizontal belt filter according to the present invention uses a metal through belt, pivotally supports a large number of support rollers on a vacuum box disposed on the entire filtration bed of the support belt, and provides a water injection path at the outer peripheral end of the vacuum box. Since a seal box is attached, the degree of vacuum of the water-sealed support belt is increased, and at the same time, frictional resistance is reduced, and a uniform cake can be recovered while maintaining the vacuum pressure of the entire filtration surface. By using a metal filter medium, the cake recovery rate can be increased, less washing water is required, clogging is less, and the filter has good peelability. Therefore, it is suitable for a production process in the chemical industry, the food industry, etc., or a horizontal belt filter intended for a stock solution such as metal hydroxide or pulp slurry.

It is a cross-sectional view of the horizontal belt filter according to the present invention. Similarly, it is a perspective view of a support belt. Similarly, it is a front view of the belt drive roller which runs a support belt. Similarly, it is a top view of the filtration bed of a support belt. Similarly, it is a front view of a peeling roller around a metal penetrating belt. Similarly, it is a top view of a metal penetration belt. Similarly, it is a principal part longitudinal cross-sectional view of a horizontal belt filter. Similarly, it is a longitudinal cross-sectional view of a horizontal belt filter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Belt drive roller 4 Support belt 4a Seal belt 4b Filtration bed 5 Through hole 6 Drive claw 7, 13 Guide hole 9 Peeling roller 11 Metal penetration belt 11a Filtration surface 12 Engagement claw 15 Vacuum box 16 Support roller 17 Seal box 18 Water injection channel

Claims (1)

Filter bed (4b) to the filtration surface of the filter belts running freely support belt (4) to (11a) and a heavy set, distribution a vacuum box (15) to the back surface of the filter bed of the support belt (4) (4b) In the solid-liquid separation apparatus provided, a metal penetrating belt (11) provided with a large number of pores penetrating in the thickness direction and a lattice-shaped sealing band (4a) on the back surface are formed between the sealing band (4a). A support belt (4) provided with a through hole (5) is overlapped, and a metal through belt is caused to rotate by driving the support belt, and a vacuum box (on the entire lower surface of the support belt (4) below the filtration bed (4b). 15), a number of rotatable support rollers (16...) Are supported on both side walls of the vacuum box (15), and a seal box (17) is attached to the outer periphery of the vacuum box (15). The water injection channel (on the upper surface of the seal box (17)) A horizontal belt filter characterized by forming 18).

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