JP2002153744A - Mixing/granulating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing/granulating machine which is capable of obtaining both of dispersing/nucleating action and granulating action by one machine. SOLUTION: An oblong vessel (1) is divided in axial direction into a mixing zone (K) and a granulating zone (P) by a partition wall (20). To the mixing zone (K) and the granulating zone (P) each of a first and a second rotation shafts provided with agitation blades (34, 37) is fitted. The first and the second rotation shafts are rotatively driven at each rotational speed. Also, a chopper blade (35) is installed in the mixing zone (K).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a horizontally long container partitioned axially by a partition wall into a mixing zone and a granulation zone, a rotary shaft rotatably provided in the container, An agitating blade attached to the rotating shaft, the workpiece supplied to the mixing zone is mixed in the mixing zone, and sent to the granulation zone through the opening of the partition wall, The present invention relates to a mixing / granulating apparatus which is granulated and discharged in the granulating zone.

[0002]

2. Description of the Related Art Dewatered cakes generated during the wastewater treatment process of water purification plants, highly hydrated clays generated at construction sites, and incinerated ash of coal, etc., are merely dumped from the viewpoint of consideration for the environment and from the viewpoint of effective use of resources. It is intended to be granulated and used as road materials, ground improvement materials, horticultural soils and the like. Various processing methods have been proposed for this purpose. For example, studies have been made to produce improved soil by adding mountain sand, a cement-based solidifying agent, and the like as a stabilizer to a dewatered cake generated in a wastewater treatment process of a water purification plant. Japanese Patent Application Laid-Open No. 11-156326 discloses that fly ash discharged from a coal-fired power plant is used by adding slaked lime and water to fly ash in order to use the fly ash as a landfill material, an embankment material, a civil engineering material and the like. There is shown a method of solidifying fly ash in which a wet kneaded material is obtained by rolling, granulated by rolling, and left in a carbon dioxide gas atmosphere to solidify.

[0003] On the other hand, a granulating apparatus is well known without mentioning a document name. For example, a combined granulating apparatus including a mixer, a pan-type pelletizer, and a rotary kiln is known. In addition, a granulating apparatus capable of granulating with a single apparatus, for example, a forced stirring type in which an object to be treated in a granulating vessel is stirred and mixed with stirring blades, and granulated, and a cylindrical vessel is rotated to drive the inside of a granulating apparatus. There are various types, such as a rolling granulation type that granulates the processed material, an extrusion type that rotates the screw in the cylinder and extrudes it from the end of the cylinder, and a vibration type that vibrates the tank in which the workpiece is placed. A granulating device is known.

[0004] According to the combination type granulator, the objects to be treated are mixed and stirred by a mixer, conveyed to a pelletizer by a belt conveyor, and the granules granulated by the retirer are conveyed to a rotary kiln by a belt conveyor, and The product can be obtained by drying. In addition, the forced stirring type granulator is
Schematically, it is composed of a granulation container and a stirring blade that is rotated and driven inside the granulation container, so that an object to be processed and water are supplied to the granulation container, and the stirring blade is rotated for a predetermined time. When driven, the mass is crushed and granulated.

[0005]

Generally, granules are obtained from the following two actions. That is, the object to be treated is mixed and dispersed by the stirring blade, and the dispersion and nucleation effect of obtaining a small nuclear granulated material serving as the core of the granulated material, and a large number of nuclei obtained by this dispersion and nucleation effect Mixing and agitating the mixed workpieces so as to make a large pulsating motion with the stirring blades,
And a granulating action of attaching an object to be treated around the nucleus and granulating to a predetermined size. In the nucleation action, it is necessary to disperse and mix the object to be treated in particle units. Therefore, it is desirable that the stirring blade is small and is driven to rotate at high speed. On the other hand, it is desirable that the stirring blade that performs the nucleation action is driven to rotate at a large speed at a low speed.

According to the conventional combination type granulator, since the mixer and the pelletizer are independent, it is possible to reduce the size of the stirring blade of the nucleating mixer and to rotate the mixer at a high speed. it can. on the other hand,
The agitating blades of the pelletizer can be configured to be large and driven to rotate at low speed. Therefore, the mixer can make full use of the functions of the mixer and the pelletizer can make full use of the respective functions of the pelletizer, and there is an advantage that a desired product of high quality can be obtained. However, since two devices, a mixer and a pelletizer, are required and a rotary kiln is required in some cases, there is a disadvantage that the granulation device becomes large and expensive. Therefore,
It also increases the cost of the product. Further, during the granulation, the object to be processed must be transferred from one mixer to the other pelletizer and mixed and granulated again, so that the processing efficiency is reduced and the cost of the product is also increased. For this reason, the above-mentioned combination type granulator is not suitable as an inexpensive apparatus for treating an object to be treated such as sludge.

[0007] Further, in the forced stirring type granulator, a lump is crushed to some extent by the stirring blade and granulated.
For example, it can be said that it is suitable for granulation of a lump such as a dehydrated cake. However, since the granulated material is obtained by both the dispersing / nucleating action and the granulating action which are incompatible as described above, it is difficult to obtain both actions simultaneously with one granulator, and there is a granulated substance. There is a disadvantage that when grown to a size, it is destroyed and does not become a large granulated product.

The present invention aims at providing a mixing / granulating apparatus which solves the above-mentioned conventional problems, and more specifically, a mixing / granulating apparatus having both the dispersing / nucleating action and the granulating action.・ The purpose is to provide a granulating device at low cost.
Another object of the present invention is to provide a mixing / granulating apparatus capable of performing a drying process during granulation in addition to the above objects.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to select a horizontally long container as a mixing zone and a granulation zone, and to drive the stirring blade at a speed suitable for each zone. Achieved. That is, in order to achieve the above object, the invention according to claim 1 has a horizontally long container partitioned by a partition wall into a mixing zone and a granulation zone in an axial direction, and is provided rotatably in the container. A rotating shaft, and a stirring blade attached to the rotating shaft, the workpiece to be supplied to the mixing zone is mixed in the mixing zone, and passed through the opening of the partition wall, A mixing / granulation device which is sent to a granulation zone, and is granulated and discharged in the granulation zone, wherein the mixing zone has a relatively high speed in addition to the stirring blades. It is configured such that a rotatably driven chopper blade is provided. According to a second aspect of the present invention, there is provided a horizontally long container partitioned by a partition wall into a mixing zone and a granulation zone in an axial direction, and a first container rotatably provided in the mixing zone of the container. A rotation axis, a second rotation axis rotatably provided in the granulation zone of the container,
And a stirring blade attached to the rotating shaft of No. 2,
The workpiece supplied to the mixing zone is mixed in the mixing zone, sent to the granulation zone through an opening of the partition wall, granulated in the granulation zone, and discharged. A mixing and granulating apparatus, wherein the first,
The two rotation shafts are configured to be driven to rotate at respective rotation speeds. According to a third aspect of the invention, in the mixing zone of the second aspect, a chopper blade that is driven to rotate at a relatively high speed is provided in addition to the stirring blade. A heating jacket is provided on an outer peripheral portion of the container located in the granulation zone according to any one of claims 1 to 3, and the invention according to claim 5 is a method according to any one of claims 1 to 4. It is configured such that the area of the opening of the described partition wall is adjustable. The invention according to claim 6 is characterized in that a horizontally long container, a granulating drum provided concentrically with the container, a rotatable drive provided in the container, and a stirring blade attached to an outer peripheral portion thereof. A partition wall comprising a rotating shaft and a drum drive shaft for rotatingly driving the granulation drum, wherein the workpiece to be supplied to the container is mixed in the container, and a partition wall closing an end of the container. A mixing / granulation apparatus which is sent to the granulation drum through an opening of the granulation drum and is granulated and discharged by the granulation drum, wherein the rotating shaft and the drum driving shaft are They are arranged concentrically and are configured to be rotationally driven at respective rotational speeds. The invention according to claim 7 is configured such that a chopper blade that is driven to rotate at a relatively high speed is provided in the container according to claim 6 in addition to the stirring blade.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing a mixing / granulating apparatus according to a first embodiment, in which (a) shows an entirety and (b) shows an embodiment of a partition wall,
As shown in FIG. 1, the mixing / granulating apparatus according to the first embodiment includes a horizontally long container 1 which is disposed so that an axis thereof is horizontal. This horizontally long container 1
In FIG. 1A, the left side is selected as the mixing zone K and the right side is selected as the granulation zone P. According to the first embodiment, one zone extends between these zones K and P.
A common rotary shaft 30 is provided so as to be rotatable.

The container 1 has a substantially cylindrical shape. In the present embodiment, objects to be treated, such as powder, highly hydrated clay, incinerated ash of coal, and dewatered cake, are supplied to the mixing zone K from the left end of the container 1 and sent to the right. In the process of dispersing and mixing, nuclei are formed, and then sent to the granulation zone P and granulated, and if necessary, the dried product is discharged from the vicinity of the right end of the granulation zone P. I have. For this purpose, an object supply port 2 is provided above the vicinity of the left end of the container 1, and a product outlet 3 is provided below the right end of the container 1. A mechanical quantitative supply device 10, which will be described later, is provided corresponding to the workpiece supply port 2, and a chute 3 ′ is provided corresponding to the product discharge port 3.
Further, in the mixing zone K, spray nozzles 4, 4,... For supplying a binder are attached at positions closer to the upstream side,
Binders such as water and chelate are uniformly sprayed on the object to be processed during dispersion and mixing.

As described above, both sides of the container 1 provided with the processing object supply port 2, the product discharge port 3, etc.
Closed at 5 '. Further, a partition wall 20 that partitions the mixing zone K and the granulation zone P is attached at a position from the center of the container 1. The partition wall 20 is attached so as to traverse and close the container 1. In the present embodiment, as shown in FIG. It is divided into upper and lower parts with the center as the center, and it is made into a substantially triangular shape. The opening areas of the workpiece passage holes 21 are adjusted by adjusting plates 22, 22 slidable in the left-right direction. For this purpose, screw rods 23,
23 are attached. On the other hand, on the outside of the container 1,
Nuts 24, 24 having female threads formed therein are fixed. The screw rods 23 are screwed into nuts 24, 24, respectively.

Therefore, when the handles 25, 25 attached to the upper ends of the screw rods 23, 23 are turned in the forward and reverse directions, the screw rods 23, 23 move in the left and right directions in FIG. The plates 22, 22 slide in the left-right direction, and the opening areas of the processing object passage holes 21, 21 are adjusted. In the embodiment shown in FIG. 1 (b), the adjusting plates 22, 22 are configured to be slidably driven in the left-right direction, but may be slid in the up-down direction. As described above, according to the present embodiment, since the two processing object passage holes 21 are formed, one opening area is increased in accordance with the rotation direction of the stirring blades 34 described below. However, adjustments such as making the other narrower can be performed freely.

A heating jacket 6 is provided on the outer peripheral wall of the granulation zone P of the container 1 configured as described above. The heating jacket 6 includes an inner peripheral wall of the container 1 and an outer peripheral wall provided at a predetermined distance from the inner peripheral wall. The inside of the heating jacket 6 configured as described above serves as a flow path of the heating steam, but a baffle plate, so that the heating steam does not short-circuit in the heating jacket 6.
A guide plate or the like is appropriately provided. Heating jacket 6
In FIG. 1A, a steam connector 7 is attached to the lower right end. An exhaust connector 8 is attached to the upper portion of the heating jacket 6 on the left side in FIG.
The steam supplied from the steam connector 7 heats the inside of the granulation zone P, and is returned from the exhaust connector 8 to a boiler (not shown), heated again by the boiler, and supplied from the heating connector 7 into the heating jacket 6. It has become. Note that a spray nozzle 4 for supplying a binder is also provided on the upstream side of the granulation zone P of the container 1. Also,
An exhaust pipe 9 for discharging steam during drying is also attached to the granulation zone P.

In the present embodiment, a single common rotating shaft 30 is provided in a horizontal direction coaxially with the axis of the inside of the container 1 configured as described above. Rotating shaft 30
, Both ends of which extend outward from the container 1 through the side walls 5, 5 'and are rotatably supported by first and second bearings 31, 31'. Then, outside the first bearing 31, it is driven to rotate by a driving device 32 including a motor, a belt, and the like. According to the present embodiment, the motor is provided with an inverter,
The rotation speed of the rotation shaft 30 can be arbitrarily adjusted.

A portion of the rotating shaft 30 whose rotation speed is arbitrarily adjusted is located in the mixing zone K, and is provided with a plurality of arms 33, 33, 33, 33 at predetermined intervals in the axial direction and the rotation angle direction. Are fixed, and these arms 33, 3
The stirring blades 34, 34,... Are attached to 3,. In the present embodiment, the stirring blades 34, 34,... Have a plow shape, that is, a shovel shape, and the object to be treated is suspended and dispersed by the stirring blades 34, 34,. According to the embodiment shown in FIG. 1, inside the mixing zone K of the container 1, besides the stirring blades 34, 34,.
5,... Are provided. These chopper blades 3
Are provided in the vicinity of the lower portion of the processing object supply port 2 of the container 1 so as not to interfere with the stirring blades 34, 34,..., Are lifted by the stirring blades 34, 34,. The object to be processed is sheared and dispersed, and the stirring blades 34, 34,
Irrespective of..., Is driven to rotate at a relatively high speed independently. Since the chopper blades 35, 35,... Are provided in the mixing zone K, even if the rotary shaft 30 is driven to rotate at a relatively low speed suitable for the granulating action, the object to be processed is sufficiently formed. Shearing and dispersing effects.

According to the present embodiment, a plurality of rotating shafts 30 located in the granulation zone P are spaced at a predetermined interval in the axial direction and relatively sparsely in the rotating direction, for example, at 180 ° intervals. Are fixed, and plate-shaped granulating blades 37, 37,... Which are long in the axial direction are attached to the distal ends of these arms 36, 36,.

The mechanical quantitative supply device 10 includes a screw 12 driven to rotate by a motor 14.
A hopper 13 is provided above the hopper 13. Therefore, when the screw 12 is driven to rotate at a predetermined speed by the motor 14, the object to be processed in the hopper 13 is supplied to the container 1 at a predetermined ratio. The mixing and granulating apparatus according to the present embodiment also includes a control device and can automatically granulate.
The control device is not shown in FIG.

Next, the granulating action of the above embodiment will be described. The rotating device 30 is driven by the driving device 32 at a relatively low speed. Further, the heating steam is supplied to the heating jacket 6. The screw 12 is driven to rotate at a predetermined speed. Then, the processing object in the hopper 13 is supplied to the mixing zone K of the container 1 at a predetermined ratio. The object to be processed is lifted by the stirring blades 34, 34,..., Dropped, and mixed. At this time, the chopper blades 35, 3
According to 5, ..., the object to be treated is mixed and
Sheared and dispersed. The binder is sprayed from the spray nozzles 4, 4,. This produces small nuclear granules.

The object to be treated, in which the nucleated granules are mixed, is stirred by the stirring blades 34, 34,.
It is continuously fed to the downstream granulation zone P through 1, 21. At this time, the processing object passage hole 21 of the partition wall 20,
The residence time of the mixing zone K is adjusted by the opening area of 21 to appropriately adjust the degree of dispersion / mixing or the degree of formation of the nucleated granules. The binder is sprayed from the spray nozzle 4 as needed. Then, stirring is performed by the granulating blades 37, 37,... Attached to the rotating shaft 30.
At this time, the object to be treated adheres to the outer peripheral surface of the nuclear granulated material and is granulated. It is dried while being granulated, and is continuously discharged as a product from the chute 3 '.

At this time, the mounting intervals of the granulating blades 37, 37,... In the axial direction of the rotating shaft 30 are, for example, 180 degrees.
It is granulated to a predetermined size and discharged from the product discharge port 3.
As described above, according to the present embodiment, the granulation is performed by the common rotating shaft 30 at a relatively low speed by one mixing / granulating device, but the mixing zone K is driven to rotate at a relatively high speed. Since the chopper blades 35, 35, ... are provided,
The objects to be processed are sufficiently mixed and dispersed, and nucleated.
Also, since the rotating shaft 30 is driven to rotate at a relatively low speed,
The fragile workpiece is also granulated to a predetermined size without breaking. As described above, it is apparent that chemicals, foods and the like other than minerals such as dehydrated cake, clay and incinerated ash can be similarly treated.

The first embodiment can be variously modified. For example, as shown in FIG. 2A as a second embodiment, a third bearing 31 ″ is provided at the center of the partition wall 20 of the embodiment shown in FIG. , The rotating shaft 30 is divided into a first rotating shaft 30k located in the mixing zone K and a second rotating shaft 30p located in the granulation zone P, and the first bearing 31 " It is also possible to implement so that the end of the rotating shaft 30k and the end of the second rotating shaft 30p are respectively supported.
When the rotating shaft 30 is divided in this way, the first rotating shaft 30
k can be driven to rotate at a relatively high speed suitable for mixing / dispersion and nucleation, and the second rotating shaft 30p can be driven to rotate at a relatively low speed suitable for granulation. Also, the structure of the stirring blades 34, 34,... And the granulating blades 37, 37,. Further, when the first rotary shaft 30k is driven to rotate at a high speed, sufficient mixing / dispersion and nucleation action can be obtained, so that the chopper blades 35, 35,... Can be omitted.

FIGS. 2B and 2C show a third embodiment of the present invention. The same members as those in the first and second embodiments described above are denoted by the same reference numerals or symbols, and will not be described repeatedly. However, according to the third embodiment, the granulation zone P is It is configured. More specifically, a plurality of arms 41, 41,... Are attached to the second rotating shaft 30p, and the granulating drum 40 is integrated with the second rotating shaft 30p by these arms 41, 41,. The drive unit 32 'is driven to rotate. The diameter of the granulation drum 40 on the partition wall 20 side is reduced by a tapered wall 42. The workpiece in the mixing zone K is transferred from the workpiece passing holes 21, 21 of the partition wall 20 by the guide 43 to the granulating drum 4.
0 is supplied. The right end of the granulating drum 40 is closed by an end plate 45. As shown in FIG. 2C, the end plate 45 has a plurality of concentric arc-shaped products. Outlet 46,
46,. Therefore, the granulating drum 4
Even when the zero is driven to rotate, the product is discharged substantially continuously from the product discharge ports 46, 46,.

According to the third embodiment, for example, the second
By rotating the rotation shaft 30p of the first rotation shaft 30 at a low speed, the rotation of the cylindrical container described in the section of the prior art is performed and the inside of the object to be processed is granulated. It is clear that granulation is possible. At this time, it is apparent that a blade for scooping the object to be processed, a guide member for guiding the product to the product outlets 46, 46, etc. can be provided on the inner peripheral wall of the granulation drum 40. Further, it is apparent that the chopper blades 35, 35,... Can be omitted by rotating the first rotation shaft 30k at a high speed. In the embodiment shown in FIG. 2B, the main body of the container 1 extends to the granulation drum 40, but the embodiment can be performed without the granulation drum 40. Also,
Although not shown in the drawing, the inside of the granulation drum 40 can be heated by a heater or the like provided on the outer peripheral portion. The steam generated at this time is exhausted from the exhaust pipe 9.

[0025]

As described above, according to the present invention, a horizontally long container partitioned by a partition wall into a mixing zone and a granulation zone in the axial direction, and provided rotatably in the container. A rotating shaft, and a stirring blade attached to the rotating shaft, the workpiece supplied to the mixing zone is mixed in the mixing zone, and the granulation zone is passed through an opening of the partition wall. The mixing zone of the mixing / granulating apparatus, which is configured to be sent to the granulating zone and granulated and discharged in the granulating zone, includes, in addition to the stirring blade, a chopper blade that is driven to rotate at a relatively high speed. Is provided, even if the stirring blades are driven to rotate at a relatively low speed suitable for granulation, the processing target is sufficiently dispersed and mixed by the chopper blades in the mixing zone, and granulation nuclei are formed. Is done. Therefore, according to the present invention, an effect peculiar to the present invention is obtained in that a mixing / granulating apparatus can be obtained at low cost, although both the dispersing / nucleating action and the granulating action are exhibited.
According to another invention, the first and second rotation shafts provided in the mixing zone and the granulation zone are driven to rotate at respective rotation speeds. The rotation can be performed at a rotation speed suitable for granulation, and at a rotation speed suitable for granulation. Further, since there is no chopper blade for shearing / dispersing, the object to be treated is sufficiently dispersed / mixed and a granulation nucleus is formed. Therefore, a high-quality product can be obtained at low cost with an inexpensive mixing and granulating apparatus. According to still another invention, since a heating jacket is provided on the outer peripheral portion of the container located in the granulation zone, in addition to the above-described effects, an effect of obtaining a dried product simultaneously with granulation can be obtained.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a first embodiment of the present invention, in which (A) is a cross-sectional view showing the whole, and (B) is a side view of a partition wall.

FIG. 2 is a diagram schematically showing another embodiment of the present invention.
(A) is a cross-sectional view showing only the partition wall portion of the second embodiment, (B) is a cross-sectional view showing only the main part of the third embodiment, and (C) is an end plate. It is a side view.

[Explanation of symbols]

Reference Signs List 1 container 4 spray nozzle 6 heating jacket 20 partition wall 30 rotating shaft 30k first rotating shaft 30p second rotating shaft 32 "third bearing 34 stirring blade 35 chopper blade 37 granulating blade 40 granulating drum

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01F 15/06 B01F 15/06 Z (72) Inventor Satoshi Noguchi 7-5-2 Higashi Narashino, Narashino City, Chiba Prefecture Ohira F-term in Yoki Co., Ltd. (reference) 4G004 FA02 FA04 FA05 4G037 AA03 AA12 CA03 DA01 DA23 DA30 EA03 4G078 AA13 AB11 BA01 BA07 CA02 CA05 CA15 CA17 DA01 DA03 DA26 DA28 DC10 EA03 EA08 EA10

Claims (7)

[Claims] 1. A horizontally long container partitioned axially by a partition wall into a mixing zone and a granulation zone, a rotary shaft rotatably provided in the container, and a rotary shaft attached to the rotary shaft. The workpiece to be supplied to the mixing zone is mixed in the mixing zone, and is sent to the granulation zone through the opening of the partition wall, and is formed in the granulation zone. A mixing / granulating apparatus adapted to be granulated and discharged, wherein, in addition to the stirring blade, a chopper blade that is driven to rotate at a relatively high speed is provided in the mixing zone. Characteristic mixing and granulating equipment. 2. A horizontally long container partitioned axially by a partition wall into a mixing zone and a granulation zone, and a first rotating shaft rotatably provided in the mixing zone of the container. A second rotating shaft rotatably provided in the granulation zone of the container, and stirring blades attached to the first and second rotating shafts, which are supplied to the mixing zone. Is mixed in the mixing zone, sent to the granulation zone through the opening of the partition wall, and granulated and discharged in the granulation zone. A mixing and granulating apparatus, wherein the first and second rotating shafts are driven to rotate at respective rotation speeds. 3. A mixing and granulating apparatus according to claim 2, wherein a chopper blade rotatably driven at a relatively high speed is provided in addition to the stirring blade in the mixing zone according to claim 2. 4. The mixing and granulating apparatus according to claim 1, wherein a heating jacket is provided on an outer peripheral portion of the container located in the granulating zone. 5. A mixing and granulating apparatus according to claim 1, wherein the area of the opening of the partition wall is adjustable. 6. A horizontally long container, a granulating drum provided concentrically with the container, and a rotating shaft provided rotatably in the container and having stirring blades mounted on the outer periphery thereof. And a drum drive shaft for rotatingly driving the granulation drum, wherein an object to be supplied to the container is mixed in the container, and an opening of a partition wall closing an end of the container is formed. A mixing / granulation device adapted to be sent to the granulation drum through the granulation drum and discharged by the granulation drum, wherein the rotating shaft and the drum driving shaft are arranged concentrically A mixing / granulating apparatus characterized in that the mixing and granulating apparatus is configured to be rotationally driven at each rotational speed. 7. A mixing and granulating apparatus according to claim 6, wherein a chopper blade rotatably driven at a relatively high speed is provided in addition to the stirring blade in the container according to claim 6.