JP6206432B2 - Dry density separator for powder and dry density separation method for powder - Google Patents

Description

The present invention relates to a dry density separation device for a granular material that separates the granular material using a density difference, and in particular, separates a granular material with a small density difference with high accuracy. The present invention relates to a dry density separation apparatus capable of performing the following.
Moreover, this invention relates to the dry-type density separation method of the granular material using the said dry-type density separation apparatus.

  Separation of powder particles according to physical properties from a mixture of a plurality of powder particles is performed in various industrial fields, and in particular, there is a high demand for devices capable of separating powder particles with high accuracy. There is. For example, in the steel field, a technique for separating refractories with high accuracy is required as described below.

  Various refractories are used in the iron and steel process, especially in the ironmaking and steelmaking processes. Moreover, not only one type of refractory is used alone, but also multiple types of refractories are combined in accordance with the characteristics. It is widely used.

A typical example is a tundish that is an intermediate container that temporarily holds molten steel in continuous casting. As shown in FIG. 1, in the tundish 1, a lining 4 made of a refractory is provided on the inner surface of an iron skin 3 formed in a box shape or a boat shape, and the lining 4 is rich in Al ₂ O ₃ . The work material 5 and the SiO ₂ rich permanent material 6 are composed of two layers.

Refractories used in such applications are worn by contact with hot metal, molten steel, slag, and the like, and are dismantled and disposed of when they are less than a specified thickness. However, disposal of used refractories as industrial waste as it is is not only expensive, but it would otherwise dispose of reusable refractories, which is undesirable from the viewpoint of resource conservation. . Therefore, it is required to reuse the used refractory in some form.

However, used refractories contain multiple refractories as described above, and also contain components other than refractories such as bullion and slag. Is difficult. In order to effectively use the used refractory, it is necessary to sort out the contained materials. In particular, expensive materials such as Al ₂ O ₃ rich work materials are separated and recovered with high purity. If possible, it is extremely practical.

As a method for separating a mixture of a plurality of materials as in the above example, a method using density difference is known. For example, in the case of the refractory, since the density of Al ₂ O ₃ is 3.95 to 4.10 g / cm ³ and the density of SiO ₂ is 2.20 g / cm ³ , the density difference is utilized. It is considered that the work material rich in Al ₂ O ₃ and the permanent material rich in SiO ₂ can be separated.

The separation method using the density difference is called a density separation method, a specific gravity separation method, or the like, and various methods have been proposed, but can be roughly divided into a wet method and a dry method. The wet method is a separation method that uses water or a liquid adjusted in density called heavy liquid as a medium, and is a method that separates suspended matter and sediment using the density difference between the object and the medium. Since this wet density separation method can be applied mainly to those having a density of about 1.0 to 3.0 g / cm ^3, it is used for separation of waste plastics, light metals and the like in the field of waste recycling. However, in the wet method, in addition to limiting what can be separated depending on the density of the medium, there are problems that a drying step is required after the separation, and that the used medium needs to be subjected to waste liquid treatment.

  On the other hand, there are two types of dry separation methods that do not use a liquid: those that use a medium and those that do not. The dry method using a medium is a method in which powder particles such as glass beads and alumina sand are used as a medium, and an object is density-separated inside the medium fluidized by blowing or vibration. Although this method does not require a drying step as in the wet method, since it is necessary to separate the object and the medium by sieving after separation, the range of application is that of relatively large particles. Limited to separation.

  In contrast, in a dry density separation method that does not use a medium, the granular material itself that is a separation target is fluidized by an air flow, and separation is performed using a density segregation phenomenon in the formed fluidized bed. If this method is used, it is not necessary to remove the medium by sieving after separation as in the case of using the medium, and it can be applied to particles having a relatively small particle size. At the same time, studies have been made to improve the separation accuracy.

  For example, Patent Documents 1 to 4 all relate to a technique for improving the separation accuracy of a dry density separation method that does not use a medium. In Patent Document 1, powder is generated by generating a circulating flow in a fluidized tank. It has been proposed to positively move the granules and thereby improve the separation accuracy. In Patent Documents 2 to 4, it is proposed that vibration is given to the fluidized granular material in the dry density separation.

JP 2013-173145 A Japanese Patent Laid-Open No. 06-233971 JP 2006-150231 A JP 07-256213 A

However, the dry density separation method has a problem that it is difficult to separate particles having a small density difference. For example, in the case of the above-mentioned tundish work material and permanent material, although there is a difference in density, the difference is as small as about 0.2 g / cm ³ . When trying to separate materials with such a small density difference by the dry density separation method, the phenomenon of embracing a lightweight material by a heavy material at the bottom of the fluidized bed or the influence of the frictional force acting between particles in the fluidized bed. Is relatively large, it is difficult to effectively cause a density segregation phenomenon.

  Further, in the method described in Patent Document 1, since the circulating flow is generated in the fluid tank, when the density difference of the separation object is small as described above, the separation object is completely in the fluid tank. It was mixed and it was difficult to perform separation.

  In the methods described in Patent Documents 2 to 4, density segregation is promoted by applying vibration to the granular material, but the separation accuracy for the granular material having a small density difference has not been sufficient.

  The present invention has been developed in view of the above circumstances, and provides a dry density separation apparatus and a dry density separation method for a powder that can be separated with high accuracy even for a powder having a small density difference. The purpose is to provide.

  As a result of intensive studies to achieve the above-mentioned object, the inventors vibrated the entire fluid tank in dry density separation, and arranged the granular materials separated by the density segregation phenomenon on the wall surface of the fluid tank. It has been found that by taking out from a plurality of outlets provided, even a granular material having a small density difference can be separated with high accuracy. The present invention is based on the above findings. Here, the density segregation phenomenon means that particles having a relatively high density move in the direction of gravity (down), particles having a relatively low density move in the direction opposite to gravity (up), As a result, it refers to a phenomenon in which the powder particles in the fluidized bed are biased (separated).

That is, the gist configuration of the present invention is as follows.
1. A dry density separation apparatus for powder,
An apparatus body including a fluid tank and an air chamber communicated with each other via a dispersion plate;
A granular material inlet for charging the granular material into the fluidized tank;
Fluidized air supply means for supplying fluidized air for fluidizing the granular material from the dispersion plate into the fluidized tank via the air chamber;
A fluidizing air outlet for exhausting the fluidizing air from the fluidizing tank;
Vibration means for vibrating the whole fluid tank;
A dry density separation apparatus for a granular material having a plurality of outlets provided side by side on the wall surface of the fluidized tank for discharging the granular material separated in density in the fluidized tank in a separated state .

2. 2. The dry density separation apparatus for powder particles according to 1, wherein among the plurality of discharge ports, at least one pair of adjacent discharge ports is partitioned by a movable partition member.

3. The dry density separation apparatus for powder particles according to 1 or 2, wherein the vibration frequency of the vibration means is a natural frequency of the fluid tank.

4). Using the dry density separator for powder according to any one of 1 to 3 above, the dry density of the powder that separates the powder while vibrating the entire fluid tank by the vibration means. Separation method.

  According to the dry density separation apparatus and the dry density separation method for powder according to the present invention, even a powder having a small density difference can be separated with high accuracy. Such separation devices and methods are extremely useful for the separation of various materials, including used refractories discharged at steelworks.

It is the schematic which shows the structure of a general tundish. It is the schematic of the dry-type density separation apparatus of the granular material in 1st embodiment of this invention. It is the schematic of the dry-type density separation apparatus of the granular material in 2nd embodiment of this invention. It is a graph which shows the influence which excitation has on separation accuracy. It is a graph which shows the influence which a vibration frequency has on separation accuracy.

Next, a method for carrying out the present invention will be specifically described based on the embodiment.
In the following description, unless otherwise specified, terms such as “up”, “down”, “horizontal”, “vertical”, and the like represent the positional relationship when the dry density separator of the granular material of the present invention is installed. Use as

  The dry density separation apparatus for powder according to the present invention includes a device main body including a fluid tank and an air chamber communicated with each other via a dispersion plate, a powder inlet for feeding the powder into the fluid tank, and Fluidized air supply means for supplying fluidized air for fluidizing the granular material from the dispersion plate into the fluidized tank via the air chamber, and exhausting the fluidized gas from the fluidized tank. A fluidizing gas exhaust port for oscillating, a vibrating means for vibrating the fluidizing tank as a whole, and the fluidizing tank for discharging the granular material separated in density in the fluidizing tank in a separated state. And a plurality of outlets provided side by side on the wall surface.

[Powder]
The dry density separation apparatus and the dry density separation method of the present invention are intended to treat powder particles. The powder particles are not particularly limited, and any powder can be used as long as it is a mixture of a plurality of powder particles made of materials having different densities. When separating large sized materials such as used refractories, separation is performed after pulverization to a particle size suitable for density separation. Although the particle size of the powder is not particularly limited, the wind speed required for fluidization increases in proportion to the square of the particle size, so that if the particle size becomes excessively large, fluidization of the powder becomes difficult. Further, when the wind speed is increased to fluidize such coarse particles, the particles collide violently by the air flow in the fluidized bed, and the destruction and wear of the particles become remarkable. Therefore, the particle size of the granular material is preferably 3 mm or less. On the other hand, when the particle size is reduced to a corner, the particles adhere and aggregate, and fluidization becomes difficult. Therefore, it is preferable that the particle size of the granular material is 0.02 mm or more.

[Device main unit]
The dry density separation apparatus of the present invention has an apparatus body including a fluid tank and an air chamber communicated with each other via a dispersion plate. The said fluid tank is a part for accommodating a granular material in the inside and forming a fluidized bed with air. And the said air chamber is a part which accommodates temporarily, before supplying the fluidization air for making a granular material flow to the said fluid tank. The fluid tank and the air chamber are partitioned by a dispersion plate. As the dispersion plate, a plate-like member made of a porous material having holes of a size that allows air to pass but does not allow powder particles to pass through can be used.

[Fluidized air supply means]
Air for fluidizing the powder particles is supplied from the fluidizing air supply means to the fluidizing tank through the holes of the dispersion plate via the air chamber. Thus, since air is supplied through the air chamber and the dispersion plate, air can be supplied more uniformly than when air is directly sent to the fluid tank. As the fluidized air supply means, any device such as a blower can be used as long as it can supply an amount of air necessary for fluidization.

[Fluidized air exhaust port]
The fluidizing tank is provided with a fluidizing air exhaust port for discharging the air supplied from the fluidizing air supply device into the fluidizing tank. The fluidized air exhaust port may be an opening or an exhaust pipe for performing natural exhaust, and it is not necessary to forcibly exhaust with a blower or the like. In addition, if the granular material to be treated includes particles that have a possibility of being discharged in the airflow, such as those with a small particle size, a cyclone type dust collection is provided at the tip of the fluidized air exhaust port. You may connect traps, such as a device and a filter.

[Excitation means]
In the present invention, vibration means for vibrating the entire fluid tank is provided, and the entire fluid tank is vibrated during the separation process. Although the density segregation of the granular material in the fluidized tank can be promoted by performing the vibration, a vibration means (vibrator) is installed in the fluidized bed as in the apparatus described in Patent Document 3. In this case, although the powder particles in the vicinity of the vibration means are promoted in density segregation, the vibration effect cannot be obtained in a portion where vibration does not propagate. Therefore, in the present invention, it is important to give an effect of promoting density segregation by vibration to the entire powder and granular materials existing in the fluidized tank by vibrating the fluidized tank. In addition, vibrating the whole fluid tank here means vibrating at least the whole fluid tank. For example, when the fluid tank and the air chamber are integrally formed, both may vibrate. Moreover, the other member couple | bonded with the fluid tank may vibrate with a fluid tank.

  The method of vibrating the fluid tank is not particularly limited, and a vibration means attached to the fluid tank may be used, or the fluid tank is indirectly vibrated by vibrating other members connected to the fluid tank. Also good. For example, when the fluid tank and the air chamber are integrally formed, vibration means may be attached to the air chamber to vibrate both.

  The vibration means is not particularly limited, and any vibration means can be used as long as it can vibrate the entire fluid tank. As an example of the vibration means that can be suitably used, there is a rotating mechanism of an eccentric mass attached to a motor shaft. In addition, it is preferable that the apparatus main body containing a fluid tank is supported so that vibration is possible using elastic bodies, such as a coil spring, so that it can vibrate. Further, as a member such as a pipe connected to the apparatus main body, it is preferable to use a member having mobility or flexibility so as to follow the displacement of the apparatus main body due to vibration.

  The vibration frequency of the vibration means is not particularly limited and can be any value as long as the fluid tank can be vibrated to promote density segregation. Is preferable because density segregation can be caused more effectively. In addition, the natural frequency of the fluid tank is obtained by striking the fluid tank with an impulse hammer, analyzing the frequency of the ratio (gain) of the acceleration and impact force of free damping vibration caused by the impact, and reading the frequency indicating the peak value. Can be sought.

[Vent]
Furthermore, the dry density separation apparatus of the present invention has a plurality of discharge ports provided side by side on the wall surface of the fluid tank for discharging the granular material that has been density separated in the fluid tank in a separated state. doing. By providing a plurality of discharge ports side by side, the granular material separated by the density segregation phenomenon can be taken out from each of the discharge ports without being mixed. In the following description, the granular material discharged from each outlet is referred to as a fraction.

  In the devices described in Patent Documents 2 and 3, among the granular materials separated by density segregation, those having a high density are discharged from below the device, while those having a low density are sucked from above the device. And discharged. Such a method is effective for a granular material having a density difference of a certain degree or more, but it is difficult to separate a granular material having a small density difference. Furthermore, the above method cannot be applied to powders or the like that cannot be discharged by suction, such as those having a large particle diameter or high density. Moreover, in the apparatus described in patent document 4, by giving a vibration with respect to the fluidized granular material, a high-density granular material is made downstream, and a low-density granular material is made upstream. Each is separated by moving. Even with this method, it is only possible to separate powder particles having a large density difference to the extent that they clearly flow in the opposite direction in the fluidized bed. On the other hand, in the present invention, the granular material segregated in density in the fluidized tank only needs to be discharged from a plurality of outlets provided side by side on the wall surface of the fluidized tank. Can be separated with high accuracy. In addition, since it is not necessary to suck and discharge the granular material, not only the cost and installation location for installing the equipment for suction collection are unnecessary, but also the granular material with a large particle size or the high density powder. It can also be used for separation of powders and particles that are difficult to be discharged by suction.

  The plurality of discharge ports may be independent discharge ports, or may be a plurality of discharge ports by dividing the inside of one large discharge port. Further, the arrangement of the discharge port is not particularly limited, and can be any arrangement, but from the viewpoint of discharging the density-separated powder particles while maintaining the separated state, It is preferable to arrange them in the vertical direction. The number of outlets may be two or more, and the upper limit is not particularly limited. However, even if the number is excessively large, not only the apparatus becomes complicated, but there is almost no difference in the components in the fractions obtained from adjacent outlets. Generally, it is 20 or less. The respective outlets may all have the same size (opening area), but may have different sizes so that a fraction having a desired composition can be obtained. Of the plurality of outlets, it is preferable to partition at least one pair of adjacent outlets with a movable partition member because the composition of the fraction taken out from these outlets can be adjusted.

  Next, embodiments of the present invention will be specifically described with reference to the drawings. The following embodiments show preferred examples of the present invention, and the present invention is not limited by the description. Embodiments of the present invention can be modified as appropriate within the scope of the gist of the present invention, and any of them can be included in the technical scope of the present invention.

[First embodiment]
The schematic of the dry-type density separation apparatus of the granular material in 1st embodiment of this invention is shown in FIG. In the dry density separation apparatus 10 of the present embodiment, the air chamber 13 and the fluid tank 14 are formed by dividing the inside of the apparatus main body 11 made of an acrylic circular tower vertically by a dispersion plate 12. On the side surface of the air chamber 13, a vibration exciter 15 combining a servo motor and an eccentric mass as vibration means is attached so as to vibrate the apparatus main body 11 in a substantially vertical direction. Is supported by an elastic support member 16 including

  An air supply port 17 is provided in the air chamber 13, and a blower (not shown) as fluidized air supply means is connected to the air supply port 17. On the other hand, a granular material inlet 18 and a fluidized air outlet 19 are provided in the upper part of the fluid tank 14. In addition, a discharge port 20 is provided on one side surface of the fluid tank, and the discharge port 20 includes ten discharge ports 20a to 20j arranged in the vertical direction.

The dry density separation apparatus 10 of the present embodiment can be used in either a batch method or a continuous method, but the operation will be described below using a case of separation by the batch method as an example.
First, a granular material as an object to be processed is introduced into the fluid tank 14 from the granular material inlet 18 and air is supplied from the air inlet 17 to the air chamber 13. The supplied air travels from the air chamber 13 through the dispersion plate 12 to the inside of the fluid tank 14 and fluidizes the granular material 21 existing in the fluid tank 14. In this state, by further vibrating the fluid tank 14 using the vibrator 15, the density segregation of the granular material 21 in the fluid tank 14 is promoted.

  When vibration is continued for a certain period of time in a state in which the powder 21 is fluidized, the powder having a relatively low density moves to the upper part of the fluid tank 14 and the powder having a relatively high density due to the density segregation phenomenon. Moves down. By discharging the granular material from the discharge port 20 in this state, the separated granular material fraction can be taken out from each of the discharge ports 20a to 20j. Therefore, the fraction discharged from the discharge port 20a contains the most dense powder and the fraction discharged from the discharge port 20j contains the most low-density powder. .

[Second Embodiment]
Next, the dry density separator 10 of the granular material in 2nd embodiment of this invention shown in FIG. 3 is demonstrated. In addition, the same number is attached | subjected to the member corresponding to 1st embodiment (FIG. 2).
The dry density separation device 10 of the second embodiment has a structure particularly suitable for continuous separation processing, and includes a device body 11 extending in a substantially horizontal direction. As in the first embodiment, the air chamber 13 and the fluid tank 14 are formed by dividing the inside of the apparatus main body 11 vertically by the dispersion plate 12. Further, on the side surface of the air chamber 13, a vibration exciter 15 combining a servo motor and an eccentric mass as vibration means is attached so as to vibrate the apparatus main body 11 in a substantially vertical direction. The elastic support member 16 having a coil spring is supported so as to be able to vibrate.

  Also in this embodiment, the powder inlet 18 and the fluidized air exhaust port 19 are provided in the upper part of the fluidized tank 14, but the outlet side dispersion is provided between the fluidized tank 14 and the fluidized air exhaust port 19. The point from which the board 22 is provided differs from 1st embodiment.

The granular material inlet 18 is provided at one end in the longitudinal direction of the fluid tank 14, and the outlet 20 is provided at the multi-end of the fluid tank 14. The discharge port 20 is divided by a partition plate 23 into a lower discharge port 20a and an upper discharge port 20b. The partition plate 23 is movable, and can adjust the distribution of the powder particles discharged from the discharge ports 20a and 20b by moving in the vertical direction. Furthermore, since the apparatus main body 11 promotes the movement of the granular material from the granular material inlet 18 (upstream) side to the outlet 20 (downstream) side, the outlet 20 side is lower than the granular material inlet 18 side. It is slightly inclined to be.

The operation in the case of performing separation in a continuous manner using the dry density separation device 10 of the second embodiment is as follows.
The granular material as the object to be processed is introduced into the fluid tank 14 from the granular material inlet 18 and fluidized by the air supplied from the air inlet 17. Further, by further vibrating the fluid tank 14 using the vibrator 15, the powder 21 in the fluid tank 14 moves from the powder inlet 18 side to the outlet 20 side and density segregates. The granular material 21 that has reached the outlet 20 side end of the fluidized tank 14 is divided into two by a partition plate 23, and the lower fraction containing a large amount of high-density powder is from the outlet 20 a to the density. The upper fraction containing a large amount of low-powder particles is discharged from the discharge port 20b.

  Furthermore, the component of the granular material discharged from one or both of the discharge ports 20a and 20b is measured online using a fluorescent X-ray (XRF) analyzer or the like, and the position of the partition plate 23 is determined based on the result. If the automatic adjustment is performed, the composition of the fraction discharged from each discharge port can be kept constant even if the component ratio of the granular material supplied in the continuous processing varies.

  Thus, according to the present invention, in addition to oscillating the entire fluidized tank to promote density segregation, from the plurality of outlets provided side by side on the wall surface of the fluidized tank, Since the particles separated by density are discharged in a separated state, even particles having a small density difference can be separated with high accuracy. In addition, since it is not necessary to suck and discharge the granular material, not only the cost and installation location for installing the equipment for suction collection are unnecessary, but also the granular material with a large particle size or the high density powder. It can also be used for separation of powders and particles that are difficult to be discharged by suction.

  Next, the present invention will be described more specifically based on examples. The following examples show preferred examples of the present invention, and the present invention is not limited to the examples.

[Evaluation of influence of vibration]
Example 1
In order to evaluate the effect of vibration in the present invention, the following experiment was conducted.
The refractory was separated using the apparatus described in the first embodiment (FIG. 2). As the refractory, an Al ₂ O ₃ rich work material used as a refractory for tundish and a SiO ₂ rich permanent material were mixed at a weight ratio of 1: 1. The composition and density of the work material and the permanent material are as shown in Table 1.

  The mixture of the workpiece material and the permanent material was pulverized to obtain a granular material having a particle size of 250 to 500 μm, and the granular material was accommodated in a fluidized tank of a dry density separator. Next, air was blown in from the air chamber to fluidize the granular material, and vibration was applied at a frequency (frequency) of 10 Hz to generate a density segregation phenomenon. After processing for 15 minutes, air blowing and vibration were stopped, and the granular material was taken out from the discharge port provided on the side surface of the fluid tank. The powder particles were taken out through the discharge port at the corresponding position for each height in the fluid tank. Let the granular material taken out from each discharge port (20a-20j of FIG. 2) be the fractions aj, respectively. Thereafter, the bulk density was measured for each of the fractions a to j.

(Comparative Examples 1 and 2)
For comparison, the granular material was separated under the same conditions as in Example 1 except that no vibration was applied (Comparative Example 1). Further, in order to evaluate the influence of the position where the vibration is performed, instead of the vibration means (15 in FIG. 2) attached to the apparatus main body, it is not in contact with the wall surface of the fluid tank and is in contact with only the granular material. In the same manner as in Example 1 except that vibration was performed using the vibration means provided in the fluid tank (Comparative Example 2).

  4A to 4C are graphs showing the bulk densities of fractions a to j measured in Comparative Example 1, Comparative Example 2, and Example 1, respectively. Fraction a is taken out from the lowest outlet 20a, and fraction j is taken out from the uppermost outlet j. Therefore, if density segregation has occurred appropriately, the bulk density should increase continuously from fraction j to fraction a so that the bulk density of fraction a is the highest.

However, in Comparative Example 1 where no vibration was applied, as shown in FIG. 4A, although the bulk density of the lower fraction (a side) tends to be slightly higher, The variation in bulk density in the minute was extremely large, and density segregation that could be used for practical separation did not occur. This is considered to be because the density difference between the workpiece material and the permanent material contained in the granular material is as small as 0.2 g / cm ³ .

On the other hand, in Example 1 in which the entire fluid tank was vibrated, the bulk density changed almost continuously from fraction j to fraction a as shown in FIG. Further, the difference in bulk density between the fraction a and the fraction j is large, and it can be said that good separation has been achieved despite the fact that the density difference of the powder particles is as small as 0.2 g / cm ³ .

  In Comparative Example 2 in which the vibration was performed in the fluidized tank, the bulk density changed substantially continuously as shown in FIG. 4B, and density segregation occurred as compared with the case where the vibration was not performed. However, as compared with Example 1 (FIG. 4C) in which the entire fluidized tank was vibrated, it can be seen that it was not sufficiently separated. This is presumably because the vibration device was installed in the fluidized tank, so that the vibration was transmitted only to the powder around the vibration device, and the vibration effect could not be sufficiently exerted on the entire granular material.

When the content of Al ₂ O ₃ in the granular material of fraction a obtained in Example 1 and Comparative Example 2 was measured by glass bead X-ray fluorescence analysis, in Example 1, it was 50.15% by mass. In contrast, in Comparative Example 2, it was 39.47% by mass. Also from this, it can be seen that by separating the entire fluid tank, it is possible to improve the separation accuracy of a granular material having a small density difference such as a workpiece material and a permanent material.

[Evaluation of influence of vibration frequency]
(Example 2)
Next, in order to evaluate the influence of the vibration frequency, the following experiment was performed.
Separation of the refractory used in the blast furnace for flowing hot metal discharged from the blast furnace was performed in the same manner as in Example 1. Said refractory, and weight of the silicon carbide is a major component density 2.4~2.5g / cm ^3, the weight of the alumina is a major component density 3.0~3.2g / cm ³ is It was contained, and this was pulverized and adjusted to a particle size of 250 to 500 μm, and then supplied to a fluidized tank for separation. The vibration frequency was 10 Hz.

(Example 3)
The granular material was separated under the same conditions as in Example 2 except that the vibration frequency was 5 Hz, which is the natural frequency of the fluidized tank. The natural frequency of the fluidized tank was measured by frequency analysis of the ratio between the impulse force of the impulse hammer and the acceleration of the free damped vibration, and reading the frequency indicating the peak value.

(Comparative Example 3)
The granular material was separated under the same conditions as in Example 2 except that no vibration was performed.

  FIGS. 5A to 5C are graphs showing the bulk density of fractions a to j measured in Comparative Example 3, Example 2, and Example 3, respectively. In Example 2 where the vibration was performed at 10 Hz, as shown in FIG. 5B, the separation accuracy was significantly improved as compared with Comparative Example 3 where the vibration was not performed (FIG. 5A). It was. And in Example 3 which vibrated with 5Hz which is the natural frequency of a fluid tank, as shown in FIG.5 (C), fractions a and b are further further than the case of Example 2 (10Hz). The bulk density increased. Thus, by performing vibration at the natural frequency of the fluidized tank, density segregation can be further promoted and high separation accuracy can be obtained.

In addition, in the said Example, the tundish refractory and the blast furnace refractory were used as separation object, However, The application object of this invention is not restricted to this. The dry density separation apparatus and dry density separation method of the present invention uses the difference in density of powder particles, so there is no restriction on the material of the powder material that can be applied, and it can be applied to the separation of powder materials of any material. Is possible. Examples of other separation objects include refractory bricks of blast furnace pans (heavy material density: 2.6 to 3.1 g / cm ³ , light material density: 2.1 to 2.4 g / cm ³ , density difference: 0.2 to 1.0 g / cm ³ ), mixture of slag and iron (weight density: 7.8 g / cm ³ , light weight density 2.5 to 2.7 g / cm ³ , density difference: 5.1 to 5.3 g / cm ³ ).

DESCRIPTION OF SYMBOLS 1 Tundish 2 Nozzle 3 Iron skin 4 Lining 5 Work material 6 Perm material 10 Dry-type density separation apparatus 11 Main body 12 Dispersion plate 13 Air chamber 14 Fluid tank 15 Exciter 16 Elastic support member 17 Air supply port 18 Powder and granular material injection Port 19 Fluidized air exhaust port 20 Discharge ports 20a to 20j Discharge port 21 Powder body 22 Exhaust port side dispersion plate 23 Partition plate (partition member)

Claims (4)

A dry density separation apparatus for powder,
An apparatus body including a fluid tank and an air chamber communicated with each other via a dispersion plate;
A granular material inlet for charging the granular material into the fluidized tank;
Fluidized air supply means for supplying fluidized air for fluidizing the granular material from the dispersion plate into the fluidized tank via the air chamber;
A fluidizing air outlet for exhausting the fluidizing air from the fluidizing tank;
Vibration means for vibrating the whole fluid tank;
Wherein for discharging a state where the density separated granular material in a fluidized tank are separated, a plurality of discharge ports that are arranged in the wall of the fluidization vessel, have a capital,
An apparatus for dry density separation of granular material, wherein an exhaust port-side dispersion plate is provided between the fluidized bed and the fluidized air exhaust port .   The dry density separation apparatus for a granular material according to claim 1, wherein at least one pair of adjacent discharge ports among the plurality of discharge ports is partitioned by a movable partition member.   The dry density separation apparatus for powder particles according to claim 1 or 2, wherein the vibration frequency of the vibration means is a natural frequency of the fluid tank.   Using the dry density separation apparatus for powder according to any one of claims 1 to 3, the powder is separated while vibrating the entire fluid tank by the vibration means. Density separation method.

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