JPH05269401A - Iron removing machine for powder - Google Patents

Abstract

PURPOSE:To remove precisely an iron ingredient contained in magnesia powder. CONSTITUTION:Air from an air dispersion equipment 7 is blown into powder charged in an iron removing vessel 2 to form a fluidized bed 6 of the powder. Magnets 3 are placed in the fluidized bed 6 to collect iron for removal. The powder is separated from the air flow with a dust collector 12 for recovery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron removing machine for removing iron such as metallic iron powder mixed in powder from powder such as magnesium oxide.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram of a conventionally known iron removing machine 40. The powder is dropped in the guide 42 in the direction of arrow 41. Magnets 44 and 45 are arranged on both sides of the guide 42. The guide side of the magnet 44 is the N pole, and the guide side of the magnet 45 is the S pole. The iron mesh 46 captures metallic iron or the like in the powder which is magnetized by the magnetic flux of the magnets 44 and 45 and passes through the mesh 46 by magnetic force. The iron-free powder is in Guide 4
It falls through 2 in the direction of arrow 43.

[0003]

In the iron removal machine 40, iron removal may be incomplete depending on the characteristics of the powder such as the type of powder and the grain size composition. In addition, the powder may not flow smoothly in the guide 42, or the mesh 46 may be clogged with the powder. Further, when the powder naturally falls on the mesh 46, the iron content contained in the powder is not completely captured by the excited mesh 46 but falls while being mixed in the product.

It is an object of the present invention to provide a powder iron removing machine having good separation performance without causing clogging.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a suspended matter forming portion for forming a floating phase of powder, an iron depositor arranged in the floating phase, and a separator for separating the powder from an air stream. It is a powder iron removing machine characterized by being processed. In this case, if the floating phase of the powder is the fluid phase of the powder, iron can be removed more efficiently, and it is very suitable if the iron depositor is a magnetic fluid medium.

[0006]

[Operation] The powder is suspended in an air stream to form a floating phase of the powder, and a magnet or electromagnet is placed in the floating phase as an iron depositor to remove the iron in the powder by adhering it to the magnet or electromagnet. , Separate the powder from the air stream. Such an iron removing machine does not cause clogging and can efficiently remove the adhered iron component. If the floating phase of the powder is a fluidized bed of the powder, iron removal of the powder can be efficiently achieved. If a magnetic fluidized medium is placed in the fluidized bed of the powder, iron removal of the powder can be efficiently achieved simultaneously with the flow of the powder.

[0007]

[Example] When firing a green chip of a capacitor in an electric furnace, it is placed on a magnesia setter and fired. The magnesia setter is manufactured from magnesium oxide (hereinafter, magnesia) powder. Since magnesia is crushed by a ball mill into powder, it is unavoidable that a trace amount of iron is mixed. In the firing step, if iron is contained in the starting raw material magnesia powder, the iron content permeates into the capacitor and impairs the quality of the capacitor. Therefore, iron in the magnesia powder needs to be removed, and a high-performance iron removing machine is required.

FIG. 1 shows an embodiment of the present invention and is a block diagram of a powder iron removing machine 1. The iron 3 is removed from the magnet 3 by the hanging tool 5.
Provide inside. The magnesia powder is put into the iron removing cup 2 in the direction of the arrow 17 from the duct 4 for feeding the magnesia powder. When entering, the valve 19 is opened, and after entering, the valve 19 is closed. An air dispersion device 7 in the iron removing bowl 2 and an air chamber 8 in the lowermost portion of the iron removing bowl 2
To provide. Air is blown into the air chamber 8 from the blower 9 through the conduit. The air passes through a dispersing device 7 to form a fluidized bed 6 of powder in the iron removal slag 2.

The magnet 3 is suspended in the iron removal slag 2 by a suspending tool 5. The magnet 3 is installed so as to be located in the fluidized bed 6.
The iron component mixed in the powder adheres to the magnet 3. Fluidized bed 6
The powder that has left the box is sent to the dust collector 12 through the outlet pipe 10 of the iron removal slag 2. The dust collector 12 includes a filter bag (not shown). The powder shown by the arrow 18 is collected through the hopper 15 and the chute 16. The air is exhausted by the blower 14 through the exhaust pipe 13. Tube 10
A magnetized mesh 11 made of iron may be provided inside. This brings the iron removal closer to full.

The material of the iron removing cup 2 may be iron. If it is a non-ferrous material, iron will not be mixed into the powder. The magnet 3 may be an electromagnet. In this way, powder iron removal is performed.
The above operation is a batch method. In FIG. 1, if a screw conveyor or the like for forcibly feeding the powder is installed in the iron removing bowl, continuous operation is possible. After the iron removal operation is completed, the magnet
The iron adhering to the outside of the iron removing cup is separated by a hydraulic jet or the like. Alternatively, the excitation can be released by mechanically shorting the positive and negative magnetic poles. An electromagnet can easily separate iron if it cuts off electricity.

In the apparatus shown in FIG. 1, the iron removing tank 2 has a diameter of 1000 mmφ, a total height of 1500 mm, and a fluid phase forming portion height of 1000 mm. Magnetization area of magnet 3 is 150m
m × 300 mm, magnetic force is 10,000 gauss. 100 kg of magnesia powder with a particle size of 1 mm or less when the air volume is 1 m ³ / min and the pressure is 600 mmAq.
/ H can be processed.

An iron removing machine according to an embodiment of the present invention shown in FIG. 1 and FIG.
Table 1 shows the results obtained by feeding the magnesia powder shown in Table 2 to the conventional iron removing machine shown in FIG. Magnesia shows values for pulverized powders A and B. Table 1 shows an example of the chemical analysis results of magnesia powder. Table 2 is an example of the particle size distribution of magnesia powder.

[0013]

[Table 1]

[0014]

[Table 2]

In the conventional iron removing machine shown in FIG. 4, 0.12% iron content in terms of Fe ₂ O ₃ was contained in the magnesia powder before treatment, and 0.11% iron content remained in the comparative example. The powder treated with the iron removing machine of the example was surely iron-removed to an iron content of 0.06% or less. Moreover, since there is no clogging, the work is easy. FIG. 2 shows another embodiment and is a block diagram of a powder iron removing machine. The difference from FIG. 1 is that the magnet 3 is installed by a suspending tool 21 in the floating layer of the powder separated from the fluidized bed. The efficiency of iron removal was better when the installation density of magnets was relatively higher than in FIG. Fluidized bed 6
Is the same as that shown in FIG.

FIG. 3 is a block diagram of a powder iron removing machine according to still another embodiment. The iron removing cup 2 was made of plastic. A magnetic fluidized medium 20 was placed in the iron removing cup 2. This fluid medium is obtained by magnetizing an iron hollow cylinder having a diameter of 5 mm, a height of 5 mm and a wall thickness of 0.2 mm. This is a fluid medium and at the same time acts as a magnet. The procedure is the same as that of FIG. 1 except that the fluidized bed 6 of powder is formed.

[0017]

According to the iron removing machine of the present invention, it becomes possible to completely separate and remove iron mixed in the magnesia powder.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a powder iron removing machine according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a powder iron removing machine showing an embodiment of the present invention.

FIG. 3 is a configuration diagram of a powder iron removing machine according to an embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventionally known iron removing machine.

[Explanation of symbols]

 1 iron removing machine 2 iron removing mill 3 magnet 4 magnesia powder feeding pipe 5 hanging equipment 6 fluidized bed 7 dispersing device 8 air chamber 9 blower 10 outlet pipe 12 dust collector 13 exhaust pipe 14 blower 15 hopper 16 chute 19 valve 20 Fluid medium

Claims (3)

[Claims] 1. A powder removing unit comprising: a floating material forming unit for forming a floating phase of powder; an iron depositor disposed in the floating phase; and a separator for separating the powder from an air stream. Iron machine. 2. The iron removing machine for powder according to claim 1, wherein the floating phase of the powder is a fluidized phase of the powder. 3. The iron removing machine for powder according to claim 2, wherein the iron depositing device is a magnetic fluidized medium.