JPH07102308A - Atomization method and device therefor - Google Patents

Abstract

PURPOSE:To continuously power a melt and to powder even a blast-furnace slag without clogging the nozzle of an atomizer. CONSTITUTION:A rail 5 is horizontally-arranged by the melt injection port 3 of a water atomizer provided with a water atomizer nozzle 1 and a high-frequency induction furnace 9 is freely tiltably placed on a truck 7 self-traveling on the rail 5. The furnace 9 is tilted around a first center consisting of a shaft 27 and a receiving member 29 and around a second center consisting of a hooked member 31 and a strut 33 by the large-diameter gear 15, small-diameter gear 19, roller 21 and guide bar 23 as the tilting mechanism 11. When the furnace is tilted, the truck 7 is moved back and forth so that the injection point of melt is fixed. Since the melt is allowed to overflow an overflow port 51 and injected, the nozzle is never clogged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal atomizing method and an atomizing apparatus suitable for producing metal / alloy powders used for powder metallurgy and for treating slag generated in a blast furnace.

[0002]

2. Description of the Related Art Conventionally, metal and alloy powders for powder metallurgy are
It was manufactured by pulverizing the molten metal with an atomizer equipped with various types of molten metal spraying means such as water spraying, gas spraying, and centrifugal spraying. This atomizer uses a structure in which molten metal or alloy melted in an induction furnace is poured into a tundish placed at the top of the atomizer, and is poured into the atomizer from the pouring nozzle at the bottom of the tundish. It was

Further, in recent years, as one method for treating slag generated in a blast furnace, slag pulverization using an atomizing device has been studied.

[0004]

However, the tundish pouring nozzle has a small pouring hole,
In the melt, in particular, fixed here impurities such as Al ₂ O _3, to cause nozzle clogging, can not be processed continuously melt. Further, the tundish in which the nozzle is clogged cannot be used as it is and must be replaced or repaired, which causes a problem of increased equipment cost. In particular, it has been extremely difficult to powderize the blast furnace slag that contains a large amount of impurities that cause such nozzle clogging.

Therefore, an object of the present invention is to provide an atomizing method and an atomizing apparatus capable of solving such a problem caused by nozzle clogging and capable of pulverizing blast furnace slag.

[0006]

According to the atomizing method of the present invention, which has been made to achieve the above object, as described in claim 1, the container containing the molten metal is tilted so that the molten metal overflows. , Directly pouring the molten metal to the molten metal spraying means arranged in the atomizing device,
An atomizing method for pulverizing, characterized in that while changing the horizontal relative distance between the container and the molten metal spraying means, the powder is pulverized while maintaining a relative pouring position relative to the molten metal spraying means. .

According to the atomizing method of the present invention, since the molten metal is poured from the upper part of the container by overflow, the nozzle clogging unlike the conventional atomizing method does not occur. Therefore, the molten metal can be continuously pulverized.
By the way, in the case of tilting the container to pour the molten metal, the dropping path of the molten metal differs depending on the inclination of the container, the amount of the molten metal, and the like.
However, in the method of the present invention, the pouring position relative to the molten metal spraying means is kept constant while changing the horizontal relative distance between the container and the molten metal spraying means. Therefore, it is possible to manufacture a powder having a uniform particle size.

In particular, as described in claim 2, claim 1
In the atomizing method according to claim 1, using a molten metal containing slag generated in a blast furnace as the molten metal, and if the slag is pulverized, a molten metal containing a large amount of impurities such as oxides is also continuous. It can be powderized.

Further, the atomizing device of the present invention, as described in claim 3, has a molten metal spraying means disposed inside,
An atomizing device comprising a container containing molten metal to be poured into the spraying means and a tilting means for tilting the container, wherein the container and the molten metal spraying means can be relatively moved in a horizontal direction. It is characterized by having a horizontal moving means.

According to this atomizing device, the horizontal movement means may be controlled as follows by manual control or automatic control. That is, when the molten metal overflowing from the tilted container flies to a distance, the container is retracted, and when the molten metal only drops to the front, the container is advanced, and the pouring position relative to the molten metal spraying means. Powdering may be performed while keeping the above constant. For example, when the tilting means is controlled so as to keep the tilt of the container constant, the horizontal moving means may be controlled so as to relatively advance the container with time. This makes it possible to pour the molten metal to a certain position in response to the fact that the molten metal that had flown far away at the beginning when the container was tilted gradually drops only toward the front as the remaining amount of molten metal decreases.

By the way, in order to perform such control, as described in claim 4, the horizontal moving means comprises a carriage on which the container is tiltably mounted and a rail on which the carriage travels. However, the tilting means may be placed on the trolley. The bogie can be moved forward and backward on the rail according to the control state of the tilting means, and pouring can be easily performed at a fixed position. However, the present invention is not limited to this, and it goes without saying that the spraying means may be moved horizontally.

On the other hand, as described in claim 5, claim 3
Or, in the atomizing apparatus according to 4, if the container is provided with a metal melting function, the molten metal can be maintained in an optimum molten state during the atomization,
Since the physical properties such as the viscosity of the molten metal can be kept constant from the beginning of pouring the molten metal to the end of the pouring, the effect of simplifying the control is high.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments will be described with reference to the drawings in order to further clarify the present invention. As shown in FIGS. 1 and 2, the atomizing device according to the embodiment has a water spray nozzle 1
Is a water atomizer provided with a rail 5 horizontally arranged beside the pouring port 3, a trolley 7 that is self-propelled on the rail 5, and is tiltably mounted on the trolley 7. A high frequency induction furnace 9 and a tilting mechanism 11 for tilting the high frequency induction furnace 9 are provided.

The tilting mechanism 11 is rotatably supported by a large-diameter gear 15 rotatably supported by a shaft 13 at predetermined lower positions on both sides of the bogie 7, and a shaft 17 parallel to the shaft 13 of the large-diameter gear 15. A small-diameter gear 19 that meshes with the large-diameter gear 15 to rotate, and a guide bar 23 that projects from the shaft 17 of the small-diameter gear 19 and is fitted onto a roller 21 provided at the lower rear portion of the high-frequency induction furnace 9 to serve as a guide. With. The large-diameter gear 15 has its shaft 1
It is rotated by driving the sprocket 25 attached to the No. 3 chain.

Further, the tilting mechanism 11 is engaged with a receiving member 29 for receiving the shaft 27 provided in the middle of the front part of the high-frequency induction furnace 9 and a recess of a key-shaped member 31 provided in the front part of the upper end of the high-frequency induction furnace 9. And a support column 33 which is supported from below. Axis 2
7 and the receiving member 29 become the center of tilting of the high-frequency induction furnace 9 when the high-frequency induction furnace 9 is not tilted so much (FIG. 1) (hereinafter referred to as the first center). On the other hand, the key-shaped member 31 and the support column 33 become the center of tilting of the high-frequency induction furnace 9 when the high-frequency induction furnace 9 is tilted to a certain extent or more (FIG. 2) (hereinafter referred to as the second center).

In this tilting mechanism 11, the small diameter gear 19 is rotated counterclockwise in the drawing by rotating the large diameter gear 15 in the clockwise direction in the drawing, and the guide bar 23 is flipped up so that the roller 21 moves in the guide bar 23. The high frequency induction furnace 9 is tilted while sliding. Note that pouring is not performed when the high frequency induction furnace 9 is tilting around the first center.
Then, the pouring is performed after starting to tilt around the second center.

High frequency induction furnace 9, tilting mechanism 11 and carriage 7.
Is, as shown in the block diagram of the drive / control system in FIG.
It is driven and controlled by a high-frequency oscillation circuit 41, a tilt motor 43, and a traveling motor 45 which are connected to the control device 40. The tilting motor 43 and the traveling motor 45 are both mounted on or built in the carriage 7.

In addition, reference numeral 47 in FIGS. 1 and 2 denotes a retractable shield. In this control, as shown in the flowchart of FIG. 4, first, the tilting motor 43 and the traveling motor 45 are set to the initial control state (S1).
0), while moving the carriage 7 to the tip of the rail 5,
The high frequency induction furnace 9 is placed upright. Next, the metal / alloy material to be pulverized is charged into the high frequency induction furnace 9 by atomization, and the high frequency oscillation circuit 41 is operated to perform melting (S20). When the predetermined melting state is reached, the tilt motor 4
3 is driven to slowly rotate the large diameter gear 15 clockwise at a constant speed to start tilt control (S30). Then, when the vehicle is tilted to the pourable state (S40), the traveling motor 45 is also energized, and the horizontal position control of the carriage 7 is executed (S50).

This horizontal position control is performed as shown in FIG.
When the molten metal overflowing from the overflow port 51 formed with a U-groove at the upper end of the high-frequency induction furnace 9 flies away, the truck 7 is retracted, and conversely, when the molten metal falls only toward the front, the truck 7 is moved forward. Run as you would. For example, a time chart as shown in FIG. 6 may be programmed. In this program example, first, the carriage 7 that has been moved forward to the front end of the rail 5 is slowly retracted at the start of pouring, and when it is retracted to a certain position, it is kept near that position until the pouring of a predetermined amount is completed. The trolley is controlled, and the trolley 7 is moved to the forward position again just before the pouring is completed. This is because there is no momentum in the molten metal at the beginning of pouring, it tends to fall to the feet, and when it leans to a certain extent, the molten metal starts to fly relatively far with a certain amount of momentum, and further pouring progresses and it is just before the end. This is because the remaining amount of the molten metal is small, and the overflow port 51 is oriented closer to the position directly below, so that the molten metal is likely to fall back to the feet again.

As described above, in this embodiment, since the molten metal is overflowed from the overflow port 51 at the upper end of the high frequency induction furnace 9 to be poured into the atomizing device, the molten metal contains impurities such as Al ₂ O _3. However, the problem of nozzle clogging of the tundish unlike in the conventional atomizing device does not occur. Therefore, a large amount of molten metal can be continuously atomized. Further, particularly, the hot metal containing a large amount of slag of the blast furnace is taken out to remove the high frequency induction furnace 9
If the slag is placed in a container and treated as described above, the nozzle is not clogged, and the slag is easily powdered. The powdered slag can be used as a shot material or the like.

Although the embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to these embodiments and can be realized in various modes without departing from the scope of the invention. Absent. For example, as the tilting mechanism 11, instead of using a motor or a gear, a hydraulic cylinder or the like may be used. Further, although the molten metal container is moved forward and backward in the embodiment, the water spray nozzle may be horizontally moved to perform the same horizontal position control as described above so that the water spray nozzle can be moved horizontally. Absent. Further, the present invention is not limited to water atomization, and may be applied to an apparatus for powderizing by gas atomization, centrifugal atomization, or the like. In horizontal movement, the operator may manually control the movement of the carriage while checking the pouring point.

[0022]

As described above, according to the atomizing method and the atomizing apparatus of the present invention, the molten metal can be continuously powdered without causing the nozzle clogging as in the conventional methods and apparatuses. . Particularly, according to the atomizing method of the second aspect, the blast furnace slag can be powdered and treated. Further, according to the atomizing apparatus of claim 5, since the container has a metal melting function, it is suitable for slowly processing a large amount of molten metal, and tilts with high accuracy.
Horizontal movement control is possible.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an apparatus according to an embodiment.

FIG. 2 is a schematic configuration diagram of an apparatus according to an embodiment.

FIG. 3 is a control system diagram of the apparatus of the embodiment.

FIG. 4 is a flowchart of a control process in the embodiment.

FIG. 5 is an explanatory diagram showing a basic idea of tilting / horizontal movement control in the embodiment.

FIG. 6 is a time chart of a control example of tilting / horizontal movement control in the embodiment.

[Explanation of symbols]

1 ... Water spray nozzle, 3 ... Pouring port, 5 ... Rail, 7 ... Truck, 9 ... High frequency induction furnace, 11 ...
Tilt mechanism, 15 ... Large diameter gear, 19 ... Small diameter gear,
21 ... roller, 23 ... guide bar, 40 ...
Control device, 41 ... High-frequency oscillation circuit, 43 ... Tilt motor, 45 ... Travel motor, 51 ... Overflow port.

Claims (5)

[Claims] 1. An atomizing method for injecting the molten metal directly into a molten metal spraying means arranged in an atomizing device by tilting a container containing the molten metal to cause the molten metal to overflow into a powder. An atomizing method is characterized in that the powder is pulverized while changing the horizontal relative distance between the container and the molten metal spraying means while keeping the pouring position relative to the molten metal spraying means constant. 2. The atomizing method according to claim 1, wherein a molten metal containing slag generated in a blast furnace is used as the molten metal, and the slag is pulverized. 3. An atomizing apparatus comprising: a molten metal spraying means disposed inside; a container containing a molten metal to be poured into the spraying means; and a tilting means for tilting the container. An atomizing device comprising a horizontal moving means capable of relatively moving a container and a molten metal spraying means in a horizontal direction. 4. The atomizing device according to claim 3, wherein the horizontal moving means comprises a cart on which the container is tiltably mounted and a rail on which the cart travels, and the tilting means is the cart. An atomizing device characterized by being placed on top of. 5. The atomizing device according to claim 3 or 4, wherein the container has a metal melting function.