JPH0796459B2 - Manufacturing method of slag - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for cooling a molten slag produced by metal refining to obtain a granular slag.

[Conventional technology and its problems]

The molten slag produced by metal refining is made into a granular slag shape for effective use. As a method for producing this slag, it is general to fly the molten slag into the air to granulate and disperse the slag to obtain a slag. However, the slag that has been granulated and dispersed is still at a high temperature in the state where it is deposited on the ground and is often in a semi-molten state, and although it once became a slag, the particles are fused again. The re-fusion phenomenon easily occurs. Therefore, there is a problem that the recovery yield is reduced, and it is necessary to take some measures to prevent re-fusion.

Therefore, various means have heretofore been devised, and the most general method for preventing re-fusion is disclosed in, for example, Japanese Patent Application Laid-Open No. 48-5780.
As described in Japanese Patent Publication No. 2 and shown in FIG. 6, a molten slag 1a flowing down from a gutter 3 is caused to fly hollow by a rotating drum 4, and the flying slag 1 is put into a water tank 2 to be rapidly cooled. Is.

However, in this method, since the grain slag 1 is cooled rapidly in the water tank having an absolutely large heat capacity, re-fusion of the grain slag 1 is surely prevented, but on the other hand, there is a risk of explosion, and the rapid cooling causes The quality of the generated slag is not necessarily high quality, it becomes a slag with many expansions and cracks, and the slag has a high water content, which makes recovery work complicated for subsequent processes. I have a problem.

Further, as another method, as described in JP-A-53-66934, a belt conveyor is installed in the entire falling range of flying particle slags, and the particle slags are dropped onto a moving bed composed of this belt conveyor. In some cases, the particles are cooled and recovered while reducing the mutual contact while moving the slag.

However, in this method, it is necessary to construct a moving bed in a wide range, the equipment itself becomes large, and there is a problem in terms of cost, and further, the particle dregs are further dropped and fused to the particle dregs on the belt conveyor. There is also a problem that a phenomenon occurs and the effect of preventing fusion is not sufficiently obtained.

Further, Japanese Patent Publication No. 56-24860 discloses a technique of causing a molten slag to fly in a laterally inclined cylindrical rotary hood, and cooling the flying molten slag by aeration in the rotary hood to granulate it. Japanese Unexamined Patent Publication No. 53-19991 discloses a technique in which the flying molten slag is cooled in a water mist atmosphere to be granulated.

However, in the technique described in this publication, since the rotary hood is not provided with any cooling means, the molten slag easily adheres, and this adhesion deteriorates the durability of the rotary hood and remelts the molten slag. Invite clothes. Further, the water mist atmosphere is created by water injection, but it is difficult to arrange the injection nozzle so as to have a uniform water mist atmosphere from the viewpoint of the structure such as rotation of the rotary hood. It is difficult to get a water mist atmosphere. If the water mist atmosphere is not uniform, it is not possible to obtain a uniform slag.

Under the above circumstances, an object of the present invention is to eliminate the adhesion of molten slag to the inner surface of the rotary hood.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, a molten slag produced by metal refining, in a horizontally inclined cylindrical rotary hood, continuously flying from its upper opening to be granulated and dispersed, By aeration in the rotary hood, the molten slag that has been granulated and dispersed is cooled to obtain a granular slag, and the rotary hood and an inner cylinder having the same axial center as the rotary hood provided on the inner surface of the upper opening side thereof. It adopts a structure that ventilates between.

In addition to the above configuration, water spray may be applied to the rotary hood.

[Action]

The method of manufacturing a granular slag according to the present invention configured as described above, the inside of the rotary hood is aerated, cooling of the granular slag is efficiently performed, and the rotation of the rotary hood causes the granular slag to flow down to the inner surface of the hood. The slag moves along the slope and is discharged from the lower part of the hood while flowing to promote cooling and prevent fusion.

At this time, since ventilation is provided between the rotary hood and the inner cylinder, the ventilation cools the inner cylinder and the inner surface of the rotary hood, and the molten slag abuts on the cooling surface. It is cooled rapidly by contact,
Adhesion to the inner cylinder and the inner surface of the rotary hood is minimized.

Also, if water is sprayed in the rotary hood,
The flying molten slag comes into contact with the water spray mist, and the cooling action of the molten slag is promoted. At this time, since the rotary hood is ventilated, the water spray mist is evenly distributed in the hood by this ventilation, and the molten slag is cooled and granulated in the uniform water mist atmosphere.

[Embodiment 1] As shown in FIG. 1, on a frame F, rotary drums 10a and 10b having radial blades 10 'on their outer peripheral surfaces are arranged in parallel, and in front of them, a horizontal cylindrical rotary hood 11 is provided as a guide roller. It is rotatably installed via 12 ',
The molten slag 1a is passed through the hopper d and the gutter 3 to the rotary drum 10a.
2 (see FIG. 2), the molten slag 1a is jetted forward by the rotating drums 10a and 10b as shown in FIG. It is preferable that the rotary drums 10a and 10b be inserted into the rotary hood 11 as much as possible. This is because the molten slag 1a surely jumps into the hood 11.

A fixed hood 12 is provided above the rotating drums 10a and 10b, and a flight control roller 13 'is provided in the hood 12 so that the position of the flight control roller 13' can be adjusted back and forth and up and down.
By the rotation of, the molten slag 1a from the rotary drum 10a is redirected to the rotary hood 11 side and indirectly jumps in. The roller 13 'is cooled by spraying water on the outer surface to prevent re-fusion even if the molten slag 1 collides.

A required number of water spray nozzles 13 are provided in the upper front part of the hood 12 so as to face the inside of the rotary hood 11, and the jet of water mist from the nozzle 13 creates a water mist atmosphere in the rotary hood 11, thereby causing the rotating drum 10a. The molten slag 1a from 10 and 10b is cooled by coming into contact with this water mist.
Becomes

The rotary hood 11 is inclined downward to the right and is rotated at a required speed by a motor 22 via a gear 22 ', and this rotation causes the slag 1 to be lifted and dropped (up and down) repeatedly while cooling. Moves forward (to the right) while being done. The moving action of the slag 1 also prevents the slag from being fused to the rotary hood 11.

The annular air pipe 14 is slidably contacted with the outer periphery of the left end of the rotary hood 11, and the sliding contact surface of the air pipe 14 is opened.
When blown from a blower (not shown), it is blown into the rotary hood 11 through the through holes 14a. It is also possible to blow air from the peripheral edge of the left end opening of the rotary hood 11 without providing the air tube 14. Further, on the inner surface of the rotary hood 11, inner cylinders 15 ... Are provided via a bracket 15 ′ from the left end to the right end.
The air of the air pipe 14 flows into the space 11 and is blown into the rotary hood 11 to accelerate the cooling of the slag 1 and cool the inner cylinders 15. Therefore, fusion of the molten slag 1a to the inner cylinder 15 ... And the rotary hood 11 is prevented as much as possible. Furthermore, the inside of the rotary hood 11 is exhausted from the exhaust port 16 at the right end (rear end) by the exhaust fan B (see FIG. 2) to generate a flow of air, and this flow (aeration) cools the slag 1. To be done. The air exhaust port 16 is provided with a conical cover 17, and the cover 17 blocks outflow of the slag 1 from the air exhaust port 16.

An annular particle slag collecting pipe 18 is slidably contacted with the outer periphery of the right end (rear end) of the rotary hood 11, and the slidable contact surface of this collecting pipe 18 is open, and through the through hole 19, the inside of the rotary hood 11 Slag 1
Flow into this collecting pipe 18 and from the outlet 20 to the belt conveyor.
It drops on 21 and is conveyed to the next process.

This embodiment is configured as described above, and the rotary drums 10a and 10b make the rotary hood 11 in which the molten slag 1a has a water mist atmosphere.
When it is flown into the inside and is granulated and dispersed, the granular slag 1 is cooled by the contact with the water mist and aerated, and falls, and at the inner bottom of the rotary hood 11, while moving up and down repeatedly, it moves to the right while being cooled, It is discharged from the discharge port 20.

In this operation, the residence time of the particle slag is determined by the inclination angle θ of the rotary hood 11 and the rotation speed t. For example, 0 <θ <5 degrees, 1 ≦ t ≦ 20 rpm, and preferably θ≈2 degrees. ,
Set t≈4 rpm. However, these θ and t may be appropriately determined by experiments and the like, and are not limited to the above values.

[Embodiment 2] The embodiment shown in FIGS. 2 and 3 is the same as the embodiment 1 except that the water spray nozzle 13 is attached to the rotary hood 11.
Not only above the front of the hood but also on both sides of the front of the rotating drum 10b, and remove the flight control roller 13 'to remove the hood.
12 is brought close to the rotating drums 10a and 10b to form a flight control plate 23,
The water spray nozzle 24 faces the flight control plate 23, and the rotary hood 11 is rotated by a chain. Although only the water spray nozzle 24 may be used, a heat-resistant coating material such as molybdenum disulfide or boron nitride may be applied to the inner surface of the flight control plate 23, or a graphite plate may be attached. Further, the nozzle 24 may not be provided and only this coating material may be used. In the figure, 25 is a plate for preventing the molten slag 1a from scattering, which is provided on both sides of the rotating drums 10a and 10b.

In this embodiment, the spray area of the water spray nozzle 13 is widened to make the water mist area in the rotary hood 11 uniform and stabilize the cooling action.

[Embodiment 3] In the embodiment shown in FIG. 4 and FIG. 5, the water spray nozzles 13 are provided on the central axis and the inner surface of the rotary hood 11 at required intervals, and the water mist in the hood 11 Homogenize.
The supply pipe of the nozzle 13 is connected to an external pipe via a rotary joint, and the nozzle 13 rotates together with the rotary hood 11.

Further, this embodiment is different from the above embodiment in the screw plate.
It has 26, 26 ', a collision plate 27 and an outer hood 28. The screw plates 26, 26 'are provided at the middle and right ends of the rotary hood 11, and as shown in the drawing, plate pieces 26a, 26a' are provided in a spiral shape at a required interval. The slag 1 is moved to the right while being stirred, and the screw plate 26 ′ at the right end becomes a spiral opposite to 26, and returns the slag 1 that has passed through the slag discharge through hole 19 to the through hole 19. The collision plate 27 is provided in the center via a scraping bracket 29, and the collision plate 27 prevents the particle slag 1 from flying rearward (right end). An annular storage plate at the right end of the bracket 29
30 is provided, and a water pool a is formed by this pool plate 30, and the slag 1 is cooled more reliably in this water pool a. In the cooling here, since the temperature of the slag 1 is lowered, there is no problem such as explosion as in the conventional pit water cooling system. In addition, the slag 1 passes through the reservoir plate 30 as shown by the arrow in the drawing by the rotation of the rotary hood 11, and the through hole 19 is formed.
Leading to.

The outer hood 28 is fixed to the outer periphery of the rotary hood 11 including the through hole 19 and is inclined leftward outward, and its left end is
It is slidably connected to an annular pipe 31 having an exhaust port 16 and an exhaust port 20. The annular pipe 31 is fixed to the frame F and is in sliding contact with the rotary hood 11. Therefore,
The slag 1 that has passed through the through holes 19 moves leftward while moving up and down within the outer hood 28, and is further sprayed by the water spray nozzle 32, cooled, and discharged.

In addition, in each of the embodiments, the molten slag 1a was flown by the rotating drum, but other means may be used.

〔The invention's effect〕

Since the present invention is configured as described above to cool the inner surface of the rotary hood and the inner surface of the inner cylinder, the adhesion of the molten slag to the inner surface of the rotary hood and the inner cylinder is minimized, and the durability of the rotary hood is reduced. In addition to increasing the property, re-fusion of the molten slag due to the adhesion is prevented.

Further, if water is sprayed into the rotary hood, the water mist is evenly distributed in the rotary hood by the aeration, the cooling action of the molten slag is promoted, and a smooth and uniform slag can be obtained.

[Brief description of drawings]

1, 2, and 4 are cut-away front views of respective embodiments according to the present invention, FIG. 3 is a cut-away right side view of FIG. 2, and FIG. 5 is a partially cut-away left side of FIG. A plan view and FIG. 6 are schematic views of a conventional example. 1 ... Grain slag, 1a ... Molten slag, 10a, 10b ... Rotating drum,
11 …… Rotary hood, 13 …… Water spray nozzle, 16 ……
Exhaust port, 14a, 19 ... through hole.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shiro Mineyuki 2-35, Jinmu-cho, Yao-shi, Osaka Kubota Iron Works Co., Ltd., Kuhoji Plant (72) Inventor Makoto Nakano 2-35, Shinbu-cho, Yao-shi, Osaka Kubota Ironworks Co., Ltd. in the Kuohoji Plant (72) Inventor Kiyokazu Sasaki 1-1-36 Makiyama, Tobata-ku, Kitakyushu, Fukuoka Hamada Heavy Industries Co., Ltd. (72) Inventor Matsutaro Kajiya 1-1-36 Makiyama, Tobata-ku, Fukuoka Issue Hamada Heavy Industry Co., Ltd. (72) Inventor Tsukasa Kusunoki 1-31 Makiyama, Tobata-ku, Kitakyushu, Fukuoka Prefecture In-house Hamada Heavy Industry Co., Ltd. (72) 1-31 Makiyama Tobata-ku, Kitakyushu, Fukuoka Prefecture Issue in Hamada Heavy Industries Co., Ltd. (56) References Japanese Patent Publication Sho 58-17136 (JP, B2) Japanese Patent Publication 61-57553 (JP, B2)

Claims (2)

[Claims] 1. A molten slag 1a produced by metal refining is continuously flown into a horizontally inclined cylindrical rotary hood 11 from its upper opening to be granulated and dispersed, and by aeration in the rotary hood 11, While cooling the granulated and dispersed molten slag to obtain a granular slag, the rotary hood
A method for producing a particle dregs, characterized in that air is passed between the rotary hood 11 provided on the inner surface of the upper opening portion side thereof and the inner cylinder 15 having the same axis center. 2. The method for producing a dross according to claim 1, wherein water is sprayed into the rotary hood 11.