JPH0796460B2 - Method and apparatus for producing slag - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a manufacturing method and apparatus for cooling a molten slag produced by metal refining into 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. 5, a molten slag 1a flowing down from a gutter 3 is caused to fly into the air 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 always good, and the slag has a large amount of expansion and cracks, and the slag has a high water content, which causes many problems in the post-process.

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. 58-17136 discloses a technique in which a molten slag is caused to fly by a rotating drum in a horizontally inclined cylindrical rotary hood, and the flying molten slag is cooled and granulated in the rotary hood. Japanese Patent Laid-Open No. 53-19
Japanese Patent No. 991 discloses a technique in which the flying molten slag is cooled in a water mist atmosphere and granulated.

However, in the technique described in this publication, a 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 obtain a uniform water mist atmosphere by only water injection. If the water mist atmosphere is not uniform, it is not possible to obtain a uniform slag.

Also, cooling in a water mist atmosphere does not cause the above-mentioned explosion, but the cooling effect is lower than when it is put into a water tank, so when the molten slag removed from the rotary hood is continuously conveyed by a conveyor, etc. There is a problem that the conveyor is easily damaged by heat.

Under the above circumstances, an object of the present invention is to enhance the cooling effect of the flying molten slag without causing an explosion.

[Means for Solving the Problems]

In order to solve the above problems, in the manufacturing method according to the present invention, a molten slag generated by metal refining is continuously flown from an upper opening thereof into a horizontally inclined cylindrical rotary hood in a water mist atmosphere. In addition to granulating and dispersing, air is vented from the upper opening toward the lower opening, and the flying molten slag is cooled by contact with the aeration and water mist in the rotary hood, and the lower part of the grain in the rotary hood. It is configured to drop into a water pool formed at the bottom near the slag discharge port and rapidly cool to obtain a slag.

Further, in the manufacturing apparatus according to the present invention, a water spray nozzle is provided in a horizontally inclined cylindrical rotary hood in which molten slag generated by metal refining is continuously jetted from the upper opening and granulated and dispersed. No, a water mist atmosphere is created by the water spray, and air is downwardly ventilated from the upper opening in the rotary hood, and a storage plate is provided all around the lower part of the rotary hood, near the lower slag discharge port. The water reservoir is formed by this reservoir plate.

The reservoir plate may be formed by a longitudinal spiral plate provided on the inner peripheral surface of the rotary hood, and the spiral reservoir plate may be formed by spirally disposing plate pieces at intervals.

[Action]

The present invention configured as described above, by the ventilation and water mist atmosphere in the rotary hood, while efficiently cooling the dregs, by rotating the rotary hood,
The slag that has flowed down to the inner surface of the hood moves along the slope while being cooled to promote cooling and prevent fusion, and eventually reaches a water pool and is rapidly cooled. This quenching is usually performed after the temperature of the slag has dropped to a point where it does not cause an explosion or change in properties, so there is no fear of such an explosion.

Further, 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 solidified in the uniform water mist atmosphere.

When the pool plate for the water pool is a spiral plate, the plate acts to convey the slag, and the cooling slag can be smoothly moved to the lower part of the rotary hood.

[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 side by side, and in front of them, a horizontal cylindrical rotary hood 11 is provided as a guide roller. When the molten slag 1a flows down from the pan C to the rotary drum 10a through the hopper d and the gutter 3, it is rotatably provided via the slag 12 and, as shown in the drawing, is melted by both rotary drums 10a and 10b. 1a flies forward and is granulated and dispersed,
Jump into the rotary hood 11. Rotating drums 10a, 10b
It is preferable that the rotary hood 11 is inserted into the rotary hood 11 as much as possible. This is because the molten slag 1a surely jumps into the hood 11.

A flight control plate 23 is provided above the rotary drums 10a and 10b, and the molten slag 1a from the rotary drum 10a is transferred to the flight control plate 2
It collides with 3 and is redirected to the rotary hood 11 side and indirectly jumps in. A water spray nozzle 24 faces the inner surface of the flight control plate 23 and is cooled by this water spray to prevent remelting even if the molten slag 1 collides. 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. Incidentally, the nozzle 24 may not be provided, and only the coating material or the graphite plate 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.

Inside the upper opening of the rotary hood 11 and the rotating drum
The water spray nozzles 13 are provided on both sides of the front of the 10b and the rotary hood 1
The necessary number is provided facing the inside of 1 and the water mist is jetted from this nozzle 13 so that the inside of the rotary hood 11 becomes a water mist atmosphere, and the flying molten slag from the rotating drums 10a and 10b.
1a comes into contact with this water mist and is cooled to form a slag 1.

The rotary hood 11 is inclined downward to the right, and is rotated at a required speed by a motor 22 via a chain 22 'and the like, and the rotation causes the slag 1 to be lifted and repeatedly dropped (up and down) to be cooled. While moving forward (to the right). Further, in the rotary hood 11, there is provided a spiral reservoir plate 26 from the middle of its length direction to the vicinity of a through hole 19 which will be described later, and the flying molten slag 1a retains this reservoir plate 26.
As it collides with and falls, the water mist drops and the storage plate
Due to the presence of 26, water pool a at the bottom of the rotary hood 11
Is formed, the molten slag 1a falls into the water pool a, is rapidly cooled, and is moved to the right by the screw action of the storage plate 26. The rapid cooling in the water pool a is not a problem because the molten slag 1a is cooled to such an extent that the property change and the explosion do not occur due to the water mist and ventilation.

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.

In addition, the inside of the rotary hood 11 is exhausted from the exhaust port 16 at the right end (rear end) of the exhaust fan B to generate a flow of air, and this flow (aeration) promotes cooling of the slag 1 and Diffusion of water mist is achieved, uniform water mist is formed in the entire area of the rotary hood 11, and cooling of the slag 1 is further promoted. A conical cover 17 on the exhaust vent 16
The cover 17 prevents the slag 1 from flowing out of the exhaust port 16.

An annular 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. The moving slag 1 flows into the collecting pipe 18, falls from the discharge port 20 onto the belt conveyor 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 the slag 1 is flown into the inside and dispersed into granules, the slag 1 is cooled by contact with water mist and aeration, collides with the reservoir plate 26 and drops, and is cooled in a water reservoir a at the inner bottom of the rotary hood 11. While repeatedly moving up and down 26
It moves to the right through the and is discharged from the discharge port 20.

[Embodiment 2] In the embodiment shown in FIGS. 3 and 4, the water spray nozzles 13 are provided on the central axis and the inner surface of the rotary hood 11 at a required interval, 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-mentioned embodiments in that it has a screw plate 26 forming a part of the reservoir plate, a screw plate 26 'for returning the slag, a collision plate 27 and an outer hood 28. Screw plate 26,
26 'is provided in the middle and right end of the rotary hood 11,
As shown in the figure, the plate pieces 26a, 26a 'are provided in a spiral shape at a required interval, and the screw plate 26 is a slag 1
While stirring, move it to the right, and the screw plate 26 ′ at the right end becomes a spiral opposite to 26 and the through hole 19 for discharging the slag
The slag 1 that has passed through is returned 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 reservoir auxiliary plate 30 is provided at the right end of the bracket 29, and a water pool a is formed by this plate 30 and the screw plate 26, and in this water pool a, the slag 1 is cooled more reliably. . Granule 1 is a rotary hood 11
By rotating, the board 30 gets over as shown by the arrow and the through hole
Up to 19.

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 a discharge port 16 and a discharge 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 hole 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.

The flying of the molten slag may be performed by means other than the rotating drums 10a and 10b.

〔The invention's effect〕

According to the present invention, as is clear from the above description, since the molten slag is cooled by the water mist and then rapidly cooled in the water pool, no explosion occurs and the property of the slag is changed. It is possible to efficiently obtain the slag with a high yield.

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

In this way, the temperature of the particle slag is lowered to such an extent that it does not hinder the transportation due to the uniform water mist atmosphere in the rotary hood and the rapid cooling by the water pool, so the particle slag discharged from the rotary hood is safe. Therefore, safe operation is possible, and there is little risk that the conveyor for conveying slag and the like will be damaged by heat, and the slag can be continuously moved and productivity is improved.

[Brief description of drawings]

1 and 3 are cut-away front views of respective embodiments according to the present invention, FIG. 2 is a cut-away right side view of FIG. 1, FIG. 4 is a cut-away left side view of FIG. 3, and FIG. [Fig. 4] is a schematic view 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, 26 ... Retaining plate (screw plate), 30 ... Reserving auxiliary plate, a ... Water pool.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Nakano 2-35, Jinmucho, Yao City, Osaka Prefecture Kubota Iron Works Co., Ltd., Kuhoji Plant (72) Inventor Kiyokazu Sasaki 1-31 Makiyama, Tobata-ku, Kitakyushu, Fukuoka No. Hamada Heavy Industries Co., Ltd. (72) Inventor Matsutaro Kajitani 1-36 Makiyama, Tobata-ku, Kitakyushu, Fukuoka Prefecture In-house Hamada Heavy Industries Co., Ltd. (72) 1-31 Makiyama, Tobata-ku, Kitakyushu, Fukuoka Prefecture No. Hamada Heavy Industry Co., Ltd. (72) Inventor Jun Oishi 1-1-36 Makiyama, Tobata-ku, Kitakyushu City, Fukuoka Prefecture Within Hamada Heavy Industry Co., Ltd.

Claims (4)

[Claims] 1. A molten slag 1a produced by metal refining is continuously jetted from an upper opening thereof into a cylindrical rotary hood 11 having a sideways inclination in a water mist atmosphere to be granulated and dispersed, and from the upper opening. Aeration is made toward the lower opening, and the flying molten slag 1a is cooled by contact with the aeration and water mist in the rotary hood 11, and is formed in the bottom of the rotary hood 11 near the lower particle slag discharge port 19. A method for producing a slag, characterized in that the slag is obtained by dropping it into the water pool a and rapidly cooling it. 2. A water spray nozzle 13 is faced in a horizontally inclined cylindrical rotary hood 11 in which a molten slag 1a produced by metal refining is continuously flown from an upper opening and granulated and dispersed. Along with the water mist atmosphere by aeration, the rotary hood 11 is vented downward from its upper opening, near the lower part of the rotary hood 11 near the bottom slag discharge port 19, a reservoir plate 26 is provided all around, An apparatus for producing a slag, characterized in that a water pool a is formed by the storage plate 26. 3. The granule according to claim (2), characterized in that the reservoir plate (26) is a longitudinal spiral plate provided on the inner peripheral surface of the rotary hood (11). Manufacturing equipment. 4. The apparatus for producing a slag according to claim (3), characterized in that the spiral storage plate (26) is formed by spirally forming plate pieces (26a) at intervals.