JPS6082625A - Production of sintered ore - Google Patents

Abstract

PURPOSE:To prevent incomplete calcination of raw material layer and to improve the yield when a sintering machine is suspended temporarily and then started again by performing sintering by covering an empty pallet on which the material is not yet supplied with a flexible sheet. CONSTITUTION:Bed ore is charged from a bed hopper 2 to a pallet 1 and a material to be sintered is charged from a surge hopper 3 on the bed ore. The surface of the bed ore is ignited in an igniting furnace 4 and the atmosphere in the furnace is exhausted by a main fan 6 from a wind box 5 to prepare sintered ore which is discharged from a discharging end. When the pallet 7 is emptied for repair, etc. and is started again, the restart is commenced by covering the empty pallet 1 with a flexible sheet 8. As the pallet 1 is forwarded, the sheet 8 is wound by a sheet winder 9. By this method, the air supplied to the empty pallet 1 is shielded by the flexible sheet 8 but is passed through the layer of the raw material to prevent imcomplete calcination.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing sintered ore when a sintering machine is restarted after being temporarily stopped due to repair or failure.

In the DwyDroid sintering machine, sintered raw material is charged in a constant layer thickness onto a pallet that is driven in an end reflex, ignites the surface of the raw material layer, and at the same time sucks air through a wind box below the pallet to produce sintered ore. is common. In the production of such sintered ore, the sintered layer consists of a sintered ore zone, a molten zone, a wet zone, and a raw material zone from the top, and among these, the zone with the greatest ventilation resistance is the molten zone. Next is the wet zone, and the smallest zone is the sinter zone. In such a state of ventilation resistance, when the sintering machine stops emptying the pallet due to repairs or failure, when restarting, the damper of the wind box is fully closed and the tip of the charged raw material layer is The damper is opened after passing through each wind box, but there is a problem with the sealing performance of the damper, and the ventilation resistance is high due to the molten zone, wet zone, and raw material zone mentioned above. It has the disadvantage that it is difficult to ventilate, and raw firing results in a state that deteriorates the product yield.

The present invention has been made to deal with such drawbacks, and its gist is to supply and ignite the sintering raw material at the starting end on the endlessly driven pallet of the sintering machine, and to ignite the sintering raw material from the bottom of the pallet. A method for producing sintered ore that takes in more air is characterized in that when restarting the sintering machine after stopping, sintering is carried out while covering an empty pallet with a flexible sheet in a state where sintering raw materials are not supplied. It is something.

The present invention will be described in detail below based on the drawings. FIG. 1 is a diagram showing an example of an apparatus for implementing the present invention. (1) is a pallet, (2) is a bedding hopper, (3) is a surge hopper, (4) is an ignition furnace, (5) is a wind box, (6) is a
) is the main exhaust fan, and (7) is the opening/closing damper. In the sintering machine, bedding ore is charged from the bedding hopper (2) onto a pallet (1), the sintering raw material is charged from the surge hopper (3) onto the pallet, and the sintering material is placed on the surface of the pallet by the ignition furnace (4). The sintered ore is ignited and sucked in from the wind box (5) by the main exhaust fan (6) to produce sintered ore, which is discharged from the ore discharge end. In such a sintering machine, in the event of repair or breakdown, the charging of the surge hopper (3) and bedding hopper (2) will be stopped and the pallet (1)
will be stopped empty and repairs etc. will be carried out.

To restart operation after repairs, etc. are completed, use the bedding hopper (2).
and the empty pallet from the surge hopper (3) (
1), ignite it in the ignition furnace (4), and turn it on to the main exhaust fan (6).
) and restart the operation, but the present invention starts operation while covering the empty pallet (1) with the flexible sheet (8). As the pallet (1) advances, it is wound up by a sheet winder (9) while advancing.

FIG. 2 is a diagram showing details of the winding machine, with (a) being a side view and (b) being a plan view. The winder (9) is a pallet (1
) are installed on both sides of the winding shaft θ■ so that they can run freely on the traveling rail α0 (2) and the traveling drive device @.
The flexible sheet (8) is wound up.

α→ is a winding drive device, and it is preferable to make the speed variable so as to synchronize with the moving speed of the pallet (1), but manual winding is also possible. That is, the flexible seams 1-(8)i block the ventilation flowing into the empty pallet (1), and allow air to flow through the raw material layer to prevent the raw material layer from being half baked, thereby improving the yield.

This will be explained in more detail based on examples. Inside the pallet 2.
Sintering raw materials were charged into a sintering machine with a length of 49 m and an effective pallet length of 4477+ to a uniform layer thickness of 550 mm, and the pallet speed was set at 1.
It was decided to restart the operation at a speed of 5 m/min.

That is, as illustrated in Fig. 1, a winder (
9) is installed, and a flexible sheet (8) made of thick nylon sheet with a width of 2.4 m, which is slightly narrower than the inside of the pallet, is placed on one end of the winding machine (9) so as to cover the top of the empty pallet I-(1). Fix it and extend the other end to just after the ignition furnace (4), then attach the empty pallet (1)
covered the surface. In this state, ignite the ignition furnace (4), fully open the wind box opening/closing damper (7),
The main exhaust fan (6) installed in the main exhaust pipe is operated to cut the bedding ore from the bedding hopper (2) and drive the pallet, and then the surge hopper (2) storing the sintering raw materials is operated.
The raw material was cut out from 3) and the sintering machine was restarted.

On the other hand, according to the conventional method, "while igniting the C1 ignition furnace,
All opening/closing dampers at the lower end of the wind box are closed, the main exhaust fan installed in the main exhaust pipe is operated, and the bedding ore is charged without driving the pallet.
The operation was restarted with a constant thickness of 0fr4. At this time, the sintered ore was manufactured while sequentially opening the opening/closing dampers at positions corresponding to the packed bed section after the tip side of the sintered raw material layer.

FIG. 3 is a diagram showing the wind speed patterns of the wind box in the method of the present invention and the conventional method. The figure (a) shows the passing situation of the tip of the raw material layer, and the figure (b) shows the wind speed pattern of each wind box. In the figure, the dotted line is the wind speed pattern in the conventional method, and the solid line is the wind speed pattern in the method of the present invention. As is clear from the figure, in the conventional method, when the tip of the raw material layer is at the 0 point (black 8 wind box) or the 0 point (boiled 14 wind box), the wind speed is 0.1.
~0.2m/s, and about 0.5m/s is flowing at point 0 (518 wind box) in the ore discharge section. In contrast, the method of the present invention gives 0 points, and 0 points range from 0.3 to 0.
There is a wind speed of 5 m/s, and the wind speed is 1.57 at point 0 in the ore discharge area.
71/S, approaching (and increasing to a degree) the wind speed pattern during normal operation shown by the dashed line.

As a result, the initial effective area (medium 2.577Z x length 44
In the present invention, the yield of sintered ore corresponding to m = 110rrf) was 67%, whereas in the conventional method, no sintered ore could be produced due to lack of ventilation and no sintered ore was burned. .

As described above, the method of the present invention can greatly improve the yield of sintered ore when restarting the sintering machine after it has been stopped due to repairs or failure.

In addition to thick nylon, the flexible sheet in the present invention may be made of thick cloth or the like. In addition, the winding of the ore discharge section is not limited to mechanical winding (it may also be rolled up manually). It may also be burned.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of a device for carrying out the present invention, Fig. 2 is a diagram showing details of a winder, and Fig. 3 is a diagram showing wind speed patterns of the wind box in the method of this invention and the conventional method. be. In the diagram, 1...pallet, 2...bedding hopper, 3...
... Surge hopper, 4... Ignition furnace, 5... Wind box, 6... Main exhaust fan, 7... Opening/closing damper, 8... Flexible sheet, 9... Winder , 10...
Traveling rail, 11... Traveling wheel, 12... Traveling drive device, 13... Winding shaft, 14... Winding drive device. Applicant Sumitomo Metal Trading Co., Ltd. Figure 1 Figure 2 (al Figure 3 (a) Pallet No.

Claims (1)

[Claims] In a method for producing sintered ore in which sintering raw material is supplied to the starting end side of a pallet that is driven endlessly in a sintering machine and ignited, and air is taken in from below the pallet, when restarting the sintering machine after stopping, A method for producing sintered ore, which comprises sintering an empty pallet in a state where sintering material is not supplied while covering it with a flexible sort.