JPS59119178A - Method of treating slag for metallurgy - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating metallurgical slag in furnaces, converters, etc. The slag discharged from metallurgical furnaces is in a high temperature molten state of 1400 to 60°C (°C), and has a sensible heat amount of 400°C. XL 03k
It has more than ca4/l-s&g.

Many methods have been developed to recover the heat contained in this cylindrical metallurgical slag, but one method is to cool the metallurgical slag on the surface of a rotating drum through which a cooling medium flows and solidify it into a thin plate or rod shape. has also been adopted. For example, the fruit 1 in Figures 1 and 2! f! In FIG. 1, which shows an example of an embodiment, both ends of a cylindrical drum 11 are sealed with lid plates. The drum 11Vi is rotationally driven in one direction.

Inside the sealed drum 11, a plurality of injection holes 16 for injecting refrigerant toward the inner wall of the drum are provided in the axial direction. A refrigerant supply pipe is connected to this injection nozzle 16 .

The slag in the slag ladle 14 is supplied to the outer peripheral surface of the drum 11 through the gutter 13 and the slag supply port 12, and the lower layer of the slag is cooled and solidified on the surface of the drum. Further, the upper surface of the slag is cooled and solidified by the air jetted from the cooling air jet nozzle 24. The cooled solidified slag 20 is released from the mold by a scraper 15. In addition, as a mold release agent, milky lime or the like is sprayed onto the drum from a spraying device 25 as appropriate.
No. 206), this device allows the cooling medium to flow inside, has a protrusion E on the outer periphery almost parallel to the axis, and has a rotating body A rotating in one direction and a rotation angle θ of the rotating body. It consists of a cooling device B, which has smooth surfaces facing each other so as to maintain a constant gap on the outer peripheral surface of the moving section where the angle is at least 120 degrees, and in which a cooling medium flows. The present invention is characterized by having an inlet port C and the other port 7 serving as an outlet for the solidified sludge, in order to recover heat from the cooling medium flowing through the rotary body and the cooling gutter during the treatment of metal sludge.

All of these methods are aimed at heat recovery, but in each case the equipment becomes larger in relation to the operating speed of the molten slag. The problem is that it is very difficult to provide a stable and effective supply.

In other words, since the processing capacity per unit area of the drum surface is approximately - if the cooling conditions are determined, it can be seen from the following formula that once the processing capacity per unit time is determined, the size of the cooling drum can be determined.Oc = K- D-L-N where C=Sludge processing capacity (t/Hr) K-Constant determined by slag processing conditions D-Drum diameter (m) L-Drum effective length 77? ) Number of N-Slag Processing Devices If it is desired to increase the slag processing capacity, the following measures can be considered: 1) Increasing the drum diameter II) Increasing the drum length 111) Increasing the number of strip processing devices.

The method i) of increasing the drum diameter is disadvantageous in terms of device weight and driving power. 11) In order to increase the drum length, it is necessary to branch the molten slag gutter into multiple branches in order to spread the molten slag uniformly.
Furthermore, cleaning and repairing the gutter becomes complicated. In addition, when recovering metallurgical slag, the slab discharged from the furnace can be directly led to a treatment device and treated, or once received in a slag pot or the like and then treated, but in both cases continuous treatment is possible. It is very difficult to do this, and it is unavoidable if the work is done intermittently. In this case, it is naturally necessary to clean up the solidified slag in the gutter and maintain and repair the gutter.

As the length of the gutter increases and the shape of the gutter becomes more complex, the cost of gutter maintenance work increases as well.

Furthermore, a similar problem occurs with the method of increasing the number of drum bases in 111). Moreover, in this case, the VC is disadvantageous in terms of equipment costs due to the increased number of drives and drum speed control devices.

Figure 3.4 shows 11) to increase the drum length and 111.
) shows an example of the current arrangement of bath melt slag gutter to increase the number of drums.

Figure 3 shows a method of supplying molten slag to one long drum type processing device. In order to supply slag 4 in a thin layer to a horizontal cylindrical drum 1, the slag gutter 2 is multi-branched. The molten slag must be evenly supplied from each of the molten slag supply ports 3. The pitch of the supply port is 1f depending on the equipment conditions.
Approximately fi is appropriate.

FIG. 4 shows a method of feeding molten slag 4 to two long drum-type processing devices, which makes the problem even more difficult.

On the other hand, in order to make effective use of the drum surface to demonstrate the capabilities of the processing and cooling equipment, it is also possible to install a small capacity molten slag storage tank directly above the drum, and one example is shown in FIG. ■ is a rotating drum, 5 is a solid 6t cooler, 6
7 is a molten slag dripping hole, and 7 is a molten slag seal part. In this case, since the slag is accumulated, the drum has a certain amount of slag.
However, in the storage section, the slag on the drum surface is cooled from the bottom, but it is heated by the molten slag from the top, so it is difficult to maintain the desired cooling rate.The present invention overcomes these drawbacks. This method was developed with the aim of providing a simple method to solve the problem, and its characteristics include a method in which a molten slab is cooled on the surface of a rotating drum through which a cooling medium flows, solidifying it into a thin plate or rod shape. The axial direction of the rotating drum surface is inclined with respect to the horizontal plane, the molten slurry is supplied from the inclined upstream side of the drum surface, and the molten slurry is spread uniformly in the axial direction of the rotating drum by flowing under its own weight to the inclined downstream side. A method for treating metallurgical strips is characterized in that:

Hereinafter, the present invention will be explained in detail with reference to drawings of embodiments.

FIG. 6 shows an example in which the axis of the cylindrical rotating drum l is inclined with respect to the horizontal plane, and the angle of inclination θ is preferably in the range of 3 to 20 degrees. If this temperature is below 3 degrees, the molten slag temperature will increase and the viscosity of the slag will increase, making it difficult for the bath molten slag to be supplied to the downstream side. This is because it is supplied.

The molten slurry is supplied from one point above the inclined upstream side of the end of the rotating drum 1, and excess slag is fed to the slag guide 8.
It flows along the drum surface, inside and on the upper surface of grooves or protrusions provided in the axial direction, by its own weight, toward the downstream side of the slope, and reaches the other end.

By tilting the drum in this way, the syslag can be evened out.
It is possible to increase the drum length with expansion. The slag is cooled while passing between a rotary drum 1 through which a cooling medium flows and a fixed cooler 5 placed opposite the drum at a constant interval on its outer periphery, solidifies into a thin plate or rod shape, and is discharged from the discharge port. , which recovers the heat contained in the molten slag.

The molten slurry can be easily fed to the drum by adjusting the inclination using the tiltable slag pot 9 and tardish 10, thereby making it easier to feed the molten slurry to the drum.

Figure 7 shows another embodiment in which the axis of the drum 1 is horizontal and the drum l
By making the shape of a truncated cone and setting the cone angle θ to 3 to 20 degrees, the same effect as in the case of FIG. 6 can be obtained.

Figure 8 shows yet another embodiment in which the rotating drum is barrel-shaped, the shaft is horizontal, and the drum surface has downwardly inclined surfaces from the center of the drum in the axial direction to the left and right ends of the drum. It is something. The angle of inclination is 3 to 20 degrees, which is the same as in the above case. The molten slurry supplied from above the center of the drum flows simultaneously on the left and right inclined surfaces and spreads uniformly over the entire length of the drum. According to this method, it is possible to further increase the length of the drum compared to the examples shown in FIGS. 6 and 7.

As described above, the present invention supplies molten slurry from a single location in the tube station, so it is possible to eliminate the complicated operations of fed-batch distribution, cleanup, and repair related to multi-branching of the bath slag phase. It has excellent effects such as being able to increase the length of the gutter more than increasing the number of drums because it can solve the problem of multi-branching of the gutter. is 0

[Brief explanation of drawings]

Figure 2 is a diagram showing an embodiment of manufacturing a thin plate-shaped slab by a conventional method, Figure 2 is an explanatory diagram of an apparatus that the present inventors have already applied for, Figures 3 (A), (-1 Figure 4) (A) and (0) are diagrams showing the current arrangement of the molten slag gutter, Figure 5 (('l) and (B) are explanatory diagrams of an example in which a small-capacity slag storage tank is installed directly above the drum, and Figure 6 Marks, (0), Fig. 7 ((a), (0) and Fig. 8 ((a), wa) are respectively open diagrams of the embodiments of this example. ■...Horizontal Cylindrical drum 2... Slag gutter 3... Molten slug supply port 4 - Slag 5... Identification cooler
6... Molten slag)) Reservoir 7... Molten slag seal part 8... Slag nod 9... Molten slag pot 10...
Tashidish (0) Figure 6 (b) ・15'7 Figure 8 (111)

Claims (1)

[Claims] In the method of cooling the molten slab on the surface of a rotating drum through which a cooling medium flows and solidifying it into a thin plate or rod shape, the axial direction of the rotating drum surface is inclined with respect to the horizontal direction, and the molten slag is A method for treating metallurgical slag, characterized in that the molten slag is supplied from the inclined upstream side of the drum surface - Okadoro, and is made to flow on the inclined upstream side by its own weight so that the molten slag spreads uniformly in the axial direction of the rotating drum.