JPH06330112A - Device and method for treatment of slag - Google Patents

Abstract

PURPOSE:To save a slag treatment process and to reduce its treatment area to reduce the cost of the treatment by continuously turning over or agitating and mixing the slag in a molten state subjected to discharge to a pit by a ploughing device, thereby dispersing and solidifying the slag. CONSTITUTION:The slag generated in a refining stage of molten metal in a converter, etc., is discharged to a converter ladle 1 which is then transported by a converter ladle car 2. The slag in the molten or half molten state is subjected to skin holing 2 and is released 3 to a pit or yard. The ploughing device 4 is moved from one side end right thereafter to impart spiral motion to repeat ascending and descending to the slag in the pit or yard. The ploughing device 4 is preferably provided with a ploughing surface having a plane or curved contact surface with the slag and having projections or grooved guides, etc., on this contact surface. As a result, the cooling area of the slag is easily increased and the solidified slag is made into small lumps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for treating slag containing metal, which is generated in a refining process of molten metal, particularly in a molten and semi-molten state.

[0002]

2. Description of the Related Art The slag generated in the refining process of molten metal varies widely depending on the refining method and the composition of the slag. Conventionally, this slag has been cooled, solidified, and crushed, and then separately adjusted and supplied as roadbed material and landfill. For example, in the process of processing steelmaking slag, the slag containing the ingots discharged from the converter to the converter pan truck is first tilted and discharged into the pit or yard. Here, the slag is forcibly cooled by sprinkling water or the like, and then left for a certain period of time to naturally cool the slag to a predetermined temperature.

Next, the slag that has been cooled and solidified in the pit and the yard is excavated to an appropriate size by a heavy machine or a bulldozer, and is carried into a separate yard by a truck or the like. Here too, it is left outdoors for a predetermined period,
During this time, the slag is partly atomized due to natural collapse,
Then, it was carried into the final processing plant, further crushed and separated by a crusher, etc., and adjusted to a size suitable for roadbed materials and landfill.

In the above conventional slag treatment, the working process is complicated, and it takes a considerable time for cooling and solidification and excavation to further crush and fractionation, and the treatment equipment requires a considerable amount to install a wide variety of machines. It takes an area and its cost is a problem. Further, recently, there has been a demand for a drastic review of the treatment process due to the improvement of the working environment due to dust and the like during the slag treatment and the restriction of the treatment site. As this known technique, for example, Japanese Patent Laid-Open No. 3-202
In 406 publication, separation of the ingot and slag in the slag and pretreatment of crushing are performed in the early stage of the treatment, all the slag containing the ingot is discharged, and the semi-molten or solidified slag is continuously and collectively. A method and apparatus for processing is disclosed.

However, these conventional techniques are still insufficient in terms of efficiency of slag treatment and environmental problems,
Further, it has been desired to develop a slag treatment technique that achieves high efficiency of treatment, uses slag more effectively, and further reduces treatment cost.

[0006]

SUMMARY OF THE INVENTION The present invention solves the problems of the prior art and discharges slag generated during refining of molten metal into a pit or yard, and immediately after that, in a molten or semi-molten state. The purpose of the stirring is to accelerate the refinement and solidification. That is, even if the stirring force is not so large at the stage of the liquid slag, it is possible to give a sufficient stirring motion, and this stirring simply achieves an increase in the cooling area of the slag, and when the slag is solidified, (EN) Provided are a slag processing method and apparatus capable of solidifying without forming a large lump by closely contacting each other.

[0007]

The present invention is to solve the above-mentioned problems, and the gist thereof is to provide a method for treating slag generated in the refining process of molten metal,
Molten or semi-molten slag is discharged into a pit or yard, and immediately after that, the slag is melted by a tilling device that moves while imparting a spiral motion that repeats rising and falling from one side end. Alternatively, it is a method for treating slag, characterized in that it is dispersed and solidified by continuously inverting or stirring and mixing in a semi-molten state.

Further, in a treatment apparatus for slag generated in the refining process of molten metal, the slag is moved while being imparted with a spiral motion of repeating rising and falling, and the slag is continuously melted or semi-molten. A cultivating device that disperses and solidifies by inversion or stirring and mixing is provided on the cultivating device, and the cultivating device has a contact surface with the slag that is a flat surface and / or a curved surface, and a protrusion and / or a groove-shaped guide, etc. It is a slag processing apparatus characterized by providing the cultivating plate which it has, and also in the slag processing apparatus in which the said cultivating plate is operated by at least one or more sets of arms or crane operation.

[0009]

The operation of the present invention will be described below. The present invention, in order to sufficiently stir the slag, by pressing a flat or curved plate in a molten or semi-molten state, the slag moves forward or diagonally while rising,
After that, the dropping is repeated, and as a result, a spiral motion is given to the entire slag to mix and stir.

Therefore, the new slag surface is constantly exposed to the upper atmosphere. By this plowing movement, the slag is divided in a molten or semi-molten state, and solidifies in that state, so the slag becomes a lump, and cooling heat removal on the slag surface is accelerated, and a considerably large thermal stress is generated in the slag, This stress causes natural collapse. Further, when the above-mentioned plowing motion rises, the impact force at the time of falling also becomes the driving force for crushing the slag. The slag that has been cultivated by these adheres to each other and is finely solidified without forming a large lump.

In the slag processing method of the present invention, finely divided slag can be obtained by a simple method, the conventional slag processing step which takes a long time can be simplified or omitted, and the particle size after the slag processing can be reduced. The distribution and composition are stable. further,
The processing apparatus of the present invention is to provide a plowing plate for plowing on the front surface of an ordinary bulldozer used in an existing pit or yard.

[0012] As the slag rises on this tiller,
Anything that can be pushed forward or diagonally may be used. It is preferable that it has a curvature, but it may be a flat surface. Generally, the discharge thickness of the slag depends on the hardness and composition of the slag, but this thickness is usually around 300 mm. Depending on the slag thickness, it may be advantageous to impart a spiraling motion by pulling the direction of tillage with respect to the slag in the arm direction of the tiller plate, ie towards the front. If necessary, the present invention is, with respect to the slag surface, in parallel to a plane perpendicular to the slag thickness direction, the main requirement is that it is possible to cultivate by imparting a spiral motion by applying a moving force in a diagonal direction by a flat surface or a curved surface. .

Furthermore, more preferably in order to promote the spiral movement of the slag by the tilling plate, it is provided with a spiral guide and / or a grooved guide, which promotes the rise of the slag. In particular, the composition of the slag exhibits various properties in a wide range, and in the case of refining of a certain kind of molten metal, the thickness of the slag varies widely, and when the slag thickness increases and the spiral motion becomes difficult. The above-mentioned guided tillage plate is more advantageous.

[0014]

EXAMPLES The present invention will be described in more detail based on examples. FIG. 1 is a schematic diagram of a steelmaking slag treatment process of the present invention. The slag discharged from the converter is poured into the converter pan 1,
It is transported to the slag processing plant by the converter pot car 5. Before the slag is discharged, if the surface of the slag inside the pot car is stuck to a river, the skin rupture hole 2 is discharged to break the slag and make it easier to discharge.

Thereafter, the discharged slag 3 is cultivated by a tiller 4.
This is the process of tilling by the method, finally bringing it into the processing plant, and adjusting the final particle size here. 2 to 5 show schematic diagrams of the tilling process. The converter slag is discharged from the converter pan 1 to the pit and the yard, and spreads to the state of the discharged slag 3 and to the pit or the yard. In this figure, the slag is discharged vertically to the traveling direction of the steel slag pan. Discharged slag 3
2, the cultivating direction 6 of FIG. 2 is cultivated by the reciprocating movement of the cultivating plate device 4 having the cultivating plates inclined from both ends in the direction perpendicular to the discharge direction, and in this embodiment, by one bulldozer. Become.

The slag which has been tilled is gradually moved to the sprinkling cooling site side 7. FIG. 3 shows another embodiment, in which the direction of tillage is the same as the discharge direction, and the case of tilling from the rear to the front of the discharge is shown. In this case, the tiller 4 comprises an arm 10 of an inclined tiller plate 8.
At the start of tilling, the tiller plate 1 is extended to the side of the steel slag pan 1 to move the tiller plate 1 to the converter pot 1 side, and is moved while cultivating by the side surface of the arm 10 of the tiller plate 8. Then, after the start of the plowing, the plowing is gradually advanced while pulling the slag toward the front side.

Then, the slag which has been tilled is pushed out to the lateral sprinkler cooling field 7 by the discharging heavy machine 9 and carried out. FIG. 4 shows still another embodiment. In this case, the tilling plate 8 is inclined in both left and right directions, and the forward movement of the arm 10 causes the tilled slug to perform a spiral movement in both left and right directions. FIG. 5 is a modification of FIG. 4 and shows an embodiment in which the cultivating plate 8 is not inclined.

The above is one example of the embodiment of the present invention, but the cultivating plate may have a flat surface and / or a curved surface.
A curved surface having a slight curvature that allows the slag to easily rise is preferable. Further, the inclination angle of the cultivating plate is preferably about 60 degrees or less. If necessary, the present invention, the slag is given an upward and downward movement by the cultivating plate, continuously performs mixing and stirring by a spiral motion in an oblique direction with the movement of the cultivating plate, and always exposes the new slag surface to the cooling atmosphere. Any method can be used as long as it can obtain a cooling rate that enables dispersion and solidification in a subdivided state, and does not particularly define the angle of the tilling plate.

Next, the tiller of the present invention will be described in more detail. FIG. 6 shows the movement of the cultivating plate 8 and the slag 3 according to the present invention.
It is explanatory drawing of the spiral motion given to. At the start of tilling, the slag is given an ascending force as shown in FIGS. (A) and (b) and starts to rise. In the diagram (c), the first rising slag starts to fall as the next rising slag rises. Next, as shown in Figs. (D) and (e), the slag that has once descended is repeatedly raised and lowered slightly by the tilling plate. If this state occurs continuously, a complete spiral motion of the entire slag will be realized.

FIG. 7 is a schematic view of an embodiment of the tilling apparatus of the present invention. The cultivating device 4 having the cultivating plate 8 is a normal bulldozer in this embodiment. The movable direction of the tilling plate 8 includes a vertical lifting 11, a tilting 12 related to the rising angle of the slag, and an angling 13 related to the tilling direction, which can be freely adjusted by the tilling plate arm 10.

FIG. 8 shows another embodiment, which is the case of an arm type tiller. The cultivating plate 8 faces the direction of the arm 10, and the cultivating direction makes it possible to impart a spiral motion to the slag by the motion of pulling the slag toward the front side. In this embodiment, the tilling plate 8 can be adjusted by moving the lifting 11 and the tilting 12. FIG. 9 shows an embodiment of a ski-type tiller. In this embodiment, the cultivating plate 8 is inclined on both sides, and the movement of the arm 10 causes the spiral movement of the slug to proceed in both directions at the same time. Also in this case, the adjustment of the tilling plate 8 is performed by lifting 11 and tilting 1.
Made by 2.

FIG. 10 shows an embodiment of a rake type tiller. The cultivating plate 8 of this embodiment is in the shape of a rake, and is an example of cultivating as a multi-row ridge by a plurality of cultivating plates. FIG. 11 shows the result of sieving the dispersion-solidified slag by actually applying spiral rotation to the converter slag and mixing and stirring according to the above examples. According to FIG. 11, it can be seen that the present invention significantly improves the sieve mesh non-passage index (particle size exceeding 250 mm) as compared with the conventional method. Further, it is apparent that the improvement is further achieved as compared with the improvement technique of the previous patent application by the present inventor shown as a comparative example.

[0023]

As is apparent from the examples of the present invention, the present invention is a molten or semi-molten state of molten metal slag, and the slag is spirally rotated by a tiller to mix and stir,
It is possible to efficiently subdivide the slag based on the promotion of dispersion solidification to subdivide the slag, simplifying the slag treatment step compared to the conventional method, and reducing the treatment area extremely. The processing cost is extremely reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a converter slag processing step according to the present invention.

FIG. 2 is a diagram showing an example of a tilling process according to the present invention.

FIG. 3 is a diagram showing a second embodiment of the tilling step according to the present invention.

FIG. 4 is a diagram showing a third embodiment of the tilling step according to the present invention.

FIG. 5 is a diagram showing a fourth embodiment of the tilling step according to the present invention.

FIG. 6 is an explanatory view of tillage according to the present invention.

FIG. 7 is a front view and a plan view of FIG.

FIG. 8 shows a second embodiment of the tilling device of the present invention,
It is a front view and (b) top view.

FIG. 9 shows a third embodiment of the tilling device of the present invention,
It is a front view and (b) top view.

FIG. 10 shows a fourth embodiment of the tilling device of the present invention,
It is a front view and (b) top view.

FIG. 11 is a diagram showing an effect of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Converter pan 2 ... Skin rupture 3 ... Discharge slag 4 ... Plowing device 5 ... Converter pan wheel 6 ... Plowing direction 7 ... Sprinkler cooling field 8 ... Plowing plate 9 ... Discharge heavy machine 10 ... Plowing plate arm 11 ... Lifting 12 … Chilling 13… Angling

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshimi Watanabe, 370 Sakata, Kimitsu-shi, Chiba, within Hamada Heavy Industries Ltd. Kimitsu Branch (72) Inventor Sanmaru, 370, Sakata, Kimitsu, Chiba, within Hamada Heavy Industries Ltd., Kimitsu Branch (72) Inventor Hirogo Murakami 370 Sakata, Kimitsu-shi, Chiba Hamada Heavy Industries Ltd. Kimitsu Branch

Claims (3)

[Claims] 1. A method for treating slag generated in a refining process of molten metal, in which molten or semi-molten slag is discharged into a pit or a yard, and immediately thereafter, the slag is raised and lowered from one side end. A method for treating slag, characterized in that the slag is dispersed and solidified by continuously inverting or stirring and mixing the slag in a molten or semi-molten state by a tilling device that moves while giving a spiral motion to repeat the above. 2. A treatment apparatus for slag generated in a refining process of molten metal, which is moved in a molten or semi-molten state while being moved while imparting a spiral motion to the slag which repeats rising and falling. A cultivating device that dispersively solidifies by inverting or stirring and mixing is provided, and the cultivating device has a contact surface with the slag that is a flat surface and / or a curved surface, and the contact surface has a projection and / or a groove guide. An apparatus for treating slag, characterized in that a cultivating plate having the above is provided. 3. The apparatus for treating slag according to claim 2, wherein the cultivating plate is operated by at least one set of arms or a crane operation.