JPS5832045A - Cast mold for slag solidification - 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 mold for solidifying metallurgical slag such as blast furnace slag, converter slag, and electric furnace slag, and its purpose is to provide a mold that allows easy heat recovery. In addition to providing a mold that has good workability and is suitable for large-volume processing, another objective is to provide a mold that is suitable for producing solidified slag with a high amorphous content.

As is well known, in recent years various means have been developed to effectively recover the heat possessed by metallurgical slag in a molten state. ) A circulation system path 2 is provided to form a circulation system with a steam/water separation drum 3 to mainly vaporize the mold 1.
There is a means for recovering the heat retained in the molten slag 4 injected into the molten slag 4. This method is considered to be practically useful because it has a simple structure with few failures, but this method of discharging assimilated slag by opening the bottom plate 5, which can be opened and closed in a vertically long mold with a rectangular cross section, is surprisingly difficult to solidify. Technical issues remain, such as the fact that the slag does not fall off easily, making it difficult to work with, and that the mold becomes distorted due to repeated use, making it more likely to crack and damage the heat medium circulation system. It turned out that there was.

Therefore, the inventors of the present invention have developed a shallow dish-shaped split mold 6 as shown in FIG.
b (hereinafter referred to as a split mold) is a so-called mating mold, with end surfaces 7a and 7b serving as mating surfaces, forming a shallow dish mold. In this state, if molten metallurgical slag is injected from a slag pot, the metallurgical slag becomes a thick plate and solidifies.

At this time, the thickness t of the metallurgical slag is preferably 100 W or less on average from the viewpoint of heat recovery efficiency. This is because metallurgical slag has low thermal conductivity and heat transfer coefficient, and if it is thicker than that, the recovery rate will be poor. However, if you make the rest shallower, for example 5
To make it less than 0m, a huge mold (for example, a flat area of 40m) is required.
0 m2, etc.), which increases equipment costs.

The divided molds 6a' and 6b are provided with circulation paths 8m and 8b for a heat medium (usually water, but other materials such as fluorocarbons can also be used). It is cyclically connected to separation drums 9m and 9b. 10
a and 10b indicate circulation pumps.

The circulation system path includes various valves, circulation pumps, safety valves,
A make-up water tank, a heat exchanger, and other normally necessary equipment are provided, but explanations and illustrations are omitted.

Next, FIG. 3 shows a schematic top view of a shallow dish mold according to an embodiment of the present invention. lla, 11bH High-pressure flexible hose on heat medium inlet side, high-pressure flexible joint, etc. split molds 6a, 6b
The structure is such that the supply of the heat medium will not be hindered by the rotation of the high pressure flexible hose 12a on the outlet side of the heat medium.

The same applies to 12b. Reference numerals 14a to 14d are rotating shafts that support the split molds on the bottom surface, and a rotation drive device 13a.

Figures 4(,), (b), and (c) are schematic diagrams showing the process sequence for discharging solidified slag from a shallow dish mold according to the present invention, and the solidified slag is in the state shown in Figure 4(,). The slag solidification mold of the present invention has such a structure, so it has the advantage of excellent heat recovery efficiency, good workability, and extremely low failure rate. has.

In addition, when a heat medium circulation path is built into a split mold, methods such as using the mold as a box and filling the tube with a carbon stamp, casting the tube around it, or welding and fixing the tube may be adopted as appropriate. The best results can be obtained by filling the piping with a carbon stamp because damage to the box will not propagate to the piping.

Furthermore, in order to rotate the split mold, a means such as a support beam type and tilting method may be used, or a means for separating the split mold to the left and right may be adopted.

Furthermore, a heat medium circulation type radiation or conduction heat absorption plate may be provided above the shallow dish mold of the present invention, thereby making it possible to further improve the heat recovery rate.

Since the cooling effect of the present invention is good, the solidified slag obtained has a large amorphous content compared to other known methods (for example, if the slag thickness is reduced to 5 to 50 m, the amorphous content can be reduced by 50 m).
It has the advantage that it can be used for various purposes such as cement raw materials and continuous casting powder.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a known slag solidifying mold, FIG. 2 is a schematic cross-sectional view of a mold according to the present invention, FIG. 3 is a schematic top view of a different mold according to the present invention, and FIG. ),
(b) and (c) are schematic explanatory diagrams showing a procedure for discharging solidified slag from a mold according to the present invention. DESCRIPTION OF SYMBOLS 1... Mold, 2... Heat medium circulation system path, 3... Steam/water separation drum, 4... Molten slag, 5... Bottom plate, 6...
...Shallow dish mold, 6a, 6b...Divided mold, 7 m,
7b... End face, 8a, 8b... Heat medium circulation path, 9a, 9b... Steam/water separation drum, 10a,
10b-denzo, 11a. ], 1 b...inlet hose, 12a, 12b...
Outlet hose □(5) Hose, 13a, 13b- Rotation drive device, 14a~
14d...Rotation axis. (6)

Claims (1)

[Claims] A slag solidification mold which is a shallow dish mold for receiving molten slag, the mold is a two-part mating mold, and the mold has a built-in heat medium circulation system.