JPH0718656B2 - Molten metal container pouring construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for pouring a molten metal container such as a casting floor gutter of a blast furnace.

2. Description of the Related Art In recent years, the repair of cast floor gutters and the like of blast furnaces has been replaced with conventional lining construction of refractory bricks and the like, and casting of irregular-shaped refractory materials has been performed. Therefore, a mixer on the side of the cast floor gutter,
There is an increasing number of operations in which a kneading device or the like is installed to knead and prepare the required irregular-shaped refractory material and pour it into a casting floor gutter.

Problems to be Solved by the Invention However, in a small-sized or medium-sized blast furnace, etc., the casting floor in front of the furnace is narrow, and it is not easy to carry in and carry out mixers and kneading devices, and the capacity and number of these devices are large. There is also a limit,
It was not possible to pour the pouring material into the casting floor gutter in a short amount in a short time, and it was necessary to knead and prepare every 0.25 to 0.5 m ³ and pour it sequentially, which took a long time.
Therefore, in cast floor gutters that handle molten metal in blast furnaces, etc., the casting material is hardened by high heat quickly and the fluidity of the material is poor, resulting in a construction body with many porosity due to splicing layers, cracks, cavities, etc. This was the cause of the leaked iron accident and the shortened gutter life. Furthermore, dust and dust caused by the kneading work, steam and dust produced by the poured material are generated, the working environment is not good, and the load of high-temperature work for a long time is severe for the worker.

Means for Solving the Problems The present invention has been made in view of the above points, and kneads a cast material having an indeterminate fire resistance at a place different from a repair site of a molten metal container such as a casting floor gutter of a blast furnace. Prepared and kneaded The prepared pouring material is loaded into a large capacity bucket of several tons and transported to the repair site of the molten metal container, and the pouring material loaded into the large capacity bucket in the molten metal container prepared for repair Is poured in a substantially continuous state so that heat curing does not occur, and a large amount of the poured material can be poured in a short time in a substantially continuous state, so that the heat setting of the poured material can be delayed, such as a splicing layer or a cavity. It is possible to prevent the occurrence of leaks, to prevent leaking accidents of the construction body, to extend the life of the gutter, and to reduce the load of high heat work for a long time and improve the work environment, etc. There is a way to provide.

Examples Hereinafter, the present invention will be described based on Examples.

1 and 2 show an embodiment of the present invention, which is carried out on a blast furnace cast floor gutter. The casting bed 1 is provided in the lower part of the blast furnace 2 as shown in FIG. 1 and is provided with alumina-carbide inside an externally-coated fire-resistant wall 3 which is a permanent covering surrounded by refractory material such as bricks as shown in FIG. A casting bed gutter 6 which is a molten metal container having a lined refractory wall 5 therein is formed by charging a casting material 4 prepared by kneading a silicon-carbon type amorphous refractory material or the like, and tapped from the blast furnace 2. The molten pig iron is stored and can be freely discharged into the tope car 7. As shown in FIG. 1, a jib crane 8 and an overhead traveling crane 9 are arranged on the upper part of the casting floor gutter 6 which is the molten metal container, and the jib crane 8 and the overhead traveling crane 9 are transferred from the outside by a transfer device 10 such as a truck. A large-capacity bucket 11 loaded with about 5 tons of the pouring material 4 can be hung and conveyed, and the pouring material 4 is sequentially and almost continuously poured into the casting floor gutter 6 as shown in FIG. The casting material 4 is the first
As shown in the figure, kneading and preparation is performed in a kneading factory 12 which is located a little away from the casting bed 1 and is located away from the casting bed 1. In the kneading factory 12, as shown in the figure, a plurality of large-capacity mixers 13 with a capacity several times larger than the conventional one, such as 1 to 2 m ^3, are installed. Kneaded and prepared by the above, and sequentially loaded into the bucket 11 through the transfer device 14 such as an overhead crane, transferred to the casting floor part 1 through the transfer device 10 according to the repair process, and poured into the casting floor gutter 6 for repair. It is something that can be done. In addition, the large capacity bucket 11 described above has a second
As shown in the figure, the legs 15 are provided on the outer periphery to fix the middle frame of the casting floor 1
It can be installed freely on the holding frame 17 for preventing the floating of the middle frame installed on 16 and can be hung by providing the hanging part 18 on the upper part. Furthermore, the pouring material 4 is segregated during the transportation, A segregation / separation prevention plate 19 such as a net plate for preventing sedimentation or separation is installed at an appropriate position in the central portion or side portions. 20 is a bucket discharge valve, 21 is a discharge port, and 22 is a gutter frame.

Operation When repairing the lining fireproof wall 5 of the cast floor gutter 6 of the blast furnace 2, however, the lining fireproof wall 5 that is worn according to the process table is repaired.
2 to dismantle the demolition waste, and install the gutter middle frame 22 on the middle frame floating prevention presser stand 17 installed on the middle frame fixing part 16 on the upper part of the casting floor gutter 6 as shown in FIG. Prepare for pouring. On the other hand, in parallel with the above-mentioned preparatory work, as shown in Fig. 1, a predetermined mixer is used to mix a predetermined refractory material into a large-scale mixer at a kneading factory 12 separate from the construction site.
A predetermined amount of the pouring material 4 is prepared by kneading at 13 and loaded into a plurality of required large-capacity buckets 11, respectively, and the casting bed 1 is prepared by the transport device 10 of the truck according to the work plan.
It is to be carried into the department.

In this way, while performing the work such as dismantling the lining refractory wall and installing the middle frame in the high-heat casting floor part as in the conventional case, the pouring material is mixed and prepared in parallel at another place, It is possible to prevent dust from being generated in the casting floor, improve the working environment at the construction site, and ensure that the kneading plant has a limited space and the required space, so it is possible to install multiple large mixers. It is possible to knead and prepare a required large amount of casting material in a short time. And
It can be loaded into a large capacity bucket, and the pouring preparation posture can be adjusted according to the process of the preparation work of the cast floor gutter to shorten the construction work.

Since the bucket is equipped with a segregation separation prevention plate, even if the pouring material is loaded and conveyed, it is possible to prevent the material from separating due to segregation or sedimentation. It is possible to maintain the same quality as the kneading preparation.

Then, as shown in FIG. 2, the bucket 11 waiting for loading via the overhead crane 9 or the jib crane 8 is transported to and installed in the pouring portion of the casting floor gutter 6 which has been prepared for pouring, and the bucket unloading valve 20 is opened. When the discharge port 21 is opened, the pouring material 4 is covered with the gutter frame 22 as shown in the figure.
It flows into the inside of the and forms the lining fireproof wall 5. When the inflow of the pouring material 4 into the first bucket 11 is completed, similarly, the buckets 11 waiting to be carried in are sequentially transported and loaded with a required amount, and dried and cured at a predetermined temperature for repair.

In this way, since the pouring material using a large capacity bucket of 2 to 5 tons is flowed in, a large number of materials can be flowed in and loaded in a short time by pouring several times in a bucket, and the material can be flowed in almost continuously. Thus, it is possible to delay the thermosetting of the pouring material and to load the pouring material into the inside uniformly with good fluidity. Therefore, it is possible to prevent a splice layer from being formed between the inflowing material and cracks, cavities and the like, and to form a construction body with few pores and a high packing density.

An example of the above construction method is shown in the following table when compared with the conventional construction method.

Table 1 relates to the construction status of the construction according to the present invention and the conventional construction, and Table 2 shows the same at 110 ° C., 2
It is related to the specific gravity and porosity of the construction body after drying for 4 hours.

According to the present invention, as shown in Table 1, the pouring time of the pouring material can be shortened to one-third of that of the conventional one, and even the completion of pouring from the middle frame set can be shortened to about one-half of the conventional one. The casting floor gutter is as durable as 25%. It was possible to extend the width.

Moreover, as shown in Table 2, the porosity of the construction body can be reduced by 5 to 6%, and the packing density is improved.

In the above embodiment, the kneading factory is provided apart from the construction site, but it may be installed in a place of an appropriate space by providing a dust prevention wall such as a partition wall, and the transport device is not limited to a truck. It is also possible to connect without a trolley, etc., further, as the casting object of the present invention is not limited to the blast furnace cast floor trough, it can be similarly applied to tundish or ladle of continuous casting equipment. is there.

Effects of the Invention As described above, in the present invention, a large amount of material is poured into a molten metal container such as a casting floor gutter of a blast furnace in a short time in a substantially continuous state so that heat curing does not occur, and the casting time In addition to being shortened, heat hardening can be delayed to improve the fluidity of the material, it is possible to prevent the formation of splice layers, cracks, cavities, etc., and it is possible to increase the specific gravity of the construction work and to prevent leak accidents. It is intended to prevent and extend the gutter life.
In addition, since the pouring material can be kneaded and prepared at a place other than the construction site, the capacity and number of mixers can be increased, the generation of dust at the pouring construction site can be prevented, and the working environment at the construction site can be improved. Kneading and preparation of materials can be performed quickly in parallel with on-site preparation work, and the work time in places where high heat is generated can be shortened, and the load of workers on high heat work can be reduced and equipment such as blast furnaces can be reduced. It has excellent effects such as improvement in productivity.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an embodiment of the present invention, and FIG. 2 is a side sectional view of the same as above in a pouring state. 1 …… Cast floor, 2 …… Blast furnace, 4 …… Casting material, 10 ……
Conveyor, 11 …… Bucket, 19 …… Segregation separation prevention plate.

Claims (2)

[Claims] 1. A non-standard refractory casting material is kneaded and prepared in a place different from a site for repairing a molten metal container such as a cast floor gutter of a blast furnace, and the kneaded and prepared casting material is stored in a large capacity of several tons. To be loaded into a bucket and transported to the repair site of the molten metal container, and to be poured into the molten metal container prepared for repair in a substantially continuous state so that the casting material loaded in the above-mentioned large capacity bucket will not be thermoset. A method for pouring a molten metal container characterized by the above. 2. A large-capacity bucket is provided with a material separation prevention plate such as a mesh plate for preventing segregation or sedimentation of the pouring material during transportation thereof. The method for pouring a molten metal container according to item 1 above.