JPS62252885A - Molten-metal vessel flow-in execution method - 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 Field of the Invention The present invention relates to a method for pouring into a molten metal container such as a cast bed trough of a blast furnace.

BACKGROUND OF THE INVENTION In recent years, the repair of cast floor gutters and the like of blast furnaces has begun to be carried out by pouring monolithic refractories, instead of the conventional lining with firebrick or the like. Therefore, a mixer is installed on the side of the cast bed gutter.
The work of installing a cross-conductor, etc., cross-conducts the required monolithic refractory material, and pours it into the cast bed gutter is becoming more common.

Problems to be Solved by the Invention However, in small and medium-sized blast furnaces, etc., the casting bed in front of the furnace is narrow, making it difficult to carry mixers and kneading devices in and out, and the capacity and number of these devices are limited. However, there are limits to pouring material into the gutter in a continuous manner in a large amount in a short period of time, and it is difficult to continuously pour a large amount of pouring material into the gutter. Each crosstalk had to be prepared and poured one after another, which took a long time. For this reason, in cast floor troughs and other facilities that handle molten metal in blast furnaces, etc., the poured material hardens quickly due to high heat, resulting in poor fluidity of the material, resulting in a construction with many pores and cracks, cracks, and cavities. This was the cause of pig iron residue accidents and reduced gutter life. Furthermore, dust from the kneading work, water vapor, powder smoke, etc. from the poured materials were generated, resulting in an unfavorable working environment, and the burden of long hours of high-temperature work was harsh on the workers.

Means for Solving the Problems The present invention was developed in view of the above-mentioned problems, and it is a method of mixing monolithic refractory pouring material at a location other than the repair site of a molten metal container such as a blast furnace casting bed gutter. The prepared and kneaded pouring material is loaded into a large-capacity bucket of approximately several tons and transported to the repair site of the molten metal container, and the molten metal container prepared for repair is poured into the large-capacity bucket. By pouring and loading the material in a nearly continuous state to prevent heat curing, a large amount of the poured material can be poured in a near continuous state in a short period of time, and the heat hardening of the poured material can be delayed, making it possible to create pouring layers, cavities, etc. We have developed a molten metal container pouring construction method that can prevent the occurrence of residual pig iron accidents on construction objects, extend the life of the gutter, reduce the burden of long-term high-temperature work, and improve the working environment. It is on offer.

Example Hereinafter, the present invention will be explained based on examples.

FIGS. 1 and 2 show an embodiment of the present invention, which is applied to a blast furnace casting bed trough. The cast bed 1 is installed in the lower part of the blast furnace 2 as shown in FIG. A cast bed hM6, which is a molten metal container having a lining fireproof wall 5 therein, is loaded with a pouring material 4 prepared by kneading and preparing a silicon carbide-carbon based amorphous refractory material, etc.
The hot metal tapped from the torpedo car 7 is stored and can flow freely to the torpedo car 7 as needed.

As shown in FIG. 1, a jib crane 8 and an overhead running lane 9 are installed above the cast bed gutter 6, which is the molten metal container. A large-capacity bucket 11 loaded with about 5 tons of pouring material 4 is suspended and conveyed freely, and the pouring material 4 is sequentially and almost continuously poured into the casting bed gutter 6 as shown in FIG. 2. The above-mentioned poured material 4 is poured into a mixing factory 12, which is located at a different location from the casting bed 1 and a little away from the casting bed 1, as shown in Fig. 1.
Kneaded and prepared. The kneading factory 12 has a mixer 13 with a capacity of 1 to 2M, which is several times larger than the conventional one, as shown in the figure.
A plurality of units are installed, and the above-mentioned amorphous refractory powder material is mixed in a short time with a large-capacity mixer 13, and is sequentially loaded into the above-mentioned bucket 11 via a conveyor 14 such as an overhead crane to form a conveyor bag ff1F10. The cast iron is conveyed to one part of the cast bed in accordance with the repair process, and poured into the cast floor gutter 6 for repair. In addition, the above-mentioned large-capacity bucket 11 is installed on a holding frame 17 for preventing floating of the middle frame, which is provided with legs 15 on the outer periphery and installed on the middle frame fixing part 16 of the cast bed 1, as shown in FIG. In addition, a hanging part 18 is provided on the upper part to allow the hanging part to be freely hung, and an IM is installed inside.
Segregation prevention plates 19, such as mesh plates, are installed at appropriate positions in the center and sides to prevent the poured material 4 from segregation, sedimentation, and separation during transport. It is. 20 is a bucket discharge valve, 21 is a discharge port, 22
is the middle frame.

When repairing the inner refractory wall 5 of the cast bed gutter 6 of the blast furnace 2, the worn inner refractory wall 5 should be repaired according to the process chart.
The gutter inner frame 22 is disassembled and the dismantled waste is discharged, and the gutter inner frame 22 is placed on the holding frame 17 for preventing floating of the inner frame installed on the inner frame fixing part 16 at the upper part of the cast floor gutter 6, as shown in FIG. Prepare for pouring. On the other hand, in parallel with the above preparatory work, as shown in FIG.
is prepared, loaded into a plurality of required large-capacity buckets 11, and transported to one part of the casting bed using a one-rack transport device 10 in accordance with the work plan.

In this way, while work such as dismantling the inner fireproof wall and installing the inner frame is carried out in the high-temperature casting bed as in the past, the pouring material is mixed and prepared in a separate location at the same time. It prevents dust from being generated in the casting bed, improves the working environment at the construction site, and improves the working environment at the construction site. In particular, since there are few restrictions on space and the required space can be secured, a plurality of large mixers can be installed and a large amount of pouring material can be mixed in a short period of time. Then, it is loaded into a large-capacity bucket and ready for pouring according to the process of preparing the casting bed gutter.
This will help shorten the construction work.

In addition, the bucket is equipped with a segregation prevention plate, so even if poured material is loaded and transported, it will prevent the material from segregating or settling and separating, making it easier to use at the construction site. It is possible to maintain the same quality as in kneading preparation.

Then, as shown in FIG. 2, the bucket 11 that is waiting to be carried in is transported and installed via the overhead crane 9 or jib crane 8 to the pouring part of the cast bed gutter 6 that has been prepared for pouring, and the bucket I&L outlet valve 20 is opened. When the discharge port 21 is opened, the pouring material 4 flows into the inside of the outer firewall 3 surrounded by the gutter frame 22 as shown in the figure, forming the inner fireproof wall 5. . Once the pouring material 4 has finished flowing into the bucket 11 of (2), the bucket 1 that was waiting to be carried in the same way
1 is sequentially transported, loaded in a required amount, and dried and cured at a predetermined temperature for repair.

In this way, large capacity buckets of 2 to 5 tons are used to pour in the pouring material, so it is possible to pour in and load a large amount of material in a short time by pouring with the bucket several times, and it is almost continuous. It is possible to flow the pouring material, delay thermosetting of the pouring material, and uniformly charge the pouring material inside with good fluidity. Therefore, it is possible to prevent a pouring layer from forming between the pouring material and the generation of cracks, cavities, etc., and to form a construction body with a high packing density and few pores.

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

Table 1 shows the construction status of construction according to the present invention and conventional construction, and Table 2 shows the construction status of the construction according to the present invention and the conventional construction.
, concerning the specific gravity and porosity of the constructed body after drying for 24 hours.

In the present invention, as shown in Table 1, the time for pouring the pouring material can be reduced to one-third of the conventional method, and the time from setting the inner frame to completing the pouring can be reduced to approximately one-half of the conventional method. The durability of the cast floor gutter was also increased by 25% compared to Table 1, Table 2.

Furthermore, as shown in Table 2, the porosity of the constructed body was also reduced by 5 to 6%, and the filling density was improved.

In the above embodiment, the kneading factory was set up away from the construction site, but a dust prevention wall such as a partition wall may be installed adjacently in an appropriate space. Furthermore, the pouring object of the present invention is not limited to blast furnace cast bed troughs, but can also be applied to tundishes, ladles, etc. of continuous casting equipment. It is.

Effects of the Invention As described above, in the present invention, a large amount of material can be poured in a short period of time in an almost continuous state to prevent thermosetting by pouring the material into a molten fully bent container such as a cast bed gutter of a blast furnace, and the pouring time can be reduced. In addition to reducing heat hardening, it is possible to improve the fluidity of the material, prevent the occurrence of pouring layers, cracks, cavities, etc., and increase the specific gravity of the construction body, reducing the risk of residual iron accidents. It is possible to prevent this and extend the life of the gutter.

In addition, since pouring materials can be mixed and prepared outside of the construction site, the capacity and number of mixers can be increased, and the generation of dust at the pouring construction site can be prevented. It is possible to quickly mix and prepare materials in parallel with on-site preparation work, reduce work time in areas where high heat is generated, and reduce the burden of high-heat work on workers. It has excellent effects such as improved productivity.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of one embodiment of the present invention, and FIG. 2 is a side sectional view of the same in the pouring state. 1... Casthouse, 2... Blast furnace, 4... Pouring material,
10...1 general feeder, 11...bucket, 19...
- Segregation prevention plate. Applicant Kawasaki Rozai Co., Ltd. Agent Patent Attorney Kuniaki Morimoto'JS + 7: :: 2:, 1

Claims (2)

[Claims] (1) Amorphous refractory pouring material is mixed and mixed at a location other than the repair site for molten metal containers such as blast furnace casthouse gutters, and the mixed and prepared pouring material is poured into a large-capacity bucket of several tons. Loaded and transported to the repair site of the molten metal container,
A molten metal container pouring construction method characterized in that the pouring material loaded in the large-capacity bucket is poured into the molten metal container prepared for repair in a substantially continuous state so as not to cause thermal hardening. (2) The scope of the claim is that the large-capacity bucket is equipped with a material separation prevention plate such as a steel plate in order to prevent the poured material from separating due to segregation or sedimentation during transportation. The molten metal container pouring construction method according to item 1.