JPH0614931Y2 - Ladle general wall structure - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a general wall structure of a ladle for carrying and various treatments of molten metal, particularly a ladle for secondary refining. In the present specification, the term "general wall" refers to a side wall portion of a ladle located below a slag line when a predetermined amount of molten metal is contained in the ladle.

2. Description of the Related Art As shown in FIG. 1, the structure of a general wall of a ladle is such that an inner lining 2 that directly contacts the molten metal 1, a lining 3 provided on the outer side of the inner lining, and a steel skin provided on the outermost side. 4 and.
The lining 2 and the lining 3 are made of heat-resistant and highly corrosion-resistant bricks, but the lining 2 is exposed to severe conditions and is consumed a lot, so it is necessary to replace the lining 2 within a certain period. When relining the lining, in order to make the work easier and reduce the cost of relining, etc., the inner lining is usually removed before the lining is consumed to reach the inner side of the lining. It is lined with bricks. Unfired magnesia / carbonaceous bricks, unfired alumina / magnesia / carbonaceous bricks, unfired high-alumina bricks, etc. are generally used as bricks for lining the general wall of the secondary refining ladle. High-alumina bricks are widely used as building bricks.

[Problems to be solved by the device]

However, when the inner lining is made of unburned magnesia / carbonaceous bricks and the backing is made of high-alumina bricks, the heat of the molten metal transmitted through the lining causes the two bricks to react, or is pressed for the pressure of the molten metal, The so-called burning phenomenon easily occurs. When the seizure phenomenon occurs, it takes time and effort to remove the inner lining, and it causes the life of the lining to be shortened. Therefore, an object of the present invention is to provide a general wall structure of a ladle in which the lining of unfired magnesia-carbonaceous bricks can be easily disassembled.

[Means and actions for solving the problem]

The general wall structure of the ladle according to the present invention will be described with reference to the reference numeral in FIG. 1. As a lining 3 which is in direct contact with the lining 2 made of unburned magnesia-carbonaceous brick, unfired alumina-magnesia-carbonaceous brick is used. It is characterized by using. According to the general wall structure of the present invention as described above, seizure between the lining 2 and the backing 3 is reduced as compared with the conventional structure, and as a result, the lining 2 can be easily disassembled and removed. . The unburned alumina / magnesia / carbonaceous brick used as the backing 3 in the present invention is not limited in its manufacturing method. For example, the fused magnesia clinker or the sintered magnesia clinker 30% and fused alumina are used. It is obtained by adding 4% of a phenol resin to 60% of clinker or bauxite and 8% of natural scaly graphite, kneading and molding by a general method, and then drying. Further, the manufacturing method of the unburned magnesia-carbonaceous brick used as the lining 2 in the present invention is not limited in any way. For example, 85% of fused magnesia clinker or seawater magnesia clinker and natural scaly graphite 1
It is obtained by adding 4% of phenol resin to 5%, kneading and molding by a general method, and then drying. In addition, in the general wall structure of the ladle shown in FIG. 1, the backing 3 is shown as one layer, but it may be provided as a structure in which it is laminated in multiple layers. For example, as shown in FIG. 2, the backing layer 3 may include an inner layer 3a, an intermediate layer 3b, and an outer layer 3c.
It is also possible to divide the inner layer 3a into a non-sintered alumina / magnesia / carbonaceous brick, the intermediate layer 3b into a low stone brick, and the outer layer 3c into a heat insulating material. However, even in this case, it is necessary to use unfired alumina / magnesia / carbonaceous brick for the inner layer 3a of the lining which is in direct contact with the lining 2.

【Example】

Next, examples of the present invention and comparative examples will be shown. Example A general wall of a 70 ton LF pot was lined with a 150 mm thick lining using unburned magnesia-carbonaceous brick. The inner layer of the lining which is in direct contact with this inner lining is made of unburned alumina / magnesia / carbonaceous brick 65 mm, and the low stone brick 30 mm is arranged on the outside of the lining, and a 13 mm heat insulating material is interposed between the brick and the iron skin. . After refining 65 times at a molten steel temperature of 1650 ° C, the lining was disassembled. At this time, the remaining thickness of the lining brick was 40 to 50 mm. Dismantling was performed by one worker using an air picker. There was almost no baking phenomenon between the unburned magnesia / carbonaceous brick as the lining and the unburned alumina / magnesia / carbonaceous brick as the lining, and the dismantling work was completed in about 1 hour. Also, since the impact on the lining was small during the dismantling work, no damage to the lining brick was observed during this dismantling. Comparative Example Using an LF pan having the same general wall structure as in the example except that the inner layer of the lining was made of high-alumina brick 65 mm, and refining 65 times at a molten steel temperature of 1650 ° C. in the same manner as in the example,
The lining was dismantled. At this time, the remaining thickness of the lining brick was 40 to 50 mm. Dismantling is the same worker as in the example 1
I used an air picker with the same name. The area ratio of unburned magnesia carbonaceous brick, which is the lining, and high alumina brick, which is the lining, is about 30.
% It was burned in, and it took about 8 hours to disassemble it. Moreover, since the lining brick was damaged during dismantling, it was necessary to repair it locally.

[Effect of device]

As can be seen from the above description, according to the general wall structure of the ladle of the present invention, the inner wall is lined with the conventional unburned magnesia / carbonaceous brick lining and the high-alumina brick lining. There is little seizure of bricks and lining bricks, and the dismantling time can be shortened to about 20% of the conventional one. In addition, since there is little impact on the lining during dismantling work, the life of the lining can be expected to be extended, and it is of great practical value as a ladle lining structure.

[Brief description of drawings]

FIG. 1 is a sectional view of a general wall structure of a ladle, and FIG. 2 is a sectional view showing another embodiment of the general wall structure of a ladle. 1 ... Molten metal, 2 ... Lining, 3 ... Lining, 3a ... Lining inner layer, 4 ... Iron skin.

Claims (1)

[Scope of utility model registration request] 1. In a general wall structure of a ladle consisting of an inner lining and a lining, the inner lining is made of unburned magnesia-carbonaceous brick, and the lining directly contacting this lining is made of unburned alumina-magnesia-carbonaceous brick. The general wall structure of a ladle characterized by this.