JPH06219830A - Non-fired brick for aluminum melting converter - Google Patents

Abstract

PURPOSE:To obtain a zircon non-fired brick for lining aluminum melting converter by adding borax and a binder into zircon containing silica rock and a binder clay, kneading, molding and drying. CONSTITUTION:The non-fired brick for lining aluminum melting converter is obtained by adding 3-5wt.% borax and the binder into 100wt.% composition containing 2 85wt.% zircon, 5-1wt.% silica rock and balance the binder clay in external multiplication, kneading, compacting and drying. The non-fired brick is of a vibration and flowed-in type adapted also for a type for constructing the aluminum melting converter by directly vibrating and flowed-in compacting. When the zircon-borax based non-fired brick is applied to the inside of the aluminum melting converter, any damage is not generated even in six months and the service life is prolonged compared with the conventional high alumina material or alumina material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zircon unfired brick for lining an aluminum melting furnace.

[0002]

2. Description of the Related Art Since slag for a furnace material for lining an aluminum melting furnace is inactive, its erosion action is relatively slow. However, since the molten metal having a low viscosity penetrates into the pores and causes structural spalling during long-term use, a well-tempered product is required. Generally, high alumina bricks or alumina bricks are used. In order to prevent the infiltration of metallic aluminum, these materials use a technique of using phosphate and borate in combination to make the pores finer, but all of them have been fired at a high temperature to obtain predetermined characteristics. .

[0003]

SUMMARY OF THE INVENTION The present invention, however, is directed to a non-fired brick as opposed to a conventional fired alumina brick.

[0004]

[Means for Solving the Problems] That is, the present invention contains 85% by weight or more of zircon and 5 to 10% by weight of silica stone,
With respect to 100% of the composition of which the balance is binder clay, 3-5 wt% of borax is added as an outer cover, and a binder is kneaded, molded, and dried. Of 50% by weight or more, 50% by weight or less of the coarse angle of zircon is replaced with at least one kind of alumina or mullite, and 5 to 10% by weight of silica is contained.
This is an unfired brick for an aluminum melting furnace, which is obtained by adding 3 to 5% by weight of borax as an outer cover, a binder, and kneading, molding, and drying the composition, the balance of which is composed of binder clay.

When a zircon material used for a molten steel ladle or the like is used for lining an aluminum melting furnace, it has been found that it has excellent corrosion resistance. Zircon materials are either fired or unfired in the manufacturing of bricks, and both have excellent or superior results compared to the current high alumina materials or alumina materials. Among them, the non-fired brick has characteristics such as a short manufacturing period, excellent shape accuracy, and excellent spalling resistance, and is suitable for lining in an aluminum melting furnace.

The basic composition of unfired zircon bricks is that if the zircon content is not less than 85% by weight, corrosion resistance cannot be obtained, and the coarse grain part has a zircon coarse angle of 35% by weight to 45% for the purpose of closest packing. %, The zircon sand in the range of 15% by weight to 25% by weight, the zircon flour in the range of 25% by weight to 35% by weight, and the expansive silica stone in an amount of 5% by weight to prevent joint wear. % To 10% by weight. If the silica content is less than 5% by weight, the effect against joint wear is not exhibited, and if it is more than 10% by weight, cracks are generated in the brick, which is not preferable. 1 to 4% by weight of binder clay is used as the plastic material, and water glass and phosphate are used as the binder. Water is 100% refractory composition if necessary
5% by weight or less is used. In the coarse-grained portion, less than 50% by weight of the amount of zircon coarse angle used is alumina with few pores,
It is possible to substitute and use one or more types of mullite.

Therefore, the present invention aims to further improve the zircon material for lining an aluminum melting furnace, and as a method of further preventing the penetration of a molten metal having a low viscosity, which is a necessary characteristic, by adding basic unfired zircon bricks, Table 1 shows the results of investigation of permeation resistance by adding Cerdian and borax, and it was found that borax addition was an effective means.

Borax transforms into an anhydrous material at 350 to 400 ° C., and then melts at 878 ° C. to become glassy, which prevents the infiltration of molten metal aluminum due to the effect of blocking the pores of the brick. As the amount of borax added, the minimum amount required to close the brick pores is appropriate, and the amount is 3 to 5
% By weight. If it is 3% by weight or less, there is no effect of preventing intrusion, and if it is 6% by weight or more, the boric acid-based glass produced rather tends to flow out along with the base material zircon and the damage tends to be large. The results are shown in Table 1. .

[0009]

[Table 1]

[0010]

EXAMPLE An unfired zircon brick was prepared from the raw materials and blending ratios shown in Table 2 and their properties were compared. The results are shown in Table 2.

[0011]

[Table 2]

Although the pressure-molded unfired brick has been described above, the present invention is also applicable to a vibration-and-cast type unfired brick or a type that is constructed by directly vibrating and casting in an aluminum melting furnace.

[0013]

EFFECTS OF THE INVENTION Based on these results, as a result of practical use of zircon-borax-based unfired brick for lining of aluminum melting furnace,
No damage was observed even after 6 months, which contributes to the extension of the life of the furnace compared to the current high alumina material or alumina material.

Claims (2)

[Claims] 1. Zircon is 85% by weight or more and silica stone is 5 to 5.
Non-sintering for aluminum melting furnace, which is obtained by kneading, molding, and drying by adding 3 to 5% by weight of borax as an outer cover and a binder to 100% of a composition containing 10% by weight and the remainder being binder clay. Brick. 2. A zircon containing 85% by weight or more, in which 50% by weight or less of the amount of coarse angle of zircon is replaced with at least one kind of alumina or mullite, and 5 to 10% by weight of silica, and the balance. 100% composition of which is binder clay
On the other hand, an unfired brick for an aluminum melting furnace, which is obtained by adding 3 to 5% by weight of borax and a binder as an outer coat, kneading, molding and drying.