JPS6172691A - Lining material for molten metal vessel - 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 lining material for a molten metal container.

In tanditshu used in continuous steel casting,
A basic coating material is applied to the surface of the lining brick by applying it or spraying it to prevent contamination of steel, speed up tundish maintenance work such as bare metal removal work, m#! 4. Measures are taken to prevent the temperature from dropping and to prevent the backside bricks from seizing.

For this reason, attempts have been made to make the coating material lightweight and heat insulating, by adding inorganic or organic fibers or foaming agents.

However, when fibers and foaming agents are added, the porosity increases, the strength of the constructed body decreases, the amount of wear increases, and the slag components permeate through the continuous pores.
The problem arises that corrosion resistance is reduced by creating a low melting point material.

As a result of various studies in view of the problems of the prior art, the inventor of the present invention has found that by incorporating flaky mica into the coating material, it is possible to make the coating material lightweight and heat-insulating without reducing strength and corrosion resistance. I discovered that.

That is, in the present invention, flaky mica is contained in an amount of 1 to 10ffiffi%.
It relates to a lining material for a molten metal container characterized by containing:

The flaky mica used in the present invention is preferably a flaky mica with a particle size of about 1 to 10 ff and a thickness equal to or less than the particle size.
The types of minerals such as muscovite and biotite are not limited. Mica is effective in reducing the weight of the coating material, but it is not only a silica; it does not burn out when heated, so it can prevent a decline in corrosion resistance and strength, and when used in combination with a foaming agent, this effect can be enhanced. can be improved. That is,
By dividing the continuous pores created by the foaming agent with flaky mica, it is possible to create a coach ink material that is lighter and has less slag penetration and corrosion resistance. ■The amount of flaky mica used is 1 to 1% by weight of IO in the upholstery material. If the amount used is less than 1%, the weight reduction effect will not be achieved, and if used in combination with a foaming agent, the effect of blocking the communicating holes and preventing slag penetration will be small. If it exceeds 10 layers, the effect of heat insulation is sufficient, but it is not preferable because it may impair the corrosion resistance of the refractory aggregate. Furthermore, when the particle size of flaky mica exceeds 10ff, the workability gradually decreases, and 1
If it is smaller than ff, the effect of blocking the communicating holes will be reduced, which is not preferable. If the thickness is greater than 4 times the particle size, the orientation of mica will deteriorate and the effect of preventing slag penetration will be weakened, which is not preferable.

There are no particular restrictions on the type and amount of the large-sized resistant material and binder used in the present invention, and the types and amounts used are those normally used for molten metal containers. It is preferable to use magnesia raw material T- as a refractory material.

Specific examples of large-sized materials used in the present invention include Magineshi! Examples of the binder include condensed phosphate, condensed phosphate, etc.
Examples include silicates, borates, alumina cements, and the like.

Further, the foaming agent is used as necessary to further reduce the weight, and any foaming agent normally used for molten metal containers can be used to the extent normally used.

The lining material of the present invention is mixed with an appropriate amount of water and applied as a lining to a container for molten metal such as a tundish by troweling or the like.

Effects of the Invention The lining material of the present invention is a heat-insulating coating material with corrosion resistance, and since the components are not burned out by heating, there is no reduction in the strength of the constructed body.In addition, a foaming agent is used in combination. In some cases, the continuous vents can be divided by mica,
Furthermore, it can be made into a coated material that is lightweight and has excellent heat insulation properties.

Example Next, the present invention will be explained in more detail by showing examples.

Examples 1-4 and Comparative Example ■ Table 1 shows the formulations and physical properties of specimens prepared by adding water to the #1 basic tanditschcope ink material, kneading it, and casting it.

In addition, the coating materials of Example 2 and Comparative Example i were applied to a tundish to a thickness of approximately 15 fl, and the results of rapid heating at 900°C 1.5 hours after application and the state after 6 charges were compared to the second table. Shown in the table.

*Erosion test 0-e/x-〇, 4 using a tarry set slack test machine
The test was carried out at 1,550°C for 3 hours using a slag of 1,550°C. After the test, the melting thickness fi) and the slag penetration thickness ff) were measured, and expressed as an index when the melting thickness and penetration thickness of the comparative example were taken as 100.

Tables 2 and 1 It is clear from Table 1 that Examples 2 and 3 are lighter and have better heat insulation properties, as well as superior strength and corrosion resistance, compared to the comparative example. In addition, the practical example 1 has good bending strength and corrosion resistance, and the example now has excellent lightweight heat insulation properties, and it is clear that it has a strength of 66. These are the results when used, and it can be seen that both the inventive product and the comparative example are in good condition after rapid heating, with no cracks, bulges, or peeling. After 6 charges, most of the slag lines in the comparative example had molecular B loss, but in the products of the present invention, almost no melting loss was observed in the slag lines, and improvement in corrosion resistance was observed. In addition, there was less penetration of slag than in the comparative example, less burning with backside bricks, and a very good demolition work ratio.

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Claims (1)

[Claims] (1) A lining material for a molten metal container characterized by containing 1 to 10% by weight of flaky mica.