The Use Of Amorphous Refractories On Ladles

Firebrick for steel ladle

About The Ladle

1. Main Use

A ladle refining furnace can be used for steel refining in primary furnaces (electric arc furnace, flat furnace, converter), and is important metallurgical equipment to meet continuous casting and rolling.

2. Equipment Features

Equipment with atmospheric arc heating, vacuum degassing, blowing argon stirring, blowing oxygen feeding wire, atmospheric pressure or vacuum charging, temperature measurement, sampling, TV camera, frequency observation, and other functions.

The introduction of amorphous refractory casting construction technology

As a construction method for ladle bottom and ladle wall of amorphous refractories, the most common pouring construction method was introduced at first.

2.1 Pouring Construction

Pouring construction method

First, natural maintenance is carried out for about half a day after the ladle bottom is constructed.

Then, the frame and mixing mixer is installed, and after pouring the resistant material, to fill the entire gap evenly, a stick vibrator is used to help vibrate.

After about half a day of natural maintenance for demoulding, then the construction of refractory brick masonry is carried out for the slag line part.

Firebrick produced with magnesia-alumina

2.2 Selection Of Pouring Material

For the properties of refractory materials used in the bottom and wall of the package, it is required not only to have good corrosion and slag resistance but also to have a stable structure.

It is generally considered that magnesia-alumina refractory bricks are required to meet the above conditions.

When the amount of MgO in MgAl refractories is in the range of 7-28%, a dense and stable spinel solid solution is formed. Therefore, it is generally used as a refractory material for steelmaking ladles.

PER refractory plants attach importance to cost reduction, improvement of abrasion resistance in the steel impact section, and the effect of residual expansion and therefore use Magnesia Alumina refractory materials as castables.

In addition, even when the thickness of the long construction body is thin (up to 40 mm), the flowability of the castable is ensured.

Therefore, the particle size of Al2O3 aggregate was set at 8 mm or less, and metallic Al was added as a measure to prevent bursting during drying.

2.3 Results Of Practical Application

The rate of melt loss was investigated for the uppermost part of the ladle wall of a 15t ladle.

Compared to refractory bricks, the maximum rate of melt loss in all parts of the castable was 0.4 mm/furnace, while the repair cycle of the slagline bricks (about 40 furnaces of steel) was carried out only when the melt loss of the bricks reached about 16 mm. Thus, there is no adverse effect on the ladle life.

In addition, the working surface can be repaired after use by removing the adhering metal and cleaning the surface in several ways, as long as the working surface is not completely molten.

This reduces the amount of refractory material used in the construction of new spraying and reduces the waste bricks produced by the ladle by about 30%.

2.4 Expanding The Topic Of Definition Of Technology

Although it is known that the casting material has no problem in terms of durability, it is necessary to reduce the overall cost of the refractory. However, in order to reduce the overall cost of steelmaking refractories, it is necessary to expand the application of the information technology to other refractory bodies (e.g., 25t ladles, VLF ladles, steel discharge chutes, etc.).

About PER Refractory Groups

PER Refractories’ products are made of green, energy-saving, and environment-friendly refractory materials.
We produce clay insulation bricks, corundum lightweight bricks, chrome corundum bricks, corundum mullite bricks, sintered mullite bricks, sintered magnesia bricks, magnesia alumina bricks, carbon bricks, silica bricks, alumina hollow bricks, high alumina bricks, clay bricks, and other products. You can contact us at any time to get the price of refractory bricks below the market price.

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