Method for forming a lining on a metallurgical vessel, a composi

Details Method for forming a lining on a metallurgical vessel, a composi Method for forming a lining on a metallurgical vessel, a composi

1991-01-14

1993-01-05

Kastler, Scott

Metallurgical apparatus

Process

266281, C21B 1300

Patent

active

051768739

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The present invention relates to a method for forming a lining on the internal faces of a metallurgical vessel such as a tundish or a casting ladle in order to protect the vessel wall or its permanent refractory lining.
The invention is also directed to the composition used to form the lining aforesaid.
The invention is also concerned with a machine for carrying out the method aforesaid.


BACKGROUND OF THE INVENTION

In the majority of instances, the protective lining considered in the foregoing is currently applied on the internal faces of a metallurgical vessel by spraying a slurry consisting of a mixture of refractory materials, fibers and a binder.
This method proves wholly satisfactory but suffers from the disadvantage of covering the internal faces of the vessel with a lining containing a considerable quantity of water which has to be subsequently eliminated by means of a long and costly drying operation.
There is also known a method which consists in pouring the lining composition into the space located between the internal faces of a metallurgical vessel and a mold of substantial size which is placed within this latter.
This mold is equipped with preheating means and valves through which air is permitted to escape while the composition is being blown into the space mentioned above.
The use of a mold of this type is not only complicated and costly but also results in excessive consumption of composition in order to form the lining since the walls of the mold are smooth whilst those of the permanent lining have hollows and bumps, especially when it is worn.
The aim of the present invention is to overcome the disadvantages of known methods.


SUMMARY OF THE INVENTION

In accordance with the invention, the method for forming a lining on the internal faces of a metallurgical vessel which is intended to receive molten metal essentially involves the following steps: the internal face of said vessel; introduced between the internal face of the vessel and the movable wall; surface which is intended to come into contact with the molten steel; so as to obtain a continuous lining on the internal faces of the vessel.
A movable wall of this type is much simpler and less costly to construct than the molds of large size which have been employed up to the present time.
Moreover, this movable wall can be displaced by making use of means which develop low power and therefore achieve an economy of energy.
Moreover, said movable wall makes it possible to check the thickness of the lining with accuracy while thus preventing any overthickness and any wasteful consumption of the initial composition.
In accordance with an advantageous embodiment of the invention, the powdered composition is introduced either by hand between said internal face and said movable wall or by means of a device for providing a constant supply between said face and said wall as the movable wall advances.
In accordance with a preferred embodiment of the invention, heating of the powdered material is carried out by preheating said internal face and/or said movable wall to the vicinity of 190.degree. C. to 500.degree. C. in the case of practically dry compositions, then to 900.degree. C. if the composition contains water of crystallization or of rehydration or if decarbonation of certain refractory materials is necessary.
Preferably, said powdered refractory material is selected from the following materials: silica, alumina, magnesia, chrome-magnesia, raw dolomite, baked dolomite, calcite, lime, chromium oxide, zirconium silicate, alumino-silicates and their mixtures.
The composition can contain in addition a binder selected from the mineral, organic, hydraulic binders and their mixtures.
According to another aspect of the invention, the machine for carrying out the method in accordance with the invention comprises at least one movable wall which is capable of displacement along an internal face of the vessel and forms with said face a space of substantially constant thickness corresponding to that of the lining to be formed

REFERENCES:
patent: 3876354 (1975-04-01), Kuita et al.
patent: 4117052 (1978-09-01), Florian
patent: 4218050 (1980-08-01), Egli et al.
patent: 4589633 (1986-05-01), Gilson et al.

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