Process for refusing slide gate plates and plate for this closur

Details Process for refusing slide gate plates and plate for this closur Process for refusing slide gate plates and plate for this closur

1997-08-23

1999-04-13

Kastler, Scott

Dispensing

Processes of dispensing

Molten metal

222600, 266236, 266DIG1, B22D 4128

Patent

active

058934928

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns a process for reusing slide gate plates for a metallurgical container, especially a steel making ladle. It also concerns a plate for this closure, and the closure itself.
To control the flow of molten steel through the bottom of a metallurgical container such as a steel making ladle, a slide closure is generally used. It involves an upper fixed refractory plate connected by a generally joint cemented to an internal nozzle located in the thickness of the refractory that covers the wall of the bottom of the metallurgical container, and a mobile lower plate connected to a collecting nozzle or to a jet protection tube, also through a generally cemented joint.
These plates wear rapidly such that it is necessary to replace them frequently. In order to reduce the cost of refractories per ton of steel cast, it is known to use the same plates several times, possibly after cleaning or reconditioning. For example, the patent Stopinc GB 2.625.928 accessorily describes a plate with two pouring holes, rectified on its two faces and equipped with a metal bandage. This plate is turned upside down and reused.
However, a problem that is posed in the familiar processes is that of human management. The operator does not know how many times the plates have been reused. The information should be stored; the history of the plates should be noted. This necessitates a monitoring of the plates, which is difficult. The efficacy of recycling is reduced.
Furthermore, a plate has been used has damaged zones, e.g., eroded and abraded zones. Its reuse introduces risks, e.g., of the infiltration of metal between the two plates. Reuse of the plates, advantageous in the sense that is lengthens the service life of the refractories, also involves the disadvantage of introducing risks.
The present invention proposes a process for reusing slide gate refractory plates, the closure having an upper indentation and a lower indentation for receiving a set of two refractory plates, each of these plates resting in an indentation through a face that becomes its support face and cooperating with the other plate through a face that becomes its sliding face.
This process permits a simple management of the plates and it also permits prolonging the service life of the refractories by reducing the risks associated with this prolongation.
It is characterized in that a set of refractories comprised of a new plate associated with a plate that has been used only once in the slide closure, and in that during the changing of the plates, the new plate is mounted in a lower or upper loading indentation, this indentation remaining the same for each plate change, the plate used once being mounted in the other indentation (recycling).
This process thus defines a charging indentation of new plates, always the same, and a charging indentation of plates used only once, also always the same. Thus, the management of the plates is simple. During a reconditioning of the slide gate the operator knows, in view of the indentation in which it was placed, which is used for the first time and which should be recycled, and which plate has been used for the second time and should be discarded.
The operator systematically discards the recycled plate and keeps the plate that has been used once in an appropriate place so that it can be recycled. He then systematically mounts a new plate in the charging indentation, always the same, of new plates and a recycled plate in the other indentation.
Furthermore, this process is very reliable. In effect set of two recycled plates is thus never used.
According to a preferred embodiment, the plate used once is placed in the recycling indentation such that the face that was its support face during its first application becomes its sliding face.
Depending on the casting mode used, it can be of interest to mount the new plate either in the upper position or in the lower one.
According to one embodiment, the new plate is mounted as the lower plate and the reused plate is the upper plate.
Thus, closure and regulation is a

REFERENCES:
patent: 4627147 (1986-12-01), Kagi
patent: 5174908 (1992-12-01), King et al.
patent: 5188743 (1993-02-01), King
patent: 5211857 (1993-05-01), Brinker

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