LU83175A1 - PROCESS FOR DETERMINING THE LEVEL OF METAL IN A METALLURGICAL CONTAINER SUCH AS A POCKET-TORPEDO AND POCHE-TORPILLE FOR IMPLEMENTING THE PROCESS - Google Patents

Description

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'METALLURGICAL RESEARCH CENTER -CENTRUM VOOR RESEARCH IN DE METALLURGIE,

Non-profit association - vereniging zonder winstoogmerk in BRUXELLES, (Belgium).

Method for determining the level of metal in a metallurgical container such as a torpedo bag and torpedo bag for carrying out the method.

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The present invention relates to a method for determining the level of liquid metal in a metallurgical container, and especially the level of pig iron in a torpedo bag, or in a similar container (for example a pig iron mixer).

Knowledge of the level of liquid metal in a metallurgical vessel is a given which is of considerable importance. Too low, this level corresponds to / insufficient filling of the container, which reduces the /// ψ I / 2.- * \ productivity of this metal processing phase, too high, it compromises the safety of personnel and overloading the devices responsible for handling the container in question.

When the level of the metal in a container can be easily determined, for example by direct vision in said container, the problem posed is easily solvable, and does not give rise to any particular difficulty. This is not the case even when the container is closed or almost closed, not suitable for direct observation or weighing.

A method of determining the level of liquid metal in a static oven is already known, according to which, approximately at the maximum level that can be admitted for the metal in the said oven, one or more thermocouples have been inserted into the wall of the oven. which inform the operator when the liquid metal reaches their level.

In the case where the metallurgical container is a torpedo bag, such a device seems difficult to use, in particular because of the presence of slag on the metal, slag which constitutes a thermal barrier making the correct operation of such thermocouples uncertain.

Added to this is that in a torpedo pocket, the interior is difficult to access for direct inspection or easy repair and that, moreover, when one begins to fill it, one does not know exactly the quantity of cast iron which remains. possibly in its bottom, nor its exact capacity depending on the level of the metal.

The subject of the present invention is in particular a method by which the drawbacks mentioned above can easily be remedied.

The process which is the subject of the present invention is essentially characterized in that, making use of a torpedo bag, the internal refractory lining of which is provided at least in one place, with a series of bricks electrically reductant and electrically isolated, interesting 1'encombremenby / 3.- t 'i! vertical of the said coating, the said pocket is filled with a cast iron which, when it comes into contact with each brick, closes an electric fired cir-j comprising both the said cast iron and the brick | .'correspondante, in that we control the filling of the pocket j through the observation of successive signals "caused by the successive closure of each circuit corresponding to each brick and in that we react, appropriately, to the appearance of signals corresponding to the brick of the highest level or in the absence of one of the expected signals, for example by stopping the j> filling of the bag.

The present invention also relates to a torpedo bag provided with a device which makes it possible to easily determine the level of the metal in such a pocket, at the time of filling.

The device with which such a torpedo bag is provided essentially consists in the fact that in at least one place of its internal refractory lining and preferably substantially along the vertical (the pocket being in the filling position), the said internal coating comprises a series of electrically conductive refractory bricks, electrically isolated from one another and arranged in successive different levels, each of these bricks forming part of an 'adequate electrical circuit, which can be specific to each brick, so that the filling progressive of - almost the entire internal volume of the pocket can be controlled by electrical signals successively coming from each of said electrical circuits.

Indeed, during the filling of the pocket, the cast iron which comes into contact successively with each conductive brick closes the appropriate electrical circuit corresponding to | the brick considered. This closure can be effected in particular by contacting the cast iron with an electrically conductive refractory brick, present in the bottom of the torpedo bag,.

itself forming part of the appropriate circuit or circuits considered. / 4.-.

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We can therefore be instantly notified of the level reached by the iron in the pocket and follow the rise of this level brick by brick.

Knowing by calculation, the approximate time that the upper level of cast iron can take to go from one brick to the next for a given flow range, the operator is. warned of the progress of filling the bag.

The absence of a signal relating to a brick, at the „when it should normally occur, indicates to the attendant either that an untimely interruption in the filling of the pocket has occurred, which he can easily check, either the corresponding brick is destroyed or masked by an undesirable layer of non-electrically conductive slag. He can still, at this time, interrupt the filling of the bag before overflowing and have the necessary repair considered.

Different materials can be envisaged to constitute the conductive bricks considered, among which one can choose with advantage, either graphite, or carbide / silicon. //.

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Claims (4)

5.- “j! ? * 1. Method characterized in that use is made of a torpedo pochè whose internal refractory lining is provided at least in one place with a series of electrically conductive and electrically insulated bricks, concerning the vertical size of said coating , the said pocket is filled with a cast iron which, at the time of its contact with each brick, closes an electrical circuit comprising both the said cast iron and the corresponding brick, in that the filling of the | pocket thanks to the observation of successive signals caused by the successive closure of each circuit corresponding to each brick, and in that one reacts in an appropriate manner to the appearance of the signal corresponding to the brick of the highest level or in the event of absence of one of the expected signals, for example by stopping the filling of the bag. 2. torpedo bag or similar container intended to be filled with liquid cast iron, in accordance with the method of claim 1, characterized in that at least in one place of its internal refractory lining, and preferably substantially along the vertical (the pocket being in the filling position, said internal coating comprises a series of electrically conductive refractory bricks, but electrically insulated! All of each other, each arranged in a different level! - ferent coating, so that the cast iron, during its filling of the pocket successively reaches each of the j bricks of the said series, and preferably only one at a time, | the said briqû'es forming part of an adequate circuit, being able to be specific to each brick, and closed at the moment of contact of the cast iron with the corresponding brick. / // l · \ *. V 6 · “ 3. torpedo porch characterized in that in the bottom of the torpedo pocket is an electrically conductive refractory brick, forming part of each of the electrical circuits relating to the other bricks, the successive closing of each of said circuits being by melting itself, during the filling of the pocket. 4. Torpedo bag according to one or the other. t \ claims 2 and 3, characterized in that the bricks con-. ductrices are made of graphite or silicon carbide. ; nc; . ___ p'enches ~ "x r. ^ 3 d? carde——y ~ ^ ijl · .--. s, -j description Z r„ '.a Claims y description Luxerftbci-'r ^. ^ e Chr.:1cs l · '--.-? 1 "· 1 A.. * "'." ‘Kt'Ali. ·. .