DE8633343U1 - Device for introducing powdered reagents into a melting pan - Google Patents

Abstract

1. Device for introducing powdered reagents into a torpedo ladle (1), containing a lance (2) which is arranged approximately vertically in the torpedo ladle, serves for the pneumatic delivery of the reagents, and at its end which is located in the melt (2) is provided with two outlet nozzles (4, 5) which are arranged approximately horizontally and point in opposite directions, characterised in that the outlet nozzles (4, 5) are rotated by a fixed angle (alpha) between 30 degrees and 60 degrees, preferably approximately 45 degrees, with respect to the longitudinal axis (6) of the torpedo melting ladle (1).

Description

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P6295

Device for introducing powdered reagents into a melting pan

The innovation relates to a device (according to the preamble of claim 1) for introducing powdered reagents into a melting pan.

When treating a melt with injected powdered reagents, for example when desulfurizing pig iron with a calcium carbide mixture, it is important to add the reagents in such a way that the best possible utilization of the reagents in the melt is achieved.

Until now, powdered reagents have been introduced into a melting pan using a straight lance that is inclined at an angle of 10° to 30° from the vertical and has an outlet opening at its end in the melt through which the reagents are blown into the melt approximately parallel to the lance axis.

In this known design, the reagents emerging from the end of the lance initially only reach one half of the reaction chamber due to the inclination of the lance. Complete distribution and homogenization over the entire reaction chamber is only achieved after a relatively long mixing or homogenization time, which impairs the metallurgical utilization of the reagents.

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The innovation is therefore based on the task of designing a device according to the preamble of claim 1 in such a way that the powdered reagents supplied through the lance are evenly distributed throughout the entire reaction chamber ¹ in the shortest possible time.

This problem is solved according to the invention by the characterizing features of claim 1. 10

Appropriate embodiments of the innovation are the subject of the subclaims.

According to the innovation, the lance is thus arranged approximately vertically and is provided with two outlet nozzles pointing in opposite directions at its end in the melt. These outlet nozzles are arranged approximately horizontally and rotated by an angle of between 30° and 60°, preferably of around 45°, relative to the longitudinal axis of the melting ladle.

If the reagents are introduced into the melting pan through such a lance, a

in both halves of the reaction chamber, a flow is created that quickly leads to an even distribution of the reagents over the entire reaction chamber. This results in improved contact between the reagents and

of the melt. Obsr concentrations of the injected reagents in individual areas of the reaction

space are avoided in this way.

The improved homogeneity of the melt and the extended residence time result in a significantly increased utilization rate of the reagents and enable a reduction in the specific reagent addition and thus a significant reduction in costs.

Further advantages achieved through the innovation include a reduction in the proportion of old slag, a reduction in ladle cleaning (for example by adding soda), a higher filling level of the torpedo melting ladles and a reduction in the specific refractory costs for the torpedo lining.

An example of the innovation is shown schematically in the drawing. It shows 20

Fig. 1 a vertical section through a melting ladle with the innovative lance,

Fig. 2 is a plan view of the arrangement according to Fig. 1.

The drawing shows a torpedo melting pan 1, into which a lance 2 extends, which is arranged approximately vertically and has two outlet nozzles 4, 5 pointing in opposite directions at its end in the melt 3. The

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Outlet nozzles 4, 5 are arranged approximately horizontally and rotated relative to the longitudinal axis 6 of the melting ladle 1 by an angle o6 of 30° to 60°, preferably of approximately 45°.

The powdered reagents supplied pneumatically through the lance 2 exit the nozzles 4 in opposite directions (arrows 7, 8) and generate a flow in both halves of the elongated reaction chamber, which leads to a rapid and uniform distribution of the reagents over the entire reaction chamber.

Claims (3)

ill tin ii 13 protection claims; 1. Device for introducing powdered reagents into a melting pan (1), containing a lance (2) for pneumatically feeding the reagents, characterized in that the lance (2) is arranged approximately vertically and is provided at its end located in the melt (3) with two outlet nozzles (4, 5) pointing in opposite directions. 2. Device according to claim 1, characterized in that the outlet nozzles (4, 5) are approximately are arranged horizontally.
15 3. Device according to claim 1, for a torpedo melting pan, characterized in that the outlet nozzles (4, 5) are arranged at an angle (ϳη ) between 30° and 60°, preferably of about 45°, relative to the longitudinal axis (6) of the melting panne (1) are rotated.