SU821040A1 - Trough for conveying liquid metal - Google Patents

Description

(54) GALVES FOR OVERFILLING. LIQUID METAL

one

The invention relates to the casting of metals, in particular to the treatment of melt in ladles or feed chutes before casting.

Apparatus for treating the melt by injecting powdered reagents into it through a tuyere mounted in the wall of a lined vessel are known.

The operation of these devices is associated with the need to grind solid regulators and to construct complex, pressurized plants for transporting reagents in the bulk of the metal 1.

However, the increased removal of reagents by the carrier gas leads to an increase in their consumption and pollution of the environment.

A liquid metal overflow chute is also known, comprising a shear-shaped lining body, a cavity formed by the ledge and a channel in the lining for introducing reagents.

This chute provides the ability to treat the metal with reagents without using a carrier gas. Reagents can be introduced into the cavity formed by the ledge using a screw or in the form of capsules filled with the reaction mixture 2.

However, when moving along the chute of large masses of metal with high speed, the efficiency of refining is insufficient due to the relatively short contact time of the reacting phases and the small interface surface.

The purpose of the invention is to increase the efficiency of metal refining.

The goal is achieved by the fact that

chute for the overflow of liquid metal from a metallurgical unit or ladle, including a body with a stepped lining formed by a ledge cavity

and the channel in the liner for introducing reagents is made tapering to the toe and throughout

Claims (2)

the length is divided by longitudinal partitions into three sections, communicating with each other by openings located in partitions in a checkerboard pattern, with the base of the middle section containing two stages, one of which is located at the level of the ends of the outer sections, the second is below this level, and the openings in the partitions between drain toe and ledge of the gutter equipped with visors. Splitting the gutter along the entire length of the longitudinal partitions into three sections creates the conditions for organizing in the same chute three longitudinal metal threads isolated from each other. The bream of the middle section contains two stages, the upper of which allows the formation of a cavity for the introduction of reagents. The upper stage of the middle section is made flush with the boards of the outer sections, which makes it possible to form additional transverse metal flows that fall into the openings of the separating longitudinal partitions by the metal flow passing through the lower stage of the middle section. The arrangement of the openings in the shahmatny order ensures the continuity of the flow of the metal covering its lower stream and reagents emerging from it along the entire length of the lower stage of the trough. The presence of visors in the lower part of the openings in the area between the toe and the ledge provides the necessary trajectory of metal falling and improves the conditions of mixing of the reacting phases. A chute tapering towards the toe ensures the continuity (flux) of the stream falling on the lower metal stream along the entire length of the lower stage of the middle section of the chute. FIG. 1 shows a gutter; in fig. 2 - the same, top view. The chute contains a lined body 1, a channel 2 for introducing reagents, a ledge 3 formed by a ledge cavity 4, longitudinal partitions 5, upper 6 and lower 7 steps of the middle section, openings 8 in partitions 5 and peaks 9 in the lower part of openings. The overflow and processing of the metal is carried out as follows. At the same time as the beginning of the overflow of the metal, powder-like reagents, such as calcium carbide, are introduced into the cavity 4 by means of a screw. Metal flows along the gutter in three streams. The extreme metal flows through the openings 8 fall on the metal flow, carrying the reagents and passing through the lower stage 7 of the middle section of the gutter, to the intensification of the mass exchange process of the reacting phases. The arrangement of the openings of the partitions in a shakhmatny order, as well as the presence of peaks in the lower part of the openings, ensures continuous, over the entire area of the lower metal flow, the flow of metal from above, the entrainment of the emerging reagent particles deep into the metal and its additional processing. Directly at the drain of the gutter, a skimmer partition is installed, which delays the floating reagents, which, as they accumulate, are removed into the slag thicket. The flow of reagents into the cavity of the gutter is stopped simultaneously with the end of the overflow of the metal. The gutter design can be used in blast furnaces for desulfurization and modification of pig iron, as well as in steel smelters for desulfurization, deoxidation and alloying of steel. Such a structure is simple in technical implementation and is not associated with significant material costs. The invention The chute for the overflow of liquid metal from a metallurgical unit, comprising a housing with a shoulder-shaped lining, a cavity formed by a ledge, and a channel in the lining for. the introduction of reagents, characterized in that, in order to increase the efficiency of refining, the chute is made tapering to the toe and provided with longitudinal partitions dividing it along the entire length into three sections, which are communicated with each other by openings made in partitions in a shakhmat order, moreover, the bottom of the middle section has two steps, one of which is located at the level of the bottom sections of the outer sections, and the other is lower, and the openings in the partitions are equipped with visors. Sources of information taken into account in the examination 1. UK patent number 1271021, cl. In 3 F, 1970. 2. USSR author's certificate No. 668951, cl. C 21 C 7/00, 1976.