SU490833A1 - Lance for purging liquid metal - Google Patents

Description

The invention relates to the field of ferrous metallurgy, in particular to oxygen lances for purging melts during the steelmaking process.

A known lance for purging liquid metal, comprising an oxidant feed channel, a shielding gas feed channel concentric to it and refractory coils on the outer surface of the tuyere tip, separated by annular metal gaskets. Such a lance is reliably protected from burnout. However, the durability of the refractory coils, especially those immersed in the slag layer, is insufficient, their frequent replacement reduces the performance of the melting unit. With the aim of improving the durability of the tuyere, it is proposed to make holes in metal gaskets that connect with the protective gas feed channel.

FIG. 1 depicts hay proposed lance, longitudinal section; on fi1. 2 is a cross section of an annular metal gasket.

The lance consists of concentrically arranged tubes 1-4, which form cavities: 5- for supplying oxygen, 6 - for supplying gas, and 7-8 for supplying and discharging water.

In order to increase the durability and to avoid water ingress during a burnout, the tuyere is designed in the hearth of the purge so that only a portion of it is cooled, which

2

is located above d) anise slagmegl. A part of the under-chain lance with refractory coils :: 9, which are separated by metal gaskets 10, is immersed in the metal. 10 gaskets 10 have holes 11 that also pass through pipe 2 and special chip with a gas cavity 6. During the process, metal lances are tucked into the metal the gaskets 10; they must be displaced, therefore, to ensure the free passage of protective gas from the cavity G into the holes 11, the gaskets are provided on the inner surface of the annular rim 12. The furr works as follows. Water is supplied to the cavity 7 for cooling.

of the tuyeres, and then otvodptts through the cavity 8. K and the oxygen enters the metal from the cavity 5, and the protective gas from the cavity 6, wherefrom the channel also enters the channels 11. With the passage of the channel 3 channels 11, the protective gas protects the metal gaskets 10 n nearby areas of refractory coils from the air of metal and sclac.

Ф орм ул а and 3 о б 1 с т е and i

A tuyere for purging a liquid metal, containing an oxidant feed channel, a co-centered channel for the h.d. gas and a refractory coil on the surface of the tuyere tip, separated by

annular metallic prkzhladkamp.

characterized in that, in order to increase the durability of the tuyere, metal gaskets are provided with openings communicating with a channel for supplying a protective gas.

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