Spray gun used for desulphurizing by directly spraying and blowing magnesium desulfurizing agent to molten iron

Abstract

The invention discloses a spray gun used for desulphurizing by directly spraying and blowing a magnesium desulfurizing agent to molten iron. The spray gun is composed of a connecting section, a gun body section and a spraying-blowing section. The connecting section is sequentially composed of a connecting flange and a compound gun core. The outer wall of the gun body section and the outer wall of the spraying-blowing section are made of fire resistant materials in a lining pouring manner to form a gun wall. The spraying-blowing section comprises a spraying-blowing section gun body and a special-shaped gun head arranged at the top end of the spraying-blowing section gun body. The compound gun core sequentially comprises an inner inserting pipe, a main pipe and a reinforcement pipe from inside to outside. The main pipe is inserted into an inner inserting pipe connector. The inner inserting pipe penetrates the inner inserting pipe connector and is inserted into the end of a vertical channel. A graphite spraying-blowing pipe is installed in a radial horizontal channel, extends outwards and is installed in a graphite spraying-blowing pipe installing hole in the gun wall. By means of the spray gun, smoothness of a spraying-blowing flowing channel of the spray gun is guaranteed, the comprehensive using performance of the spray gun is greatly improved, and the comprehensive aims that the service life of the spray gun is prolonged, the maintenance cost of the spray gun and the consumption of the desulfurizing agent are reduced, and the desulphurization production working rate is increased are achieved.

Description

technical field

[0001] The invention relates to the field of molten iron pretreatment, in particular to a desulfurization spray gun for direct injection of magnesium desulfurizer into molten iron. Background technique

[0002] The document "External desulfurization of molten iron, Shanxi Metallurgy, 2007, No1" reported that molten iron is the basic raw material for molten steel smelting, and its chemical composition and physical properties determine the quality of steel products and the benefits of enterprises to some extent. Therefore, Since the 1970s, people began to pay attention to the development of molten iron pretreatment technology, and continuously improved its technology and methods to remove harmful elements in molten iron. In addition to sulfur-containing steel, sulfur is one of the main harmful elements in steel, but in the process of blast furnace ironmaking, it is necessary to increase the alkalinity of slag and furnace temperature, which will reduce the techn...

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