SU1260391A1 - Blast furnace main runner - Google Patents

Abstract

The invention relates to ferrous metallurgy and is intended for use in a blast furnace in the separation of iron and slag. The purpose of the invention is to reduce iron losses and slag contamination by pig iron ladles, which is achieved by establishing optimal ratios between the geometric dimensions of the main trough body, skimmer plate and the pshakootvod ditch. The main trough includes a housing 1, its lining 2, slag ditch 3, slag pass 4, skimmer slab 5 of the slag ditch. There is a gap between the lower cut of the skimmer plate and the bottom of the slag channel. Reduction of iron losses and contamination by slag of pig iron-made ladles is achieved by establishing the relationship of the height and clearance of the skimmer slag channel to the height of the trough body and the upper section of the skimmer slab below vertical slag 5 0.2-0.8 and 0.05- 0.4 hull height, and the level of the pass below the level of the additional skimmer plate. 1 il. sl 1№ a s 00 s

Description

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The invention relates to ferrous metallurgy and is used in a blast furnace for the separation of iron and slag.

. The purpose of the invention is to reduce the loss of pig iron contaminated with the slag of the tubular ladles.

The drawing shows the gutter, cross section.

The device consists of a housing 1, its lining 2, slag ditch 3, slag pass 4, skimmer plate 5, located in the slag ditch. .

The device works in the following way.

At the output of the smelting products, the plate 5 props up in the chute an intermediate layer of slag 8, most of which is enriched with drops of cast iron, causing its low mobility between the layers of iron 6 and the top layer of slag 7, in which the content of iron drops 9 is significantly less than in the layer slag 8. As a result, the conditions for the precipitation of droplets of iron from the slag 8 are improved and their discharge into the slag ditch is prevented. . The speed of movement of the upper slag layer 7 between the slag pass 4 and the housing 1 is slowed down, which contributes to the deposition of droplets of cast iron 9, taken out of the skimmer plate 5, which flow back through the gap 9 into the chute.

It has been experimentally established that with a skimmer plate height below 0.2 of the height of the hull, the reduction is effective. N. Kistutined Editor Order 5192/22

Compiled by N.- Dunaev

Tehred A. Kravchuk Proofreader M. Maksimishinets

Circulation 552. Subscription VNyIPI State Committee of the USSR.

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, - Uzhgorod, st. Project, 4

60391:, 2.

No separation of iron and slag is observed, and when this ratio of 0.8 is exceeded, the relative amount of slag entering the iron ladle ladles increases due to an increase in the accumulation of slag in the hull.

Limiting the maximum gap between the bottom cut of the skimmer plate 10 and the bottom of the slag channel of 0.4 body height prevents. The intermediate layer of the slag melt 8 saturated with iron into the slag channel and reducing the gap 5 to 0.05 causes it to become frozen with solidifying iron. and prevents the iron from flowing down, and also complicates the maintenance of the chute.

The use of the invention makes it possible to reduce the loss of cast iron with slag and slag ingress into the cast iron ladles.

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About rmu l and

the invention

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The main trench of the blast furnace, comprising a lined hull, a slag ditch with a skimmer slab and a slag pass, characterized in that, in order to reduce the loss of iron and contamination with slag of the iron-scoop ladles, the height of the skimmer slag ditch plate and the gap between its bottom section and bottom slag - the ditch is correspondingly 0.2-0.8 and 0.005-0.4 of the height of the body, with the upper section of the skimmer plate located below the level of the slag pass.

Claims (1)

Claim The main gutter of the blast furnace, comprising a housing with a lining, a slag ditch with a skimmer plate and a slag pass, characterized in that, in order to reduce cast iron losses and slag contamination of the iron ladles, the height of the skimmer slag ditch plate and the gap between its lower slice and the slag ditch bottom they make up 0.2-0.8 and 0.005-0.4 of the corpus height, and the upper section of the skimmer plate is located below the level of the slag pass.