SU945180A1 - Method for producing steel in convertor - Google Patents

Description

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The invention relates to ferrous metallurgy, namely to the production of steel in oxygen converters,

The closest to the proposed technical essence and the achieved effect is the method of steel production in BO-ton converters, which includes leaving the previous slag melting, thickening the slag with an additive of decontamination materials, filling up scrap, pouring iron, adding slag-forming materials and blowing oxygen into the bath, during which Before starting to blow down, they sit down in the slag 20-25 remaining in the converter. the total consumption of lime smelting, cast iron is poured in a slow stream for 5 minutes, i.e. at a speed of 1015 t / min, in order to avoid emissions from contact of the cast iron. with the slag left l.

The disadvantage of this method is the inadequate decontamination of slag due to the absence of its mixing with lime, as a result of which the duration of the casting of iron is lengthened.

The purpose of the invention is to increase the productivity of converters and eliminate emissions from casting iron.

This goal is achieved by the fact that in the production of steel in an envelope 10 P, which includes leaving the slag of the previous melt with an additive on the slag of decontamination materials, filling of scrap, pouring of cast iron, additive of slag-forming materials

, 5, and the bath purging with oxygen, the decontamination materials applied to the slag are mixed with the slag with a neutral gas, and nitrogen is used as the neutral gas.

20 Sit down decontamination materials should not be slagged into clumps, i.e. must be evenly distributed in the slag so that the whole volume thickens and neutrals39

call slag. It is not possible to mix the slag with the indicated materials with an oxygen stream, since metal residues in the converter and iron particles in the slag are oxidized, which leads to an increase in its activity. Therefore, mixing the slag with the materials being planted is possible only with neutral gas, which provides additional cooling of the slag and a reduction in the consumption of materials.

Example 1. After the phosphorus pig iron was blown in a 10-to-ton converter, about 2 tons of slag were left with a content of 4: 26, k FeOJ 40, t (CaO; U, 7. Ha slag was placed with TOO kg of coke, then lime was added to the slag at an amount of 300 kg. Washed for 15 seconds at a nitrogen consumption of kO. The converter was not pumped to neutralize the slag. Iron was cast at a rate of 70 tons per minute. There was no intensive outgassing.

Example 2. In a 10-ton converter, at the conversion of low-manganese iron, about 25 final slag from the previous smelting was left in the converter. 50 kg of lime, 100 kg of dolomite and 50 kg of mar, of the Ganzev slag produced by

0 4

production of ferromanganum14a. Purged with nitrogen 10c. Casting iron runs at a speed of 60 t / min calmly, without emissions.

The economic effect for the conditions of the converter shop will be 229 thousand rubles. in year.

Claims (2)

1. Method of steel production in the converter, including leaving the lacquer of the previous melt with an additive on the slag decontamination materials, filling up scrap, pouring the cast iron, adding the slag-forming materials and blowing the bath with oxygen, in order to improve the performance of the converters and eliminate emissions during the casting of iron sitting down no slag decontamination materials are mixed with slag neutral gas. 2. The method according to claim 1, characterized in that nitrogen is used as a neutral gas. Sources of information taken into account in the examination 1. Yavoisky V.I. and others. Metallurgists of steel. M., Metallurgists, 1973, cJ91.