SU1068498A1 - Charge for producing high-carbon metal - Google Patents

Abstract

CHARGE LH of production of high-grade ferrous metal, consisting of steel scrap and carbon-containing material, different from. the fact that, in order to improve the quality of the charge, reducing its cost. to improve working conditions, it additionally contains iron kondentarat, and carbon-containing MaTepHal - in the form of petroleum coke with the following ratio of components, wt.%; Iron concentrate 16-58.3 Oil coke 4-12.6 Steel scrap Else

Description

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00 The invention relates to ferrous metallurgy, more specifically to methods for producing steel in electric furnaces. Known composition of the mixture, including the limiting cast iron and carbon-containing material 1. The disadvantages of the known composition of the mixture are the high phosphorus content (0.10-0.18%), the high consumption of slag-forming materials for the dephosphorization process and the high cost of the charge. The closest to the proposed technical essence and the achieved result is the C2 composition of the charge, consisting of steel scrap and carbon-containing material, with the following ratio of components, may.%: Limit cast iron 1-55 Lignin coal 4-0.1 Steel scrap The rest The known charge has an elevated phosphorus content of about 0.07%, a significant consumption of slag-forming materials for carrying out the process of dephosphorization, which is associated with the high cost of manual labor of builders and a relatively high cost. The aim of the invention is to improve the quality of the charge, reduce its cost and improve working conditions. This goal is achieved by the fact that the charge for obtaining high-carbon sheet metal, consisting of steel scrap and carbon 9 Retaining material, additionally contains iron concentrate, and carbon-containing material in the form of petroleum coke in the following ratio of component% by weight: Iron concentrate 16- 58.3 Petroleum coke 4-12.6 Steel scrap Remaining The average chemical composition of iron concentrate is as follows, wt%: PeO 29; FeaOj 70; CaO 0.01; S-iO20,3. 0.2; degOe 0,2; MtiO 0.05; РгОг 0,01; 5 0.05; other oxides remain. The reobs content in the concentrate is 72%. Low latency concentration provides a significant reduction in

1.0 71

28 80

0.07 57.17 0.032 34.52 lower phosphorus concentration in the mixture. The use of such a mixture is most advisable when smelting high-quality steel and synthetic cast iron used in powder metallurgy in an electric furnace. Experiments on the reduction of the concentrate by a carbon-containing material — petroleum coke showed that the degree of reduction of iron oxides is on average 90% with a degree of carbon absorption of about 90% of its stoichiometric consumption for the reduction of iron oxides. The concentrate content in the charge is 16-58.3%. The upper limit of the concentration of the concentrate is determined from the following condition: the concentrate should not be in contact with the lining of the electric furnace, and this is ensured if there is a steel scrap substrate, which is poured on the bottom 150–200 mm. If this condition is violated, the bottom of the electric furnace can undermine. The lower limit of the concentrate content in the charge is limited by an increase in the phosphorus content, which reaches values of 0.035-0.04% and approaches the phosphorus content in the steel scrap, which leads to an increased consumption of slag-forming materials. The content of petroleum coke is determined from the conditions of stoichiometric reaction of reducing iron oxide with carbon, taking into account the degree of its assimilation (90%), the average carbon content in petroleum coke (7495%), the required carbon content in the metal to melt the mixture ShKh-15 and ".4% for synthetic cast iron) and the average carbon content in steel scrap (i 0.3%). Conducted semi-industrial testing of steel smelting ShH-15 and synthetic cast iron using the composition of the charge indicated in the table. Preparation and charging of the charge is carried out in the following way. The iron concentrate and oil tank are pre-mixed in a drum-type mixer. On the furnace hearth, small steel scrap is loaded with a layer of 150-200 mm and then a mixture of concentrate and petroleum coke is seated.

The data in the table show that the phosphorus content in the composition of the mixture and its cost is significantly lower than in the known.

The use of such a composition and their ITTOR to obtain a high-carbon metal helps to reduce the cost of the metal produced by reducing the consumption of slag-forming and redundant pig iron, while facilitating the maintenance of the table.

baking staff, as sign.

The cost of manual labor for steelmakers to download and induce slag in an electric furnace and to dephosphorize metal is significantly reduced.

Reducing the cost of the slag-forming mixture is achieved by reducing the consumption of pig iron and lignin coal.

Thus, the cost of the proposed charge will decrease by 29, 67 rubles / ton.

Claims (1)

J54). MIXTURE FOR PRODUCING A HIGH-CARBON METAL, consisting of steel alloy and carbon-containing material, distinguishing p. I mean that, in order to improve the quality of the charge, reduce its cost and improve working conditions, it additionally contains iron concentrate, and the carbon-containing material is in the form of petroleum coke with a poor ratio of components, May.%: Iron concentrate 16-58.3 Petroleum coke 4-12.6 Steel scrap