RU1794095C - Method of pig-and-scrap process of steel melting in open-hearth furnace - Google Patents

Abstract

Usage: in the steel industry. SUMMARY OF THE INVENTION: A charge for steelmaking, additionally containing complex carbonaceous iron flux (KUZHF), is loaded into an open-hearth furnace in the following ratio, wt.%: Iron flux 2-7; steelmaking lime 3-5; scrap metal 66-68; cast iron the rest. The mixture is heated in an open-hearth furnace at a speed of 20-80 degrees per minute. ALCF contains carbon and oxides of silicon, iron and calcium,

Description

The invention relates to metallurgy.

A known method of steelmaking in an open-hearth furnace, including the filling of solid cast iron, steel lime and scrap metal, heating the mixture and its melting.

A disadvantage of the known method of steel smelting is the high energy consumption during melting, as well as a low yield of metal.

The closest in technical essence and the achieved result is a method of steel smelting in an open-hearth furnace by a scrap process, including the filling of solid cast iron, scrap metal, steel smelting, welding slag, their heating and melting.

The main disadvantage of the prototype is its low metal yield.

The aim of the invention is to increase the yield of metal.

For this, in the method of steel smelting in an open-hearth furnace by a scrap process, including the filling of solid cast iron, scrap metal / steel-smelting lime and solid oxide material, their heating and melting, carbon and silicon oxides, iron, calcium complex carbon are used as solid oxide material iron flux in the following ratio of components in the mixture, wt.%:

Complex carbonaceous iron flux2-7 Steelmaking 3-5 Scrap metal 66-68 Solid cast iron The rest is heated at a rate of 20-80 ° C / min.

The use of complex carbonaceous iron flux, for example, dross, together with lime, scrap metal and cast iron at a heating rate of 20-80 ° C / min, improves the mode of slag formation, compensates for heat consumption, facilitates the process of melting the scrap, and thereby increase the yield of metal.

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Example. Steel smelting was carried out in a 100 kg model of an open-hearth furnace with a scrap process.

Used a mixture based on solid cast iron, lime, scrap metal and complex carbonaceous iron flux. Zhelezoflyus was used in the form of non-calcined calcin-flux-coal briquettes with a calcareous bond. The charge was charged in the following sequence: 4 kg of lime were loaded onto the bottom, then scrap was fed into

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amount of 67 kg, iron flux in the form of briquettes in the amount of 4.5 kg and then cast iron 24.5 kg were loaded onto the scrap metal from above, the furnace was heated with natural gas at a pressure of 3 atm. The gas was burned in a stream of cold air enriched with oxygen up to 35%. The melting temperature of the charge was 1125 ° C, and the rate of heating of the charge was 50 ° C / min. The melting time was 2 hours.

The yield of metal compared with the prototype increased from 91 to 96%.

Claims (1)

SUMMARY OF THE INVENTION A method for steelmaking in an open-hearth furnace by a scrap process, including the filling of solid cast iron, scrap metal, steelmaking lime, and solid oxide material, their heating and melting, and the fact that, as solid oxide material is used containing carbon and oxides of silicon, iron, calcium complex carbonaceous iron flux in the following ratio of components in the mixture, wt.%: Complex carbonaceous iron flux2-7 Steelmaking 3-5 Scrap metal 66-68 Hard iron The rest. while they are heated at a speed of 20-80 hail, in minutes