Title

CAC2 DEOXIDATION DURING CONVERTER TAP STEEL

CaC2 Deoxidation During Converter Tap Steel

Authorship

RODRIGUES, IVAN; MOTTA, LEONARDO SILVA; MAIA, BRENO TOTTI; NASCIMENTO, LEANDRO MIRANDA

RODRIGUES, IVAN

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MOTTA, LEONARDO SILVA

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MAIA, BRENO TOTTI

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NASCIMENTO, LEANDRO MIRANDA

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DOI

10.5151/2594-5300-42210

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Abstract

The Commercial Calcium Carbide is an alloy composed mainly by calcium carbide (CaC2) and lime (CaO). The CaC2 is used as reagent for the formation of acetylene gas, but it has great affinity with the oxygen and sulfur from the bath of steel. For this reason, this alloy is applied in steelmaking process a deoxidizer and desulfurizer. As deoxidizer has a great advantage, which is the formation of CO and lime in its deoxidation reaction. CO promotes agitation in the bath, helping to remove inclusions. The lime is a basic phase that is less aggressive to the refractory, such SiO2 and Al2O3, formed by the traditional deoxidizer used in steelmaking, FeSi, FeSiMn and Aluminum. In relationship to aluminum, the CCC is a less expensive alloy and for its technical reasons could replace the aluminum reducing meltshop cost. In a Brazilian steelmaking mill was tested the CCC application at the tapping process. The quantitative and qualitative effects of this practice was observed and related in this paper.

THE COMMERCIAL CALCIUM CARBIDE IS AN ALLOY COMPOSED MAINLY BY CALCIUM CARBIDE (CAC2) AND LIME (CAO). THE CAC2 IS USED AS REAGENT FOR THE FORMATION OF ACETYLENE GAS, BUT IT HAS GREAT AFFINITY WITH THE OXYGEN AND SULFUR FROM THE BATH OF STEEL. FOR THIS REASON, THIS ALLOY IS APPLIED IN STEELMAKING PROCESS A DEOXIDIZER AND DESULFURIZER. AS DEOXIDIZER HAS A GREAT ADVANTAGE, WHICH IS THE FORMATION OF CO AND LIME IN ITS DEOXIDATION REACTION. CO PROMOTES AGITATION IN THE BATH, HELPING TO REMOVE INCLUSIONS. THE LIME IS A BASIC PHASE THAT IS LESS AGGRESSIVE TO THE REFRACTORY, SUCH SIO2 AND AL2O3, FORMED BY THE TRADITIONAL DEOXIDIZER USED IN STEELMAKING, FESI, FESIMN AND ALUMINUM. IN RELATIONSHIP TO ALUMINUM, THE CCC IS A LESS EXPENSIVE ALLOY AND FOR ITS TECHNICAL REASONS COULD REPLACE THE ALUMINUM REDUCING MELTSHOP COST. IN A BRAZILIAN STEELMAKING MILL WAS TESTED THE CCC APPLICATION AT THE TAPPING PROCESS. THE QUANTITATIVE AND QUALITATIVE EFFECTS OF THIS PRACTICE WAS OBSERVED AND RELATED IN THIS PAPER.

Keywords

Calcium Carbide, Deoxidation, Desulfurizing, Cost reduction

Calcium Carbide, Deoxidation, Desulfurizing, Cost reduction