Title

LIME PARTIAL REPLACEMENT FOR WASTES CONTAINING CAO IN HOT METAL DESULFURIZATION

LIME PARTIAL REPLACEMENT FOR WASTES CONTAINING CAO IN HOT METAL DESULFURIZATION

Authorship

Santo, Elton Volkers do Espírito; Soares, Silas Gambarine; Junca, Eduardo; Grillo, Felipe Fardin; Oliveira, José Roberto de

DOI

10.5151/2594-5300-34422

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Abstract

THE STEEL PRODUCTION ENHANCEMENT IN RECENT DECADES HAS INCREASED THE SOLID WASTE GENERATION IN THE STEEL PLANTS. DUE TO THE INCREASE IN THE ENVIRONMENTAL POLICIES STRINGENCY, EFFORTS HAVE BEEN MADE TO GIVE THEM A MORE APPROPRIATE DESTINATION. IN THIS CONTEXT, THE INTERNAL REUSE OF THESE MATERIALS IS A SOLUTION OFTEN APPLIED BY THE INDUSTRY TO REDUCE PRODUCTION COSTS AND TO DECREASE SLAG GENERATION. THEREFORE, THE WORK AIM IS TO REPLACE CALCITIC LIME BY LIMESTONE FINE AND KR SLAG IN HOT METAL DESULFURIZATION, WHICH ARE RESIDUES FROM STEEL PRODUCTION. EXPERIMENTAL DESULFURIZATION TESTS WERE CARRIED OUT IN A RESISTANCE FURNACE AT A TEMPERATURE OF 1350°C, IN AN INERT ATMOSPHERE WITH CONSTANT STIRRING OF 500 RPM. ALONG WITH THE TESTS, SIMULATIONS WERE CARRIED OUT WITH FACTSAGE 7.0 SOFTWARE IN ORDER TO OBTAIN THE PHASES PRESENT IN EACH MIXTURE AT THE WORKING TEMPERATURE AND COMPARE THEM WITH THE PRACTICAL RESULTS. IT WAS FOUND THAT THE TRICALCIUM SILICATE PHASE (3CAO.SIO2) WAS PRESENT IN MIXTURES WITH LOWER DESULFURIZATION EFFICIENCY, WHICH SHOWS ITS KINETIC LIMITATION. THE USE OF LIMESTONE FINE PROVED TO BE MORE EFFICIENT THAN THE USE OF KR SLAG. THEREFORE, IT IS RECOMMENDED ITS USE ONLY IN LOW PROPORTIONS.

 

THE STEEL PRODUCTION ENHANCEMENT IN RECENT DECADES HAS INCREASED THE SOLID WASTE GENERATION IN THE STEEL PLANTS. DUE TO THE INCREASE IN THE ENVIRONMENTAL POLICIES STRINGENCY, EFFORTS HAVE BEEN MADE TO GIVE THEM A MORE APPROPRIATE DESTINATION. IN THIS CONTEXT, THE INTERNAL REUSE OF THESE MATERIALS IS A SOLUTION OFTEN APPLIED BY THE INDUSTRY TO REDUCE PRODUCTION COSTS AND TO DECREASE SLAG GENERATION. THEREFORE, THE WORK AIM IS TO REPLACE CALCITIC LIME BY LIMESTONE FINE AND KR SLAG IN HOT METAL DESULFURIZATION, WHICH ARE RESIDUES FROM STEEL PRODUCTION. EXPERIMENTAL DESULFURIZATION TESTS WERE CARRIED OUT IN A RESISTANCE FURNACE AT A TEMPERATURE OF 1350°C, IN AN INERT ATMOSPHERE WITH CONSTANT STIRRING OF 500 RPM. ALONG WITH THE TESTS, SIMULATIONS WERE CARRIED OUT WITH FACTSAGE 7.0 SOFTWARE IN ORDER TO OBTAIN THE PHASES PRESENT IN EACH MIXTURE AT THE WORKING TEMPERATURE AND COMPARE THEM WITH THE PRACTICAL RESULTS. IT WAS FOUND THAT THE TRICALCIUM SILICATE PHASE (3CAO.SIO2) WAS PRESENT IN MIXTURES WITH LOWER DESULFURIZATION EFFICIENCY, WHICH SHOWS ITS KINETIC LIMITATION. THE USE OF LIMESTONE FINE PROVED TO BE MORE EFFICIENT THAN THE USE OF KR SLAG. THEREFORE, IT IS RECOMMENDED ITS USE ONLY IN LOW PROPORTIONS.

Keywords

Desulfurization; Limestone Fine; KR Slag; Solid and Liquid Phases.

Desulfurization; Limestone Fine; KR Slag; Solid and Liquid Phases.