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STUDY OF HOT METAL DESULFURIZATION EFFICIENCY THROUGH THE SOLID AND LIQUID PHASES FORMED IN THE MIXTURES

STUDY OF HOT METAL DESULFURIZATION EFFICIENCY THROUGH THE SOLID AND LIQUID PHASES FORMED IN THE MIXTURES

Autoria

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

DOI

10.5151/2594-5300-34423

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Resumo

THE FORMATION OF SOLID PHASES AROUND THE CAO PARTICLE IN HOT METAL DESULFURIZATION IS REPORTED IN THE LITERATURE AS ONE OF THE MAIN CONTROLLER MECHANISMS ON THE PROCESS KINETICS. CALCIUM SULFIDES, SILICATES AND ALUMINATES ARE THE MAIN COMPOUNDS THAT HINDER THE SULFUR DIFFUSION TO LIME. THUS, THE AIM OF THIS WORK IS TO ELABORATE DESULFURIZING MIXTURES THAT FORM DIFFERENT SOLID AND LIQUID PHASES TO DEVELOP A DESULFURIZATION EFFICIENCY PREDICTING MODEL, WHICH WAS CALLED GLOBAL DESULFURIZATION FACTOR (FGDES). FOR THIS PURPOSE, 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 PERFORMED 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 THE MIXTURES WITH THE LOWEST DESULFURIZATION EFFICIENCY, WHICH SHOWS ITS KINETIC LIMITATION. IN ADDITION, THE MOST EFFICIENT MIXTURES FORMED LIQUID PHASE ABOVE 20WT%, INDICATING THAT THE CAO DISSOLVED IN THE SLAG ALSO PARTICIPATES IN THE DESULFURIZATION REACTION.

 

THE FORMATION OF SOLID PHASES AROUND THE CAO PARTICLE IN HOT METAL DESULFURIZATION IS REPORTED IN THE LITERATURE AS ONE OF THE MAIN CONTROLLER MECHANISMS ON THE PROCESS KINETICS. CALCIUM SULFIDES, SILICATES AND ALUMINATES ARE THE MAIN COMPOUNDS THAT HINDER THE SULFUR DIFFUSION TO LIME. THUS, THE AIM OF THIS WORK IS TO ELABORATE DESULFURIZING MIXTURES THAT FORM DIFFERENT SOLID AND LIQUID PHASES TO DEVELOP A DESULFURIZATION EFFICIENCY PREDICTING MODEL, WHICH WAS CALLED GLOBAL DESULFURIZATION FACTOR (FGDES). FOR THIS PURPOSE, 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 PERFORMED 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 THE MIXTURES WITH THE LOWEST DESULFURIZATION EFFICIENCY, WHICH SHOWS ITS KINETIC LIMITATION. IN ADDITION, THE MOST EFFICIENT MIXTURES FORMED LIQUID PHASE ABOVE 20WT%, INDICATING THAT THE CAO DISSOLVED IN THE SLAG ALSO PARTICIPATES IN THE DESULFURIZATION REACTION.

Palavras-chave

Desulfurization; Solid and Liquid Phases; Desulfurization Factor.

Desulfurization; Solid and Liquid Phases; Desulfurization Factor.