Title

INFLUENCE OF SLAG AND SILICON IN HOT METAL ON STEEL DEPHOSPHORIZATION

INFLUENCE OF SLAG AND SILICON IN HOT METAL ON STEEL DEPHOSPHORIZATION

Authorship

Souza, Raphael Mariano de; Santos, Inamara Amanda Souza; Silva, Caio Vaccari; Grillo, Felipe Fardin; Oliveira, José Roberto de; Andreatta, Vinícios

Souza, Raphael Mariano de

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Santos, Inamara Amanda Souza

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Silva, Caio Vaccari

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Grillo, Felipe Fardin

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Oliveira, José Roberto de

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Andreatta, Vinícios

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DOI

10.5151/2594-5300-34467

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Abstract

UNDERSTANDING THE FACTORS THAT INFLUENCE THE EFFECTIVENESS OF STEEL DEPHOSPHORIZATION ALLOWS FOR BETTER PROCESS CONTROL AND OPTIMIZATION. THE PRESENT WORK AIMS TO STUDY THE PROPERTIES OF LD CONVERTER SLAG AND THE HOT METAL SILICON CONTENT, IN ORDER TO DEVELOP A SOLID SCIENTIFIC BASIS FOR MODELING THE DEPHOSPHORIZATION AND ASSESS DEPHOSPHORIZATION EFFICIENCY. DIFFERENT COMPOSITIONS OF INDUSTRIAL HEAT SLAGS WERE SELECTED TO BE ANALYZED. THE MENTIONED SLAG PROPERTIES AND PHASES WERE DETERMINED BY COMPUTATIONAL THERMODYNAMICS USING THE SOFTWARE FACTSAGE 8.0 AND THE RESULTS OF THESE ANALYZES WAS RELATED TO THE DEPHOSPHORIZATION EFFICIENCY FROM THE RESPECTIVE HEATS SLAGS. BASED ON THESE SIMULATIONS, THE PARAMETER DEPHOSPHORIZATION FACTOR (FDEP = ACAO + AFEO + (NLIQUID – NSOLID)* KDEP) WAS USED TO MEASURE THE SLAGS EFFICIENCY IN HOT METAL DEPHOSPHORIZATION AND ANALYZES WERE MADE AND DISCUSSED BY CHARTS PLOTTING AND CORRELATION OBSERVATION. THE RESULTS SHOW THAT GREATER CAO ACTIVITY IS AN IMPORTANT CONDITION TO PROMOTE DEPHOSPHORIZATION, WHEREAS HOT METAL WITH HIGHER SI CONTENT PRESENTS LESS EFFICIENCY IN DEPHOSPHORIZATION, DUE TO THE HIGHER SIO2 FORMATION, WHICH DECREASES THE BASICITY. IT WAS FOUND THAT FDEP PRESENTS A HIGH CORRELATION (R2) WITH THE DEPHOSPHORIZATION EFFICIENCY AND CAN BE USED TO PREDICT WHICH SLAG WILL BE THE MOST EFFICIENT.

UNDERSTANDING THE FACTORS THAT INFLUENCE THE EFFECTIVENESS OF STEEL DEPHOSPHORIZATION ALLOWS FOR BETTER PROCESS CONTROL AND OPTIMIZATION. THE PRESENT WORK AIMS TO STUDY THE PROPERTIES OF LD CONVERTER SLAG AND THE HOT METAL SILICON CONTENT, IN ORDER TO DEVELOP A SOLID SCIENTIFIC BASIS FOR MODELING THE DEPHOSPHORIZATION AND ASSESS DEPHOSPHORIZATION EFFICIENCY. DIFFERENT COMPOSITIONS OF INDUSTRIAL HEAT SLAGS WERE SELECTED TO BE ANALYZED. THE MENTIONED SLAG PROPERTIES AND PHASES WERE DETERMINED BY COMPUTATIONAL THERMODYNAMICS USING THE SOFTWARE FACTSAGE 8.0 AND THE RESULTS OF THESE ANALYZES WAS RELATED TO THE DEPHOSPHORIZATION EFFICIENCY FROM THE RESPECTIVE HEATS SLAGS. BASED ON THESE SIMULATIONS, THE PARAMETER DEPHOSPHORIZATION FACTOR (FDEP = ACAO + AFEO + (NLIQUID – NSOLID)* KDEP) WAS USED TO MEASURE THE SLAGS EFFICIENCY IN HOT METAL DEPHOSPHORIZATION AND ANALYZES WERE MADE AND DISCUSSED BY CHARTS PLOTTING AND CORRELATION OBSERVATION. THE RESULTS SHOW THAT GREATER CAO ACTIVITY IS AN IMPORTANT CONDITION TO PROMOTE DEPHOSPHORIZATION, WHEREAS HOT METAL WITH HIGHER SI CONTENT PRESENTS LESS EFFICIENCY IN DEPHOSPHORIZATION, DUE TO THE HIGHER SIO2 FORMATION, WHICH DECREASES THE BASICITY. IT WAS FOUND THAT FDEP PRESENTS A HIGH CORRELATION (R2) WITH THE DEPHOSPHORIZATION EFFICIENCY AND CAN BE USED TO PREDICT WHICH SLAG WILL BE THE MOST EFFICIENT.

Keywords

Dephosphorization; Steelmaking; Computational Thermodynamics; FactSage

Dephosphorization; Steelmaking; Computational Thermodynamics; FactSage