Title

INFLUENCE OF MINERALOGICAL ORIGIN ON DRI QUALITY: MICROSTRUCTURAL COMPARISON BETWEEN HEMATITE AND MAGNETITE PELLETS

INFLUENCE OF MINERALOGICAL ORIGIN ON DRI QUALITY: MICROSTRUCTURAL COMPARISON BETWEEN HEMATITE AND MAGNETITE PELLETS

Authorship

LUGO, ANA CECILIA CACHUTT; CAMPOS, FERNANDO CAMARA; ARECHIGA, CARLOS; LONGORIA, ROGELIO RAMÍREZ; CONSTANTE, MARIELA; PEREZ, LUIS ANGEL; PEDRAZA, JUAN PABLO; LLAMAS, MARIO; GARCÍA, OMAR

LUGO, ANA CECILIA CACHUTT

I am this author

CAMPOS, FERNANDO CAMARA

I am this author

ARECHIGA, CARLOS

I am this author

LONGORIA, ROGELIO RAMÍREZ

I am this author

CONSTANTE, MARIELA

I am this author

PEREZ, LUIS ANGEL

I am this author

PEDRAZA, JUAN PABLO

I am this author

LLAMAS, MARIO

I am this author

GARCÍA, OMAR

I am this author

DOI

10.5151/2594-357X-42885

Downloads

Abstract

This investigation has been carried out to stablish the influence of microstructural characteristics on the reducibility and quality of iron ore pellets in order to understand how iron ore origin (hematite or magnetite) influence pellet performance. Hematite and magnetite-based pellets were analyzed using conventional characterization and advanced microscopy techniques, like SEM/EDS and SEM/EBSD. Reducibility evaluation was carried out through basket tests in HYL ZR reactor under plant operational conditions. The better results of reducibility and metallization was obtained for magnetite-based pellet with small grain size without coalescence and higher density of finely distributed pores. These findings highlight the importance of controlling microstructure to enhance both the operational performance and metallurgical quality of iron ore pellets.

THIS INVESTIGATION HAS BEEN CARRIED OUT TO STABLISH THE INFLUENCE OF MICROSTRUCTURAL CHARACTERISTICS ON THE REDUCIBILITY AND QUALITY OF IRON ORE PELLETS IN ORDER TO UNDERSTAND HOW IRON ORE ORIGIN (HEMATITE OR MAGNETITE) INFLUENCE PELLET PERFORMANCE. HEMATITE AND MAGNETITE-BASED PELLETS WERE ANALYZED USING CONVENTIONAL CHARACTERIZATION AND ADVANCED MICROSCOPY TECHNIQUES, LIKE SEM/EDS AND SEM/EBSD. REDUCIBILITY EVALUATION WAS CARRIED OUT THROUGH BASKET TESTS IN HYL ZR REACTOR UNDER PLANT OPERATIONAL CONDITIONS. THE BETTER RESULTS OF REDUCIBILITY AND METALLIZATION WAS OBTAINED FOR MAGNETITE-BASED PELLET WITH SMALL GRAIN SIZE WITHOUT COALESCENCE AND HIGHER DENSITY OF FINELY DISTRIBUTED PORES. THESE FINDINGS HIGHLIGHT THE IMPORTANCE OF CONTROLLING MICROSTRUCTURE TO ENHANCE BOTH THE OPERATIONAL PERFORMANCE AND METALLURGICAL QUALITY OF IRON ORE PELLETS.

Keywords

basket test in HYL ZR, microstructure of pellets, reducibility, SEM/EBSD

basket test in HYL ZR, microstructure of pellets, reducibility, SEM/EBSD