Banca de DEFESA: ISADORA FERREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ISADORA FERREIRA
DATE: 29/02/2024
TIME: 08:30
LOCAL: Virtual
TITLE:

STUDY OF THE USE OF INPUTS IN THE IRON ORE PELLETIZING PROCESS

KEY WORDS:

Iron Ore; Pellet Feed; Pelletizing; Inputs

PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia de Minas
SUBÁREA: Tratamento de Minérios
SPECIALTY: Equipamentos de Beneficiamento de Minérios
SUMMARY:

Pelletizing is the main process for agglomerating iron ore fines, but with the reduction in reserves of high quality iron ore, the growing generation of ultrafines and the need to increase productivity, there is a need for constant updating and the search for process improvements. Thus, the main purpose of the project was to investigate the influence of inputs on the pelletization of iron ore, in addition to combining the use of inputs, analysis of content, oxide concentration, strength and moisture of the final pellets. The aim of the research was to optimize agglomeration with the chosen inputs, seeking the best results by comparing them according to each test carried out. To this end, samples of pellet feed (divided into lots 1, 2 and 3) from the company Herculano Mineração, Itabirito-MG, bentonite, calcitic limestone, dolomitic limestone and coke made available by the company Vallourec, Nova Lima-MG, were used. As for the tests, the samples were chemically and granulometrically characterized, bench tests were carried out in the ore treatment laboratory at PUC/MG Coração Eucarístico, the pelletizing process was carried out on a CDC pelletizing plate, the pellet moisture content was determined and a drop test was carried out to determine the mechanical resistance to dropping. The pellet feed samples have an average iron content of approximately 64%. The batches achieved PCC percentages close to the target of 3.56%; 3.84%; 4.19%, respectively, and 100% grain size below 150 μm. The product, the raw pellets, had a moisture content of 8% and an average drop resistance value of 1.18 ± 0.06 kgf/pellet (2 drops to crack). The pellets from batch 1, using calcitic limestone, had a higher percentage of CaO, an increase in the percentage of Fe and a Fe₂O₃ content of approximately 93%, and this batch was the one that interacted best with the binder. With regard to basicity, batches 1 and 2 obtained an index between 0.06 and 0.08, i.e. considered acidic, and batch three, because it used both fluxes together, had an increase in the concentration of calcium oxide, and reached a percentage of 0.19%, considered low basicity pellets, all of which are used in direct reduction for the production of sponge iron.

COMMITTEE MEMBERS:
Presidente - FABIO DE SAO JOSE
Interno - ALEXANDER MARTIN SILVEIRA GIMENEZ
Externo à Instituição - DANIEL GERALDO DA CRUZ - UFOP