Banca de DEFESA: FRANCISCO DE CASTRO VALENTE NETO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FRANCISCO DE CASTRO VALENTE NETO
DATE: 20/12/2022
TIME: 09:00
LOCAL: Sala 702 CEFET/MG Campus Araxá/Microsft Teams
TITLE:

MAGNETIC WASTE INCORPORATION INTO ACTIVATED ALCALI MATERIALS

KEY WORDS:

Magnetite; Slag; Aggregate alkali

PAGES: 49
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Metalurgia Extrativa
SPECIALTY: Tratamento de Minérios
SUMMARY:

It is common knowledge that the cement industry is one of the largest producers of CO2 on the planet, starting from the burning of fuel (coal, fuel oil or gas) and the transformation of calcium carbonate into calcium oxide in the formulation of clinker, Portland cement. common. In this way, several studies are carried out to investigate the reduction and/or replacement of this cement, one of them is the alkali activation process of specific materials for the formation of a compound with agglomerating properties. In addition, there is another environmental problem resulting from the tailings generated by mining, which are usually deposited in dams. One of these wastes is magnetic waste, which basically consists of the mineral magnetite, and which, to date, no technical and economic way has been found for its use. Therefore, this work aims to incorporate the magnetic waste in alkali-activated materials in order to study the physical and mechanical behavior of these compounds. For this purpose, magnetic tailings were used, originating from the processing of phosphate ore from a mine in Goiás, and blast furnace slag from the production of pig iron was used as a precursor. The magnetic waste, as it was received, was dried in an oven and sieved. The blast furnace slag was received already dry and sieved. All these materials were characterized by X-Ray Diffraction (XRD), X-Ray Fluorescence (FRX). The blast furnace slag was activated with sodium hydroxide PA. Specimens measuring 25 mm in diameter and 50 mm in height were made with activated alkali slag only (REF), with activated alkali slag and sand (EA) and with activated alkali slag and magnetic waste (ERM). The curing period was 7 and 28 days, from which tests were carried out on compressive strength, water absorption, and sulfuric acid attack. It was verified that the magnetic waste contributed positively to the studied mechanical properties. In this way, it is expected to contribute to a better understanding of the behavior of this type of composite.

BANKING MEMBERS:
Presidente - DOMINGOS SAVIO DE RESENDE
Interno - ALEXANDER MARTIN SILVEIRA GIMENEZ
Interna - MARCELA MAIRA NASCIMENTO DE SOUZA SOARES
Externo ao Programa - AUGUSTO CESAR DA SILVA BEZERRA
Externo à Instituição - ANTONIO MARIA CLARET GOUVEIA