Banca de QUALIFICAÇÃO: FRANCISCO DE CASTRO VALENTE NETO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : FRANCISCO DE CASTRO VALENTE NETO
DATE: 17/12/2021
TIME: 14:00
LOCAL: Sala Microsoft Teams
TITLE:

Special properties of alkali activated materials with added magnetic tailings

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 well known 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. Thus, several studies are carried out to investigate the reduction and/or replacement of this cement, one of which is the alkali activation process of specific materials for the formation of a compound with binding properties. In addition, we have another environmental problem, which is the tailings generated by mining, which are normally deposited in dams. One of these wastes is the magnetic one, which until today has not found a technical and economical way for its use. Therefore, this work aims to incorporate magnetic tailings in activated alkali materials in order to study the behavior of electrical and thermal properties in these compounds. For this, we will use magnetic tailings, originating from the processing of phosphate ore from a mine in Goiás, and as material to be activated alkali, we will use blast furnace slag from a pig iron. The magnetic tailings, as received, were sieved and the pass through the 100# sieve will be used, below 0.149 mm. The same procedure will be carried out with the blast furnace slag. All these materials were characterized by X-Ray Diffraction (XRD), X-Ray Fluorescence (FRX) and Scanning Electron Microscopy (SEM). Blast furnace slag will be activated with PA sodium hydroxide. Test specimens measuring 25 mm in diameter and 5 cm in height will only be made with activated alkali slag and with 10%, 20% and 30% of magnetic waste. The curing period will be between 7 and 28 days, after which tests for compressive strength, water absorption, sulfuric acid attack, electrical conductivity and refractibility will be carried out. 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
Externo ao Programa - AUGUSTO CESAR DA SILVA BEZERRA