Banca de DEFESA: ANA CLÁUDIA PAIVA DE SANTIAGO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANA CLÁUDIA PAIVA DE SANTIAGO
DATE: 19/04/2023
TIME: 19:40
LOCAL: remoto
TITLE:

RECOVERY OF Mn TAILINGS FROM THE AMAZON MINERAL INDUSTRY FROM ACID LEACHING

KEY WORDS:

Amazon, waste mining, Mn recovering, value-added products, Mn salts.

PAGES: 50
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Química Inorgânica
SUMMARY:

The present work presents a simple and low-cost way to recover Mn from Mn oxide tailings from the Amazon in the form of Mn salts, especially Mn acetate, oxalate and sulfate. These inorganic compounds call attention due to their wide application as a precursor of Mn oxides (MnO, Mn2O3, and Mn3O4) and in strategic areas such as fertilizer and catalysis. For this, the acid leaching route was used (acetic, sulfuric and oxalic acid) accompanied by hydrothermal treatment at low temperature. The monitoring of the process of obtaining and purifying the salts was carried out using the techniques of X-ray diffraction (DRX), Fourier transform infrared spectroscopy (FTIR), thermal analysis (TG-DTG-DSC) and scanning electron microscopy (SEM). The results showed that the Mn oxide tailings were formed by iron oxide minerals (hematite), aluminum hydroxide (gibbsite), clay minerals (kaolinite and muscovite) and manganese oxyhydroxides (lithiophorite and birnessite), and that after the chemical transformation processes employed, they were successfully converted without impurities into the Mn phases (CH₃COO)₂·4H₂O, MnC₂O₄•2H₂O and MnSO₄, thus indicating that value-added products can be synthesized from Mn waste from the Amazon.

COMMITTEE MEMBERS:
Presidente - 2142681 - BRUNO APOLO MIRANDA FIGUEIRA
Externo ao Programa - 1549200 - LUCINEWTON SILVA DE MOURA - UFOPAExterno à Instituição - ALCY FAVACHO RIBEIRO - UFPA