Banca de DEFESA: MARINA MARTINS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARINA MARTINS
DATE: 31/10/2022
TIME: 18:00
LOCAL: https://teams.microsoft.com/l/team/19%3akW6oEc6yRxwQlY-hPQj-CY4vfeMCKfM3x9jBP-WXwqc1%40thread.tacv2/
TITLE:

EFFECT OF FLOCCULANTS IN THE SEDIMENTATION AND RHEOLOGY OF IRON ORE TAILING SLURRYS

KEY WORDS:

Rheology; dewatering; Flocculation; tailings

PAGES: 102
BIG AREA: Engenharias
AREA: Engenharia de Minas
SUBÁREA: Tratamento de Minérios
SPECIALTY: Métodos de Concentração e Enriquecimento de Minérios
SUMMARY:

The storage of tailings in the form of diluted pulp has been a critical issue for a mineral, as tailings dams are difficult and costly to monitor. In view of this, the dewatering of the tailings becomes an alternative so that the dams can contain smaller volumes of water. Thickening is the main process for dewatering the tailings, and the use of flocculants at this stage is essential so that the fine particles can settle more efficiently. This work aimed to evaluate the influence of different flocculants on the dewatering and rheology of an iron ore tailings. For this, sedimentation tests were carried out in proof in order to obtain the sedimentation velocity, turbidity of the clarified and % of solids in the underflow. To evaluate the influence of the reagents on the rheology of the material, rheological slump tests were carried out in a rotational rheometer. The accumulated reagents were polyacrylamides from the Magnafloc, Alclar and Rheomax lines from BASF and also a residual potato starch. The results showed that the reagents positively interfered in the sedimentation and rheology of the tailings. Among the improved synthetic reagents, Rheo 1050 at a dosage of 30g/t was the one that clarified the best results with a maximum sedimentation velocity of 0.76 cm/s, a minimum turbidity of 60.5N and 53.75% solids. no underflow. The maximum yield stress of the tailings slurry, 141 Pa, was also achieved for this same reagent and in the mass concentration of solids of 75%, classifying the thickened tailings as high density waste.

BANKING MEMBERS:
Presidente - MICHELLY DOS SANTOS OLIVEIRA
Interno - NATAL JUNIO PIRES
Externo à Instituição - FRANCISCO GREGIANIN TESTA
Externa à Instituição - SILVIA CRISTINA ALVES FRANÇA