Banca de DEFESA: MARIA VIRGÍNIA DA CUNHA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARIA VIRGÍNIA DA CUNHA
DATE: 28/10/2022
TIME: 08:30
LOCAL: Sala 702/Teams
TITLE:

EVALUATION OF DISPERSION IN THE SLIDING AND PHOSPHATE ORE FLOTATION

KEY WORDS:

Dispersal. Slimming. Flotation. Phosphate ore.

PAGES: 89
BIG AREA: Engenharias
AREA: Engenharia de Minas
SUBÁREA: Tratamento de Minérios
SPECIALTY: Métodos de Concentração e Enriquecimento de Minérios
SUMMARY:

Deslaming is one of the stages of the processing of phosphatic ore, responsible for the removal of fines and slats. It is known that the presence of fines can cause numerous problems in the flotation stage, such as excessive expenditure of reagents and coating of coarse particles by slime coating. Within this line of reasoning, the present work is justified by the benefits brought by the elimination of very fine particles, which favors the increase of selectivity and the recovery of P₂O₅. The reduction in the amount of reagents followed by increased efficiency of the deslaming stage are also auspicious hypotheses. Furthermore, the purpose of the project is to investigate the influence of dispersion on deslamation and flotation of phosphotic ore, in addition to articulating the comparison of dispersants and pH values, using for this outcome the calculation of the degree of dispersion, global metallurgical recovery, the selectivity ratio and the analysis of content in the deslamation and flotation operation. In this sense, it is expected with this research, the optimization of deslamation and also flotation, seeking better results, through dispersion techniques. To achieve these goals, flotation tests; deslaming combined with flotation; dispersion combined with deslamion and flotation; and dispersion combined with flotation, were produced and verified. For this, a sample of phosphatic ore from a company located in the Alto Paranaíba region, in the state of Minas Gerais, was used. The dispersion tests were performed by means of a dispersion tube and optimized with the aid of the Minitab software. Flotation and deslamation assays were performed in mechanical cells. The use of dispersants proved to be efficient for deslaming because it decreased the value of metallurgical loss. However, dispersants previously added to flotation contributed to increase metallurgical recovery, but only one assay had an increase in P2O5 content. The sodium hexametaphosphate reagent at the dosage of 3000 g/t provided the highest degree of dispersion, but in the bench flotation presented the lowest values of metallurgical recovery and P₂O₅ content. The experiment using sodium silicate, with deslamion and dosage of 3000 g/t, was the best condition for both deslamation and flotation. Finally, when comcing the flotation assay and flotation assay with deslamation (both without adding dispersants), it is observed that despite the decrease in metallurgical recovery, there is an increase in P₂O₅ content and selectivity ratios. These increases may justify the use of deslamation preceding flotation.

BANKING MEMBERS:
Presidente - MICHELLY DOS SANTOS OLIVEIRA
Interno - FABIO DE SAO JOSE
Interno - MARIO GUIMARAES JUNIOR
Externo à Instituição - LUCIANO FERNANDES DE MAGALHAES - UFMG