We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
REMOVAL OF IRON-BEARING MINERALS FROM GIBBSITIC BAUXITE BY DIRECT FROTH FLOTATION.
- Authors
de Melo Barbosa, Felipe; Guimarães Bergerman, Maurício; Gomes Horta, Daniela
- Abstract
The refractory bauxite needs to present less than 2.5% of Fe2O3 to be applied in the ceramics industry. The depletion of high Al2O3 grade deposits has stimulated the improvement of bauxite concentration methods in order to remove iron-bearing minerals. The objective of this study was to evaluate the influence of collector dosage, pH and milling time on the gibbsite flotation performance. Firstly, the sample mineralogical composition was determined by means of X-ray diffraction (XRD) and binocular loupe analysis. X-ray fluorescence (XRF) analysis was used to determine the sample chemical composition. Flotation was then accomplished by using hydroxamate as gibbsite collector, sodium silicate as silicate depressant and starch as iron-bearing minerals depressant. The bauxite Fe2O3 content was reduced from 7.66% to 4.81-5.03%. In addition, the flotation performance decreased by diminishing the pH from 9.5 to 8.5 or increasing the pH to 10.5. The milling time influence on the flotation indicates that the presence of slime can significantly affect the gibbsite concentration.
- Subjects
BAUXITE; MINERALOGY; FLOTATION
- Publication
Tecnologia em Metalurgia, Materiais e Mineração, 2016, Vol 13, Issue 1, p106
- ISSN
2176-1515
- Publication type
Article
- DOI
10.4322/2176-1523.0924