Journal
MINERALS ENGINEERING
Volume 75, Issue -, Pages 63-69Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2014.12.022
Keywords
Hematite; Flotation bioreagents; Rhodococcus ruber
Funding
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- VALE
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
- FAPERJ (Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro)
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Previous research showed the effectiveness of bacterial strains as flotation reagents on Hematite beneficiation. The aim of this work is to study and evaluate Rhodococcus ruber as a biocollector. The sample was conditioned with the biomass suspension by stirring under specific conditions as particle size, biomass concentration, pH solution and conditioning time. The results showed a change in hematite zeta potential profile after interaction with R. ruber, and its adhesion onto the mineral surface was higher at pH 3 and at concentration of 0.60 g/L (10(9) cells/mL). Flotation studies were carried out in a 0.23 L modified Partridge-Smith cell flotation, and the highest floatability (84%) was achieved at size fraction -53 mu m +38 mu m under the conditions mentioned before. Complementary floatability studies were performed using the conventional frother Flotanol D24 combined with the R. ruber biomass, finding interesting results for the bigger particle size range. Thus, this research aims to evaluate the efficiency of bioflotation of minerals, particularly hematite, and the potential use of R. ruber as biocollector, projecting its future application in mineral flotation industry. (C) 2014 Elsevier Ltd. All rights reserved.
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