The role of phenols from bagasse vacuum pyrolysis bio-oil in cupper sulfured ore flotation

AUTOR(ES)

Brossard, L. E., Beraldo, A. L., Cortez, L. A. B., Brossard Jr, L. E., Maury, E. D., Brossard, C. O.

FONTE

Brazilian Journal of Chemical Engineering

DATA DE PUBLICAÇÃO

2008-12

RESUMO

Vacuum pyrolysis bagasse bio-oil collected in a series of sequential fractions was analyzed for total percentage of phenols and levoglucosan components. It was established that the ratio total phenols- to-levoglucosan could be used as an indicator of the performance of alkaline solutions of bio-oil fractions (SABO) when they are used as foaming agents to benefit flotation of sulfured cupper minerals. A high total phenol-to-levoglucosan ratio results in high percentages of Cu in cupper flotation concentrates, L Cu. A closer look at the role of individual phenols reveals that p-cresol is the main phenol, although not the only one, responsible for the observed behavior. Additionally it was noted that rather high doses of these foaming agents must be used to obtain desirable results in flotation processes. A production cost estimate allows consideration of SABO as an alternative to others commercial foaming agents, especially if an optimization study reduces doses of SABO.

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