Abstract
This paper is a result of research work carried out with three different phosphate ore types (SCO - standard calcitc ore, PCO - phlogopite carbonatic ore, and OCO - olivine carbonatic ore), all of them present on Morro da Mina carbonatic phosphate deposit, exploited by Serrana S.A. de Mineração, Jacupiranga, São Paulo, Brazil. The PCO and OCO types show a refractory behaviour whith respect to flotation. Characterization studies on this three ores were performed, firstly, to understand the reasons for poor flotation performance observed for the two refractory ores. From the characterization programme it was possible to propose and test alternate reagent schemes to treat each of the refractory ores. The major parameters investigated during the characterization programme included surface heterogeneity, collector response and solubility determination. Batch scale flotation tests were performed to investigate the new reagent schemes. These new process routes encompassed the use of different modifier agents for the PCO type and the application of an ancillary non-ionic collector to treat the OCO ore type.
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