Rem: Revista Escola de Minas
Print version ISSN 0370-4467
PAIVA, Paulo Renato Perdigão; MONTE, Marisa Bezerra de Mello and GASPAR, José Carlos. Concentration by apatite flotation originating from carbonatically affiliated rocks. Rem: Rev. Esc. Minas [online]. 2011, vol.64, n.1, pp. 111-116. ISSN 0370-4467. http://dx.doi.org/10.1590/S0370-44672011000100015.
The current processing study seeks to improve operations for the direct and reverse flotation of apatite originating from carbonatically-affiliated rocks to obtain an apatite concentrate in accordance with the phosphoric acid industry specifications. The direct flotation of apatite was carried out in two flotation phases, rougher and cleaner. The aim of direct flotation was to generate a product to feed the reverse flotation circuit of apatite. Reverse flotation was performed in three stages (rougher, cleaner and recleaner) and at pH 5.0, using phosphoric acid (H3PO4) as an apatite depressor. Summing up, the results of reverse flotation tests pointed out apatite recovery, which shows that the specific reagents used favored system selectivity. It was possible to obtain an apatite concentrate with 38.11% of P2O5, 50.98% of CaO, 1.07% of Fe2O3, 0.67% of MgO and ratio CaO/ P2O5 of 1.34.
Keywords : Flotation; silicon-carbonate ore; carbonates; apatite; phosphoric acid.