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vol.64 issue1Dry comminution of quartz and dolomite mixturesConcentration by apatite flotation originating from carbonatically affiliated rocks author indexsubject indexarticles search
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Rem: Revista Escola de Minas

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PEREIRA, Carlos Alberto; ZORZAL, Caroline Belisário; COELHO, Lucas Carvalho  and  OLIVEIRA, Michelly dos Santos. Depressants for dolomites in willemite flotation. Rem: Rev. Esc. Minas [online]. 2011, vol.64, n.1, pp.105-109. ISSN 0370-4467.

This research addressed the effects of depressants on willemite flotation, in order to increase both zinc recovery and selectivity. The reagents were: an amine emulsion (Clariant Flotigan 2835-2L), diesel oil and MIBIC in the proportions of 1.0, 0.16 and 0.4 as the collector and frother; a sodium sulfide and sodium carbonate solution as the activator and pH modifier, respectively; sodium silicate as the dispersant agent; and as the depressant: sodium silicate, dextrin, potassium dichromate, tannin, starch and carboxymethylcellulose (CMC). The steps of dispersion, sulfidization and willemite flotation were investigated. This work was conducted on laboratory scale and showed, among other findings, that a good performance could be obtained using carboxymethylcellulose and starch as a dolomitic gangue depressant in the flotation of willemite zinc ore.

Keywords : Willemite flotation; depressants; dolomite.

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