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DYNA

versão impressa ISSN 0012-7353

Resumo

TAMAYO, LILIANA MARCELA et al. PHYSICOCHEMICAL CHARACTERIZATION OF ACCRETIONS IN A FLUIDIZED BED FURNACE FOR THE ROASTING OF BLENDE. Dyna rev.fac.nac.minas [online]. 2012, vol.79, n.175, pp.90-96. ISSN 0012-7353.

This study has of central aim to establish the physicochemical characteristics of the accretions present in an industrial furnace of sphalerite roasting (ZnS) operating at 945 ° C which, according to observations on plant, they are formed preferentially on surfaces at low temperature such as boiler output, cooling pipes and hoppers. The analysis by X-Ray Diffraction, Atomic Absorption, and Image Analysis showed that the main components of these deposits are zinc sulfate, lead sulfate and zinc ferrite. A thermodynamic analysis based on the construction of stability diagrams for the system Zn-Fe-Pb/SO2(g)-O2 (g) with XZn ≥ 0,5 (this is, XFe = 0,125 XPb = 0,015) between 300 to 900 º C, confirms the strong presence of ZnSO4, Fe2(SO4)3 , PbSO4 and ZnFe2O4 under reactor operating conditions of roasting, validating this analysis with experimental observations.

Palavras-chave : Accretion; Kellogg-Bassú diagram; Sulfates; Roasting of Blende.

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