ESTUDO FLUIDODINÂMICO E CINÉTICO DA USTULAÇÃO DE CONCENTRADOS DE SULFETO DE ZINCO EM REATOR DE LEITO FLUIDIZADO / FLUID DYNAMICS AND KINETICS STUDY OF ZINC SULPHIDE CONCENTRATES ROASTING IN FLUIDIZED BED REACTOR

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

This work presents a fluid dynamics and kinetics study of the roasting of zinc sulphide concentrates at 950¢XC. The data were collected in the literature for experiments carried out in an industrial fluidised bed reactor with an excess of oxygen. The theoretical and experimental characterisation was conducted with the operating variables of the industrial reactor. Theoretical fluid dynamic diagrams (Geldart, Schytill and Grace) were drawn for the industrial practice at certain conditions. It was observed that, with changing temperature, mean particle diameter, gas superficial velocity and reactor size, the boundaries of the diagrams were affected. MathcadÆË programs to characterise the bed behaviour are presented. The kinetics was studied to evaluate the influences of the following parameters: temperature, O2 partial pressure, particle size, gas and particle densities, and gas viscosity on the conversion of ZnS to ZnO. The results effectively demonstrate that, for the oxygen enrichment employed, the conversions increased in approximately 15%. Therefore, the oxygen enrichment is an advisable alternative to increase the efficiency of ZnS concentrates roasting in fluidised bed reactors.

ASSUNTO(S)

fluidizacao diagramas fluidodinamicos ustulacao de sulfetos fluidization regimes regimes de fluidizacao fluid dynamics diagrams fluidization roasting of sulphides

ACESSO AO ARTIGO

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