Resumo

HU, T. et al. Response surface optimization of process parameters for the removal of F and Cl from zinc oxide fume by microwave sulphating roasting. J. S. Afr. Inst. Min. Metall. [online]. 2016, vol.116, n.1, pp.35-42. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2016/v116n1a6.

Microwave sulphating roasting was applied to zinc oxide fume from a fuming furnace for the removal of F and Cl. The effect of important parameters such as roasting temperature, holding time. and vapour flow were investigated and the process conditions were optimized using response surface methodology. The results showed that the effects of roasting temperature and holding time on the removal efficiency of F and Cl were most significant, and the effect of vapour flow is of much lower importance. The defluorination and dechlorination efficiency increased rapidly as the roasting temperature and holding time increased, while the vapour flow had little effect. The defluorination efficiency could reach 91.3% while the dechlorination efficiency could reach 89.5%, under the process conditions of roasting temperature 655°C, holding time 65.2 minutes, and vapour flow of 6.8 ml/min. The results showed that the removal of F and Cl from zinc oxide fume using a microwave direct roasting process is feasible and reliable.

Palavras-chave : zinc oxide fume; microwave sulphating roast; removal of F and Cl; response surface methodology.

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