Mineralogical Changes Occurring during the Fluid-Bed Roasting of Zinc Sulfide Concentrates

JOM | December 1, 2004| | Copyright

During the fluid-bed roasting of zinc sulfide concentrates, the sulfur in the sphalerite (Zn, Fe)S diffuses out of the particles, whereas the associated zinc and iron are converted to (Zn, Fe)O. The iron from the (Zn,Fe)O phase migrates outward to the peripheries of the particles, forming ZnFe^sub 2^O^sub 4^. The resulting porous ZnO+ZnFe^sub 2^O^sub 4^ particles agglomerate to form large, spherical masses. A compact shell subsequently develops on the surface of the agglomerates and continues to grow inward; eventually, the particles become compact. Rhythmic bands consisting of intergrowths ...

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