Quantitative X-Ray Phase Analysis as a Method of Control of Iron Blende Roasting Process

Mariusz Staszewski; Piotr Kapias; Katarzyna Bilewska; Małgorzata Kamińska; Małgorzata Osadnik

doi:10.4028/www.scientific.net/SSP.203-204.156

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Quantitative X-Ray Phase Analysis as a Method of Control of Iron Blende Roasting Process
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Quantitative X-Ray Phase Analysis as a Method of Control of Iron Blende Roasting Process

Abstract:

During the process of leaching of roasted ore from fluidized-bed furnace a decrease of zinc (as ZnO) recovery was observed. Within the investigations a comprehensive structural analysis of samples from the process of roasting of zinc concentrates has been made. It has been found that one of the essential causes for zinc recovery decrease is a presence of (Zn,Fe)S sulphide in the ore, instead of pure zinc blende ZnS. Subsequently, (Zn,Fe)S iron blende is oxidized not to ZnO, but to a mixture where the main component is mixed (Zn,Fe)Fe₂O₄ oxide. Such oxide does not decompose into simple oxides during the process, which leads to a decrease of zinc recovery.