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HEAVY NON-FERROUS METALS
ArticleName Composition of the solid products of oxidizing roasting of non-ferrous metal sulfide ore concentrates: comparative analysis
DOI 10.17580/tsm.2018.11.04
ArticleAuthor Savinova Yu. A., Tsemekhman L. Sh., Popov V. A.
ArticleAuthorData

Gipronikel Institute, Saint Petersburg, Russia:

Yu. A. Savinova, Research Fellow at the Pyrometallurgy Laboratory
L. Sh. Tsemekhman, Adviser to General Director, e-mail: lev.tsem1@gmail.com
V. A. Popov, Lead Researcher at the Pyrometallurgy Laboratory

Abstract

As part of the work to develop efficient processing regimes for copper, coppernickel and polymetallic sulfide concentrates, a series of experiments was carried out in which the above materials were roasted in fluid-bed furnaces. The roasting experiments were conducted in a laboratory in a wide range of parameters: temperature — from 500 to 950 oC; blast medium — from air to 35 % oxygen-air mixture; roasting time — 30 min to 2 h. The resultant roasted product was analysed by local methods of scanning electron microscopy and X-ray spectral microanalysis. It was established that, irrespective of the roasting parameters, all products obtained during the experiments have similar groups of components. Key components include: relict sulfides, oxides, sulfates and spinels (ferrites). At the same time, a clear correlation was identified between the composition of the roasted products and the roasting process parameters. Within the studied range of roasting conditions, a temperature rise, as well as a higher concentration of oxygen in the blast air, is associated with a greater number of oxidized components (i. e. oxides and ferrites) in the products and a lower volume concentration of sulfides and sulfites. The authors conducted a thermodynamic analysis of sulfide polymetallic concentrate subjected to fluid-bed roasting. The same component groups were found in the roasted product as the ones that were identified in real products through SEM and XRS. The obtained data provide a basis for analyzing if there is an equilibrium between oxidizing processes in the fluid-bed roasting of sulfide concentrates.

keywords Sulfide ore concentrate, oxidizing roasting, fluid-bed furnace, equilibrium, thermodynamic analysis, roasted product, composition, spinels, sulfates, scanning electron microscopy, X-ray spectral microanalysis
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