Application of Mechanochemical Activation Followed by Thermal Treatment for Utilization of Pyrite Concentrates
V. PETKOVA1, B. KUNEV2, D. PANEVA2 and I. MITOV2
1Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences,
Ul. Akademika G. Boncheva, Bl. 107 Sofia 1113 (Bulgaria) E-mail: vilmap@dir.bg
2Institute of Catalysis, Bulgarian Academy of Sciences, Sofia (Bulgaria)
Pages: 301-307
Abstract
The possibilities to utilize pyrite concentrates from Chelopech Region (Bulgaria) were investigated using mechanochemical and thermal methods to obtain soluble iron-containing compounds and to extract useful microelements form the polymetallic ore. Mechanochemical activation was carried out in a planetary mill for 10 h; the resulting solid-phase samples were heated under isothermal conditions at 573 K for 4 h. To estimate mechano and thermochemical effects, Mössbauer spectroscopy, X-ray phase analysis and thermal methods of analysis in the oxidative gas medium were used. It was proved by means of physicochemical methods that phase transformation of pyrite to FeSO4 and a decrease in its ignition temperature by 120 K are possible after triboactivation of pyrite samples.
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