Pyrite dissolution in acidic media

Redox reaction of aqueous selenite with As-rich pyrite from Jiguanshan ore mine (China): Reaction products and pathway

“…These facts are consistent with the reduction of Se(IV) to Se(0) (Kang et al, 2011 (Fig. 4) Descostes et al (2004) reported values ranging from 1.25 at pH 1.5 to 1.6 at pH 3, while Kamei and Ohmoto (2000) obtained values in the range 0.93-2.00 for the same reaction at pH 5.7 ± 0.3.…”

“…These values are close to the amounts of total aqueous sulfur detected at these pH values (0.146, 0.201, and 0.203 mmol, respectively). Many authors reported sulfur deficit during pyrite dissolution (Descostes et al, 2004;Kamei and Ohmoto, 2000;Paschka and Dzombak, 2004 (Fig. 5), indicating an additional release of sulfur.…”

“…The kinetics and mechanism of pyrite oxidation are of great concern in geochemistry and environmental science research, because of its main role in acid mine drainage (AMD) (Moses and Herman, 1991;Williamson and Rimstidt, 1994;Descostes et al, 2004). In addition to sulfate, elemental sulfur was also observed as an endproduct of pyrite oxidation (Sasaki et al, 1995).…”

Oxidación de sulfuros en pizarra ornamental: tratamientos protectores con siloxanos

“…A number of studies have been made of sulphide oxidation mechanisms, whether from a theoretical (5)(6)(7) or practical perspective; among the latter are studies, aimed at minimizing the risk implied by acid rain, that assessed the effectiveness of different compounds in halting sulphide oxidation in laboratory conditions (8)(9)(10)(11)(12). Although these studies are an excellent knowledge base for tackling research into anti-corrosion agents for roofing slate, they are lacking in terms of an applied focus aimed at optimizing sulphide anti-corrosion processes in the production plant.…”

Polythionate formation during uranium recovery from sulphide flotation concentrate

“…However, it has been shown by a number of researchers (Druschel and Borda, 2006;Descostes, Vitorge, and Beaucaire, 2004) that metastable sulphur species can be formed by FeS 2 oxidation;…”