Prevention of Pyrite Dissolution in Acidic Media

A review on pyrrhotite oxidation

“…Pyrrhotite can be stabilized in combination with a binder (such as cement), neutralizers, bactericides or surfactants to form agglomerates (Amaratunga, 1991;Hmidi and Amaratunga, 1998). It is also suspected that the oxidation of pyrrhotite could be partially or totally inhibited through surface treatments (coating agents) similar to those suggested for pyrite (Lalvani et al, 1990(Lalvani et al, , 1991Belzile et al, 1997b;Lan et al, 2002).…”

New efficient algorithm for solving thermodynamic chemistry

“…Pyrite Ž . FeS , which is the most abundant metal sulfide on Earth, is 2 involved in many processes such as formation of acid mine drainage, redox cycling of metals in sediments, oxic-anoxic boundaries of sediments or estuaries, flotation, and nuclear Ž waste disposals Singer and Stumm, 1970;Morse et al, 1987; Chilakapati, 1999;Lalvani et al, 1991;Bosch, 1999 . It is therefore very important to calculate the FeS oxidation 2 without any convergence problem knowing the complexity of thermodynamic equilibria.…”

Effect of Acidithiobacillus ferrooxidans on Humic-Acid Passivation Layer on Pyrite Surface

“…Bacteria adsorbed on the pyrite surface can promote pyrite oxidation [10][11][12]. Previous studies have shown that humic-acid is readily adsorbed on pyrite surfaces, and forms an effective passivation layer, which prevents pyrite oxidation [13][14][15]. Sorrenti et al reported that humic-acid adsorption on pyrite is irreversible and that the humic-acid can't be removed by washing [14].…”