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Suppression of Pyrite Oxidation by Formation of Iron Hydroxide and Fe(III)-silicate Complex under Highly Oxidizing Condition
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 Title & Authors
Suppression of Pyrite Oxidation by Formation of Iron Hydroxide and Fe(III)-silicate Complex under Highly Oxidizing Condition
Lee, Jin-Soo; Chon, Chul-Min; Kim, Jae-Gon;
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Acid drainage generated by pyrite oxidation has caused the acidification of soil and surface water, the heavy metal contamination and the corrosion of structures in abandoned mine and construction sites. The applicability of Na-acetate (Na-OAc) buffer and/or Na-silicate solution was tested for suppressing pyrite oxidation by reacting pyrite containing rock and treating solution and by analyzing solution chemistry after the reaction. A finely ground Mesozoic andesite containing 10.99% of pyrite and four types of reacting solutions were used in the applicability test: 1) , 2) and Na-silicate, 3) and 0.01M Na-OAc buffer at pH 6.0, and 4) , Na-silicate and 0.01M Na-OAc buffer at pH 6.0. The pH in the solution after the reaction with the andesite sample and the solutions was decreased with increasing the initial concentration but the concentrations of Fe and were increased 10 - 20 times. However, the pH of the solution after the reaction increased and the concentrations of Fe and decreased in the presence of Na-acetate buffer and with increasing Na-silicate concentration at the same concentration. The solution chemistry indicates that Na-OAc buffer and Na-silicate suppress the oxidation of pyrite due to the formation of Fe-hydroxide and Fe-silicate complex and their coating on the pyrite surface. The effect of Na-OAc buffer and Na-silicate on reduction of pyrite oxidation was also confirmed with the surface examination of pyrite using scanning electron microscopy (SEM). The result of this study implies that the treatment of pyrite containing material with the Na-OAc buffer and Na-silicate solution reduces the generation of acid drainage.
Acid drainage;Na-silicate;Na-OAc buffer;Fe-hydroxide;Fe-silicate complex;
 Cited by
Barriga, F.J.A.S. and W.S. Fyfe. 1988. Giant pyretic base-metal deposits: The example of feitais. Chem. Geol. 69:331-342. crossref(new window)

Ericson, P.M., R.L.P. Kleinmann, and S.J. Onysko. 1985. Control of acid mine drainage by application of bactericidal materials. In Control of acid mines information circular 9027.

Fornasiero, D., V. Eijt, and J. Ralston. 1992. An electrokinetic study of pyrite oxidation. Colloids and Surfaces. 62:57-61. crossref(new window)

Ivano, V.I. 1962. Effects of some factors on iron oxidation by cultures of Thiobacillus Ferrooxidants. Microbiology. 31:645-652.

Lee, G.H., J.G. Kim, J.S. Lee, S.K. Park, T.H. Kim, K.S. Ko, and T.W. Kim. 2005. Generation characteristics and prediction of acid rock drainage of cut slope. Econ. Environ. Geol. 38:91-99.

Luther, G.W., J.E., Kostka, T.M. Church, B. Sulzberger, and W. Stumm. 1992. Seasonal iron cycling in the salt-marsh sedimentary environment: the importance of ligand complexes with Fe(II) and Fe(III) in the dissolution of Fe(III) minerals and pyrite, respectively. Marine Chemistry. 40:81-103. crossref(new window)

Moses, C.O. and J. Herman. 1991. Pyrite oxidation at circumneutral pH. Geochim. Cosmochim. Acta. 55:471-482. crossref(new window)

Nicholson, R.V., R.W. Gillham, J.A. Cherry, and E.J. Rearson. 1989. Reduction of acid generation in mine tailings through the use of moisture-retaining cover layers as oxygen barrier. Can. Geotech. J. 26:1-8. crossref(new window)

Olsen, L.L. and C.R. Omelia. 1972. The interaction of Fe(III) with Si(OH)4. J. Inorg. Nucl. Chem. 35:1977-1985.

Porter, R.A. and W.J. Weber. 1971. The interaction of silicic acid with iron(III) and uranyl irons in dilute aqueous solution. Inorg. Nucl. Chem. 33:2443-2449. crossref(new window)

Singer, P.C. and W. Stumm. 1970. Acid mine drainage: rate determining step. Science. 167:1121-1123. crossref(new window)

Stiller, A.H., J.J. Renton, T.E. Rymer, and B.G. McConaghy. 1986. The use of phosphate for ameliorization, in Proceedings Seventh West Virginia Surface Mine Drainage Task Force Symposium, Clarksburg, WV.

Weber, W.J. and W, Stumm. 1965. Formation of a silicateiron(III) complex in dilute aqueous solution. Inorg. Nucl. Chem. 27:237-239. crossref(new window)

Zhang, Y.L. and V.P. Evangelou. 1996. Influence of iron oxide forming conditions on pyrite oxidation. Soil Sci. 161:852-864. crossref(new window)