Role of applied potentials on bioleaching of chalcopyrite concentrate and growth of Acidithiobacillus ferrooxidans

Natarajan, K.A.; Kumari, Abha

doi:10.1007/bf03402473

Cited by 1 publication

(2 citation statements)

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Section: Resultsmentioning

confidence: 99%

“…The presence of micro-organisms is known to increase or decrease pyrite oxidation, depending on the type of bacteria (e.g., iron-oxidizing and sulfate-reducing) residing within AMD wastes. 1,58−60 It has been reported that the rest potentials of sulfide minerals (e.g., pyrite and galena) measured in solutions in the presence or absence of catalyzing micro-organisms vary significantly, 61,62 thus affecting the magnitude of galvanic interaction. Jyothi et al 62 observed that galvanic currents and combination potentials for several bi-sulfide systems (e.g., pyrite−chalcopyrite and pyrite−sphalerite) differed between inoculated (treated with bacteria) and uninoculated systems and that the sulfide dissolution kinetics also varied.…”

Section: Pyrite Onlymentioning

confidence: 99%

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The Combined Effects of Galvanic Interaction and Silicate Addition on the Oxidative Dissolution of Pyrite: Implications for Acid and Metalliferous Drainage Control

Qian

Fan

Short

et al. 2019

Environ. Sci. Technol.

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The aim of this study was to determine the combined effect of galvanic interaction and silicate addition on the dissolution of pyrite, the major contributor to acid and metalliferous drainage (AMD). Single (pyrite, sphalerite, and galena)- and bi-sulfide (pyrite–sphalerite and pyrite–galena) batch dissolution experiments were carried out with addition of 0.8 mM dissolved silicate for comparison to previously published data. The pyrite dissolution rate was reduced by 98% upon silicate addition at pH 7.4 with little effect at pH 3.0 and 5.0. The effect of galvanic interaction on reducing pyrite dissolution decreased with increasing pH and was greater in the presence of sphalerite than galena. In contrast, the effect of silicate addition increased with increasing pH and was greater in the presence of galena than sphalerite. The greatest combined effect was at pH 7.4, with <0.1% of pyrite leached in both bi-sulfide systems. Silicate addition also significantly reduced the dissolution of sphalerite or galena (by 10–44%, except at pH 3 for the pyrite–sphalerite system). These results suggest that silicate addition, for reducing both pyrite dissolution and metalliferous drainage, may be applicable at a broad pH in mixed sulfide systems.

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