Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 2    February 2013

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Bioleaching and electrochemical property of marmatite by Leptospirillum ferrooxidans
Jin-rong BAN, Guo-hua GU, Ke-ting HU

School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

Abstract:The effects of several variables on the bioleaching of marmatite with pure L. ferrooxidans were investigated. The results show that zinc extraction increases with the decrease of pulp density. Adjusting pH to1.6 during the bioleaching process has a positive effect to the dissolution of marmatite. External addition of Fe3+ ions accelerates the bioleaching, while the concentration of additional Fe3+ over 2.5 g/L weakens the acceleration effect due to the inhibition effect on bacteria growth and the promotion of jarosite production. The electrochemical measurements were used to make further understanding on the dissolution of marmatite with and without additional Fe3+ in the presence of L. ferrooxidans. The experimental data illustrate that additional Fe3+ ions could increase the corrosion current density, which is favorable to zinc extraction. The EIS spectra show that rate-limiting step does not change when Fe3+ is added.

 

Key words: bioleaching; marmatite; electrochemical measurements; L. ferrooxidans

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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