Studies on the mechanism and kinetics of bioleaching

Breed, A.W.; Hansford, G.S.

doi:10.1016/s0892-6875(99)00018-7

Cited by 26 publications

(15 citation statements)

References 5 publications

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“…This species catalyzes the oxidation of sulfur and/or metal, which in turn leads to the solubilization of copper (Colmer and Hinkle, 1947). Several studies confirm that the rates and mechanisms of the oxidation in the presence of T. ferrooxidans (e.g., Breed and Hansford, 1999;Hansford and Vargas, 2001;Crundell, 2003) affect the release of copper in industrial leach pad environments and enhance the copper yields. Singer and Stumm (1968) suggests that the rate-determining step of pyrite oxidation is oxidation of ferrous to ferric iron in solution under low pH conditions.…”

Section: Chemistry Of Leachingmentioning

confidence: 99%

Cu isotopic fractionation in the supergene environment with and without bacteria

Mathur

Ruíz

Titley

et al. 2005

Geochimica et Cosmochimica Acta

241

160

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Section: Chemistry Of Leachingmentioning

confidence: 99%

Cu isotopic fractionation in the supergene environment with and without bacteria

Mathur

Ruíz

Titley

et al. 2005

Geochimica et Cosmochimica Acta

241

160

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“…TFe and As concentration: A number of studies confirmed the precipitation of Fe and As, thus the Fe and As in bioleaching solution was not the all of the Fe and As dissolved by bioleaching. The Fe and As concentration, however, was strictly related to the activity of bacterial [9][10][11][12]7 . In our work, for the column 3 only at the 12 th , 48 th and 102 nd day, part of the leaching solution was replaced.…”

Section: Eh1mentioning

confidence: 92%

Heap Bioleaching of Refractory Arsenic Gold Concentrates

Dong-hui¹,

He²,

Li³

2013

Asian J. Chem.

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Since biooxidation has been used in pretreatment of refractory sulfidic gold ores, a few techniques and patent have been developed for this process, such as BIOX, BacTech, MINBAC, BIONC, bio-leaching 1,2. The main leaching processes include agitated tank bioleaching and heap bioleaching. The former process is aimed at the refractory gold concentrate and is in two stages. In the first of bioleaching stage, the sulfide mineral is decomposed partly by bioleaching and in the second or leaching gold stage, the CIP (carbon-in-pump) or RIP (resin-in-pump) is applied. Application of this process results in higher extraction, but also has higher investment and costs. Tank bioleaching is not generally economical for use on low-grade concentrate, or for small projects which can not support a high capital investment. Heap bioleaching, which has a low investments and costs aimed generally at refractory and low-grade raw gold ores, has already been successfully applied on ores from some mine, but research on low-grade gold concentrate has seldom been done previously 3. The only process, known as GEOCOAT, had been developed to treat concentrate which is coated onto a crushed and sized carrier rock 1,4. The main objective of the present study reported here was to investigate the possibility of pretreating refractory low-grade gold concentrate by heap bioleaching with the agglomerated sample.

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“…Various other microorganisms, viz. Thiobacillus ferrooxidans, Aspergillus niger, Penicillium strain, Sulfooxidan strains (Gupta and Ehrlich, 1989;Abbruzzesi et al, 1990;Baglin et al, 1992;Vegilo, 1996;Breed and Hansford, 1999), have been proved to be successful for bioleaching of manganese. But the studies on bioleaching of manganese by T. thiooxidans are limited (Porro et al, 1990).…”

Section: Batch Studies On Bioleaching Of Manganese Tailingsmentioning

confidence: 99%

Biokinetics of Thiobacillus thiooxidans for manganese bioleaching

Lodha¹,

Badhane²,

Srivastava³

et al. 2010

IJEP

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The waste tailing of metals generated during mining processes is degrading the environment by increasing the soil toxicity, leading to disturbances in the ecosystem. This study was initiated to determine the biokinetics of Thiobacillus thiooxidans for manganese bioleaching in the presence of excess sulphur. In batch studies, the effect of manganese concentration on the leaching efficiency of T. thiooxidans was also evaluated, and it was found that as the concentration of manganese increases, the leaching efficiency decreases. This may be due to an inhibitory effect of manganese at higher concentrations. The maximum leaching efficiency of more than 95% was found at lower manganese concentration of 5-25 mg/litre, while the efficiency significantly decreases to 35% at 200 mg/litre manganese. The biokinetic coefficient (maximum growth rate and inhibition constant) was also determined for T. thiooxidans for manganese bioleaching using Haldane's equation. A linear mathematical relationship was also developed between leaching efficiency, initial manganese concentration and time of incubation, which would be useful in predicting the leaching efficiency under various conditions. The significance test using T-paired test was also performed, and it was found that the theoretical leaching efficiency is above 95% confidence level from observed leaching efficiency. The above parameters are invariably required for the design and simulation of batch and continuous bioreactors for bioleaching of manganese tailings. The present work may be useful for management of tailing waste generated during mining processes.

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Studies on the mechanism and kinetics of bioleaching

Cited by 26 publications

References 5 publications

Cu isotopic fractionation in the supergene environment with and without bacteria

Cu isotopic fractionation in the supergene environment with and without bacteria

Heap Bioleaching of Refractory Arsenic Gold Concentrates

Biokinetics of Thiobacillus thiooxidans for manganese bioleaching

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