Ferric iron production in packed bed bioreactors: influence of pH, temperature, particle size, bacterial support material and type of air distributor

Mazuelos, Alfonso; Palencia, I.; Romero, R.; Rodríguez, Gustavo; Carranza, Francisco

doi:10.1016/s0892-6875(01)00038-3

Cited by 32 publications

(18 citation statements)

References 9 publications

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“…The oxidation of ferrous to ferric iron results in a higher pH which in turn reduces ferric iron solubility and hence its effect on the chalcopyrite (Gomez and Cantero, 1998;Mazuelos et al, 2001;Rodreguez et al, 2001). This can cause a significant precipitation of iron hydroxide (partly as a layer at the mineral surface) where regenerated ferrous iron is produced (Kinzler et al, 2003;Tributsch, 2001).…”

Section: Effect Of Temperature Adaptation On the Bioleaching Of Chalcmentioning

confidence: 99%

Bioleaching of copper via iron oxidation from chalcopyrite at elevated temperatures

Karimi

Rowson

Hewitt

2010

Food and Bioproducts Processing

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The effect of elevated temperature on the bioleaching of copper from chalcopyrite, (CuFeS 2 ) via iron oxidation using Acidithiobacillus ferrooxidans under mesophilic conditions was studied. It was shown that temperature tolerant and ore adapted strains of At. ferrooxidans could extract copper significantly better than non-adapted cultures at elevated temperatures. The presence of soluble iron and its oxidative state, as a determining factor in copper leaching were found to be closely related to pH and temperature.

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Section: Effect Of Temperature Adaptation On the Bioleaching Of Chalcmentioning

confidence: 99%

Bioleaching of copper via iron oxidation from chalcopyrite at elevated temperatures

Karimi

Rowson

Hewitt

2010

Food and Bioproducts Processing

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“…The bioreactor was set up following the protocol described by Mazuelos et al . using an FNN‐9K inoculum.…”

Section: Methodsmentioning

confidence: 99%

“…Bio‐oxidation can be improved using reactors designed specifically for this purpose. Among the tested designs, the one which has shown the greatest Fe 3+ productivities is the flooded packed bed reactor . In these reactors, cells adhere to the particles of the packed bed forming a bio‐film, and they are fed with liquors containing Fe 2+ and air, which are introduced through the bottom of the reactor and flow upward.…”

Section: Introductionmentioning

confidence: 99%

“…This paper shows the results obtained from studying the effect of Cu 2+ on Fe 2+ bio‐oxidation, with the novelty of experiments being conducted in continuous operation of a packed bed bioreactor with immobilised cells. Using this type of bioreactor, as well as obtaining results about the influence of Cu 2+ on bio‐oxidation in a device closer to industrial reality, it is possible to attain steady state conditions for the microbial population that it holds . Like this, it is possible to maintain cells' response to variations in [Cu 2+ ] in the feed through time.…”

Section: Introductionmentioning

confidence: 99%

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Causes of inhibition of bioleaching by Cu are also thermodynamic

Mazuelos

García-Tinajero

Romero

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Cu is an indispensable natural resource for society, as its use is widespread and essential for many technologies. Consequently, worldwide production is around 18×106 tn year−1, and close to 25% is produced by bioleaching. Bioleaching enables Cu extraction from minerals in atmospheric conditions by virtue of the catalytic activity of microorganisms. Microbial catalysis is mainly based on Fe3+ production as a leaching agent, a process known as Fe2+ bio‐oxidation. However, bio‐oxidation is inhibited by Cu2+ which limits the use of bioleaching with Cu mineral ores. RESULTS This paper, for the first time, examines the effect of Cu2+ on continuous Fe2+ bio‐oxidation using a packed bed bioreactor with supported cells. Bio‐oxidation was possible in the presence of 20 g L−1 Cu2+, with a less than 25% reduction in rate. About 15% of this drop in rate is due to biological inhibition and the rest to a reduction in oxygen solubility because of salting‐out. The biotic effect is reversed when Cu2+ is removed from the input, and the salting‐out effect can be overcome by improving aeration conditions. CONCLUSION These results, apart from having important ramifications for designing Cu ore bioleaching facilities, contribute to a more versatile and competitive idea of this clean technology. © 2018 Society of Chemical Industry

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“…En relación a la etapa de biooxidación, el diseño de biorreactores es un tema que está siendo ampliamente estudiado en los últimos años [13][14][15] , por lo que este trabajo se atendrá, fundamentalmente, al apartado de lixiviación férrica. El tipo de biorreactor que da lugar a las mayores productividades, cumpliendo los requisitos antes citados, es el lecho fijo inundado [13] .…”

Section: I In Nt Tr Ro Od Du Uc Cc Ci Ió óN Nunclassified

Recuperación de cobre en escorias mediante biolixiviación indirecta

Mazuelos¹,

Iglesias²,

Romero³

et al. 2009

Rev. metal.

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R Re ec cu up p e er r a ac ci io o n n d d e e c co o b b r re e e en n e es sc co o r ri ia as s m m e ed d i ia an n t te e b bi i o ol l i ix xi iv v i ia ac ci i ó ón n i in nd di ir re ec ct ta a ( (• •) )A. Mazuelos * , N. Iglesias * , R. Romero ** , O. Forcat * y F. Carranza * R Re es su um me en n En los procesos pirometalúrgicos, parte del cobre se pierde en la escoria que se genera como residuo del proceso, pudiendo estar presente en ella, en concentraciones muy superiores a las de muchas menas. El cobre se encuentra formando parte de pequeñas partículas de mata, metal blanco y blister, ocluidas en fase de fayalita. En este trabajo se ha probado la viabilidad técnica del proceso BRISA, que está basado en la biolixiviación indirecta, para el tratamiento de este residuo. Se ha caracterizado una escoria con un 2 % en cobre, desde los planos químico, granulométrico y metalográfico. Este material se ha lixiviado con disoluciones de sulfato férrico en reactores agitados, estudiándose el efecto de diversas variables. A partir de los resultados obtenidos, e incluyendo un estudio económico, con resultados muy atractivos, se han seleccionado las mejores condiciones de operación y se ha diseñado la etapa de lixiviación para una planta de 30 t/h de capacidad. En esta planta sería posible alcanzar extracciones de cobre superiores al 70 % con un tiempo de residencia de sólo 5 h. La etapa de biooxidación suministraría el férrico necesario pese a haber presente Cu(II) en el circuito en concentraciones de hasta 30 g/l. P Pa al la ab br ra as s c cl la av ve eEscoria; Biolixiviación indirecta; Proceso BRISA; Lixiviación férrica; Sulfuros de Cobre.C Co op pp pe er r r re ec co ov ve er ry y f fr ro om m s sl la ag g b by y i in nd di ir re ec ct t b bi io ol le ea ac ch hi in ng g A Ab bs st tr ra ac ct tThe main source of copper loss from a smelter is copper in discard slag. Slag can contain Cu in concentrations very much higher than those of many ores. Cu is present in slag entrained in very small drops of matte, white metal and blister copper occluded in fayalitic phase. In this work, the technical viability of the BRISA process, that is based on the indirect bioleaching, for this residue has been proved. A sample of slag, containing 2 % of copper, has been chemical, granulometrical and metallographic characterized and it has been leached with ferric sulphate solutions in agitated reactors. The influence of several variables have been investigated. Once the best operating conditions had been selecting and an economic estimation had been done (with very really attractive results), the leaching stage has been designed for a plant of 30 tonnes per hour capacity. Cu extractions higher than 70% can be achieved with a residence time of only five hours. Despite of Cu(II) concentration in fed is as high as 30 g/l, biooxidation stage can supply Fe(III) demanded by ferric leaching stage. K Ke ey yw wo or rd ds sCopper-slag; Indirect bioleaching; BRISA process; Ferric leaching; Copper sulphides. REVISTA DE METALURGIA, 45 (2)

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Ferric iron production in packed bed bioreactors: influence of pH, temperature, particle size, bacterial support material and type of air distributor

Cited by 32 publications

References 9 publications

Bioleaching of copper via iron oxidation from chalcopyrite at elevated temperatures

Bioleaching of copper via iron oxidation from chalcopyrite at elevated temperatures

Causes of inhibition of bioleaching by Cu are also thermodynamic

Recuperación de cobre en escorias mediante biolixiviación indirecta

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