Biodepression of pyrite using Acidithiobacillus ferrooxidans in seawater

Martin, F.S.; Kracht, Willy; Vargas, T.

doi:10.1016/j.mineng.2017.11.005

Cited by 25 publications

(20 citation statements)

References 20 publications

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“…The tests were performed in a 50 mL Erlenmeyer flask, where 1 g of pyrite was mixed with 19.5 mL of water and 0.5 mL of a solution with iron-free cells of A. ferrooxidans. The flask was shaken in a rotary shaker for 3 h. The number of cells in solution was determined at different times (15,20,30,45, 60, 90, 120 and 180 min) by direct counting in a Neubauer camera using a microscope Axio. Lab.…”

Section: Effect Of Aqueous Medium On the Adhesion Of Bacteria To Pyritementioning

confidence: 99%

“…It has been shown that Acidithiobacillus ferrooxidans can depress pyrite in flotation with fresh water [11][12][13][14][15][16][17][18][19]. A. ferrooxidans has been evaluated as an option to lime as a pyrite depressant, given the problems of seawater flotation and the fact that these bacteria can depress pyrite at the natural pH of seawater (pH 8) [20].…”

Section: Introductionmentioning

confidence: 99%

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Study of the Adhesion Mechanism of Acidithiobacillus ferrooxidans to Pyrite in Fresh and Saline Water

Martin

Aguilar

2019

Minerals

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In the present work, the streaming potential of A. ferrooxidans and pyrite was measured in two environments: fresh and saline water (water with 35 g/L of NaCl) at different pH values. Also, attachment kinetics of A. ferrooxidans to pyrite was studied in fresh and saline water at pH 4. The results show that A. ferrooxidans and pyrite had lower streaming potentials (comparing absolute values) in saline water than in fresh water, indicating the compression in the electrical double layer caused by Cl− and Na+ ions. It was also determined that the bacteria had a higher level of attachment to pyrite in fresh water than in saline water. The high ionic strength of saline water reduced the attractive force between A. ferrooxidans and pyrite, which in turn reduced bacterial attachment. Electrostatic interactions were determined to be mainly repulsive, since the bacteria and mineral had the same charge at pH 4. Despite this, the bacteria adhered to pyrite, indicating that hydrophobic attraction forces and Lifshitz–van der Waals interactions were stronger than electrostatic interactions, which caused the adhesion of A. ferrooxidans to pyrite.

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Section: Effect Of Aqueous Medium On the Adhesion Of Bacteria To Pyritementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the Adhesion Mechanism of Acidithiobacillus ferrooxidans to Pyrite in Fresh and Saline Water

Martin

Aguilar

2019

Minerals

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“…Due to its ability to oxidize ferrous and reduced sulfur compunds, A. ferrooxidans has been widely used in leaching when processing 5 copper oxides and copper sulfides (Donati et al, 2007;Rawlings, 2005). Moreover, A. ferrooxidans has been studied as pyrite depressant in the flotation process (Chandraprabha et al, 2004(Chandraprabha et al, , 2005Hosseini et al, 2005;Mehrabani et al, 2011;Misra et al, 1996;Nagaoka et al, 1999;Ohmura et al, 1993;San Martín et al, 2018). In general, bacteria tend to adhere to solid surfaces forming biofilms rather than remain free in solution as planktonic cells because they find protection against hostile environments and a high concentration of nutrient (Flemming and Wingender, 2010;Schaechter, 2009;Chandraprabha and Natarajan, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Microorganisms, including bacterium Acidithiobacillus ferrooxidans, have been used in the flotation and leaching processes (Chandraprabha et al, 2004(Chandraprabha et al, , 2005Hosseini et al, 2005;Mehrabani et al, 2011;Misra et al, 1996;Nagaoka et al, 1999;Ohmura et al, 1993;San Martín et al, 2018;Donati et al, 2007;Rawlings, 2005). In both processes, the adherence of microorganisms 20 to minerals is an important step.…”

Section: Introductionmentioning

confidence: 99%

Attachment of Acidithiobacillus ferrooxidans to pyrite in fresh and saline water and its fitting to Langmuir and Freundlich isotherms

Robbiano¹,

Tello²

2019

Preprint

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Attachment of bacteria Acidithiobacillus ferrooxidans to pyrite was investigated in two different environment: fresh water and saline water (water with 35 g/L of NaCl), in both cases at pH 4. Adsorption isotherms were ?tted to the Langmuir and Freundlich models. The results showed that the bacteria adhere to pyrite to a greater extent in fresh water than in saline water. The Langmuir and Freundlich models ?tted well the data obtained in fresh water, showing a coeffcient of determination (R2) approximately equal to 0.8 for both models. On the other hand, in saline water the models did not show a good coeffcient of determination with a value approximately equal to 0.4 for both models.

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“…Nowadays, with the incorporation of seawater in the flotation and leaching processes, it is important to study the properties of minerals in this type of water. On the other hand, the use of bacteria in metallurgical processes is becoming more relevant because it represents a sustainable alternative to the reagents currently used (Chandraprabha et al, 2004(Chandraprabha et al, , 2005Hosseini et al, 2005;Mehrabani et al, 2011;Misra et al, 1996;Nagaoka et al, 1999;Ohmura et al, 1993;San Martín et al, 2018;Donati et al, 2007;Rawlings, 2005). The present study aims to determine the behavior of surface charges of A. ferrooxidans and pyrite in fresh water and saline water (water with NaCl at the concentration of seawater, 35 g/L) by streaming potential measurements, in order to know if electrostatic forces are the responsibles of the attachment of the bacteria to pyrite.…”

Section: Introductionmentioning

confidence: 99%

Study of the Adhesion Mechanism of Acidithiobacillus ferrooxidans to Pyrite in Fresh and Saline Water

Robbiano¹

2019

Preprint

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In the present work electrostatic forces are evaluated as the cause of attachment of Acidithiobacillus ferrooxidans to pyrite. Streaming potential of A. ferrooxidans and pyrite was measured in two environment, fresh water and saline water (water with 35 g/L of NaCl) at different pH's values. At the same time, attachment kinetics of A. ferrooxidans to pyrite were carried out in fresh and saline water at pH 4. The results showed that A. ferrooxidans and pyrite present lower streaming potential (comparing absolute values) in saline water than in fresh water, indicating the compression in the electric double layer caused by Cl- and Na+ ions. Simultaneously, it was determined that the bacteria present a higher attachment to pyrite in fresh water than in saline water. This suggests that electrostatics forces do not play a leading role in the adhesion mechanism.

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Biodepression of pyrite using Acidithiobacillus ferrooxidans in seawater

Cited by 25 publications

References 20 publications

Study of the Adhesion Mechanism of Acidithiobacillus ferrooxidans to Pyrite in Fresh and Saline Water

Study of the Adhesion Mechanism of Acidithiobacillus ferrooxidans to Pyrite in Fresh and Saline Water

Attachment of Acidithiobacillus ferrooxidans to pyrite in fresh and saline water and its fitting to Langmuir and Freundlich isotherms

Study of the Adhesion Mechanism of Acidithiobacillus ferrooxidans to Pyrite in Fresh and Saline Water

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