Leptosririllum ferrooxidans-sulfide mineral interactions with reference to bioflotation nad bioflocculation

Vilinska, Annamaria; Rao, K. Hanumantha

doi:10.1016/s1003-6326(09)60016-9

Cited by 45 publications

(29 citation statements)

References 19 publications

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“…Initially, we observed an isoelectric point (IEP) of approximately 2.8, as found in previous works (Botero et al, 2007(Botero et al, , 2008Mesquita et al, 2003;Merma et al, 2013). According to several authors (Rao and Subramanian, 2007;Natarajan, 2006;Vilinska and Rao., 2008;Faharat et al, 2008;Van Der Wal et al, 1997), this acidic value is related to the higher presence of anionic functional groups compared with cationic groups. We also observed a singular effect: above pH 9, the zeta potential values of the cells systematically shifts to more positive values (as the pH shifts to more basic values).…”

Section: Zeta Potential Studiessupporting

confidence: 82%

“…One bacteria, quite recently used in mineral bioflotation, is Rhodococcus opacus (Botero et al, 2007;Mesquita et al, 2003;Botero et al, 2008;Merma et al, 2013). It is a Gram positive bacterium with different types of components on their cell-wall, which are primarily polysaccharides, carboxylic acids, lipid groups and mycolic acids, that result in amphoteric behavior (hydrophobic and/or hydrophilic properties) of the bacteria (Mesquita et al, 2003;Natarajan, 2006;Vilinska and Rao., 2008). According to Natarajan (2006), the presence of these components produces a selective behavior in the bacteria.…”

Section: Introductionmentioning

confidence: 99%

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Cellular Adaptation: Culture conditions of R. opacus and bioflotation of apatite and quartz

2017

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It is well known that the culture conditions of microorganisms may affect their surface properties, zeta potential and hydrophobicity via the modification of the cell wall functional groups or metabolic products. The R. opacus bacteria strain was separately adapted to the presence of apatite and quartz, after which a cellular adaptation procedure was developed by repeated sub-culturing with a successive increase in the mineral content. Zeta potential, surface tension, FTIR and microflotation studies were used to evaluate the behavior of the cells that were developed under defined culture conditions. The cellular adaptation induced a modification of the bacterial surface charge. The FTIR results showed a modification of its functional groups. The surface tension results suggested that longer growing time promoted a higher production of metabolites. The use of mineral-adapted cells promoted an improvement in the flotability of both minerals, but it was more significant for apatite flotation. Additionally, the mineral flotability remained unchanged when the cells developed under a longer culture time. Nevertheless, there was a reduction in the surface tension.

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Section: Zeta Potential Studiessupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Cellular Adaptation: Culture conditions of R. opacus and bioflotation of apatite and quartz

2017

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“…Por razões econômicas e ambientais, a necessidade de recuperação da massa de hematita contida no rejeito incentiva a pesquisa de experimentos relacionados à flotação de óxido de ferro (hematita) (BROD, 2012). O estudo das propriedades de superfície, como hidrofobicidade e potencial zeta das partículas minerais bem como a previsão termodinâmica das energias de interação entre mineral e reagente tornam-se importantes, uma vez que a partir desses princípios, podem-se obter informações sobre a seletividade necessária ao processo de concentração mineral (VILINSKA, 2007). No presente trabalho a aplicação de um reagente específico (Bacillus subtilis) foi investigada para propor um novo sistema de flotação seletiva da hematita em relação ao quartzo.…”

Section: Introductionunclassified

Estudo De Interação Seletiva De Hematita Em Relação Ao Quartzo

Peçanha¹,

Monte²,

Torem³

2016

ABM Proceedings

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ResumoCom o objetivo de estudar a interação da hematita com biorreagente de flotação (Bacillus subtilis), foram realizados experimentos de ângulo de contato. Após a interação com o biorreagente, a superfície da hematita apresentou uma hidrofobicidade apresentando um valor de 46,0º. Os experimentos de potencial zeta mostraram uma interação acentuada entre o reagente e o mineral na faixa de pH alcalina com deslocamento do ponto isoelétrico da hematita. Ensaios de microflotação foram conduzidos em tubo de Hallimond modificado, em pH 6, com uma recuperação de, aproximadamente, 80%. As teorias DLVO e X-DLVO foram aplicadas para avaliar as energias de interação entre o reagente e os minerais. As duas teorias foram capazes de prever a interação que ocorre entre o biorreagente e a hematita. Os resultados evidenciaram o uso promissor do reagente na flotação direta de hematita. Palavras-chave: Hematita; Quartzo, Teoria X-DLVO; Bioflotação. INTERACTION STUDY SELECTIVE HEMATITE IN RELATION TO QUARTZ AbstractIn order to study the interaction of hematite with a bioreagent flotation (Bacillus subtilis), contact angle measurements angle were performed. After interaction with the bioreagent, the hematite surface has presented hydrophobicicity showed a contact angle value of the 46,0º. The zeta potential experiments showed marked interaction between the bioreagent and the mineral in the alkaline pH range with displacement of the isoelectric point of charge of the hematite. Microflotation tests were conducted in modified Hallimond tube, at pH 6, with 80% of hematite recovery. The DLVO and X-DLVO theories were applied to evaluate the energy of interaction between the reagent and minerals. Two theories have also been able to predict the interaction between the reagent and hematite. The results show the promising use of the reagent in direct flotation of hematite.

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“…The adhesion of L. ferrooxidans cells on the pyrite surface caused flocculation at all pH values. The biopolymers produced by bacteria are responsible for bridging the mineral particles and caused flocculation [6]. EBP (extracellular bacterial proteins) isolated from Paenibacillus polymyxa were used for selective separation of both pyrite and chalcopyrite from quartz, sphalerite and galena [7].…”

mentioning

confidence: 99%

Electrokinetic and Flotation Investigations of Surface Properties Modification of Magnesite and Serpentinite Using Biosurfactants and Surfactants

Didyk-Mucha¹,

Polowczyk²,

Sadowski³

2015

JPSA

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This paper presents some results of zeta potential measurements performed into biosurfactant adsorption onto magnesite and serpentinite surface. Zeta potential and isoelectric point measurement of magnesite and serpentinite particles before and after interaction with biosurfactant broth solution and activator (nickel(II) ion solution) were carried out. The zeta potential results show that presence of biosurfactants changes both magnesite and serpentinite surface potential by physical adsorption which increases the hydrophobicity of mineral particles. Measurements of particles zeta potential in the presence of biosurfactant broth are relevant to the minerals flotation. Hallimod flotation response of magnesite and serpentinite as a function of collector concentration was investigated. Bioflotation test results show that at the presence of broth, the flotation separation of magnesite from serpentinite is possible.

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Leptosririllum ferrooxidans-sulfide mineral interactions with reference to bioflotation nad bioflocculation

Cited by 45 publications

References 19 publications

Cellular Adaptation: Culture conditions of R. opacus and bioflotation of apatite and quartz

Cellular Adaptation: Culture conditions of R. opacus and bioflotation of apatite and quartz

Estudo De Interação Seletiva De Hematita Em Relação Ao Quartzo

Electrokinetic and Flotation Investigations of Surface Properties Modification of Magnesite and Serpentinite Using Biosurfactants and Surfactants

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