Surface chemistry fundamentals of biosorption of Rhodococcus opacus and its effect in calcite and magnesite flotation

被引：67

作者：

Botero, Ana Elisa C. ^{[1
]}

Torem, Mauricio Leonardo ^{[2
]}

de Mesquita, Luciana Maria S. ^{[3
]}

机构：

[1] Pontifical Catholic Bolivarian Univ, Antioquia, Colombia

[2] Met Catholic Univ, Dept Mat Sci, Rio De Janeiro, Brazil

[3] Brazilian Petr Agcy, Rio De Janeiro, Brazil

来源：

MINERALS ENGINEERING | 2008年 / 21卷 / 01期

关键词：

bioflotation; adsorption; Rhodococcus opacus; industrial minerals; DLVO and X-DLVO theory;

D O I：

10.1016/j.mineng.2007.08.019

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

The affinity of Rhodococcus opacus cells for calcite and magnesite surfaces has been studied in order to evaluate its application as a flotation collector. The surface properties of minerals and R. opacus were characterized using infrared techniques. The mineral spectrums, before and after the bacterial interaction, indicated a mineral surface interaction with thee R. opacus cell wall. The results were compared with the zeta potential curves as a function of the pH. The cell wall composition of R. opacus was characterized and the R. opacus hydrophobicity was either evaluated with contact angle measurements. The interfacial tension components were calculated based on the van Oss and Fowkes equations. The obtained results were supported by DLVO and X-DLVO theories for selected pH values. The results show the paramount innovation that R. opacus presents as a biocollector and its possible application in the mineral flotation industry. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：83 / 92

页数：10

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