Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 18    No. 6    December 2008

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Microcalorimetric studies of interaction between
extracellular polymeric substance and sulfide minerals
ZHU Jian-yu(朱建裕)1, 2, YANG Peng(杨 鹏)1, LI Bang-mei(李邦梅)1,
ZHANG Jing-xia(张静霞)1, HUANG Qiu-xia(黄秋霞)1

1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China

Abstract:Extracellular polymeric substance(EPS) seem to be important for bioleaching. For better control of the processes, the function of EPS of leaching bacteria is of crucial importance. Microcalorimetric measurement was used to study the three simulative components of EPS. The attachment of L-cysteine increases with its increasing concentration, which is Langmuir monomolecular layer adsorption. The attachment of glucose on pyrite is similar to mannose, which is not Langmuir monomolecular layer but multilayer adsorption. The results prove that the EPS mediates attachment and reacts with the sulphide surface and results in changed chemical properties of the mineral surface. It provides a new method to study the interaction between EPS and sulfide minerals.


Key words: extracellular polymeric substance; sulfide mineral; pyrite; microcalorimetry; attachment

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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