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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2009,Vol.25>> Issue(05)>> 963-969     doi: 10.3866/PKU.WHXB20090424         中文摘要
Molecular Modeling for Selective Adsorption of Halite with Dodecylmorpholine
WANG Li-Juan, LIU Gou-Sheng, SONG Xing-Fu, YU Jian-Guo
Engineering Research Center of Resources (Salt Lake) Process Engineering, Ministry of Education, East China University of Science and Technology, Shanghai 200237, P. R. China
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Molecular modeling techniques were employed to investigate the selective adsorption mechanism of NaCl with collector dodecylmorpholine(DMP) in halite-carnallite reverse flotation system. Adsorption models of DMP on halite and carnallite surfaces were constructed and optimized using Material Studio 4.0 program and COMPASS force field method, molecular dynamics simulation and minimization method were used to search the most favorable adsorption models.We conclude that DMP adsorbs on the interfacial water structure of halite (100) surface by hydrogen bonding between the oxygen and nitrogen atoms in the functional group of DMP and hydrogen atoms in the water structure. The interaction energy between them was found to be -119.49 kJ·mol-1. The structure of water on carnallite surface is not stable, which allows DMP direct contact with carnallite surface at a smaller adsorption energy of -37.97 kJ·mol -1. Because of the difference in adsorption energies of DMP with the two minerals, we assumed that DMP preferentially adsorbs on halite surface in the flotation process.



Keywords: Molecular modeling   Selective adsorption   Dodecylmorpholine(DMP)   Collector   Carnallite   Reverse flotation  
Received: 2008-12-02 Accepted: 2009-01-13 Publication Date (Web): 2009-02-25
Corresponding Authors: LIU Gou-Sheng Email: gsliu@ecust.edu.cn


Cite this article: WANG Li-Juan, LIU Gou-Sheng, SONG Xing-Fu, YU Jian-Guo. Molecular Modeling for Selective Adsorption of Halite with Dodecylmorpholine[J]. Acta Phys. -Chim. Sin., 2009,25 (05): 963-969.    doi: 10.3866/PKU.WHXB20090424
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