Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 33, Issue -, Pages 131-141Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2015.09.027
Keywords
Flotation; Scheelite; Calcite; Hydroxamic acid; Amide
Funding
- National High-Tech Research and Development Program of China (863 Program) [2013AA064102]
- National Basic Research Program of China (973 program) [2014CB643403]
- Ministry of Science and Technology of China
- National Natural Science Foundation of China [21206199]
- Scientific Research Project of Education Department of Hunan Province [14C1155]
- High Performance Computing Center of CSUCSU, China
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In this paper, novel amide-hydroxamic acid surfactants, such as (N-(6-(hydroxyamino)-6-oxohexyl) benzamide (NHOB), N-(6-(hydroxyamino)-6-oxohexyl) octanamide (NHOO), N-(6-(hydroxyamino)-6oxohexyl) decanamide (NHOD) and N-(4-(hydroxyamino)-4-oxobutyl) octanamide (NOBO), were introduced as flotation collectors for selective separation of scheelite from calicite. The micro-flotation results demonstrated that compared to NHOO, NOBO and NHOB, NHOD exhibited superior collecting power to scheelite and enabled the separation of scheelite and calcite under pH around 10. The calculation results of density functional theory (DFT) and C log P (octanol-water partition coefficient) indicated that NHOD owned excellent hydrophobicity and affinity to scheelite surfaces. The analyses of FTIR spectra, zeta potential and XPS illustrated that besides the electrostatic attraction with Ca cationic species on scheelite surfaces, NHOD might chemisorb onto scheelite by formation of NHOD-W surface complexes, resulting in a superior selectivity to scheelite compared with calcite. NHOD's unique properties, such as characteristic bond patterns on scheelite surfaces, double hydrophobic groups, and intermolecular hydrogen bonds between neighboring molecules coated on scheelite surfaces, rendered it to be a superior collector for scheelite/calcite flotation separation. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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