Infrared Spectroscopic Investigations of the Stability of Xanthate–Mineral Interaction Products

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Abstract:

The products of the interaction of ethyl xanthate (CH3CH2OCS- 2) with copper and chalcocite (Cu2S) electrodes at a controlled potential have been investigated by ex situ infrared spectroscopy. The disappearance of bands assigned to dixanthogen over time indicated that additional reactions were occurring subsequent to the initial interaction. These reactions were also followed by gas-phase infrared photoacoustic spectroscopy (PAS), which suggested the formation of CO2 and COS. The PAS technique was also employed to identify the gas-phase species produced from a variety of powdered minerals [heazlewoodite (Ni3S2), chalcocite (Cu2S), chalcopyrite (CuFeS2), pyrite (FeS2), pyrrhotite (Fe1-x S x ), pentlandite ([Fe,Ni]S), galena (PbS), sphalerite ([Zn,Fe]S), and arsenopyrite ([Fe,As]S)] when treated with ethyl and isobutyl xanthates. The main species produced were COS, CO2, and H20 , with CS2 and C2H5OH being observed for ethyl xanthate in certain cases. The results show that the xanthate films decompose over time. The following decomposition pathways could account for the products observed: elimination of the triatomics from metal–xanthate complexes; decomposition of dixanthogen; formation of radicals; and pyrolysis of the xanthate complexes.

Keywords: External reflectance; Infrared spectroscopy; Minerals; PAS; Xanthates

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702963906087

Affiliations: 1: Department of Mining and Metallurgical Engineering, McGill University, 3450 University Street, Montréal, Québec, H3A 2A7, Canada 2: Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, Québec H3A 2K6, Canada

Publication date: April 1, 1996

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