In-situ FTIR study of ethyl xanthate adsorption on sulfide minerals under conditions of controlled potential

Dithiophosphinate–pyrite interaction: Voltammetry and DRIFT spectroscopy investigations at oxidizing potentials

“…The presence of broad IR peaks at 598 and 510 cm −1 suggested that (DTPI) 2 and/or DTPI • formed on pyrite surfaces at pH 9.2 and pH 11, but major surface compounds are Fe oxyhydroxides. There is always a competition between the adsorption of hydrophobic collector species and hydrophilic metal oxyhydroxides, and stability of these hydrophilic species increases at higher Eh and pH [21,22]. Fig.…”

Adsorption Study of Sodium Isopropyl Xanthate On Chalcopyrite

“…al. [8], the oxidation reaction of chalcopyrite in alkaline media is: CuFeS 2 → Cu 1-x Fe 1-y S 2-z + xCu 2+ + yFe 2+ + zS° + 2(x -y)e - [1] Cu 1-x Fe 1-y S 2-z → (y-x)CuS + (1-y)Cu 2+ + (1-y)Fe 2+ +(2+x-y-z)S° + 2(1-y)e -E 0 =0.9 V [2] Then, these products react with the adsorbed xanthate on the surface forming cuprous xanthate, CuX [2] and iron hydroxides, Fe(OH) 3 [8,9]: Cu 1-x Fe 1-y S 2-z + CuS + X -→ CuX + Fe(OH) 3 + S° + 2e - [3] The xanthate adsorption takes place for a charge transfer process, which includes its oxidation, adsorption and later the formation of dixanthogen [3,5-7]:…”

“…First, we investigated the electrochemical behavior of the mineral to investigate the potential range without interfering with the medium; thus it was suggested a working potential range of -1.1 V at 1.1 V vs. SCE. For the voltammetric response in absence of xanthate, we can detect a current wall related to the oxidation processes of chalcopyrite, reactions [1] and [2] (only controlled by charge transfer). Once xanthate is added at concentrations greater than 0.01 M the appearance of oxidation peaks becomes more evident (peaks O1, O2 and O3).…”

Characterization of natural tetrahedrite/aqueous solution system by electrochemical techniques

“…In spite of the existence of many studies concerning the electrochemical characteristics of other mineral sulfide species such as: enargite [8][9][10][11][12], chalcocite [13], chalcopyrite [14], pyrite [14], tenantite [15] together with studies related to the interaction of some of these mineral species with type thiol collector agents [16][17][18][19][20][21], the literature related to the tetrahedrite specie is scarce.…”