Interactions between sulphide minerals and alkylxanthates 9. A vibration spectroscopic study of the interaction between arsenopyrite, millerite, molybdenite, orpiment and realgar and ethylxanthate and decylxanthate ions in aqueous solution

In SituInfrared Characterization of Surface Products of Interaction of an Aqueous Xanthate Solution with Chalcopyrite, Tetrahedrite, and Tennantite

“…One part of the sediment with a significant amount of collector solution was contacted with the reflection element and investigated in situ by ATR technique. The second part few published works on the determination of the adsorption was centrifuged, dried at room temperature, and studied ex products of xanthate on chalcopyrite (1)(2)(3)(4)(5), and they present situ by DRIFT technique. Adsorption of xanthate was perdifferent conclusions about the surface composition and the formed from basic (pH 9.5 { 0.2) and acidic (pH 5.5 { 0.2) mechanism of adsorption.…”

Molecular modeling study on the relative stabilities of the flotation products for arsenic-containing minerals: dixanthogens and arsenic(III) xanthates

“…Our calculated C6-S5 and C6-O(S)9 bond distances indicate a substantial delocalization of the π -electron density on these bonds in both compounds. All three xanthate ligands appear to be reasonably planar from COCC or CSCC dihedral angles in As(C 2 H 5 OCS 2 ) 3 and As(C 2 H 5 SCS 2 ) 3 , respectively. There is a good correspondence between the theoretically and experimentally determined structural parameters.…”

“…1 and 2. Since the structural parameters of the xanthate ions have already been mentioned, In the case of As(C 2 H 5 OCS 2 ) 3 and As(C 2 H 5 SCS 2 ) 3 structures, three xanthate ions are bonded to the As atom asymmetrically with different As-S distances. On the basis of the IR spectra (splitting of the C=S vibration) an asymmetric ligand bonding has been proposed for these com- pounds [12].…”

“…Arsenopyrite is the most important among these naturally occurring minerals. It has been experimentally shown that, using the ethyl xanthate ion as a collector, diethyl dixanthogen and arsenic(III) ethyl xanthate are formed as major products on these mineral surfaces, since arsenic in realgar and arsenopyrite is probably oxidized to the +3 state [2,3]. Diethyl dixanthogen is formed in a redox reaction between ethyl xanthate and highly oxidizing species such as S 2 O 2− 8 and/or S 2 O 2− 7 ions on the mineral surfaces.…”

Selective separation of arsenopyrite from pyrite by biomodulation in the presence of Acidithiobacillus ferrooxidans

“…The solubility of arsenic(III) propyl xanthate species formed on the surface of arsenopyrite is high compared to amyl xanthate species and hence the amount of dixanthogen formed would be relatively lower when conditioned with isopropyl xanthate. DRIFT spectral studies by Valli et al [21] of the surface of arsenopyrite treated with potassium ethyl xanthate and potassium decyl xanthate showed no sign of sorbed ethylxanthate species, but sorption of decylxanthate species was observed. This difference was explained to be due to the difference in their solubility.…”