Chemical and Electrochemical Reactions in the Chalcocite-xanthate System.
O'Dell-CS; Dooley-RK; Walker-GW; Richardson-PE
Proc Int'l Symp Electrochem Min &met Proc Electrochem soc 1984 84-10:81-95
The interactions between chalcocite and ethylxanthate were examined by the Bureau of Mines in an electrochemical-microflotation cell containing a particle bed working electrode. Cyclic voltammetry showed the formation of a chemisorbed product commencing at -0.5 V (saturated calomel electrode) with bulk oxidation products, possibly cuprous xanthate, forming above -0.23 V. Relating the charge passed on a potentiostated mineral bed after addition of xanthate to spectrophotometric changes in xanthate suggests the presence of a fast chemical reaction and a charge transfer reaction. The strong correlation between flotation response and potential indicates that chemisorption of the ethylxanthate produces a hydrophobic layer sufficient for chalcocite flotation.
Proc. Int'l Symp. Electrochem. Min.&met. Proc., Electrochem.soc.,v. 84-10, 1984, PP. 81-95