Electrodeposition of dixanthogen(TETD) on pyrite surface
(School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China)
Abstract: The electrochemical reaction of xanthate on the surface of pyrite was studied using cyclic voltammogrametry, chronopotentiometry and rotating-disc electrode measurements. Experimental results demonstrate that the first step in the reaction is electrochemical adsorption of xanthate ion, and then the adsorbed ion associates with a xanthate ion from the solution and forms a dixanthogen on the pyrite electrode surface. The diffusion coefficient of butyl xanthate on pyrite electrode surface can be determined to be about 1.09×10−6 cm2/s. Using the galvanostatic technique, the kinetic parameters of oxidation of the butyl xanthate ion on the pyrite surface are calculated as Ja=200 μA/cm2, β= 0.203 and J0=27.1 μA/cm2.
Key words: electrochemical reaction; pyrrhotite; xanthate