Date of Award
Doctor of Philosophy (PhD)
The chalcopyrite-molybdenite (Cu-Mo) flotation industry is increasingly turning to organic depressants as suitable replacements for inorganic reagents such as NaHS due to environmental and safety concerns as well as high consumption rates of the inorganic reagents. An opportunity arises for improving, designing and synthesizing new alternative reagents. Disodium Carboxymethyl Trithiocarbonate (Orfom® D8) depressant is an organic depressant with a carboxylate group on one end and a trithiocarbonate group at the other end. Fundamental results are shown regarding the interaction of the Orfom® D8 depressant in the bulk flotation of a Cu-Mo concentrate from an operating North American mine. Cyclic Voltammetry on pure copper and Fourier Transform Infrared (FT-IR) Spectroscopy and X-ray Photoelectron Spectroscopy (XPS) measurements on pure chalcopyrite with Orfom® D8 depressant treatment are also reported. Carbon Disulfide (CS2) and Thioglycolic Acid (TGA) were determined as the decomposition products of Orfom® D8 depressant using Laser Raman Spectroscopy. Through such characterization techniques, a potential adsorption mechanism of Orfom® D8 on the mineral surface was identified, and its depressant characteristics in the Cu-Mo flotation system explained.
Timbillah, Simon, "MECHANISM FOR DISODIUM CARBOXYMETHYL TRITHIOCARBONATE (Orfom® D8) DEPRESSION IN CHALCOPYRITE-MOLYBDENITE FLOTATION SYSTEMS" (2019). Graduate Theses & Non-Theses. 224.