Surface characteristics, collector adsorption, and flotation response of covellite in oxidizing environment
(1.Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Serbia Zijin Mining Doo Bor, Bor 19210, Serbia;
3. Zijin Mining Group Co., Ltd., Longyan 364200, China;
4. School of Zijin Mining, Fuzhou University, Fuzhou 350108, China)
2. Serbia Zijin Mining Doo Bor, Bor 19210, Serbia;
3. Zijin Mining Group Co., Ltd., Longyan 364200, China;
4. School of Zijin Mining, Fuzhou University, Fuzhou 350108, China)
Abstract: The surface characteristics, collector adsorption, and flotation response of covellite in the presence of NaClO and FeCl3 were investigated using micro-flotation tests, X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (TOF-SIMS), and contact angle measurements. The micro-flotation test results indicated that covellite was effectively inhibited by the presence of NaClO and FeCl3. However, the dosages of these depressants were large, and the conditioning time was long. The results of the XPS and TOF-SIMS analyses indicated that NaClO could oxidize the covellite surface and reduce the active sites of Cu. Oxidation products, including CuO and Cu(OH)2, were generated on the covellite surface. After the addition of FeCl3, the precipitation of iron hydroxide on the covellite surface increased the content of hydrophilic species on the mineral surface. Thus, the adsorption of ammonium dibutyl dithiophosphate on covellite surface was prevented, which reduced the floatability of the covellite.
Key words: covellite; floatability; TOF-SIMS; NaClO; FeCl3