W. Yin, Bin Yang, Ya-feng Fu
Feb 1, 2019
Citations
1
Influential Citations
50
Citations
Journal
Powder Technology
Abstract
Abstract The effect of calcium hypochlorite (Ca(ClO)2) on the flotation separation of covellite and pyrite with ammonium dibutyl dithiophophate (ADD) has been investigated through micro-flotation tests, zeta-potential measurements, infrared spectroscopy (IR) analyses, adsorption measurements and X-ray photoelectron (XPS) analyses. The flotation results illustrate that Ca(ClO)2 depressed pyrite selectively and had little effect on covellite at pH 10. The zeta-potential measurements indicate that a potential change occurred on covellite and pyrite because of the adsorption of ADD. The selective adsorption of Ca(OH)+ on pyrite causes a sharp decrease in the negative potential. In addition, adsorption studies and IR analyses demonstrate that the adsorption of ADD on pyrite is strongly inhibited by Ca(ClO)2, whereas that on covellite is affected only slightly. Furthermore, XPS analyses confirm that pyrite is preferentially oxidized by Ca(ClO)2 to form CaSO4 and Fe(OH)3 on its surface; thus, the adsorption of ADD on pyrite is prevented, resulting in the depression of pyrite.