期刊
POWDER TECHNOLOGY
卷 343, 期 -, 页码 578-585出版社
ELSEVIER
DOI: 10.1016/j.powtec.2018.11.048
关键词
Calcium hypochlorite; Flotation separation; Pyrite; Covellite; Depression
资金
- National Natural Science Foundation of China [51504053]
- Fundamental Research Funds for the Central Universities [N170107013]
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. (C) 2018 Elsevier B.V. All rights reserved.
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