Details

Autor(en) / Beteiligte

• Huang, Xiaoping
• Huang, Kaihua
• Jia, Yun
• Wang, Shuai
• Cao, Zhanfang
• Zhong, Hong

Titel

Investigating the selectivity of a xanthate derivative for the flotation separation of chalcopyrite from pyrite

Ist Teil von

• Chemical engineering science, 2019-09, Vol.205 (C), p.220-229

Ort / Verlag

United Kingdom: Elsevier Ltd

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •The synthesis of a novel xanthate derivative (HEIBX) and its application in the separation of chalcopyrite from pyrite.•The molecular behaviour of HEIBX and SIBX were compared by DFT calculation.•Properties of HEIBX were compared with properties of another surfactant SIBX.•HEIBX exhibited superior collector ability and selectivity for chalcopyrite against pyrite than SIBX.•HEIBX chemisorbed on the surface of chalcopyrite by formation of CuO and CuS bonds. Separating chalcopyrite, an important copper-containing ore, from pyrite is an important mineral-processing objective. Herein, we report the synthesis of S-hydroxyethyl-O-isobutyl xanthate (HEIBX), a novel surfactant bearing both hydroxyl and thione groups, through the attachment of a hydroxyethyl group to sodium isobutyl xanthate (SIBX), and its first application as a flotation collector for the selective flotation-separation of chalcopyrite from pyrite. The flotation mechanism involving HEIBX and chalcopyrite or pyrite was investigated by DFT calculations, UV–vis spectroscopy, contact-angle and surface-tension measurements, flotation and zeta-potential experiments, as well as FTIR spectroscopy and XPS. Incorporation of the hydroxyethyl group was observed to increase the molecular properties of SIBX by increasing the number of active sites, arrangement density, selectivity and hydrophobicity, thereby improving its flotation performance. Chalcopyrite was separated from pyrite using 4 × 10−5 mol·L−1 HEIBX at pH ∼8.0. Furthermore, we found that the hydroxyl and thione functional groups adsorb onto the chalcopyrite surface though the formation of COCu and CSCu bonds.