A study of adsorption mechanism of Dodecylamine (cas 124-22-1) on sphalerite

Add time:09/25/2019    Source:sciencedirect.com

Long-chain primary amines are not only good collectors for silicate minerals, but, they can also float some metallic sulfides. However, the flotation mechanism of sulfide minerals using long-chain primary amines as collector is uncertain. In this paper, the flotation performance and adsorption mechanism of Dodecylamine (cas 124-22-1) in the flotation of sphalerite was studied using micro flotation tests, zeta potential measurements, XPS analysis and FTIR measurements. The dodecylamine showed better sphalerite flotation performance over a wide pH range even at a low collector dosage. The spectroscopic data in combination with zeta potential showed that: (1) chemisorption occurred between the N atoms in dodecylammonium ions (RNH3+) and the sulfur atoms in ZnS over the pH range from 1 to 13. The molecular dodecylamines (RNH2) could also adsorb via H-bonds with other sulfur atoms; (2) the molecular dodecylamine absorbed onto the sphalerite surface may screen the electrostatic repulsion between the positive-charged head groups (−NH3+) absorbed onto the sphalerite surface, which increased the density of absorbed amine and further enhanced the surface hydrophobicity; (3) in the alkaline pH range, the dodecylamine colloidal precipitates appeared, and the zeta potential of the colloidal precipitates changed from positive to negative as the pH increased. As a result, positively charged precipitates electrostatically adsorbed onto the negatively charged sphalerite surface thus enhancing the flotation recoveries, while negatively charged precipitates inhibited sphalerite flotation.

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