Abstract
A portion of dodecyl amine (DDA) in a muscovite flotation system was replaced with alcohols with different carbon-chain lengths. These alcohols included octanol (OCT); decanol (DEC); dodecanol (DOD); and tetradecanol (TER). The muscovite adsorption behavior of the mixed DDA and alcohol systems were investigated through zeta potential; contact angle; and adsorption quantity tests. Single-mineral flotation tests showed that the muscovite-collecting power of the mixed DDA/alcohol (OCT, DEC, or DOD) system was stronger than that of the pure DDA system. The muscovite-collecting power of the collector systems decreased in the following order: DDA/DEC > DDA/OCT > DDA/DEC > DDA > DDA/TER. Zeta potential and contact angle analysis indicated that when combined with DDA; alcohols physically adsorbed on the surfaces of muscovite. This behavior improved the hydrophobicity of muscovite. Furthermore, adsorption analysis revealed that synergy between DDA and alcohol enhanced the adsorption of alcohol on muscovite. DDA has a dominant role in synergistic adsorption; whereas alcohol has a supporting role. Among all tested alcohols; DDA and DOD exhibit the highest synergetic adsorption effect because of their similar carbon-chain lengths. This similarity promotes the formation of a compact adsorption layer on the muscovite surface.
Highlights
A portion of dodecyl amine (DDA) in a muscovite flotation system was replaced with alcohols with different carbon-chain lengths
We previously investigated the effects of a mixed dodecyl amine chloride/octanol (OCT) collector system on muscovite flotation [21]
The muscovite flotation efficiency of DDA combined with OCT, DEC, or DOD is higher than that of DDA alone
Summary
Muscovite has received considerable interest because of its insulating and heat-resistant properties It is widely applied in the fabrication of coatings, paints, plastics, and electrical components [1]. Sis et al [18] studied a combined collector system for phosphate flotation They found that the addition of nonionic collectors to traditional fatty acid collectors can improve flotation results. We previously investigated the effects of a mixed dodecyl amine chloride/octanol (OCT) collector system on muscovite flotation [21]. We replaced a portion of DDA with alcohols of different carbon-chain lengths. These alcohols included OCT, DEC, decanol (DOD), and tetradecanol (TER). We discussed the effect of the carbon-chain length of alcohol in muscovite flotation
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