Abstract
Frothers are used in mineral flotation to form small bubbles and a froth layer. As surfactants, frothers may also disperse oily collectors and promote their adsorption on mineral surfaces. Following the previous work showing that aliphatic alcohol frothers inhibited the dispersion of dodecane in de-ionised water, but promoted the dispersion in NaCl solution, this study examined the effect of polyglycol-type frothers, including Dowfroth 250 (DF250) and Dowfroth 400 (DF400), on the dispersion of dodecane in de-ionised water and NaCl solution. Dispersion tests, interfacial tension measurements, zeta potential measurements and viscosity measurements show that DF400 and DF250 were able to enhance dodecane dispersion in both de-ionised water and NaCl solution by promoting the formation and stabilisation of dodecane droplets. DF250 dispersed dodecane more than DF400 mainly through producing more stabilised dodecane droplets driven by stronger electrostatic and steric repulsion. Although NaCl inhibited dodecane dispersion in water, synergy occurred between NaCl and DF400/DF250 to facilitate dodecane dispersion.
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