Abstract
Fluorite is an important non-metallic mineral, and the most efficient way to separate it from gangue is flotation. The commonly used collectors are oleic acid and oxidized paraffin soap, but those two collectors both have a problem of bad solubility, this phenomenon worsens at low temperature. Sodium petroleum sulfonate exhibits a good collecting performance on fluorite, but it has not been systematically studied. In this paper, different types of sodium petroleum sulfonate were used to evaluate the effect of active substance content and average molecular weight. Molecular dynamics simulation was used to understand the mechanism that causes the flotation difference between mono-sulfonate and di-sulfonate. This study identifies that active content has a positive effect on the flotation recovery of fluorite while the molecular weight plays a negative role. The reason why di-sulfonate’s performance is relatively weak at high concentration lies on the steric-hindrance effect, larger cross-sectional area limits the tail–tail interaction between sulfonates.
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