Abstract
A conventional paddle-type mixer and a gravity-flow mixing device were evaluated for conditioning of fine phosphate feed (−35+150 mesh) with fatty acid and fuel oil, and for acid scrubbing prior to cationic flotation. Gravity-flow mixing required less residence time but slightly higher reagent concentrations to achieve recovery levels similar to conventional conditioning. Grade was less sensitive to reagent concentration using the gravity-flow mixer. For acid scrubbing, the gravity-flow mixer proved equally effective. In this paper, the effect of time, pulp density, reagent concentration, and emulsification on conditioning and acid scrubbing efficiency of the two devices is discussed.
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