Abstract: The mechanism of scheelite flotation from calcite and fluorite at normal temperature was studied by the single mineral flotability test，zeta potential measurement，adsorption measurement and solution chemistry calculation.Scheelite can be selectively separated from calcite and fluorite at normal temperature using sodium silicate as depressant and 733 oxidized paraffin soap as collector at pH=11.0 using CaO+Na₂CO₃ as pH regulator(at mass ratio of 1∶3).Using CaO+Na₂CO₃ as pH regulator，Ca²⁺ concentration on the surfaces of fluorite and calcite was greater than that on scheelite surface.And then the addition of sodium silicate produced a greater decrease of zeta potential of fluorite and calcite than scheelite.Adsorption measurement results showed that sodium silicate had a adsorption capacity in the order：fluorite> calcite> scheelite.Solution chemistry calculation showed that calcium silicate formed on the surfaces of minerals in the order：fluorite> calcite> scheelite.

Key words: Scheelite, Flotation at normal temperature, Zeta potential, Adsorption