| Flotation separation between calcic minerals such as calcite and fluorite is one of the probl em in mineral processing industry. Choosing reasonable collector and suppressor is the key to o btain good indicators, but metal ions existing in the scheelite flotation system will disturb the w orking performance of collector and suppressor, and then affect the separation between scheelite with gangue containing calcium. This paper select scheelite, calcite and fluorite as the research object, and choose benzohydroxamic acid as the collector, to study the influence of metal ions, i ncluding Pb2+, Fe3+, Cu2+, Ca2+, Mg2+ on mineral flotation, and analyze the working mechanism,and to provide reference value for calcic minerals flotation separation. The main research conte nt and innovation achievements are as follows.Fe3+, Cu2+ showed obvious inhibitory effect on scheelite flotation in the alkaline conditions, but a weak inhibition to calcite and fluorite flotation; The effects Ca2+, Mg2+on three kinds of calcium minerals flotation is faint; Pb2+ is the only ion that have the activation performance to three calcium minerals, and appropriate amount Pb2+ can extremely activate calcic minerals.Appropriate amount of Pb2+ can obviously improve the wettability on the surface of the mineral, promot benzohydroxamic acid to be adsorbed on the surface of mineral, and improve the mineral surface Zeta potential. In high enough concentrations of Pb2+, there will be two potential change; Pb2+ compounds after activating mineral containing calcium salt is closely related to the slurry p H, At low p H, the prior compounds is Pb OH+, whereas high p H get interface Pb(OH)2(s).In the presence of Pb2+, calcite and fluorite are fully suppressed under the depression effect of a moderate amount of sodium silicate, while scheelite still keep good flotability, which can effectively separate scheelite with calcite and fluorite. |
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