An increasing trend was observed with the increasing dosage of Mn 2+ when MnCl 2 was added first, compared to that without MnCl 2 addition.
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Study of the Effect of Manganese Ion Addition Points on the Separation of Scheelite and Calcite by Sodium Silicate.
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The sentences
In addition, the adsorption of NaOL on scheelite showed a decreasing trend, indicating that the increase of Mn 2+ dosage would inhibit the flotation of scheelite.