The Effect of Multivalent Ions on the Flotation of Coal
- 1 June 1986
- journal article
- research article
- Published by Informa UK Limited in Separation Science and Technology
- Vol. 21 (4), 393-402
- https://doi.org/10.1080/01496398608057170
Abstract
Flotation of coal generally exhibits a maximum around neutral pH. This maximum, despite the marked mineralogical heterogeneity, has been attributed to the isoelectric point of the coal in this pH region. The results obtained in this study demonstrate the important role of multivalent ions in determining the pH dependence of flotation. Ca, Fe, and Al electrolytes are found to depress coal in the pH region of metal hydroxide precipitation. Adsorption tests as a function of pH show coal to adsorb the multivalent ions in a manner similar to oxides. The data obtained here are examined in terms of possible surface and bulk precipitation of metal hydroxide species on coal surfaces.Keywords
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