Hydrophobic agglomeration of rhodochrosite fines in aqueous suspensions with sodium oleate

Hydrophobic agglomeration of rhodochrosite fines in aqueous suspensions with sodium oleate has been investigated through wettability measurement, optical microscopy observation, laser-based particle size detection, micro-flotation test, zeta potential measurement in this work. The experimental results indicated that the hydrophobicity of rhodochrosite was a dominant factor for the hydrophobic agglomeration. And a higher sodium oleate concentration could contribute to bigger agglomeration particle size and more regular agglomerates. The increased apparent particle size of minerals through hydrophobic agglomeration interaction was conducive to the micro-flotation recovery improvement of rhodochrosite fines in spite of a simultaneous increase in the negative zeta potential of rhodochrosite, meaning that the chemical adsorption was the primary reason between sodium oleate and rhodochrosite. Furtherly, the data calculated from extended DLVO theory was also convinced that hydrophobic interaction between the particles increased much more strongly than electrostatic repulsion from the adsorption of sodium oleate. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The study investigated the hydrophobic agglomeration of rhodochrosite fines in aqueous suspensions with sodium oleate using various techniques such as wettability measurement, optical microscopy observation, laser-based particle size detection, micro-flotation test, and zeta potential measurement. The results showed that the hydrophobicity of rhodochrosite played a key role in the agglomeration process, with higher concentrations of sodium oleate leading to larger and more regular agglomerates. Despite an increase in the negative zeta potential of rhodochrosite, the hydrophobic agglomeration interaction improved the micro-flotation recovery of rhodochrosite fines, indicating that chemical adsorption played a primary role in the interaction between sodium oleate and rhodochrosite.