Apart from determining attachment time of pure minerals, attachment time has been also measured in the case of real composite particles (Albijanic et al., 2011, 2012). The most relevant conclusion of these studies is that attachment time is strongly affected by surface exposure of valuable minerals, grade of valuable mineral and collector dosage. For particles with high grade
of valuable metal, a dramatic reduction of attachment time was obtained with a small increase of collector dosage. However, in the case of particles with lower mineral grade, attachment time
was not influenced by collector addition.