The results of attachment time measured on concentrates were
correlated with their Cu grade and collector dosage added during conditioning of flotation pulp. As seen in Fig. 8, at constant
collector dosage, the higher the Cu grade, the lower the attachment
time. The reason for the drop in the attachment time is not only
due to the decrease of Cu grade but also because of the decrease
of Cu liberation with the increase of flotation time. In other words,
both Cu grade and Cu liberation affect the attachment time.