ethers, that is di(ethylene glycol) monoethyl C2E2 and
di(ethylene glycol) monobutyl C4E2, the recovery of
quartz is very low and remains constant with the reagent
concentration. It means that among all ethers tested in
this work, the latters can be used as selective ones during
the flotation of materials consisting of quartz and
carbonaceous copper shale.