DIAMINE FLOTATION OF QUARTZ

The flotation of Quartz was studied as a function of pH when using N-alkyl-1, 3 diaminopropanes and n-dodecylamine as collectors. The alkyl chains of the diamines were 8, 12 and 16 carbons in length. Two collector concentrations were used and flotation studied in the absence of additives and in the presence of NaCl. The chain length effect on flotation using the diamines is comparable to that observed in quartz flotation using monoamines. The NaCl, in the concentrations studied, functions as a depressant for the mineral. The 12 C diamine is a stronger collector for quartz than the 12 C monoamine. Probable surface chemical phenomena giving rise to the observed experimental results are discussed. In particular, the importance of the doubly charged diamine species in promoting flotation is demonstrated.