Features and Flotation of Complex Cu-Pb-Zn Sulphides

Problems arising during flotation of complex Cu-Pb-Zn sulphide ores are in general of geological origin. The features of these ores are reviewed, stressing that mineralogical studies extending to process mineralogy are prerequisite for a consistent flotation process. Some examples affecting flotation are given. Flotation of such ores often requires intensive testing to develop an economically viable circuit configuration. Particular attention is paid to the use of depressants, namely sulphur dioxide and sulphides. Some of the recent research results and industrial experience on the production of selective copper and zinc concentrates are briefly discussed. A case study of flotation of a complex Cu-Zn sulphide ore is outlined.