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Lead-zinc sulphide ore contains lead sulphide(galena),and zinc sulphide(sphalerite).In the first flotation stage,galena is rendered hydrophobic with an organic collector such as diethyldithiocarbamate(DDTC),while sphalerite is kept from floating by depressants such as ZnSO4,and in the second flotation stage,activator such as CuSO4 was used to activate zinc flotation.