This paper presents the results of laboratory studies performed on copper concentrate sample containing about 30 percent Cu and about 1.55 percent Pb. The objective of the study was to demonstrate that by combining chemical treatment and flotation one can obtain a concentrate with reduced lead content. As a result of pre-treatment of the sample with a 10% (by weight) ammonium acetate solution and subsequent flotation in the presence of a collector added at a ratio of 10 g/Mg, the material can be separated into two products: - one obtained at a yield of37%, containing about 44% copper and about 0.9% lead - and one containing about 19% Cu and up to 1.6% Pb. Thus obtained products can be directed to different copper-recovery metallurgical processes.