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A major producer of zinc on the Balkans is Bulgaria (about 100 000 tons per year). The two zinc plants in Plovdiv and Kardjali deliver a part of the necessary raw materials from Bulgaria and the Balkan countries – Turkey, Romania, Greece, Serbia and Macedonia. In this connection an analysis is made of the delivered sulfide zinc concentrates through statistical processing of data about their chemical content. For the aim of processing them according to the classic hydrometallurgical scheme studies are carried out...