FIELD: process of extraction, dissolution, leaching of metals in a solid phase by pickles. SUBSTANCE: a multisectional drum apparatus is offered for processing of lump material, for example, foiled textolite. The drum has annular partitions 5 and bent blades 7 positioned inside it. The drum sections are provided with pipe-lines 10, 13 for feeding of reaction mixture and water. The middle section is made with annular perforated shell 17. EFFECT: enhanced capacity, mechanized process, protected environment. 1 cl, 4 dwg
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