FIELD: chemical treatment of reagents. SUBSTANCE: plasma torch 1 has two or more tubular electrodes 2,3 placed coaxially one inside the other. Reagent feed pipe 4 is arranged coaxially in inner electrode 3. Pipe 4 has liquid cooled pipe with heat insulating layer 10, 11 on outer surface. Pipe 4 can be shifted axially to position nozzle relative to plasma torch. Lower portion of feed pipe 4 is made replaceable. Pipe narrows at outlet hole forming Venturi nozzle to increase reagent velocity. Circular channel is formed between feed pipe and inner electrode into which plasma forming gas 13 can be delivered. EFFECT: improved quality of treatment. 2 cl, 1 dwg
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