FIELD: pulp cooling in chemical production of extraction phosphorus acid. SUBSTANCE: device has a case with nozzles for air and pulp inlet, pipes for air and pulp outlet, and grids made of elastic tubes (or bundles) with cross-section area changed in a step. Life time of the device is increased at the expense of imposing low-frequency oscillations of different frequency on foam bed generated by the elastic grid when gas and liquid interact on the grid. EFFECT: increased life time of the apparatus, decreased expenses for pulp pumping. 3 dwg
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