FIELD: metallurgy, chemistry to extract crystals from a suspension through feeding the suspension into rotor-like suction filter during its filtering barrel revolution to perform a succession of operations concerning suction filtration, washing and further suction filtration. SUBSTANCE: method includes suction filtering with pressurizing suspension side, so as to support temperature and pressure on such a level not to attain conditions of oversaturation in filtrate of the rotor-like suction filter. EFFECT: prevention of filter blockage due to viscosity increase and precipitation of crystals from mother solution, extended crystal extraction. 2 dwg
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