METHOD OF CLEANING HEAT-EXCHANGE APPARATUS FROM BAUXITE PULP

摘要

FIELD: production of alumina; autoclave leaching of bauxite. SUBSTANCE: proposed method includes washing of tubular part of heat-exchange pulp-to-pulp preheater with steam and condensate at simultaneous circulating washing of inter-tube part with hot water. Inter-tube part is periodically (every 2-4 months) subjected to circulating chemical cleaning after washing with water by means of caustic alkali solution or high-modulus aluminate alkali solution at addition of lime. EFFECT: enhanced efficiency due to increased average temperature of regenerative heating of pulp and reduced consumption of live steam. 2 cl, 1 dwg