Tests of chromic oxide refractories in equipment for the manufacture of glass fiber

Abstract

CONCLUSIONSLine production of unfired periclase-graphite nozzles and collector-nozzles with iignosu!fonate binder, which have obtained wide use in teeming of steel through slide gates, has been developed and introduced.A method for holder-enclosed unfired periclase-graphite collector-nozzleswith phosphate binder providing normal teeming of two heats from 100-ton ladles has been developed.The results of service tests of unfired nozzles and inserts with phosphate binder in a number of plants have provided stable stopper teeming of various types of steel and have shown the possibility of replacement of fired parts by them.Replacement of fired nozzles and inserts with unfired ones makes it possible to shorten the production cycle by three times, to save 150 kg of standard fuel per ton of parts, and to eliminate the laborious operations of loading on the kiln cars and scrap for heat cracks, deformation, and out-of-roundness of the circumference of the channel.