METHOD OF PRODUCTION OF CERAMIC CRUCIBLES FOR ALUMINOTHERMIC SMELTING OF MAIN ALLOYS OF THE RARE REFRACTORY METALS

摘要

A method of manufacturing ceramic crucibles for melting aluminothermic ligatures rare refractory metals, comprising forming a crucible of refractory mass, exposure, drying and cooling the crucible, wherein the crucible is made of a refractory mass which is prepared by mixing 5-15% aqueous solution of soda ash with slag - byproduct production aluminothermic melted alloys, the rate of 0.07-0.15 l aqueous solution of sodium carbonate per 1 kg of slag, wherein during the manufacture of crucibles for melting ligatures Vanad Ia using slag with a molybdenum content of not more than 0.1%, iron - not more than 0.5%, molybdenum smelting ligatures - slag with a vanadium content of not more than 0.1%, drying the crucible is carried out by heating at a temperature of from 100 to 150 ° C for 1.0-1.5 hours, after which the drying temperature is increased to 600-800 ° C and held for 9.5-11 hours.