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

摘要

1. A method for 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 crushed slag - a by-product aluminothermic production smelted and ligatures / or crushed lining crucible used for production of melted alloys, as well as superplasticizer, and SP-1 high alumina cement at mfd copulating crucibles for melting vanadium slag ligatures used with a molybdenum content of not more than 0.1%, iron - not more than 0.5%, molybdenum smelting ligatures - slag with a vanadium content not exceeding 0.1%, the crushed lining crucible used for melting ligatures vanadium or molybdenum, respectively, wherein the first mixed slag and / or crucible liner used with the plasticizer at the rate of 0.8-1.2 kg of plasticizer per 200 kg of slag and / or spent potlining, the mixture was diluted with water at the rate of 1 DMNA 14- 15 kg slag / oR USE Call lining, mixed until thoroughly wetted mixture is then introduced at the rate of high alumina cement 0.5-1.5 kg per 12-14 kg of slag and / or the used lining refractory mixture was stirred until a homogeneous mass, drying of the crucible is carried out by heating at a temperature of from 100 to 150 ° C for 2 ± 0,5 hours, after which the drying temperature is increased to 650 ° C and held for 10 ± 0,5 chasov.2. A method according to claim 1, characterized in that the high alumina cement containing only mono- and dialyuminat calcium (CaO CaO ∙ AlOi ∙ 2AlO) in a ratio of 1: 1.