| 摘要 |
FIELD: metallurgy.SUBSTANCE: invention relates to metallurgy and can be used for out-of-furnace production of metals and alloys in the oxidic metallothermic processes proceeding due to heat emission in chemical reactions of reduction of metals from oxides or concentrates. In the method the exothermic furnace charge is loaded on the gas-permeable compacted fire-resistant backfill on the bottom of the fore-hearth and into the thin-walled cylinder which is pre-installed in the shaft of melting furnace coaxially to its punched walls. The space between the thin-walled cylinder, walls of the fore-hearth and the furnace shaft is filled up with granular gas-permeable fire-resistant material, then the thin-walled cylinder separating the metallothermic furnace charge and granular fire-resistant material is removed, furnace charge is filled up from above with also granular gas-permeable fire-resistant material, the beginning of exothermic reaction is initiated during which the drainage removal of gases through gas-permeable fire-resistant material and the punched horn walls is performed. The melting furnace is fitted with a vacuumiser and the gas-tight fire-resistant gasket separating gas-permeable fire-resistant material of furnace shaft and the fore-hearth the internal diameter of which is equal to that of the named thin-walled cylinder, and external diameter is equal to that of the bearing flange of the furnace shaft, while the walls of the fore-hearth are made with holes, and on its internal surface the metal grid is fixed, and the fore-hearth is interfaced with the vacuumiser and tightly connected to the furnace shaft housing along the perimeter through the named gas-tight gasket to provide the conditions of pumping out of metal directly into the fore-hearth volume.EFFECT: invention allows to increase density of metal structure and to reduce in it the concentration of residual gases by vacuumising of metal at the final stage of melting.2 cl, 5 dwg, 1 tbl |
