Process for producing ingots by electric resistance melting particulate metal under slag

Abstract

Abstract A process for producing metal alloys in the form of large-size ingots, by melting under electro-conductive slag, wherein the material forming the alloy is partly supplied as solid metal and partly as metal in powder, granules or pellets, for conciseness called ''''particulate metal'''' comprising the sequential operations of: A. INTRODUCING INTO A MOLD, THE BOTTOM OF WHICH IS MADE OF ELECTRO-CONDUCTIVE MATERIAL, A CONSUMABLE-ELECTRODE UNIT, UNTIL CONTACTS THE SLAG; B. PARTIALLY FILLING WITH SAID PARTICULATE METAL A ZONE OR RECESS PROVIDED INSIDE SAID ELECTRODE UNIT AT ITS END CONTACTING THE SLAG, CLOSED AT ITS BOTTOM END BY A BOTTOM WALL, AND AT ITS TOP BY A FEEDING PLATE FOR THE POWDER METAL; C. ESTABLISHING IN SAID ZONE A CONTROLLED ATMOSPHERE BY A GAS CIRCULATION; D. INCREASING THE TEMPERATURE UNTIL OBTAINING THE GRADUAL MELTING OF SAID BOTTOM WALL AND THE GRADUAL SIMULTANEOUS SINTERING OF THE PARTICULATE METAL IN SAID ZONE UNTIL FORMING A SINTERED LAYER HAVING A THICKNESS SUFFICIENT TO SUPPORT THE WEIGHT OF THE SUPERPOSED PARTICULATE METAL; E. MELTING THE SO OBTAINED COMPOSITE ELECTRODE COMPRISING BOTH THE ELECTRODIC UNIT AND THE PARTICULATE METAL CONTINUOUSLY FED TO THE MELTING ZONE.

Inventors

• 👤 Paolo Bianchi
• 👤 Aldo Ramacciotti
• 👤 Eugenio Repetto

Bibliographic Details