Advanced technology for iron-chrome alloys production and related plant

摘要

A method for producing ferro-chrome alloys comprising a stoichiometric charge and stoichiometric slag calculation step, a step of making the plant and the crucible furnace operate at normal regime, steps of casting the metal and the slag, a step of collecting the molten metal in suitable modular molds made from spheroidal graphite cast iron, a step of removing the ingots contained in the molds with suitable pincer means, a step of collecting the slag in suitable nonrefractory bells or ladles, characterized in that the metal-slag separation takes place directly inside the furnace and in that said castings of metal and slag take place in successive steps so as to allow the drawing off of the liquids in the amounts formed between one casting and the next.

主权项

1. Method for producing ferro-chrome alloys comprising a stoichiometric charge and a stoichiometric slag calculation step, a step of making a plant and a crucible furnace to operate, steps of casting of metal and slag, a step of collecting molten metal in modular molds made from spheroidal graphite cast iron, a step of removing ingots contained in modular molds using pincer means, a step of collecting the slag in non-refractory bells or ladles, wherein metal-slag separation takes place directly inside said furnace and wherein said castings of metal and slag take place in successive steps so as to allow tapping in an amount formed between one casting and the next; and wherein said slag is made up of:
Cr2O3 in a concentration between 2.5-2.8% of slag volume, SiO2 in a concentration of between 42.0-44.0% of slag volume, Al2O3 in a concentration of between 12.0-13.0% of slag volume, MgO in a concentration of between 34.0-36.0% of slag volume, CaO in a concentration of between 1.0-2.0% of slag volume, FeO in a concentration of between 0.6-0.8% of slag volume.