PROCEDURE FOR ALUMINIUM-SILICON-THERMAL PRODUCTION OF FERRO-TUNGSTEN Russian patent published in 2011 - IPC C22C33/04 C22C27/04 

FIELD: metallurgy.

SUBSTANCE: procedure consists in staged loading and melting charge containing tungsten concentrate, iron scale, iron punching, lime, 75 % of ferrosilicon, and aluminium and in separation metal from slag. At the first stage charge is loaded at rate 220-260 kg/m² per min; charge contains 4-10 % of tungsten concentrate of its weight for melt, iron scale 5-20 % of its weight for melt and aluminium at amount of 0.8-0.98 of stoichiometric required amount for reduction of tungsten and iron in charge at the first stage. At the second stage charge is loaded at rate of 50-70 kg/m² per min; charge contains tungsten concentrate 90-96 % of its weight for melt, iron scale 80-95 % of its weight for melt, iron punching, lime at amount of 0.25 % of aluminium weight for melt, ferrosilicon at amount facilitating contents of silicon in charge 0.2-0.5 and aluminium at amount of 0.5-0.8 of stoichiometric required for reduction of tungsten and iron in charge at the second stage. Total amount of silicon and aluminium in charge at the first and second stages of melt is 0.95-1.0 of stoichiometric required for reduction of tungsten and iron. Upon charge melting there is loaded iron scale at amount of 1.0-1.3 of its consumption for two preceding stages for melt and it is heated for 0.2-0.3 of time of melt duration.

EFFECT: reduced specific consumption for reducer and upgraded quality of produced alloy.

2 cl, 1 tbl, 8 ex