METHOD OF PRODUCTION OF DOPED ALLOY CONTAINING REFRACTORY METALS TUNGSTEN AND MOLYBDENUM BY TECHNOLOGY OF LIQUID-PHASE REDUCTION Russian patent published in 1999 - IPC

FIELD: ferrous and nonferrous metallurgy, particularly, pyrometallurgical processes in which valuable components are reduced from liquid slag phase. SUBSTANCE: method includes slag melting under strictly defined conditions in compliance with the process of liquid-phase reduction, particularly, use of iron and lime-containing component in the form of oxygen-converter slag. Most suitable for normal running of process of processing of materials containing tungsten and molybdenum are highly basic slags characterized by basicity index CaO/SiO₂=1.5-2.0. Concentration of ferrous oxide in such slags is maintained at the level of 10-20%. This is due to the fact that ferrous oxide materially reduces viscosity of highly basic slags to extend interval of crystallization of the slags and increases concentration of doping elements in final alloy. Besides, highly basic slag bath prevents foaming of oxide melt to prevent undesirable situations involving spitting of slag from melting unit. The method allows recovery from wastes of tungsten and molybdenum into final alloy where their concentration considerably rises. The wastes containing refractory elements are practically not usable. EFFECT: higher efficiency. 2 cl, 2 dwg