PROCESS FOR PRODUCING POWDERS OF METALS FROM GROUP IVb (Ti,Zr,Hf) ,Vb (V,Nb,Ta) AND VIb (Cr,Mo,W) OF THE PERIODIC SYSTEM OF THE ELEMENTS AND ALLOYS THEREOF

摘要

The invention relates to the production of valve metal powders, in particular, tantalum powders by reduction of a corresponding valve metal compound, for example, K2TaF7, with an alkali metal in the presence of a diluent salt, whereby the reduction is carried out in the presence of a particle diminution agent, preferably, Na2SO4, which is added to the reaction mixture continuously or in aliquots.