METHOD OF PRODUCING BARRIER METAL POWDER Russian patent published in 2011 - IPC B22F9/18 

FIELD: process engineering.

SUBSTANCE: invention relates to powder metallurgy and can be used in producing high purity powders of tantalum and niobium with high specific surface for production of volume-porous anodes of capacitors. Initial mix material containing compound of barrier metal, i.e. fluorotantalate or potassium fluoroniobate, and alkaline metal halogenid, i.e. sodium chloride, potassium chloride or mix thereof, is loaded into tight rector. Skull layer of alkaline metal halogenid is produced on reactor inner surface in presence of alloy additive, i.e. sulfur, phosphorus or mix thereof. Said mix is heated in argon atmosphere to produce melt and liquid alkaline metal is fed into reactor. Recovery of barrier metal compound is carried out at melt temperature of 600-900°C and on mixing the melt in turbulent conditions along with gradual melting of skull layer. In recovery of barrier metal compound, alkaline metal halogenid powder with alloy additive is added into reactor. Total amount of alloy additive makes 0.005-0.05 wt % of barrier metal compound, while amount of added, alkaline metal halogenid powder is defined by the protected formula. Formed reaction mass containing barrier metal powder and alkaline metal halogenid is crystallised to wash barrier metal powder off alkaline metal halogenid.

EFFECT: stable recovery, high efficiency.

4 cl, 6 ex, 1 tbl