초록 ▼

The process comprises the reduction of niobium and/or tantalum oxides by means of alkaline earth metals and/or rare earth metals, wherein the first reduction stage is carried out as far as an average composition corresponding to (Nb, Ta)O.sub.x where x=0.5 to 1.5 and before the second stage the redu

The process comprises the reduction of niobium and/or tantalum oxides by means of alkaline earth metals and/or rare earth metals, wherein the first reduction stage is carried out as far as an average composition corresponding to (Nb, Ta)O.sub.x where x=0.5 to 1.5 and before the second stage the reduction product from the first stage is freed from alkaline earth oxides and/or rare earth metal oxides which are formed (and optionally from excess alkaline earth metal and/or rare earth metal) by washing with mineral acids.

대표청구항 ▼

[ What is claimed is:] [1.] A process for producing niobium and/or tantalum powders by the reduction of their corresponding niobium and/or tantalum oxides, wherein the reduction is carried out in two stages using a reducing agent selected from the group consisting of alkaline earth metals and rare e

[ What is claimed is:] [1.] A process for producing niobium and/or tantalum powders by the reduction of their corresponding niobium and/or tantalum oxides, wherein the reduction is carried out in two stages using a reducing agent selected from the group consisting of alkaline earth metals and rare earth metals, the process comprising:conducting the first reduction stage using said reducing agent until an average composition corresponding to (Nb,Ta)O.sub.x where x=0.5 to 1.5 is reached,washing the reduction product from the first reduction stage with one or more mineral acids to remove oxides of the reducing agent, and thenconducting the second reducing stage with said reducing agent to produce powder of the metal.