NIOBIUM OXIDE POWDER (NB O ) AND A PROCESS FOR ITS PREPARATION

摘要

Title: Niobium oxide powder (Nb2O5) and a process for its preparation Niobium oxide powders in non-agglomerated form with a narrow particle size distribution range, high specific surface area, high purity and 2-20 ppm Fe and 2-30 ppm Ni usable in carbide preparation, ferro alloy melting and as a raw material for optical glasses and electroceramic and electro-optical products. The powders are made by precipitation from fluoride solution, filtering, washing, annealing and milling. The washing is carried out to an extent that annealing losses are 10-50 % by weight, the calcining is at 600.degree.C-1000.degree.C and the calcined product is finley ground. STA 11