METHOD OF PREPARING NIOBIUM HYDROXIDE Russian patent published in 2000 - IPC

FIELD: synthesis of inorganic compounds, more particularly synthesis of niobates. SUBSTANCE: solid niobium pentachloride is treated with ammonia solution with concentration of 6-9.5 moles at S:L ratio of 1:(3-5). Precipitate is washed with water by decantation to pH of 7-7.5 and negative quality reaction to detect chloride ion. The precipitate is filtered, washed and dried under standard conditions to prepare niobium hydroxide having Nb₂O₅ content of higher than 70% and residual chloride ion concentration of less than 0.05%. EFFECT: more efficient preparation method. 1 ex, 1 tbl