METHOD FOR PRODUCTION OF LITHIUM METANIOBATE AND LITHIUM METATANTALATE Russian patent published in 1997 - IPC

FIELD: production of compounds of rare elements, particularly, metaniobates and metatantalates of alkaline metals and solid solutions thereof for raising monocrystals and for manufacturing of electrotechnical ceramics. SUBSTANCE: hydroxide or compounds of niobium or tantalum is treated by lithium-containing solution or suspension, the process takes place at pH 3-8. Then reagents are added, their quantity is so that Li:Nb or Ta is more 1. Filtered precipitate is affected by heat treatment and washed by water. Treatment of niobium hydroxide or tantalum hydroxide is carried out preferably by chloride, nitrate or sulfate of lithium, said process takes place in the presence of lithium carbonate or lithium hydroxide. Treatment of compound of niobium or tantalum (chloride, oxychloride, sulfate or oxysulfate of niobium or tantalum) is preferably carried out by lithium carbonate or lithium hydroxide. EFFECT: improved efficiency. 3 cl, 2 tbl