| abstract |
(57) [Summary] An alkali metal, a transition metal, particularly Sr, Ca, An object of the present invention is to provide a method for producing high-purity barium nitrate which is useful as a raw material for optical glasses such as optical cables and steppers in which Cl or the like is reduced to several ppm or less and Fe is reduced to 100 ppb or less. SOLUTION: The first step of dissolving crude barium nitrate, an oxidizing agent and an alkali in water, the second step of removing insoluble components from the aqueous solution of crude barium nitrate obtained in the first step, and the removal of insoluble components obtained in the second step A method for producing high-purity barium nitrate, which comprises a third step of adding high-purity barium nitrate by adding nitric acid to the subsequent aqueous solution to precipitate barium nitrate. |