ベリリウムの分析化学的研究-18-

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The residue after estimation of loss of ignition of a beryl sample collected in Sugiyama district of Saga Pref. was fused with KOH-Na2CO3-HNO3 Mixture, treated with 80 % H2SO4, the H2SiO3 removed, the solution was neutralized with NaOH, the FeS and NiS were removed by treating the solution with H2S in acetate buffer solution, the filtrate was treated with NH4NO2 for precipitation of hydroxides of Al, Be and Fe (III), and for separation from Ca, Mg and Na. The precipitate was treated with ether-HCl mixture for removal of Fe, the Al was precipitated as Al oxinate, the filtrate was treated with conc H2SO4-HNO3 mixture for decomposistion of the excess oxine, the solution was neutralized with NaOH, Be(OH)2, was separated as a precipitate with NH4OH. Since the precipitate contained a small amount of H2SiO3, it was heated with HF and conc H2SO4 for removal of SiF4, the residue was heated to obtain a pure BeO, the BeO was treated with 80% H2SO4, concentrated and the residue recrystallized from hot water to give BeSO4·4 H2O. The beryl contained Si02.57.89, BeO11. 98, Fe203, 1. 02, Al2, O3 22. 43, CaO 1.18, Na2O 2. 26, and MgO 1.48%, with loss on ignition 1.82%. The stracture of beryl was close to 3 BeO · Al2O3 ·4 SiO2.
社団法人日本分析化学会の論文