HZr_2(PO_4)_3によって固定化されたアルカリ及びアルカリ土類金属元素の浸出特性

概要

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Mixtures of crystalline proton type zirconium phosphate, HZr_2(PO_4)_3, with M^INO_3 (M^I = Li, Na, K, Rb, Cs) and M^<II>(NO_3)_2 (M^<II> = Mg, Ca, Sr, Ba) were thermally treated at 700℃ for 5 h, in order to investigate the immobilization of M^I and M^<II>. All M^I and M^<II> immobilized products gave X-ray diffraction (XRD) patterns attributable to M^IZr_2(PO_4)_3 and M^<II>Zr_4(PO_4)_6 with a NASICON-type structure, and had the same crystal state as HZr_2(PO_4)_3. The α-axis lattice constant of M^IZr_2(PO_4)_3 and M^<II>Zr_4(PO_4)_6 decreased monotonically with increasing the ionic radius of M^I and M^<II>, respectively, while the c-axis lattice constant increased. The electrical conductivity of M^IZr_2(PO_4)_3 and M^<II>Zr_4(PO_4)_6 sintered at 1400℃ decreased with increasing the ionic radius of M^I and M^<II>, respectively. Leaching tests for M^IZr_2(PO_4)_3 and M^<II>Zr_4(PO_4)_6 were carried out at 160℃ for 24 h in 1 mol・dm^<-3>-HCl. The leaching rate decreased with increasing ionic radius of M^I and M^<II>, except for the case of Rb and Cs in M^IZr_2(PO_4)_3 and Sr and Ba in M^<II>Zr_4(PO_4)_6.
社団法人日本セラミックス協会の論文
2003-05-01