膨潤性フッ素雲母-リン酸アルミニウム複合体の生成

抄録

The formation of the complex between synthetic fluorine micas, Li-taeniolite [LiMg₂Li (Si₄O₁₀)F₂] and Na-F-hectorite [Na_1/3Mg_{2 2/3}Li_1/3(Si₄O₁₀)F₂], and aluminum phosph ate was studied at various reaction conditions in order to elucidate the factors affecting the reaction and mechanism of complex formation. The complexes were formed from the suspension of fluorine micas in the solution of AlCl₃, Ca(OH)₂ and H₃PO₄ in certain concentration ranges. The compositions of interlayered materials and basal spacings of the complexes varied with the concentration of solution, the reaction time, and the particle size and layer charge of starting samples. The interlayered materials can be generally expressed as n[Al(PO₄)x(OH)y], where PO₄/Al ratio increases with reaction time and finally tends to converge to a value in the range of 0.8∼M.9. These results suggest that the aluminum phosphate complex is formed through an intermediate, so-called Al-hydroxy complex.