Interaction of Uranyl Ions with Synthetic Zeolites of Type a and the Formation of Compreignacite-like and Becquerelite-like Products
نویسنده
چکیده
Ahstraet--Uranyl acetate solutions, ranging in concentration from about 100 ppm to 3700 ppm, were reacted with the Na-, K-, and Caforms of zeolite A. The crystalline products from the Naand K-A zeolites resembled compreignacite (K~O-6UO3' l lH~O) and from the Ca-A, becquerelite (CaO'6UO3. l lH~O). With higher concentrations of uranyl acetate, only X-ray-amorphous products were obtained. The compreignacite-like products gave sharp X-ray powder diffraction patterns and were indexed with orthorhombic, quasi-hexagonal unit cells which showed a significant variation of the axial ratio b/a from values just greater than, to values just less than X/3. The becquerelite-like phase was always accompanied by unreacted zeolite. Compreignacite was synthesized from uranyl acetate and KOH solutions at room temperature over a period of several days. Key Words--Becquerelite, Compreignacite, Synthesis, Uranium, X-ray powder diffraction, Zeolite A.
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