| 摘要 |
PCT No. PCT/GB91/00781 Sec. 371 Date Sep. 15, 1992 Sec. 102(e) Date Sep. 15, 1992 PCT Filed May 17, 1991 PCT Pub. No. WO91/17955 PCT Pub. Date Nov. 28, 1991.Crystals of the Zeolite Analcime (Analcite) Na2O.Al2O3.4SiO2.2H2O are provided having a largest dimension greater than 50 micron. A method for preparing such crystals by mixing aqueous solutions of aluminium sulphate and sodium metasilicate, allowing a gel to form then heating, is provided. The presence of an organic water-miscible base encourages an increased crystal size. The crystals retain water strongly and a use for them in long term immobilisation of tritiated waste water is provided.
|
