| 摘要 |
1320029 Iron and uranium antimonates SNAM PROGETTI SpA 16 Got 1970 [16 Oct 1969 (3)] 49367/70 Heading C1A [Also in Division C2] An iron antimonate is prepared by melting Fe(NO 3 ) 3 .6H 2 O, adding to the melt small quantities of Sb 2 O 3 and heating the mixture until all nitrous oxide vapours, the compound then being activated by heating consecutively for 12 hrs. at 150‹ C., 16 hrs. at 400‹ C., 12 hrs. at 650‹ C., 12 hrs. at 750‹ C. and 48 hrs. at 850‹ C. A uranium antimonate was prepared by dissolving metallic antimony dust in conc. HNO 3 , dissolving uranyl nitrate in water, combining the the two solutions and adjusting the pH of the combined solutions to about 8 by adding aqueous ammonia, the precipitate then being filtered, washed and, after the addition of 30% NH 4 HCO 3 calcined at 750‹ C. |
