1. Uranyl nitrate was used to fuel Aqueous Homogeneous Reactors in the 1950s.2. Uranyl nitrate can be prepared by reaction of uranium salts with nitric acid.3. Uranyl nitrate is recovered by evaporating the solution.4. Ether was then added in a liquid liquid extraction process to separate the impurities from the uranyl nitrate . 5. The resulting " UNH " ( extraction tower to re-extract the uranyl nitrate from the kerosene into deionized water. 6. Criticality was reached upon the technicians adding a seventh bucket of an aqueous uranyl nitrate solution to the tank. 7. Mallinckrodt Incorporated in St . Louis, Missouri, took the raw ore and dissolved it in nitric acid to produce uranyl nitrate . 8. Current designs use nitric acid base solutions ( e . g . uranyl nitrate ) eliminating most of these problems in stainless steels. 9. For example, uranyl nitrate , UO 2 ( NO 3 ) 2, is soluble in diethyl ether because the solvent itself acts as a ligand. 10. The solid may be obtained by heating uranyl nitrate to 400 �C . Its most commonly encountered polymorph, ?-UO 3, is a yellow-orange powder.
