Uranium nitrates

Crystals of uranium nitrate are triboluminescent. Uranium salts have also been used for producing yellow "vaseline" glass and glazes. Uranium and its compounds are highly toxic, both from a chemical and radiological standpoint. 

J. M. Leitnaker, M. L. Smith, md C. M. Fitzpatrick, Conversion of Uranium Nitrate to Ceramic Grade Oxidefor the Eight-Water Breeder Reactor Process Development, ORNL-4755, Oak Ridge National Laboratory, Oak Ridge, Term., 1972. 

Uran-metail, n. uranium metal, -nitrat, n. uranium nitrate. 

Uranyl Nitrate (Uranium Nitrate, UNH, Yellow Salt). U02(N03)2.6H20, mw 502.18, N 5.58% yellow rhomb crysts, greenish luster by reflected light mp 60.2°, bp 118°, d 2.807g/cc, RI 1.4967. Sol in 1.5p w, freely in ale and eth. Prepd by the action of nitric acid on U octoxide. When shaken, rubbed, or crushed, the crysts show remarkable triboluminescence with occasional detonations. It is highly toxic, and a severe fire and expln risk when shocked or heated,... 

URANYL NITRATE Uranium nitrate Radioactive Material i (1 0 oxy... 

Yellow crystals, having a greenish luster by reflected light, and efflorescing superficially in dry air. Uranium nitrate is easily soluble in water, alcohol, and ether. The aqueous solution is acid to litmus paper. 

Alkali Salts. — On igniting 1 gm. of uranium nitrate, treating the residue with 20 cc. of water, filtering, and evaporating the filtrate, no weighable residue should remain. 

Earths. — The solution of 1 gm. of uranium nitrate in 20 cc. of water should remain clear on the addition of ammonia water and ammonium carbonate solution in excoss. 

Cyclopentanone has been prepared from adipic acid by distilling the calcium salt,1 heating alone 2 or with acetic anhydride,3 or in the presence of various catalysts such as barium hydroxide,4 thorium oxide,5 manganous oxide,5 uranium nitrate,6 ferrous sulfate 6 and others.7... 

Principle of Separation. Uranium forms a nitrate complex that is extractable into ethyl acetate (as well as other organic extractants). Thorium does not readily form an extractable nitrate complex. When ethyl acetate is contacted with an aqueous solution, the uranium-nitrate complex is partitioned favorably into the ethyl acetate whereas thorium nitrate is not. The distribution of the metal ion between the two phases is expressed as D = Corganic/Caqueous where C is the concentration in moles or dps per unit volume in the respective phases. The thorium remains in the aqueous phase and is precipitated as the hydroxide for counting. 

Uranyl carbonyl ferrocyanide, (U02)3[Fe(CN)5C0]25H20, is obtained2 as an orange-yellow gelatinous precipitate on adding the potassium salt to uranium nitrate. At 70° C. it becomes red, but acquires the yellow colour again on powdering. 

Hexavalent. Nitrate complexation with actinide ions is very weak, and the determination of the formation constants for aqueous nitrate solution species is extremely difficult. Under aqueous conditions with high nitric acid concentrations, complexes of the form An02(N03)(H20)x+, An02(N03)2(H20)2, and An02(N03)3 (An = U, Np, Pu) are likely to be present. Solids of the anionic trisnitrato complex have been isolated for U and Np however, minimal structural data have been obtained. Solid uranyl nitrate, U02(N03)2-xH20, is obtained as the orthorhombic hexahydrate from dilute nitric acid solutions and as the trihydrate from concentrated acid. The Np analog can be precipitated from a mixed aqneons HNO3 and MeCN solntion by the addition of 18-crown-6. Multiple structural determinations have been made for the hexavalent uranium nitrate complexes, and all show the common formula unit of... 

After the purification cycles, the dilute plutonium nitrate solution is concentrated to ca. 250 g/L and the uranium nitrate solution to ca. 450 g/L. 

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