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    • 35. 发明授权
    • Separation and recovery of molybdenum values from uranium process waste
    • 从铀工艺废物中分离和回收钼值
    • US4584184A
    • 1986-04-22
    • US612282
    • 1984-05-21
    • David NalewajekLynn E. McCurryDavid J. FriedlandRichard E. Eibeck
    • David NalewajekLynn E. McCurryDavid J. FriedlandRichard E. Eibeck
    • C01G39/00C01G39/02C01G43/00C01G43/01C22B7/00C22B34/34C22B60/02
    • C01G43/01C01G39/00C01G39/02C01G43/00C22B34/34C22B60/0247C22B7/008C01P2006/80Y02P10/234
    • A method for treating process waste consisting of uranium hexafluoride, UF.sub.6, molybdenum hexafluoride, MoF.sub.6 and molybdenum oxytetrafluoride, MoOF.sub.4 is provided wherein the foregoing mixture is hydrolyzed in an aqueous solution of ammonium carbonate and ammonium hydroxide. The resulting mother liquor is digested at 60.degree.-80.degree. C. to drive off carbon dioxide and convert the ammonium uranyl carbonate, (NH.sub.4).sub.4 UO.sub.2 (CO.sub.3).sub.3 to ammonium diuranate, (NH.sub.4).sub.2 U.sub.2 O.sub.7. The pH is maintained above 9 to prevent premature precipitation of the molybdenum values as molybdic acid or uranyl molybdate.The ammonium diuranate which forms as a yellow solid is filtered, slurried in aqueous ammonium hydroxide, filtered and dried. The yield is quantitative. Pyrolysis results in conversion of the diuranate salt to uranium oxide, U.sub.3 O.sub.8, of suitable purity to be recycled in the uranium hexafluoride production process. The combined filtrates which contain the molybdenum values and ammonium fluoride by-product are diluted, and stirred, with 95% ethanol to precipitate white, crystalline, ammonium molybdate, (NH.sub.4).sub.2 MoO.sub.4. The ammonium fluoride remains soluble. The ammonium molybdate is filtered, dried and calcined at 600.degree. C. for 2 hours to yield molybdenum trioxide, MoO.sub.3 in >90% yield and essentially free of uranium contamination. Fluoride contamination in either of the reprocessed materials is minimal.
    • 一种用于处理由六氟化铀,UF 6,六氟化钼,MoF 6和四氟化钼组成的处理废物的方法,其中上述混合物在碳酸铵和氢氧化铵的水溶液中水解。 将得到的母液在60°-80℃下消化以除去二氧化碳,并将碳酸铀酸铵(NH4)4UO2(CO3)3转化成二氢铀酸铵(NH4)2U2O7。 pH值保持在9以上,以防止钼值过早沉淀为钼酸或钼酸铀。 过滤形成黄色固体的二异氰酸铵,在氢氧化铵水溶液中浆化,过滤并干燥。 产量是定量的。 热解导致将二铀酸盐转化为具有合适纯度的氧化铀U3O8,以在六氟化铀生产过程中再循环。 将含有钼值和氟化铵副产物的合并滤液稀释,并用95%乙醇搅拌,沉淀出白色,结晶,钼酸铵(NH 4)2 OO 4。 氟化铵保持溶解。 将钼酸铵过滤,干燥并在600℃下煅烧2小时,得到三氧化钼,MoO 3> 90%产率,基本上不含铀污染物。 任何一种后处理材料中的氟化物污染最小。