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18 条记录 (耗时 0.028 秒)

    Production method for obtaining pressable powder yielding high sinter density pellets without defects
    3.
    发明授权
    Production method for obtaining pressable powder yielding high sinter density pellets without defects 失效
    获得可产生高烧结密度的颗粒的可压制粉末的生产方法，没有缺陷

    公开(公告)号：US5702676A

    公开(公告)日：1997-12-30

    申请号：US667795

    申请日：1996-06-20

    申请人： Richard I. Larson ,  Stephen E. Selby ,  Michael P. Enger

    发明人： Richard I. Larson ,  Stephen E. Selby ,  Michael P. Enger

    IPC分类号： C01G43/025

    CPC分类号： C01G43/025 ,  C01P2006/10 ,  C01P2006/12

    摘要： This invention provides an improved process of preparing UO.sub.2 powder from poor quality, partially oxidized powder containing organic and inorganic impurities. The process is illustrated in the flow chart of FIG. 1 which includes the steps of (a) oxidizing a uranium-containing scrap also containing inorganic and cationic organic impurities; (b) solubilizing, typically with nitric acid, the uranium contained in the oxidized scrap to produce uranyl nitrate; (c) solvent extracting the solubilized product of step (b) to remove cation impurities to provide a purified uranyl nitrate solution; (d) precipitating the purified uranyl nitrate with ammonia to form ammonium diuranate powder; and (e) calcining and passivating the ammonium diuranate powder to produce UO.sub.2 powder; and optionally (f) forming the UO.sub.2 powder of step (e) into pellets and sintering the formed pellets to produce sintered UO.sub.2 pellets.

    摘要翻译： 本发明提供了一种由劣质的部分氧化粉末制备含有机和无机杂质的氧化铝粉末的改进方法。 该过程在图5的流程图中示出。 1，其包括以下步骤：（a）氧化含有无机和阳离子有机杂质的含铀废料; （b）通常用硝酸溶解氧化废料中所含的铀以产生硝酸铀酰; （c）溶剂萃取步骤（b）的溶解产物以除去阳离子杂质以提供纯化的硝酸铀酰溶液; （d）用氨沉淀净化的铀酰硝酸铀以形成十二烷酸铵粉末; 和（e）煅烧和钝化二异氰酸铵粉末以产生UO2粉末; 和（f）将步骤（e）的UO 2粉末形成颗粒并烧结所形成的颗粒以制备烧结的UO2颗粒。

    Method and apparatus for blending fine and cohesive powders in a fluidized bed with gas injection through ball valves
    5.
    发明授权
    Method and apparatus for blending fine and cohesive powders in a fluidized bed with gas injection through ball valves 失效
    在流化床中通过球阀喷射气体的方法和装置

    公开(公告)号：US4168914A

    公开(公告)日：1979-09-25

    申请号：US803727

    申请日：1977-06-06

    申请人： Richard I. Larson ,  John T. Adomitis ,  Thomas G. Beckingham

    发明人： Richard I. Larson ,  John T. Adomitis ,  Thomas G. Beckingham

    IPC分类号： B01F13/02 ,  B01J8/18 ,  G21C21/02

    CPC分类号： B01J8/1818 ,  B01F13/0294 ,  Y10S423/16

    摘要： A mixture of fine and cohesive powders is blended to complete homogeneity in a nuclear-safe bubbling-bed fluidized bed blender having an improved fluidizing grid. The blender includes a generally vertically-oriented slab-shaped, nuclear-safe mixing vessel having a fluidizing grid disposed at one end of the vessel. The fluidizing grid comprises a linear array of generally downwardly-directed, pyramidal-shaped hoppers each having walls converging into a conically-shaped opening. A plurality of ball valves are employed, one such valve being disposed at the bottom of each hopper. The rotary closure member of each of the ball valves includes a first set of gas orifices for directing a flow of fluidizing gas upwardly in a divergent swirl-shaped pattern along the walls of each of the hoppers. In one embodiment a second set of fluidizing gas orifices for directing a flow of fluidizing gas downwardly into the apex of each of the hoppers is also provided. During blending, fluidizing gas is supplied to the first set of orifices, or to a combination of the first and second sets of orifices, in an amount sufficient to cause bubbles of fluidizing gas to rise through the mixture of powders and emerge from the top surface of the powders until a homogeneous blend of powders is achieved.

    摘要翻译： 混合精细和粘性粉末的混合物以在具有改进的流化网格的核安全鼓泡床流化床混合器中完成均匀性。 该混合器包括一个大致垂直取向的板状的核安全混合容器，其具有设置在容器一端的流化栅格。 流化栅格包括大致向下定向的金字塔形的料斗的线性阵列，每个具有会聚到锥形开口的壁。 使用多个球阀，一个这样的阀设置在每个料斗的底部。 每个球阀的旋转关闭构件包括第一组气体孔，用于沿着每个料斗的壁沿着发散的漩涡形图案向上引导流化气体流。 在一个实施例中，还提供了用于将流化气体向下引导到每个料斗的顶点的第二组流化气体孔。 在混合期间，将流化气体以足以使流化气体的气泡上升通过粉末混合物并从顶表面出来的量将第一组孔口或第一组孔口的组合供应到第一组孔口 的粉末，直到达到均匀的粉末混合物。

    Decontamination process
    6.
    发明授权
    Decontamination process 失效
    净化过程

    公开(公告)号：US5473648A

    公开(公告)日：1995-12-05

    申请号：US228776

    申请日：1994-04-18

    申请人： Richard I. Larson ,  Michael R. Chilton

    发明人： Richard I. Larson ,  Michael R. Chilton

    IPC分类号： G21F9/28 ,  C22B34/14 ,  C23G1/10 ,  G21C19/42

    CPC分类号： C22B34/14 ,  G21Y2004/60

    摘要： The present invention relates to a process of decontaminating zirconium-based alloy claddings tubes used in nuclear reactor fuel rods. The process involved the use of a permanganate in a dilute acid solution. The process renders the alloy suitable for uncontrolled release into a non-radioactive environment.

    摘要翻译： 本发明涉及在核反应堆燃料棒中使用的锆基合金包层管的净化方法。 该方法涉及在稀酸溶液中使用高锰酸盐。 该方法使合金适合不受控制地释放到非放射性环境中。

    Binder system for the manufacture of nuclear pellets, and the method and product thereof
    7.
    发明授权
    Binder system for the manufacture of nuclear pellets, and the method and product thereof 失效
    用于制造核粒料的粘合剂体系及其方法和产品

    公开(公告)号：US4816187A

    公开(公告)日：1989-03-28

    申请号：US22032

    申请日：1987-03-05

    申请人： Richard I. Larson ,  Richard P. Ringle

    发明人： Richard I. Larson ,  Richard P. Ringle

    IPC分类号： C04B35/51 ,  G21C3/62 ,  G21C21/00 ,  C07F5/00 ,  C09K11/04

    CPC分类号： C04B35/51 ,  G21C3/623 ,  Y02E30/38

    摘要： A fugitive binder composition for compression molding uranium dioxide nuclear fuel comprising the reaction product of a strongly alkali water solution of a diamine and oxalate ions with uranium oxide which is free of carbonates and carbamates, and having the formula:[.sup.+ NH.sub.3 (CH.sub.2).sub.2 NH.sub.3.sup.+ ][UO.sub.2 (C.sub.2 O.sub.4).sub.2 (H.sub.2 O).sub.2 ][.sup.+ NH.sub.3 (CH.sub.2).sub.2 NH.sub.3.sup.+ ].

    摘要翻译： 一种用于压缩二氧化铀核燃料的短暂的粘结剂组合物，其包含二胺和草酸根离子的强碱性水溶液与不含碳酸盐和氨基甲酸酯的氧化铀的反应产物，并具有下式：[+ NH 3（CH 2）2 NH 3 + ] [＆upbar＆UO2（C2O4）2（H2O）2] [+ NH3（CH2）2NH3 +]。

    Method and apparatus for adding and mixing second cohesive powders in a fluidized bed blender
    10.
    发明授权
    Method and apparatus for adding and mixing second cohesive powders in a fluidized bed blender 失效
    在流化床搅拌机中添加和混合第二粘性粉末的方法和装置

    公开(公告)号：US4406410A

    公开(公告)日：1983-09-27

    申请号：US346874

    申请日：1982-02-08

    申请人： Richard I. Larson ,  Henry C. Brassfield ,  John T. Adomitis

    发明人： Richard I. Larson ,  Henry C. Brassfield ,  John T. Adomitis

    IPC分类号： B01F13/02 ,  B02C19/06 ,  B02C19/12

    CPC分类号： B02C19/06 ,  B01F13/02 ,  B01F13/0294

    摘要： A method and apparatus for the introduction of second cohesive powders into an improved fluidized bed blender containing UO.sub.2 powder, and for blending such second cohesive powders with the UO.sub.2 powder in the fluidized bed blender. The apparatus comprises an eductor, an improved pressurized vortec mill, a pneumatic conveying system that operates in turbulent flow, and an improved fluidized bed blender. The method and apparatus provide for injection and uniform dispersion of a second cohesive powdered ingredient or ingredients having hydrophobic, hydrophilic or hygroscopic properties in the fluid bed blender adjacent the bottom of the fluidized bed therein during the blending operation, thereby minimizing entrainment of the second powder mixture and providing a homogeneous blend of powders.

    摘要翻译： 一种用于将第二粘性粉末引入含有UO 2粉末的改进的流化床混合器中的方法和装置，并且用于在流化床混合器中将这种第二粘性粉末与UO 2粉末混合。 该设备包括喷射器，改进的加压涡旋磨机，在湍流中操作的气动输送系统和改进的流化床搅拌器。 该方法和装置在共混操作期间提供了在邻近流化床底部的流化床搅拌器中具有疏水性，亲水性或吸湿性的第二粘性粉末成分或成分的注射和均匀分散，从而最小化第二粉末的夹带 混合物并提供均匀的粉末混合物。