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    • 4. 发明授权
    • Uranium recovery from UF6 cylinders
    • UF6气瓶的铀回收
    • US09382129B2
    • 2016-07-05
    • US13776785
    • 2013-02-26
    • TRANSPORT LOGISTICS INTERNATIONAL, INC.
    • Ronald O. Noe
    • C01G43/00C01G43/01C23G1/02
    • C01G43/01C01G43/00C22B60/023C23G1/02
    • A process for recovering residual uranium from emptied uranium hexafluoride shipping cylinder during cleaning, including rinsing a uranium hexafluoride shipping cylinder with hydrofluoric acid to dissolve a heel of uranium hexafluoride therein to form a mixture of sediment, precipitates and a uranium solution; separating the uranium solution from the sediment and precipitates; mixing sodium hydroxide with the uranium solution to precipitate sodium diuranate; separating the solid sodium diuranate from the sodium fluoride solution formed; re-dissolving the sodium diuranate in sodium carbonate solution to form uranyl carbonate complex solution; and adjusting the pH of uranyl carbonate complex solution further to precipitate uranyl peroxide with the addition of hydrogen peroxide. Sodium fluoride solution produced is further treated to remove fluoride by percolating it through a calcite limestone bed to form calcium fluoride solid.
    • 包括在清洗过程中从排空的六氟化铀运输工具缸中回收残余铀的过程,包括用氢氟酸冲洗六氟化铀运输工具,以溶解其中的六氟化铀,以形成沉淀物,沉淀物和铀溶液的混合物; 从沉淀物中分离铀溶液并沉淀; 将氢氧化钠与铀溶液混合以沉淀二氢化钠; 从形成的氟化钠溶液中分离固体二异氰酸钠; 将溶解在碳酸钠溶液中的阿魏酸钠再溶解形成碳酸铀酰复合溶液; 并通过添加过氧化氢进一步调节碳酸铀酸酯配位体溶液的pH以进一步沉淀二氧化铀过氧化物。 进一步处理生产的氟化钠溶液以通过将其渗透通过方解石石灰石床除去氟化物以形成氟化钙固体。
    • 7. 发明授权
    • Method for preparing uranium concentrates by fluidized bed precipitation, and preparation of UO3 and U3O8 by drying/calcining said concentrates
    • 通过流化床沉淀制备铀浓缩物的方法,通过干燥/煅烧所述浓缩物制备UO 3和U 3 O 8
    • US08628733B2
    • 2014-01-14
    • US13127942
    • 2008-11-07
    • Bruno CourtaudFrederic AugerJacques Thiry
    • Bruno CourtaudFrederic AugerJacques Thiry
    • C01G43/00
    • C01G43/00C01G43/01C01P2004/03C01P2004/61C01P2006/10
    • Method for producing a uranium concentrate in the form of solid particles, by precipitation from a uranium-containing solution using a precipitating agent, in a vertical reactor comprising a base, a top, a central part, an upper part, and a lower part, the solid particles of the uranium concentrate forming a fluidized bed under the action of a rising liquid current which circulates from the base towards the top of the reactor successively passing through the lower part, the central part and the upper part of the reactor, and which is created by introducing a liquid recycling current (flow) at the base of the reactor, said liquid recycling current being tapped at a first determined level (A) in the upper part of the reactor and sent back without settling to the base of the reactor, excess liquid being also evacuated via an overflow located at a second determined level (B) in the upper part of the reactor; a method in which the upper limit (C) of the fluidized bed of solid particles is controlled so that it is positioned at a level below the first and second determined levels.
    • 在包含基底,顶部,中心部分,上部和下部的立式反应器中,通过使用沉淀剂从含铀溶液中沉淀制备固体颗粒形式的铀浓缩物的方法, 铀浓缩物的固体颗粒在上升液流的作用下形成流化床,其从基体朝向反应器的顶部循环,依次通过反应器的下部,中心部分和上部,并且其中 是通过在反应器的底部引入液体循环电流(流动)而产生的,所述液体循环电流在反应器上部的第一确定水平(A)上被敲击,并在不沉降到反应器的底部 过多的液体也通过位于反应器上部的第二确定水平(B)的溢流抽真空; 控制固体颗粒的流化床的上限(C)使其位于低于第一和第二确定水平的水平的方法。
    • 8. 发明授权
    • Boron carbide ceramic fibers
    • 碳化硼陶瓷纤维
    • US08536080B2
    • 2013-09-17
    • US12486832
    • 2009-06-18
    • Farhad MohammadiRichard B. Cass
    • Farhad MohammadiRichard B. Cass
    • C04B35/52D01C5/00G21C21/00D01F6/18D01F9/12C01G56/00C01G43/00C01B31/36C01B31/34C01B31/04
    • D01F2/08C04B35/563C04B35/62277C04B35/62281C04B35/6267C04B35/62675C04B35/6365C04B35/6455C04B2235/3206C04B2235/3217C04B2235/3409C04B2235/3813C04B2235/3821C04B2235/3826C04B2235/401C04B2235/421C04B2235/422C04B2235/5256C04B2235/5264C04B2235/5445C04B2235/652C04B2235/668C04B2235/72C04B2235/77C04B2235/80
    • A metal carbide ceramic fiber having improved mechanical properties and characteristics and improved processes and chemical routes for manufacturing metal carbide ceramic fiber. Metal carbide ceramic fibers may be formed via reaction bonding of a metal-based material (e.g. boron) with the inherent carbon of a carrier medium. One embodiment includes a method of making a metal carbide ceramic fiber using VSSP to produce high yield boron carbide fiber. Embodiments of the improved method allow high volume production of high density boron carbide fiber. The chemical routes may include a direct production of boron carbide fiber from boron carbide powder (B4C) and precursor (e.g. rayon fiber) having a carbon component to form a B4C/rayon fiber that may be processed at high temperature to form boron carbide fiber, and that may be subsequently undergo a hot isostatic pressing to improve fiber purity. Another route may include a carbothermal method comprising combining boron powder (B) with a precursor (e.g., rayon fiber) having a carbon component to form a B/rayon fiber, carbonizing and a chemical reaction of boron (B) and carbon (C) to form boron carbide fiber. Another carbothermal method may comprise combining boron oxide powder (B2O3) with a precursor (e.g., rayon fiber) having a carbon component to form a B2O3/rayon fiber, carbonizing and a chemical reaction of boron oxide (B2O3) and carbon (C) to form boron carbide (B4C) fiber.
    • 一种金属碳化物陶瓷纤维,其具有改进的机械性能和特性,以及用于制造金属碳化物陶瓷纤维的改进方法和化学路线。 金属碳化物陶瓷纤维可以通过金属基材料(例如硼)与载体介质的固有碳的反应结合而形成。 一个实施方案包括使用VSSP制备金属碳化物陶瓷纤维以产生高产率碳化硼纤维的方法。 改进方法的实施例允许高容量生产高密度碳化硼纤维。 化学路线可以包括从碳化硼粉末(B4C)直接生产碳化硼纤维和具有碳组分的前体(例如人造纤维),以形成可在高温下加工以形成碳化硼纤维的B4C /人造丝纤维, 然后可以进行热等静压,以提高纤维纯度。 另一种途径可以包括碳热法,其包括将硼粉末(B)与具有碳组分的前体(例如人造丝纤维)组合以形成B /人造丝纤维,碳化和硼(B)和碳(C)的化学反应, 以形成碳化硼纤维。 另一种碳热法可以包括将氧化硼粉末(B 2 O 3)与具有碳成分的前体(例如人造纤维)组合以形成B 2 O 3 /人造丝纤维,碳化和氧化硼(B 2 O 3)和碳(C)的化学反应与 形成碳化硼(B4C)纤维。