MANUFACTURE OF UF$sub 4$

Title: MANUFACTURE OF UF$sub 4$

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Abstract

The manufacture of uranium tetrafluoride from urarium dioxide is described. Uranium dioxide is heated to about 500 deg C in a reactor. Anhydrous hydrogen fluoride is passed through the reactor in contact with uranium dioxide for several hours, the flow of hydrogen fluoride is discontinued, and hydrogen passed through the reactor for less than an hour. The flow of hydrogen fluoride is resumed for several hours, and then nitrogen is passed for a few minutes to expel unreacted hydrogen fluoride as water vapor. The reactor is cooled to room temperature and the uranium tetrafluoride removed.

Inventors:: Calcott, W.S.

Issue Date:: 1959-10-13

Research Org.:: Originating Research Org. not identified

OSTI Identifier:: 4202565

Patent Number(s):: 2908548

Assignee:: U.S. Atomic Energy Commission DTIE; NSA-14-007438

NSA Number:: NSA-14-007438

Resource Type:: Patent

Resource Relation:: Other Information: Orig. Receipt Date: 31-DEC-60

Country of Publication:: United States

Language:: English

Subject:: CHEMISTRY; COOLING; HEATING; HYDROGEN; HYDROGEN FLUORIDES; NITROGEN; PREPARATION; URANIUM DIOXIDE; URANIUM TETRAFLUORIDE; VAPORS; WATER

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                    Calcott, W.S. MANUFACTURE OF UF$sub 4$.  United States: N. p., 1959. 
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                    Calcott, W.S. MANUFACTURE OF UF$sub 4$.  United States.

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                    Calcott, W.S. Tue .  
        "MANUFACTURE OF UF$sub 4$".  United States.

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@article{osti_4202565,

  title        = {MANUFACTURE OF UF$sub 4$},

  author       = {Calcott, W.S.},

  abstractNote = {The manufacture of uranium tetrafluoride from urarium dioxide is described. Uranium dioxide is heated to about 500 deg C in a reactor. Anhydrous hydrogen fluoride is passed through the reactor in contact with uranium dioxide for several hours, the flow of hydrogen fluoride is discontinued, and hydrogen passed through the reactor for less than an hour. The flow of hydrogen fluoride is resumed for several hours, and then nitrogen is passed for a few minutes to expel unreacted hydrogen fluoride as water vapor. The reactor is cooled to room temperature and the uranium tetrafluoride removed.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1959},

  month        = {10}

}

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CONTINUOUS PROCESS FOR THE CONVERSION OF UF$sub 6$ TO UF$sub 4$

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Method and apparatus are presented for rapid and complete conversion of solid, powdered uranium tetrafiuorlde to uranlum hexafluorlde by treating the UF/ sub 4/ with fluorine gas at a temperature of about 800 icient laborato C.
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The Fluorox Process for the conversion of UNH to UF/sub 4/ and UF/sub 6/ , utilizing moving-bed techniques, is outlined. The Process involves the following steps: denitration of UNH to UO/sub 3/; pelleting of UO/sub 3/ with recycled UO/sub 2/F/sub 2/; reduction hydrofluorination to UF/sub 4/; and oxidation of UF/sub 4/ to UF/sub 6/ product and UO/sub 2/F/sub 2/ intermediate. Advantages of the Fluorox Process include substitution of HF for T/sub 2/, reduction in HF requirements, and reduction in plant-size and mechanical complexity. (C.W.H.)
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A description is given of the preparation of uranium tetrafluoride by reacting a hexavalent uranium compound with a pclysaccharide and gaseous hydrogen fluoride at an elevated temperature. Uranium trioxide and starch are combined with water to form a doughy mixture. which is extruded into pellets and dried. The pellets are then contacted with HF at a temperature from 500 to 700 deg C in a moving bed reactor to prcduce UF/sub 4/. Reduction of the hexavalent uranium to UO/sub 2/ and conversion of the UO/sub 2/ to UF/sub 4/ are accomplished simultaneously in this process.
ELECTROLYTIC PREPARATION OF UF$sub 4$

Patent Allen, A.L.; Anderson, R.W.; Powell, E.W.

A method is presented for converting hexavalent aranium to uranium tetrafluoride. The method consists of electrolyzing a solution of uranyl fluoride in hydrofluoric acld at about 90 icient laborato C. The uranyl ions are reduced at the cathode and a hydrated uranium tetrafluoride precipitates. The precipitate is separated and subsequently dehydrated to UF/sub 4/.

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