Single-step process for preparation of uranium dioxide from uranium hexafluoride
UF6 is converted to UO2 by reacting it with a stoichiometric excess of a gaseous mixture of hydrogen and either oxygen or water vapour at a temperature > 1100 DEG C. and a pressure \sO 20 torr. To produce sinterable powder, the hydrogen is preferably in at least 4 times, e.g. 15-20 times the stoi...
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creator | HEESTAND RICHARD L JR. CARL F. LEITTEN |
description | UF6 is converted to UO2 by reacting it with a stoichiometric excess of a gaseous mixture of hydrogen and either oxygen or water vapour at a temperature > 1100 DEG C. and a pressure \sO 20 torr. To produce sinterable powder, the hydrogen is preferably in at least 4 times, e.g. 15-20 times the stoichiometric proportion, and the O2 or water vapour in at least 1.5 times, e.g. 8-10 times, the gases being premixed at 800-1000 DEG C., e.g. 900-1000 DEG C. at a pressure < 20 torr. whereby solid particles, probably UO2F2, are formed, and reacting at \sP 1100 DEG C., pref. 1200-1500 DEG C. at a pressure of < 20 torr. A solid deposit is produced when the H2 is in at least 5 times, and the O2 or water vapour in at least 1.5 times the stoichiometric amounts at \sP 1100 DEG C., e.g. 1200-1500 DEG C., and < 10 torr., the UO2 being deposited on a refractory surface e.g. alumina. For a smooth-surfaced body, the H2 is in 5-20 times, and the O2 or water vapour is in 1.5-10 times the stoichiometric amounts, and for a tubular body, the former used is the inner surface of a refractory tube. Crystalline UO2 is produced if the H2 is in 30-90 times, and the O2 or water vapour is in 10-90 times the stoichiometric amount. The product has a low fluorine content and may be used, in tubular form, as a nuclear fuel element. missing page 174 |
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LEITTEN</creatorcontrib><description>UF6 is converted to UO2 by reacting it with a stoichiometric excess of a gaseous mixture of hydrogen and either oxygen or water vapour at a temperature > 1100 DEG C. and a pressure \sO 20 torr. To produce sinterable powder, the hydrogen is preferably in at least 4 times, e.g. 15-20 times the stoichiometric proportion, and the O2 or water vapour in at least 1.5 times, e.g. 8-10 times, the gases being premixed at 800-1000 DEG C., e.g. 900-1000 DEG C. at a pressure < 20 torr. whereby solid particles, probably UO2F2, are formed, and reacting at \sP 1100 DEG C., pref. 1200-1500 DEG C. at a pressure of < 20 torr. A solid deposit is produced when the H2 is in at least 5 times, and the O2 or water vapour in at least 1.5 times the stoichiometric amounts at \sP 1100 DEG C., e.g. 1200-1500 DEG C., and < 10 torr., the UO2 being deposited on a refractory surface e.g. alumina. For a smooth-surfaced body, the H2 is in 5-20 times, and the O2 or water vapour is in 1.5-10 times the stoichiometric amounts, and for a tubular body, the former used is the inner surface of a refractory tube. Crystalline UO2 is produced if the H2 is in 30-90 times, and the O2 or water vapour is in 10-90 times the stoichiometric amount. The product has a low fluorine content and may be used, in tubular form, as a nuclear fuel element. missing page 174</description><language>eng</language><subject>CHEMISTRY ; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F ; INORGANIC CHEMISTRY ; METALLURGY</subject><creationdate>1966</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19660712&DB=EPODOC&CC=US&NR=3260575A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19660712&DB=EPODOC&CC=US&NR=3260575A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>HEESTAND RICHARD L</creatorcontrib><creatorcontrib>JR. CARL F. LEITTEN</creatorcontrib><title>Single-step process for preparation of uranium dioxide from uranium hexafluoride</title><description>UF6 is converted to UO2 by reacting it with a stoichiometric excess of a gaseous mixture of hydrogen and either oxygen or water vapour at a temperature > 1100 DEG C. and a pressure \sO 20 torr. To produce sinterable powder, the hydrogen is preferably in at least 4 times, e.g. 15-20 times the stoichiometric proportion, and the O2 or water vapour in at least 1.5 times, e.g. 8-10 times, the gases being premixed at 800-1000 DEG C., e.g. 900-1000 DEG C. at a pressure < 20 torr. whereby solid particles, probably UO2F2, are formed, and reacting at \sP 1100 DEG C., pref. 1200-1500 DEG C. at a pressure of < 20 torr. A solid deposit is produced when the H2 is in at least 5 times, and the O2 or water vapour in at least 1.5 times the stoichiometric amounts at \sP 1100 DEG C., e.g. 1200-1500 DEG C., and < 10 torr., the UO2 being deposited on a refractory surface e.g. alumina. For a smooth-surfaced body, the H2 is in 5-20 times, and the O2 or water vapour is in 1.5-10 times the stoichiometric amounts, and for a tubular body, the former used is the inner surface of a refractory tube. Crystalline UO2 is produced if the H2 is in 30-90 times, and the O2 or water vapour is in 10-90 times the stoichiometric amount. The product has a low fluorine content and may be used, in tubular form, as a nuclear fuel element. missing page 174</description><subject>CHEMISTRY</subject><subject>COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F</subject><subject>INORGANIC CHEMISTRY</subject><subject>METALLURGY</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1966</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZAgIzsxLz0nVLS5JLVAoKMpPTi0uVkjLLwKyUwsSixJLMvPzFPLTFEqLEvMyS3MVUjLzKzJTUhXSivJz4YIZqRWJaTml-UVAGR4G1rTEnOJUXijNzSDv5hri7KGbWpAfn1pckJicmpdaEh8abGxkZmBqbupoTFgFABPCN2A</recordid><startdate>19660712</startdate><enddate>19660712</enddate><creator>HEESTAND RICHARD L</creator><creator>JR. CARL F. LEITTEN</creator><scope>EVB</scope></search><sort><creationdate>19660712</creationdate><title>Single-step process for preparation of uranium dioxide from uranium hexafluoride</title><author>HEESTAND RICHARD L ; JR. CARL F. LEITTEN</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US3260575A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1966</creationdate><topic>CHEMISTRY</topic><topic>COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F</topic><topic>INORGANIC CHEMISTRY</topic><topic>METALLURGY</topic><toplevel>online_resources</toplevel><creatorcontrib>HEESTAND RICHARD L</creatorcontrib><creatorcontrib>JR. CARL F. LEITTEN</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>HEESTAND RICHARD L</au><au>JR. CARL F. LEITTEN</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Single-step process for preparation of uranium dioxide from uranium hexafluoride</title><date>1966-07-12</date><risdate>1966</risdate><abstract>UF6 is converted to UO2 by reacting it with a stoichiometric excess of a gaseous mixture of hydrogen and either oxygen or water vapour at a temperature > 1100 DEG C. and a pressure \sO 20 torr. To produce sinterable powder, the hydrogen is preferably in at least 4 times, e.g. 15-20 times the stoichiometric proportion, and the O2 or water vapour in at least 1.5 times, e.g. 8-10 times, the gases being premixed at 800-1000 DEG C., e.g. 900-1000 DEG C. at a pressure < 20 torr. whereby solid particles, probably UO2F2, are formed, and reacting at \sP 1100 DEG C., pref. 1200-1500 DEG C. at a pressure of < 20 torr. A solid deposit is produced when the H2 is in at least 5 times, and the O2 or water vapour in at least 1.5 times the stoichiometric amounts at \sP 1100 DEG C., e.g. 1200-1500 DEG C., and < 10 torr., the UO2 being deposited on a refractory surface e.g. alumina. For a smooth-surfaced body, the H2 is in 5-20 times, and the O2 or water vapour is in 1.5-10 times the stoichiometric amounts, and for a tubular body, the former used is the inner surface of a refractory tube. Crystalline UO2 is produced if the H2 is in 30-90 times, and the O2 or water vapour is in 10-90 times the stoichiometric amount. The product has a low fluorine content and may be used, in tubular form, as a nuclear fuel element. missing page 174</abstract><oa>free_for_read</oa></addata></record> |
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title | Single-step process for preparation of uranium dioxide from uranium hexafluoride |
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