JPS6374917A - Reutilization of hydrogen in uranium hexafluoride production process - Google Patents
Reutilization of hydrogen in uranium hexafluoride production processInfo
- Publication number
- JPS6374917A JPS6374917A JP61218044A JP21804486A JPS6374917A JP S6374917 A JPS6374917 A JP S6374917A JP 61218044 A JP61218044 A JP 61218044A JP 21804486 A JP21804486 A JP 21804486A JP S6374917 A JPS6374917 A JP S6374917A
- Authority
- JP
- Japan
- Prior art keywords
- hydrogen
- reduction
- reduction process
- recovered
- uranium hexafluoride
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000001257 hydrogen Substances 0.000 title claims abstract description 76
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 76
- SANRKQGLYCLAFE-UHFFFAOYSA-H uranium hexafluoride Chemical compound F[U](F)(F)(F)(F)F SANRKQGLYCLAFE-UHFFFAOYSA-H 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000011946 reduction process Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 28
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 27
- 239000000956 alloy Substances 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 8
- 239000011737 fluorine Substances 0.000 claims abstract description 8
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 7
- 238000003860 storage Methods 0.000 claims description 28
- 238000003682 fluorination reaction Methods 0.000 claims description 8
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims 1
- 239000007789 gas Substances 0.000 abstract description 13
- 150000002431 hydrogen Chemical class 0.000 abstract description 8
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract description 7
- 238000004064 recycling Methods 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 229910014459 Ca-Ni Inorganic materials 0.000 description 3
- 229910014473 Ca—Ni Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004334 fluoridation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、六フッ化ウラン製造方法における水素ガス
の回収及び再利用の方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for recovering and reusing hydrogen gas in a method for producing uranium hexafluoride.
［従来の技術］
ＵＯ５から原子炉板純度のＵ Ｆ ｓを製造する従来゛
の六フッ化ウラン製造工程は第２図におけるフローチャ
ートに示すように、下記の各工程からなる。[Prior Art] The conventional uranium hexafluoride production process for producing U Fs of reactor plate purity from UO5 consists of the following steps, as shown in the flowchart in FIG.
（１）還元工程
粉砕、分級したウラン粉末に前処理を施した後、ＵＯ３
を還元塔内で水素（Ｆ２）ガスと反応させてＵＯｌをＵ
Ｏ２に還元する。このときのＦ２ガスはアンモニアガス
を分解し還元塔内に導入するが、反応効率の向上のため
には過剰のＦ２ガスを必要とする。従って、かなり多量
の過剰分の未反応Ｆ２ガスは還元塔から出たのち安全の
ためバックアップフィルターを介してＦ２バーナーで燃
焼させて大気へ廃棄される。(1) Reduction process After pretreatment of the crushed and classified uranium powder, UO3
is reacted with hydrogen (F2) gas in a reduction tower to convert UOl to U
Reduces to O2. At this time, F2 gas decomposes ammonia gas and is introduced into the reduction tower, but an excess of F2 gas is required to improve reaction efficiency. Therefore, after a considerable amount of excess unreacted F2 gas comes out of the reduction tower, it is burned in an F2 burner via a backup filter for safety and disposed of into the atmosphere.
（２）ＨＦフッ化工程
還元工程で生成したＵ Ｏ２と外部供給源からのＨＦと
を、ＨＦフッ化塔内で反応させてｔＪ Ｏ２はｔＪ Ｆ
４に変換される。このときもＨＦフッ化塔内から出て
来る未反応ＨＦガスはＨＦ除去プロセス（ＨＦコンデン
サー→ＨＦ吸収塔→アルカリスクラバー）を経て環境基
準で定められた濃度まで低下させたのち、大気へ廃棄さ
れる。(2) HF fluorination process The U O2 produced in the reduction step and HF from an external source are reacted in the HF fluorination tower, and tJ O2 is reduced to tJ F
Converted to 4. At this time as well, the unreacted HF gas coming out of the HF fluoridation tower goes through the HF removal process (HF condenser → HF absorption tower → alkaline scrubber), reduces the concentration to the level specified by environmental standards, and is then disposed of into the atmosphere. Ru.
（３）転換工程
ＨＦフッ化工程で得られたＵＦｊをＦ、と反応させてＵ
Ｆ６に転換する工程である。このときのＦ２は（２）の
ＨＦフッ化工程で使用したＨＦ供給源からのＨＦの一部
を電解生成したものを用いる。この転換工程のフッ化種
から排出する未反応Ｆ２はＦ、除去プロセスく活性アル
ミナトラップ−アルカリスクラバー）により低濃度にし
た後大気中へ廃棄される。(3) Conversion step UFj obtained in the HF fluorination step is reacted with F to convert U
This is the process of converting to F6. At this time, F2 is produced by electrolytically generating a part of HF from the HF source used in the HF fluorination step (2). The unreacted F2 discharged from the fluorinated species in this conversion process is reduced to a low concentration by an F removal process (activated alumina trap - alkaline scrubber) and then disposed of into the atmosphere.
［発明が解決しようとする問題点］
前記転換工程で用いられるＦ、はＨＦの電解によって得
られているが、その際に副生される水素は従来大気中に
廃棄されていた。また、前記還元工程からの未反応水素
ガスが燃焼され無駄に廃棄されているなどの問題点があ
った。 この発明はかかる問題点を解決することを目的
とする。[Problems to be Solved by the Invention] The F used in the conversion step is obtained by electrolysis of HF, but the hydrogen produced as a by-product at that time has conventionally been discarded into the atmosphere. Further, there were other problems such as unreacted hydrogen gas from the reduction step being burned and wasted. This invention aims to solve such problems.
［問題点を解決するための手段］
この発明は水素貯蔵合金がＨＦを含む混合水素ガスから
選択的に水素を吸蔵・放出できるとの知見に基づくもの
である。すなわち、この発明は・Ｌ１０３と水素ガスと
を反応させてＵＯ３をＵＯ２に還元する還元工程と、還
元工程で得られたＵ ０２とＨＦとを反応させてＵＯ２
をＬＩＦ、にするＨＦフッ化工程と、ＨＦフッ化工程で
得られたＵ Ｆ ４をＦ。[Means for Solving the Problems] The present invention is based on the finding that a hydrogen storage alloy can selectively absorb and release hydrogen from a hydrogen gas mixture containing HF. That is, this invention includes a reduction step in which L103 and hydrogen gas are reacted to reduce UO3 to UO2, and U02 obtained in the reduction step is reacted with HF to produce UO2.
HF fluorination process to convert UF4 into LIF, and UF4 obtained in the HF fluorination process to F.
と反応させてＬＩＦ、をＬＩＦ、に転換する転換工程と
からなる六フッ化ウラン製造方法において、ＨＦの電解
により水素及びフッ素を生成させ、生成した水素に同伴
するＨＦをＨＦ除去プロセスにより除去し、この水素ガ
スを水素貯蔵合金により水素を選択的に吸蔵回収して還
元工程に導入してＵ ＯｓをＵＯ□に還元し、還元工程
の未反応の水素を水素貯蔵合金により回収して還元工程
にリサイクルさせることを特徴とする六フッ化ウラン製
造プロセスにおける水素再利用の方法に係る。In the method for producing uranium hexafluoride, which consists of a conversion step of converting LIF into LIF by reacting with LIF, hydrogen and fluorine are generated by electrolysis of HF, and HF accompanying the generated hydrogen is removed by an HF removal process. This hydrogen gas is selectively occluded and recovered using a hydrogen storage alloy and introduced into a reduction process to reduce UOs to UO□, and unreacted hydrogen in the reduction process is recovered using a hydrogen storage alloy to complete the reduction process. The present invention relates to a method for reusing hydrogen in a uranium hexafluoride production process, which is characterized by recycling hydrogen into uranium hexafluoride.
［作 用］
この発明によれば、ＨＦの電解によりフッ素を発生させ
てこれをｔＪ Ｆ ａ転換工程に使用し、且つ同時に生
成する水素を還元工程で使用して、従来技術で使用して
いたアンモニア変成装置の設置を不要とし、且つ還元工
程での未反応水素を水素貯蔵合金の使用によってＨ２バ
ーナによる焼却設備を不要とすることにより還元工程を
を簡略化し、且つ安全性を向上させ、また、還元工程へ
の水素の供給源として水素貯蔵合金を使用して供給水素
量の調節を行い、更に還元工程での未反応水素を再び水
素貯蔵合金により吸蔵して還元工程にリサイクルするこ
とにより未反応水素の有効利用を図ることができる。[Function] According to the present invention, fluorine is generated by electrolysis of HF and used in the tJFa conversion process, and simultaneously generated hydrogen is used in the reduction process, which was used in the conventional technology. It simplifies the reduction process and improves safety by eliminating the need to install an ammonia converter, and by using a hydrogen storage alloy to store unreacted hydrogen in the reduction process, eliminating the need for incineration equipment using an H2 burner. A hydrogen storage alloy is used as a hydrogen supply source to the reduction process to adjust the amount of hydrogen supplied, and unreacted hydrogen in the reduction process is stored again by the hydrogen storage alloy and recycled to the reduction process. Reaction hydrogen can be used effectively.
（実施例］
以下に図を参照してこの発明の実施例をさらに詳細に説
明する。第１図によれば、まず、ＨＦの電解により還元
工程に使用する水素と、ＵＦ、のＵＦｓへの転換工程に
使用するフッ素とを生成する。(Example) Examples of the present invention will be explained in more detail below with reference to the figures.According to Figure 1, first, hydrogen and UF used in the reduction process are converted into UFs by electrolysis of HF. fluorine used in the conversion process.
生成した水素には一部ＨＦを含有しているので、ＨＦ除
去プロセスによＨＦを除去し、更にこの水素ガスを水素
貯蔵合金を内臓する水素吸蔵プロセスを通すことにより
水素を選択的に吸蔵し、この吸蔵した水素を還元工程へ
供給する。この水素吸蔵プロセスは少なくとも２個の水
素貯蔵合金を内蔵し、その一方が水素を吸蔵し他方は水
素を放出するように構成される。水素を製造するＨＦ電
解槽は、同時に生成するフッ素ガスの転換工程でのフッ
素所要量に合わせて稼動されなければならない、転換工
程が稼動していて還元工程が稼動していないときは還元
工程前段に設置された水素吸貯蔵プロセスにより水素の
貯蔵のみが行なわれる。Since the generated hydrogen contains some HF, the HF is removed by an HF removal process, and this hydrogen gas is then passed through a hydrogen storage process that incorporates a hydrogen storage alloy to selectively store hydrogen. , this occluded hydrogen is supplied to the reduction process. This hydrogen storage process incorporates at least two hydrogen storage alloys, one of which is configured to store hydrogen and the other to release hydrogen. The HF electrolyzer that produces hydrogen must be operated in accordance with the amount of fluorine required in the conversion process of the fluorine gas that is produced at the same time.When the conversion process is in operation and the reduction process is not, Only the storage of hydrogen will be carried out by the hydrogen absorption and storage process installed at.
また還元工程が稼動しているのにＨＦ電解槽がフッ素ガ
スの消費情況やその他の要因により停止しているときに
は水素ガスを供給するため前段の水素吸蔵プロセスに吸
蔵されている水素を還元工程に供給する。従って、前段
水素吸蔵プロセスの設置により還元工程は影響されずに
単独で運転される。In addition, if the HF electrolyzer is stopped due to fluorine gas consumption or other factors while the reduction process is in operation, the hydrogen stored in the previous hydrogen storage process is transferred to the reduction process in order to supply hydrogen gas. supply Therefore, by installing the first stage hydrogen storage process, the reduction process is operated independently without being affected.
還元工程の還元効率を高めるためには還元工程へ過剰の
水素量を供給することが必要である。この水素量の調節
は前段水素吸蔵プロセスにより行なわれるが、還元工程
から排出される過剰の未反応水素は還元工程後段に水素
吸蔵プロセスを設！して回収し、還元工程にリサイクル
することによって再利用し、水素分離後の不純物ガス、
例えば湿気等はフードから廃棄される。In order to increase the reduction efficiency of the reduction process, it is necessary to supply an excess amount of hydrogen to the reduction process. This amount of hydrogen is adjusted by a hydrogen storage process in the first stage, but a hydrogen storage process is installed in the latter stage of the reduction process to remove excess unreacted hydrogen discharged from the reduction process. The impurity gas after hydrogen separation is recovered and reused by recycling it in the reduction process.
For example, moisture is disposed of through the hood.
上記前段および後段の水素吸蔵プロセスに内臓される水
素貯蔵合金としては既知のＣａ−Ｎｉ系合金を使用した
が、その性能は下記の通りであった。A known Ca-Ni alloy was used as the hydrogen storage alloy incorporated in the hydrogen storage process in the first and second stages, and its performance was as follows.
すなわち、種々の濃度でＨＦを含む混合水素ガスの吸蔵
、放出試験を行なった。混合したＨＦ濃度は１１０００
ｐｐから１０（体積）％までとした。第３図にＨＦを含
む混合水素ガスの７２℃におけるＰＣＴ曲線（圧力−組
成一温度曲線）を示す、試験の結果、この合金は常温、
常圧で多量の水素を容易に吸蔵、放出し、ＨＦを最高１
０％含む混合水素ガスでも水素を優先的に吸蔵した。こ
の場合、ＨＦ濃度の高いものほど合金の水素貯蔵量は低
下するが、１０％ＨＦのときでも合金１ｇ当たりに約１
００ｃｃの水素を吸蔵している。 ”また、第４図に示
すように、ＨＦを含む混合水素ガスによる吸蔵、放出の
繰り返し回数と放出水素量との関係を求めた。吸蔵は２
１℃において平衡水素圧１０気圧まで行ない、放出は６
０℃において平衡水素圧１気圧まで行なった。水素ガス
中−のＨＦ濃度が高くなるにつれて、混合ガスの吸蔵、
放出の繰り返し特性すなわち合金の耐久性は低下する。That is, storage and release tests of mixed hydrogen gas containing HF at various concentrations were conducted. The mixed HF concentration is 11000
pp to 10 (volume)%. Figure 3 shows the PCT curve (pressure-composition-temperature curve) of mixed hydrogen gas containing HF at 72°C. As a result of the test, this alloy was
Easily absorbs and releases large amounts of hydrogen at normal pressure, and stores up to 1 HF of hydrogen.
Even in a mixed gas containing 0% hydrogen, hydrogen was preferentially occluded. In this case, the higher the HF concentration, the lower the hydrogen storage capacity of the alloy, but even at 10% HF, approximately 1
It stores 00cc of hydrogen. ``Also, as shown in Figure 4, we determined the relationship between the number of repetitions of occlusion and desorption by mixed hydrogen gas containing HF and the amount of hydrogen released.
The process was carried out at 1°C up to an equilibrium hydrogen pressure of 10 atm, and the release was 6
The reaction was carried out at 0°C up to an equilibrium hydrogen pressure of 1 atm. As the HF concentration in hydrogen gas increases, the absorption of mixed gas,
The cyclic nature of the release, ie the durability of the alloy, is reduced.
１０００ｐｐ鋤ＨＦの場合は５００回繰り返した後の吸
蔵量は初期の６３％であり、工業的にも充分利用できる
が、合金の耐久性の面からは極力ＨＦ濃度を下げるのが
望ましい、５００回の耐久性は、システムの経済性、メ
ンテナンス等を考慮した目標回数である。In the case of 1000pp plow HF, the storage capacity after 500 repetitions is 63% of the initial value, which is sufficient for industrial use, but from the viewpoint of the durability of the alloy, it is desirable to reduce the HF concentration as much as possible, after 500 repetitions. The durability of is a target number of times considering the economic efficiency of the system, maintenance, etc.
なお、前記実施例では、水素貯蔵合金にＣａ−Ｎｉ系合
金を使用したが、Ｃａ−Ｎｉ系合金以外の水素貯蔵合金
を使用しても、混合ガスからＨ２を選択的に吸蔵する合
金であれば前記と同様な効果を奏する。In the above example, a Ca-Ni alloy was used as the hydrogen storage alloy, but any hydrogen storage alloy other than the Ca-Ni alloy may be used, even if it is an alloy that selectively absorbs H2 from the mixed gas. The same effect as described above can be obtained.
［発明の効果］
以上のように、この発明によれば、水素貯蔵合金を使用
することによって、六フッ化ウラン製造プロセスにおけ
る副生水素の有効利用が可能となり、還元工程が簡略化
し、排気ガス処理などの設備の省力化が可能となり安全
性が向上し、且つ還元工程で生ずる水素の再利用を図る
ことが可能となった。[Effects of the Invention] As described above, according to the present invention, by using a hydrogen storage alloy, it becomes possible to effectively utilize by-product hydrogen in the uranium hexafluoride production process, simplify the reduction process, and reduce exhaust gas. It has become possible to save labor in treatment equipment, improve safety, and reuse hydrogen generated in the reduction process.
【図面の簡単な説明】
第１図はこの発明の一実施態様による六フッ化ウラン製
造工程のフローチャート、第２図は従来法による六フッ
化ウラン製造工程のフローチャート、第３図はＣａ−Ｎ
ｉ系水素貯蔵合金によるＨＦを含む混合水素ガスの７２
℃におけるＰＣＴ曲線、第４図はＣａ−Ｎｉ系水素貯蔵
合金によるＨＦを含む混合水素ガスによる吸蔵、放出の
繰り返し回数と放出水素量との関係を示す図である。[Brief Description of the Drawings] Fig. 1 is a flowchart of the uranium hexafluoride production process according to an embodiment of the present invention, Fig. 2 is a flowchart of the uranium hexafluoride production process according to the conventional method, and Fig. 3 is a Ca-N
72 of mixed hydrogen gas containing HF by i-based hydrogen storage alloy
FIG. 4 is a diagram showing the relationship between the number of repetitions of occlusion and desorption of mixed hydrogen gas containing HF by a Ca--Ni hydrogen storage alloy and the amount of released hydrogen.
Claims (1)
に還元する還元工程と、 還元工程で得られたＵＯ＿２とＨＦとを反応させてＵＯ
＿２をＵＦ＿４にするＨＦフッ化工程と、ＨＦフッ化工
程で得られたＵＦ＿４をＦ＿２と反応させてＵＦ＿４を
ＵＦ＿６に転換する転換工程とからなる六フッ化ウラン
製造方法において、 ＨＦの電解により水素及びフッ素を生成させ、生成した
水素に同伴するＨＦをＨＦ除去プロセスにより除去し、
この水素ガスを水素貯蔵合金により選択的に吸蔵回収し
て還元工程に導入してＵＯ＿３をＵＯ＿２に還元し、 還元工程の未反応の水素を水素貯蔵合金により回収して
還元工程にリサイクルさせることを特徴とする、六フッ
化ウラン製造プロセスにおける水素再利用の方法。[Claims] By reacting UO_3 with hydrogen gas, UO_3 is converted to UO_2.
A reduction step in which UO_2 obtained in the reduction step is reacted with HF to form UO
In a method for producing uranium hexafluoride, which consists of an HF fluorination step to convert _2 into UF_4, and a conversion step in which UF_4 obtained in the HF fluorination step is reacted with F_2 to convert UF_4 to UF_6, hydrogen is produced by electrolysis of HF. and fluorine is generated, and HF accompanying the generated hydrogen is removed by an HF removal process,
This hydrogen gas is selectively absorbed and recovered by a hydrogen storage alloy and introduced into the reduction process to reduce UO_3 to UO_2, and unreacted hydrogen in the reduction process is recovered by the hydrogen storage alloy and recycled to the reduction process. A method of reusing hydrogen in the uranium hexafluoride manufacturing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61218044A JPS6374917A (en) | 1986-09-18 | 1986-09-18 | Reutilization of hydrogen in uranium hexafluoride production process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61218044A JPS6374917A (en) | 1986-09-18 | 1986-09-18 | Reutilization of hydrogen in uranium hexafluoride production process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6374917A true JPS6374917A (en) | 1988-04-05 |
| JPH0253373B2 JPH0253373B2 (en) | 1990-11-16 |
Family
ID=16713767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61218044A Granted JPS6374917A (en) | 1986-09-18 | 1986-09-18 | Reutilization of hydrogen in uranium hexafluoride production process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6374917A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5505927A (en) * | 1992-12-04 | 1996-04-09 | Atomic Energy Corporation Of South Africa Limited | Production of uranium hexafluoride |
-
1986
- 1986-09-18 JP JP61218044A patent/JPS6374917A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5505927A (en) * | 1992-12-04 | 1996-04-09 | Atomic Energy Corporation Of South Africa Limited | Production of uranium hexafluoride |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0253373B2 (en) | 1990-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |