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PostPosted: Nov 14, 2010 7:23 am 
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What happens to the corrosion product fluorides (Ni, Fe, Cr, Mo fluorides) when they are put through fluorinators and vacuum stills? They are not particularly volatile in terms of fluorination - one would not expect the stuff to get any valence upgrades, right? But what about the vacuum distillation unit? If it stays in the still bottoms we might avoid corrosion product cleanup systems, but if it goes up with the product feed then additional cleanup will be required. What system will be required to clean this stuff up? Electrolysis might be good here - perhaps the corrosion product cleanup system can be integrated with the noble metal fission product trap?


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PostPosted: Nov 14, 2010 3:33 pm 
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Cyril R wrote:
What happens to the corrosion product fluorides (Ni, Fe, Cr, Mo fluorides) when they are put through fluorinators and vacuum stills? They are not particularly volatile in terms of fluorination - one would not expect the stuff to get any valence upgrades, right? But what about the vacuum distillation unit? If it stays in the still bottoms we might avoid corrosion product cleanup systems, but if it goes up with the product feed then additional cleanup will be required. What system will be required to clean this stuff up? Electrolysis might be good here - perhaps the corrosion product cleanup system can be integrated with the noble metal fission product trap?


Molybdenum does have a highly volatile hexafluoride.


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PostPosted: Nov 14, 2010 4:36 pm 
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Owen T wrote:
Cyril R wrote:
What happens to the corrosion product fluorides (Ni, Fe, Cr, Mo fluorides) when they are put through fluorinators and vacuum stills? They are not particularly volatile in terms of fluorination - one would not expect the stuff to get any valence upgrades, right? But what about the vacuum distillation unit? If it stays in the still bottoms we might avoid corrosion product cleanup systems, but if it goes up with the product feed then additional cleanup will be required. What system will be required to clean this stuff up? Electrolysis might be good here - perhaps the corrosion product cleanup system can be integrated with the noble metal fission product trap?


Molybdenum does have a highly volatile hexafluoride.


Yes I know, though it is quite noble and one would not expect much to leach out of structural members when salt redox is kept in check. But it is also a major fission product. It might come out with the offgas if one fluorinates. If one does not fluorinate online (DMSR or vacuum still only) it would be interesting to know what happens to the stuff. I think the corrosion product fluorides are more volatile than LiF in which case they will come out of the still. The noble metal trap might be a good place to grab them. You can certainly grab Mo and Ni this way, not so sure about Cr. Its more noble than the actinides fluorides. Maybe adding metallic thorium or other actinides here would be good enough to throw the gunk out of solution.


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