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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
I am looking out of the window and I see a limitless supply of cold air and I am thinking what can it be used for.
Deuterium oxide has different properties than normal water and my guess is that the layer of ice on top of a container of water contains a different concentration than the water below.
What is the difference and how is it possible to measure such a tiny difference?
Registered Member #69
Joined: Thu Feb 09 2006, 07:42AM
Location:
Posts: 116
It's not that bad, 1L per 3200L water (for HDO). Physical methods for HDO separation include distillation or electrolysis and then distillation (of liquid D/H). I haven't read of freezing being used... The freezing point of D2O is 3.82C but HDO must be closer to 0. I guess you'd end up with the first frozen parts having slightly more D than normal. You'd need some expensive spectroscopy setup to measure the tiny quantities of D accurately.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
Not at the moment, if there is a possibility of any significant concentration by repeating the process a few hundred or a thousand times then I just might make a machine that does it. The energy is mostly free.
Registered Member #65
Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
The problem is the water would likely have to be free of contaminates prior to being processed (Chlorine, Fluorine, Sodium, Copper, and microbes etc.) Also, there may be problems with starting any freezing processes and keeping the liquid from suppressing its own fusion point (that’s heat-of-fusion) when pure.
Here it’s only a few hours drive to one of the largest CANDU heavy water production facilities around. There may be some obvious problems with import/export for private use as most local people are not even aware the place exists. However, they likely use the Girdler Sulphide Process.
Waters density is greatest at about 4’C. I wonder if perhaps some sort of special centrifuge would work (constant fed whirlpool.) =] lol he he he
“Time to split some atoms! Where’s my chisel?â€(?)
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
While it might be possible to concentrate D2O to a reasonable level, even if the air/water is free it is not really cost effective... You can get 99.9% D2O for like $1-2/ml...
Perhaps you would get more bang for the buck (pun intended) going for u-235 (see here)... (not to make fun of your idea, just couldn't resist posting one of my favorite links)
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
I'm not sure but my guess would be that freezing would work and, from the point of view of the efficiency of fractionation, it would be rather good. On the other hand, the physical separation of the ice, drying and re-melting it many times would be very difficult to mechanise- supercooling would make things worsse still. I wonder if anyone has tried "zone refining" water. That might give some degree of fractionation.
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Concentrating deuterium oxide by freezing
(not to make fun of your idea, just couldn't resist posting one of my favorite links)
