h a l f b a k e r yInexact change.
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I read somewhere that the oceans contain traces of gold, uranium, silver, etc. Why not extract these valuable minerals for a load of money? The SWME could be a new invention that filters out these minerals.
(?) Microbe Turns Dissolved Gold Solid
http://dailynews.ya...icrobes_gold_2.html
"Extremophiles, so named because they live in extreme conditions such as hot springs and volcanic vents in the ocean, inhale dissolved gold and convert it into solid deposits." [jutta, Jul 15 2001]
(?) history of gold extraction attempts
http://www.gnt-verl...6/rez_bhc2001.shtml
people have been trying for quite a while.... [pfperry, Jul 01 2002, last modified Oct 21 2004]
[link]
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If I remember corectly it costs several times more money (electricity for electrolysis and then having to separate the stuff you get) than the value of the extracted stuff... |
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Thermodynamics doesn't enter into it. You're not trying to generate power by extracting gold from seawater, you're trying to make money. There is no energy==money identity that's relevant here. If the price of gold should rise enough and/or the price of the extraction process fall enough, it will be done. (Compare other marginal mining prospects.) |
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The only important points to make about this idea, of course, are that it's, well, not very new, and, well, not very specific. |
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And this has been halfbaked for years in various SF books... |
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[Monkfish], guess I got carried away there. Somehow, I don't think money, energy, and low entropy are going to be that different in the long term, but hey. |
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When you've extracted the minerals you could use sunlight to split the water into hydrogen and oxygen keeping wierdos like me an Hydrogenman happy. |
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If you split the water into hydrogen and oxygen first, the minerals will be just sitting there in a pile. |
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[PeterSealy]: I realise that; I was merely simplifying things for [st3f]. (Stress the word 'first' in my anno.) |
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angel: Don't worry. I'm trying to ignore him at the moment anyway.... but with those long floppy ears, furry chin and twitchy nose he's just so darn cute. No, hang on a minute, that's a rabbit. Pity you can't fishbone annotations. Oo oo, I think I had an idea (and Peter won't by up for hours). |
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New here but had to chip in. In Sydney, Australia they are going to build desalination plants on the coast because it has not rained properly for 8 years. The same on the west coast in Perth. They reckon the water will cost A$1 per cubic metre to produce. By my reckoning (half baked mental arithmetic) thats worth more than all the minerals put together. Is extracting minerals viable now that you add in the value of the water? |
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If the desalinization produces fresh water at an
acceptable cost, anything made from the resulting
residue (mostly salt) could be sold for a profit. |
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The residue is brine (i.e. mostly water). |
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Evaporate the water from the brine and you are left
with sea salt. |
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Capture the evaporated water, and you have distilled
water. |
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Yes, but the reason they stop at brine is because it's
not economic to remove the remainder of the
water. Whether by reverse osmosis or distillation, it
takes more energy to remove the water as the brine
gets more concentrated. |
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