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On 18/08/2012 09:19 AM, Le_Forgeron wrote:
> Le 18/08/2012 10:05, Le_Forgeron nous fit lire :
>> (for gold, the proportion are 2/3 Nitric, 1/3 Chloridric; it goes to 7/9
>> and 2/9 for platinum, IIRC)
>
> Nah, it's the opposite proportion! More Chlore, less Nitro!
Interesting. I thought aqua regia was sulfuric and nitric... oh well!
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On 18/08/2012 09:05 AM, Le_Forgeron wrote:
> Red alert. Mixing Nitric acid with Sulphuric acid is a cocktail to make
> nitroglycerin from glycerine. The smallest part of grease might turn
> dangerous once dried.
How about all the metal irons now floating around? Will that affect
anything?
>> So we stand at look at it for a moment. And then my college decides to
>> add a little hydrochloric acid.
>
> Great, now the cocktail is a mix of Sulphuric acid and Aqua regia, the
> solvent for gold& platinum.
Well, yeah, we /are/ trying to dissolve metal...
> All the water generated by Aqua regia attacking the metal will get
> captured by the Sulphuric acid.
>
> Notice that Aqua regia is unstable: it will generate chlorine gaz and
> nitric oxyd (Cl2 and NO) with water.
Apparently it also evolves NOCl, which might explain the dark brown fumes.
> Adding water to Sulphuric acid is exothermic. (it generates heat)
Yeah, I gathered at least one of them is. Good thing we didn't add any
water, eh? (Might explain the fizzing though... it certainly didn't seem
to remove any metal!)
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On 17/08/2012 03:25 PM, Invisible wrote:
> It will be interesting to see if there's anything left by Monday. My
> college thinks it will have been reduced to sludge by then. I suspect
> it'll still be in once piece, just slightly corroded around the outside.
Well, the results are in:
The drive is now somewhat corroded, and most of the paint is missing.
The circuit board probably won't work again. But other than that, the
drive is more or less completely unharmed. Apparently soaking it in a
vat of acid for 4 days is /not/ sufficient to dissolve the entire thing
down to the platters. :-P
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Le 21/08/2012 11:02, Invisible a écrit :
> On 17/08/2012 03:25 PM, Invisible wrote:
>> It will be interesting to see if there's anything left by Monday. My
>> college thinks it will have been reduced to sludge by then. I suspect
>> it'll still be in once piece, just slightly corroded around the outside.
>
> Well, the results are in:
>
> The drive is now somewhat corroded, and most of the paint is missing.
> The circuit board probably won't work again. But other than that, the
> drive is more or less completely unharmed. Apparently soaking it in a
> vat of acid for 4 days is /not/ sufficient to dissolve the entire thing
> down to the platters. :-P
I told you: boiling hydrochloric acid. No fancy mix, just plain Hcl,
enough HCl.
Now, rinse it, dry it and to the boiler...
Or if you have some liquid nitrogen and a hammer... it can be fun too.
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>> Well, the results are in:
>>
>> The drive is now somewhat corroded, and most of the paint is missing.
>> The circuit board probably won't work again. But other than that, the
>> drive is more or less completely unharmed. Apparently soaking it in a
>> vat of acid for 4 days is /not/ sufficient to dissolve the entire thing
>> down to the platters. :-P
>
> I told you: boiling hydrochloric acid. No fancy mix, just plain Hcl,
> enough HCl.
>
> Now, rinse it, dry it and to the boiler...
I don't have any way of heating the acid. Also, we have now run out of acid.
> Or if you have some liquid nitrogen and a hammer... it can be fun too.
We have a 2 tonne liquid nitrogen tank. However, the nitrogen can only
be withdrawn in gaseous form.
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Le 21/08/2012 13:47, Invisible a écrit :
> I don't have any way of heating the acid. Also, we have now run out of
> acid.
>
>> Or if you have some liquid nitrogen and a hammer... it can be fun too.
>
> We have a 2 tonne liquid nitrogen tank. However, the nitrogen can only
> be withdrawn in gaseous form.
"Another one bit the dust", by Queen... time to check if a fall from any
height on a concrete surface would have exploded the drive. We want photo.
"It's a hard life" : after having been the cherished drive on which
everyone relied, it is now persecuted.
"Hammer to fall": at least, do you have some hammer ?
If all else fail, you might get some expanding-foam (in can, urethane)
injected inside the drive: this would preclude any easy restoration.
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On 21/08/2012 01:23 PM, Le_Forgeron wrote:
> "Another one bit the dust", by Queen...
Yeah, that's what I was thinking.
> time to check if a fall from any
> height on a concrete surface would have exploded the drive. We want photo.
A solid lump of steel? Yeah, as if any gravitational impact will touch it.
> "It's a hard life" : after having been the cherished drive on which
> everyone relied, it is now persecuted.
Yeah. It's kind of sad, really.
> "Hammer to fall": at least, do you have some hammer ?
http://tinyurl.com/bnvgfmj
> If all else fail, you might get some expanding-foam (in can, urethane)
> injected inside the drive: this would preclude any easy restoration.
Yeah, I still think unscrewing the lid and shattering the platters is
the simplest.
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On Tue, 21 Aug 2012 13:32:58 +0100, Invisible wrote:
> On 21/08/2012 01:23 PM, Le_Forgeron wrote:
>> "Another one bit the dust", by Queen...
>
> Yeah, that's what I was thinking.
>
Surely you mean "Another one BYTES the dust"?
Great story though!
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
Dave Downing, Somerset U.K.
No bytes were harmed in the making of this message.
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On 8/17/2012 9:25 AM, Invisible wrote:
> After a few minutes it eventually stopped fizzing. There's still some
> kind of brown vapour issuing from it though. And the black paint is
> slowly falling off, revealing the dully silver metal beneath.
Nitrogen Dioxide. Nasty stuff. Thank goodness for a fume hood :)
Anything else dissolve?
> It will be interesting to see if there's anything left by Monday. My
> college thinks it will have been reduced to sludge by then. I suspect
> it'll still be in once piece, just slightly corroded around the outside.
--
---
~Mike
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On 8/21/2012 6:30 AM, Le_Forgeron wrote:
> I told you: boiling hydrochloric acid. No fancy mix, just plain Hcl,
> enough HCl.
Hot Conc Sodium Hydroxide.
--
---
~Mike
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