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Author Topic: OTC utilization of Hg and Hg2+ waste  (Read 266 times)

reckless

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OTC utilization of Hg and Hg2+ waste
« on: June 12, 2012, 07:36:25 PM »
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« Last Edit: June 07, 2013, 07:24:02 AM by reckless »

Alchemyst

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #1 on: June 12, 2012, 08:37:30 PM »
Quote
some of them form complexes with Hg2+

And what you do with this ?

carl_nnabis

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #2 on: June 12, 2012, 11:28:20 PM »
very responsible! i appreciate the use of elemental sulfur very much cinnabar is at least nontoxic! :)
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zgoat65

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #3 on: June 14, 2012, 01:17:10 AM »
What if someine tried the original "zygoat" (no relation, totally different goat) method from Rhodium for production of HgCl2.  When, after arriving successfully at HgSO4, went to next step (water addition) and got insoluble sludge.  Lets says that the person sealed up the insoluble sludge in a safe container and still had it months later after deciding that Hg2Cl2 was worth the extra time it takes for amalgumation due to safety and  ease of production.  Is there some way to recover the mercury from the aforementioned sludge?  After finding it insoluble in water someone may have went ahead and added some NaOH to see if the rxn progressed, and we're gonna say it didn't.   Just trying to give as much info as possible so that I can get the best answer to my query.
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zgoat65

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #4 on: June 14, 2012, 04:08:57 AM »
Thanks for the tip fresh.  It's just one of those daze.
If you build a man a fire, he'll be warm for a day.
If you set a man on fire, he'll be warm for the rest of his life

Goldmember

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #5 on: June 14, 2012, 04:45:31 AM »
Tsk tsk, You funny mofo. Has the universe inverted? Is black the new white? Are you Fresh, the new off-topic police? LMFAO! :P

This query is very on topic. Salvaging waste mercury for re-use surely falls under the topic heading moreso than the original post see?


Yes there is a way to salvage elemental Hg from that sludge, but the exact method escapes me at this moment in time...

Ill get back to you.

atara

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #6 on: June 14, 2012, 07:40:11 AM »
...just use... nitric acid... jeez... mercury (ii) iodide precipitates from mercury (ii) nitrate and potassium iodide in friggin' water and nitric acid will oxidize all of the mercury.

Goldmember

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #7 on: June 15, 2012, 01:06:01 AM »
Im well mate, thanks for asking. ;) I understand . Just ribbing ya a little.

OFF TOPIC ! :-X

carl_nnabis

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #8 on: June 15, 2012, 01:39:38 AM »
unfortunately, HgSO4 is mercury sulfate and that stuff IS TOXIC  :(
Cinnabar is mercury sulfide HgS that is nontoxic
« Last Edit: June 15, 2012, 01:53:09 AM by carl_nnabis »
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atara

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #9 on: June 15, 2012, 05:28:25 AM »
Indeed mercury sulfate is toxic... so is elemental mercury. People talk about gallium amalgams but I've never seen it done. Gallium-tin, I think, would work better -- tin lowers the melting point significantly (gallium melting point ~29 C, Ga-Sn eutectic ~16 C), and of course galinstan:

http://www.sciencedirect.com/science/article/pii/S0360319908001407

fresh1

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #10 on: June 15, 2012, 08:21:42 AM »
what do dentists use to make their amalgums?  could not something similar be done?   IIRC they dont use heat to make it...maybe sonication?  ???
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carl_nnabis

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #11 on: June 15, 2012, 10:45:19 AM »
mercury sulfate is really toxic for sure you dont want it in you... you cannot compare it to elemental mercury, cinnabar is more in the same range of toxicity to elemental whereas the sulfate is more like the other used salts in toxicity...

indeed fresh you could use the same metal a dentist uses for his amalgam, but i think these times it is mainly silver thats used ;D interesting that in some european countries and in japan too the use of amalgam by dentists is forbidden now...

here it is not and i know of somebody who worked at a dentist, she said they used to have very small extra-hardened bottles with 500 and 1000g quantities elemental mercury in it :o
remember how dense that stuff is ;D
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atara

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #12 on: June 16, 2012, 07:58:58 PM »
Quote from: reckless on June 16, 2012, 02:44:14 PM
Quote from: atara on June 14, 2012, 07:40:11 AM
...just use... nitric acid... jeez... mercury (ii) iodide precipitates from mercury (ii) nitrate and potassium iodide in friggin' water and nitric acid will oxidize all of the mercury.
Bad idea, excess of KI results in K2[HgI4], soluble in water.
2KI+HgI2->K2[HgI4]
Right, potassium is a bad, yet very easy, cation. But where did I recommend an excess? By all means, be careful with stoichiometry, and there shouldn't be enough extra iodide ions for iodomercurate to form.

I think iodomercurate is, like other halometallates, unstable at low pH, IIRC? Nitrate doesn't get scary as long as you're not too acidic -- 5% AcOH should precipitate it to a large degree if you do have trouble. The ref I have says "[HgI2] dissolves in alkalies to form complex salts".
« Last Edit: June 16, 2012, 08:30:13 PM by atara »

Tsathoggua

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #13 on: July 25, 2012, 01:15:51 AM »
Precipitation with an -SH-containing aminoacid is an interesting idea. The Hg(II) will complex with it, and precipitate out mercury sulfide/cinnabar, which is just about insoluble in water.

Filter off, and (outside, making sure to trap any Hg vapor with a suspension of sulfur, soaked into towels perhaps), roast the sulfide. This will drive off Hg vapor, which could be condensed easily enough, no?
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some_one

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Re: OTC utilization of Hg and Hg2+ waste
« Reply #14 on: July 28, 2012, 01:06:19 PM »
Quote from: carl_nnabis on June 15, 2012, 10:45:19 AM
indeed fresh you could use the same metal a dentist uses for his amalgam, but i think these times it is mainly silver thats used ;D interesting that in some european countries and in japan too the use of amalgam by dentists is forbidden now...

yah i was told a cool story about those fillings.
a company sent a known sample of mercury containing to different analytic labs all over the world. the results came back and only one out of 20 labs or so returned the right mercury concentration. as the other labs were investing their failure, it occurred to them that they have all one in common.... employees with amalgam fillings. the only lab who out ruled this possibility was the one returning the right data.
thats a cool story, huh?
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