Romix
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How to [recover] dissolved in acid Tin
Hello again Dear forum members.
Any literature you could recommend?
Or maybe you have experience?
Displaced Tin out of solution with Aluminium, not melting.
Any ways of recovering it from solution as metal in bars?
[Edit by mod]
Title change for clarification.
(Replaced "melt" with "recover")
[Edited on 8-6-2024 by j_sum1]
[Edited on 8-6-2024 by Romix]
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bnull
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Did you try electrolysis?
Quod scripsi, scripsi.
B. N. Ull
P.S.: Did you know that we have a Library?
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Romix
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Not yet.
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Rainwater
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You can try cementing the tin out of solution with a more reactive metal such as iron or aluminum.
The results will vary based on ph and the exact composition of the solution.
Here is some reading explaining the reaction
https://chem.libretexts.org/Courses/Oregon_Institute_of_Tech...
[Edited on 8-6-2024 by Rainwater]
"You can't do that" - challenge accepted
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j_sum1
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Electrolysis of tin solutions is very easy.
Only a couple of issues I can think of. If the solution is too acidic, the crystals can redissolve quickly when the voltage is turned off. Also, the
tin crystals grow quickly enough that you could have shorting problems.
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Sulaiman
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As above, tin electrolysis is super easy,
Blatant promotion of my own video (real time)
https://www.youtube.com/watch?v=G1sq4hnrBgM
At low current densities you may be able to plate a cathode,
putting your recovered metal, connected as an anode, in a membrane.
Sreetips silver cell on YouTube comes to mind.
PS
What kind of volume are you dealing with?
What acid, tin concentration in solution, contaminants?
Have you processed all with Al, or just a sample?
[Edited on 8-6-2024 by Sulaiman]
CAUTION : Hobby Chemist, not Professional or even Amateur
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Romix
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Quote: Originally posted by Sulaiman  | As above, tin electrolysis is super easy,
Blatant promotion of my own video (real time)
https://www.youtube.com/watch?v=G1sq4hnrBgM
At low current densities you may be able to plate a cathode,
putting your recovered metal, connected as an anode, in a membrane.
Sreetips silver cell on YouTube comes to mind.
PS
What kind of volume are you dealing with?
What acid, tin concentration in solution, contaminants?
Have you processed all with Al, or just a sample?
[Edited on 8-6-2024 by Sulaiman] |
Sample!
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Sulaiman
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Two options; (assuming HCl is the acid)
Electrolysis of the bulk liquid, graphite anode?
HCl and Cl2 gasses may be evolved.
Slow (low over-voltage) plating will minimise electrodeposition of other metals.
Al replacement then heating above 180 C to sublime off the aluminium chloride,
turn up the heat, add a little borax, and melt your tin.
(try some borax with your existing processed sample)
EDIT: this is wrong based on an incorrect assumption of mine. See Rainwater's post below.
[Edited on 9-6-2024 by Sulaiman]
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chornedsnorkack
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What is the pH range where tin precipitates as metal on cathode?
Too low pH, and cathode will reduce H2, not Sn
Too high pH, and Sn precipitates as Sn(OH)2.
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Rainwater
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| Quote: Originally posted by Sulaiman |
Al replacement then heating above 180 C to sublime off the aluminium chloride,
turn up the heat, add a little borax, and melt your tin. |
That will only work with anhydrous AlCl3 once the Al is dissolved in water, it changes.... maybe the word is complexes...... with water
forming [Al(H2O)6]Cl3. Heating over 100c will release water and HCl, leaving a mixture of Al hydroxide and oxides.
"You can't do that" - challenge accepted
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bnull
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@Romix: How much tin are we talking about? What acid did you use?
If you're not in a hurry, you may try this: neutralize the excess acid with sodium carbonate; sandpaper the interior of a paint can or other
disposable steel container; attach a piece of aluminum to the outside of the can by means of a copper wire; fill the can with the solution and immerse
the aluminum piece on it (don't let it touch the bottom). It will take some time, it is boring as hell to watch any length of the process, and I only
resort to that when I don't want to electrolyse stuff.
Quod scripsi, scripsi.
B. N. Ull
P.S.: Did you know that we have a Library?
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Romix
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Sorry guys, too many of you asked too many questions all at once, I'm confused.
Displaced Sn with Al out of Chloride, yes, metal isn't melting!
I'll leave a piece of 99% plumbing solder in HCl for few months then will electrolyse solution and try melting after.
Volume from small experiment up to buying tons of PCBs dirt cheap and processing them. Legally or not...
Pewter is also an interesting alloy.
[Edited on 10-6-2024 by Romix]
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