TheMrbunGee
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Registered: 13-7-2016
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Cleaning sintered glass filter from super tiny graphite mess.
I ruined my filter with graphite particles, I was hoping to remove that stuff with hot piranha-ish solution (-ish - because I have only 10% H2O2)
It is now sitting there for a while, cooled, of course but it haven't got even a bit whiter.
Is there any other way?
Filter works fine, it is just esthetics.. And the challenge, maybe..
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SWIM
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I've heard dichromate and sulfuric acid can clean that, but I've never tried it.
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TheMrbunGee
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Ok, that's a possibility! I don't have any dichromates on me, so I will wait for confirmation, before I drive after some.
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Texium
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I've done it. It works
quite well, though I prefer using piranha now that I have 27% peroxide since it's much safer and easier to dispose of.
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TheMrbunGee
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Okay, thank You both! 
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unionised
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You can remove graphite using air.
You may need to heat the item to get a reaction rate you are happy with.
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DavidJR
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Quote: Originally posted by Texium (zts16)  | | I've done it. It works
quite well, though I prefer using piranha now that I have 27% peroxide since it's much safer and easier to dispose of. |
Easier to dispose of, yes certainly. But it’s not safer. Far from it. There have been numerous serious lab accidents resulting from the use of
piranha solution.
I’ve had luck removing activated carbon powder from frits using piranha made with drain cleaner acid and 12% hydrogen peroxide. I assume graphite
powder is more difficult to remove due to surface area to mass ratio, but it should still work slowly I think.
One good think about chromic acid is that you can reuse it indefinitely - piranha goes off pretty quickly and must be prepared immediately before use.
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