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Author: Subject: Cleaning copper chromite from frit glass
jderimig
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[*] posted on 17-12-2019 at 12:08
Cleaning copper chromite from frit glass


I made some copper chromite and used the frit to pull water after the acedic acid wash.

I was able to clean the frit surface with soap and water and although it functional it still has some gray stain.

Any suggestions on what to try? HCL acid doesn't touch it and I tried sulphuric acid drain cleaner (pure is on the way) and that didn't it touch it either.

Those are the only things I have tried so far. I plan to try Chromic Acid next but that will be a few days.
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DavidJR
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[*] posted on 17-12-2019 at 15:43


Try soaking in a solution of EDTA disodium.
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rockyit98
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[*] posted on 17-12-2019 at 20:25


what about con. HNO3? maybe it will oxidize it back to copper chromate .i guess con. Ammonia can be used to dissolve copper chromate if good luck would have it even copper chromite itself.



far as i know everything is trying to be an equilibrium.
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jderimig
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[*] posted on 18-12-2019 at 06:08


Quote: Originally posted by DavidJR  
Try soaking in a solution of EDTA disodium.


That is on my list to try, trying to source some locally.
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jderimig
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[*] posted on 18-12-2019 at 06:12


Quote: Originally posted by rockyit98  
what about con. HNO3? maybe it will oxidize it back to copper chromate .i guess con. Ammonia can be used to dissolve copper chromate if good luck would have it even copper chromite itself.


I have trying 30% aqueous ammonia and there didn't seem to be a reaction. I will try some HNO3 after I distill some.

I have some KMnO4 on the way as I found in another thread that it might convert Cr2O3 so its soluable in HCL or HNO3. So maybe if it acts on Cr3O3 it might work on CuCr2O5?

Keep the suggestions coming.
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DavidJR
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[*] posted on 18-12-2019 at 07:06


In future don't use frits for filtering anything which you don't know how to dissolve again later. It can sometimes be completely impossible to get them clean again.

A traditional Buchner funnel with filter paper does not have this problem (because the filter paper is disposable).
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jderimig
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[*] posted on 18-12-2019 at 07:28


Quote: Originally posted by DavidJR  
In future don't use frits for filtering anything which you don't know how to dissolve again later. It can sometimes be completely impossible to get them clean again.

A traditional Buchner funnel with filter paper does not have this problem (because the filter paper is disposable).


Yup, lesson learned. I saw the method for producing CuCr in a video and he used a frit filter in the final step that was white as the driven snow. So I figured he'd done this before and cleaning the frit would not be a space shot.
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PirateDocBrown
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[*] posted on 18-12-2019 at 08:17


I often place a circle of filter paper on top of the frit, you get a double filtering effect, and much crap is kept out of the frit.



Phlogiston manufacturer/supplier.

For all your phlogiston needs.
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jderimig
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[*] posted on 23-12-2019 at 11:40


Update: Think I found a solution.

Soak frit in solution of KMn04 (I did overnight).
Then soak in concentrated HCL. Seems to be doing the trick.
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