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Author: Subject: Extracting chromates from stainless steel
Rainwater
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[*] posted on 27-3-2024 at 13:47


They NaOH is an isolation step. As it helps react FexClx to oxides
If starting from pure metal, you should be able to go stright to the oxidizer.
Searching for a reference now. Its in one of these books
Edit: still searching, got at least 1 book for every unfinished project

[Edited on 28-3-2024 by Rainwater]
Not the book im looking for but should help
https://www.sciencemadness.org/talk/viewthread.php?tid=6896

[Edited on 28-3-2024 by Rainwater]




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[*] posted on 28-3-2024 at 09:27


This looks promising, i'm getting an almost luminance orange colour now.
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[*] posted on 28-3-2024 at 11:49


Quote: Originally posted by Rainwater  
They NaOH is an isolation step. As it helps react FexClx to oxides
If starting from pure metal, you should be able to go stright to the oxidizer.
Searching for a reference now. Its in one of these books
Edit: still searching, got at least 1 book for every unfinished project

[Edited on 28-3-2024 by Rainwater]
Not the book im looking for but should help
https://www.sciencemadness.org/talk/viewthread.php?tid=6896

[Edited on 28-3-2024 by Rainwater]

Thats what am thinking too, once you oxidize the Cr it will stay in sln while the remaining metal-iron hydroxide precipitate will be discarded with filtering.

React SS/Cr with acid - filter keep filtrate - react with carbonate(or bicarbonate?) - filter and keep precipitate - oxidize - filter and keep filtrate - acidify to dichromate - react with KCl and keep precipitate.

[Edited on 28-3-2024 by fx-991ex]
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Rainwater
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[*] posted on 28-3-2024 at 18:56


ISBN 0130-39913-2
Catherine E. Housecroft Inorganic Chemistry 2nd Edition
Chapter 21. Pg 606
Explains the ph solubility and how to convert chromium to all sorts of perty colors.

This isnt the reference im looking for but its a good one. Betterworldbooks has a few copies right now for less than 5$

I know i have a waste treatment and recovery book that goes through the entire process of extracting every transition metal from anything (dirt, biomatter, sewage and industrial streams).




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[*] posted on 5-4-2024 at 12:53


Quote: Originally posted by Chemgineer  
This looks promising, i'm getting an almost luminance orange colour now.


So I left this filtering through a coffee filter and some cotton wool while I went away for a week.

I got back and the coffee filter is now brown/black and the cotton wool falls apart. I guess I do indeed have a good oxidiser.
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