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Author: Subject: Iron filings mesh size
organicchemist25
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[*] posted on 26-7-2014 at 08:37
Iron filings mesh size


I am looking to buy some iron filings and it has been a small challenge. The companies will either not sell to me, the filings are not lab quality (for magnetism demos), or the mesh size it not what my reaction calls for.

So, my question is, if i need 80 mesh size iron filings can I get away with 40-50 mesh?

I know it is larger than what I am looking for, but just wanting to ask.

Will it work or not? Would you please provide a little explanation either way? I am not sure if surface area place a role, well a determining factor anyways.

:)





[Edited on 26-7-2014 by organicchemist25]
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TheChemiKid
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[*] posted on 26-7-2014 at 16:50


What reaction are you attempting?



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Zephyr
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[*] posted on 26-7-2014 at 17:11


Quote: Originally posted by organicchemist25  
(for magnetism demos)


If this is the only purpose of the fillings, I do not think the size of the fillings will matter very much, and neither will any small impurities. Also, if the impurities are not magnetic, they can be separated easily using a magnet to skim off the iron.




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TheChemiKid
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[*] posted on 26-7-2014 at 17:21


That is not the purpose, that is just the purpose of some of the filings being sold.



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organicchemist25
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[*] posted on 27-7-2014 at 12:41


o-toluidine

Fe + HCl + C7H7NO2 ------> C7H9N (omitted bi-products and balancing)
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aga
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[*] posted on 27-7-2014 at 14:30


File some iron yourself ?

Yes, it is tedious work, yet it yeilds iron filings.




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organicchemist25
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[*] posted on 28-7-2014 at 07:31


I have thought about that, but wouldn't I need something to mill it with to get it down that "fine" ? If, it is not that complicated to get it that small, I am definitely interested in doing so.
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organicchemist25
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[*] posted on 28-7-2014 at 07:33


Any techniques to possibly share on getting it that small in microns? I have a super fine metal file to get started.
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[*] posted on 28-7-2014 at 13:20


I know that several procedures for the reduction of nitro groups to amine groups call for iron filings. They are touted to be the most efficient and economical. I have not had good luck with them. My problem was that they are so heavy that they are hard to keep in suspension. Also they make glassware cleanup a real pain. Instead, I highly recommend using tin shot. (I have seen tin available at Wal-mart as fishing weight.)

If you do use Fe I recommend getting it quite fine and use of strong mechanical stirring.




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organicchemist25
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[*] posted on 30-3-2016 at 18:43


I know this is an old thread, but you have personally had good results with tin in place of iron, Magpie? Also, would I file down the tin shot with a super fine file? I have some of those.

Thanks for all your feedback, Magpie! I learn things from you :) you always have nice, detailed threads on your experiments.
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[*] posted on 30-3-2016 at 19:16


Sodium dithionite is another good reagent for reducing nitro groups to amino groups.
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