Sciencemadness Discussion Board

Preparing Mn salts from battery grade MnO2

rstar - 10-10-2012 at 09:45

Wel i've got dumps of MnO2 from batteries.

Wat salts can i make easily now ? I also hv some K2S2O5. Telll if it can be used in the processes :D

Bot0nist - 10-10-2012 at 10:47

Have you searched the forum and youtube? What did you find?

See my signature...

CrEaTiVePyroScience - 10-10-2012 at 11:49

The MnO2 paste is probably mixed with zinc or ammonium chloride. Mix it with water and filter it off.
Please note that this MnO2 isn't very pure ;)

You could make MnSO4:
Mix 30grams of oxalic acid, 300mL of water, and 13mL of sulfuric acid. Then add the manganese dioxide continually until the solution stops bubbling.

[Edited on 10-10-2012 by CrEaTiVePyroScience]

rstar - 11-10-2012 at 01:47

can my K2S2O5 reduce MnO2 ?

plante1999 - 11-10-2012 at 03:58

Make a solution of sodium bisulphate and one of sodium metabisulphite, in the bisulphate solution mix purified MnO2 and poor slowly with a lot of stiring the sodium metabisulphite in. After addition wait an hour and filter the mix to get slightly pink colored solution. Precipitate the manganese using sodium carbonate solution. Filter the manganese carbonate and dissolve it in HCl to get manganese chloride. Do not keep the manganese carbonate since it turn quite readily to manganese dioxide.

[Edited on 11-10-2012 by plante1999]

blogfast25 - 11-10-2012 at 05:08

Quote: Originally posted by plante1999  
Do not keep the manganese carbonate since it turn quite readily to manganese dioxide.

[Edited on 11-10-2012 by plante1999]


Not true: it's quite stable and the wet precipitate can be dried w/o problems. It's commercially available too. MnCO3 is about as stable as MnCl2.

You may be confusing with Mn(OH)2: freshly precipitated that oxidises to MnO2 by air oxygen very quickly.


[Edited on 11-10-2012 by blogfast25]

rstar - 11-10-2012 at 06:07

well.... if i get the black mixture from a old, used up, battery ... can i still make Mn<sup>2+</sup> salts from that

blogfast25 - 11-10-2012 at 07:59

Quote: Originally posted by rstar  
well.... if i get the black mixture from a old, used up, battery ... can i still make Mn<sup>2+</sup> salts from that


Yes, there are numerous methods and numerous threads about it here. UTSF.