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Author: Subject: Final reduction of alkali Nitrate/Nitrite
Globey
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[*] posted on 9-3-2009 at 07:08
Final reduction of alkali Nitrate/Nitrite


If you heat Sodium nitrate beyond decomposition to nitrite and 1/2O2, what is the final reduction (in absence of any additional reducing agent)? Imagine it depends on the amount of heat applied. Also with sodium bicarbonate, for example, after the carbonate is formed, what sort of heat is needed to turn it into sodium oxide? Kiln temperatures and beyond? Making the oxide in this way would be a good way of making very pure LYE OTC.
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[*] posted on 9-3-2009 at 08:21


I had a NaNO3-melt not decomposing much even when it was glowing (in the 500s of [Celsius]), although in the books the _starting_ temp. for decomposition is given to about 340 [Cels] ...
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[*] posted on 9-3-2009 at 09:45


According to:
Journal of Thermal Analysis and Calorimetry, Vol. 60 (2000), p.305–-312,
thermal decomp. of NaNO3 starts at about ~700 C (air atmosphere).
Final product is Na2O, but this stage is obtained at temp. ~1000 C. Decomositin of NaNO2 is also described in this paper.
On the picture: NaNO3 (a) and NaNO2 (b) thermic curves.

wedr.JPG - 19kB
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