metalresearcher
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Making white P on Youtube: how does this work ?
I found a rather easy method to make white P4 using NaPO3 (metaphosphate), SiO2 and Al powder and some table salt NaCl.
https://www.youtube.com/watch?v=mhFyVDBmDVk
How does the reaction work ? Presumably the Al reduces the phosphate to P4, but what does the SiO2 do ?
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Σldritch
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The "ideal" reaction is: 12 NaPO3 + 6 SiO2 + 20 Al = 3 P4 + 10 Al2O3 + 6 Na2SiO3 but it is probably a mixture of sodium silicate and sodium aluminate.
The sodium chloride is the flux.
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metalresearcher
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Quote: Originally posted by Σldritch  | | The "ideal" reaction is: 12 NaPO3 + 6 SiO2 + 20 Al = 3 P4 + 10 Al2O3 + 6 Na2SiO3 but it is probably a mixture of sodium silicate and sodium aluminate.
The sodium chloride is the flux. |
Thanks.
I want to replicate it with Ca3(PO4)2 (Ca orthophosphate) whuch should be possible,
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UC235
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| Quote: Originally posted by metalresearcher | | Quote: Originally posted by Σldritch | | The "ideal" reaction is: 12 NaPO3 + 6 SiO2 + 20 Al = 3 P4 + 10 Al2O3 + 6 Na2SiO3 but it is probably a mixture of sodium silicate and sodium aluminate.
The sodium chloride is the flux. |
Thanks.
I want to replicate it with Ca3(PO4)2 (Ca orthophosphate) whuch should be possible, |
Possibly if you ball mill it together, but the ability of the metaphosphate to melt likely ensures good contact between the reactants.
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