metalresearcher
National Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 737
Registered: 7-9-2010
Member Is Offline
Mood: Reactive
|
|
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 ?
|
|
Σldritch
Hazard to Others
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 309
Registered: 22-3-2016
Member Is Offline
Mood: No Mood
|
|
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.
|
|
metalresearcher
National Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 737
Registered: 7-9-2010
Member Is Offline
Mood: Reactive
|
|
Quote: Originally posted by Σldritch ![](images/xpblue/lastpost.gif) | 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,
|
|
UC235
National Hazard
![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif) ![*](images/xpblue/star.gif)
Posts: 565
Registered: 28-12-2014
Member Is Offline
Mood: No Mood
|
|
Quote: Originally posted by metalresearcher ![](images/xpblue/lastpost.gif) | Quote: Originally posted by Σldritch ![](images/xpblue/lastpost.gif) | 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.
|
|