knowledgeSponge
Harmless
Posts: 3
Registered: 8-9-2015
Member Is Offline
Mood: No Mood
|
|
NaOH, S and Al flash.
Good day!
I saw some video on Youtube, where guy made something like flash powder from Aluminium, sulphur and sodium hydroxide powders.
It burns really interesting. In description he wrote, that powder absorbs water from paper and ignites. I saw some gasses/smoke before it ignited. and
it takes some time from "smoking" to flash.
Can some of you guys explain the reactions happening there, because google doesnt help.
Video of that powder
|
|
|
byko3y
National Hazard
Posts: 721
Registered: 16-3-2015
Member Is Offline
Mood: dooM
|
|
I'm sure it's NaNO3.
|
|
|
knowledgeSponge
Harmless
Posts: 3
Registered: 8-9-2015
Member Is Offline
Mood: No Mood
|
|
You mean instead of NaOH? Should it work if that was NaNO3 ? Can NaNO3 could pull water out from paper so quickly?
|
|
|
blogfast25
International Hazard
Posts: 10562
Registered: 3-2-2008
Location: Neverland
Member Is Offline
Mood: No Mood
|
|
It's NaOH, not NaNO3. With NaNO3 it would burn much hotter. And it would not auto-ignite either.
Firstly NaOH reacts with Al forming sodium aluminate. This is a slow reaction but it does generate quite a bit of heat. Once hot enough you get 2 Al +
3 S === > Al2S3, which is both fast and very exothermic.
|
|
|
knowledgeSponge
Harmless
Posts: 3
Registered: 8-9-2015
Member Is Offline
Mood: No Mood
|
|
Quote: Originally posted by blogfast25  | It's NaOH, not NaNO3. With NaNO3 it would burn much hotter. And it would not auto-ignite either.
Firstly NaOH reacts with Al forming sodium aluminate. This is a slow reaction but it does generate quite a bit of heat. Once hot enough you get 2 Al +
3 S === > Al2S3, which is both fast and very exothermic. |
He described:
"Reacting mechanism might be related to NaOH, absorbing and reacting with water and that reacting with aluminum, both of wich makes a lot of heat and
ignites sulphur, which burning heats up to temperature, to react with aluminum!"
So that might be it?
|
|
|
blogfast25
International Hazard
Posts: 10562
Registered: 3-2-2008
Location: Neverland
Member Is Offline
Mood: No Mood
|
|
Something like that, yes.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
