metalresearcher
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Slow motion of KClO4 + Al powder + S
Last week I finally made KClO4 by electrolyzing NaCl with MMO anode, converting it to NaClO3 and when the 'swimming pool' smell was gone, I put a PbO2
anode into it and converted it to NaClO4.
Adding a KCl solution precipitated the KClO4 which I let cool to 0 C and then rinsed the precipitate with ice cold water and then filtered it with a
Büchner funnel and dried.
I did some tests including the methylene blue which got purple with precipitate.
Long story short, I did some successful experiments with it and it is considerably slower than KClO3 except with Flash powder.
With my Sony camera I can take 960 fps videos which I slowed to 15 fps, here the result.
https://www.metallab.net/jwplayer/video.php?f=/forums/Flashp...
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woelen
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KClO4 indeed is much less reactive than KClO3. With fine Al-powder, however, even the fairly slow KClO4 reacts extremely violently. Very fine
Al-powder reacts extremely violently with nearly all oxidizers. E.g. with CuO or MnO2, both of which are not considered really good pyro-chemicals,
Al-powder can react explosively.
If you precipitated your KClO4 with KCl from a solution of NaClO4, which also still contains NaClO3, then most likely, your KClO4 contains a little
amount of KClO3 as well. This makes your product much more sensitive and more dangerous. If you have red phosphorus, then you could try mixing a tiny
amount of the very finely powdered red phosphorus with a tiny amount of finely ground KClO4. If the mix is free of KClO3, then you cannot easily
ignite the mix without fire. E.g. tapping a tiny amount of this mix with a hammer does not lead to explosion. If the KClO4 contains a little KClO3,
then the mix is much more sensitive, and then even gentle tapping of the mix with a hammer leads to explosion.
If you don't have red phosphorus, you could try mixing some of the KClO4 with finely powdered sulfur and hit this mix with a hammer. If there is KClO3
in the mix, then it explodes if you give a nice hard hit. If it is free of KClO3, then it will not explode on hitting. A mix of KClO4 and S also is
harder to ignite, you really must keep it in a flame for a while, before it sets off.
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Bedlasky
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Quote: Originally posted by woelen  | KClO4 indeed is much less reactive than KClO3. With fine Al-powder, however, even the fairly slow KClO4 reacts extremely violently. Very fine
Al-powder reacts extremely violently with nearly all oxidizers. E.g. with CuO or MnO2, both of which are not considered really good pyro-chemicals,
Al-powder can react explosively.
If you precipitated your KClO4 with KCl from a solution of NaClO4, which also still contains NaClO3, then most likely, your KClO4 contains a little
amount of KClO3 as well. This makes your product much more sensitive and more dangerous. If you have red phosphorus, then you could try mixing a tiny
amount of the very finely powdered red phosphorus with a tiny amount of finely ground KClO4. If the mix is free of KClO3, then you cannot easily
ignite the mix without fire. E.g. tapping a tiny amount of this mix with a hammer does not lead to explosion. If the KClO4 contains a little KClO3,
then the mix is much more sensitive, and then even gentle tapping of the mix with a hammer leads to explosion.
If you don't have red phosphorus, you could try mixing some of the KClO4 with finely powdered sulfur and hit this mix with a hammer. If there is KClO3
in the mix, then it explodes if you give a nice hard hit. If it is free of KClO3, then it will not explode on hitting. A mix of KClO4 and S also is
harder to ignite, you really must keep it in a flame for a while, before it sets off. |
Another good test would be adding little bit of solid into HCl. ClO2 would turn solution yellow. Or more sensitive test is adding solid into the
solution of aniline in HCl, chlorates give with aniline red coloration (this doesn't do that many oxidizers). Red coloration isn't stable, but it
persist for minute or two.
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metalresearcher
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| Quote: Originally posted by woelen |
If you don't have red phosphorus, you could try mixing some of the KClO4 with finely powdered sulfur and hit this mix with a hammer. If there is KClO3
in the mix, then it explodes if you give a nice hard hit. If it is free of KClO3, then it will not explode on hitting. A mix of KClO4 and S
also is harder to ignite, you really must keep it in a flame for a while, before it sets off. |
The bold text I already tried and it was indeed very slow, I had to keep the burner flame to the mix to keep it sustainable.
I'll try with a hammer hit and with conc. HCl solution.
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