A friend of mine sent me a copy of a PDF called "A Comprehensive Review of Black Powder" it's a document created in 1985 by the US Army Ballistic Research Laboratory, in which they test and compare various BP and talk about the different manufacturing techniques and the effects they have on the powder they produce.
In one section they talk about the technique the army uses to manufacture BP, instead of using a ball mill or wheel mill they use a jet mill. I've done some research and can't come up with any information on jet mills... I'm looking for how they work. The results they got were comparable and in some cases slightly better then the traditional Ball Mill and wheel mill.
There seams to be lots of pictures of jet mills out there but no explication of how they work.
Does anyone here know anything about jet mill and how they work?
Jet Mill?
Started by bigtonyicu, May 26 2008 01:37 PM
3 replies to this topic
#2
karlfoxman
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Posted 26 May 2008 - 01:44 PM
http://www.freepaten...om/3903219.html
Found this, sounds quite complex and way above needs of the amature pyrotechnic. Ball Mills work fine for me, I can make very very fast Blackpowder these days. Research on Ball Milling, Passfire as some good reading as will rec.pyrotecnics. We have two ball mills the large one we made is in fact better than the large one we bought.
Found this, sounds quite complex and way above needs of the amature pyrotechnic. Ball Mills work fine for me, I can make very very fast Blackpowder these days. Research on Ball Milling, Passfire as some good reading as will rec.pyrotecnics. We have two ball mills the large one we made is in fact better than the large one we bought.
#3
bigtonyicu
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Posted 26 May 2008 - 01:53 PM
http://www.freepaten...om/3903219.html
Found this, sounds quite complex and way above needs of the amature pyrotechnic. Ball Mills work fine for me, I can make very very fast Blackpowder these days. Research on Ball Milling, Passfire as some good reading as will rec.pyrotecnics. We have two ball mills the large one we made is in fact better than the large one we bought.
I also have a good large
(maybe too large... if there is such a thing) Ball Mill. i agree after reading this article that it's way to complicated for nothing... I just liked the production rate the article described and the single step production on the BP... thanks for the link
#4
Mumbles
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Posted 02 June 2008 - 12:25 AM
There is a military BP plant in Indiana in the US that produces all the military BP(I think). It is all done by the jet mill process, and is continuously fed I believe.
Anyway, a jet mill functions by introducing high velocity air streams into a donut shaped cavity where the sample is fed it. The grinding action is solely from collisions between the particles meant to be ground. I've seen some with ridged walls. I'd imagine wall collisions will also play a role. As the particles get finer, and thus lighter, they tend to migrate toward the center where they can be discharged.
This website helps somewhat.
http://www.jetpul.co...ip/milloper.htm
Anyway, a jet mill functions by introducing high velocity air streams into a donut shaped cavity where the sample is fed it. The grinding action is solely from collisions between the particles meant to be ground. I've seen some with ridged walls. I'd imagine wall collisions will also play a role. As the particles get finer, and thus lighter, they tend to migrate toward the center where they can be discharged.
This website helps somewhat.
http://www.jetpul.co...ip/milloper.htm
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