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My ballmilled Black Powder .. any suggestion?


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#1 MinamotoKobayashi

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Posted 11 August 2017 - 07:20 PM

As suggested by a kindly user in APC forum, I created BP with my good ballmill in this way:

 

Mix 1:
75 parts potassium nitrate
5  parts charcoal
 
Mix 2:
10 parts charcoal
10 parts sulphur
 
I used airfloat pine charcoal, potassium nitrate without anticaking and sulphur.
Potassium nitrate and charcoal was dried under the sunlight for half day.
 
I mixed twice the two compounds thru a 20 mesh screen.
In the video in attachment You can see how burn 1/3 of a tea spoon of this BP into my kitchen sink  :P
Can anyone tell me if my BP is fast enough to be considered good?
For the momment I will use BP only to coating rice hulls.
 
P.S: the residual was a very small amount of potassium nitrate, but it looks like fine granulated, not pulverized.

Attached Files


Edited by MinamotoKobayashi, 11 August 2017 - 07:24 PM.


#2 XMax

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Posted 11 August 2017 - 10:28 PM

I would say it's fast enough to lift shells but if you want to make a really hard break you might have to tune it some!

#3 DavidF

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Posted 11 August 2017 - 11:06 PM

Testing any pyrotechnics in a home is not a good idea. If you are willing to test them in your home, you are willing to make them there too, IMHO. That has caused a lot of problems for others already. Please don't do it. 

 

I would grind the #2 Mix longer, and use a 40 mesh sieve.


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#4 MinamotoKobayashi

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Posted 12 August 2017 - 03:40 PM

Thanks.

David, I live alone in an apartment. I have no open spaces, working at home is my only chance.

Don't worry, I'm not a newbye, I work with sugar rockets indoor from many years.

The key is to work with small batches and keep the other powders far away, well sealed and placed in other rooms.

I'm always protected with goggles, mask, gloves and appropriate cloths.

I have a fire estinguisher and wet rags always ready near me.

No one except me myself can be injuried in case of bad luck, so don't worry  :P

 

Ok, I will grind the mix2 longer and I will use 40 mesh sieve.

The mix 1 after 1 hours tends to create a big lump against the end of the ballmill barrell, also if the compound is well dried.

Unluckly the potassium nitrate without anticaking tends always to create big lumps ....


Edited by MinamotoKobayashi, 12 August 2017 - 03:41 PM.


#5 Mumbles

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Posted 12 August 2017 - 04:12 PM

If you don't have anywhere to work safely (and it sounds like you don't), then you shouldn't be doing this at all.

 

Also, something is not well dried if it's clumping after an hour.  Charcoal can hold onto water too.


Just so you guys quit asking, here is the link to the old forum. http://www.xsorbit2....forum/index.cgi

The sky is my canvas, and I have 2,113 pounds of powdered paint in the workshop.

#6 MinamotoKobayashi

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Posted 12 August 2017 - 04:39 PM

Hi Mumbles.

I have well dried both potassium nitrate and carchoal under the sun and inside my ventilated oven at 100 °C.

This issue happens only when I'm using potassium nitrate without anticaking.

If I use potassium nitrate with anticaking everything goes fine.

 

I have an important question for You: the potassium nitrate with anticaking can cause issues in some uses?

Can I replace always the potassium without anticaking with the anticaking version without having troubles? (for example, I heard

that the anticaking version it is not suitable to make coated rice hulls ...)


Edited by MinamotoKobayashi, 12 August 2017 - 04:40 PM.


#7 starxplor

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Posted 15 August 2017 - 11:27 PM

:excl: :o :excl:

 

Please do not put anyone else who lives in your apartment building/complex at such risk!

 

Imagine how upset you would be if a family member of yours was in an apartment complex where someone else caught them on fire.


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#8 Oinikis

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Posted 17 August 2017 - 08:50 AM

While I am also concerned about the safety, may I ask, why do you mill in two seperate mixes? I always mixed it all up and milled.


I feel the need, the need for speed.

#9 MrB

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Posted 17 August 2017 - 05:40 PM

While I am also concerned about the safety, may I ask, why do you mill in two seperate mixes? I always mixed it all up and milled.

 

It's quite common to run two "batches" of charcoal, and screen them together, as a mean to minimize the risk of the mill, or any handling in relation to the milling procedure, causing unexpected rapid combustion with undesirable results.

Sulfur / charcoal, or KNO3 / charcoal, burns poorly.

Combining, and milling, rather then milling the two different compositions, and screening them together, makes a better BP, but has some downsides in the safety department. Most of us decide to deal with those issues when we get a ball mill, some don't.



#10 MinamotoKobayashi

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Posted 18 August 2017 - 02:53 PM

Yes MrB You're right. I alive alone in an apartment and I cannot risk to mill BP indoor. Also If I use brass media balls, gum barrell and screened airfloat charcoal (to elimite also the risk of unwanted small metal pieces), I want to be safe.

 

For eveyone that fear what I have done: it was a 1/2 tea spoon of BP inside a metal kitchen sink. The fuse was locked with a strong tape on the floor. On the left and on the right I have much water, and on the back a fire estinguisher.

I was almost naked, and also my hamster was far away from the place.

Now anyone explain me how can be dangerous to ignite about 5 grams of BP in such environment !!!



#11 Mumbles

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Posted 18 August 2017 - 07:20 PM

Yes MrB You're right. I alive alone in an apartment and I cannot risk to mill BP indoor. Also If I use brass media balls, gum barrell and screened airfloat charcoal (to elimite also the risk of unwanted small metal pieces), I want to be safe.

 

For eveyone that fear what I have done: it was a 1/2 tea spoon of BP inside a metal kitchen sink. The fuse was locked with a strong tape on the floor. On the left and on the right I have much water, and on the back a fire estinguisher.

I was almost naked, and also my hamster was far away from the place.

Now anyone explain me how can be dangerous to ignite about 5 grams of BP in such environment !!!

 

You were indoors.  That is how it is dangerous.


Just so you guys quit asking, here is the link to the old forum. http://www.xsorbit2....forum/index.cgi

The sky is my canvas, and I have 2,113 pounds of powdered paint in the workshop.

#12 MinamotoKobayashi

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Posted 18 August 2017 - 09:58 PM

Mumbles, I know guys that were outdoors and had severe injuries simply shaking the ball mill barrell with BP inside, while I know people who combine every imprudence possible and imaginable inside the home and never do anything serious. I prepare 1/2 kg sugar rockets and 3" shells in my kitchen every day from 1 year and never had any kind of issues. Doing a firework is a risk, either inside or outside, with or without caution. If the fate want that You must blow up, You cannot do anything. Except to stop making fireworks, of course.


Edited by MinamotoKobayashi, 18 August 2017 - 09:59 PM.


#13 OldMarine

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Posted 18 August 2017 - 10:18 PM

I build shells and headers using completed stars and powder in my shed but I'd never mill BP, mix comps or God forbid, light any of them in here. I had a neighbor start a grease fire in her kitchen back when I lived in an apartment and if not for my renter's insurance I'd have been homeless and destitute. She would have been my total list of people to kill if I hadn't thought to get insurance.


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Come on! Name one other hobby in which you cheer as your money and hard work go up in smoke!

#14 rogeryermaw

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Posted 18 August 2017 - 11:09 PM

And when you do have that one incident and hurt not you but the neighbor's kids, you'll drive one more nail into the coffin of amateur pyrotechnics. And then well.....use your imagination. 


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#15 OldMarine

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Posted 18 August 2017 - 11:21 PM

I'm tired of hauling my gear including generator to my brother's spread to mill powder, so rather than take a chance on blowing a hole in the neighbor's house, I'm going to try DaveF's method of separate milling of the ingredients at home. Like marriage pyro is a hobby designed to ruin stupid people.


Come on! Name one other hobby in which you cheer as your money and hard work go up in smoke!

#16 MinamotoKobayashi

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Posted 19 August 2017 - 12:49 PM

LOL Oldmarine. In fact I do not have wife nor kids. This is a palace of not-married evergreen singles. And there aren't kids. Instead marriage, I prefer to ruin my life in other ways such as pyros.  :P 

For the other users: please stop to flame this thread, we are plently OT now ...



#17 MrB

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Posted 19 August 2017 - 09:43 PM

Well, most of us don't condone "unsafe" practices. Fiddling with pyro in a rental flat pretty much counts here.






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