ball milling for black powder

choosing ball milling media for firework chemical milling skylighter, inc

choosing ball milling media for firework chemical milling skylighter, inc

In his book Ball Milling Theory and Practice for the Amateur Pyrotechnician, Lloyd includes a section on casting your own lead media. Some folks melt used lead automobile wheel weights or hardened linotype as the raw material for casting media. Lloyd does begin this chapter with the warning, though: "Casting metals is dangerous. If you don't have experience, make up the molds, then seek a plumber or firearms reloader for assistance." There are other types of media as well. Here's a shot of some stainless steel media and ceramic media. The stainless steel must be spark-resistant, non-magnetic steel in the 300-series. Alloys 304 and 316 are the most common stainless steels of this type. High-density alumina ceramic media is the type I've heard of most often being used in ball mills.

milling black powder - pyrotechnics - apc forum

milling black powder - pyrotechnics - apc forum

Just wanted to get a poll on varying options of most efficient yet safest way to mill black powder without a ball mill. I used to use a coffee grinder however the last time I milled some I resorted to a mortar and pestle instead, which was far too much work. I know ball milling is the most common for large quantities.

Mortar and Pestle is NOT safe. It will work, until it doesnt and what you're mixing blows up in your face and puts you in the hospital. Learned that lesson the hard way back in high school a couple decades back.

Well, you could try grinding your chemicals individually as fine as possible. The finer the better. Then screen mix all three (or four, if you plan to use dextrin). I don't know which method you plan to use to granulate/corn, but I feel, wetting, pressing (to a minumum density of 1.7 g/ml (cc3) and corning would give you the best chance of a good outcome. It still may not be an optimum BP, but if it works for your use that's all that counts. Try a small batch and test it out! There is also the CIA method. I have never used it, but some say it works.

Not knowing what gdeputy did has me thinking that a there was something that sparked and most likely not the suffer, charcoal, of potassium. The Mortar and Pestle would cause it as well if it was a regular set, if it was a homemade set that could be different. So saying that I would think that there was something else like metal in the mix.

If you do grind your chemicals use 3 different grinders that will always be used for that class of chemicals. One for fuel, one for oxidizer and of course one for charcoal. Then hand mix.............Now that's my 2 cents I hope that what ever you do you are safe.............................................Pat

I would use the coffee grinder to reduce the KNO3 and screen it to only get the finest particles then use the mortar and pestle to further reduce it. Air float charcoal and sulfur are likely already finer than your capabilities would allow so I would screen mix those and some dextrin into the nitrate several times and go with it. I imagine if you pucked and corned that powder it would improve it a bit. I'd be pinching pennies and picking up beer cans to get me a mill and media though.

I made my ball mill for less than $20. It may not be the greatest in the world, but I have made a lot of batches of great BP with it. With a little creativeness and ingenuity, you would be surprised what can be made for very cheap. Don't forget to check out surplus places like American Science and Surplus for parts!

Thanks for all the replies, yeah I only have the need to mill back powder once a year for the black powder and nitrocellulose lacquer igniters that I make. It's BP that's is already granulated and I just have to refine it more. A cheap ball mill will definitely have to be in the budget for the future!

Thanks for all the replies, yeah I only have the need to mill back powder once a year for the black powder and nitrocellulose lacquer igniters that I make. It's BP that's is already granulated and I just have to refine it more. A cheap ball mill will definitely have to be in the budget for the future!

If you're milling/grinding mixed BP in a coffee grinder, i hope you're at least doing it remotely, not standing nearby or holding it in your hand, and in small quantities. Not trying to be a downer, but burns suck.

If you decide that you want to use a mortar and pestle, be prepared for blisters and something to protect your head as you start to bang your head on something out of frustration due to dismal performance of the bp.

Like everyone is saying, a ball mill really is the best method. It would take forever to mortar and pestle it, and even then it would be pretty slow BP. I'll just point out that if your mortar and pestle are clean and not contaminated with something like potassium chlorate, this method is safe. BP does not normal friction ignite... I suppose it can, but I've done a lot tests with that sort of thing, and never ignited it be being careless.

I also made a ball mill. I think I spent about $10 on mine. I bought an old fan from Goodwill, and some pipe fitting parts from the local Habitat for Humanity. And then I took apart an old scanner to get the steel rods. Some scrap lumber and a few hours later, and I had myself a ball mill. Not fancy, but it works.

ball mill | pyrodata

ball mill | pyrodata

A ball mill, a type of crusher, is a cylindrical device used to grind chemicals or mix compositions. Ball mills rotate around a horizontal axis, partially filled with the material to be ground plus the grinding medium, ideally non sparking milling media like lead balls. An internal cascading effect reduces the material to a fine powder. Industrial ball mills can operate continuously, fed at one end and discharged at the other. Large to medium ball mills are mechanically rotated on their axis, but small ones normally consist of a cylindrical capped container that sits on two drive shafts (pulleys and belts are used to transmit rotary motion).

Ball mills used to produce explosive mixtures such as black powder should never be operated inside buildings inhabited by people. They require a separate facility away from buildings and flammable substances and protected from the public with a suitable defence wall or barricade made of something with some mass to absorb possible fragments from the exploding ball mill. A proper warning sign telling passers by of the explosive conditions behind the wall {on all four sides} is recommended. Venting to sky is needed to allow explosive gases to escape. This vent should be screened with heavy wire mesh. Preferably, a padlocked door for user access only.

Ball milling is more dangerous method of mixing pyrotechnic compositions as it produces large amounts of shock and friction. Lead balls or any non sparking grinding media are used inside the ball mill to 'crush' the ingredients, non sparking grinding media are essential for safety when preparing pyrotechnic chemicals such as black powder. As with the screen method it should only be practiced with compositions that are insensitive to shock and friction.

Utilizing this method of mixing can be just as safe as others if you are mixing compositions that contain an oxidizer, but no fuel and visa versa. For example, you can safely mix fuels like charcoal and sulfur together or oxidizers like potassium nitrate on their own. If you choose to mix compositions this way then after milling, just screen them together (via the screen method) until the mixture is completely homogeneous. This is also a safe method when mixing compositions that have no sensitivity to shock or friction.

A ball mill will deliver a superior homogeneous mixture with the ingredients being ground together by the milling media. It method of mixing is mainly used in making powders such as meal, pulverone, black powder etc. To reduce the risk even of accidental ignition even further, the mixture can be moistened with water or an appropriate solvent.

As a rule of thumb in dry grinding, milling jar should be filled half full of it's volume with milling media and a quarter full of it's volume with material to be milled (optimum loading is not possible with small rock tumblers, since they will overload). The rotational speed of the milling jar should be ~65% of the critical speed of the jar. The critical speed is 'the speed when a ball mill becomes a centrifuge' and may be calculated for a specific jar and ball diameters as follows: CS[rpm] = 2676 / SQR( JarID[mm]-BallOD[mm] ). The material to be milled should be reduced to appr. 8 mesh prior ball milling. Proper milling time may be tested by taking and sieving samples during the test milling. During sampling it should be checked, that the mill does not 'run dry'; the media should be just covered with the material. Running mill dry and/or of excessive period of time, will result in wear of the milling media and contamination of the material. Slight over filling will reduce the risk of running dry - especially charcoal will loose it's occupied volume during milling.

ball-milling mos2/carbon black hybrid material for catalyzing hydrogen evolution reaction in acidic medium - sciencedirect

ball-milling mos2/carbon black hybrid material for catalyzing hydrogen evolution reaction in acidic medium - sciencedirect

Replacing platinum for catalyzing hydrogen evolution reaction (HER) in acidic medium remains great challenges. Herein, we prepared few-layered MoS2 by ball milling as an efficient catalyst for HER in acidic medium. The activity of as-prepared MoS2 had a strong dependence on the ball milling time. Furthermore, Ketjen Black EC 300J was added into the ball-milled MoS2 followed by a second ball milling, and the resultant MoS2/carbon black hybrid material showed a much higher HER activity than MoS2 and carbon black alone. The enhanced activity of the MoS2/carbon black hybrid material was attributed to the increased abundance of catalytic edge sites of MoS2 and excellent electrical coupling to the underlying carbon network.

MoS2/Ketjen Black EC 300J hybrid material demonstrates high activity for hydrogen evolution reaction due to increased abundance of MoS2 edge sites and excellent electrical coupling to the underlying carbon network.Download : Download high-res image (442KB)Download : Download full-size image

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