The Bucket Cell - Start to Finish
Posted 23 September 2012 - 03:12 PM
This system will have no moving parts, and the only electricity will be for the electrodes themselves. I am going to use a drip acid system for pH that is based upon the acid demand ROT (rule of thumb) derived earlier. It'll also use the efficiency and length-of-run formulas we calculated from a number of runs in the past.
Behind the scenes, I am going to verify certain things like pH, chloride ion concentration, and temperature.
I left it with the bucket cell pretty much put together:
It could be run with just what's on the adapter: Electrodes, vent, acid port, thermometer port, sample/topoff port. But I wanted to try something I've thought about but never got around to implementing... a cannister that suspends solid KCl in the hot electrolyte, and which will hopefully deliver "bonus" chloride to the system during the days it is in operation.
It's made from standard PVC fittings with size adapters to neck it down from 2" to 1" male pipe thread. The body of the cannister is drilled with hundreds of holes, which was immensely tedious.
The idea is this: The cannister is loaded with heavy KCl chunks, and suspended from the lid of the bucket with a 1" PVC bulkhead adapter. Hot electrolyte circulates through all the holes and gets resaturated with chloride. No solid KCl gets out through the holes. If it does, it should dissolve as the Cl- level drops.
- MadMat likes this
Posted 23 September 2012 - 03:26 PM
It does occupy volume, but the density of Cl- in this cannister is going to be at least 3X to 5X more than liquid, saturated electrolyte. We'll found out if it's worth the trouble. If, after a week or two, the amount of KCl dissolved from this thing is small, then it's not worth pursuing. If it all dissolves in 3 days, it can be recharged on the fly with MORE solid KCl, in theory repeating until the bucket is nearly packed with chlorate solid. And if THAT is the case, the system would beg for a tall bucket, with a lot of space at the bottom for solid KClO3.
Along with that device, I set myself up with some cool HDPE barrels. Previously, I had 15 to 20 gallons of various used electrolytes sitting in a corner of my shop. This was messy, and a hazard. These will all be replaced with one barrel, which I will layer with maybe a foot of solid KCl. Everything used ends up in there for recycling.
I tested one with H2O, and as expected, it weighs more than I can lift. And unless you'd want a motorized or crank pump, siphon is the only way to empty it. Therefore, this thing will need to be elevated before filling (on a stand of some sort), and a simple siphon pump obtained, like this:
Along with the pump and the barrels, I picked up some stuff from U.S. Plastics - some bulkhead fittings, barrel plugs and spouts, and importantly, a polymer barrel bung wrench. These things simply cannot be tightened or loosened without one.
These are resting in a 5 gallon pail sieve - I cannot think of a better tool for harvesting and washing multi-kilo batches of heavy wet xtals. These are inexpensive, just a few bucks each.
So... conclusion for now - The bucket cell is ready to go. I am working on calibrating the HCl "hospital IV" drip, as the drip does TWO things... obviously, it works on pH, but it must simultaneously form at least part of a top-off system. The ideal solution would have the acid water doing both, and the liquid level in the bucket remains close to where it needs to be.
The amount of liquid lost to evaporation and redox gas evolution is going to vary with temperature, and current, and I'd like to get an idea of what that's going to be during this run.
- joncammarata likes this
Posted 23 September 2012 - 03:31 PM
Length of run calculations are based purely on volume of the cell, and current. The starting chloride is assumed to be 25 C saturated KCl, which is around 15% Cl- by weight. And the ending Cl- is arbitrary. I normally use 6% Cl-.
If I make use of the KCl cannister, it is going to skew the calculations badly. I can always use actual Cl- quantitative methods to track it, but the idea behind this system was simplicity. No annoying tests.
Hmmm... I may have to do a run without the cannister, then try one with it, and note the difference.
I added another couple of low-tech gadgets to the bucket cell, which I'll show later. This will be fun! I haven't electrolyzed much if at all in a long time!
Posted 23 September 2012 - 04:47 PM
Good job, Swede!
Posted 23 September 2012 - 07:42 PM
Posted 24 September 2012 - 12:04 AM
Posted 24 September 2012 - 12:40 AM
The sky is my canvas, and I have 2,113 pounds of powdered paint in the workshop.
Posted 24 September 2012 - 07:55 PM
Posted 24 September 2012 - 08:58 PM
The ability for a amateur to create his own materials( which may not be able to obtain due to location) is great . Your posting on a "pyro forum" not some knewl bomber site with kids asking how to make AP and other things that go boom. This is a site where pyros take their hobbies to the next level, and or get their questions answered.
There is a absolute need for kclo3 for many comps, in which no other oxidizer will suffice. SO the ability for one to source this valuable material is crucial.
This however is not the main focus of this project. This is a electrochemistry project. It just so happens that the final product is a oxidizer that recieves lots of crap , due to misuse from foolish people.
As said, we are all learning, and if one can learn to become "self-sustained" , it is a good thing. If some kids want to learn how to make illegal/dangerous stuff , they will go to other sites for info. We cant stop that nonsense.
SO lets get back on topic : making a bucket cell.
Thank you for the hard work you have been putting into this project. It is a worthy topic, and one that deserves attention of its own . I like the round plate for the BCA that WSM suggested. It makes more sense and the simplicity is nice. There is much to be said about a cheap obtainable system, which uses cheap buckets that are simple to modify, and replaceable when things get worn out.
Edited by pyrojig, 24 September 2012 - 09:00 PM.
Posted 24 September 2012 - 09:29 PM
Posted 25 September 2012 - 04:37 AM
When I first read the topic, I thought it meant a cell that I would build before I die...
Thanks to the efforts of Swede, you don't have to spend years ironing out the kinks of this project. All the information you need to do this is here, and if you can source the materials it isn't terribly hard to make. If you think it will take a lifetime to build, maybe you shouldn't attempt the project. Otherwise please don't try to derail the thread
- Hoppy likes this
Posted 25 September 2012 - 10:48 AM
Addressing the extra kcl though calculations and years of synthesizes i have found that the optimal amount of kcl(for efficiency) is 580 g/l. That will yield respectfully 836 g/l. heat your water and add the kcl what ever is dissolved will dissolve as the reaction continues
I totally agree and understand that KCl solubility is limited. Heating the electrolyte before powering on works very well. But not everyone has the ability to heat 25 liters of electrolyte, and by starting at a typical room temperature saturated solution, we know how much chloride is in there without doing a Cl- quantitative test. And you are probably very correct that excess KCl solids in the liquor will dissolve as the process continues, I'd personally rather keep the solids separate, so if someone dips in there to gather solids, it'll be 100% chlorate. With a cannister, we can eyeball what's going on in there.
This isn't cutting edge, it's not supposed to be. Anyway, my internet connection dumped all day yesterday, so I'm playing catch-up a bit. I'll try to get more stuff up. It's not powered on yet, but hopefully will be soon. I'm also in the middle of a massive shop and lab clean up. With fall finally here, my work area is now down to 100 F. rather than 130 F. Seriously, those are real numbers. There's something about the structure (metal. facing South) and the hideous Texas heat, that combines to make it useless for 5 months a year.
Posted 25 September 2012 - 01:13 PM
Do you have a link for that pail sieve? The only one I could find (for beer) was $10.00.
@Pyroshell, I don' know what the tirade you posted was all about but frankly, with only 5 posts yourself and with Swede's 1700 plus posts, YOU could be the k3wl b00m3rz and we would not know. Try a little respect here and be part of a solution (irony not lost on me) to the yield problem (preheating was a good catch) and not be so critical.
Hell, I don't know a darn thing about this stuff but I have a better understanding every time one of these fantastic guys posts another tut and writes about their experiences here.
PGI Member http://www.pgi.org
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"The art of fire is indeed the supreme art; for fire is at once the universal slave, the universal master."
Posted 25 September 2012 - 05:17 PM
Do you have a link for that pail sieve? The only one I could find (for beer) was $10.00.
Hopes this helps. At e-Bay I found 5 gal. bucket filters for bio-diesel but the cost was at $ 10.50 and up. My quest is that the mesh size has a lot to do with.
Speaking of mesh size what would be the best size for filtering. If it is to small will it plug up and slow way down to a stop.
And as for Pyroshell I just about quit trying to tell others of the need to research the complete forum. If only they would they would find so much information as to what is easy to find that would help them to understand things. As for the kewls, well there is not much we can do about them but try to guide them in the right direction.
For most set ups that produce chlorate, it the smell that gives them a way and if not done right then there is the salt damages that show up.
@Pyroshell do lots of reading on the forum here it will help you if your interest lies in chlorate production........Pat
Edited by patsroom, 25 September 2012 - 05:18 PM.
Posted 25 September 2012 - 07:49 PM
People said MMO electrodes allow me to make perchlorates, but others said they're only good for chlorates. Plenty of materials are good for chlorates, heck even battery carbon electrode is good for that.
So the only material good for perchlorate production is platinum? Would it be possible to simply take apart a car catalytic converter? What about gold, would that be good for perchlorate production too? I heard of lead dioxide, how does that work?
Edited by taiwanluthiers, 25 September 2012 - 07:50 PM.
Posted 25 September 2012 - 09:35 PM
Posted 25 September 2012 - 09:40 PM
There are only a few materials that works for producing perchlorate that are usable for the amatures and they have all been discussed in other topics on the forum. We truly need not to clog up this topic but to allow Swede to develop this writing into the direction that he wishes for all of us to get the best out of this one.
Below is one place that you can look to find some information that you are looking for:
http://www.geocities...e/chlorate.html and I think that for the time being this question should have been addressed to the making potassium (per) chlorate section in the forum. I know that you have been there but if you had read it from start to finish, Swedes blog you'll poke you eye out and the rest of the sites located in the APC forum that deal with the production of prechlorate you would have found most of your answers. Your questions are important and the do deserve to be answered but your first step is to do your homework then if something fails to make sense that would be the time to ask.
I hope that it helps you.......Pat
Edited by patsroom, 25 September 2012 - 10:42 PM.
Posted 25 September 2012 - 11:35 PM
It seems Lead Dioxide is the best bet, but where does one obtain lead dioxide anode? I read in there that it needed special process to plate it on, but ebay doesn't sell lead dioxide as anode material (only as powder)
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